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White Rodgers 1F78-151 Non Programmable Thermostat Instructions

12

CONTENTS

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

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

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

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

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

Speciﬁcations ................................................ 5

Troubleshooting ............................................. 5

Installation Instructions for

Heating & Air Conditioning

1F78

Non-Programmable Thermostat

YOUR THERMOSTAT REPLACES

Typical System Compatibility Chart

PREPARATIONS

Assemble tools required below.

1F78

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)

Ye s

FLAT BLADE SCREWDRIVER

Heat/Cool Systems Electric Heat (24 volt)

Heat Only Electric Heat Systems (24 volt)

Cool Only Systems (24 volt)

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

WIRE CUTTER/STRIPPER

Failure to follow and read all instructions carefully

before installing or operating this control could cause

personal injury and/or property damage

Ye s

12 VDC Mobile Home Application

Multistage Systems

Systems Exceding 30VAC, 1.5 Amp

REMOVING OLD THERMOSTAT

THERMOSTAT DETAILS

Mounting

hole

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.

W904

Clip for

Celsius

Display

1. Remove Old Thermostat: A standard heat/cool thermostat

consists of three basic parts:

W904

a. The cover, which may be either a snap-on or hinge type.

b. The base, which is removed by loosening all captive screws.

W905

c. The switching subbase, which is removed by unscrewing

the mounting screws that hold it on the wall or adaptor plate.

ELEC GAS

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

complete. Ensure that electrical power is disconnected.

Mounting

hole

W905 Clip

for Hydronic

System

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.

Electric/Gas

Switch

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. 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.

PART NO. 37-6615C

Replaces 37-6615B

1028

www.white-rodgers.com

www.emersonclimate.com

https://manual-hub.com/

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General	Details
Name	White Rodgers 1F78-151 Non Programmable Thermostat Instructions
Make	WHITE RODGERS
Language	English
Filetype	PDF (Download)
File size	0.42 MB

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Get the free PDF manual for the White Rodgers 1F78-151 Non Programmable Thermostat Instructions and access setup steps, usage instructions, and troubleshooting tips. 👉 View online or download now to keep your thermostat running smoothly!

White-Rodgers 1F78-151 Manual: Questions and Answers

What does a blank display mean on my White-Rodgers 1F78-151?

A voltage spike or static discharge blanked the display, or batteries need replacement. Replace batteries first and check your heating/cooling system. Instructions, p. 6

How do I fix no heat on White-Rodgers 1F78-151?

Set the SYSTEM switch to HEAT and raise the setpoint above room temperature. Listen for a soft click within a few seconds, which indicates proper operation.

Set the SYSTEM switch to HEAT.
Raise the setpoint temperature above the current room temperature.
Listen for a soft click sound from the thermostat within a few seconds.
If no click occurs, try the reset operation. If it still won't click after reset, contact service. Instructions, p. 5

What does it mean if White-Rodgers 1F78-151 cycles too fast?

Symptom	What It Means
Heat cycles too fast or too slow	Digital thermostats cycle faster than older mechanical models but run shorter with no added energy use. Clipping Jumper W-905 can increase cycle time for hydronic heating only.
Cool cycles too fast or too slow	The cycle rate for cooling is fixed and cannot be adjusted. Contact a local service person for suggestions.

Instructions, p. 6