18-AC104D1-1E-EN 13
11.2 Low Voltage Hook-up Diagrams
Section 11. Electrical - Low Voltage
11.1 Low Voltage Maximum Wire Length
Table 11.1 defines the maximum total length of
low voltage wiring from the outdoor unit, to the
indoor unit, and to the thermostat.
Table 11.1
24 VOLTS
WIRE SIZE MAX. WIRE LENGTH
18 AWG 150 Ft.
16 AWG 225 Ft.
14 AWG 300 Ft.
Thermostat Air Handler
Outdoor
Unit
R
G
B
W1
W2
R
B
O
Y
X2
R
G
B/C
O
Y
W
Blue
24 VAC HOT
FAN
24 VAC
Common
SOV
COOL/HEAT
1st STAGE
HEATING
2nd STAGE
EMERGENCY
HEAT
Pink Black
White
X2
O
Y*
Thermostat Air Handler
Outdoor
Unit
R
G
B
W1
W2
R
B
O
Y
O
Y
O
X2
R
G
B/C
O
Y
l
W
Blue
O
Y
l
24 VAC HOT
FAN
24 VAC
Common
SOV
COOL/HEAT
1st STAGE
HEATING
2nd STAGE
EMERGENCY
HEAT
Pink Black
White
X2
Units with pigtails require wirenuts for connections.
In AC systems for multiple stages of electric heat, jumper W1 and W2 together if comfort control has only one stage of heat