SiE39-404 Protection Control
Function 95
4.2 Low Pressure Protection Control
This low pressure protection control is used to protect compressors against the transient
decrease of low pressure.
[In cooling operation]
H In the case of multi-outdoor-unit system, the entire system performs this control in the
following sequence.
[In heating operation]
H In the case of multi-outdoor-unit system, each outdoor unit performs this control
individually in the following sequence.
Low pressure not limited
Pe<0.35MPa
Low pressure standby
Low pressure limited
Pe<0.25MPa
Pe>0.40MPa
Pe<0.07MPa
All STD compressors
stop.
Master unit:52 Hz+OFF+OFF
Slave unit:Stop
When occurring 3 times within 30 min.,
the malfunction code “E4” is output.
Pe: LP pressure sensor detection
value for master unit
Pe<0.16 MPa
Pe<0.13 MPa
Pe<0.07 MPa
&
Low pressure not limited
Low pressure standby
Low pressure limited
124 Hz + OFF + OFF
52 Hz + OFF + OFF
Pe>0.19 MPa
Pe<0.16 MPa
When occurring 3 times within 30 min.,
the malfunction code “E4” is output.
Pe >0.25 MPa
INV upper limit frequency = 210 Hz
Pe: LP pressure sensor detection
value for each outdoor unit
INV upper limit frequency: 1-step /
20 sec up from current compressor
frequency
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