12
18-AC78D1-6
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.
11.2 Low Voltage Hook-up Diagrams
Air Handler Hook-up Diagram
Red
Yellow
Green
White
Blue
Yellow
Green
White
Blue
B
B
B - Blue
Blue
W
W1
W2
W3
G
G
Y
Y - Yellow
Yellow
Low Voltage connection
must be made inside the
outdoor unit case.
R
R
Red
Comfort Control
Air Handler
Air Conditioner
Factory wiring
Variable Speed Air Handler
Hook-up Diagram
Red
Yellow
Green
White
Blue
Yellow
Green
White
Blue
B
B - Blue
Blue
W
G
Y
Y - Yellow
Yellow
Low Voltage connection
must be made inside the
outdoor unit case.
R
Red
Comfort Control
Variable Speed
Air Handler
Air Conditioner
Factory wiring
W1
W2
W3
G
Y/Y2
B
O
BK
Y
LO
/Y1
R
Field provided bushing or strain relief is required at
the low voltage wire entry point.