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ELECTRICAL WIRING
Graphical Representation for Wiring (cont)
(5) Tighten terminal screws with the proper size screw driver. Undersized screw drivers will damage the screw head and
fail to tighten properly.
(6) If terminal screws are tightened excessively, they may be damaged. Refer to the following table for tightening torques
of terminal screws:
Dimension of terminal screw
M3.5 (terminal block for communication line) 0.6~0.71
M4 (terminal block for power line)
M4 (terminal block for ground wire)
(7) DO NOT connect the power line connection to the communication terminal block because it will damage the circuit
control board.
(8) Wiring of communication lines shall be within the following scope. Exceeding the limit will possibly lead to abnormal
communication.
a) The maximum wiring length between the outdoor machine and the valve box, the valve box and the indoor machine,
and between valve box is 3280ft. at most. The total wiring length is 3280ft. at most.
b) The maximum wiring length between the valve box and the wire controller for switching working modes is
1640ft. at most.
Wiring Connection
Refer to the following figure – Diagram of electrical wiring of a connection kit – for wiring connection of connection kit.
31-5000593 Rev. 0
Tightening torque (in. lbs.)
0.87~1.06
1.12~1.37
Return Air
Liquid Tube
Vapor Tube
Sensor
Sensor
Sensor
The relay needs to
be disconnected if
it exceeds 3A
Note: Details for CN16, CN22 and CN23 are listed on next page.
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