White Rodgers 1C21 User Manual
CONTENTS
CAUTION
!
Installation Instructions for
Cooling only
1C21
YOUR THERMOSTAT REPLACES
Description
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
1C21
Preparations...........................................
Thermostat Features..............................
Removing Old Thermostat .....................
Mounting and Wiring ..............................
New Thermostat Operation ....................
Specifications .........................................
Troubleshooting .....................................
PREPARATIONS
1
Assemble tools required as shown below.
FLAT BLADE SCREWDRIVER
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED
SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—
THERMOSTAT MUST BE LEVEL TO WORK PROPERLY
Failure to follow and read all instructions carefully before installing or operating this control could cause
personal injury and/or property damage
1
2
3
4
5
6
7
WIRE CUTTER/STRIPPER
THERMOSTAT FEATURES
2
CAPTIVE SCREWS
OFF
COVER
Figure 1.
MOUNTING SCREWS
BASE
Adaptor Plate
(optional)
REMOVING OLD THERMOSTAT
3
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.
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.
ATTENTION! This product does not contain mercury. However, 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.
www.white-rodgers.com
PART NO. 37-6370B
Replaces 37-6370A
0835
MOUNTING AND WIRING
4
WARNING
!
Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could cause
shock or fire hazard.
Do not short out terminals on gas valve or primary
control to test. Short or incorrect wiring will damage
thermostat and could cause personal injury and/or
property damage.
Thermostat installation and all components of the system shall conform to Class II circuits per the NEC code.
A. Mount base and adaptor plate: Mount base and adaptor
plate (optional) to wall using screws provided (see Fig. 1).
B. Attach wires: Attach one wire to R and the other wire to Y on
base.
C. Snap on cover: Carefully align the cover with the base and
snap the cover onto the base.
CAUTION
!
Take care when securing and routing wires so they do
not short to adjacent terminals or rear of thermostat.
Personal injury and/or property damage may occur.
NEW THERMOSTAT OPERATION
5
After power is turned on, slide temperature lever to desired
setting. To turn cool off, slide lever all the way to the left until it
clicks.
SPECIFICATIONS
6
ELECTRICAL DATA
Switch Rating ........................24 VAC (30 VAC max.)
Cooling ....................................0 to 1.5 Amps
Switch Action ........................Snap Action
Anticipator Rating:
Cooling ....................................Fixed
THERMAL DATA:
Temperature Range .............. 50°F to 90°F (10°C to 32°C)
Operating Humidity Range ... 0 – 90% noncondensing
TERMINAL CROSS REFERENCE CHART
New Thermostat
Terminal Designation
R
Y
Other Manufacturers’
Terminal Designation
V
C
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