Service manual

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Normal Operation
During the control of low pressure protection
Compressor step:
2-step down
After 10 sec.
After 10 sec.
After 15 sec.
After 15 sec.
Low pressure
standby
For single unit:
8 to 12HP: 52Hz+OFF
14 to 16HP: 52Hz+52Hz (upper limit)
For multi units:
When STD compressor is in
operation
One STD compressor stops
When STD compressor stays
stopped
52Hz+OFF+OFF (upper limit)
Current step
maintained
Upper limit compressor step:
2-step up
Upper limit compressor step:
1-step up
When occurring 4 times within 30 min.,
the malfunction code “E4” is output.
Pe_min>0.23MPa
Upper limit compressor step=max (Max. step)
Pe_min
<0.17MPa
Pe_min
>0.27MPa
Pe_min
<0.17MPa
Pe_min
<0.13MPa
Pe_min
>0.20MPa
Pe_min
<0.07MPa