Low Pressure Protection Control - Daikin Super Multi Plus D-Series Service Manual

SiEBE18-526
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
Function
>
Pe 0.4MPa
Pe < 0.15MPa
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
SVP=OFF
Pe > 0.30MPa
SVP=ON
When occurring 3 times within 60 min.,
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"
Protection Control
is output.
(Q0376)
value
is output.
(V3176)
69