![background image](http://html1.mh-extra.com/html/carrier/a180218c/a180218c_installation-instructions-manual_2562410106.webp)
96
8. Wiring Diagrams
A
B
C
D
A
B
C
D
User Interface
Green - Data A
Yellow - Data B
White - COM
Red - 24VAC
OAT
Optional Remote
Room Sensor
HUM
COM
24V
Humidifier
Connection
S2
S1
A
B
C
D
ABCD
Connections
Communicating
AC, HP or GHP*
Green
Yellow
White
Red
OAT
Sensor
(Optional)
Variable-Speed
Furnace/ Fan Coil
*NOTE: Some outdoor units do not require the “C” and “D” connections.
See outdoor unit Installation Instructions.
*NOTE: For SPP products, ABCD connection between Indoor and Outdoor
control boards are pre-wired at the factory.
*NOTE: For new SPP installations in which the OAT Sensor is required,
please refer to the SPP Installation Instructions.
A160107
Universal Four--Wire Connection
Summary of Contents for A180218C
Page 64: ...54 A160188C...
Page 112: ...102 A160170 NIM Chart...
Page 113: ...103 A160171 Wiring Diagram Single Stage Non Communicating Heat Pump NIM...
Page 114: ...104 A160172 Wiring Diagram Two Stage Non Communicating Heat Pump NIM...
Page 115: ...105 R G FE Fan Coil or Variable Speed Furnace A07114 G Input Wiring for Blower Operation...
Page 116: ...106 R G FE Fan Coil or Variable Speed Furnace A07115 G Input Wiring for System Shutdown...
Page 119: ...109 NOTES...