Air Handler - Trane 4TWB4018G Installer's Manual

11.2 Low Voltage Hook-up Diagrams

Air Handler

Hook-up Diagram
Comfort Control
Red
R
Yellow
Y1
Green
G
White
W1
X2
Blue
B
O Orange
Communicating Indoor Unit
with 24 V Control Hook-up
Diagram
Comfort Control
Red
R
Yellow
Y1
Green
G
White
W1
X2
Blue
B
Orange
O
18-BC77D1-6
Neatly bundle all low voltage
wires behind the service
valve cover as shown.
Air Handler
Red
R
Y
LO
Yellow
Y
BK
G
W1
W2
W3
B
O
Neatly bundle all low voltage
wires behind the service
valve cover as shown.
Comm. Variable Speed
Furnace or Air Handler
Red
R
BK
D
Yellow
Y1
Y2
G
W1
W2
W3
B
O
Heat Pump
Red
Yellow
Black
Blue
Heat Pump
Red
Black
Yellow
Black
Blue
Orange
Notes:
1. If electric heat does
Orange
not have 3rd contactor
(CH), connect a jumper
wire from W3 to W2. If
Black
electric heat does not
Blue
(X2)
have 2nd contactor
(BH), connect a jumper
wire from W2 to W1.
2. Ylo and BK may not be
present on unit.
3. W1 - X2 is a field
installed jumper.
Orange
Notes:
1. See User Interface 24
V Mode setup menu
for control mode and
cooling CFM options.
2. W3 terminal may not
be present on unit.
3. (Air Handlers only) If
Orange
electric heat does not
have 3rd contac-
tor (CH), connect
Blue
(X2)
a jumper wire from
W3 to W2. If electric
heat does not have
2nd contactor (BH),
connect a jumper wire
from W2 to W1.
4. W1 - X2 is a field
installed jumper.
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