1F89-11
Non-Programmable Electronic Digital
Heat Pump Thermostat
WHITE-RODGERS
INSTALLATION AND
OPERATION INSTRUCTIONS
Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
Your new White-Rodgers Digital Heat Pump Thermostat
uses the technology of a solid-state microcomputer to
provide precise temperature control. This thermostat of-
fers you the flexibility to set heating and cooling tempera-
tures that fit your needs.
• °F/°C convertibility
• Temperature range 45° to 90°F
• Eight terminals for single or two-transformer systems
• O/B terminal for heat pump systems
• Armchair Demonstration Capability
Features:
• Simultaneous heat and cool temperature storage
• LCD continuously displays set point and room tem-
perature
PRECAUTIONS
This thermostat is intended for use with a 24-volt system;
do not use this thermostat with a millivolt or line voltage
system. If in doubt about whether your wiring is millivolt,
line, or low voltage, have it inspected by a qualified
heating and air conditioning contractor or electrician.
CAUTION
!
To prevent electrical shock and/or equipment
damage disconnect electric power to system at
main fuse or circuit breaker box until installation
is complete.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical
codes and ordinances.
WARNING
Do not use on circuits exceeding specified volt-
age. Higher voltage will damage control and
could cause shock or fire hazard.
!
This control is a precision instrument, and should be
handled carefully. Rough handling or distorting compo-
nents could cause the control to malfunction.
Do not short out terminals on gas valve or pri-
marycontroltotest. Shortorincorrectwiringwill
damage thermostat and could cause personal
injury and/or property damage.
SPECIFICATIONS
ELECTRICAL DATA
Electrical Rating:
Operating Humidity Range:
0 to 90% RH (non-condensing)
Shipping Temperature Range:
-40°F to 150°F
20 to 30 VAC 50/60 Hz. or D.C.
0.05 to 1.5 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals
combined)
APPLICATIONS
For use with:
THERMAL DATA
• Heat pump systems with up to two stages heat,
one stage cool
Setpoint Temperature Range:
45°F to 90°F (7°C to 32°C)
Operating Ambient Temperature Range:
32°F to 105°F
DO NOT USE WITH:
• Millivolt systems
• Systems exceeding 30 VAC and 1.5 amps
• 3-wire zoned hydronic heating systems
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
PART NO. 37-5741A
Printed in U.S.A.
Replaces 37-5612B
9636
ST. LOUIS, MISSOURI 63123-5398
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NOTE
the original manufacturer's instructions.
The following wiring diagrams show typical terminal
identification and wiring. For proper installation, refer to
Relay contacts shown are thermostatically operated.
FAN ON
MALF
Thermostat
Control
FAN
AUTO
Heat
FAN
AUTO
Emer
Circuit
EMERGENCY
or Cool
THERMOSTAT
SYSTEM
L
O/B
Y
G
W2
E
C
R
SYSTEM
MONITOR
SWITCH
Changeover
Relay*
Fan
Relay
Emergency
Relay
Aux/Emer
Relay
(Stage 2)
Compressor
Contactor
Hot
24 VAC
120 VAC
Neutral
* 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
TRANSFORMER
Figure 3. Typical wiring diagram for single transformer systems
NOTE
FAN ON
MALF
If safety circuits are in
only one of the systems,
remove the transformer
of the system with NO
safety circuits.
Thermostat
Control
Circuit
FAN
AUTO
Heat
FAN
AUTO
Emer
EMERGENCY
E
or Cool
THERMOSTAT
SYSTEM
L
O/B
Y
G
W2
C
R
CUT AND
TAPE OFF!
SYSTEM
MONITOR
SWITCH
Changeover
Relay*
Fan
Relay
Emergency
Relay
Limit or
Safety
Switches
HOT
120 VAC
24 VAC
Aux/Emer
Relay
(Stage 2)
Compressor
Contactor
Hot
NEUTRAL
24 VAC
120 VAC
Neutral
TWO COMMONS MUST
BE JUMPERED TOGETHER!
TRANSFORMER
* 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
Figure 4. Typical wiring diagram for two transformer systems with NO safety circuits
NOTE
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.
FAN ON
MALF
Thermostat
Control
Circuit
FAN
AUTO
Heat
FAN
AUTO
Emer
EMERGENCY
E
or Cool
THERMOSTAT
L
O/B
Y
G
W2
C
R
SYSTEM
Limit or
Safety
Limit or
Safety
Switches
HOT
Switches
24 VAC
120 VAC
SYSTEM
MONITOR
SWITCH
Changeover
Relay*
Fan
Relay
NEUTRAL
Emergency
Relay
24 VAC
Auxiliary
Heating
Transformer
NOTE
ACCESSORY
RELAY N.O.
CONTACT
Aux/Emer
Relay
(Stage 2)
The accessory relay scheme
is required when safety
circuits exist in both systems.
Compressor
Contactor
COMMON
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Limit or
Limit or
Safety
Switches
Safety
HOT
Switches
* 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
24 VAC
120 VAC
COMMON
NEUTRAL
Heat Pump Transformer
Figure 5. Typical wiring diagram for two transformer systems with safety circuits in BOTH systems
3
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Cooling System
ADJUSTABLE ANTICIPATION
The first stage has anticipation that can be set to 2.5 or
4cyclesperhourforheatingorcooling. Thesecondstage
heat has a fixed anticipation. To change the first stage
anticipationintheHEATmode, placetheSYSTEMswitch
CAUTION
To prevent compressor and/or property dam-
age, if the outdoor temperature is below 50°F,
DO NOT operate the cooling system.
!
intheOFFposition.Whileholdingthe
button,movethe
SYSTEM switch to HEAT. The display will show S for 1. Move SYSTEM switch to COOL position.
slow (factory setting) or F for fast. Release the
button
2. Press
to adjust thermostat setting below room
when the desired anticipation setting is displayed.
temperature. The blower should come on immediately
on high speed, followed by cold air circulation. How-
ever, if the fan is running but the compressor is not
running and the word COOL is flashing, the compres-
sor lockout feature is operating (see Lockout Bypass
Optiontotemporarilyoverridethecompressorlockout
feature during testing).
CHECK THERMOSTAT OPERATION
If at any time during testing your system does not operate
properly, contact a qualified serviceperson.
Fan Operation
3. Press
to adjust temperature setting above room
1. Turn on power to the system.
temperature. The cooling system should stop oper-
ating.
2. Move SYSTEM switch to OFF position.
3. Move FAN switch to ON. The blower should begin to
operate.
4. MoveFANswitchtoAUTOposition.Theblowershould
stop within a short period of time.
Heating System
1. Move SYSTEM switch to HEAT position. If the auxil-
iary heating system has a standing pilot, be sure to
light it.
2. Press
to adjust thermostat setting to 90° and hold
for five seconds. Both stages of the heating system
should begin to operate. However, if the word HEAT is
flashing, the compressor lockout feature is operating
(see Lockout Bypass Option to temporarily override
the compressor lockout feature during testing).
3. Press
to adjust temperature setting below room
LOCKOUT BYPASS OPTION
temperature. The auxiliary heating system will stop
immediately, and the first stage will stop within three
to four minutes.
FOR QUALIFIED SERVICE TECHNICIANS’ USE
ONLY.OPERATORSSHOULDNOTUSETHISFEA-
TURE DUE TO POSSIBILITY OF EQUIPMENT OR
PROPERTY DAMAGE, OR PERSONAL INJURY.
COMPRESSOR SHORT TERM
CYCLE PROTECTION
This thermostat has a built-in short term (5-minute)
time delay. During this 5-minute period, the thermo-
stat will lock out the compressor to allow head pres-
sure to stabilize. If you want to override this feature
while testing thermostat operation, move the SYS-
TEM switch to OFF position for 6 to 10 seconds then
back to the desired mode.
DO NOT USE THE LOCKOUT BYPASS OPTION
UNLESSTHECOMPRESSOROILHEATERSHAVE
BEEN OPERATIONAL FOR 6 HOURS AND THE
SYSTEM HAS NOT BEEN OPERATIONAL FOR AT
LEAST 5 MINUTES.
4
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OPERATION
Before you begin operating your thermostat, you should
be familiar with its features and with the display and the
location and operation of the thermostat buttons. Your
thermostat consists of two parts: the thermostat cover
and the base. To remove the cover, gently pull it straight
out from the base. To replace the cover, line up the cover
with the base and press gently until the cover snaps onto
the base.
EMER
MALF
AUX
1
2
WHITE-RODGERS
OFF HEAT
FAN ON
AUTO
COOL
EMER
THE THERMOSTAT BASE
Other than the
and
buttons, the following are
located behind the door on the bottom of the thermostat
cover (see fig. 6). Pull the door down to open it.
3
4
The Thermostat Buttons and Switches
6
5
(Red arrow) Raises temperature setting.
(Blue arrow) Lowers temperature setting.
FAN switch (ON, AUTO).
1
2
3
4
HEAT
OFF
COOL
EMERGENCY
7
8
SYSTEM switch (COOL, OFF, HEAT, EMER).
Figure 6. Thermostat display, buttons, and switches
The Display
HEAT is displayed when the SYSTEM switch is in the
1. Place the SYSTEM switch in the OFF position.
5
HEAT position. COOL is displayed when the SYS-
TEM switch is in the COOL position. COOL or HEAT
is displayed (flashing) when the compressor is in
lockout mode. OFF is displayed when the SYSTEM
switch is in the OFF position.
2. While holding the
button, move the SYSTEM
switch to HEAT or COOL. Release the
button
when the display shows only the current tem-
perature.
3. Press
or
toadjustthedisplayedtemperature
Displays current room temperature.
6
7
to your desired setting.
4. Thethermostatwillresumenormaloperationwithin
two minutes.
EMERGENCY is displayed when the system switch
is in the EMER position.
Displays current set temperature.
8
• RESET BUTTON - (see fig. 2) resets the thermostat
to the factory setting. This button can be used to reset
the thermostat if it has been subjected to a voltage
spike and has become scrambled or frozen.
OPERATING FEATURES
Now that you are familiar with the thermostat buttons and
display, read the following information to learn about the
many features of the thermostat.
SETTING YOUR THERMOSTAT
This thermostat is easy to operate. Set the SYSTEM
• TEMPERATURESETPOINT—Press
the display shows the temperature you want.
• °F/°C CONVERTIBILITY — Press and
or
until
switch to HEAT, COOL or EMERgency. Press
or
untilthetemperaturetomaintainisshownontherightside
of the display. To turn the system off, move the SYSTEM
switch to OFF.
but-
tons until the temperature display is in Celsius (°C).
To display Fahrenheit (°F), repeat the process.
TheFANswitchcontrolsthefanoperation.WhentheFAN
switch is set to AUTO, the fan will cycle with the Heat
Pump. When the FAN switch is set to ON, the fan will run
continuously, regardless of SYSTEM switch position.
• TEMPERATURE DISPLAY ADJUSTMENT — Your
new thermostat has been accurately set in our fac-
tory. However, if you wish, you may adjust your new
thermostat temperature display to match your old
thermostat. This can be accomplished (within a ±4°
range) as follows:
5
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