EasyManua.ls Logo

White Rodgers 1e+78 - User Manual

White Rodgers 1e+78
4 pages
Save Page as PDF
Print Icon
To Next Page IconTo Next Page
To Next Page IconTo Next Page
Loading...
Base
Back of
Thermostat Body
RC G RH
YOB
W
W905
W904
Mounting
Hole
Mounting
Hole
Figure 1. Thermostat
W904 - clip for Celcius display
W905 - clip for hydronic system
Heating & Air ConditioningHeating & Air Conditioning
Heating & Air ConditioningHeating & Air Conditioning
Heating & Air Conditioning
1E781E78
1E781E78
1E78
Non-Programmable Heat Only ThermostatNon-Programmable Heat Only Thermostat
Non-Programmable Heat Only ThermostatNon-Programmable Heat Only Thermostat
Non-Programmable Heat Only Thermostat
PART NO. 37-6620APART NO. 37-6620A
PART NO. 37-6620APART NO. 37-6620A
PART NO. 37-6620A
0451
Installation Instructions for
White-Rodgers is a division
of Emerson Electric Co.
www.white-rodgers.com
To prevent electrical shock and/or equipment dam-To prevent electrical shock and/or equipment dam-
To prevent electrical shock and/or equipment dam-To prevent electrical shock and/or equipment dam-
To prevent electrical shock and/or equipment dam-
age, disconnect electric power to system at main fuseage, disconnect electric power to system at main fuse
age, disconnect electric power to system at main fuseage, disconnect electric power to system at main fuse
age, disconnect electric power to system at main fuse
or circuit breaker box until installation is complete.or circuit breaker box until installation is complete.
or circuit breaker box until installation is complete.or circuit breaker box until installation is complete.
or circuit breaker box until installation is complete.
CAUTION
!
YOUR THERMOSTAT REPLACESYOUR THERMOSTAT REPLACES
YOUR THERMOSTAT REPLACESYOUR THERMOSTAT REPLACES
YOUR THERMOSTAT REPLACES
Typical System Compatibility ChartTypical System Compatibility Chart
Typical System Compatibility ChartTypical System Compatibility Chart
Typical System Compatibility Chart
1E781E78
1E781E78
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) No
Heat/Cool Systems Electric Heat (24 volt) No
Heat Only Electric Heat Systems (24 volt) No
Cool Only Systems No
Heat Pump Systems (No Aux. or Emergency Heat) No
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 Exceeding 30VAC, 1.5 Amp No
1
PREPARATIONSPREPARATIONS
PREPARATIONSPREPARATIONS
PREPARATIONS
Assemble tools required as shown below.
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED
FLAT BLADE SCREWDRIVER
WIRE CUTTER/STRIPPER
2
THERMOSTAT DETAILSTHERMOSTAT DETAILS
THERMOSTAT DETAILSTHERMOSTAT DETAILS
THERMOSTAT DETAILS
3
REMOVING OLD THERMOSTATREMOVING OLD THERMOSTAT
REMOVING OLD THERMOSTATREMOVING OLD THERMOSTAT
REMOVING OLD THERMOSTAT
Before removing wires from old thermostat’s switching subbase,
label each wirelabel each wire
label each wirelabel each wire
label each wire with the terminal designation it was removed
from.
1.
Remove Old Thermostat:Remove Old Thermostat:
Remove Old Thermostat:Remove Old Thermostat:
Remove Old Thermostat: A standard heat/cool thermostat
consists of three basic parts:
a.The cover, which may be either a snap-on or hinge type.
b.The base, which is removed by loosening all captive
screws.
c. 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 wiresWith wires
With wiresWith wires
With wires
still attached,still attached,
still attached,still attached,
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 usingIdentify each wire attached to the old thermostat using
Identify each wire attached to the old thermostat usingIdentify each wire attached to the old thermostat using
Identify each wire attached to the old thermostat using
the labels enclosed with the new thermostat.the labels enclosed with the new thermostat.
the labels enclosed with the new thermostat.the labels enclosed with the new thermostat.
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.DO NOT LET WIRES FALL BACK INTO THE WALL.
DO NOT LET WIRES FALL BACK INTO THE WALL.DO NOT LET WIRES FALL BACK INTO THE WALL.
DO NOT LET WIRES FALL BACK INTO THE WALL.
6. Install new thermostat using the following procedures.
CONTENTSCONTENTS
CONTENTSCONTENTS
CONTENTS
Preparations ............................................... 1
Thermostat Details ..................................... 1
Removing Old Thermostat ......................... 1
Mounting and Wiring................................... 2
Check Thermostat Operation ..................... 3
Specifications .............................................. 4
Troubleshooting .......................................... 4
Failure to follow and read all instructions carefullyFailure to follow and read all instructions carefully
Failure to follow and read all instructions carefullyFailure to follow and read all instructions carefully
Failure to follow and read all instructions carefully
before installing or operating this control could causebefore installing or operating this control could cause
before installing or operating this control could causebefore installing or operating this control could cause
before installing or operating this control could cause
personal injury and/or property damage.personal injury and/or property damage.
personal injury and/or property damage.personal injury and/or property damage.
personal injury and/or property damage.

Questions and Answers

  • A
    Angela OrtizJul 31, 2025
    What to do if my White Rodgers Thermostat has no heat?
    • B
      Benjamin RichardsonJul 31, 2025
      If your White Rodgers thermostat isn't producing heat, here are a few common issues to check: * A blown fuse or tripped circuit breaker could be the cause. Replace the fuse or reset the breaker. * The furnace power switch might be off. Ensure the switch is turned to the ON position. * The furnace blower compartment door or panel may be loose or improperly installed. Replace the door panel correctly to engage the safety interlock or door switch.
  • R
    Richard RobinsonAug 12, 2025
    What to do if White Rodgers Thermostat heat runs constantly?
    • L
      Lauren MillerAug 12, 2025
      If the heat runs constantly on your White Rodgers Thermostat, it could be due to: * A possible short in the wiring. Check each wire connection to ensure they are not shorted or touching each other. * A possible short in the thermostat itself. Try resetting the thermostat. * A possible short in the heat system. Contact the manufacturer of your system or a service person for guidance on testing the heat system for correct operation.
  • E
    elizabethparkerAug 18, 2025
    What to do if White Rodgers Thermostat display is blank?
    • K
      Kyle MercerAug 18, 2025
      If your White Rodgers Thermostat has a blank display or the keypad is not responding: * It could be due to a voltage spike or static discharge. Replace the batteries and check the heat/cool system for proper operation. * A battery change may be required. If a voltage spike occurs, use the Reset Operation.
  • A
    Amber WestAug 25, 2025
    Why does my White Rodgers 1e+78 cycle too fast?
    • G
      glozanoAug 25, 2025
      The cycle rate of your White Rodgers Thermostat might be influenced by its location or the size of the heating system. If an acceptable cycle rate isn't achieved, contact a local service person for additional suggestions.
  • J
    Jennifer MorrowNov 4, 2025
    Why is my White Rodgers 1e+78 not heating?
    • C
      cynthiawilsonNov 5, 2025
      If your White Rodgers thermostat isn't heating, consider these potential causes: * The pilot light may not be lit. Try re-lighting the pilot. * The SYSTEM switch may not be set to HEAT. Ensure it's set to HEAT and raise the temperature above the current room temperature. * There might be a loose connection to the thermostat or system. Verify that all thermostat and system wires are securely attached. * A Furnace Lock-Out Condition could be present. If the heat works intermittently, it's recommended to contact the furnace manufacturer or a local service person for assistance. * The heating system may require service, or the thermostat may need replacement. If the thermostat doesn't click after being reset, contact your heating and cooling service person or the place of purchase f...

Summary

YOUR THERMOSTAT REPLACES

1 PREPARATIONS

2 THERMOSTAT DETAILS

3 REMOVING OLD THERMOSTAT

Remove Old Thermostat

Describes the three basic parts of a standard heat/cool thermostat for removal.

4 MOUNTING AND WIRING

Hydronic (Hot Water or Steam) Heating Systems

Instructions for setting the thermostat for hydronic systems.

Attach Thermostat Base to Wall

Steps to securely mount the thermostat base to the wall.

Battery Location

Details on where to find and how to replace the thermostat batteries.

5 CHECK THERMOSTAT OPERATION

Heating System

Procedure for testing heating system operation with the thermostat.

The Thermostat Buttons and Switches

Identifies and explains the function of thermostat buttons and switches.

The Display

Explains the thermostat display elements and their meanings.

Operating Features

Details on thermostat features like temperature setting and °F/°C conversion.

LOW BATTERY INDICATOR

Information on the low battery warning and its implications.

TEMPERATURE DISPLAY ADJUSTMENT

Guidance on adjusting the thermostat's displayed temperature.

DISPLAY BACKLIGHT

Instructions on how to enable or disable the display backlight.

6 SPECIFICATIONS

ELECTRICAL DATA

Details electrical ratings for the thermostat.

THERMAL DATA

Provides thermal specifications including temperature ranges.

7 TROUBLESHOOTING

Reset Operation

Procedure to reset the thermostat for erratic operation or display issues.

Batteries

Recommendation for battery replacement for optimal performance.

No Heat (common problems)

Troubleshooting steps for common no-heat issues.

No Heat

Further troubleshooting for no heat conditions and potential causes.

Heat, Runs Constantly

Diagnosing why the heating system runs continuously.

Furnace Cycles Too Fast or Too Slow

Addressing issues with rapid or infrequent heating system cycling.

Thermostat Setting and Thermometer Disagree

Troubleshooting when thermostat settings do not match room temperature.

Blank Display and;or Keypad Not Responding

Resolving issues with a blank display or unresponsive keypad.

White Rodgers 1e+78 Specifications

General IconGeneral
Voltage24 VAC
MountingWall Mount
ColorWhite
Stages1 Heat/1 Cool
CompatibilitySingle Stage Heating or Cooling
Mounting OrientationHorizontal

Related product manuals