EMERSON White-Rodgers 1E78 Non-Programmable Thermostat Installation Instructions

EMERSON White-Rodgers 1E78 Non-Programmable Thermostat

YOUR THERMOSTAT REPLACES

Typical System Compatibility Chart	1E78
Standard Heat Only Two Wire Gas or Oil Fired Systems (24 volt)	Yes
Electronic Ignition Heat Only Two Wire Systems (24 volt)	Yes
Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt)	Yes
Standard Heat/Cool Systems (24 volt)	Yes
Heat/Cool Systems Electric Heat (24 volt)	Yes
Heat Only Electric Heat Systems (24 volt)	Yes
Cool Only Systems (24 volt)	Yes
Heat Pump Systems (No Aux or Emergency Heat)	Yes
Hot Water Zone Heat Only (Two Wire) Systems	Yes
Hot Water Zone Heat Only (Three Wire) Systems	No
Line Voltage Heating or Baseboard 110/240 Volt Systems	No
Millivolt Systems Floor or Wall Furnaces	Yes
12 VDC Mobile Home Application	Yes
Multistage Systems	No
Systems Exceding 30VAC, 1.5 Amp	No

PREPARATIONS

Assemble tools required as shown below.

THERMOSTAT DETAILS

REMOVING OLD THERMOSTAT

CAUTION

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

Before removing wires from 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, 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 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 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 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 and return to White-Rodgers at 2895 Harrison Street, Batesville, AR 72501-2117 for proper disposal.

MOUNTING AND WIRING

WARNING
Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard.
Do not short out terminals on gas valve or primary control to test. Short or incorrect wiring will damage 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.

ELECTRIC HEAT OR SINGLE-STAGE
HEAT PUMP SYSTEMS
This thermostat is configured from the factory to operate a heat/ cool, fossil fuel (gas, oil, etc.), forced air system. It is configured correctly for any system that DOES NOT require the thermostat to energize the fan on a call for heat. If your system is an electric heat or heat-pump system that REQUIRES the thermostat to turn on the fan on a call for heat, locate the GAS/ELECTRIC switch on the back of the thermostat (see fig. 1) and switch it to the ELECTRIC position. This will allow the thermostat to energize the fan immediately on a call for heat. If you are unsure if the heating/cooling system requires the thermostat to control the fan, contact a qualified heating and air conditioning service person.

ATTACH THERMOSTAT BASE TO WALL

1. Remove the packing material from the thermostat. Gently pull the cover straight off the base. Forcing or prying on the thermostat will cause damage to the unit. If necessary, move the electric heat switch (see ELECTRIC HEAT SYSTEMS, above).
2. Connect wires beneath terminal screws on base using the appropriate wiring schematic (see figs. 2 through 7).
3. Place base over hole in wall and mark mounting hole locations on wall using base as a template.
4. Move base out of the way. Drill mounting holes.
5. Fasten base loosely to wall, as shown in fig. 1, using two mounting screws. Place a level against bottom of base, 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 holes drilled are too large and do not allow you to tighten base snugly, use plastic screw anchors to secure subbase.
6. Push excess wire into wall and plug hole with a fire-resistant material (such as fiberglass insulation) to prevent drafts from affecting thermostat operation.

BATTERY LOCATION
2 “AA” alkaline batteries are included in the thermostat at the factory with a battery tag to prevent power drainage. You must remove the battery tag to engage the batteries. If “LO BATTERY” is displayed, the batteries are low and should be replaced. For best results, replace all batteries with new premium brand alkaline batteries such as Duracell® or Energizer®. To replace batteries, install the batteries along the top of the base (see Fig. 1). The batteries must be installed with the positive (+) end to the left.

CHECK THERMOSTAT OPERATION

If at any time during testing your system does not operate properly, contact a qualified service person.
Turn on power to the system.
Fan Operation
If your system does not have a G terminal connection, skip to Heating System.

1. Move the fan switch to the ON position. The blower should begin to operate.
2. Move the fan switch to the AUTO position. The blower should stop immediately.

Heating System

1. Move SYSTEM switch to the HEAT position. If the auxiliary heating system has a standing pilot, be sure to light it.
2. Press to adjust the thermostat setting to 1° above room temperature. The Heat Pump system should begin to operate. However, if the Flame icon () and Snowflake icon  are flashing, the compressor lockout feature is operating.
3. Adjust the temperature setting to 4° above room temperature. The auxiliary heat system should begin to operate and the Flame icon will be flashing.
4. Press to adjust the temperature setting below room temperature. The heating system should stop operating.
5. Before you begin using your thermostat, you should be familiar with its features and with the display and the location and operation of the thermostat buttons. Your thermostat consists of two parts: the thermostat cover and the base. To remove the cover, pull it straight out from the base. To replace the cover, line up the cover with the base and press until the cover snaps onto the base.
   

THE THERMOSTAT BUTTONS AND SWITCHES

1. 1. (Up arrow) Raises temperature setting.
   2. (Down arrow) Lowers temperature setting.
   3. FAN switch (ON, AUTO).
   4. SYSTEM switch (COOL, OFF, HEAT).
      THE DISPLAY
   5. The flame icon  is displayed when the SYSTEM switch is in the HEAT position. The flame icon  is displayed flashing when 2nd-stage heat (Aux or Emergency) is energized. The Snowflake icon is displayed (non-flashing) when the SYSTEM switch is in the COOL position. Snowflake and Flame are displayed (flashing) if the thermostat is in lockout mode to prevent the compressor from cycling too quickly.
   6. Displays current temperature.
   7. “LO BATTERY” is displayed when the 2 “AAA” batteries are low and should be replaced. Nothing else will be displayed.
   8. 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.

• SIMULTANEOUS HEATING/COOLING SETPOINT STORAGE — You can enter both your heating and cooling setpoints at the same time. There is no need to re-enter the thermostat at the beginning of each season.
• TEMPERATURE SETTING — Press 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 “LO BATTERY”. 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 “LO BATTERY”. After “LO BATTERY” has been displayed for 4 weeks, the thermostat will raise the temperature 10° above your setpoint in COOL mode and drop the temperature 10° below your setpoint in HEAT mode. You cannot program with low batteries, but you can override the 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:
  •  Press at the same time for two seconds with
    the SYSTEM switch in the OFF position.
  • Press to adjust the displayed temperature to your desired setting.
  •  Move the SYSTEM switch from OFF to exit the feature.
• DISPLAY BACKLIGHT— The display backlight improves display contrast in low-lighting conditions. Selecting backlight ON will turn the light on for a short period of time after any button is pressed. Selecting the backlight OFF (default) will keep the light off. Turn the display backlight feature ON as follows:
  • Press at the same time for two seconds with the SYSTEM switch in the HEAT position. The display will alternately show “-L” AND “FF” (off).
  • Press to change “FF” to “ON”.
  • Move the SYSTEM switch to OFF to exit the feature.

SPECIFICATIONS

ELECTRICAL DATA

• Electrical Rating: 20 to 30 VAC 50/60 Hz.
  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 TIME at the same time. 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 best results, replace batteries once a year with new premium brand alkaline batteries such as Duracell® or Energizer®.

Symptom	Possible Cause	Corrective Action
No Heat/No Cool/No Fan (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.   Heating system requires service or 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. Diagonistic: Set 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.
No Cool	1.   SYSTEM Switch not set to COOL   2.  Loose connection to thermostat or system.   3.   Cooling system requires service or thermostat requires replacement.	Set SYSTEM Switch to COOL and lower temperature below room temperature. Verify thermostat and system wires are securely attached. Same procedure as diagnostic for No Heat condition except set the thermostat to COOL and lower the setpoint below the room temperature. There may be up to a five minute delay before the thermostat clicks in Cooling.

Symptom	Possible Cause	Corrective Action
Heat, Cool or Fan Runs Constantly.	1.   Possible short in wiring. 2.   Possible short in thermostat. 3.   Possible short in heat/cool/fan system. 4.   FAN Switch set to Fan ON.	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/Cool 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.
Cooling Cycles Too Fast or Too Slow (narrow or wide temperature swing)	1. The location of the thermostat and the size of the Cooling System can influence the cycle rate.	The cycle rate for cooling is fixed and can not be adjusted. Contact a local service person for suggestions.
Thermostat Setting and Thermostat Thermometer Disagree	1. 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 heat/cool system for proper operation. If a voltage spike occurs use the Reset Operation listed above.

REFERENCE:

Download Manual: EMERSON White-Rodgers 1E78 Non-Programmable Thermostat Installation Instructions

EMERSON White-Rodgers 1E78 Non-Programmable Thermostat Installation Instructions