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Check to see whether there is any refrigerant leakage, and check whether the power or transmission
cable is connected properly.
Confirm that 500 V megger shows 2.0 MΩ or more between power supply terminal block and
ground. Do not operate in the case of 2.0 MΩ or less.
NOTE: Never carry out mega ohm check over terminal control board.
Otherwise the control board may break.
Immediately after mounting the unit or after leaving it turned off for an extended length of
time, the resistance of the insulation between the power supply terminal board and the
ground may decrease to approx. 2.0 MΩ as a result of refrigerant accumulation in the inter-
nal compressor.
If the insulation resistance is less than 2.0 MΩ, turn on the main power supply.
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2
1. Check before Test Run
3. Test Run
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