14
18-AC74D1-4
Red
Yellow
Green
White
Black
Blue
Red
Brown
Blue
W1
B
W2
G
Y1
R
Comfort Control
Comm. Variable Speed
Furnace or Air Handler
B
D
R
Communicating
Comfort Control
(*CONT900)
Comm. Variable Speed
Furnace or Air Handler
Air Conditioner
Air Conditioner
W1
W2
W3
G
Y2
B
O
BK
D
Y1
R
Neatly bundle all low voltage
wires behind the service
valve cover as shown.
W1
W2
W3
G
Y2
B
O
BK
D
Y1
R
Neatly bundle all low voltage
wires behind the service
valve cover as shown.
Yellow
Yellow
Blue
Blue
Yellow
Yellow
Blue
Blue
Notes:
1. See User Interface
setup menu for cooling
CFM options.
2. W3 terminal may not
be present on unit.
Notes:
1. See User Interface setup
menu for 24 VAC control
mode and cooling CFM
options.
2. W3 terminal may not be
present on unit.
3. If single stage heating
thermostat is used, jumper
W1-W2 on furnace termi-
nal strip.
Communicating Indoor Unit
with 24 V Control Hook-up
Diagram
Communicating Indoor Unit
in Comm. Mode
Hook-up Diagram
