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18
WIRING DIAGRAMS
8
Typical Lennox HP19, HP20 Heat Pumps
THERMOSTAT TERMINAL BLOCK
HEATPUMPPCB
R
V-VR
M
Y
E
F
R
X
Y1 Y2 W2 E
G
O B
L C
Typical Lennox Heat Pumps (also see other Lennox diagrams)
THERMOSTAT TERMINAL BLOCK
HEATPUMPPCB
R
R
Y
W1
E
G
O
L
C
Y1 Y2 W2 E G O B L C
Typical Lennox HP21 Heat Pump
THERMOSTAT TERMINAL BLOCK
HEATPUMPPCB
R
R-VR
Y1
W1
E
F
O
L
X
Y1
Y2
W2 E G O B L C
cont.
19
Typical Lennox HP22 Heat Pump
THERMOSTAT TERMINAL BLOCK
HEATPUMPPCB
R
R-VR
M
Y2
Y
E
F
R
X
L
Y1
Y2
W2
E
G
O B
L C
Typical Weathertron Heat Pumps
THERMOSTAT TERMINAL BLOCK
HEATPUMPPCB
R
R
Y
W-U
G
O
B
T
X2
Y1 Y2
W2 E
G
O B L C
Typical Trane Heat Pumps
THERMOSTAT TERMINAL BLOCK
HEATPUMPPCB
R
R
Y
W
X2
G
O
F
B
Y1 Y2 W2 E G O B L C
CAPPED
CAPPED
User
Supplied
Jumper
WIRING DIAGRAMS
8
cont.