White Rodgers 1C21 Installation Instructions

Installation Instructions for
Cooling only
1C21
YOUR THERMOSTAT REPLACES
Description
Standard Heating & Cooling Systems - 4 or 5 wires
Standard Cool Only Systems
Millivolt Cool Only Systems - Floor or Wall Furnaces
Standard Central Air Conditioning
Gas or Oil Heat
Electric Furnace
Hydronic (Hot Water) Zone Heat - 2 Wires
Hydronic (Hot Water) Zone Heat - 3 Wires
Heat Pump (No Aux or Emergency Heat)
Heat Pump (with Aux or Emergency Heat)
Baseboard Electric Heating or Line Voltage (120 or 240 Volt)
2

THERMOSTAT FEATURES

CAPTIVE SCREWS
Figure 1.
1C21
No
Yes
Yes
Yes
No
No
No
No
No
No
No
MOUNTING SCREWS
BASE
COVER
Adaptor Plate
(optional)
www.white-rodgers.com
CONTENTS
Preparations ...........................................
Thermostat Features ..............................

Removing Old Thermostat .....................

Mounting and Wiring ..............................
New Thermostat Operation ....................
Specifications .........................................
Troubleshooting .....................................
1
PREPARATIONS
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 be-
fore installing or operating this control could cause
personal injury and/or property damage
3
REMOVING OLD THERMOSTAT
CAUTION
!
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. 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.
1
2
3
4
5
6
7
WIRE CUTTER/STRIPPER
PART NO. 37-6370B
Replaces 37-6370A
0835