Figure 4.
Hunter | Carrier | Coleman | Comfortmaker | Bryant, Payne | Rheem Ruud | Trane, | York | Lennox (1) | Lennox (2) | |
Weathertron | ||||||||||
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R | R | R | R | R | R | R | R | R | ||
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 |
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G | G | G | G | G | G | G | G | G | F | |
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L | L or F | L | L or X | L | L |
| X | L |
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C | C | X | C, X, X1 | C, X, X1 | X | B | B | C | X | |
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Conventional
Heat Pump
4 Wire Heat / Cool
5 Wire Heat / Cool
Single Stage Heat Pump
Thermostat Mounting Plate
Jumper
RH
RC
Y
G
W
W2
Y2
C
A
RH | Heat Power | |
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Y | Cool Contactor | |
Fan Relay | ||
G | ||
Heat Contactor | ||
W | ||
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Wall
Thermostat Mounting Plate
RH
RC
Y
G
W
W2
Y2
C
A
RH RC
Y
G
W
Heat Power
Cool Power
Cool Contactor
Fan Relay
Heat Contactor
Wall
Thermostat Mounting Plate
R
Y
G
L
O
B
Aux/E
Y2
C
Jumper | R |
| |
| Y |
| G |
O
Heat 24V Supply
Compressor Contact
Fan Relay
Cool Relay / Valve
Wall
Single Stage Heat Pump W/Aux Heat
3 Wire Cool Only
3 Wire Heat Only
Jumper |
Thermostat Mounting Plate
Jumper
RH
RC
Y
G
W
W2
Y2
C
RC
Y
G
Cool Power
Cool Contactor
Fan Relay
Wall
Thermostat Mounting Plate
Jumper
RH
RC
Y
G
W
W2
Y2
C
RH
G
W
Heat Power
Fan Relay
Heat Contactor
Wall
Thermostat Mounting Plate
R
Y
G
L
O
B
Aux/E
Y2
C
R |
Y |
G |
L
O
E
C
Heat 24V Supply
Compressor Contact
Fan Relay
System Monitor*
Cool Relay / Valve
Auxiliary Heat
Common*
Wall
A
A
*The common wire “C” and system monitor wire “L” may or may not be present.
Single Stage Heat Pump W/Heat Reversing
2 Wire Heat Only
3 Wire Hot Water with Damper Valve
Jumper |
Thermostat Mounting Plate
Jumper
RH
RC
Y
G
W
W2
Y2
C
RH
W
Heat Power
Heat Contactor
Wall
Thermostat Mounting Plate
Jumper
RH
RC
Y
G
W
W2
Y2
C
RH
W
Heat Power
Heat Contactor
Wall
Thermostat Mounting Plate
R
Y
G
L
O
B
Aux/E
Y2
C
R |
Y |
G |
L
B E
C
Heat 24V Supply
Compressor Contact
Fan Relay
System Monitor*
Heat Relay / Valve
Auxiliary Heat
Common*
Wall
A
A
A
Damper Valve
*The common wire “C” and system monitor wire “L” may or may not be present.
4 Wire with Common
Conventional Multi-Stage
Jumper |
Thermostat Mounting Plate
Jumper
RH
RC
Y
G
W
W2
Y2
C
RH
Y
G
W
C
Heat Power
Cool Power
Cool Contactor
Fan Relay
Heat Contactor
Common
Wall
Thermostat Mounting Plate
Jumper
RH
RC
Y
G
W
W2
Y2
C
RC
Y
G
W
W2
Y2
Heat Power
Cool Contactor
Fan Relay
Heat Contactor
Second Stage Heat
Second Stage Cool
Wall
Thermostat Mounting Plate
R
Y
G
L
O
B
Aux/E
Y2
C
R |
Y |
G |
L
O
E
Y2
C
Heat 24V Supply
Compressor Contact
Fan Relay
System Monitor*
Cool Relay / Valve
Auxiliary Heat
Common*
Wall
A
A
*The common wire “C” and system monitor wire “L” may or may not be present.
