Low Pressure Protection Control - Daikin R-410A Service Manual

Protection Control
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]
Low pressure not limited
Pe < 0.25MPa
Low pressure
limited
Pe < 0.07MPa
[In heating operation]
• Pe>0.25MPa
• INV upper limit
&
frequency
Low pressure limited
Pe>0.19MPa(every 20 sec.)
SVP = OFF
52
Pe > 0.4MPa
52Hz
Low pressure
standby
Low pressure not limited
Pe<0.16MPa
Upper limit:
124Hz
Pe<0.13MPa
Upper limit:
52Hz
Pe>0.19MPa
Upper limit: 1-step up from
current compressor frequency
Pe>0.17MPa
Pe<0.10MPa
Pe
Low pressure
standby
Pe: LP pressure sensor detection
value
When occurring 3 times within 60 min.,
the the malfunction code "E4"
Pe: LP pressure sensor detection
More than 124Hz
&
Pe<0.16MPa
Pe<0.13MPa
SVP = ON
< 0.07MPa
When occurring 3 times within 60 min.,
the malfunction code "E4"
SiBE39-402A
is output.
(V3175)
value
is output.
(V3176)
Function