21
NOTE: See step c (page 11).
Y
R
C
Outdoor
Unit
A/H #1
C R Y G W
W
G
Y
R
Thermostat
1
A/H #2
1
See step d
(page 11).
C R Y G W
Figure 11. Low Voltage Wiring For Twinning
Figure 10. Typical Thermostat Connections
G
R
C
W/EO
Y
Thermostat
G
R
W
Thermostat
Y
C
Y
G
R
W
Thermostat
Y
C
Air
Handler
Air
Conditioner
Y
Typical Air Conditioner with
Standard Air Handler
GRC
E
O
Y
Thermostat
Typical Heat Pump with
Standard Air Handler
Typical Air Conditioner with
2-Stage Air Handler
Typical Heat Pump with
2-Stage Air Handler
G
R
W2
C
O
Y1
Thermostat
O
Y1
R
C
G
R
W/E
Thermostat
Y1
C
Y1
W2
Typical 2-Stage Air Conditioner
with 2-Stage Air Handler
Typical 2-Stage Heat Pump with
2-Stage Air Handler
Y2
Y2
Y2
Y2 OUT
W/E
R
Air
Conditioner
Air
Handler
Air
Conditioner
Air
Handler
Heat Pump
Air
Handler
Heat Pump
O
R
C
Y
Air
Handler
Heat Pump
NOTE: Jumper between
W2 & E is required when
no OD T- Stat is used.
W1
Y
G
R
C
NOTE: Jumper W1 & W2
together if not using W2
on thermostat
Y1
W2
W1
O
Y/Y2
G
R
C
Y1
W2
W1
O
Y/Y2
G
R
C
W2
Air
Handler
W1
Y
G
R
C
R
C
Y
W2
O
Y1
W2
W1
O
Y/Y2
G
R
C
Y1
W2
W1
O
Y/Y2
G
R
C
W2
W2
W2
NOTE: Jumper W1 & W2
together if not using W2
on thermostat
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