Carrier Infinity SYSTXCCITW01 Installation Instructions Manual page 16

NOTE: ABCD bus wiring only requires a four- - wire connection; however, it is
good practice to run thermostat cable having more than four wires in the event of a
damaged or broken wire during installation.
Each communicating device in the Infinityr Zone System has a four- - pin connector
labeled ABCD. It is recommended that the following color code be used when
wiring each device:
A — Green = Data A
B — Yellow = Data B
C — White = 24VAC (Com)
D — Red = 24VAC (Hot)
A B C D
A03193
It is not mandatory that the above color code be used, but each ABCD connector in
the system MUST be wired consistently.
NOTE: Some outdoor units provide their own low- - voltage power source and do
not require the "C" (24VAC common) and "D" (24VAC power) connections. See
the outdoor unit installation instructions for more information.
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