Install Manual

ManualsBrandsWhite Rodgers Manualsdigital body thermometers1C20-102

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 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.

Make a note here of the anticipator setting

on the old thermostat for future reference and use in step 5.

The heat anticipator pointer, if adjustable, will be set at one of a

series of numbers representing the current rating of the primary

control in your furnace. The number will be one of the following:

.2, .4, .8, etc. or 0.2, 0.4, 0.8, etc.

If no heat anticipator/indication is showing, do not be concerned;

move on to the next step.

THERMOSTAT FEATURES

REMOVING OLD THERMOSTAT

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

1C20 – Heating Only

1C26 – Heating & Cooling

INSTALLATION AND OPERATION INSTRUCTIONS

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY

BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE

PERSONAL INJURY AND/OR PROPERTY DAMAGE.

Operator: Save these instructions for future use!

YOUR THERMOSTAT REPLACES

Description 1C20 1C26

Standard Heating & Cooling Systems - 4 or 5 wires No Ye s

Standard Heat Only Systems Ye s Ye s

Millivolt Heat Only Systems - Floor or Wall Furnaces Ye s Ye s

Standard Central Air Conditioning No Ye s

Gas or Oil Heat Ye s Ye s

Electric Furnace Ye s Ye s

Hydronic (Hot Water) Zone Heat - 2 Wires Ye s Ye s

Hydronic (Hot Water) Zone Heat - 3 Wires No No

Heat Pump (No Aux or Emergency Heat) No Ye s

Heat Pump (with Aux or Emergency Heat) No No

Baseboard Electric Heating or Line Voltage (120 or 240 Volt) No No

white-rodgers.com

emersonclimate.com

PART NO. 37-6335C

Replaces 37-6335B

1640

SUBBASE

(MODEL 1C26

ONLY)

BASE

COVER

ANTICIPATOR

CAPT

IVE SCREWS

MOUNTING SCREWS

Figure 1.

SUBBASE

(MODEL 1C26

ONLY)

BASE

COVER

ANTICIPATOR

CAPTIVE SCREWS

MOUNTING SCREWS

Figure 1.

Adaptor Plate

(optional)

Failure to follow and read all instructions carefully

before installing or operating this control could cause

personal injury and/or property damage

Assemble tools required as shown below.

PREPARATIONS

WIRE CUTTER/STRIPPER

SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—

THERMOSTAT MUST BE LEVEL TO WORK PROPERLY

FLAT BLADE SCREWDRIVER

HAND OR PO

WER

DRILL

WITH 3/16 INCH

DRILL BI

T, IF NEEDED

Summary of content (4 pages)

PAGE 1
C20 – Heating Only 1C26 – Heating & Cooling INSTALLATION AND OPERATION INSTRUCTIONS Operator: Save these instructions for future use! FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE. 1 PREPARATIONS Assemble tools required as shown below.
PAGE 2
3 REMOVING OLD THERMOSTAT CONTINUED FROM FIRST PAGE 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.
PAGE 3
5 SET HEAT ANTICIPATOR Set anticipator to match the setting of your old thermostat you noted in Step 3, or, the anticipator should be set to match the current rating stamped on your main heating control. The heat anticipator is adjustable from 0.15 to 1.2 amps. Adjust the anticipator by rotating the contact arm (see fig. 5).The anticipator setting is indicated by the numbers on the base that the pointer points to.
PAGE 4
8 TROUBLESHOOTING Symptom Possible Cause Corrective Action No Heat/No Cool/No Fan (common problems) 1. Blown fuse or tripped circuit breaker. 2. Furnace power switch to OFF. 3. Furnace blower compartment door or panel loose or not properly installed. 1. Pilot light not lit. 2. Broken or melted anticipator wire. Replace fuse or reset breaker. Turn switch to ON. Replace door panel in proper position to engage safety interlock or door switch. Re-light pilot. Excessive current or dead short in system.