Protection Control; High Pressure Protection Control - Daikin VRVIII-S Service Manual

Vrv iii-s r-410a heat pump 50z
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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
52
High pressure not limited
INV upper limit frequency=Max
INV upper limit frequency :
3-step down from current
compressor frequency
Pc>3.47MPa
After 10 sec.
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
Pc>3.04MPa
After 10 sec.
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
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".
SiENBE34-703
Function

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