White Rodgers 1F56N-911, 1C26-101, 1C21-101, 1C20-101, 1C20-102 Supplemental Wiring
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 GA
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 BO YG 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
CONFIGURATION AND
TYPICAL WIRING
CONFIGURATION
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: 1) 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.
1C20/1C21/1C26/
1D56/1E56/1F56
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.
NOTE: Some thermostat
models don’t include all
terminals as shown here.
TYPICAL WIRING DIAGRAMS
www.white-rodgers.com
TECHNICAL HELP
191
Loading...