Protection Control ESIE09-08B
54 Function
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 heating operation [R-410A]
High-pressure drop
Pc>3.04MPaAfter 10 sec.
Pc>3.04MPa
Pc<2.94MPa
Pc>3.64MPa
Keeping the current step
After 60 sec.
High pressure not limited
High pressure limited
Pc: HP pressure sensor detection value
Pc<2.89MPa
INV upper limit frequency :
1-step down from current
compressor frequency
INV upper limit frequency :
1-step up from current
compressor frequency
High pressure
standby
When occurring 10 times within 60
minutes, HPS is activated without
high pressure standby, thus
outputting the malfunction code "E3".
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