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PART NO. 37-5271C
Replaces 37-5271B
9520
Printed in U.S.A.
1F59-11
Low Voltage Heat Pump Thermostat
INSTALLATION & 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
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.
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
WHITE-RODGERS
PRECAUTIONS
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.
This control is a precision instrument, and should be
handled carefully. Rough handling or distorting compo-
nents could cause the control to malfunction.
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 use on circuits exceeding 30 volts. Higher
voltage will damage control and could cause shock
or fire hazard.
DO NOT USE this thermostat on heat pump sys-
tems that have a spark ignition gas or fossil fuel
second stage heat source.
CAUTION
!
WARNING
!
SPECIFICATIONS
ELECTRICAL DATA
Electrical Rating:
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)
STAGING DATA
Up to two heating stages
One cooling stage
THERMAL DATA
Temperature Range: 40°F to 90°F (4°C to 32°C)
Rated Differential: Stage 1 heat – 1.3°F (max.)
Stage 2 heat – 0.9°F (max.)
Cooling – 1.3°F (max.)
DIMENSIONS
3.5” H x 5.5” w x 1.25” D