Section 11. Electrical - Low Voltage - Trane 4TTM3018 Installer's Manual

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.
Field provided bushing or strain relief is required at
the low voltage wire entry point.
11.2 Low Voltage Hook-up Diagrams
Air Handler Hook-up Diagram
Comfort Control
Red R
Yellow Y
Green
G
White
W
Blue
B
Factory wiring
Variable Speed Air Handler
Hook-up Diagram
Comfort Control
Red R
Yellow Y
Green
G
White W
Blue
B
Factory wiring
12
Air Handler
R
Red
Yellow
Green
G
White
Blue
W1
W2
W3
B
Variable Speed
Air Handler
R
Red
BK
Yellow
O
Green
Y /Y1
LO
White
Y/Y2
Blue
G
W1
W2
W3
B
WIRE SIZE
18 AWG
16 AWG
14 AWG
Low Voltage connection
must be made inside the
outdoor unit case.
Y - Yellow
B - Blue
Low Voltage connection
must be made inside the
outdoor unit case.
Y - Yellow
B - Blue
Table 11.1
24 VOLTS
MAX. WIRE LENGTH
150 Ft.
225 Ft.
300 Ft.
Yellow
Blue
Air Conditioner
Yellow
Blue
Air Conditioner
18-AC78D1-6