Low Pressure Protection Control - Daikin Super Multi Plus E-Series FTXG25EV1BW Service Manual

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