Protection Control ESIE11-05
54 Functional Description
4.2 Low Pressure Protection Control
This low pressure protection control is used to protect compressors against the transient
decrease of low pressure.
In the case of multi-outdoor-unit system, each outdoor unit performs this control individually in
the following sequence.
Pe<0.13 MPa
Pe >0.23 MPa
INV upper limit Hz = MAX
Pe<0.07 MPa
&
Low pressure not limited
Low pressure standby
Low pressure limited
INV upper limit frequency:
up from current compressor
frequency
52 Hz + OFF + OFF
Pe: LP pressure sensor detection
value for each outdoor unit
Pe<0.17 MPa
When occurring 4 times within 30 min.,
the malfunction code “E4” is output.
Unload inverter
Time laps
Time laps
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