Daikin Super Multi Plus E-Series - Low Pressure Protection Control

Protection Control SiEN18-622
108 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
Pe<0.15MPa Pe>0.30MPa
Hot gas SVP = OFF
Hot gas SVP = ON
Pe: LP pressure sensor detection
value
Low pressure
limited
When occurring 3 times within 30 min., the
malfunction code "E4" is output.
&
• 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.
Pe<0.12MPa Pe>0.17MPa
Hot gas SVP = OFF
Hot gas SVP = ON
Low pressure
standby