Service manual

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When occurring 3 times within 30 min.,
the malfunction code “E4” is output.
Low pressure standby
INV upper limit frequency: 1-step /
20 sec up from current compressor
frequency
Low pressure limited
Low pressure not limited
Pe >0.25 MPa
INV upper limit frequency = 210 Hz
124 Hz + OFF + OFF
52 Hz + OFF + OFF
Pe: LP pressure sensor detection
value for each outdoor unit
Pe<0.16 MPa
Pe<0.16 MPa
Pe<0.13 MPa
Pe<0.07 MPa
Pe>0.19 MPa
When occurring 3 times within 30 min.,
the malfunction code “E4” is output.
Low pressure limited
Low pressure not limited
Pe: LP pressure sensor detection
value for master unit
Master unit: 52 Hz + OFF + OFF
Slave unit: Stop
All STD compressors
stop.
Low pressure standby
Pe<0.35MPa Pe>0.40MPa
Pe<0.25MPa
Pe<0.07MPa