White Rodgers 1C26-101 Single Stage Setpoint Thermostat Supplemental Wiring

White Rodgers Thermostats Supplemental Wiring - 1C26-101 Single Stage Setpoint Thermostat.
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TECHNICAL HELP

1C20/1C21/1C26/

1D56/1E56/1F56

RH

W

B

O

Y

G

RC

A

24 VAC

120 VAC

Hot

Neutral

TRANSFORMER

Heat

Relay

Compressor

Relay

Fan

Relay

*

* *

Factory or Field-Installed Jumper

Single transformer heating/cooling system

*

* *

Terminal energized

in cooling

Terminal energized

in heating

Terminal "A" is not 
for field wiring. See 
SPECIAL SYSTEM 
CONFIGURATIONS 
section for proper 
use of terminal "A".

Two-transformer heating/cooling system

RH

W

B

O

Y

G

A

24 VAC

120 VAC

Hot

Neutral

TRANSFORMER

Heat

Relay

Compressor

Relay

Fan

Relay

*

* *

*

* *

Terminal energized

in cooling

Terminal energized

in heating

24 VAC

120 VAC

Hot

Neutral

TRANSFORMER

RC

NOTE:  Remove  factory- 
installed jumper between 
RC and RH terminals for 
this application.

Terminal "A" is not for field wiring. 
See SPECIAL SYSTEM 
CONFIGURATIONS section for 
proper use of terminal "A".

Single transformer, single stage heat pump system

W

B

O

Y

G

A

24 VAC

120 VAC

Hot

Neutral

TRANSFORMER

Compressor

Relay

Fan

Relay

*

* *

Factory or Field-Installed Jumper

*

* *

Terminal energized

in cooling

Terminal energized

in heating

RH

Field-Installed Jumper

RC

Terminal "A" is not for field wiring. 
See SPECIAL SYSTEM 
CONFIGURATIONS section for 
proper use of terminal "A".

.18

.25

.3

.4

.2

.15

1.

.8

.6

.5

Arrow points to the

matched current rating

of the primary control

Move this lever to

adjust heat

anticipator

Anticipator adjustment

L

O

N G E R C

Y

C

L

E

S

Electric Heat Furnaces
(Single Transformer Systems Only)

The thermostat as shipped may not operate the fan correctly. If 

both the heating and cooling system must operate the fan relay, 

remove the yellow factory-installed jumper wire from the Y terminal 

and connect it to the A terminal. The fan should now cycle when the 

termostat calls for either heat or cool.

Heat Pump Applications

This thermostat WILL NOT provide multi-stage heating or cooling 

operation. For single-stage heat pump applications, install a short 

jumper wire across terminals W and Y. If the old thermostat has a 

terminal that is continuously energized, disconnect the wire from the 

old thermostat’s terminal and connect it either to the: ) B terminal, 

if the reversing valve is energized on a call for heat: or to the 2) O 

terminal, if the reversing valve is energized on a call for cool. If the 

system heats on a call for cool, or vice versa, this wire has been 

connected to the wrong terminal.

Special Application Terminals

The B and O terminals can provide switching for special functions 

other than heat pump operation. When the system switch is in the 

HEAT position, the B terminal is energized. When the system switch 

is in the COOL position, the O terminal is energized.

CONFIGURATION

TYPICAL WIRING DIAGRAMS

NOTE: Some thermostat
models don’t include all
terminals as shown here.

CONFIGURATION AND

TYPICAL WIRING

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