White Rodgers 1C21 installation instructions Your Thermostat Replaces, Contents, Preparations

Installation Instructions for

Cooling only

1C21

YOUR THERMOSTAT REPLACES

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

CONTENTS
Preparations	1
Thermostat Features	2
Removing Old Thermostat	3
Mounting and Wiring	4
New Thermostat Operation	5
Specifications	6
Troubleshooting	7

1 PREPARATIONS

Assemble tools required as shown below.

FLAT BLADE SCREWDRIVER WIRE CUTTER/STRIPPER

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

2 THERMOSTAT FEATURES

MOUNTING SCREWS

CAPTIVE SCREWS

BASE

COVER

	Adaptor Plate
Figure 1.	(optional)

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.

	PART NO. 37-6370B
www.white-rodgers.com	Replaces 37-6370A
	0835