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1F85-2751F85-275
1F85-2751F85-275
1F85-275
Heating & Air Conditioning
5-1-1 Programmable/Non-programmable, Auto
Changeover, Multi-Stage/Heat Pump Thermostat
PART NO. 37-6488CPART NO. 37-6488C
PART NO. 37-6488CPART NO. 37-6488C
PART NO. 37-6488C
Replaces 37-6488B
0838
INSTALLATION INSTRUCTIONSINSTALLATION INSTRUCTIONS
INSTALLATION INSTRUCTIONSINSTALLATION INSTRUCTIONS
INSTALLATION INSTRUCTIONS
OperOper
OperOper
Oper
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aa
a
tortor
tortor
tor
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::
:
Sa Sa
Sa Sa
Sa
vv
vv
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e these instre these instr
e these instre these instr
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uctions fuctions f
uctions fuctions f
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or futuror futur
or futuror futur
or futur
e use!e use!
e use!e use!
e use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BE-FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BE-
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BE-FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BE-
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BE-
FORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PER-FORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PER-
FORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PER-FORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PER-
FORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PER-
SONAL INJURY AND/OR PROPERTY DAMAGE.SONAL INJURY AND/OR PROPERTY DAMAGE.
SONAL INJURY AND/OR PROPERTY DAMAGE.SONAL INJURY AND/OR PROPERTY DAMAGE.
SONAL INJURY AND/OR PROPERTY DAMAGE.
PREPPREP
PREPPREP
PREP
ARAARA
ARAARA
ARA
TIONSTIONS
TIONSTIONS
TIONS
REMOREMO
REMOREMO
REMO
VING OLD VING OLD
VING OLD VING OLD
VING OLD
THERMOSTTHERMOST
THERMOSTTHERMOST
THERMOST
AA
AA
A
TT
TT
T
DescriptionDescription
DescriptionDescription
Description
1F85-2751F85-275
1F85-2751F85-275
1F85-275
Heat Pump (No Aux. or Emergency Heat) Yes
Heat Pump (with Aux. or Emergency Heat) Yes
Standard Heat & Cooling Systems Yes
Two Stage Heat & Two Stage Cool Yes
Standard Heat Only Systems Yes
Millivolt Heat Only Systems – Floor or Wall Furnaces Yes
Standard Central Air Conditioning Yes
Gas or Oil Heat Yes
Electric Furnace Yes
Hydronic (Hot Water) Zone Heat – 2 Wires Yes
Hydronic (Hot Water) Zone Heat – 3 Wires No
Before removing wires from old thermostat's switching sub-
base,
label each wirelabel each wire
label each wirelabel each wire
label each wire with the terminal designation it was
removed from.
1. Shut off electricity at the main fuse box until installation is
complete. Ensure that electrical power is disconnected.
2.
Remove Old ThermostatRemove Old Thermostat
Remove Old ThermostatRemove Old Thermostat
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.
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.
3. Remove the front cover of the old thermostat.
WithWith
WithWith
With
wireswires
wireswires
wires
still attachedstill attached
still attachedstill attached
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.
5. Disconnect the wires from the old thermostat one at a
time.
DO NOT LET WIRES FALL BACK INTO THEDO NOT LET WIRES FALL BACK INTO THE
DO NOT LET WIRES FALL BACK INTO THEDO NOT LET WIRES FALL BACK INTO THE
DO NOT LET WIRES FALL BACK INTO THE
WALLWALL
WALLWALL
WALL.
6. Install new thermostat using the following procedures.
Assemble tools required as shown below.
YOUR THERMOSTAT REPLACESYOUR THERMOSTAT REPLACES
YOUR THERMOSTAT REPLACESYOUR THERMOSTAT REPLACES
YOUR THERMOSTAT REPLACES
To prevent electrical shock and/or equipment damage,To prevent electrical shock and/or equipment damage,
To prevent electrical shock and/or equipment damage,To prevent electrical shock and/or equipment damage,
To prevent electrical shock and/or equipment damage,
disconnect electric power to system at main fuse ordisconnect electric power to system at main fuse or
disconnect electric power to system at main fuse ordisconnect electric power to system at main fuse or
disconnect electric power to system at main fuse or
circuit breaker box until installation is complete.circuit breaker box until installation is complete.
circuit breaker box until installation is complete.circuit breaker box until installation is complete.
circuit breaker box until installation is complete.
Figure 1 – Thermostat baseFigure 1 – Thermostat base
Figure 1 – Thermostat baseFigure 1 – Thermostat base
Figure 1 – Thermostat base
ATTENTION!ATTENTION!
ATTENTION!ATTENTION!
ATTENTION! This product does not contain mercury. How-
ever, this product may replace a unit which contains mercury.
Do not open mercury cells. If a cell becomes damaged, do
notnot
notnot
not
touch any spilled mercury. Wearing non-absorbent gloves,
clean 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 container. Refer to www.white-rodgers.com for loca-
tion to send the product containing mercury.
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED
FLAT BLADE SCREWDRIVER
WIRE CUTTER/STRIPPER
CAUTION
!
Mounting
Hole
Elec-Gas
Switch
Mounting
Hole
AUTOON
ELEC. GAS
C
OBLW2G
Y2
R
E/W1
Y1
White-Rodgers is a division
of Emerson Electric Co.
www.white-rodgers.com