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BASE
COVER
CAPTIVE SCREWS
MOUNTING SCREWS
Figure 1.
OFF
Installation Instructions for
Cooling only
1C21
CONTENTS
Preparations ...........................................
Thermostat Features ..............................
Removing Old Thermostat .....................
Mounting and Wiring ..............................
New Thermostat Operation ....................
Specifications .........................................
Troubleshooting .....................................
PREPARATIONS
THERMOSTAT FEATURES
REMOVING OLD THERMOSTAT
Before removing wires from old thermostat’s switching subbase,
label each wire with the terminal designation it was removed from.
Some models also include an adaptor plate to cover unpainted
surfaces. Thermostat wires pass through the adaptor plate center
opening.
1. Remove Old Thermostat: A standard heat/cool thermostat
consists of two 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.
PART NO. 37-6370B
Replaces 37-6370A
0835
Failure to follow and read all instructions carefully be-
fore installing or operating this control could cause
personal injury and/or property damage
Assemble tools required as shown below.
YOUR THERMOSTAT REPLACES
Adaptor Plate
(optional)
Description
1C21
Standard Heating & Cooling Systems - 4 or 5 wires No
Standard Cool Only Systems Yes
Millivolt Cool Only Systems - Floor or Wall Furnaces Yes
Standard Central Air Conditioning Yes
Gas or Oil Heat No
Electric Furnace No
Hydronic (Hot Water) Zone Heat - 2 Wires No
Hydronic (Hot Water) Zone Heat - 3 Wires No
Heat Pump (No Aux or Emergency Heat) No
Heat Pump (with Aux or Emergency Heat) No
Baseboard Electric Heating or Line Voltage (120 or 240 Volt) No
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WIRE CUTTER/STRIPPER
SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—
THERMOSTAT MUST BE LEVEL TO WORK PROPERLY
FLAT BLADE SCREWDRIVER
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED
To prevent electrical shock and/or equipment damage,
disconnect electrical power to the system at the main
fuse or circuit breaker until installation is complete.
CAUTION
!
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 not
touch any spilled mercury. Wearing non-absorbent gloves, take
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-rodger.com for location to send the
product containing mercury.
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