Protection Control; High Pressure Protection Control - Panasonic U-4..6ML5XPQ 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>3.47MPa
High pressure limited
[In heating operation]
Pc>3.04MPa
High pressure limited
60
High pressure not limited
INV upper limit frequency=Max
INV upper limit frequency :
3-step down from current
compressor frequency
After 10 sec. Pc>3.47MPa
Keeping the current step
Pc<3.23MPa After 15 sec.
INV upper limit frequency :
1-step up from current
compressor frequency
Pc>3.64MPa
High pressure
standby
High-pressure drop
High pressure not limited
Pc<2.89MPa
INV upper limit frequency :
1-step down from current
compressor frequency
After 10 sec. Pc>3.04MPa
Keeping the current step
Pc<2.94MPa After 60 sec.
INV upper limit frequency :
1-step up from current
compressor frequency
Pc>3.64MPa
High pressure
standby
Urban Multi ML5 · Mini UM · Heat Pump
Pc: HP pressure sensor detection value
When occurring 10 times within 60
minutes, HPS is activated without high
pressure standby, thus outputting the
malfunction code "E3".
Pc: HP pressure sensor detection value
When occurring 10 times within 60
minutes, HPS is activated without high
pressure standby, thus outputting the
malfunction code "E3".
Function