White Rodgers 1C26 Installation Instructions

Installation Instructions for

Heating only

1C20
and
Heating & Cooling
1C26
YOUR THERMOSTAT REPLACES
Description
Standard Heating & Cooling Systems - 4 or 5 wires
Standard Heat Only Systems
Millivolt Heat 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

MOUNTING SCREWS
ANTICIPAT OR
CAPTIVE SCREWS
1C20
No
Yes
Yes
No
Yes
Yes
Yes
No
No
No
No
SUBBASE
(MODEL 1C26
ONLY)
BASE
COVER
Adaptor Plate
(optional)
Figure 1.
CONTENTS
Preparations ...........................................
Thermostat Features ..............................

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

Mounting and Wiring ..............................
Set Heat Anticipator ...............................
New Thermostat Operation ....................
Specifications .........................................
Troubleshooting ..................................... 8
1
PREPARATIONS
Assemble tools required as shown below.
1C26
Yes
Yes
Yes
Yes
Yes
HAND OR POWER
DRILL WITH 3/16 INCH
Yes
DRILL BIT, IF NEEDED
Yes
No
Yes
No
Failure to follow and read all instructions carefully be-
No
fore installing or operating this control could cause
personal injury and/or property damage
3
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.
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
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.
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1
2
3
4
5
6
7
8
FLAT BLADE SCREWDRIVER WIRE CUTTER/STRIPPER
SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—
THERMOSTAT MUST BE LEVEL TO WORK PROPERLY
CAUTION
!
of the anticipator setting on
PART NO. 37-6335B
Replaces 37-6335A
0835