HEAT PUMP
Hunter Carrier Coleman Comfortmaker Bryant, Payne Rheem Ruud
Trane,
Weathertron
York Lennox (1) Lennox (2)
R R R R R R R R R V-VR
Y Y or Y1 Y Y Y Y Y Y Y M
E W2 W2 W1 W2 W2 W W W1 Y
E E Jumper to W2 E E X2 Jumper to W2 E E
O O O O O O O R
B B B
G G G G G G G G G F
L L or F L L or X L L X L
C C X C, X, X1 C, X, X1 X B B C X
Figure 4.
CONVENTIONAL
4 Wire Heat / Cool
ermostat Backplate
Wall
RH
RC
Y
G
W
W2
Y2
C
A
RH
Y
G
W
Jumper
Cool Power
Cool Contactor
Fan Relay
Heat Contactor
3 Wire Cool Only
ermostat Backplate
Wall
RH
RC
Y
G
W
W2
Y2
C
A
RC
Y
G
Jumper
Cool Power
Cool Contactor
Fan Relay
2 Wire Heat Only
ermostat Backplate
Wall
RH
RC
Y
G
W
W2
Y2
C
A
RH
W
Jumper
Heat Power
Heat Contactor
4 Wire with Common
ermostat Backplate
Wall
RH
RC
Y
G
W
W2
Y2
C
A
RH
Y
G
W
C
Jumper
Heat Power
Cool Power
Cool Contactor
Fan Relay
Heat Contactor
Common
5 Wire Heat / Cool
ermostat Backplate
Wall
RH
RC
Y
G
W
W2
Y2
C
A
Heat Power
Cool Power
Cool Contactor
Fan Relay
Heat Contactor
RH
RC
Y
G
W
3 Wire Heat Only
ermostat Backplate
Wall
RH
RC
Y
G
W
W2
Y2
C
A
RH
G
W
Jumper
Heat Power
Fan Relay
Heat Contactor
3 Wire Hot Water with Damper Valve
ermostat Backplate
Wall
RH
RC
Y
G
W
W2
Y2
C
A
RH
W
A
Jumper
Heat Power
Heat Contactor
Damper Valve
Conventional Multi-Stage
ermostat Backplate
Wall
RH
RC
Y
G
W
W2
Y2
C
A
RC
Y
G
W
W2
Y2
Jumper
Cool Power
Cool Contactor
Fan Relay
Heat Contactor
Secondary Heat
Secondary Cool
Single Stage Heat Pump
ermostat Backplate
Wall
R
Y
G
L
O
B
Aux/E
Y2
C
R
Y
G
O
Jumper
Heat 24V Supply
Cool Contactor
Fan Relay
Heat Relay / Valve
ermostat Backplate
R
Y
G
L
O
B
Aux/E
Y2
C
Multi-Stage Heat Pump
Wall
R
Y
G
O
E
C
Jumper
Heat 24V Supply
Cool Contactor
Fan Relay
System Monitor*
Heat Relay / Valve
Second Stage Heat
Common*
* The common wire “C” and system monitor wire “L” may or
may not be present.
L
Multi-Stage Heat Pump Heat Reversing
ermostat Backplate
Wall
R
Y
G
L
O
B
Aux/E
Y2
C
R
Y
G
B
C
Jumper
L
* The common wire “C” and system monitor wire “L” may or
may not be present.
E
Heat 24V Supply
Cool Contactor
Fan Relay
System Monitor*
Cool Relay / Valve
Emergency Heat
Common*
Triple-Stage Heat Pump
ermostat Backplate
Wall
R
Y
G
L
O
B
Aux/E
Y2
C
R
Y
G
L
O
E
Y2
C
Jumper
* The common wire “C” and system monitor wire “L” may or
may not be present.
Heat 24V Supply
Cool Contactor
Fan Relay
System Monitor*
Heat Relay / Valve
Secondary Heat
Back-up Heat
Common*
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