Daikin Super Multi Plus E-Series FFQ50B8V1B - Low Pressure Protection Control

SiBE18-821_C Protection Control
Function 89
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 < 0.25 MPa
36Hz Unload
Pe > 0.39 MPa
Pe
< 0.07 MPa
Low pressure not limited
Pe < 0.15 MPa Pe > 0.30 MPa
Hot gas bypass valve = OFF
Hot gas bypass valve = ON
(R12928)
Low pressure
limited
Pe: Low pressure sensor detection value
Low pressure
standby
When occurring 3 times within 30 min.,
the error code "E4" is output.
&
Ts – Teg
< 8 deg
Pe
> 0.06 MPa
Pe
> 0.09 MPa
or
After 10 sec.Pe
< 0.17 MPa
Pe
< 0.17 MPa
Pe
> 0.20 MPa
Pe < 0.07 MPa
Current step limited
After 15 sec.
Low pressure not limited
Low pressure limited
Pe < 0.12 MPa Pe > 0.17 MPa
Hot gas bypass valve = OFF
Hot gas bypass valve = ON
(R12929)
Upper limit frequency:
3-step down from current
compressor frequency
Upper limit frequency:
1-step up from current
compressor frequency
Low pressure
standby
When occurring 3 times within 30 min.,
the error code "E4"
is output.
Pe: Low pressure sensor detection value