Daikin ERQ, Service Manual

Page: 43 / 260

ESIE09-05 Protection Control
Function 33
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]
[In heating operation]
Pc>3.47MPa After 10 sec.
Pc>3.47MPa
Pc<3.23MPa
Pc>3.64MPa
Keeping the current step
After 15 sec.
High pressure not limited
High pressure limited
INV upper limit frequency :
1-step up from current
compressor frequency
Pc: HP pressure sensor detection value
INV upper limit frequency :
3-step down from current
compressor frequency
When occurring 10 times within 60
minutes, HPS is activated without high
pressure standby, thus outputting the
malfunction code "E3".
High pressure
standby
INV upper limit frequency=Max
High-pressure drop
Pc>3.04MPa After 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
INV upper limit frequency :
1-step up from current
compressor frequency
Pc: HP pressure sensor detection value
INV upper limit frequency :
1-step down from current
compressor frequency
When occurring 10 times within 60
minutes, HPS is activated without high
pressure standby, thus outputting the
malfunction code "E3".
High pressure
standby
Pc<2.89MPa
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