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Emerson 1F73 User Manual

Emerson Radio

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Installation Instructions for

Heating & Air Conditioning

1F73

Non- Programmable, Auto Changeover

Multi-stage/Heat Pump Thermostat

CONTENTS

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

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

Removing Old Thermostat ......................... 1-2

Mounting and Wiring .................................. 2-4

Check Thermostat Operation ..................... 5-6

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

Operation ...................................................... 6

Troubleshooting ......................................... 7-8

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.

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. 37-6489B

Replaces 37-6489A

0621

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

1

2

3

WIRE CUTTER/STRIPPER

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

Description

1F73

Heat Pump (No Aux or Emergency Heat)

Yes*

Heat Pump (with Aux or Emergency Heat)

Yes*

Standard Heat & Cooling Systems

Yes*

Two Stage Heat & Two Stage Cool

Yes*

Standard Heat Only Systems

Yes*

Millivolt Heat Only Systems – Floor or Wall Furnaces

No

Standard Central Air Conditioning

Yes*

Gas or Oil Heat

Yes*

Electric Furnace

Yes*

Hydronic (Hot Water) Zone Heat – 2 Wires

Yes*

Hydronic (Hot Water) Zone Heat – 3 Wires

No

* Requires common for 24 VAC at the thermostat

(O/B)Y2

E/W1

R

C

Y1

W2

G

GAS

ELEC

B

O

L

Figure 1. Thermostat Base

Elec – Gas

Switch

Mounting

Hole

Mounting

Hole

O/B Terminal

Switches Selection

White-Rodgers is a division

of Emerson Electric Co.

www.white-rodgers.com