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Service Manual

MRCOOL GeoCool 48K BTU 4T Multi Positional 230V 1-Phase 60Hz DC Invert

User Manual for MRCOOL models including: 48K BTU 4T GeoCool 4T Multi Positional 230V 1 Phase 60Hz DC Invert, 48K BTU 4T, GeoCool 4T Multi Positional 230V 1 Phase 60Hz DC Invert, 230V 1 Phase 60Hz DC Invert, 60Hz DC Invert, Invert

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Document DEVICE REPORTmc-geocool-service-manual
GeoCool® DC Inverter Geothermal Heat Pump
SERVICE MANUAL
Version Date: 09/15/23
Capacity: 48kBtu/h 60kBtu/h Rate Frequency: 60Hz Operating Range:
Cooling: 44.6°F (7°C) ~107.6°F (42°C) Heating: 21.2°F (-6°C) ~89.6°F (32°C)

Foreword
Thank you for choosing this product. In order to correctly install and use our units, and for the satisfactory operation effect, please read this manual carefully.
This manual specifies safe operation requirements from perspectives of product introduction, control, troubleshooting and maintenance, as well as basic principles and implementation methods. Professional operators must abide by relevant national (local) safety requirements and technical specifications set forth in this manual during operations; otherwise, the product system may fail or be damaged, and personnel safety accident may also occur.
Safety Notice
Before using this product, please first read the instruction manual.
Before installing this product, please first read the instruction manual.
Before repairing this product, please first read the technical service manual.

CONTENTS
Safety Notice on Maintenance ................................................. 1 Safety Notice on Operation ................................................... 2 1 Product Introduction ....................................................... 3
1.1 Lists of Units .................................................................... 3 1.2 Electrical Parameters ............................................................. 4 2 Control Mode .............................................................. 4 2.1 Based Control ................................................................... 4 2.2 Special Control .................................................................. 5 3 Functions ................................................................. 7 3.1 Dip Switch Setting of Compressor Module ........................................... 7 3.2 Dip Switch Setting of A-Coil Module ................................................ 7 3.3 Refrigerant Recovery ............................................................. 9 3.4 Water Pump Start-up Function ..................................................... 9 4 Power Distribution ........................................................ 10 4.1 Diagram of Power Distribution .................................................... 10 4.2 Wiring Diagrams ................................................................ 10 4.3 PCB Layout .................................................................... 13 4.4 Error Code ..................................................................... 17 4.4 Troubleshooting ................................................................ 18 4.5 Failures Not Caused by Errors .................................................... 44 5 Maintenance .............................................................. 46 5.1 System Diagram ................................................................ 46 5.2 Connection Pipe Vacuum Pumping ................................................ 46 5.3 Refrigerant Charging ............................................................ 48 5.4 Maintenance of Major Components................................................ 50 5.5 Removal of Major Components ................................................... 58 5.6 Explosive View and Lists of Parts ................................................. 88 5 COMMON PARAMETER LISTS .............................................. 97 5.1 Temperature/Pressure List of Refrigerant........................................... 97 5.2 Resistance / Temperature Lists of Temperature Sensors.............................. 98 6 Operation Tools .......................................................... 104

MRCOOL®
Safety Notice on Maintenance

DC INVERTER GEOTHERMAL HEAT PUMP

PROHIBITED
(1) Do not pierce or burn. (2) Please note that refrigerant may be odorless. (3) The appliance shall be stored in a room without continuously operating ignition sources (For example:
open flames, an operating gas appliance or an operating electric heater). (4) The installation method is the same with the common joints. However, because the joint can't be detached,
if it is badly connected and causes leakage, it needs to be cut and replaced by a new one through welding. (5) Using unsuitable parts or tools may lead to electric shock or fire hazard. (6) If refrigerant leaks during maintenance, please ventilate the room immediately. Heavy leakage may lead to
breathing difficulty, severe injury or death. (7) Disconnect power before disassembling the appliance for maintenance. (8) The appliance should be maintained and cared by authorized technical personnel with necessary
qualifications.
WARNING: (1) If the working place is more than 6.5 ft (2m's) high, please wear a safety helmet, gloves and a safety belt. (2) Never mix any other substances except the specified refrigerant into the refrigerant circuit. (3) When re-locating the appliance, check whether the new location is strong enough to withstand the weight
of the appliance. (4) If there is refrigerant leak, please fix the leak before charging in the refrigerant. After refrigerant is charged,
check for refrigerant leaks. If you cannot spot the leak, stop the maintenance work. Please evacuate the system and close the service valve to prevent refrigerant leaking into the room. (5) Prepare suitable tools and protectors. (6) If you need to carry out maintenance or check the electric circuit without cutting off the power, please be careful not to touch the electrical parts. NOTICE: (1) If the appliance is maintained at a humid place, it should be grounded to avoid electric shock. (2) Never repair the unit with wet hands. Operating the unit with wet hands may lead to electric shock. (3) If the unit is not correctly grounded, please check and fix it. (4) Before cleaning the unit, please disconnect power to prevent the inner fan from starting up and running at high speed; Otherwise personal injury may occur.
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MRCOOL®

DC INVERTER GEOTHERMAL HEAT PUMP

(5) Measure the insulation resistance after maintenance. The resistance must be 3 ft (1M or higher. Bad insulation may lead to electric shock.
(6) Welding and cutting work must be done in a well-ventilated place. (7) Gas appliances, heaters and other fire sources should be kept away from the installation and maintenance
site. (8) Maintenance should be done according to suggestions of the manufacturer.

(9) Maintenance should be done only after the refrigerant is completely reclaimed from the unit.

OBSERVED (1) After the maintenance work is done, check the drainage of A-Coil Module. (2) Do not tilt the unit, otherwise, water may spill out from the unit and make the floor and furniture wet. (3) Disassembly of the unit, handling of the refrigerant, oil and accessories should all be done according to
applicable local rules and regulations.

Safety Notice on Operation

PROHIBITED: (1) Never try to modify the unit, otherwise, it may cause electric shock, overheat or fire hazard. (2) If the power cord or conducting wires are scratched, please replace them. (3) Never use connected or extended power cord or share the power socket with other appliances. (4) Prepare a specialized power circuit for the appliance.
WARNING: (1) If the power plug is dirty, please clean it before inserting it to the power socket. If the power plug is loose,
please tight it up. (2) Do not damage the power cord. A damaged or refitted power cord may lead to electric shock or fire hazard. (3) Check frequently whether the appliance is in good condition.
NOTICE: (1) Do not use organic solvents to wipe the controller operating panel. (2) Before cleaning the unit, cut off the power supply.

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DC INVERTER GEOTHERMAL HEAT PUMP

1 Product Introduction

1.1 Lists of Units

1.1.1 List of Compressor Module

Model

Power Supply V/Ph/Hz

Cooling/Heating Capacity (Btu/h)

Finished Product Code

Appearance

GCSHPM060IN GCSHPM048IN

62000/55000

ES80100010

208/230V-1Ph-60Hz

50500/48000

ES80100020

1.1.2 List of A-Coil Module

Model

Power Supply V/Ph/Hz

Cooling/Heating Capacity (Btu/h)

Finished Product Code

Appearance

GCSCAM060GN GCSCAM048GN

62000/55000

ES82000010

208/230V-1Ph-60Hz

50500/48000

ES82000020

NOTE: 1 Ton =12000Btu/h = 3.517kW
1.1.3 List of Blower Module
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Model GCSBLM014
GCSBLM013

Power Supply V/Ph/Hz

DC INVERTER GEOTHERMAL HEAT PUMP

Airflow (CFM)

Finished Product Code

Appearance

208/230V-1Ph-60Hz

1400 1400

ES81000010 ES81000020

1.2 Electrical Parameters

Model
GCSHPM048IN GCSHPM060IN

Power supply V/Ph/Hz
208/230V-1Ph-60Hz

Model
GCSCAM048GN GCSCAM060GN

Power Supply V/Ph/Hz
208/230V-1Ph-60Hz

Fuse Capacity A
3.15
Fuse Capacity A 5

Circuit breaker capacity A 35
Circuit Breaker Capacity A 15

2 Control Mode
2.1 Based Control
2.1.1 Compressor Control
When cooling or heating mode is turned on, the fan of Blower module will run for a while before the compressor starts. Under different modes, the compressor can only be stopped after running for some time (special cases excluded). This is to protect the compressor from frequent start or stop. Once the compressor is stopped, it must not be restarted right away. Please wait for a few minutes.
2.1.2 EEV Control
When the unit is first started, the electronic expansion valve will reset control. During the process, the expansion valve will produce rattling sound. When cooling or heating mode is turned on, the valve will be open at a certain step before the compressor starts.
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2.1.3 4-way Valve Control

DC INVERTER GEOTHERMAL HEAT PUMP

After heating mode is turned on for a while, 4-way valve will be energized to change the direction of refrigerant flow so that the system can run in heating. Under other modes, the valve will not be energized.
To avoid the 4-way valve from incorrectly changing directions, when the unit stops in heating, due to a temperature point or other protection reasons, the 4-way valve will continue to energized temporarily and lose power after a while.
There must be enough pressure difference between the condensing and evaporation pressure for the 4-way valve before changing directions.

2.2 Special Control

2.2.1 Oil Return Control

If the unit is running at low frequency for a long time, oil return control is needed to let the oil in the pipeline back to the compressor. Generally, this control will take 4~6min. The compressor frequency will be raised.

2.2.1 High-Pressure Protection
If the high pressure switch of the unit is detected to trip at 4.2MPa or if the high pressure temperature measured by high pressure sensor exceeds 149°F (65) for a period of time, the mainboard display screen will display error code "E1" and the unit will shut down. High-Pressure Protection can be cleared by manually powering off the unit. The reset pressure of the high pressure switch is 3.6MPa.

2.2.3 Low Pressure Protection Control
There are two low pressure switches for the unit. One is for ground water application designed to trip at 0.25MPa (reset at 0.3MPa), the other is for ground-loop application designed to trip at 0.1Mpa (reset at 0.2MPa).
When the low pressure switch is detected to trip for a period of time, the unit will shut down and the mainboard display screen will display error code E3. The unit will restart when the low pressure switch has reset within a few minutes. If low pressure protection occurs for several times in a short time, the unit will not restart automatically. You need to restart the unit manually.
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DC INVERTER GEOTHERMAL HEAT PUMP

2.2.4 High Discharge Temperature Protection

If the discharge temperature of the unit is detected to be higher than 230°F (110) for a period of time, the unit shuts down and displays error code "E4" on the main board display screen. When it is detected that the discharge temperature of the unit is less than the 194°F (90) for a period of time, the error will be cleared and the unit will restart. If High Discharge Temperature Protection occurs multiple times within a certain period of time, the error cannot be automatically cleared and need to be cleared manually by powering off the unit.

2.2.5 Anti-Freezing Protection
Under cooling mode, if the temperature of the evaporator (measured by the in-tube temperature sensor) is detected to be lower than the limit value for a continuous period of time, the evaporator is at risk of frosting, the unit will enter Anti-Freezing Protection and shut down. If the temperature of the evaporator is detected to be higher than the relating value for a period of time, the unit will restart. If the anti-freezing protection occurs multiple times during a period of time in the cooling mode, the unit will stop and the error code "E2" will be displayed on the main board display screen and the error need to be cleared by manually powering off the unit.
For ground water application, if the compressor is not operating and the inlet or outlet water temperature of the Compressor module is below 33.8°F (1), water valve will open and the water pump will start to circulate the water in the water loop. The error code "E2" will display on the main board display screen. If the water temperature is higher than 41°F (5) for a period of time, the anti-freezing protection will be cleared. The water pump will shut down and water valve will close.

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DC INVERTER GEOTHERMAL HEAT PUMP

3 Functions

3.1 Dip Switch Setting of Compressor Module

3.1.1 Geothermal Mode Setting

The geothermal application of the unit can be set through the second dip switch SA2 on the mainboard of

the Compressor module. The specific definitions of the dip switch are as follows.

Model

Geothermal Application

Dip switches of Compressor Module

GCSHPM048IN

Ground Water (Default)

GCSHPM060IN

Ground Loop

3.2 Dip Switch Setting of A-Coil Module

3.2.1 Fan Speed Setting

Set the fan speed through the dip switch SA1 of the A-Coil Module mainboard and you can change the fan speed by the first dip switch of the SA1. For the automatic adjustment control, the fan speed will change according to the temperature of return air temperature. For fixed speed control, the fan will run at a certain level. The specific definition of the dip switch is as follows.

Model

DIP Switch

Speed Control

Dip switches of A-Coil Module

Automatic

GCSCAM048GN The first dip switch Adjustment Control

GCSCAM060GN

of the SA1

Fixed Speed Control

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MRCOOL®
Model

Dip Switch

DC INVERTER GEOTHERMAL HEAT PUMP

Fan Speed

Dip switches of A-Coil Module

Level 1

Level 2

GCSCAM048GN

Level 3

SA1

GCSCAM060GN

(Default)

Level 4

Level 5

3.2.2 Supply Air Direction Setting
The supply air direction of the unit need to be set through the second dip switch of SA2 on the mainboard of the A-Coil module according to the installation of the unit. The specific definition of the dip switch is as follows.

Model

Air flow directions

Dip switches of A-Coil Module

GCSCAM048GN

Vertical Upflow/
Horizontal Return Air Default

GCSCAM060GN

Vertical Downflow

NOTE:  During installation and debugging, pay attention to check whether the thermostat has set the fan delay and
shutdown time. The actual delay and shutdown time of the fan depends on the setting of the thermostat.

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MRCOOL®
3.3 Refrigerant Recovery

DC INVERTER GEOTHERMAL HEAT PUMP

This function is part of the debugging function. It is only used for the situation that the unit would be removed to another place and the refrigerant need to be recovered to the unit from the pipelines.
When the unit is shut down, the debugging function can be enabled by the operation of SW1-3. 1. Press and hold "SW1" for about 5 seconds to enter the first level menu of debug menu. 2. Under the first level menu, press and hold "SW1" for about 5 seconds to switch to the number "08". 3. Press and hold "SW2" or "SW3" for about 5 seconds to enter the control mode. "ON" means on, and "OF" means off. 4. Press and hold "SW1" for about 5 seconds to save. Notes: When operating by pressing SW1~3, please maintain the button operation until the display screen changes. During debugging function, if no operation is performed within 10s, the debug menu interface will exit.

3.4 Water Pump Start-up Function

This function is part of the debugging function. It is used for evacuating the air from the water pipeline for the installation or maintenance of the water system. The water pump start-up function needs to be operated when the unit is powered on, and must be operated by a professional. The water or antifreeze solution need to be added at the same time.
When the unit is shut down, the debugging function can be enabled by the operation of SW1-3. 1. Press and hold "SW1" for about 5 seconds to enter the first-level menu of the debugging mode. 2. In the first-level menu, press and hold "SW1" for about 5 seconds to switch to the number "03". 3. Press and hold "SW2" or "SW3" for about 5 seconds to enter the control mode, "ON" means open, "OF" means off. 4. Press and hold "SW1" for about 5 seconds to save. Notes: When operating by pressing SW1~3, please keep pressing the keys until the display changes. In this mode, the Water Flow Switch Protection is set to be reserved. If no air discharges from the discharge valve in the water system, the air can be regarded as fully evacuation. During debugging function, if no operation is performed within 10s, the debug menu interface will exit. The limit time of this function is 30min. It will automatically exit and shut down the water pump.

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MRCOOL®
4 Power Distribution 4.1 Diagram of Power Distribution

DC INVERTER GEOTHERMAL HEAT PUMP

Power supply

Power supply

Air switch

Compressor

Filter board

Main board of Compressor Module

Air switch

Main board of A-Coil Module

A-Coil Module and Blower Module

Control signal of temperature sensor, 4-way valve, electronic expansion valve, high and low
pressure switch, etc.

Control signal of temperature sensor, electronic expansion
valve, fan, etc.

(The red line represents power line while black line represents the control line.)
4.2 Wiring Diagrams

The following electric diagram is for reference only. Please refer to diagram stuck on the unit as the latest version.

4.2.1 Wiring Diagrams of Compressor Module

Model: GCSHPM048IN / GCSHPM060IN

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DC INVERTER GEOTHERMAL HEAT PUMP

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MRCOOL®
4.2.2 Wiring Diagrams of A-Coil Module
Model: GCSCAM048GN / GCSCAM060GN

DC INVERTER GEOTHERMAL HEAT PUMP

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MRCOOL®
4.3 PCB Layout

4.3.1 Interface

A-Coil Module

Model: GCSCAM048GN / GCSCAM060GN

1

2

22 21 20
19

DC INVERTER GEOTHERMAL HEAT PUMP

3456 7 8

9

10 11

12

Mainboard

No.

Printing

1

FAN_C

2

JTAG

3

AC_N2

4

AC_N3

18

17

16

15

Terminal

No.

Motor control signal 12
terminal

Program terminal

13

Reserved

14

Reserved

15

Printing
E AC_N AC_L
EV

5

AC_N4

Reserved

16

CN485_1

6

AC_N5

Reserved

17

7

FAN_L

Motor live wire input

18

Transformer live wire input

8

AC_L1

230V

19

Transformer neutral wire

9

AC_N1

20

input

10

FAN_N

Motor neutral wire input

21

Transformer live wire input

11

TC_AC208

22

208V

13

CN485 T-CN2 CN1 AC24_N CN-T AC24_L

14 13
Terminal
Ground wire terminal Neutral wire input Live wire input
Electronic expansion valve terminal
485 Wired control communication
interface(Reserved) 485 Wired control communication interface
Thermal pack interface
Thermostat control signal terminal
Transformer neutral wire output
AC 24V
Transformer live wire output

MRCOOL® Compressor Module Model: GCSHPM048IN / GCSHPM060IN
Mainboard

DC INVERTER GEOTHERMAL HEAT PUMP

No.

Printing

1

AC-L

3

J3

JTAG2

JTAG1 5
JTAG3

JTAG4

7

T-SENSOR1

Terminal

No.

Live wire input

2

Reserved

4

Wiring terminal

6

1-2. Water inlet temperature sensor

8

14

Printing
AC-N COMP CN485-A1 CN485-A2 CN485-B1 CN485-B2 T_SENSOR3

Terminal Neutral wire input Compressor output
RS485 communication terminal
1-2. Suction temperature sensor

MRCOOL®

No.

Printing

Terminal

No.

terminal

3-4. Water outlet temperature sensor

terminal

5-6. Liquid pipe temperature sensor

terminal

9 T_SENSOR2

Reserved

10

11

IN-SW1

Water flow switch

12

13

H-PRESS

High pressure sensor terminal

14

15

LPP2

System low pressure protection 16
terminal

17

HPP2

System high pressure protection 18
terminal

19 WATER_PUMP

Reserved

20

21

PUMP-N

Water pump neutral wire input

22

23

CN13

5V DC power supply output

Filtering Board:

Model: GCSHPM048IN / GCSHPM060IN

DC INVERTER GEOTHERMAL HEAT PUMP

Printing

Terminal
terminal 3-4. Discharge temperature sensor
terminal

FA1 CN12 HPP2
LPP1
FAN1 PUMP-L
4WAY

Electronic expansion valve terminal 5V DC power supply input
System high pressure protection terminal
System low pressure protection terminal
Fan terminal
Water pump live wire input 4-way valve

No. Printing

1

N-OUT

3

N

5

L-OUT

Terminal Power output neutral wire terminal Power input neutral wire terminal
Power output live wire terminal

No. Printing

2

PE

4

AC-L

Terminal Filtering board ground wire terminal
Power input live wire terminal

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MRCOOL®

DC INVERTER GEOTHERMAL HEAT PUMP

4.3.2 IPM, PFC Testing Method

4.3.2.1Method of Testing IPM Module

(1) Preparation before test: prepare a universal meter and turn to its diode option, and then remove the wires U, V, W of the compressor after it is powered off for one minute.
(2) Testing Step Step 1: put the black probe on the place P and the red one on the wiring terminal U, V, W respectively as
shown in the following figure to measure the voltage between UP, VP and WP. Step 2: put the red probe on the place GND and the black one on the wiring terminal U, V, W respectively as
shown in the following figure to measure the voltage between NU, NV and NW. (3) If the measured voltages between UP, VP, WP, NU, NV, NV are all among 0.3V-0.7V, then it indicates the IPM module is normal; If any measured valve is 0, it indicates the IPM is damaged.
3.3.2.2 Method of Testing PFC Module Short Circuit

(1) Preparation before testing: Prepare a multimeter, then turn it on to the DC voltage mode. After powering off for 20 minutes, remove the AC-L and N wires.
(2) Connect the red probe of the multimeter to P and the black probe to GND, confirm that the voltage is less than 10V, and then turn the multimeter on to the diode position.
(3) Place the black probe at point P, and the red probe at points D8-2, D5-2, and D2-2, respectively. Then measure the voltage between D8-2, D5-2, and D2-2 to P. If the voltage between D8-2 and P, D5-2 and P, D2-2 and P is between 0.3 and 0.7V, it indicates that diodes D8, D5, and D2 in the PFC circuit are normal. If the measured value is 0, the PFC circuit is damaged.
(4) Place the red probe at the GND point and the black probe at Q9-2, Q10-2, and Q11-2, respectively, to measure the voltage between GND point and Q9-2, Q10-2, and Q11-2. If the voltage value between GND point and Q9-2, Q10-2, and Q11-2 is between 0.3 and 0.7V, it indicates that the MOS tubes Q9, Q10, and Q11 in the PFC circuit are normal. If the measured value is 0, the PFC circuit is damaged.

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MRCOOL® GCSHPM048IN / GCSHPM060IN

DC INVERTER GEOTHERMAL HEAT PUMP

4.4 Error Code

If error occurs during operation, LCD temperature display screen will show the error information. If several errors occur at the same time, their corresponding error codes will be shown in turn. When error occurs, please shut off the unit and send for professional personnel to repair. For example, E1 (as shown below) indicates high pressure protection.

No.

Error code

Error

1

E1

High-Pressure Protection

2

E2

Anti-Freezing Protection

3

E3

Low-Pressure Protection

4

E4

High Discharge Temperature Protection

5

EC

Water Flow Switch Protection

6

C6

Discharge Temperature Sensor Error

7

dc

Suction Temperature Sensor Error

8

FB

Water Inlet Temperature Sensor Error

9

FM

Water Outlet temperature Sensor Error

10

A7

Liquid Pipe Temperature Sensor Error

11

E0

Fan Error

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MRCOOL®

No.

Error code

12

C2

13

Cb

14

C1

15

E6

16

LF

17

E5

18

H5

19

HC

20

P8

21

PL

22

PH

23

PU

24

C9

25

H3

26

LP

DC INVERTER GEOTHERMAL HEAT PUMP
Error
In-Tube Temperature Sensor Error Gas Pipe Temperature Sensor Error Return Air Temperature Sensor Error Communication Error Power Protection Current Protection IPM Protection PFC Protection High Driver Module Temperature Protection DC Bus Under-Voltage Protection or DC Bus Voltage Drop Error DC Bus Over-Voltage Protection Charging Circuit Error Chip Error High-Pressure Sensor Error Capacity DIP Switch Setting Error

4.4 Troubleshooting
4.4.1 "E1" High-Pressure Protection
Error display: Compressor Module mainboard LED display screen Error judgment condition and method: If the high pressure switch of the unit is detected to trip at 4.2MPa or if the high pressure temperature measured by high pressure sensor exceeds 65 for a period of time, the mainboard display screen will display error code "E1" and the unit will shut down. High-Pressure Protection can be cleared by manually powering off the unit. The reset pressure of the high pressure switch is 3.6MPa. Possible reason Cut-off valve of Compressor module or A-Coil module is not fully opened; High-pressure switch or high pressure sensor is abnormal; Fan of Blower module is not working properly; Filter or air duct is blocked (heating mode); Refrigerant charging amount is too much; System pipeline is blocked
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MRCOOL®
Troubleshooting Heating Mode:

DC INVERTER GEOTHERMAL HEAT PUMP

High pressure protection in heating mode
Check the pressure with a manometer: is it
really high? Yes
Check work mode of A-Coil module:
does it properly set?
Yes
Check the cut-off valves: are they open?
Yes
Check the flow of the inlet/outlet: is
it blocked?
Yes
Check the fan of Blower module :
is it run?
Yes

No Replace the Compressor

module mainboard

No

Check the pressure switch :is it
normal?

Yes

Check the

Yes

high pressure sensor: is

it normal?

Replace the high pressure sensor

No Replace the pressure

No Refer to Instruction Manual

switch

and make it properly set

No Completely open the valve

No Remove the barrier

No Measure the fan motor and signal input

Check the filter and heat exchange fin: is there filth
dirty or block?
No
Refrigerant pipe is blocked

Yes Refer to Maintenance
Mainly check the refrigerant pipe, filter, capillary and so on.

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DC INVERTER GEOTHERMAL HEAT PUMP

Cooling Mode:

High pressure protection in cooling mode
Check the pressure with a manometer: is it
really high?
Yes
Check work mode of A-Coil module:
does it properly set?

No Replace the Compressor module mainboard

No

Check the pressure switch :is it
normal?

Yes

Check the

Yes

high pressure sensor: is

it normal?

Replace the high pressure sensor

No Replace the pressure

No Refer to Instruction Manual

switch

and make it properly set

Yes

Check the cut-off valves: are they open?

No Completely open the valve

Yes

Check the water pump: dose it properly

No

work?

No Connect the water pump wires correctly

Check if water

Yes

pump wires are correctly

connected ?

Replace the water pump

Yes
Check the water flow rate: is it within
normal range?

No Change the valve to make water flow rate within normal range

Yes

Check the co-axial heat exchanger : is it filth blockage?
No
Refrigerant pipe is blocked

Yes Refer to Maintenance
Mainly check the refrigerant pipe, filter, capillary and so on.

4.4.2 "E2" Anti-Freeze Protection

Error display: Compressor Module mainboard LED display screen Error judgment condition and method: Under cooling mode, if the temperature of the evaporator (measured by the in-tube temperature sensor) is detected to be lower than the limit value for a continuous period of time, the evaporator is at risk of frosting, the unit will enter Anti-Freezing Protection and shut down. If the temperature of the evaporator is detected to be higher than the relating value for a period of time, the unit will restart. If the anti-freezing protection occurs multiple times during a period of time in the cooling mode, the unit will stop and the error code "E2" will be displayed on the main board display screen and the error need to be cleared by manually powering off the unit. For ground water application, if the compressor is not operating and the inlet or outlet water temperature of the Compressor module is below 33.8°F (1), water valve will open and the water pump will start to circulate the water in the water loop. The error code "E2" will display on the main board display screen. If the water temperature is higher than 41°F (5) for a period of time, the anti-freezing protection will be cleared. The water pump will shut down and water valve will close.
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MRCOOL® Possible reason Water inlet temperature is too low;
Fan of Blower module is not working properly;

DC INVERTER GEOTHERMAL HEAT PUMP

Troubleshooting

Anti-Freezing Protection Yes

Yes Normal protection,adjust the water temperature

Check the compressor is turned off
before error, is it ?

Yes

Check the water temperature is lower than

1 Celsius degrees

:is it?

No
Check the in-tube temperature or gas temperature is lower than 5
Celsius degrees :is it?

No Check the main board

Yes

No Check the main board

Check the fan of Blower module: is it properly
work?
Yes

No Check the motor

Check the return air temperature: is it too low?

Yes Normal protection

No
Check the heat exchanger of A-Coil module: is it filth
blockage?

Yes Refer to Care and Maintenance

No Check the main board

4.4.3 "E3" Low-Pressure Protection
Error display: Compressor Module mainboard LED display screen Error judgment condition and method: There are two low pressure switches for the unit. One is for ground water application designed to trip at 0.25MPa (reset at 0.3MPa), the other is for ground-loop application designed to trip at 0.1Mpa (reset at 0.2MPa). When the low pressure switch is detected to trip for a period of time, the unit will shut down and the mainboard display screen will display error code E3. The unit will restart when the low pressure switch has reset within a few minutes. If low pressure protection occurs for several times in a short time, the unit will not restart automatically. You need to restart the unit manually.
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Possible reason Cut-off valve of Compressor module or A-Coil module is not fully opened;

Dip switch of geothermal application on compressor module mainboard is wrong; Low-pressure switch is abnormal; Fan of Blower module is not working properly;

Filter or air duct is blocked (cooling mode); Refrigerant charging amount is insufficient; System pipeline is blocked;

Refrigerant leakage Troubleshooting Cooling Mode

Low pressure protection in cooling mode
Check the pressure with a manometer: is it
really high? Yes
Check work mode of A-Coil module:
is it properly set?
Yes
Check the cut-off valves: are they open?
Yes
Check the flow of the inlet/outlet: is
it blocked?
Yes
Check the fan of Blower module :
is it run?
Yes

No Replace the Compressor module mainboard

No

Check the

Yes

high pressure sensor: is

it normal?

Replace the high pressure sensor

No Refer to Instruction Manual and make it properly set

No Completely open the valve

No Remove the barrier

No Measure the fan motor and signal input

Check the filter and heat

Yes

exchange fin: is there dirty

or block?

No

Check and repair the leakage of the unit. Charge refrigerant according to the required volume

Refer to Maintenance

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MRCOOL® Heating Mode

DC INVERTER GEOTHERMAL HEAT PUMP

Low pressure protection in heating mode
Check the pressure with a manometer: is it
really high?
Yes
Check work mode of A-Coil module:
is it properly set?
Yes
Check the cut-off valves: are they open?
Yes
Check the water pump: does it properly
work?
Yes
Check the water flow rate: is it within
normal range?

No Replace the Compressor module mainboard

No

Check the

Yes

high pressure sensor: is

it normal?

Replace the high pressure sensor

No Refer to Instruction Manual and make it properly set

No Completely open the valve

No Connect the water pump wires correctly

No

Check if water

Yes

pump wires are correctly

connected ?

Replace the water pump

No Change the valve to make water flow rate within normal range

Yes

Check the co-axial heat exchanger : is it filth blockage?

Yes Refer to Maintenance

No
Check and repair the leakage of the unit. Charge refrigerant according to the required volume

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4.4.4 "E4" High Discharge Temperature Protection

Error display: Compressor Module mainboard LED display screen Error judgment condition and method: If the discharge temperature of the unit is detected to be higher than 230°F (110) for a period of time, the unit shuts down and displays error code "E4" on the main board display screen. When it is detected that the discharge temperature of the unit is less than the 194°F (90) for a period of time, the error will be cleared and the unit will restart. If High Discharge Temperature Protection occurs multiple times within a certain period of time, the error cannot be automatically cleared and need to be cleared manually by powering off the unit.
Possible reason Cut-off valve of Compressor module or A-Coil module is not fully opened; Electronic expansion valve is abnormal; Fan of Blower module is not working properly; Refrigerant charging amount is insufficient; System pipeline is blocked; Refrigerant leakage

Troubleshooting

High Discharge temperature protection

Measure the

No

discharge temperature: does it have

reached 110?

Yes

Are the

Yes

electronic expansion valves

broken?

No

Replace the mainboard of Compressor module

Measure resistance value of discharge
temperature sensor: is it correct(50K)?
No
Replace relevant electronic expansion valve

Yes Replace the mainboard of Compressor module
Replace relevant discharge temperature sensor

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4.4.5 "EC" Water Flow Switch Protection
Error display: Compressor Module mainboard LED display screen Error judgment condition and method: If the water flow switch is detected for a continuous period of time, the system will enter Water Flow Switch Protection. The error code "EC" will be displayed on the main board display screen, and the unit shuts down. The error cannot be automatically cleared and can only be cleared through manual power off. Possible reason: Insufficient water flow in the system Water flow switch signal line loosening Water flow switch target failure

Water Flow Switch Protection Yes
Check the water pump : is it properly
work?
Yes
Check the water flow switch : is it
really error?
Yes
Check the water flow switch is correctly connected to the socket on
mainboard, is it? ?

Yes Connect the water pump power supply wire corrcetly

Check the No water pump power supply
wire is orrectly connected ,
is it ?

No Replace the water pump
No Adjust the valve angle

No

Check the filter : is it filth

blockage?

No

Check the water flow rate: is it within

Yes

normal range?

Complement the water

Yes Clean or replace the filter
No Check the orientation of plug and socket

Yes
Replace the water flow switch

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4.4.6 "C6" Discharge Temperature Sensor Error

Error display: Compressor Module mainboard LED display screen Error judgment condition and method: The resistance value of discharge temperature sensor is 50 K; Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error. Possible reason: Poor connection between temperature sensor and terminal in mainboard Temperature sensor is abnormal Detecting circuit is abnormal Troubleshooting

Discharge temperature sensor error

The temperature sensor is correctly connected to the socket on mainboard, is it?
Yes
Remove the temperature and measure its resistance value: is it within
normal range?
Yes
Replace the mainboard of compressor module

No Connect the temperature sensor corrcetly
No Replace the temperature sensor

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4.4.7 "H5" IPM Protection

Error display: Compressor Module mainboard LED display screen Error judgment condition and method: When power is connected and drive chip received IPM lead that is of low level, then it is IPM module malfunction. System will shut down for protection. Possible reason: Compressor 3-phase wire connection is lack of phase or phase-reversed. System is overloaded and compressor current is too large. IPM module is damaged. IPM module's 15V power supply is lower than 13.5V. 6-line PWM signal and the corresponding element are abnormal. Compressor current sampling circuit element is damaged or drive chip current sampling AD terminal is abnormal. Compressor is damaged. Troubleshooting

IPM Protection Yes

Check the fan of the Compressor module:

Yes

is it properly work?

No

Replace the fan of the Compressor module

Compressor 3-phase wire connection is lack of phase or
phase-reversing ?

Yes

Connect wires according to

the phase sequence

No

System is heavy-loaded? Compressor

Yes

current is too large?

No Replace the main board

Normal protection

Error still exists?

Yes

Replace the compressor

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4.4.8 "HC" PFC Protection

DC INVERTER GEOTHERMAL HEAT PUMP

Error display: Compressor Module mainboard LED display screen Error judgment condition and method: After power is connected, and drive chip received PFC lead that is of low level, then it is PFC module malfunction. System will shut down for protection. Possible reason: Power grid voltage is abnormal. Main board PFC module is damaged. Main board PFC module's 15V power supply is lower than 13.5V. Main board PWM signal for PFC and the corresponding element are abnormal. Main board PFC current sampling circuit element is damaged or drive chip current sampling AD terminal is abnormal. Troubleshooting

PFC Protection Yes
Check whether power grid No voltage is normal? No
Main board PFC is damaged?
No Replace the main board

Normal protection

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4.4.9 "P8" High Driver Module Temperature Protection

Error display: Compressor module mainboard LED display screen Error judgment condition and method: If IPM module temperature exceeds the set protection value, then it can be judged that driver module temperature is too high and system will shut down for protection. Possible reason: Thermal grease is not applied or not evenly applied to the module, or there is other substance on the back of the module. The module securing screws are not tightened up. Compressor module mainboard temperature sampling circuit element is damaged or drive chip temperature sampling AD terminal is abnormal. Troubleshooting

High Driver Module Temperature Protection
Yes

Check the fan of the Compressor module:

Yes

is it properly work?

Replace the fan of the Compressor module

No
Thermal grease is not applied or not evenly applied to the module? Is there foreign matter on the back
of the module
No

Yes

Apply the thermal grease evenly.

Remove the foreign matter.

The module securing

No

screws are note tightened?

Tighten the screws

Yes Replace the main board

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4.4.10 "H3" High-Pressure Sensor Error
Error display: Compressor module mainboard LED display screen Sample the AD value of pressure sensor through pressure sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error. Poor connection between pressure sensor and terminal in mainboard Pressure sensor is abnormal Detecting circuit is abnormal Troubleshooting
Pressure sensor error

The pressure sensor is correctly connected to the socket on mainboard, is it?
Yes

No

Check the orientation of

plug and socket

Measure the DC voltage value between black line and green line of the sensor: is it
OK?(0.5~4.5V)

No Replace the pressure sensor

Yes
Replace the mainboard of Compressor module

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4.4.11 "dc" Suction Temperature Sensor Error

Error display: Compressor module mainboard LED display screen Error judgment condition and method: The resistance value of suction temperature sensor is 20 K; Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error. Possible reason: Poor connection between temperature sensor and terminal in mainboard interface Temperature sensor is abnormal Detecting circuit is abnormal Troubleshooting
Suction temperature sensor error

The temperature sensor is correctly connected to the socket on mainboard, is it?
Yes
Remove the temperature and measure its resistance value: is it within
normal range?
Yes
Replace the mainboard of compressor module

No Connect the temperature sensor corrcetly
No Replace the temperature sensor

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4.4.12 "FB" Water Inlet Temperature Sensor Error
Error display: Compressor module mainboard LED display screen Error judgment condition and method: The resistance value of water inlet temperature sensor is 20 K; Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error. Possible reason: Poor connection between temperature sensor and terminal in mainboard interface Temperature sensor is abnormal Detecting circuit is abnormal Troubleshooting

Water inlet temperature sensor error

The temperature sensor is correctly connected to the socket on mainboard, is it?
Yes
Remove the temperature and measure its resistance value: is it within
normal range?
Yes
Replace the mainboard of compressor module

No Connect the temperature sensor corrcetly
No Replace the temperature sensor

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4.4.13 "FM" Water Outlet Temperature Sensor Error

Error display: Compressor module mainboard LED display screen Error judgment condition and method: The resistance value of water outlet temperature sensor is 20 K; Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error. Possible reason: Poor connection between temperature sensor and terminal in mainboard interface Temperature sensor is abnormal Detecting circuit is abnormal Troubleshooting
Water outlet temperature sensor error

The temperature sensor is correctly connected to the socket on mainboard, is it?
Yes
Remove the temperature and measure its resistance value: is it within
normal range?
Yes
Replace the mainboard of compressor module

No Connect the temperature sensor corrcetly
No Replace the temperature sensor

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4.4.14 "A7" Liquid Pipe Temperature Sensor Error
Error display: Compressor module mainboard LED display screen Error judgment condition and method: The resistance value of liquid pipe temperature sensor is 20 K; Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error. Possible reason: Poor connection between temperature sensor and terminal in mainboard interface Temperature sensor is abnormal Detecting circuit is abnormal Troubleshooting
Liquid pipe temperature sensor error

The temperature sensor is correctly connected to the socket on mainboard, is it?
Yes
Remove the temperature and measure its resistance value: is it within
normal range?
Yes
Replace the mainboard of compressor module

No Connect the temperature sensor corrcetly
No Replace the temperature sensor

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4.4.15 "C2" In-Tube Temperature Sensor Error
Error display: Compressor module mainboard LED display screen Error judgment condition and method: The resistance value of in-tube temperature sensor is 20 K; Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error. Possible reason: Poor connection between temperature sensor and terminal in mainboard interface Temperature sensor is abnormal Detecting circuit is abnormal Troubleshooting
In-tube temperature sensor error

The temperature sensor is correctly connected to the socket on mainboard, is it?
Yes
Remove the temperature and measure its resistance value: is it within
normal range?
Yes
Replace the mainboard of A- Coil module

No Connect the temperature sensor corrcetly
No Replace the temperature sensor

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4.4.16 "Cb" Gas Pipe Temperature Sensor Error
Error display: Compressor module mainboard LED display screen Error judgment condition and method: The resistance value of gas pipe temperature sensor is 20 K Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error. Possible reason: Poor connection between temperature sensor and terminal in mainboard interface Temperature sensor is abnormal Detecting circuit is abnormal Troubleshooting

Gas pipe temperature sensor error

The temperature sensor is correctly connected to the socket on mainboard, is it?
Yes
Remove the temperature and measure its resistance value: is it within
normal range?
Yes
Replace the mainboard of A- Coil module

No Connect the temperature sensor corrcetly

No

Replace the temperature

sensor

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4.4.17 "C1" Return Air Temperature Sensor Error
Error display: Compressor module mainboard LED display screen Error judgment condition and method: The resistance value of return air temperature sensor is15 K Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error. Possible reason: Poor connection between temperature sensor and terminal in mainboard interface Temperature sensor is abnormal Detecting circuit is abnormal Troubleshooting

Return air temperature sensor error

The temperature sensor is correctly connected to the socket on mainboard, is it?
Yes
Remove the temperature and measure its resistance value: is it within
normal range?
Yes
Replace the mainboard of A- Coil module

No Connect the temperature sensor corrcetly
No Replace the temperature sensor

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4.4.18 "E6" Communication Error
Error display: Compressor module mainboard LED display screen Error judgment condition and method: The communication between the compressor module and A-Coil module is bad, the display screen of the compressor module shows the error code, the green light of the A-Coil module mainboard will light for 1 second then flash 6 times. The unit will automatically restart after the communication has recovered for 30 seconds continuously. Possible reason: Poor connection of compressor module mainboard terminal Poor connection of A-Coil module mainboard terminal The power of A-Coil module or compressor module is cut off Detecting circuit is abnormal Interference of other equipment Troubleshooting

Communication error

Yes

Check

the communication line between Compressor module and A-Coil

No

module: is it properly

connected?

Yes

Check the

No

power of the unit: is it

turn on?

Connect the communication line corrcetly
Turn on the power

Yes
Measure the communication line: is it
through?
Yes
Is there any equipment which can emit electromagnetic waves near
the unit?
No

No Yes

Replace the transimission line
Remove the equipments 1 meter away from the unit

Replace the mainboard of unit

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4.4.19 "PL" DC Bus Under-Voltage Protection or DC Bus Voltage Drop Error

Error display: Compressor module mainboard LED display screen Error judgment condition and method: When compressor is running and there is no other error, if busbar voltage is lower than the set value for low voltage protection, the DC Bus Under-Voltage Protection or DC Bus Voltage Drop Error is reported. The display screen of the main board displays the error code, and the unit shuts down. Possible reason: Voltage is abnormal. Busbar voltage sampling circuit element is damaged or busbar voltage sampling AD terminal is abnormal. Troubleshooting
DC Bus Under-Voltage Protection or DC Bus Voltage Drop Error

Is voltage

Yes

below the normal

value?

No

Replace the mainboard

Normal protection

4.4.20 "PH" DC Bus Over-Voltage Protection

Error display: Compressor module mainboard LED display screen Error judgment condition and method: If there is no other malfunction and the busbar voltage is higher than the set value for high voltage protection, then it can be judged that DC bus over-voltage protection occurs, the display screen of the compressor module shows the error code. System will shut down for protection. Possible reason: Voltage is abnormal. Busbar voltage sampling circuit element is damaged or busbar voltage sampling AD terminal is abnormal. Troubleshooting
DC Bus Over-Voltage Protection

Is the

Yes

voltage higher than

normal value?

No

Replace the mainboard

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Normal protection

MRCOOL®
4.4.21 "PU" Charging Circuit Error

DC INVERTER GEOTHERMAL HEAT PUMP

Error display: Compressor module mainboard display screen Error judgment condition and method: When the charge loop starts to get charged and the busbar voltage cannot reach the set value in a certain period of time, the charging circuit error is reported, the display screen of the compressor module shows the error code. System will shut down for protection. Possible reason: Voltage is too low. Charge loop element is abnormal. Busbar voltage sampling circuit element is damaged or Busbar voltage sampling AD terminal is abnormal. Troubleshooting
Charging Circuit Error

Is voltage

Yes

below the normal

value?

No

Replace the mainboard

Normal protection

4.4.22 "LF" Power Protection

Error display: Compressor module mainboard LED display screen Error judgment condition and method: When the power of the unit is detected to be higher than normal for a continuous period of time, the system will enter Power Protection. The unit shuts down. The display screen of the compressor module shows the error code. After the compressor is shut down for a period of time, if the power is detected less than the limit value, the error is cleared, and the unit will return to normal and restart. If Power Protection occurs multiple times within a certain period of time, the error cannot be automatically cleared and can only be cleared through manual power off. Possible reason: Power is too high Detecting circuit is abnormal. Troubleshooting
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Power Protection

Is the power higher than

Yes

normal value?

No Replace the mainboard

Normal protection

4.4.23 "E5" Current Protection

Error display: Compressor module mainboard LED display screen Error judgment condition and method: When the power of the unit is detected to be higher than normal for a continuous period of time, the system will enter Current Protection. The unit shuts down. The display screen of the compressor module shows the error code. After the compressor is shut down for a period of time, if the current is detected less than the limit value, the error is cleared, and the unit will return to normal and restart. If Current Protection occurs multiple times within a certain period of time, the error cannot be automatically cleared and can only be cleared through manual power off. Possible reason: The unit current is too high Detecting circuit is abnormal. Troubleshooting

Current Protection

Is the current higher than

Yes

normal value?

No Replace the mainboard

Normal protection

4.4.24 "E0" Fan Error

Error display: Compressor module mainboard LED displayer Error judgment condition and method: If the fan error is detected for a continuous period of time, the display screen of the compressor module shows the error code, the green light of the A-Coil module mainboard will light for 1 second then flash 2 times. If the detection returns to normal for a continuous period of time, the unit will return to normal operation. If the
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continuous trigger protection exceeds a certain number of times, the error cannot be automatically cleared, the need to manually power off to clear the fault.
If the unit receives fan signal from the thermostat, but the fan does not operate, it is determined that the fan signal wiring between thermostat and the unit is abnormal, and the fan error is reported, the error cannot be automatically cleared, and can only be manually powered off to clear the error.
Possible reason: Fan error Detecting circuit is abnormal The fan signal wiring between thermostat and the unit is abnormal
Troubleshooting

Fan Error

Check the fan signal wiring between the thermostat
and the unit : is it properly connected?
Yes
Replace the fan of the Blower module,
error still exits ?
Yes Replace the mainboard

No

Adjust the wiring

No Use the new fan,The last one is damaged

4.4.25 "C9" Chip Error
Error display: Compressor module mainboard LED display screen Error judgment condition and method: If unit detect chip self-test abnormally, the display screen of the compressor module shows the error code, the error cannot be automatically cleared, and can only be manually powered off to clear the error. Possible reason: Chip self-test abnormally Troubleshooting Replace the mainboard of Compressor module.
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DC INVERTER GEOTHERMAL HEAT PUMP

Chip Error
Replace the mainboard of Compressor module

4.4.26 "LP" Capacity DIP Switch Setting Error
Error display: Compressor module mainboard LED display screen Error judgment condition and method: If the capacity of the compressor module and the A-Coil module is not consistent for a period of time, the compressor module mainboard display screen shows the error code, the green light of the A-Coil module mainboard will light for 1 second then flash 1 times and the unit shuts down. The error need to be cleared by manually powering off the unit. Possible reason: Compressor module and A-Coil module capacity dip switch setting error Detecting circuit is abnormal Troubleshooting
Capacity DIP Switch Setting Error

Check the capacity dip switches of Compressor module and A-Coil module: is it properly
setted?
Yes
Replace the mainboard

No Adjust the capacity dip switches

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DC INVERTER GEOTHERMAL HEAT PUMP

4.5 Failures Not Caused by Errors

(1) If your geothermal unit fails to function normally, please first check the following items before

maintenance: Problem
The geothermal unit can't run.

Cause If you turn off the unit and then immediately turn it on, in order to protect the compressor and avoid system overload, compressor will delay running for 3min.
Wire connection is wrong.

Bad cooling or heating effect.

Fuse or circuit breaker is broken.
Power failure. Power plug is loose. Air inlet and outlet of the units have been blocked. Improper temperature setting Fan speed is too low. Doors or windows are open.
Exposed under direct sunshine.
Too many heat sources in the room. Filter is blocked or dirty.

Corrective measure
Please wait for a while.
Connect wires according to the wiring diagram. Replace the fuse or switch on the circuit breaker. Restart after power is resumed. Re-insert the power plug. Clear the obstacles and keep the room for the units well ventilated. Reset a proper temperature. Reset a proper fan speed. Close them. Put on curtains or louvers in front of the windows. Remove unnecessary heat sources. Clean or change the filter.

The following situations are not operation failures.

Problem

Time of occurrence

Mist comes from the geothermal unit.

During operation.

When the unit is turned on, it purrs.

The geothermal unit generates some noise.

About 40s after the unit first enables the heating mode
There is hissing sound when the unit is started or stopped and a slight hissing sound during and after operation. There is a sound of crunching

Cause If the unit is running under high humidity, the wet air in the room will be quickly cooled down. When the system is just started, the refrigerant is not stable. About 30s later, the purr of the unit becomes low. It's the sound of 4-way valve switching direction. The sound will disappear after the valve changes its direction.
It's the sound of gaseous refrigerant that stops flowing and the sound of drainage system.
Because of temperature change,

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DC INVERTER GEOTHERMAL HEAT PUMP

Problem

Time of occurrence during and after operation.

Dust comes from the geothermal unit. The geothermal unit generates some smell.

There is a hissing sound when the unit is turned on or suddenly stopped during operation. The unit starts operation after being unused for a long time.
During operation.

Cause front panel and other components may be swelled up and cause abrasion sound. Because refrigerant suddenly stops flowing or changes the flow direction. Dust inside the units come out together with the air. The room smell or the smell of cigarette comes out through the units.

NOTICE: Check the above items and adopt the corresponding corrective measures. If the geothermal unit continues to function poorly, please stop the geothermal unit immediately and contact MRCOOL®'s authorized local service center. Ask our professional service staff to check and repair the unit.

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MRCOOL®
5 Maintenance 5.1 System Diagram

DC INVERTER GEOTHERMAL HEAT PUMP

5.2 Connection Pipe Vacuum Pumping

NOTICE

 Make sure the outlet of vacuum pump is away from fire source and is well-ventilated.  Before vacuum pumping, make sure the unit cut-off valves are closed.  When vacuum pumping, both the liquid pipe and the gas pipe must be pumped.
(1) Remove the caps of the liquid pipe cut-off valve, gas pipe cut-off valve and also the service port.

(2) Meanwhile the gas and liquid pipe cut-off valves should be kept closed in case of refrigerant leak.

(3) Connect the hose used for evacuation to the vacuum pump.

(4) Open the switch at the lower pressure side of the manifold valve assembly and start the vacuum pump.

Meanwhile, the switch at the high pressure side of the manifold valve assembly should be kept closed,

otherwise evacuation would fail.

(5) The evacuation duration depends on the unit's capacity, generally.

Model GCSHPM060IN GCSCAM060GN GCSHPM048IN GCSCAM048GN

Time(min) 35 35

And verify if the pressure gauge at the low pressure side of the manifold valve assembly reads -0.1Mpa
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DC INVERTER GEOTHERMAL HEAT PUMP

(-750mmHg), if not, it indicates there is leak somewhere. Then, close the switch fully and then stop the vacuum pump.
(6) Wait for 10min to see if the system pressure can remain unchanged. If the pressure increase, there may be leakage.
(7) Slightly open the liquid pipe cut-off valve and let some refrigerant go to the connection pipe to balance the pressure inside and outside of the connection pipe, so that air will not come into the connection pipe when removing the hose. Notice that the gas and liquid pipe cut-off valve can be opened fully only after the manifold valve assembly is removed.
(8) Place back the caps of the liquid pipe cut-off valve, gas pipe cut-off valve and also the service port.

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5.3 Refrigerant Charging

Pre-charging Step 1: Connect the high pressure gauge line to the valve of liquid pipe and connect the low pressure gauge line to the valve of gas pipe. Connect the middle gauge line to the vacuum pump. Power on the vacuum pump and perform vacuum drying. Step 2: After vacuum drying, close the high and low pressure gauge valves. Then remove the middle gauge line from the connector of vacuum pump. Then connect to the refrigerant tank. Step 3: Loosen the middle gauge line from the connector of pressure gauge to a proper extent and slightly open the valve of refrigerant tank. Evacuate the middle gauge line. Then tighten up the connector again and completely open the valve of refrigerant tank at the same time. Step 4: Keep the refrigerant tank erect and put it on an electronic scale. Record the current weight as m1.

Step 5: Open the high pressure gauge valve (Keep the low pressure gauge valve closed). Then charge refrigerant into the system. Meanwhile, record the weight of refrigerant tank as m2.
Step 6: m1-m2=m. If m equals to the required charging quantity M, close the valve of refrigerant tank at once. Then move to step 8.
Step 7: If you can't continue to charge refrigerant into the system and the quantity of charged refrigerant is less than the required charging quantity, then record the current quantity of charged refrigerant:
m=m1-m2 m`=M-m The remaining charging quantity is: m`=M-m Step 8: After charging, remove the pressure gauge.
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Refrigerant charging when unit is turned on: Step 1: Close the valve of refrigerant tank. First remove the pressure gauge lines and connect the compressor module and the A-Coil module. Then reconnect the pressure gauge lines. Connect the low pressure gauge line to the other joint of gas pipe cut-off valve and connect the high pressure gauge line to the liquid pipe cut-off valve. Connect the middle gauge line to the vacuum pump. Power on the vacuum pump and perform vacuum drying. Step 2: After vacuum drying, close the high and low pressure gauge valves. Then remove the middle gauge line from the connector of vacuum pump. Then connect to the refrigerant tank. Step 3: Loosen the middle gauge line from the connector of pressure gauge to a proper extent and slightly open the valve of refrigerant tank. Evacuate the middle gauge line. Then tighten up the connector again and completely open the valve of refrigerant tank at the same time. Step 4: Turn on the units and let it run for a while. Step 5: Open the low pressure gauge valve (Keep the high pressure gauge valve closed). Then charge in the remaining charging quantity m`. Step 6: After all required refrigerant is charged in, close the valve of refrigerant tank. Step 7: Remove the pressure gauge to finish the refrigerant charging work. Procedure of refrigerant charging Following is the supplementary requirement for refrigerant charging on the basis of normal procedure: 1) Make sure that when charging refrigerant into the system, no other types of refrigerant will be mixed.
The pipeline for refrigerant charging should be as short as possible to reduce the amount of refrigerant left in it. 2) The refrigerant tank should stand erect. 3) Make sure the refrigerating system is already grounded before refrigerant charging. 4) When charging is completed (or not yet completed), stick a label on the system. 5) Before re-charging refrigerant into the system, use oxygen-free nitrogen to perform pressure test. When charging is completed, perform leak test before trial running. Before leaving the workplace, perform a leak test again.

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5.4 Maintenance of Major Components

5.4.1 How to replace the compressor
5.4.1.1 Diagnosis of compressor failure
A. On condition that the unit can be started up Step 1: If the unit can be started up, then start it up to check the current of the faulted compressor. Use a pressure gauge to measure the pressure of the big and small valves. Connect with a computer to monitor the data. Refer to the following table based on the recommended working current. The electric current of an inverter compressor will be different under different rotation speed or different working conditions. If the compressor is working at 60Hz, the working current corresponding to different condensing temperature and evaporating temperature is shown below: Inverter compressor

Step 2: Judge whether the operating noise of the compressor is normal, and whether there is a sharp noise or obvious scraping. If there is a normal compressor working nearby, compare their operating noise. Step 3: Examine whether the electronic expansion valve of the unit is active and whether the 4-way valve works or not. How to examine: (1) Electronic expansion valve: The electronic expansion valve will be reset every time when the unit is powered on or off. Touch the valve and you can feel the movement of the valve spool. In the last stage of the reset process, you will hear the click of the valve and feel its vibration.
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Electronic expansion valve
Touch the electronic expansion valve: a. Touch the top of the electronic expansion valve and you can feel their move as they are reset upon startup. b. Make sure the coil is fixed firmly. (2) 4-way valve: During normal operation, the 4 copper tubes that connect to the valve will have different temperature. When the 4-way valve is working, it will generate some noise and vibration.
This is the position of the 4-way valve. Do not touch it directly with your hands. There is hot refrigerant at the discharge pipe, so be careful not to be scalded.
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D- Connect to the discharge side Caution! High temperature!
Labels on the 4-way valve: D-connect to the discharge side; E-connect to the evaporator of A-Coil module; S-connect to the inhalation side of the liquid separator; C-connect to the condenser; When the system is in cooling mode, C-the pipeline is with high pressure and high temperature; E, S-the pipeline is with low pressure and low temperature; When the system is in heating mode, E-the pipeline is with high pressure and high temperature; C, S-the pipeline is with low pressure and low temperature; Because D is connected to the discharge side, it is with high pressure and high temperature regardless of the operating mode. When the unit is powered on, in oil return mode, the 4-way valve will produce some noise. Do not touch the pipes directly with your hands and be cautious of the hot temperature. Step 4: Check the drive board of compressor, i.e. the IPM module. Please refer to the IPM checking method in the section of troubleshooting. Check the drive board of compressor, i.e. the IPM module. Please refer to the IPM checking method in the section of troubleshooting. BOn condition that the unit cannot be started up Step 1: Cut off the power supply and detach the cover of the wiring box of the compressor. Check the wiring of the compressor. Step 2: Check the resistance between the wiring terminals (U, V, W) of compressor.
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Use a universal KWh meter to measure the resistance between two terminals.
Measure the earth resistance of the three terminals respectively.

Refer to the following table for the resistance between any two terminals:

UV Winding resistance

VW Winding resistance

WU Winding resistance

0.67±5%

0.67±5%

0.67±5%

Measure the earth resistance of each wiring terminal. The resistance should be above 10 megohm. If not, we

can judge that the compressor is faulted inside.

Step 3:

On condition that the unit cannot be started up, we also need to check the solenoid valve assembly of the

system, including the electronic expansion valve. The checking method is the same as instructed above.

Step 4:

Check whether the IPM module is normal. Please refer to the IPM checking method in the section of

troubleshooting.

5.4.1.2 Replacement of compressor

Step 1: Preparation (1) Prepare the components for replacement When carrying the old and new compressors, do not place the compressors horizontally or upside down. The angle of inclination should be within ±30°. Make sure the lubricant inside the compressors will not flow from the oil balance mouth. The suction and discharge openings of the compressors must be sealed. If a rubber seal is missing, user adhesive tape to seal the opening. This is to prevent the compressor oil from contacting the air.

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Make sure the rubber seals of the suction and discharge openings of the compressor are in good condition.

DC INVERTER GEOTHERMAL HEAT PUMP

Make sure the electric box cover of the compressor is in good condition.

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NOTICE: Make sure the lubricant is sealed inside the compressors.
(2) Prepare relevant tools 1) Prepare nitrogen. Please strictly follow the nitrogen welding standards during the welding process. Make sure there is sufficient nitrogen. The nitrogen pressure should be above 2.0MPa; 2) Prepare welding rods. Prepare some welding rods of common specifications and some special welding rods that contain more than 5% silver. They are used to weld the compressor. The suction and discharge openings of the compressor are all connected to copper-plated steel pipes, so we need to use special welding rods and solder; 3) Prepare applicable welding tools. Please evaluate how much oxygen and acetylene should be used according to the current welding condition. Try to avoid repeated welding. 4) Prepare a complete set of tools, including an internal hexagonal wrench, diagonal pliers, pincer pliers, nipper pliers, a universal meter, a pressure gauge, cross screwdriver, straight screwdriver, more than two wrenches, insulating tape and wire cables.
Step 2: Disconnect power If the compressor needs to be replaced after judging as above, then switch off the compressor module and disconnect the power cable of the compressor module. Use insulating tape to wrap the power cable and put a notice board on the power switch to remind people to be cautious of electric shock. Step 3: Neaten the electric components When you detach the compressor wires and temperature sensors, mark them correspondingly for the convenience of reconnecting them. Step 4: Discharge refrigerant Discharge refrigerant from the system. Discharge simultaneously from the high pressure side and low pressure side. Do not discharge too fast (It should take more than 12h to completely discharge the refrigerant); otherwise, large quantity of lubricant will escape from the system together with the refrigerant. Step 5: Detach the compressor Check the condition of the damaged compressor, including its position and model. If the information of the compressor is confirmed, check the oil quality. (a) If the oil is clear and impurities-free, we consider that the oil of the system is not polluted. Meanwhile, if we confirm that the valves and pipes are also normal, then we can replace the compressor only. For the removal of compressor, please refer to the section: Removal of Major Components. How to check oil quality?

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(1) After the compressor is detached, put it on a solid ground and shake it at an angle of 30~45° to ensure that the contaminant at the bottom of the compressor can be poured out.
(2) Place the compressor at a position above the ground level and then pour out the oil from the air outlet of the compressor. Collect the oil in a transparent container. The amount of oil should be over 150ml.

NOTE: 1) The axial direction of the compressor should not slant at an angle larger than 20° to the horizontal direction. 2) Prevent the compressor from falling. 3) Put a transparent container (over 150ml in volume) under the discharge pipe to collect the compressor oil, thus we can see the oil quality.
(3) Put the container of compressor lubricant in a bright location and see if there is impurity and discoloration. Sniff at the compressor lubricant. Normally, there is no pungent smell.
(b) If the oil is contaminated, replace the compressor and the gas-liquid separator. NOTE: Confirm whether the compressor needs to be replaced. The pipe mouths of the faulted compressor must be sealed by adhesive tape as soon as the compressor is detached. Make sure the compressor is well preserved for the ease of future analysis.
Step 6: Clear the pipeline After confirming which parts of the system should be replaced, check the pipeline of the system. Blow through the main pipeline with nitrogen. After clearing the pipeline, if the components are not replaced immediately, seal the pipeline with adhesive tape to prevent the system from being contaminated by water and impurities in the air. Step 7: Replace the compressor For the removal of compressor, please refer to the section: Removal of Major Components. Step 8: Check the system for leaks (1) First of all, check each welding point. Check whether the welding points are smooth and whether there is
any obvious welding hole or other abnormal condition. (2) Next, fill high-pressure nitrogen into the system for leak detection. If it is only the compressor module
that needs to be repaired and the A-Coil module is confirmed normal, then it's OK to charge high-pressure nitrogen into the compressor module only. Fill in the nitrogen simultaneously from the high pressure side and low pressure side. We recommend charging the nitrogen from the big and small valves at the same time. The pressure of nitrogen should be above 20kgf. Then use soapy water to

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check for leaks. Check the welding points particularly. (3) Finally, retain the pressure of the system. Fill high-pressure nitrogen into the system and maintain the
pressure above 25kgf. Close the big and small valves and keep the pressure of A-Coil module and compressor module for more than 12h. If the pressure remains unchanged, then start vacuum pumping; otherwise, check the system for leaks again. Temperature should be considered when judging the pressure change. If temperature changes by 33.8°F (1), pressure will change by 0.01MPa or so. For example, if temperature is 86°F (30) when nitrogen of 2.5MPa is charged, and temperature changes to 77°F (25) after 12h, we consider that the system is qualified if the pressure is found at 2.43MPa or above. Step 9: Evacuate the system and charge refrigerant Please refer to the section of maintenance: vacuum pumping and refrigerant charging. Step 10: Connect electric components Connect cables, compressor wires and the electric heating belt according to the signs marked before and the wiring diagram on the cover of the electric box.

5.4.2 How to replace the drive module of compressor

Step 1: First, make sure that power is cut off. Set the universal meter at the AC voltage and measure the voltage between AC-L and N. If each time the voltage is 0V (Errors may occur to the universal meter, sometimes the voltage may not be 0V), proceed with the next step and put a sign on the power switch that reads "Under maintenance, don't switch on".
Step 2: Measure the voltage between DC bus P and UN on the drive board of the compressor. Set the universal meter at the DC voltage and measure the voltage between P and UN as shown below. If the voltage is below 36V, proceed with the next step. In case that a universal meter is not available, disconnect power for 20min and then continue with the next step.
Step 3: Remove all the wires on the drive board of the compressor with insulation glove. Step 4: Remove the screws on the drive board of the compressor. The screws are located in the white circles as shown above in the picture. Step 5: Replace with a new compressor drive board. Before replacement, apply some silica gel on the IPM modulerectifierMOSFET and diode. Step 6: Install the new compressor drive board. Fix the screws and connect the wires correctly.

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5.5 Removal of Major Components

5.5.1 Major Components of Compressor Module

Picture

Name

Function

Compressor

Through compression, the low pressure refrigerant occupies a less space. As its pressure and temperature both rise, it becomes high pressure and high temperature refrigerant. It is the power drive of the system.

4-Way Valve

Usually used in heat pump systems to switch the flow direction of refrigerant in the system, in order to achieve the conversion of unit cooling and heating

Introduce external air into the unit and cool the heating module on the main Fan
board through a heat sink to ensure normal operation of the main board.

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Picture

Name

DC INVERTER GEOTHERMAL HEAT PUMP
Function

Condenser

It is used to transfer partial heat of the hot flow to the cold flow so that the flow temperature can reach the specified index. It is an energy exchanging device.

Electronic Expansion Valve

The unit is equipped with two electronic expansion valves, located in the Compressor module and the A-Coil module, respectively, for the control of heating mode and cooling mode. The function of the electronic expansion valve is as follows: 1. Throttling and depressurization of high-pressure liquid refrigerant to ensure the pressure difference between the condenser and evaporator. 2. Adjust the refrigerant flow rate entering the evaporator to adapt to changes in the heat load of the evaporator and ensure stable operation of the refrigeration device.

Water-Flow Switch

Prevent freezing of the heat exchanger caused by a decrease in circulating water flow in the water system; Has anti freezing effect; When the system water volume decreased to its action setting value at that time, the stress on the target is reduced, resulting in the disconnection of the working path, the unit alarms and stops running.

Radiator

The air blown in by the fan cools the heating module behind the main board to ensure that the main board works normally.

High Pressure Sensor

Used to detect high pressure in the system, control the operation of the fan, and also have a system pressure protection function. When the pressure is too high, it will trigger relevant pressure protection actions.

High Pressure Switch

Used for detecting the high-pressure pressure of the unit in ground water system. Detect the system high-pressure, in order to protect the unit from abnormal operation. When the system high-pressure is higher than the set value, an error will be displayed and the unit will not start or stop.

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Picture

DC INVERTER GEOTHERMAL HEAT PUMP

Name

Function

Low Pressure Switch 2

Used for detecting the low-pressure pressure of the unit in ground loop system. Detect the system low-pressure, in order to protect the unit from abnormal operation. When the system low-pressure is lower than the set value, an error will be displayed and the unit will not start or stop.

Low Pressure Switch 1

Used for detecting the low-pressure pressure of the unit in ground water system. Detect the system low-pressure, in order to protect the unit from abnormal operation. When the system low-pressure is lower than the set value, an error will be displayed and the unit will not start or stop.

One Way Valve

The unit is equipped with two one-way valves, each connected in parallel in two electronic expansion valve flow paths, to ensure one-way flow of the refrigerant circuit.

Filter

Located before and after the electronic expansion valve, it is used to filter impurities in the system and prevent blockage.

5.5.2 Major Components of A-Coil Module

Picture

Name
Electronic Expansion Valve

Function The unit is equipped with two electronic expansion valves, located in the Compressor module and the A-Coil module, respectively, for the control of heating mode and cooling mode. The function of the electronic expansion valve is as follows: 1. Throttling and depressurization of high-pressure liquid refrigerant to ensure the pressure difference between the condenser and evaporator. 2. Adjust the refrigerant flow rate entering the evaporator to adapt to changes in the heat load of the evaporator and ensure stable operation of the refrigeration device.

Evaporator

Used for high-temperature and high-pressure gaseous refrigerant condensing and liquefying or low-temperature and low-pressure refrigerant evaporating; The condensation heat is carried away by the circulating air or the heat required for evaporation is provided by the indoor circulating air.

One Way Valve

The unit is equipped with two one-way valves, each connected in parallel in two electronic expansion valve flow paths, to ensure one-way flow of the refrigerant circuit.

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Picture

Name Filter

DC INVERTER GEOTHERMAL HEAT PUMP
Function
Located before and after the electronic expansion valve, it is used to filter impurities in the system and prevent blockage.

5.5.3 Major Components of Blower Module

Picture

Name

Function

Motor

The power drive of the fan. It enables the fan to run so as to provide smooth currents of air for forced convection and heat exchange of condenser and evaporator.

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5.5.4 Removal of Compressor Module Major Components

Model: GCSHPM048IN / GCSHPM060IN

Removal of compressor

NOTEBefore removing the compressor, make sure there is no refrigerant in the pipeline and power is cut off.

Step

Picture

Work instruction

1. Dismantle the screws

 Dismantle the four screws that fix the lid (note: during the integral installation, the unit has already removed this lid, and this step can be ignored)

2. Remove the lid

 Remove the lid (note: during the integral installation, the unit has already removed this lid, and this step can be ignored)

3. Remove the screws that secure the top cover

 Remove the 23 screws that secure the top cover

4. Remove the cover

 Remove the cover

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Removal of compressor

NOTEBefore removing the compressor, make sure there is no refrigerant in the pipeline and power is cut off.

Step

Picture

Work instruction

5. Remove the screws fixing the Panel (front)

 Pull out the two rubber plugs of the panel (front), and then remove the five screws fixing the Panel (front), and the four bolts fixing the Computer fan (note: there are also two screws under the rubber plug)

6. Remove the Panel (front)
7. Remove the screws fixing the Panel (left) and Panel (valve)
8. Remove the Panel (left) and Panel (valve)

 Remove the Panel (front)
 Pull out the 2 rubber plugs on the Panel (left), and then remove the 5 screws that secure the Panel (left) (note: there are also two screws under the rubber plugs)
 Dismantle the four screws that fix the size globe valve, the four bolts that fix the inlet and outlet water pipes, and the two screws that fix the Panel (valve)
 Remove the panel (left)  Remove the panel (valve)
(Note: Before removing the panel (valve), it is necessary to first remove the bracket next to the fixed bracket of the large and small shut-off valves, and fix it with two screws )
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Removal of compressor

NOTEBefore removing the compressor, make sure there is no refrigerant in the pipeline and power is cut off.

Step

Picture

Work instruction

9. Weld out the interfaces

 Weld out the interfaces marked in the diagram in preparation for removing the four way valve components and compressor

10. Remove the 4-way valve component
11. Dismantle the nut

 Remove the 4-way valve component
 Dismantle the three nuts securing the compressor foot pads (note: the two compressor foot pads in front of the compressor have been removed before installation and operation)

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Removal of compressor

NOTEBefore removing the compressor, make sure there is no refrigerant in the pipeline and power is cut off.

Step

Picture

Work instruction

12. Removing and replacing the compressor

 Removing and replacing the compressor

Model: GCSHPM048IN / GCSHPM060IN

Removal of 4-Way Valve

NOTEBefore removing the 4-Way valve, make sure there is no refrigerant in the pipeline and power is cut off.

The first ten steps are consistent with the first ten steps of replacing the compressor.

Step

Picture

Work instruction

1. Weld out the interface

 Weld out the interface marked in the diagram in preparation for replacing the 4-way valve

2. Remove and replace the four-way valve

 Remove and replace the four-way valve

Model: GCSHPM048IN / GCSHPM060IN

Removal of Co-axial Heat Exchanger

NOTE: Before removing the Co-Axial Heat Exchanger, make sure there is no refrigerant in the pipeline and power is cut off.

The first four steps are consistent with the first four steps of replacing the compressor

Step

Picture

Work instruction

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Removal of Co-axial Heat Exchanger

NOTE: Before removing the Co-Axial Heat Exchanger, make sure there is no refrigerant in the pipeline and power is cut off.

The first four steps are consistent with the first four steps of replacing the compressor

Step

Picture

Work instruction

1. Preparation for replacing the co-axial heat exchanger

 The first four steps are consistent with the first four steps of replacing the compressor

2. Remove the screws fixing the Panel (left) and Panel (valve)
3. Remove the Panel (left) and Panel (valve)
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 Pull out the 2 rubber plugs on the Panel (left), and then remove the 5 screws that secure the Panel (left) (note: there are also two screws under the rubber plugs)
 Dismantle the four screws that fix the size globe valve, the four bolts that fix the inlet and outlet water pipes, and the two screws that fix the Panel (valve)
 Remove the Panel (left)  Remove the Panel (valve)
(Note: Before removing the Panel (valve), it is necessary to first remove the bracket next to the fixed bracket of the large and small shut-off valves, and fix it with two screws at the top and bottom)

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Removal of Co-axial Heat Exchanger

NOTE: Before removing the Co-Axial Heat Exchanger, make sure there is no refrigerant in the pipeline and power is cut off.

The first four steps are consistent with the first four steps of replacing the compressor

Step

Picture

Work instruction

4. Remove the water flow switch and inlet/outlet water temperature sensor

 Remove the water flow switch and inlet/outlet water temperature sensor

5. Weld out the interfaces

 Weld out the interfaces marked in the diagram in preparation for removing the co-axial heat exchanger

6. Dismantle the nuts

 Dismantle the four nuts securing the co-axial heat exchanger
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Removal of Co-axial Heat Exchanger

NOTE: Before removing the Co-Axial Heat Exchanger, make sure there is no refrigerant in the pipeline and power is cut off.

The first four steps are consistent with the first four steps of replacing the compressor

Step

Picture

Work instruction

7. Removing and replacing the co-axial heat exchanger.

 Removing and replacing the co-axial heat exchanger

Model: GCSHPM048IN / GCSHPM060IN

Removal of pressure sensor/pressure switch

NOTE: Before removing the pressure sensor/pressure switch, make sure there is no refrigerant in the pipeline and power is cut off.

The first ten steps are consistent with the first ten steps of replacing the compressor

Step

Picture

Work instruction

1. Remove the 4-way valve component

 The first ten steps are consistent with the first ten steps of compressor replacement

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Removal of pressure sensor/pressure switch

NOTE: Before removing the pressure sensor/pressure switch, make sure there is no refrigerant in the pipeline and power is cut off.

The first ten steps are consistent with the first ten steps of replacing the compressor

Step

Picture

Work instruction

2. Remove and replace the high pressure sensor

 Remove the pipe fixing block and wire tie for fixing the pressure sensor
 Welding off the pressure sensor interface
 Remove and replace the high pressure sensor

3. Remove and replace the high pressure switch
4. Remove and replace the pressure switch low pressure switch 2

 Remove the pipe fixing block and wire tie of the fixed high pressure switch
 Weld out the interface of the high pressure switch
 Remove and replace the high pressure switch
 Remove the pipe fixing block and wire tie of the fixed pressure low pressure switch 2
 Weld off the interface of the low pressure switch 2
 Remove the pressure switch low pressure switch 2 and replace it
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Removal of pressure sensor/pressure switch

NOTE: Before removing the pressure sensor/pressure switch, make sure there is no refrigerant in the pipeline and power is cut off.

The first ten steps are consistent with the first ten steps of replacing the compressor

Step

Picture

Work instruction

5. Remove and replace the low pressure switch 1

 Remove the pipe fixing block and wire tie that fix the low pressure switch 1
 Weld off the interface of the low pressure switch 1
 Remove and replace the low pressure switch 1

Model: GCSHPM048IN / GCSHPM060IN

Removal of Electronic Expansion Valve

NOTE: Before removing the Electronic Expansion Valve, make sure there is no refrigerant in the pipeline and power is cut off.

The first six steps are consistent with the first six steps of replacing the compressor

Step

Picture

Work instruction

1. Preparation for replacing the electronic expansion valve

 The first six steps are consistent with the first six steps of compressor replacement

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Removal of Electronic Expansion Valve

NOTE: Before removing the Electronic Expansion Valve, make sure there is no refrigerant in the pipeline and power is cut off.

The first six steps are consistent with the first six steps of replacing the compressor

Step

Picture

Work instruction

2. Remove the fixed bracket of the electronic expansion valve

 Firstly, remove the fixed bracket of the electronic expansion valve
 Remove the electronic expansion valve fixing block
 Remove the welding interface

3. Remove and replace the electronic expansion valve

 Remove and replace the electronic expansion valve

Model: GCSHPM048IN / GCSHPM060IN

Step

Removal of Fan

NOTE: Before removing the Fan, make sure power is cut off.

The first six steps are consistent with the first six steps of replacing the compressor

Picture

Work instruction

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Step

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Removal of Fan

NOTE: Before removing the Fan, make sure power is cut off.

The first six steps are consistent with the first six steps of replacing the compressor

Picture

Work instruction

1. Preparation for replacing the fan

 The first six steps are consistent with the first six steps of compressor replacement.
 Remove two screws fixing the fan.

2. Remove the fan component

 Remove the fan component

3. Remove the screws fixing the fan

 Remove two screws fixing the fan

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Step

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Removal of Fan

NOTE: Before removing the Fan, make sure power is cut off.

The first six steps are consistent with the first six steps of replacing the compressor

Picture

Work instruction

4. Removing the fan

 Removing the fan and replacing

Model: GCSHPM048IN / GCSHPM060IN

Step

Removal of Radiator NOTE: Before removing the Radiator, make sure power is cut off.
Picture

Work instruction

1. Removing the nine screws fixing the Panel (right)

 Pulling out the two rubber plugs of the Panel (right), and then removing the nine screws fixing the Panel (right) (note: there are also two screws under the rubber plug)

2. Remove the right side panel

 Remove the right side panel

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Step

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Removal of Radiator NOTE: Before removing the Radiator, make sure power is cut off.
Picture

Work instruction

3. Remove the mainboard

 Remove 16 screws that secure the mainboard and Remove the mainboard

4. Remove the screws

 Remove the screws that secure the injection molded parts of the main board (a total of 4)

5. Remove the electrical retaining plate
6. Remove the main board

 Remove the electrical retaining plate
 Remove all the screws
(totaling 7) that secure the main board and remove the main board
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Step

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Removal of Radiator NOTE: Before removing the Radiator, make sure power is cut off.
Picture

Work instruction

7. Replace the radiator

 Remove all the screws (6 in
total) that secure the radiator and replace it.

Model: GCSHPM048IN / GCSHPM060IN

Step

Removal of Water-Flow Switch NOTE: Before removing the Water-Flow Switch, make sure power is cut off.
Picture

Work instruction

1. Remove the screws

 Pull out the 2 rubber plugs on the Panel (left), and then remove the 8 screws that secure the Panel (left) (note: there are also two screws under the rubber plugs)

2. Remove the left side panel

 Remove the left side panel

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Step

DC INVERTER GEOTHERMAL HEAT PUMP

Removal of Water-Flow Switch NOTE: Before removing the Water-Flow Switch, make sure power is cut off.
Picture

Work instruction

3. Replace the water-flow switch.

 Loosen the nut that fixes the water flow switch to remove it and replace it with the inlet and outlet water temperature sensor

5.5.5 Removal of A-Coil Module Major Components

Model: GCSCAM048GN / GCSCA060GN

Step

Removal of Evaporator

NOTE: Before removing the Evaporator, make sure power is cut off.

Picture

Work instruction

1. Remove the screws

 Remove the nine screws from the cover
assembly 3.

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Step

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Removal of Evaporator

NOTE: Before removing the Evaporator, make sure power is cut off.

Picture

Work instruction

2. Remove cover plate

 Remove cover plate assembly 3.

3. Remove the screws
4. Remove the top cover and cover plate
5. Remove the screws

 Remove all screws from the top cover and cover plate components (1 and 2). Note that the screws securing the valve also need to be removed.
 Remove the top cover and cover plate components (1, 2).
 Remove the screws that secure the bracket of the electrical box and the fixing plate of the drain pan. Note that there are also fixing screws between the bracket of the electrical box and the evaporator.
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Step

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Removal of Evaporator

NOTE: Before removing the Evaporator, make sure power is cut off.

Picture

Work instruction

6. Remove the screws

 Remove the fixing screws between the electrical box bracket and the evaporator.

7. Remove the electrical box bracket and the drain pan fixing
plate.

 Remove the electrical box bracket and the drain pan fixing plate.

8.Pull the evaporator components out

 Pull the evaporator components out in the direction shown.

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Step

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Removal of Evaporator

NOTE: Before removing the Evaporator, make sure power is cut off.

Picture

Work instruction

9. Remove the screws

 Remove the fixing screws of the evaporator and the drain pan, with 3 screws in the front and 3 screws in the back, totaling 6 screws.

10. Remove the evaporator.

 Remove the evaporator.

Model: GCSCAM048GN / GCSCA060GN

Step

Removal of Main Board

NOTE: Before removing the Main Board, make sure power is cut off.

Picture

Work instruction

1. Remove the screws

 Remove the nine screws from the cover
assembly 3.

79

MRCOOL®
Step

DC INVERTER GEOTHERMAL HEAT PUMP

Removal of Main Board

NOTE: Before removing the Main Board, make sure power is cut off.

Picture

Work instruction

2. Remove cover plate

 Remove cover plate assembly 3.

3. Remove the screws
4.Remove the top cover and cover plate

 Remove all screws from the top cover and cover plate components (1 and 2). Note that the screws securing the valve also need to be removed.
 Remove the top cover and cover plate components (1, 2).

80

MRCOOL®
Step

DC INVERTER GEOTHERMAL HEAT PUMP

Removal of Main Board

NOTE: Before removing the Main Board, make sure power is cut off.

Picture

Work instruction

5. Remove the screws

 Remove the screws that secure the electrical box bracket. Note that there are also fixing screws between the electrical box bracket and the evaporator.

6. Remove the screws

 Remove the fixing screws between the electrical box bracket and the evaporator.

7.Remove the screws

 Remove the six screws from the electrical box cover.

81

MRCOOL®
Step

DC INVERTER GEOTHERMAL HEAT PUMP

Removal of Main Board

NOTE: Before removing the Main Board, make sure power is cut off.

Picture

Work instruction

8.Remove the electrical box cover

 Remove the electrical box cover and remove the three screws of the bracket assembly. Remove all wiring from the wiring board and main board.

9.Remove the bracket assembly

 Remove the bracket assembly and wiring board (6-position), and remove the four screws that secure the main board.

10.Remove the main board.

 Remove the main board.

Model: GCSCAM048GN / GCSCA060GN

Step

Removal of Drain Pan NOTE: Before removing the Drain Pan, make sure power is cut off.
Picture

Work instruction

82

MRCOOL®
Step

DC INVERTER GEOTHERMAL HEAT PUMP

Removal of Drain Pan NOTE: Before removing the Drain Pan, make sure power is cut off.
Picture

Work instruction

1. Remove the screws

 Remove the nine screws from the cover
assembly 3.

2. Remove cover plate

 Remove cover plate assembly 3.

3. Remove the screws
4. Remove the top cover and cover plate

 Remove all screws from the top cover and cover plate components (1 and 2). Note that the screws securing the valve also need to be removed.
 Remove the top cover and cover plate components (1, 2).
83

MRCOOL®
Step

DC INVERTER GEOTHERMAL HEAT PUMP

Removal of Drain Pan NOTE: Before removing the Drain Pan, make sure power is cut off.
Picture

Work instruction

5. Remove the screws

 Remove the screws that secure the bracket of the electrical box and the fixing plate of the drain pan. Note that there are also fixing screws between the bracket of the electrical box and the evaporator.

6. Remove the screws

 Remove the fixing screws between the electrical box bracket and the evaporator.

7. Remove the electrical box bracket and the drain pan fixing
plate.

 Remove the electrical box bracket and the drain pan fixing plate.

8.Pull the evaporator components out

 Pull the evaporator components out in the direction shown.
84

MRCOOL®
Step

DC INVERTER GEOTHERMAL HEAT PUMP

Removal of Drain Pan NOTE: Before removing the Drain Pan, make sure power is cut off.
Picture

Work instruction

9. Remove the screws

 Remove the fixing screws of the evaporator and the drain pan, with 3 screws in the front and 3 screws in the back, totaling 6 screws.

10 Remove the evaporator.

 Remove the evaporator and replace the drain pan.

Model: GCSCAM048GN / GCSCA060GN

Removal of Electronic Expansion Valve

NOTE: Before removing the Electronic Expansion Valve, make sure power is cut off.

Step

Picture

Work instruction

1.Rotate the electronic expansion valve

 Rotate the electronic expansion valve to make it detachable.

85

MRCOOL®
2.Remove and replace the electronic expansion valve.

DC INVERTER GEOTHERMAL HEAT PUMP
 Remove and replace the electronic expansion valve.

5.5.3 Removal of Blower Module Major Components

Model: GCSBLM013 / GCSBLM014

Step

Removal of Blower NOTE: Before removing the Blower, make sure power is cut off.
Picture

Work instruction

1.Remove the screws

 Remove twenty screws from the top cover and front panel.

2. Remove the top cover and front panel.

 Remove the top cover and front panel.

86

MRCOOL®
Step

DC INVERTER GEOTHERMAL HEAT PUMP

Removal of Blower NOTE: Before removing the Blower, make sure power is cut off.
Picture

Work instruction

3. Remove the screws and fixed bracket.

 Remove the fixing bracket screws (two in total);
 Remove the fixed bracket.

4.Remove the blower.

 Remove the two screws that secure the fan
 Drag the blower out in that direction

5.Replace the motor

 Remove the three bolt assemblies that secure the motor and replace the motor

87

MRCOOL®

DC INVERTER GEOTHERMAL HEAT PUMP

5.6 Explosive View and Lists of Parts

5.6.1 Compressor Module Explosive View and Lists of Parts
Model: GCSHPM060IN

No.

Material name

1

O-Ring

2

High Pressure Sensor

3

Front Panel Sub-Assy

4

Water Flow Switch

5

Double Pipe Heat Exchanger

88

Part Number 760010000026 43004400001503 209004060461 430019000006 010011060075

MRCOOL®
No. 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

Material name 4 Way Valve Coil
4-Way Valve Lid
Top Cover Sub-Assy Air Duct Sub-assy Front Panel
High Pressure Switch Low Pressure Switch(Ground Water) Low Pressure Switch(Ground Loop)
Electrical Retaining Plate Terminal Board Terminal Board Filter Board Main Board Terminal Board
Connection Board Electric Raceway Front Panel Sub-Assy
Supporter Rubber Band
Radiator Electric Expand Valve Fitting Electronic Expansion Valve
One Way Valve Sensor Insert
Supporter Tube Clip Base Frame Assy Supporter Front Panel Sub-Assy Front Panel Sub-Assy Terminal Board Supporter Cable-Cross Loop Fan(radiation) Rubber cover
Filter Electric Box Assy
Front Panel Cut-off valve 3/8(N) Temp Sensor Sleeving
Cut off Valve Handle
Compressor and Fittings Temperature Sensor clamp
89

DC INVERTER GEOTHERMAL HEAT PUMP
Part Number 07201006000603
43000338 012035062355P 017069060114P 017107060214 209004060460
46020006 460200044 4602001596 20022700000101 42200006001201 42000100000102 300020060118 300027063069 422000000010 012077062176P 4201030203 209004060463 012060084641P 7661280504 430034060222 4304413266 072009060008 071001060011 42020063 012060086009P 021400053P 000043060667 012060084642P 209004060455 209004060448 42010185 012060086133P 765100263 49010501 22240007 035021060019 100002080271 012073063661P 071302391 05212423 070001000009 2690410001601 009001060898 02145007

MRCOOL®
No. 51

Material name Sensor Sub-assy

Model: GCSHPM048IN

DC INVERTER GEOTHERMAL HEAT PUMP
Part Number 390002060442

No.

Material name

1

O-Ring

2

High Pressure Sensor

3

Front Panel Sub-Assy

4

Water Flow Switch

5

Double Pipe Heat Exchanger

6

4 Way Valve Coil

7

4-Way Valve

90

Part Number 760010000026 43004400001503 209004060461 430019000006 010011060075 07201006000603
43000338

MRCOOL®
No. 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

Material name Lid
Top Cover Sub-Assy Air Duct Sub-assy Front Panel
High Pressure Switch Low Pressure Switch(Ground Water) Low Pressure Switch(Ground Loop)
Electrical Retaining Plate Terminal Board Terminal Board Filter Board Main Board Terminal Board
Connection Board Electric Raceway Front Panel Sub-Assy
Supporter Rubber Band
Radiator Electric Expand Valve Fitting Electronic Expansion Valve
One Way Valve Sensor Insert
Supporter Tube Clip Base Frame Assy Supporter Front Panel Sub-Assy Front Panel Sub-Assy Terminal Board Supporter Cable-Cross Loop Fan(radiation) Rubber cover
Filter Electric Box Assy
Front Panel Cut-off valve 3/8(N) Temp Sensor Sleeving
Cut off Valve Handle
Compressor and Fittings Temperature Sensor clamp
Sensor Sub-assy

DC INVERTER GEOTHERMAL HEAT PUMP
Part Number 012035062355P 017069060114P 017107060214 209004060460
46020006 460200044 4602001596 20022700000101 42200006001201 42000100000102 300020060118 300027063706 422000000010 012077062176P 4201030203 209004060463 012060084641P 7661280504 430034060222 4304413266 072009060008 071001060011 42020063 012060086009P 021400053P 000043060667 012060084642P 209004060455 209004060448 42010185 012060086133P 765100263 49010501 22240007 035021060019 100002080271 012073063661P 071302391 05212423 070001000009 2690410001601 009001060898 02145007 390002060442

91

MRCOOL®

DC INVERTER GEOTHERMAL HEAT PUMP

5.6.2 A-Coil Module Explosive View and Lists of Parts

Model: GCSCAM060GN

No.

Material name

Part Number

1

Rear Side Plate Sub-Assy

017051060175

2

Filter

035021060019

3

Evaporator Assy

011001062780

4

Right Side Plate Sub-Assy

000130060170

5

Air Outlet Frame Sub-assy

000117060028

6

Water Tray

2690220601

7

Sensor Insert

42020063

92

MRCOOL®
No. 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

Material name Choke Plug Retaining Plate (Water Level Switch) Support Assy Cable-Cross Loop Cover Plate Sub-Assy Plastic Cover Cover Plate Sub-Assy Cover Plate Sub-Assy Electric Box Cover Electric Box Assy Rubber Band Rubber Band Support Assy Cut off Valve 3/4N Temp Sensor Sleeving Cut off Valve 3/8N Water Tray One Way Valve Tube Clip Electronic Expansion Valve Left Side Plate Sub-Assy Electric Expand Valve Fitting Support Assy Top Cover Sub-Assy Transformer Terminal Board Main Board Cable Cross Loop Terminal Board Cable Cross Loop

DC INVERTER GEOTHERMAL HEAT PUMP
Part Number 76718209 012066062210 000157060222 765100263 011657060546 26902209 011657060547 011657060556 012020061074P 100002078180 7661280504 7661280503 000157060224 070001000009 05212423 071302391 2690220501 071001060012 021400053P 072009060008 017037060351 07200206002329 000157060223 000051060221 43110286 422000060007 300002063486 76510021 42000100000102 76510021

93

MRCOOL® Model: GCSCAM048GN

DC INVERTER GEOTHERMAL HEAT PUMP

No.

Material name

1

Rear Side Plate Sub-Assy

2

Filter

3

Evaporator Assy

4

Right Side Plate Sub-Assy

5

Air Outlet Frame Sub-assy

6

Water Tray

7

Sensor Insert

8

Choke Plug

94

Part Number 017051060175 035021060019 011001062780 000130060170 000117060028
2690220601 42020063 76718209

MRCOOL®
No. 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

Material name Retaining Plate (Water Level Switch)
Support Assy Cable-Cross Loop Cover Plate Sub-Assy
Plastic Cover Cover Plate Sub-Assy Cover Plate Sub-Assy
Electric Box Cover Electric Box Assy
Rubber Band Rubber Band Support Assy Cut off Valve 3/4N Temp Sensor Sleeving Cut off Valve 3/8N Water Tray One Way Valve
Tube Clip Electronic Expansion Valve
Left Side Plate Sub-Assy Electric Expand Valve Fitting
Support Assy Top Cover Sub-Assy
Transformer Terminal Board
Main Board Cable Cross Loop
Terminal Board Cable Cross Loop

DC INVERTER GEOTHERMAL HEAT PUMP
Part Number 012066062210 000157060222
765100263 011657060546
26902209 011657060547 011657060556 012020061074P 100002081473
7661280504 7661280503 000157060224 070001000009
05212423 071302391 2690220501 071001060012 021400053P 072009060008 017037060351 07200206002329 000157060223 000051060221 43110286 422000060007 300002063947 76510021 42000100000102 76510021

95

MRCOOL®

DC INVERTER GEOTHERMAL HEAT PUMP

5.6.3 Blower Module Explosive View and Lists of Parts
Model: GCSBLM013 / GCSBLM014

No.

Material name

1

Front Panel Sub-Assy

2

Top Cover Sub-Assy

3

Supporter

4

Front Panel Sub-Assy

5

Front Panel Sub-Assy

6

Retaining Plate Sub-Assy

7

Fan fixing plate assembly 1

8

Cover Plate Sub-Assy

9

Wire

10

Sponge

11

Front Panel Sub-Assy

12

Support Assy

13

Centrifugal fan assy

14

Centrifugal Fan Housing

15

Brushless DC Motor

96

Part Number 209004060428 000051060226 012060084723P 209004060427 209004060429 017032060759
01842232 011657060549P 012222000025 110000076297 209004060430 000157060233 000052060818
1570220301 15010400001304

MRCOOL®

DC INVERTER GEOTHERMAL HEAT PUMP

5 COMMON PARAMETER LISTS

5.1 Temperature/Pressure List of Refrigerant

Temperature  -30 -29 -28 -27 -26 -25 -24 -23 -22 -21 -20 -19 -18 -17 -16 -15 -14 -13 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1

Pressure kPa 275 286 298 311 324 334 348 363 375 391 404 424 435 453 468 483 504 520 538 556 579 598 618 639 660 682 705 728 752 777

R410A Temperature
 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

Pressure kPa 803 823 851 879 903 937 962 994 1020 1050 1090 1110 1150 1180 1220 1250 1280 1320 1350 1400 1440 1470 1520 1560 1600 1640 1680 1730 1780 1820

Temperature  30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

Pressure kPa 1880 1910 1960 2030 2080 2130 2180 2240 2290 2350 2410 2460 2510 2580 2650 2710 2770 2840 2910 2980 3050 3100 3180 3250 3320 3400 3480 3540 3630 3720

97

MRCOOL®

DC INVERTER GEOTHERMAL HEAT PUMP

5.2 Resistance / Temperature Lists of Temperature Sensors

5.2.1 Voltage list of 15 k temperature sensors (including return air

temperature sensors)

Temp. 
-20 -19 -18 -17 -16 -15 -14 -13 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Resistance (k) 144 138.1 128.6 121.6 115 108.7 102.9 97.4 92.22 87.35 82.75 78.43 74.35 70.5 66.88 63.46 60.23 57.18 54.31 51.59 49.02 46.8 44.31 42.14 40.09 38.15 36.32 34.58 32.94 31.38 29.9 28.51 27.18 25.92 24.73 23.6 22.53

Voltage (15K/5V)
0.472 0.49 0.522 0.549 0.577 0.606 0.636 0.667 0.699 0.733 0.767 0.803 0.839 0.877 0.916 0.956 0.997 1.039 1.082 1.126 1.172 1.214 1.265 1.313 1.361 1.411 1.461 1.513 1.564 1.617 1.67 1.724 1.778 1.833 1.888 1.943 1.998

Voltage (15K/3.3V
0.311 0.323 0.345 0.362 0.381
0.4 0.42 0.44 0.462 0.484 0.506 0.53 0.554 0.579 0.605 0.631 0.658 0.686 0.714 0.743 0.773 0.801 0.835 0.866 0.899 0.931 0.965 0.998 1.033 1.067 1.102 1.138 1.174 1.21 1.246 1.282 1.319
98

Temp. 
25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62

Resistance (k) 15 14.36 13.74 13.16 12.6 12.07 11.57 11.09 10.63 10.2 9.779 9.382 9.003 8.642 8.297 7.653 7.352 7.065 6.791 6.529 6.278 6.038 5.809 5.589 5.379 5.179 4.986 4.802 4.625 4.456 4.294 4.139 3.99 3.848 3.711 3.579 3.454

Voltage (15K/5V)
2.5 2.554 2.61 2.663 2.717 2.771 2.823 2.875 2.926 2.976 3.027 3.076 3.125 3.172 3.219 3.311 3.355 3.399 3.442 3.484 3.525 3.565 3.604 3.643 3.68 3.717 3.753 3.787 3.822 3.855 3.887 3.919 3.949 3.979 4.008 4.037 4.064

Voltage (15K/3.3V
1.65 1.686 1.722 1.758 1.793 1.829 1.863 1.897 1.931 1.964 1.998 2.03 2.062 2.094 2.125 2.185 2.215 2.243 2.272 2.299 2.326 2.353 2.379 2.404 2.429 2.453 2.477
2.5 2.522 2.544 2.566 2.586 2.607 2.626 2.646 2.664 2.682

MRCOOL®
17 18 19 20 21 22 23 24

21.51 20.54 19.63 18.75 17.93 17.14 16.39 15.68

2.054 2.11 2.166 2.222 2.278 2.334 2.389 2.445

1.356 1.393 1.429 1.467 1.503 1.54 1.577 1.613

DC INVERTER GEOTHERMAL HEAT PUMP

63

3.333

4.091

2.7

64

3.217

4.117

2.717

65

3.105

4.143

2.734

66

2.998

4.167

2.75

67

2.898

4.19

2.766

68

2.797

4.214

2.781

69

2.702

4.237

2.796

70

2.611

4.259

2.811

99

MRCOOL®

DC INVERTER GEOTHERMAL HEAT PUMP

5.2.2 Voltage list of 20 k pipeline temperature sensors (including temperature sensors for water inlet, water outlet, liquid/gas pipe, suction, in-tube)

Temp. 
-20 -19 -18 -17 -16 -15 -14 -13 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Resistance (k)
196.9 181.4 171.4 162.1 153.3 145 137.2 129.9 123 116.5 110.3 104.6 99.13
94 89.17 84.61 80.31 76.24 72.41 68.79 65.37 62.13 59.08 56.19 53.46 50.87 48.42 46.11 43.92 41.84 39.87 38.01 36.24 34.57 32.98 31.47 30.04 28.68

Voltage (15K/5V)
0.461 0.497 0.522 0.549 0.577 0.606 0.636 0.667 0.699 0.733 0.767 0.803 0.839 0.877 0.916 0.956 0.997 1.039 1.082 1.126 1.171 1.218 1.265 1.313 1.361 1.411 1.462 1.513 1.564 1.617 1.67 1.724 1.778 1.833 1.888 1.943 1.998 2.054

Voltage (15K/3.3V

Temp. 

0.304

28

0.328

29

0.345

30

0.362

31

0.381

32

0.4

33

0.42

34

0.44

35

0.462

36

0.484

37

0.507

38

0.53

39

0.554

40

0.579

41

0.605

42

0.631

43

0.658

44

0.686

45

0.714

46

0.743

47

0.773

48

0.804

49

0.835

50

0.866

51

0.898

52

0.931

53

0.965

54

0.998

55

1.033

56

1.067

57

1.102

58

1.138

59

1.174

60

1.209

61

1.246

62

1.282

63

1.319

64

1.356

65

100

Resistance (k)
17.55 16.8 16.1 15.43 14.79 14.18 13.59 13.04 12.51 12 11.52 11.06 10.62 10.2 9.803 9.42 9.054 8.705 8.37 8.051 7.745 7.453 7.173 6.905 6.648 6.403 6.167 5.942 5.726 5.519 5.32 5.13 4.948 4.773 4.605 4.443 4.289 4.14

Voltage (15K/5V)
2.663 2.717 2.77 2.822 2.874 2.926 2.977 3.027 3.076 3.125 3.173 3.22 3.266 3.311 3.355 3.399 3.442 3.484 3.525 3.565 3.604 3.643 3.68 3.717 3.753 3.787 3.822 3.855 3.887 3.919 3.949 3.979 4.008 4.037 4.064 4.091 4.117 4.143

Voltage (15K/3.3V
1.758 1.793 1.828 1.863 1.897 1.931 1.965 1.998 2.03 2.063 2.094 2.125 2.155 2.185 2.215 2.243 2.272 2.299 2.326 2.353 2.379 2.404 2.429 2.453 2.477
2.5 2.522 2.544 2.565 2.586 2.607 2.626 2.646 2.664 2.682
2.7 2.717 2.734

MRCOOL®
18 19 20 21 22 23 24 25 26 27

27.39 26.17 25.01 23.9 22.85 21.85 20.9
20 19.14 18.32

2.11 2.166 2.222 2.278 2.334 2.389 2.445
2.5 2.555 2.61

1.393 1.429 1.466 1.503 1.54 1.577 1.614 1.65 1.686 1.722

DC INVERTER GEOTHERMAL HEAT PUMP

66

3.998

4.167

2.75

67

3.861

4.191

2.766

68

3.729

4.214

2.781

69

3.603

4.237

2.796

70

3.481

4.259

2.811

71

3.364

4.28

2.825

72

3.252

4.301

2.838

73

3.144

4.321

2.852

74

3.04

4.34

2.865

75

2.94

4.359

2.877

101

MRCOOL®

DC INVERTER GEOTHERMAL HEAT PUMP

5.2.3 Voltage list of 50 k discharge temperature sensors (including discharge air temperature sensor)

Temp. 
-30 -29 -28 -27 -26 -25 -24 -23 -22 -21 -20 -19 -18 -17 -16 -15 -14 -13 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7

Resistance (k) 911.56 853.66 799.98 750.18 703.92 660.93 620.94 583.72 549.04 516.71 486.55 458.4 432.1 407.51 384.51 362.99 342.83 323.94 306.23 289.61 274.02 259.37 245.61 232.67 220.5 209.05 198.27 188.12 178.65 169.68 161.02 153 145.42 138.26 131.5 126.17 119.08 113.37

Voltage (15K/5V)
0.054 0.058 0.062 0.066 0.07 0.075 0.079 0.084 0.089 0.095 0.101 0.107 0.113 0.12 0.127 0.134 0.142 0.15 0.158 0.167 0.176 0.186 0.196 0.206 0.217 0.228 0.24 0.252 0.265 0.278 0.292 0.307 0.322 0.337 0.353 0.367 0.387 0.405

Voltage (15K/3.3V

Temp. 

0.036

8

0.038

9

0.041

10

0.043

11

0.046

12

0.049

13

0.052

14

0.056

15

0.059

16

0.063

17

0.066

18

0.07

19

0.075

20

0.079

21

0.084

22

0.088

23

0.094

24

0.099

25

0.104

26

0.11

27

0.116

28

0.123

29

0.129

30

0.136

31

0.143

32

0.151

33

0.158

34

0.167

35

0.175

36

0.184

37

0.193

38

0.202

39

0.212

40

0.223

41

0.233

42

0.242

43

0.256

44

0.267

45

102

Resistance (k) 107.96 102.85 98.006 93.42 89.075 84.956 81.052 77.349 73.896 70.503 67.338 64.333 61.478 58.766 56.189 53.738 51.408 49.191 47.082 45.074 43.163 41.313 39.61 37.958 36.384 34.883 33.453 32.088 30.787 29.544 28.359 27.227 26.147 25.114 24.128 23.186 22.286 21.425

Voltage (15K/5V)
0.424 0.443 0.463 0.483 0.505 0.527 0.549 0.572 0.596 0.621 0.647 0.673
0.7 0.727 0.755 0.784 0.814 0.845 0.876 0.908 0.941 0.974 1.008 1.043 1.078 1.114 1.151 1.188 1.226 1.264 1.303 1.343 1.383 1.424 1.465 1.507 1.549 1.591

Voltage (15K/3.3V
0.28 0.292 0.306 0.319 0.333 0.348 0.362 0.378 0.393 0.41 0.427 0.444 0.462 0.48 0.499 0.518 0.537 0.558 0.578 0.599 0.621 0.643 0.665 0.688 0.711 0.735 0.759 0.784 0.809 0.835 0.86 0.886 0.913 0.94 0.967 0.994 1.022 1.05

MRCOOL®
Temp. 
45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87

Resistance (k)
21.425 20.601 19.814 19.061 18.34 17.651 16.99 16.358 15.753 15.173 14.618 14.085 13.575 13.086 12.617 12.368 11.736 11.322 10.925 10.544 10.178 9.8269 9.4896 9.1655 8.9542 8.5551 8.2676 7.9913 7.7257 7.4702 7.2245 6.9882 6.7608 6.542 6.3315 6.1288 5.9336 5.7457 5.5647 5.3903 5.2223 5.0605 4.9044

Voltage (15K/5V)
1.591 1.634 1.677 1.721 1.764 1.808 1.853 1.897 1.942 1.986 2.031 2.076 2.121 2.166 2.211 2.235
2.3 2.345 2.389 2.434 2.478 2.522 2.565 2.609 2.638 2.695 2.737 2.779 2.821 2.862 2.903 2.943 2.983 3.023 3.062
3.1 3.138 3.175 3.212 3.249 3.285 3.32 3.355

Voltage (15K/3.3V
1.05 1.078 1.107 1.136 1.164 1.193 1.223 1.252 1.281 1.311 1.34 1.37
1.4 1.429 1.459 1.475 1.518 1.548 1.577 1.606 1.635 1.664 1.693 1.722 1.741 1.778 1.806 1.834 1.862 1.889 1.916 1.943 1.969 1.995 2.021 2.046 2.071 2.096 2.12 2.144 2.168 2.191 2.214

DC INVERTER GEOTHERMAL HEAT PUMP

Temp. 
88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130

Resistance (k)
4.7541 4.6091 4.4693 4.3345 4.2044 4.0789 3.9579 3.841 3.7283 3.6194 3.5143 3.4128 3.3147
3.22 3.1285 3.0401 2.9547 2.8721 2.7922 2.715 2.6404 2.5682 2.4983 2.4308 2.3654 2.3021 2.2409 2.1816 2.1242 2.0686 2.0148 1.9626 1.9123 1.8652 1.8158 1.7698 1.7253 1.6821 1.6402 1.5996 1.5602 1.522 1.485

Voltage (15K/5V)
3.389 3.423 3.456 3.488 3.52 3.551 3.582 3.612 3.642 3.671
3.7 3.728 3.755 3.782 3.809 3.834 3.86 3.884 3.909 3.932 3.956 3.978 4.001 4.022 4.044 4.064 4.085 4.105 4.124 4.143 4.162 4.18 4.197 4.214 4.232 4.248 4.264 4.28 4.295 4.31 4.325 4.34 4.354

Voltage (15K/3.3V
2.237 2.259 2.281 2.302 2.323 2.344 2.364 2.384 2.404 2.423 2.442 2.46 2.478 2.496 2.514 2.531 2.547 2.564 2.58 2.595 2.611 2.626 2.64 2.655 2.669 2.682 2.696 2.709 2.722 2.734 2.747 2.759 2.77 2.781 2.793 2.804 2.814 2.825 2.835 2.845 2.855 2.864 2.873

103

MRCOOL®

DC INVERTER GEOTHERMAL HEAT PUMP

6 Operation Tools
The following tools will be used: 1) Liquid-level gauge; 2) Screwdriver; 3) Electric driven rotary hammer; 4) Drill; 5) Pipe expander; 6) Torque wrench; 7) Open-end wrench; 8) Pipe cutter; 9) Leak detector; 10) Vacuum pump; 11) Pressure gauge; 12) Universal meter; 13) Hexagon wrench; 14) Tapeline.

104


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