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The maximum wiring length between the outdoor machine and the furthest valve box or Cooling-only indoor unit
is 1000m,the valve box and the indoor machine is 90m. The maximum branch number is 16.
(6) Tighten terminal screws with proper screw driver. Screw driver of small dimension will damage the screw head
and fail to tighten properly.
(7) If terminal screws are tightened excessively, they may be damaged. Refer to the following table for tightening
torques of terminal screws:
(8) Power line is forbidden to the communication terminal block because it will damage the circuit control board.
(9) Wiring of communication lines shall be within the following scope. Exceeding the limit will possibly lead to
abnormal communication.
Dimension of terminal screw Tightening torque (N.m)
M3.5 (terminal block for communication line) 0.80~0.96
M4 (terminal block for power line) 1.18~1.44
M4 (terminal block for ground wire) 1.52~1.86
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