White-rodgers IF72 User Manual

Installation Instructions for

1

2

3

CAUTION

!

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

Mounting

Description

Heat Pump (No Aux or Emergency Heat) Yes

Heat Pump (with Aux or Emergency Heat) Yes

Standard Heat & Cooling Systems No

Standard Heat Only Systems No

Millivolt Heat Only Systems – Floor or Wall Furnaces No

Standard Central Air Conditioning No

Gas or Oil Heat No

Electric Furnace No

Hydronic (Hot Water) Zone Heat – 2 Wires No

Hydronic (Hot Water) Zone Heat – 3 Wires No

Heating & Air Conditioning

1F72

5/2 Day Programmable
Heat Pump Thermostat

CONTENTS

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

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

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

Mounting and Wiring ................................... 2-3

Check Thermostat Operation ...................... 4-5

Programming your Thermostat ................... 6-7

Specifications ................................................ 7

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

YOUR THERMOSTAT REPLACES

THERMOSTAT DETAILS

W904

Clip for Celsius

(current location)

W905

Clip for Slow Cycle

(current location)

Mounting

hole

(location on

earlier models)

W903

W903

W904 & W905

(location on earlier

models)

Figure 1. Thermostat base

W903

W903

Clip to Disable

EMR Feature

(current location)

E

R

W2

O/B

L

CY

G

W906 for Emergency

Heat Second Stage

PREPARATIONS

Assemble tools required as shown below.

Failure to follow and read all instructions carefully
before installing or operating this control could cause
personal injury and/or property damage.

REMOVING OLD THERMOSTAT

hole

O/B

Terminal
Switches
Selection

Fan Control

www.white-rodgers.com

www.emersonclimate.com

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.

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.

O/B

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.

PART NO. 37-6498B

Replaces 37-6498A

1122

4

CAUTION

!

3

REMOVING OLD THERMOSTAT

WARNING

!

CONTINUED FROM FIRST PAGE

ATTENTION! This product does not contain mercury. However,

this product may replace a unit which contains mercury.
Do not open mercury cells. If a cell becomes damaged, do not

touch any spilled mercury. Wearing non-absorbent gloves, take
up the spilled mercury and place into a container which can be
sealed. If a cell becomes damaged, the unit should be discarded.

Mercury must not be discarded in household trash. When the unit
this product is replacing is to be discarded, place in a suitable
shipping container. Refer to www.white-rodgers.com for location
to send the product with mercury.

O/B Terminal Switch Selection

The O/B switch on this thermostat is factory set to “O” position.
This will accommodate the majority of heat pump applications,
which require the changeover relay to be energized in COOL. If the
thermostat you are replacing or the heat pump being installed with
this thermostat requires a “B” terminal, to energize the changeover
relay in HEAT, the O/B switch must be moved to the “B” position.

Take care when securing and routing wires so they do
not short to adjacent terminals or rear of thermostat.
Personal injury and/or property damage may occur.

MOUNTING AND WIRING

Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could cause
shock or fire hazard.

Do not short out terminals on gas valve or primary control
to test. Short or incorrect wiring will damage thermostat
and could cause personal injury and/or property damage.

Thermostat installation and all components of the sys­tem shall conform to Class II circuits per the NEC code.

Electric/Gas Jumper (Fan Option)

If your emergency or auxiliary system will energize the blow­er, then jumper W906 on the thermostat base must be cut
(see fig. 1).

If your emergency or auxiliary heat system requires that the ther­mostat energize the fan circuit, do not cut jumper W906.

If you are unsure of your application, contact a qualified
serviceperson.

°F or °C Selection

The factory default setting for temperature display is Fahrenheit.
If you want the temperature in Celsius, clip jumper W904.

Fast or Slow Cycle Selection

The factory default setting is fast cycle, which cycles 1st stage
at approximately 1.2°F and 2nd stage 0.75°F. If you prefer slow
cycle, clip jump W905. The 1st stage and 2nd stage would be

1.5°F and 1.2°F respectively.

Attach Thermostat Base to Wall

1. Remove the packing material from the thermostat. Gently
pull the cover straight off the base. Forcing or prying on the
thermostat will cause damage to the unit.

2. Connect wires beneath terminal screws on base using ap­propriate wiring schematic (see figs. 2 through 4).

3. Place base over hole in wall and mark mounting hole locations
on wall using base as a template.

4. Move base out of the way. Drill mounting holes.

5. Fasten base loosely to wall, as shown in fig. 1, using two
mounting screws. Place a level against bottom of base, adjust
until level, and then tighten screws. (Leveling is for appear­ance only and will not affect thermostat operation.) If you are
using existing mounting holes, or if holes drilled are too large
and do not allow you to tighten base snugly, use plastic screw
anchors to secure subbase.

6. Push excess wire into wall and plug hole with a fire-resistant
material (such as fiberglass insulation) to prevent drafts from
affecting thermostat operation.

Battery Location

This thermostat does not require batteries to operate. The 2
“AAA” alkaline batteries are for the thermostat to remember the
programming if AC voltage is lost. If the display shows BATT or

when AC power is not present, the batteries are
low and should be replaced with fresh “AAA” alkaline batteries.
For best results, replace all batteries with new premium brand
alkaline batteries such as Duracell® or Energizer®. To replace the
batteries, install the batteries along the top of the base (see fig.

1). The batteries must be installed with the positive (+) ends to
the right.

Energy Management Recovery (EMR)

This thermostat is set to operate with EMR. This causes the
thermostat to start the heating or cooling system early to have
the room temperature reach the program setpoint at the time the
period is to start.

To disable EMR, clip jumper W903 (see Fig. 1).

2

MOUNTING AND WIRING

4

L

R

E

24 VAC

120 VAC

Hot

SYSTEM

MONITOR

SWITCH

Neutral

THERMOSTAT

SYSTEM

G W2

Figure 2. Typical wiring diagram for single transformer systems

TRANSFORMER

(Class II)

Changeover

Relay*

CYO/B

Compressor

Contactor

* Changeover Relay is energized in COOL when O/B switch is in the “O” position

Changeover Relay is energized in HEAT when O/B switch is in the “B” position

Aux

Relay

(Stage 2)

Fan

Relay

Emergency

Relay

See Note **

** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency

L

R

E

SYSTEM

MONITOR

SWITCH

G W2

Figure 4. Typical wiring diagram for two transformer systems with safety circuits in BOTH systems

Changeover

Relay*

CYO/B

Compressor

Contactor

* Changeover Relay is energized in COOL when O/B switch is in the “O” position

Changeover Relay is energized in HEAT when O/B switch is in the “B” position

Aux

Relay

(Stage 2)

Fan

Relay

Emergency

Relay

TWO COMMONS MUST
BE JUMPERED TOGETHER!

24 VAC 120 VAC

HOT

NEUTRAL

THERMOSTAT

SYSTEM

HOT

NEUTRAL

120 VAC

Limit or

Safety

Switches

Limit or

Safety

Switches

Limit or

Safety

Switches

24 VAC

Limit or

Safety

Switches

COMMON

COMMON

Auxiliary

Heating

Transformer

(Class II)

Heat Pump Transformer

(Class II)

24 VAC

ACCESSORY

RELAY N.O.

CONTACT

Polarity must be observed. If the HOT side of the second transformer
is jumpered to the COMMON side of the first transformer a short will
be made. Damage to equipment will occur when power is restored.

NOTE

The accessory relay scheme
is required when safety
circuits exist in both systems.

NOTE

See Note **

** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency

L

R

E

24 VAC

120 VAC

Hot

SYSTEM

MONITOR

SWITCH

Neutral

THERMOSTAT

SYSTEM

G W2

Figure 3. Typical wiring diagram for two transformer systems with NO safety circuits

TRANSFORMER

(Class II)

Changeover

Relay*

CYO/B

Compressor

Contactor

* Changeover Relay is energized in COOL when O/B switch is in the “O” position

Changeover Relay is energized in HEAT when O/B switch is in the “B” position

Aux

Relay

(Stage 2)

Fan

Relay

Emergency

Relay

Limit or

Safety

Switches

TWO COMMONS MUST
BE JUMPERED TOGETHER!

HOT

NEUTRAL

120 VAC

24 VAC

CUT AND

TAPE OFF!

If safety circuits are in only one of the systems, remove
the transformer of the system with NO safety circuits.

NOTE

** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency

See Note **

CONTINUED FROM SECOND PAGE

3