1F58-72
LowVoltageMulti-StageHeatPumpThermostat
WHITE-RODGERS
INSTALLATION 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 and subbase combination is designed to
controlaheatpumpsystemwhereautomaticchangeover
is not required. The reversing valve may be energized
whentheSYSTEMswitchismovedtotheHEATorCOOL
position.
SYSTEM
HEAT
EMER.
FAN
OFF
COOL
ON
AUTO
CHECK
LIGHT
90
80
70
60
50
70
80
60
90
50
AUX
HEAT
The subbase is equipped with EMER HEAT, AUX HEAT,
and CHECK operation indicator lights.
EMER
HEAT
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.
Ifindoubtaboutwhetheryourwiringismillivolt,line,orlow
voltage, have it inspected by a qualified heating and air
conditioning contractor, electrician, or someone familiar
with basic electricity and wiring.
!
Do not exceed the specification ratings.
All wiring must conform to local and national electrical
codes and ordinances.
Donotshortoutterminalsongasvalveorprimary
control to test. Short or incorrect wiring will burn
out heat anticipator and could cause personal
injury and/or property damage.
This control is a precision instrument, and should be
handled carefully. Rough handling or distorting compo-
nents could cause the control to malfunction.
WARNING
!
Do not use on circuits exceeding 30 volts. Higher
voltage will damage control and could cause
shock or fire hazard.
SPECIFICATIONS
ELECTRICAL DATA
Circuit: Manual Changeover – Reversing valve may
be energized when the SYSTEM switch is
switched either the HEAT or COOL position
on the subbase (see wiring diagram).
Switch Rating:
24 VAC
Stage 1 heat – 0 to 1.2 amp
Stage 2 heat – 0.15 to 1.2 amp
Cooling – 0 to 1.5 amp
THERMAL DATA
Temperature Range: 50°F to 90°F (10°C to 32°C)
Rated Differential: Stage 1 heat – 1.5°F
Stage 2 heat – 1°F
Switch Action:
Stage 1 heat & cool – SPDT
Stage 2 heat – SPST (sealed mercury contacts)
Anticipator Rating:
Cooling – 1.5°F
DIMENSIONS (INCLUDING SUBBASE):
Stage 1 heat – 24 VAC, fixed
Stage 2 heat – 0.15 to 1.2 amp, adjustable
Cooling – 24 VAC, fixed
Height 31⁄4 ”, width 53⁄4”, depth 21⁄8
”
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
PART NO. 37-4046F
Replaces 37-4046E
9414
Printed in U.S.A.
CAUTION
NOTE
!
To prevent electrical shock and/or equipment
damage, disconnect electrical power to system,
at main fuse or circuit breaker, until installation is
complete.
This typical wiring diagram shows only the terminal iden-
tification and wiring hookup. Always refer to wiring
instructions provided by equipment manufacturer for sys-
tem hookup.
All wiring should be installed in accordance with local and
national codes and ordinances.
FAN CAUTION
!
Topreventpersonalinjuryand/orequipmentdam-
age, check equipment manufacturer’s wiring of
fan relay circuit when in EMER HEAT. When the
thermostat system switch is in the EMER HEAT
position, the thermostat DOES NOT energize the
fan relay when the fan switch is in the AUTO
position.
Adjustable Stage 2
Heat Anticipator
COOL
Fixed Stage 1 Heat
& Cool Anticipator
STAGE 2
HEAT
STAGE 1
HEAT
THERMOSTAT
SUBBASE
Fan
Switch
AUTO ON
System
Switch
The emergency light cycles with
emergency heat.
The auxiliary light cycles with stage
2 heat in either HEAT or EMER sys-
tem switch positions.
CHECK
Light
EMER
Light
If a malfunction switch is wired to
terminal L, the check light will indi-
cate
contacts close.
a
malfunction when switch
AUX Light
G
R
L
X1
E
B
W2
Y
O
HEAT PUMP
SYSTEM
Malfunction
Switch
EMER. HEAT
RELAY
AUXILIARY
HEAT RELAY
COMPRESSOR
CONTACTOR
FAN
RELAY
*
*
120 VAC
24 VAC
TRANSFORMER
Reversing Valve – if the reversing valve in your heat pump energizes
during HEAT, then make your electrical connection at terminal B on
the subbase. If the reversing valve is energized during COOL, then
make your connection at terminal O on the subbase.
*
Always refer to equipment manufacturer’s instructions for proper
identification of the reversing valve electrical connections.
Figure 2. Typical wiring diagram
3
3. Attach thermostat base to subbase. Be sure that all
captive screws are tightened snugly, because they
serve as electrical connections between thermostat
and subbase (see fig. 4).
ATTACH THERMOSTAT TO SUBBASE
1. Remove cover from thermostat base by gripping the
base in one hand and with the fingers of the other
hand, pull lightly at the top or bottom of the cover.
4. Snap cover onto thermostat and set temperature
lever to desired setpoint. Turn on electrical power.
2. Carefully remove the shipping protective packing
from the mercury switches.
Mounting
screws
CHECK
LIGHT
FAN
AUTO
ON
FAN
SYSTEM
SYSTEM
COOL
OFF
AUTO ON COOL OFF HEAT EMER.
HEAT
AUX
HEAT
CHECK
LIGHT
Captive terminal
screws
EMER
HEAT
G
Y
R
AUX
E
HEAT
B
W2
60
70
80
EMER
HEAT
50
Subbase
X1
L
O
90
90
Captive terminal
screws
80
70
60
50
Hole
in wall
KEEP THIS AREA
CLEAR OF WIRES!
Mounting screw
Mounting screw
Thermostat
Figure 3. Thermostat subbase
Cover
Figure 4. Attach thermostat to subbase
OPERATION &
MAINTENANCE
The chart below shows the how the system functions when
the system and fan switches are in various positions.
SUBBASE SWITCH POSITIONS
FAN SYSTEM
SYSTEM FUNCTION
Emer
Heat
Aux
Fan
Rev
Heat Compr. Emer
Aux
Light
COMPONENT OPERATION
Auto
On
Cool
Off
Heat
Emer Relay Valve Relay Relay Contact Light
No heat - no cool - no fan - no lights
Heat Mode: stage 1 calling. Fan relay and com-
pressor contactor energized by thermostat.
B
B
Heat Mode: both stages calling. Fan relay, com-
pressor contactor, and auxiliary heat relay are
energized. Aux. light on.
Emergency Heat Mode: stage 1 calling. Emergency
heat relays energized. Compressor locked out at
thermostat. Emer. light on.
G
G
B
B
O
Emergency Heat Mode: both stages calling. Emer-
gency and auxiliary heat relays energized. Compres-
sor locked out at thermostat. Emer. and aux. lights on.
Cool Mode: Compressor contactor and fan relay
energized.
Fan relay energized. Fan runs continuously,
regardless of system switch position.
When check light is wired to a malfunction switch in
the heat pump system, check light will come on when
the malfunction switch contacts close, regardless of
system switch position.
Indicates switch position on thermostat subbase
and system function at those switch positions.
Reversing valve energized if connected to the O terminal.
O
G
Reversing valve energized if connected to B terminal.
See fig. 2 (fan caution)
B
4
The stage 2 heat anticipator is located on the thermostat
base. Adjust the anticipator by turning the lever until the
pointer is set on the correct anticipator setting determined
above (see fig. 6). If additional adjustments are neces-
ADJUSTING STAGE 2 HEAT ANTICIPATOR
This thermostat is equipped with two anticipators. The
anticipator for stage 1 heat and cool is fixed and does not
requireanyadjustments.Thestage2anticipatorisadjust-
ableandmustbesettothecurrentdrawofthecomponent
it is controlling.
sary, they may be made as follows (adjust the anticipator
1
⁄
2
division at a time; for example, from 0.6 to 0.55).
1. Ifshorterheatingcyclesaredesired, settheanticipa-
tor to a slightly lower setting.
To determine the correct stage 2 anticipator setting,
measure the current draw of the stage 2 (auxiliary heat)
relay. You may use the following procedure to determine
current draw.
2. If longer heating cycles are desired, set the anticipa-
tor to a slightly higher setting.
1. Loosely wrap exactly 10 coils of thermostat wire
around the jaws of a split-jaw induction-type current
meter (see fig. 5).
2. With the subbase correctly wired to the heat pump
system, attach one end of the 10-turn coil to terminal
R and attach the other end to terminal W1.
Split jaw
current meter
10 turns
of wire
3. With the heat pump system power on, center the coil
on the meter jaws and read the current draw of the
stage2heatrelayonthemeteranddividethereading
by 10. This is the value that should be set on the
adjustable anticipator.
Figure 5. Current meter
.25
.3
.4
G
.2
Example:
.5
.18
Meter reads 6.0 amp
= 0.6ampanticipatorsetting
10 turns of wire
.6
.8
.15
1.0
4. Turn power to heat pump system off, then remove
coil leads from the subbase and move system switch
to OFF.
Move this lever to
adjust heat
Arrow points to the
matched current rating
of the primary control
anticipator
Figure 6. Anticipator adjustment
5. Move temperature adjustment lever to correspond to
actual room temperature. Then remove thermostat
cover.
CALIBRATION ADJUSTMENT
This thermostat has been carefully adjusted at the factory
and should not require recalibration.
7
6. Slip ⁄32” wrench onto hex nut, holding temperature
adjustmentleverstationary,andturnhexnutcounter-
clockwise until mercury just barely shifts to left end of
tube. Then replace cover and set thermostat to de-
sired temperature.
A few degrees difference between the indicator setting of
thethermostatandactualroomtemperatureisnotconsid-
ered important. If the disagreement is appreciable, how-
ever, first make sure that the thermostat is properly
located and leveled. Then, if recalibration still seems
necessary, proceed as follows:
1. Movetemperatureadjustmentlevertoasettingabout
5° above room temperature.
2. Remove thermostat cover. Slip 7⁄32” wrench onto hex
nut beneath bimetal and hold temperature adjust-
ment lever stationary. Turn hex nut clockwise until
mercury shifts to right end of tube (see fig. 7).
Temperature
Adjustment
Lever
Bimetal
3. Move temperature adjustment lever to lowest setting.
7/32" Calibration
Wrench
4. Replace thermostat cover. Wait 10 minutes for bi-
metal temperature to stabilize. Don’t stand near ther-
mostat during this period as your breath and body
heat will affect temperature of bimetal.
Figure 7. Calibrating thermostat
5
If you need further information about this product, please write to
WHITE-RODGERS DIVISION
Emerson Electric Co.
9797 Reavis Road
St. Louis, MO 63123-5398
Attn: Technical Service Department
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