110-1086B 8400THERMOSTAT

110-1086B

Lisa Mosillo

Robertshaw Thermostat Instruction Manuals (All Models)

E G O H

8400THERMOSTAT - Robertshaw

THERMOSTAT ELECTRIC E GAS G OIL O NeW 1 Heat / 1 Cool User's Manual Quick Start Installation HEAT PUMP H Application The Robertshaw 8400 is a single-stage thermostat designed to control 24 VAC gas or electric heating and cooling systems or single-stage heat pump. Features • Low battery indicator • Large backlit display

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Document DEVICE REPORT8400 Thermostat manual 110-1086B

NeW

8400 DIGITAL NON-PROGRAMMABLE THERMOSTAT

G E OH

GAS

ELECTRIC

OIL HEAT PUMP

1 Heat / 1 Cool

User's Manual
Quick Start Installation

110-1086B
Application
The Robertshaw 8400 is a single-stage thermostat designed to control 24 VAC gas or electric heating and cooling systems or single-stage heat pump.
Features
· Low battery indicator · Large backlit display · Adjustable temperature differential: 1°F to 3.0°F (0.5°C to 1.5°C) · Compressor short cycle protection · Accuracy within ±1° · Zone system compatible as a master thermostat · Permanent memory retention · Fahrenheit/Celsius display option · Adjustable from 45°F to 90°F (7°C - 32°C) · Quick wire terminal block · Low temperature freeze protection. While in heat mode, the
thermostat will mechanically turn on the heat if the temperature drops to 40°F (4°C) even if the batteries are drained or missing.
1

! WARNING:
· Always turn off power at main fuse or circuit breaker panel before installing, removing, cleaning, or servicing thermostat.
· Read all the information in this manual before installing this thermostat.
· DO NOT CONNECT TO 120 VAC. This is a 24 VAC low-voltage thermostat. Do not install on voltages higher than 30 VAC.
· All wiring must conform to local and national building and electrical codes and ordinances.
· Do not short (jumper) across terminals on the gas valve or at the system control to test installation. This will damage the thermostat and void the warranty.
· Do not connect ground to any terminal in this unit.
Recycling Thermostat
If this thermostat REPLACES a thermostat that contains mercury, DO NOT discard the old thermostat in the regular trash. Mercury is harmful to humans and the environment. For this reason, do not open, break, or crush the mercury cell. If mercury leaks from a damaged cell, DO NOT touch or handle mercury with bare hands. Use protective, non-absorbent gloves to place mercury into a sealable container. Fill the container with sand or another absorbent material and seal the container completely.
Return the mercury or mercury products, in a sealed container, to Invensys Controls Americas or a local recycling center for proper disposal. If you have any questions, call Robertshaw technical support at 1-800-445-8299.
Invensys Controls Americas 28C Leigh Fisher Blvd. El Paso, TX 79906 Attn: Mercury Recycling Center

Step 1: Replacing Existing Thermostat

! WARNING:
In heat pump applications, do not connect anything to the W1 terminal. When switched to HP mode, W1 is connected internally to Y1 on the thermostat.
Wiring Table

Old Terminal
M,W,Rh,R5 or 5 V or Rc Y or Y6 H,W, or 4 F or G O B

New Label
Rh Rc Y1 W1 G O B

Description
Heat transformer, hot side Cool transformer, hot side Cooling control Heating control Fan control relay Cool active reversing valve Heat active reversing valve

NOTE: ON SOME OLDER MODELS, THE C TERMINAL CAN BE EITHER THE COOLING CONTROL OR THE COMMON SIDE OF THE TRANSFORMER. CHECK FURNACE WIRING DIAGRAM TO VERIFY C TERMINAL. IF IT IS THE COMMON SIDE OF THE TRANSFORMER, CAP THE WIRE AND TUCK INTO THE WALL. IF IT IS THE COOLING CONTROL, CONNECT TO THE Y TERMINAL.
2

1. Turn off power to heating and cooling system.
2. Remove cover from old thermostat to expose wires (Figure 1).
3. Disconnect wires one at a time from existing terminals. Use enclosed labels to mark existing wires. Refer to cross references in the Wiring Table if existing wiring does not directly match the labels.
4. Remove existing thermostat base from wall.

Figure 1
Step 2: Installing Model 8400 Thermostat
NOTE: FOR NEW INSTALLATIONS, MOUNT THERMOSTAT ON INSIDE WALL, FIVE FEET ABOVE THE FLOOR. DO NOT INSTALL BEHIND A DOOR, IN A CORNER, NEAR AIR VENTS, IN DIRECT SUNLIGHT, OR NEAR ANY HEAT OR STEAM GENERATING FIXTURES. INSTALLATION AT THESE LOCATIONS WILL AFFECT THERMOSTAT OPERATION.
1. Turn power off to the heating and cooling systems.
2. Place HEAT-OFF-COOL in OFF position (Figure 2).
3. Place AUTO-ON switch into AUTO position (Figure 2).

heat off cool

auto on
°F

heat off cool
Figure 2

auto on
°F

4. Remove the cover using a coin or screwdriver (Figure 3). Set aside.

heat off cool MON

auto on °F

rupnr/osget theomldp hvoalcd csloectk

Figure 3 5. Place thermostat against the wall at desired location. Make sure
wires will feed through opening (Figure 4) on base of thermostat.
Mounting Holes

°F

NON_HP HP

G O B Y1 W1 ELEC GAS

Figure 4
6. Mark placement of mounting holes (Figure 4). Set base aside.
7. If mounting on drywall, tap plastic anchors into wall. NOTE: Enclosed plastic anchors do not require a drilled hole for drywall.
8. If mounting on a surface other than drywall, drill the marked holes using a 3/16" (5mm) drill bit.
9. Align base with plastic anchors and feed wires through opening.
10. Secure base to wall with supplied screws. NOTE: The thermostat will mount horizontally on a single gang junction box.
11. Strip end of wires 5/16" (8mm) if needed.
12. Terminal screws are already loose and ready for wire insertion. Insert wires into terminal strip (Figure 4) matching the label to the corresponding terminal (see Wiring Diagrams). Tighten screws.

Wiring Diagrams

HEAT/COOL 4-WIRE
SINGLE TRANSFORMER
Factory-Installed Jumper

Transformer

Hot 120 VAC

24 VAC

RH
T

RC H E

Heating Control

W1 R M

Cooling Control

O Y1 S

Fan Control

T GA
T
O

HEAT ONLY 3-WIRE
SINGLE TRANSFORMER
Factory-Installed Jumper

Transformer

Hot

120 VAC

24 VAC

RH T

RC H E

Heating Control

W1 R M

O Y1 S

Fan Control

T
G
A

T
O

HEAT ONLY 2-WIRE
SINGLE TRANSFORMER

Transformer

Hot

120 VAC

24 VAC

Heating Control

RH
T
RC
H E
W1
R Y1 M
O GS
T
O
A BT

COOL ONLY 3-WIRE
SINGLE TRANSFORMER
NOTE: Remove factory installed jumper

Transformer

Hot

120 VAC

24 VAC

Cooling Control
Fan Control

RH
T
RC
H W1 E
R Y1 M
O GS
T OA BT

Wiring Diagrams

HEAT/COOL 5-WIRE
TWO TRANSFORMER

(HEATING) Transformer

Hot

120 VAC

24 VAC

Hot 120 VAC

24 VAC

(COOLING) Transformer

Heating Control
Cooling Control
Fan Relay

RH
T

W1 R

Y1 O

NOTE: Disconnect factory installed jumper.
CAUTION: Both transformers must be in phase or damage to the equipment and thermostat may result.

HEAT PUMP WITH
COOL ACTIVE REVERSING VALVE

Transformer

Hot 120 VAC

24 VAC

RH
T

W1 R

Compressor

Contactor

Fan Relay

Reversing O

Valve

NOTE: Make sure the HP switch is in the HP position. When switched to HP mode, W1 is connected internally to Y1.

HEAT PUMP WITH
HEAT ACTIVE REVERSING VALVE

Transformer

Hot

120 VAC

24 VAC

RH
T

W1 R

Compressor

Contactor

Fan Relay

Reversing

Valve

NOTE: Make sure the HP switch is in the HP position When switched to HP mode, W1 is connected internally to Y1.

NOTE: Factory Installed Jumper
NOTE: Factory Installed Jumper

TERMINAL LEGEND - 8400

TERM EQUIPMENT TO CONNECT

REQ? TERMINAL FUNCTION

Rh 24VAC hot connection

Yes For input of 24VAC hot side of heat transformer

Rc 24VAC hot connection

Yes For input of 24VAC hot side of cool transformer

W1 Heat connection

Yes* Energizes on a call for heating

Y1 Compressor Connection

Yes* Energizes on a call for cooling

B Heat active reversing valve** No Energizes when in the HEAT mode

O Cool active reversing valve** No Energizes when in the COOL mode

G Indoor fan connection

Yes Energizes with Y1 & W1 terminals or with FAN option switched to the ON position

* This thermostat can be used as a heat only or cool only thermostat. Therefore it is not always necessary to use both Y and W.
**The O and B terminals are accessory terminals that typically are used for heat pump applications.

°F

Correct battery placement

NON_HP HP

G O B Y1 W1 ELEC GAS

ELECTRIC/GAS SWITCH Selects fan control.

HP OPTION SWITCH Heat pump switch.

Figure 5

13. Make sure wire connections are secure.
14. Push excess wire back through opening.
15. Set the Electric/Gas switch to either GAS for a gas/oil heating system or ELEC for an electric heating system (Figure 5).
16. Set the HP option switch to either the HP for heat pump or NON_HP for furnace applications (Figure 5).
17. Install two AA Energizer brand batteries or equivalent into battery compartment as shown (Figure 5).
18. Replace thermostat cover by snapping into place.

Step 3: Testing the Thermostat
! WARNING: DO NOT SHORT (JUMPER) ACROSS TERMINALS OF GAS
VALVE OR SYSTEM CONTROL TO TEST OPERATION. THIS WILL DAMAGE THE THERMOSTAT AND VOID YOUR WARRANTY.

CAUTION: DO NOT SWITCH SYSTEM TO COOL OR LEAVE IN COOL MODE IF THE TEMPERATURE IS BELOW 50°F (10°C). THIS CAN DAMAGE THE AIR CONDITIONING SYSTEM AND CAUSE PERSONAL INJURY.

1. Place the HEAT-OFF-COOL switch into the COOL position. The will be displayed.

2. Press the button until the temperature setting is at least 3 degrees below the room temperature. The air conditioning system should turn on within a few seconds.

heat off cool

NOTE: ONCE THE THERMOSTAT TURNS OFF WHEN IN THE COOL MODE, A BUILT IN 5-MINUTE DELAY PREVENTS THE SYSTEM FROM TURNING ON AGAIN. THIS PROTECTS THE COMPRESSOR. NO ADDITIONAL TIME DELAY RELAY IS REQUIRED. TO OVERRIDE THE 5-MINUTE DELAY FOR INSTALLATION, PRESS THE RESET BUTTON.

3. Put the HEAT-OFF-COOL switch into the OFF position. The air conditioning system should turn off.

heat off cool

4. Put the HEAT-OFF-COOL switch into the HEAT position. The will be displayed.

5. Press the button until the temperature

heat off cool

setting is at least 3 degrees above room

temperature. The heating system should turn on. The fan may

not turn on immediately, depending on the fan delay built into

the furnace.

NOTE: If HP is selected, the heat will not come on until the 5 minute short cycle protection has expired.

6. Put the HEAT-OFF-COOL switch into the OFF position. The heating system should turn off. The fan may continue to run for a short period of time.
7. Put the AUTO-ON switch into the ON position. The blower fan should turn on. The display will show a .
8. Put the AUTO-ON switch into the AUTO position. The blower fan should turn off.

heat off cool auto on

auto on
8

Step 4: Customizing the Thermostat

Settings
System Cool: The thermostat controls the cooling. Off: The heating and cooling systems are off. Heat: The thermostat controls the heat.
Fan Auto: Equipment controls the fan. On: The fan operates continuously.

Temperature Differential
The temperature differential is factory set at 1.0°F (.5°C). This means that whenever the room temperature changes by one degree Fahrenheit from the temperature setting, the system will turn on. If the system turns on too often, increase the temperature differential.

Changing Fahrenheit (°F) to Celsius (°C), the Temperature Differential, and
the Filter Monitor

1. The thermostat is preset to display the temperature in degrees Fahrenheit (US models) or degrees Celsius (Canadian models). The temperature display can be changed. Press and hold both the and buttons for three seconds. The display will flash either an F or C. Release buttons. Press the or button to switch the display.

2. Wait five seconds or press and the display will switch to the differential setting.

3. The display will read diFF. The temperature differential is factory set at 1.0°F (0.5°C). Press the or button to adjust the differential up or down.

4. Wait five seconds or press display will switch to the filter monitor setting.

and the

5. CHECK FILTER and the length of hours for the filter monitor will be displayed.

6. Use the or to adjust the filter timer from 0 (OFF) to 9900 hours. NOTE: The filter timer is based on equipment run time. Select the length of time based on the recommended service interval for your filter.

7. Press the to return to normal operation.

Check Filter Reset
Once the filter timer has expired, CHECK FILTER will turn on and stay on. To clear the message and reset the timer: 1. Press the and buttons and hold
for 3 seconds. CLr will appear in the time display. 2. Press any key to clear the message. The display will transition to the temperature scale display as described in the previous section. 3. No further input is needed. Within a few seconds, the display will return to the normal operating mode.
Backlit Display
This thermostat is equipped with a backlight to make night time temperature adjustments quick and easy. Press the button to activate the backlight. The backlight will turn off after about 10 seconds of inactivity.
Reset
To reset the thermostat press the RESET button located above the upper left corner of the display.

RESET switch

°F

NON_HP HP

G O B Y1 W1 ELEC GAS

Step 5: Troubleshooting

Symptom

Remedy

Thermostat does not turn on system. Check wiring (see Installation section).

Thermostat turns system on and off too frequently.
Display is blank, flashing or constant LOW BATT.

Increase temperature differential (see Changing the Temperature Differential section).
Replace batteries.

System fan does not operate properly.
Thermostat does not display proper room temperature.

Move Electric/Gas switch to either electric or gas, to match system (see Installation section).
Check F/C (Fahrenheit/Celsius) setting. See Changing Fahrenheit (F) to Celsius (C).

Note: Although the thermostat has a low battery indicator, replace the batteries once a year to prevent leakage and to prevent the thermostat and heat/cooling system from shutting down due to lack of battery power in the thermostat.

If problems with thermostat cannot be resolved, call: Technical Support: (800) 445-8299
Monday-Friday 7:30 AM - 5:30 PM CST
For after hours service, a 24-hour automated help line is available.

Two Year Limited Warranty
Invensys Controls Americas warrants to the original contractor installer, or to the original consumer user, each new Robertshaw thermostat to be free from defects in materials and workmanship under normal use and service for a period of two (2) years from date of purchase. This warranty and our liability does not apply to batteries or merchandise that has been damaged by misuse, neglect, mishandling, alterations, improper installation, or use in a way other than in accordance with Invensys Controls Americas recommendations and instructions.
Invensys Controls Americas agrees to repair or replace at its option any thermostat under warranty provided it is returned within the warranty period, postage prepaid, with proof of the date of purchase. Cost of thermostat removal or reinstallation is not the responsibility of Invensys Controls Americas.
Repair or replacement as provided under this warranty is the exclusive remedy of the consumer. Invensys Controls Americas shall not be liable for any incidental or consequential damages for breach of any express or implied warranty on this product, or under any other theory of liability. Except to the extent prohibited by applicable law, any implied warranty of merchantability or fitness for a particular purpose on this product is limited to the duration of this warranty. Some states do not allow the exclusion or limitation of incidental or consequential damages, or allow limitations on how long an implied warranty lasts, so the above limitations or exclusions may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
For warranty returns, send thermostat, shipping prepaid to: Invensys Controls Americas Warranty Claims Department 515 S. Promenade Corona, CA 92879-1736

Controls Americas 191 E. North Avenue Carol Stream, Illinois 60188 United States of America
©2005 Invensys Controls Americas
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110-1086B

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