White-Rodgers 1E78 Non Programmable Heat Only Thermostat User Manual

White-Rodgers 1E78 Non Programmable Heat Only Thermostat

Product Information

Specifications

• Product Name: Non-Programmable Heat Only Thermostat
• Model: 1E78

Thermostat Details
The thermostat consists of three main parts:

1. The cover may be either a snap-on or hinge type.
2. The base, which is removed by loosening all captive screws.
3. The switching subbase, which is removed by unscrewing the mounting screws that hold it on the wall or adaptor plate.

Mouting and Wiring
Before starting the installation process, please ensure that the electricity to the system is turned off at the main fuse box. Failure to do so may result in electrical shock or equipment damage.

Follow these steps to mount and wire the thermostat:

1. Remove the front cover of the old thermostat. If there is a wall mounting plate, remove the thermostat and the wall mounting plate as an assembly.
2. Identify each wire attached to the old thermostat using the labels enclosed with the new thermostat.
3. Disconnect the wires from the old thermostat one at a time. Make sure not to let the wires fall back into the wall.
4. Install the new thermostat using the following procedures:
5. Mounting: Securely mount the base of the new thermostat to the wall or adaptor plate using appropriate screws.
6. Wiring: Connect each wire to its corresponding terminal on the new thermostat, following the labels provided. Ensure that the wires are securely fastened.

Check Thermostat Operation
After completing the mounting and wiring process, follow these steps to check the thermostat operation:

1. Turn on the electricity at the main fuse box.
2. Observe the display on the thermostat to ensure it is functioning properly.
3. Set the desired temperature and verify that the heating or cooling system responds accordingly.

FAQ

• Q: Can I use this thermostat on circuits exceeding the specified voltage?
  A: No, using this thermostat on circuits exceeding the specified voltage can cause damage to the control and pose a shock or fire hazard.

• Q: What should I do if the wires fall back into the wall during the installation process?
  A: If the wires fall back into the wall, you may need to retrieve them using a wire fishing tool or seek assistance from a professional electrician to safely retrieve and reconnect the wires.

YOUR THERMOSTAT REPLACES

PREPARATIONS

Assemble tools required as shown below.

Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and/or property damage.

THERMOSTAT DETAILS

Figure 1. Thermostat

NOTE: Earlier models refer to 37-7006 for jumper locations.

REMOVING OLD THERMOSTAT

CAUTION
To prevent electrical shock and/or equipment damage, disconnect electric power to the system at the main fuse or circuit breaker box until installation is complete.

Before removing wires from the old thermostat’s switching subbase, label each wire with the terminal designation it was removed from.

1. Remove Old Thermostat: A standard heat/cool thermostat consists of three basic parts:
   • The cover may be either a snap-on or hinge type.
   • The base, which is removed by loosening all captive screws.
   • The switching subbase, which is removed by unscrewing the mounting screws that hold it on the wall or adaptor plate.
2. Shut off electricity at the main fuse box until installation is complete. Ensure that electrical power is disconnected.
3. Remove the front cover of the old thermostat. With wires still attached, remove the wall plate from the wall. If the old thermostat has a wall mounting plate, remove the thermostat and the wall mounting plate as an assembly.
4. Identify each wire attached to the old thermostat using the labels enclosed with the new thermostat.
5. Disconnect the wires from the old thermostat one at a time. DO NOT LET WIRES FALL BACK INTO THE WALL.
6. Install a new thermostat using the following procedures.

ATTENTION!
This product does not contain mercury. However, this product may replace a unit that contains mercury.

• Do not open mercury cells. If a cell becomes damaged, do not touch any spilled mercury. Wearing non-absorbent gloves, take up the spilled mercury and place it into a container that can be sealed. If a cell becomes damaged, the unit should be discarded.
• Mercury must not be discarded in household trash. When the unit this product is replacing is to be discarded, place in a suitable container. Refer to www.white-rodgers.com for a location to send products containing mercury.

MOUNTING AND WIRING

WARNING

• Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazards.
• Do not short out terminals on gas valve or primary control to test. Short or incorrect wiring will damage the thermostat and could cause personal injury and/or property damage.
• Thermostat installation and all components of the system shall conform to Class II circuits per the NEC code.

Hydronic (Hot Water or Steam) Heating Systems
This thermostat is set to operate properly with a forced-air heating system. If you have a hydronic heating system (a system that heats with hot water or steam), you must set the thermostat to operate properly with your system. The factory default setting is forced air heat. Clipping jumper W905 on the circuit board will produce a longer heating cycle which is normal for hot water or steam (hydronic) systems. Both settings produce a very accurate temperature control and can be set to your personal preference. As received, the thermostat cycles the system just under 1°F. With W905 clipped, the system cycles at approximately 1.5°F.

CAUTION
Take care when securing and routing wires so they do not short to adjacent terminals or the rear of the thermostat. Personal injury and/or property damage may occur.

TERMINAL CROSS-REFERENCE CHART

New Thermostat Terminal Designation

• RH
• W

Other Manufacturers’ Terminal Designation

• 4 W
• RH W
• M W

Attach Thermostat Base to Wall

1. Remove the packing material from the thermostat. Gently pull the body straight off the base. Forcing or prying on the thermostat will cause damage to the unit.
2. Connect wires beneath terminal screws on the base using appropriate wiring schematic (see fig. 2).
3. Place the base over the hole in the wall and mark mounting hole locations on the wall using the base as a template.
4. Move the base out of the way. Drill mounting holes.
5. Fasten the base loosely to the wall, as shown in fig. 1, using two mounting screws. Adjust until level, and then tighten screws. (Leveling is for appearance only and will not affect thermostat operation.) If you are using existing mounting holes, or if the holes drilled are too large and do not allow you to tighten the base snugly, use plastic screw anchors to secure subbase.
6. Push excess wire into the wall and plug the hole with a fire-resistant material (such as fibreglass insulation) to prevent drafts from affecting thermostat operation.

Battery Location
This thermostat requires 2 “AAA” alkaline batteries to operate.

If appears on the display, the batteries are low and should be replaced with fresh “AAA” Energizer® alkaline batteries. The batteries are located on the back of the thermostat body (see fig. 1).

Figure 2. Typical wiring diagram for heat only, 2-wire, single transformer systems

CHECK THERMOSTAT OPERATION

NOTE
To prevent static discharge problems, touch the side of the thermostat to release static build-up before touching any keys.

If at any time during testing your system does not operate properly, contact a qualified service person.

Heating System

1. Move the SYSTEM switch to the HEAT position. If the heating system has a standing pilot, be sure to light it.
2. Press to adjust the thermostat setting above room temperature. The heating system should begin to operate.
3. Press to adjust the temperature setting below room temperature. The heating system should stop operating.

Before you begin using your thermostat, you should be familiar with its features with the display and the location and operation of the thermostat buttons. Your thermostat consists of two parts: the thermostat body and the base. To remove the body, gently pull it straight out from the base. To replace the body, line up the body with the base and press gently until the body snaps onto the base.

The Thermostat Buttons and Switches

1. (Up arrow) Raises temperature setting.

2. (Down arrow) Low temperature setting.

3. SYSTEM switch (OFF, HEAT).
   The Display

4. is displayed when the SYSTEM switch is in the HEAT position.

5. Displays current temperature.

6. is displayed when the 2 “AAA” batteries are low and should be replaced. Nothing else will be displayed. Earlier models display “LO BATTERY”. Refer to 37-7006.

7. Displays currently set temperature (this is blank when the SYSTEM switch is in the OFF position).

Operating Features

Now that you are familiar with the thermostat buttons and display, read the following information to learn about the many features of the thermostat.

• TEMPERATURE SETTING — Press or until the display shows the temperature you want. The thermostat will keep the room temperature at the selected temperature.
• °F/°C CONVERTIBILITY — The factory default setting is Fahrenheit. Clipping the W904 jumper on the circuit board (see fig. 1) will alter this feature to the Celsius temperature setting.
• LOW BATTERY INDICATOR — If the 2 “AAA” alkaline batteries are low and should be replaced, the display will be blank except for. When the batteries are low, pressing any button will cause the display to operate for ten seconds. After ten seconds, the display will be blank except for. After has been displayed for 4 weeks, the thermostat will drop the temperature by 10° below your setpoint in HEAT mode. You cannot program with low batteries but you can override setpoint temperature.
• TEMPERATURE DISPLAY ADJUSTMENT — Your new thermostat has been accurately set in our factory. However, if you wish, you may adjust your new thermostat temperature display to match your old thermostat. This can be accomplished (within a ±3° range) as follows:

1. Press and at the same time for two seconds with the SYSTEM switch in the OFF position.
2. Press or to adjust the displayed temperature to your desired setting.
3. Move the SYSTEM switch from OFF to exit the feature.

• DISPLAY BACKLIGHT — The display backlight improves display contrast in low-lighting conditions. Selecting the backlight ON will turn the light on for a short time after any button is pressed. Selecting the backlight OFF (default) will keep the light off. Turn the display backlight feature ON as follows:

1. Press and at the same time for two seconds with the SYSTEM switch in the HEAT position. The display will alternately show “-L” AND “FF” (off).
2. Press or to change “FF” to “ON”.
3. Move the SYSTEM switch to OFF to exit the feature.

SPECIFICATIONS

ELECTRICAL DATA

• Electrical Rating:
  • 0 to 30 VAC 50/60 Hz. or D.C.
  • 0.05 to 1.0 Amps (Load per terminal)
  • 1.5 Amps Maximum Total Load (All terminals combined)

THERMAL DATA

• Setpoint Temperature Range: 45°F to 90°F (7°C to 32°C)
• Operating Ambient Temperature Range: 32°F to 105°F
• Operating Humidity Range: 0 to 90% RH (non-condensing)
• Shipping Temperature Range: -40°F to 150°F

TROUBLESHOOTING

Reset Operation
If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation you can reset the thermostat by pressing and at the same time moving the SYSTEM switch from OFF to HEAT. This also resets the factory defaults. If the thermostat has power, has been reset and still does not function correctly contact your heating/cooling service person or place of purchase.

Batteries
For optimum performance, we recommend replacing batteries once a year with fresh “AAA” Energizer® alkaline batteries.

No Heat

(common problems)

| 1.     Blown fuse or tripped circuit breaker.

2.     Furnace power switch to OFF.

3.     Furnace blower compartment door or panel loose or not properly installed.

| Replace the fuse or reset the breaker. Turn the switch to ON.

Replace the door panel in the proper position to engage the safety interlock or door switch.

No Heat| 1.     Pilot light not lit.

2.     SYSTEM Switch not set to HEAT.

3.     Loose connection to thermostat or system.

4.     Furnace Lock-Out Condition. Heat may also be intermittent.

5. The heating system requires service or the thermostat requires replacement.

| Re-light pilot.

Set the SYSTEM Switch to HEAT and raise the temperature above room temperature. Verify thermostat and system wires are securely attached.

Many furnaces have safety devices that shut down when a lock-out condition occurs. If the heat works intermittently contact the furnace manufacturer or local service person for assistance.

Diagnostic: Set the SYSTEM Switch to HEAT and raise the setpoint above room temperature. Within a few seconds, the thermostat should make a soft- click sound. This sound usually indicates the thermostat is operating properly. If the thermostat does not click, try the reset operation listed above. If the thermostat does not click after being reset contact your heating and cooling service person or place of purchase for a replacement. If the thermostat clicks, contact the furnace manufacturer or a service person to verify the heating is operating correctly.

Heat, Runs Constantly| 1.     Possible short in wiring.

2.     Possible short in thermostat.

3.     Possible short in heat system.

| Check each wire connection to verify they are not shorted or touching together. No bare wire should stick out from under terminal screws. Try resetting the thermostat as described above. If the condition persists the manufacturer of your system or service person can instruct you on how to test the Heat system for correct operation. If the system operates correctly, replace the thermostat.
Furnace Cycles Too Fast or Too Slow (narrow or wide temperature swing)| 1. The location of the thermostat and/or the size of the Heating System may be influencing the cycle rate.| Digital thermostats normally provide precise temperature control and may cycle faster than some older mechanical models. A faster cycle rate means the unit turns on and off more frequently but runs for a shorter time so there is no increase in energy use. If you would like to increase the cycle time, clip Jumper W-905 as mentioned in the instructions for Hydronic Heating Systems. It is not possible to shorten the cycle time. If an acceptable cycle rate is not achieved as received or by clipping W-905 contact a local service person for additional suggestions.
Thermostat Setting and Thermostat Thermometer Disagree| 1. The thermostat thermometer setting requires adjustment.| The thermometer can be adjusted +/- 3 degrees. See Temperature Display Adjustment in the Operation section.
Blank Display and/or Keypad Not Responding| 1.     Voltage spike or static discharge.

2.     Battery change required.

| Replace batteries and check the heat/cooling system for proper operation. If a voltage spike occurs use the Reset Operation listed above.

Homeowner Help Line: 1-800-284-2925

White-Rodgers is a division of Emerson Electric Co. The Emerson logo is a trademark and service mark of Emerson Electric Co.

• www.white-rodgers.com
• www.emersonclimate.com.

References

• Copeland is Engineered for Sustainability | Copeland US
• White-Rodgers Brand | Copeland US
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