Protection Control; High Pressure Protection Control - Daikin REYQ72 Serveice Manual

SiUS39-602
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>505 psi
INV upper limit frequency :
3-step / 10 sec down from
current compressor frequency
Pc>505 psi
Pc>512 psi
STD compressor
standby for 5 mins
[In heating operation]
Pc>490 psi
Lower-priority compressor stops.
Pc>490 psi
Pc>506 psi
Function
High pressure not limited
INV upper limit frequency = 210 Hz
High pressure limited
Pc>519 psi
High pressure standby
High pressure not limited
Pc<435 psi
High pressure limited
Pc>519 psi
52 Hz + OFF
High pressure standby
Pc: HP pressure sensor detection
value for each outdoor unit
Pc<464 psi
INV upper limit frequency:
1-step / 20 sec up from
current compressor frequency
When occurring 3 times within
30 min., HPS is activated without high
pressure standby, thus outputting the
malfunction code "E3" .
Pc: HP pressure sensor detection
value for master unit
When occurring 3 times within
30 min., HPS is activated without high
pressure standby, thus outputting the
malfunction code "E3" .

Protection Control

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