Daikin ERQ - Low Pressure Protection Control

Protection Control ESIE09-05
34 Function
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]
[In heating operation]
Pe<0.25MPa
36Hz Unload
Pe>0.39MPa
Pe < 0.07MPa
Low pressure not limited
Low pressure
standby
Low pressure
limited
Pe: LP pressure sensor detection
value
When occurring 3 times within 30 min.,
the malfunction code "E4" is output.
Pe<0.15MPa Pe>0.30MPa
Hot gas SVP = OFF
Hot gas SVP = ON
&
• Ts-Teg < 8deg
• Pe > 0.06MPa
• Pe > 0.09MPa
or
After 10 sec.Pe
< 0.17MPa
Pe
< 0.17MPa
Pe
> 0.20MPa
Pe< 0.07MPa
Current step limited
After 15 sec.
Low pressure not limited
Low pressure limited
INV upper limit frequency :
1-step up from current
compressor frequency
Pe: LP pressure sensor detection
value
INV upper limit frequency :
3-step down from current
compressor frequency
When occurring 3 times within 30 min.,
the malfunction code "E4" is output.
Low pressure
standby
Pe<0.12MPa Pe>0.17MPa
Hot gas SVP = OFF
Hot gas SVP = ON
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