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Air Handlers
④. Connect the wires firmly to the wiring box. Incomplete installation may lead to
fire hazard.
⑤. Please use wire clamps to secure the external covers of connecting wires.
(Insulators must be clamped securely; otherwise, electric leakage may occur.)
⑥. Ground wire should be connected.
Wires of indoor unit (Only for air handler without electric heater)
NOTE: Y means Compressor control signal for the outdoor unit;
B which is energized under the heating mode means 4-way valve control
signal;
D means defrosting signal;
R means 24V AC power supply;
C means 24V common;
G means indoor unit fan signal for the indoor unit;
W1 means heater control signal.
NOTE: For cooling only unit, there is no need to connect the B and D
terminals.
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