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4.4. Wiring Considerations
Ordinary thermostat wire is recommended. See Shielded Wire and Communication Bus
Configuration Section for notes on shielded wire. Continuous wire lengths over 25 ft. should
use 18 AWG wiring.
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 Evolution 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)
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, typically those with multiple compressor stages, 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.
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or death.
Before installing, modifying, or servicing system, the main electrical disconnect switch must
be in the OFF position. There may be more than one disconnect switch. Lock out and tag
switch with a suitable warning label.
4.4.1. Shielded Wire and Communication Bus Configuration
If the thermostat wiring will be located near or in parallel with high voltage wiring, radio, TV or
Ethernet wiring, then four conductor, twisted-pair, shielded cable can be used to reduce or
WARNING
!
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A
B
C
D
A03193
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