White Rodgers 1 F 78 - User Manual

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Installation Instructions for

Heating & Air Conditioning

1F78

7 Day Programmable Thermostat

CONTENTS

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

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

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

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

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

Programming your Thermostat ..................... 4

Specifications ................................................ 6

Troubleshooting ............................................ 6

PREPARATIONS

THERMOSTAT DETAILS

REMOVING OLD THERMOSTAT

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:

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 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.

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.

CAUTION

PART NO. 37-6522A

0404

WHITE-RODGERS

EMERSON ELECTRIC CO.

9797 REAVIS ROAD

ST. LOUIS, MISSOURI 63123-5398

www.white-rodgers.com

Failure to follow and read all instructions carefully

before installing or operating this control could cause

personal injury and/or property damage

Assemble tools required as shown below.

YOUR THERMOSTAT REPLACES

WIRE CUTTER/STRIPPER

Typical System Compatibility Chart 620

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

B RC

GAS

ELEC

W904

W905

Figure 1. Thermostat base

Mounting

hole

Mounting

hole

W905

Clip for

Hydronic

System

W904

Clip for

Celsius Display

Electric/Gas

Switch

HAND OR POWER

DRILL WITH 3/16 INCH

DRILL BIT, IF NEEDED

FLAT BLADE SCREWDRIVER

SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—

THERMOSTAT DOES NOT NEED TO BE LEVEL TO WORK PROPERLY

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Questions and Answers

C
Claire MclaughlinJul 27, 2025
What to do if my White Rodgers 1 F 78 has no heat, no cool, and no fan?
- M
  Mark HolmesJul 27, 2025
  If your White Rodgers Thermostat isn't producing heat, cool air, or fan function, start by checking the fuse or circuit breaker and replace the fuse or reset the breaker if necessary. Also, make sure the furnace power switch is in the ON position. Finally, ensure the furnace blower compartment door or panel is correctly installed to engage the safety interlock or door switch.
M
michael41Aug 9, 2025
Why is my White Rodgers 1 F 78 Thermostat not producing heat?
- R
  Richard KimAug 9, 2025
  If your White Rodgers Thermostat isn't producing heat, there are a few potential causes. First, check if the pilot light is lit and relight it if necessary. Ensure the system switch is set to 'Heat' and the temperature is set above the current room temperature. Also, verify that all thermostat and system wires are securely attached. If the heat works intermittently, it may be a furnace lock-out condition, and you should contact the furnace manufacturer or a local service person for assistance.