Trane 4TTM3018 Installer's Manual page 13

1 or 2 Stage Gas Furnace
Hook-up Diagram
Comfort Control
Red R
Yellow
Y
Green
G
White
W1
Black W2*
Blue
B
* W2 is present only on 2 stage comfort control and furnace
Factory wiring
Variable Speed Gas Furnace
Hook-up Diagram
Comfort Control
Red R
Yellow Y1
Yellow
Y2
Green G
White
W1
Black W2*
Blue B
* W2 is present only on 2 stage comfort control and furnace
Factory wiring
Notes:
1. Be sure power supply agrees with equipment nameplate.
2. Power wiring and grounding of equipment must comply with local codes.
3. Low voltage wiring to be No. 18 AWG minimum conductor.
4. ODT-B must be set lower than ODT-A.
5. If outdoor thermostats (ODT) are not used, connect W1 to W2 and W3.
18-AC78D1-6
1 or 2 Stage Gas Furnace
Red
R
Yellow
Y
Green
G
White
W1
Black
W2
Blue
B
Variable Speed Gas Furnace
R
BK
Red
O
Yellow
Y /Y1
LO
Y/Y2
Green G
W1
White
Black
W2
Blue
B
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
Yellow
Blue
Air Conditioner
Yellow
Blue
Air Conditioner
LEGEND
FACTORY WIRING
FIELD WIRING
13