Daikin RWEYQ26PY1 [88/342] Low pressure protection control

Daikin RWEYQ30PY1 [88/342] Low pressure protection control
Si30-813 Protection Control
Function 77
6.2 Low Pressure Protection Control
This low pressure protection control is used to protect compressors against the transient
decrease of low pressure.
[In cooling operation]
[In heating or cooling/heating simultaneous operation] (When the outside unit heat
exchanger is used as evaporator.)
Normal operation
Low pressure standby
Pe < 0.07 MPa
When occurring 4 times within 60 min.,
the malfunction code E4 is output.
Pe < 0.34 MPa
Pe < 0.24 MPa
Pe > 0.39 MPa
1 Pe: LP pressure sensor detection
value for master unit
2 This frequency control is carried
out in whole system.
Less than 3 times
within 60 min.
Pe > 0.34 MPa
Pe
<
0.24 MPa
Compressor 52Hz
Hot gas solenoid valve (Y1S)
ON
Hot gas solenoid valve (Y1S)
OFF
Normal control
Low pressure standby
Pe < 0.07 MPa
When occurring 4 times within 60 min.,
the malfunction code “E4” is output.
Pe < 0.63 MPa
Pe < 0.55 MPa
Pe
> 0.71
MPa
Pe > 0.68 MPa
Pe
<
0.63 MPa
Comp. upper limit up
1 step/20 sec.
Comp. upper limit down
1 step/10 sec.
Compressor 52Hz
1 Pe: LP pressure sensor detection
value for each outside unit.
2 This frequency control is carried
out in each outside unit.
Less than 3 times
within 60 min.

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