mc-gis-sm-en-01
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-manualGeoCool® 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. 1 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. 2 MRCOOL® 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 3 MRCOOL® 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. 4 MRCOOL® 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. 5 MRCOOL® 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. 6 MRCOOL® 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 7 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. 8 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. 9 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 10 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 11 MRCOOL® 4.2.2 Wiring Diagrams of A-Coil Module Model: GCSCAM048GN / GCSCAM060GN DC INVERTER GEOTHERMAL HEAT PUMP 12 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 15 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. 16 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 17 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 18 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. 19 MRCOOL® 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. 20 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. 21 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 22 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 23 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 24 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 25 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 26 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 27 MRCOOL® 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 28 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 29 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 30 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 31 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 32 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 33 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 34 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 35 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 36 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 37 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 38 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 39 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 40 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 41 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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. 42 MRCOOL® 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 43 MRCOOL® 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, 44 MRCOOL® 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. 45 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 46 MRCOOL® 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. 47 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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. 48 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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. 49 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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. 50 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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. 51 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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. 52 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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. 53 MRCOOL® 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. 54 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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? 55 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP (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 56 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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. 57 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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. 58 MRCOOL® 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. 59 MRCOOL® 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. 60 MRCOOL® 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. 61 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 62 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 ) 63 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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) 64 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 65 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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) 66 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) MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 67 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 68 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 69 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 70 MRCOOL® DC INVERTER GEOTHERMAL HEAT PUMP 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 71 MRCOOL® Step DC INVERTER GEOTHERMAL HEAT PUMP 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 72 MRCOOL® Step DC INVERTER GEOTHERMAL HEAT PUMP 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 73 MRCOOL® Step DC INVERTER GEOTHERMAL HEAT PUMP 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 74 MRCOOL® Step DC INVERTER GEOTHERMAL HEAT PUMP 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 75 MRCOOL® 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. 76 MRCOOL® Step DC INVERTER GEOTHERMAL HEAT PUMP 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. 77 MRCOOL® Step DC INVERTER GEOTHERMAL HEAT PUMP 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. 78 MRCOOL® Step DC INVERTER GEOTHERMAL HEAT PUMP 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. 104Microsoft Word 2016