1F59-11
Low Voltage Heat Pump Thermostat
INSTALLATION & OPERATION
INSTRUCTIONS
WHITE-RODGERS
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
This thermostat is designed to control a heat pump
system where automatic changeover is not required. The
thermostat is equipped with EMER HEAT and AUX
indicator lights. The EMER HEAT indicator light can be
wired to a malfunction switch in the system to provide a
malfunction indicator.
PRECAUTIONS
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.
If in doubt about whether your wiring is millivolt, line, or
low voltage, have it inspected by a qualified heating and
air conditioning contractor, electrician, or someone famil-
iar with basic electricity and wiring.
!
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 30 volts. Higher
voltagewilldamagecontrolandcouldcauseshock
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 USE this thermostat on heat pump sys-
tems that have a spark ignition gas or fossil fuel
second stage heat source.
SPECIFICATIONS
ELECTRICAL DATA
THERMAL DATA
Electrical Rating:
Temperature Range: 40°F to 90°F (4°C to 32°C)
18 to 30 VAC, 50/60 Hz
0.01 to 1.5 amps (load per terminal)
2.5 amps max. total load (all terminals combined)
Rated Differential: Stage 1 heat – 1.3°F (max.)
Stage 2 heat – 0.9°F (max.)
Cooling – 1.3°F (max.)
STAGING DATA
DIMENSIONS
Up to two heating stages
One cooling stage
3.5” H x 5.5” w x 1.25” D
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
PART NO. 37-5271C
Printed in U.S.A.
Replaces 37-5271B
9520
ST. LOUIS, MISSOURI 63123-5398
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WIRE THERMOSTAT TO SYSTEM
Insert stripped wires into terminal blocks,
then tighten terminal screws.
For best electrical connection, use solid 18 gauge wire. If
you must use stranded wire, tin the wires with solder to
insure a good electrical connection.
Aux. Light
Emer. Heat
Light
1. Strip wires back 1⁄4”.
W
R
G
O
Y
B
L
See
2. Usingneedle-nosepliers,insertwireintocorrecttermi-
nal block opening (see figs. 3 and 4).
System
Function
Table
Anticipation
Selection
Switches
3. Tighten terminal block connector screw.
4. Repeat steps 2 and 3 for each wire.
Pull wires through this opening
Setpoint switch
(without knob)
NOTE
Figure 3. Thermostat base with typical wiring
Some applications may require that the fan be disabled in
the Emergency Mode. Refer to System Function Table.
NOTE
CAUTION
!
This typical wiring diagram shows only the terminal iden-
tificationandwiringhookup.Alwaysrefertowiringinstruc-
tions provided by equipment manufacturer for system
hookup.
To prevent electrical shock and/or equipment
damage, disconnect electrical power to system,
at main fuse or circuit breaker, until installation is
complete.
All wiring should be installed in accordance with local and
national codes and ordinances.
Malfunction
Light†
Thermostat
Control
Circuit
THERMOSTAT
SYSTEM
B
O
Y
G
W
C
L
R
Auxiliary
Heat
Relay
Reversing
Valve*
Compressor
Contactor
Malfunction
Switch
Hot
Fan
Reversing
Valve**
120 VAC
24 VAC
Relay
Neutral
TRANSFORMER
* Reversing valve is energized when the System Switch is in the HEAT position
** Reversing valve is energized when the System Switch is in the COOL position
†
Emergency light shown wired to malfunction circuit
Figure 4. Typical wiring diagram
3. Carefully snap cover onto thermostat base. Refer to
theOPERATIONsectionforinstructionsonsettingthe
thermostat for desired operation.
ATTACH SETPOINT KNOB AND COVER
1. After thermostat base is mounted on wall, remove
cardboard insert from setpoint switch.
2. Carefullypresssetpointknobontosetpointswitch(see
fig. 5).
Setpoint
Knob
Setpoint
Switch
1
2
O
F
F
F
F
G
O
Y
B
EMER
1
2
O
F
F
AUX
5
0
G
O
Y
B
5 5
4 5 5 0
4 0
60
62
6465
66
5 5
4 5 5 0
4 0
60
50
9 0
62
60
8 8
8 6
8 4
8 3
8 2
6465
66
70
80
68
9 0
90
8 8
8 6
8
8 3
8 2
69
70
71
68
7
69
70
71
8 1
8 0
7 9
72
73
74
7 8
77
8 1
8 0
7 9
72
73
74
7 8
77
B
C
A
Figure 5. Attach setpoint knob and cover
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OPERATION
SWITCH POSITIONS
SYSTEM FUNCTION
Rev
Valve Valve
(O) (B)
Rev
Aux
FAN
SYSTEM
Fan
Emer Relay
Heat Compr. Emer
Relay Contact Light
Aux.
Light
COMPONENT OPERATION
Auto
On
Cool
Off
Heat
No heat - no cool - no fan - no lights
Heating Mode: stage 1 calling. Fan relay,
compressor contactor, and reversing valve (B)
energized by thermostat.
Heating Mode: both stages calling. Fan relay,
compressor contactor, reversing valve (B),
and auxiliary heat relay are energized.
Emergency Heat Mode: aux heat, fan relay
and reversing valve (B) are energized.
Compressor locked out.
,
*
Cooling Mode: Fan relay, compressor
contactor and reversing valve (O) energized.
Fan On: Energizes fan relay regardless
of system switch position.
Indicates switch position on thermostat subbase and system function in operation.
* In Emergency Heat Mode, fan may be disabled, if required, by cutting jumper W7 (see fig 3).
This thermostat is easy to operate. The above table
EMER
AUX
shows how the system will operate when the FAN and
SYSTEM switches are in different positions.
FAN
AUTO
ON
70
To set the switches, open the door on the left side of the
thermostat (see fig 6). Move the FAN and SYSTEM
switches up or down to select desired system operation.
To set the temperature, move the temperature selection
knob (on the right side of the thermostat) until the desired
temperature is shown in the window.
SYSTEM
50 60 70 80 90
COOL
OFF
HEAT
EMER
Figure 6. Thermostat with door open
Antic.=14*
Antic.=10* (Factory setting) Antic.=16*
ANTICIPATION ADJUSTMENT
Antic.=30*
1
2
1
2
1
2
1
2
The anticipation setting on this thermostat is adjustable.
Any anticipation setting (including the factory setting) will
workwithanysystemforwhichthisthermostatisintended
for use. However, the user may be more comfortable with
a particular setting. If the system is turning on and off too
often (short cycles) or not often enough (long cycles) for
the user’s comfort, follow these steps to adjust the antici-
pation.
OFF
OFF
OFF
OFF
Shorter
Cycles
Longer
Cycles
* These numbers represent different anticipation settings. See fig. 8 for
further information.
Figure 7. Anticipation selection switch settings
Second Stage & Emergency Heat
Anticipation Approx.
First Stage Heat & Cool
Anticipation Approx.
Reference Temperature
1. Turn off power to the thermostat.
Reference Temperature
Number
10
2. Remove the thermostat cover.
Number
10
Differential*
0.8°F
Differential*
0.3°F
3. Find the anticipation adjustment switches (see fig. 3).
14
16
1.1°F
1.3°F
14
16
0.4°F
0.5°F
4. Usingapencilorsmallscrewdriver, movetheswitches
to the desired setting (see figs. 7 and 8).
30
2.4°F
30
0.9°F
5. Carefully snap the cover onto the thermostat base.
6. Turn on power to the thermostat.
* These numbers are approximate and represent thermostat operation with a
typical system. Actual temperature differentials may vary.
Figure 8. Approximate temperature differential and cycle times
LOCKOUT BYPASS OPTION
COMPRESSOR SHORT TERM
CYCLE PROTECTION
FOR QUALIFIED SERVICE TECHNICIANS’ USE
ONLY.OPERATORSSHOULDNOTUSETHISFEA-
TURE DUE TO POSSIBILITY OF EQUIPMENT OR
PROPERTY DAMAGE, OR PERSONAL INJURY.
This thermostat has a built-in short term (5-minute)
timedelay.Duringthis5-minuteperiod,thethermostat
will lock out the compressor to allow head pressure to
stabilize. If you want to override this feature while
testingthermostatoperation,movetheSYSTEMswitch
to OFF. Wait about 6 to 8 seconds, then move the
SYSTEM switch back to the previous position.
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.
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