Robertshaw 8400 User Manual

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DIGITAL NON-PROGRAMMABLE THERMOSTAT

400

ELECTRIC

GAS

OIL

NeW

1 Heat / 1 Cool

User's Manual

Quick Start Installation

HEAT PUMP

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.

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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 New Label Description

M,W,Rh,R5 or 5 Rh Heat transformer, hot side

V or Rc Rc Cool transformer, hot side

Y or Y6 Y1 Cooling control

H,W, or 4 W1 Heating control

F or G G Fan control relay

O O Cool active reversing valve

B B 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.

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1. Turn off power to heating and cooling system.

heat off cool

auto on

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

Figure 2

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

auto on

at off cool

set

vac

clock

tem

hold

run/set

prog

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

–

+ –

GOB Y1W1

ELEC GAS

NON_HP HP

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.

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♦ Wiring Diagrams

HEAT/COOL

4-WIRE

SINGLE TRANSFORMER

Factory-Installed

Jumper

Transformer

120 VAC

Hot

24 VAC

Heating Control

Cooling Control

Fan

Control

T H

E R

M O

S T

A T

HEAT ONLY

2-WIRE

SINGLE TRANSFORMER

120 VAC

Transformer

Hot

24 VAC

Heating Control

H E

M O

S T

A T

HEAT ONLY

3-WIRE

SINGLE TRANSFORMER

Factory-Installed

Jumper

120 VAC

Transformer

Hot

24 VAC

Heating Control

Fan

Control

COOL ONLY

3-WIRE

SINGLE TRANSFORMER

NOTE: Remove factory installed jumper

Cooling Control

Fan

Control

120 VAC

Transformer

Hot

24 VAC

T H E R M O S

T A

R M O S

T A

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♦ Wiring Diagrams

HEAT/COOL

5-WIRE

TWO TRANSFORMER

(HEATING)

Transformer

Hot

120 VAC 24 VAC

Hot

120 VAC

24 VAC

(COOLING)

Transformer

HEAT PUMP WITH

COOL ACTIVE

REVERSING VALVE

Transformer

Hot

120 VAC

24 VAC

NOTE: Make sure the HP switch

is in the HP position. When switched to HP mode, W1 is connected internally to Y1.

Heating Control

Cooling Control

Fan

Relay

Compressor

Contactor

Fan

Relay

Reversing

Valve

NOTE: Disconnect factory installed jumper.

T H

CAUTION: Both transformers

must be in phase or damage to the equipment and thermostat

may result.

M O S

NOTE: Factory Installed Jumper

R M

S T

HEAT PUMP WITH

HEAT ACTIVE

REVERSING VALVE

Transformer

Hot

120 VAC

24 VAC

Compressor

Contactor

Reversing

NOTE: Make sure the HP switch

is in the HP position When switched to HP mode, W1 is connected internally to Y1.

Fan

Relay

Valve

NOTE: Factory Installed Jumper

T H

S T A

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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.

–

GOB Y1W1

ELECTRIC/GAS SWITCH Selects fan control.

ELEC GAS

NON_HP HP

+ –

HP OPTION SWITCH Heat pump switch.

Correct battery placement

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.

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Step 3: Testing the Thermostat

heat off cool

auto on

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

1. Place the HEAT-OFF-COOL switch into the

2. Press the button until the temperature

NOTE: ONCE THE THERMOSTAT TURNS OFF WHEN IN THE COOL MODE,

3. Put the HEAT-OFF-COOL switch into the OFF

4. Put the HEAT-OFF-COOL switch into the HEAT

5. Press the button until the temperature

NOTE: If HP is selected, the heat will not come on until the 5 minute

IF THE TEMPERATURE IS BELOW 50°F (10°C). THIS CAN DAMAGE THE AIR CONDITIONING SYSTEM AND CAUSE PERSONAL INJURY.

COOL position. The will be displayed.

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

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.

position. The air conditioning system should turn off.

position. The will be displayed.

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.

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.

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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 and the display will switch to the filter monitor setting.

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.

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♦ 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.

GOB Y1W1

ELEC GAS

NON_HP HP

–

+ –

RESET switch

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Step 5: Troubleshooting

Symptom Remedy

Thermostat does not turn on system.

Thermostat turns system on and off too frequently.

Display is blank, flashing or constant LOW BATT.

System fan does not operate properly.

Thermostat does not display proper room temperature.

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.

Check wiring (see Installation section).

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

Replace batteries.

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).

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.

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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