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

Protection Control

4. Protection Control

4.1

High Pressure Protection Control

This high pressure protection control is used to prevent the activation of protection devices due
to abnormal increase of high pressure and to protect compressors against the transient
increase of high pressure.
[In cooling operation]
Pc > 3.47 MPa
High pressure limited
[In heating operation]
Pc > 3.04 MPa
High pressure limited
88
High pressure not limited
Upper limit frequency = Max
Upper limit frequency:
3-step down from current
compressor frequency
After 10 sec. Pc > 3.47 MPa
Keeping the current step
Pc < 3.23 MPa After 15 sec.
Upper limit frequency:
1-step up from current
compressor frequency
Pc > 3.64 MPa
High pressure
standby
High pressure drop
High pressure not limited
Pc < 2.89 MPa
Upper limit frequency:
1-step down from current
compressor frequency
After 10 sec. Pc > 3.04 MPa
Keeping the current step
Pc < 2.94 MPa After 60 sec.
Upper limit frequency:
1-step up from current
compressor frequency
Pc > 3.64 MPa
High pressure
standby
Pc: High pressure sensor detection value
When occurring 10 times within 60 minutes,
high pressure switch is activated without
high pressure standby, thus outputting the
error code "E3".
Pc: High pressure sensor detection value
When occurring 10 times within 60 minutes,
high pressure switch is activated without
high pressure standby, thus outputting the
error code "E3".
SiBE18-821_C
(R12926)
(R12927)
Function