ION SYST0101CW Installation Instructions Manual page 52

User Interface
DX+
DX-
C
R
S1
Optional Remote
Room Sensor
S2
Connection Diagram for Furnace or FCM4 Fan Coil with
Variable-Speed
Furnace/Fan Coil
Green - Data A
Yellow - Data B
White - COM
Red - 24VAC
Humidifier
Connection
1-Stage Air Conditioning
52
DX+
DX-
Communications
Connection
C
R
Non-Communicating
HUM
COM
24V
Y/Y2
OAT
1-Spd.
AC
C
Y
OAT
Sensor
A12354I