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Heating Systems
GYWRHBORC
Tape Off *
* If replacing a Honeywell TM-11,
tape off wire “R”; connect wire “B”
to terminal “RH.”
** If replacing a Honeywell thermostat
with a clock wire “C,” tape off wire “C”
G
5
4
B
RC
V
R
*
H
W
F
RH
Tape Off **
C
Tape Off
TC
FAN RELAY
COOLING COMPRESSOR
HEATING CONTROL
HEATING TRANSFORMER
DAMPER OR CHANGEOVER VALVE
(POWERED IN HEAT)
DAMPER OR CHANGEOVER VALVE
(POWERED IN COOL)
COOL TRANSFORMER
Cooling Systems
GYWRHBORC
Y
V
R
C
R
C
G
F
T
C
Tape Off
FAN RELAY
COOLING COMPRESSOR
HEATING CONTROL
HEATING TRANSFORMER
DAMPER OR CHANGEOVER VALVE
(POWERED IN HEAT)
DAMPER OR CHANGEOVER VALVE
(POWERED IN COOL)
COOL TRANSFORMER
* If both Y and C wire are
present, tape off “C” wire.
*
Heating/Cooling Systems
4- or 5-Wire with One Transformer
GYWRHBORC
C
Y
G
F
W
V
R
RC
B
O
(Optional)
(Optional)
Tape Off
T
C
FAN RELAY
COOLING COMPRESSOR
HEATING CONTROL
HEATING TRANSFORMER
DAMPER OR CHANGEOVER VALVE
(POWERED IN HEAT)
DAMPER OR CHANGEOVER VALVE
(POWERED IN COOL)
COOL TRANSFORMER
* If both Y and C wire are
present, tape off “C” wire.
*
FAN RELAY
COOLING COMPRESSOR
HEATING CONTROL
HEATING TRANSFORMER
DAMPER OR CHANGEOVER VALVE
(POWERED IN HEAT)
DAMPER OR CHANGEOVER VALVE
(POWERED IN COOL)
COOL TRANSFORMER
Heating/Cooling Systems
5- or 6-Wire with Two Transformers
GYWRHBORC
Y
C
G
F
W
4
A
RH
B
O
(Optional)
(Optional)
V
R
R
C
Tape Off
TC
*
* If both Y and C wire are
present, tape off “C” wire.
WIRING DIAGRAMS