83
C. Cooling operation conrmation
Whether the cold air is blown out
Whether air circulation is in good
condition
Whether the temperature
difference between return air and supply
air is proper (Note 1)
Whether the operating voltage is
proper (380 V ± 10%)
Whether operating pressure is
normal (Note 3)
Whether the operating current
is at ± 15% of the standard value (at
maximum frequency) (Note 2)
Set the operation to cooling mode and hold
down the operation switch for more than 5
seconds in shutdown mode.
Make all the indoor units operate
simultaneously
Normal
operation condition of the
compressor
rotation direction of the blade
Check and
the power supply
voltage and circuit
Check the temperature of indoor and outdoor;
Check pipe length and charging amount of the
refrigerant;
Check operating frequency of the compressor
and operating condition of the outdoor fan;
Check whether there is abnormal sound in the
compressor.
Start
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Check all indoor units one by one.
Once stop, the outdoor
unit can’t restart until 3
to 5 minutes later.
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