HeaT PumP
Hunter Carrier Coleman Comfortmaker Bryant, Payne Rheem Ruud Trane,
Weathertron York Lennox (1) Lennox (2)
RRRRRRRRRV-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
GGGGGGGGGF
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 Mounting Plate
Wall
RH
RC
Y
G
W
W2
Y2
C
A
RH
Y
G
W
Jumper
Heat Power
Cool Contactor
Fan Relay
Heat Contactor

3 Wire Cool Only

ermostat Mounting Plate
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 Mounting Plate
Wall
RH
RC
Y
G
W
W2
Y2
C
A
RH
W
Jumper
Heat Power
Heat Contactor

4 Wire with Common

ermostat Mounting Plate
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 Mounting Plate
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 Mounting Plate
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 Mounting Plate
Wall
RH
RC
Y
G
W
W2
Y2
C
A
RH
W
A
Jumper
Heat Power
Heat Contactor
Damper Valve

Conventional Multi-Stage

ermostat Mounting Plate
Wall
RH
RC
Y
G
W
W2
Y2
C
A
RC
Y
G
W
W2
Y2
Jumper
Heat Power
Cool Contactor
Fan Relay
Heat Contactor
Second Stage Heat
Second Stage Cool

Single Stage Heat Pump

ermostat Mounting Plate
Wall
R
Y
G
L
O
B
Aux/E
Y2
C
R
Y
G
O
Jumper
Heat 24V Supply
Compressor Contact
Fan Relay
Cool Relay / Valve
ermostat Mounting Plate
R
Y
G
L
O
B
Aux/E
Y2
C

Single Stage Heat Pump W/Aux Heat

Wall
R
Y
G
O
E
C
Jumper
Heat 24V Supply
Compressor Contact
Fan Relay
System Monitor*
Cool Relay / Valve
Auxiliary Heat
Common*
* The common wire “C” and system monitor wire “L” may or
may not be present.
L

Single Stage Heat Pump W/Heat Reversing

ermostat Mounting Plate
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
Compressor Contact
Fan Relay
System Monitor*
Heat Relay / Valve
Auxiliary Heat
Common*

Multi-Stage Heat Pump

ermostat Mounting Plate
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
Compressor Contact
Fan Relay
System Monitor*
Cool Relay / Valve
Auxiliary Heat
Second-Stage Cool
Common*