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Daikin VRV III-S RXYMQ36 48PVJU Service Manual: Protection Control; High Pressure Protection Control

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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>503 psi
High pressure limited
[In heating operation]
Pc>441 psi
High pressure limited
42
High pressure not limited
INV. upper limit frequency=Max.
INV. upper limit frequency :
3-step down from current
After 10 sec.
Pc>503 psi
Keeping the current step
Pc<468 psi
After 15 sec.
INV. upper limit frequency :
1-step up from current
compressor frequency
Pc>528 psi
High-pressure
standby
High-pressure drop
High pressure not limited
Pc<419 psi
INV. upper limit frequency :
1-step down from current
After 10 sec.
Pc>441 psi
Keeping the current step
Pc<426 psi
After 60 sec.
INV. upper limit frequency :
1-step up from current
compressor frequency
Pc>528 psi
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 malfunction 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 malfunction code "E3".
SiUS34-907
Function

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