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

4

CONTENTS

Preparations ................................................ 1

Thermostat Details ...................................... 1

Removing Old Thermostat........................... 1

Mounting and Wiring.................................... 2

Check Thermostat Operation....................... 3

Speciﬁcations .............................................. 4

Troubleshooting ........................................... 4

Installation Instructions for

Heating & Air Conditioning

1E78

Non-Programmable Heat Only Thermostat

YOUR THERMOSTAT REPLACES

Typical System Compatibility Chart

PREPARATIONS

Assemble tools required as shown below.

1E78

Standard Heat Only Two Wire Gas or Oil Fired Systems (24 volt)

Electronic Ignition Heat Only Two Wire Systems (24 volt)

Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt)

Standard Heat/Cool Systems (24 volt)

Yes

FLAT BLADE SCREWDRIVER

Heat/Cool Systems Electric Heat (24 volt)

Heat Only Electric Heat Systems (24 volt)

Cool Only Systems

HAND OR POWER

DRILL WITH 3/16 INCH

DRILL BIT, IF NEEDED

Heat Pump Systems (No Aux. or Emergency Heat)

Hot Water Zone Heat Only (Two Wire) Systems

Hot Water Zone Heat Only (Three Wire) Systems

Line Voltage Heating or Baseboard 110/240 Volt Systems

Millivolt Systems Floor or Wall Furnaces

12 VDC Mobile Home Application

WIRE CUTTER/STRIPPER

Failure to follow and read all instructions carefully

beforeinstallingoroperatingthiscontrolcouldcause

personal injury and/or property damage.

Multistage Systems

Systems Exceeding 30VAC, 1.5 Amp

THERMOSTAT DETAILS

REMOVING OLD THERMOSTAT

CAUTION

Topreventelectricalshockand/orequipmentdamage,

disconnect electric power to system at main fuse or

circuit breaker box until installation is complete.

Mounting

Hole

Before removing wires from old thermostat’s switching subbase,

label each wire with the terminal designation it was removed

from.

W904

W905

1. Remove OldThermostat: 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.

Back of

Thermostat Body

Mounting

Hole

2. Shut off electricity at the main fuse box until installation is

complete. Ensure that electrical power is disconnected.

Base

3. Remove the front cover of the old thermostat. With wires

still attached, remove wall plate from the wall. If the old

thermostathasawallmountingplate,removethethermostat

and the wall mounting plate as an assembly.

W904 - clip for Celcius display

W905 - clip for hydronic system

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

4. Identify each wire attached to the old thermostat using

the labels enclosed with the new thermostat.

Figure 1.Thermostat

5. Disconnectthewiresfromtheoldthermostatoneatatime.

DO NOT LET WIRES FALL BACK INTO THE WALL.

6. Install new thermostat using the following procedures.

PART NO. 37-6620B

Replaces 37-6620A

1026

www.white-rodgers.com

www.emersonclimate.com

https://manual-hub.com/

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General	Details
Name	White-Rodgers 1E78 Non Programmable Heat Only Thermostat User Manual
Make	WHITE RODGERS
Language	English
Filetype	PDF (Download)
File size	0.27 MB

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White-Rodgers 1E78 Only Manual: Questions and Answers

Can White-Rodgers 1E78 Only work with heat pump systems or cool only systems?

No. This thermostat is designed for heat only systems. It does not support heat pump systems, cool only systems, or any heat/cool combination. User Manual, p. 1

What does the battery symbol mean on White-Rodgers 1E78 Only display?

The battery icon indicates the alkaline batteries are low and need replacement with fresh AAA Energizer batteries. User Manual, p. 2

How do I attach the thermostat base to the wall?

Position the base over the wall hole, mark mounting locations, drill holes, and fasten loosely with two screws. Adjust until level, then tighten.

Remove packing material and pull thermostat body straight off the base.
Connect wires beneath terminal screws on base using the appropriate wiring schematic.
Place base over hole in wall and mark mounting hole locations using base as a template.
Move base out of the way and drill the marked holes.
Fasten base loosely to wall with two mounting screws.
Adjust base until level, then tighten screws completely. For oversized holes, use plastic screw anchors. User Manual, p. 2