Low Pressure Protection Control - Daikin RXSQ24TAVJU Service Manual

SiUS331708EA
4.2

Low Pressure Protection Control

This low pressure protection control is used to protect compressors against transient decreases in low pressure.
Cooling operation
Low pressure not limited
Pe < 0.34 MPa
(49.3 psi)
Low pressure
limited
Pe < 0.07 MPa
Heating operation
Pe < 0.15 MPa (21.3 psi)
Low pressure limited
Pe < 0.15 MPa (21.3 psi)
Pe > 0.19 MPa (27 psi)
Functions and Control
Pe > 0.39 MPa
(56.6 psi)
Current step
limited
Pe < 0.34 MPa (49.3 psi)
Lower step
(10.2 psi)
Low pressure
standby
Low pressure not limited
Pe > 0.25 MPa (35.6 psi)
Compressor upper limit
frequency: 6-step down from
current compressor frequency
After 10 seconds
Current step limited
After 10 seconds
Compressor upper limit
frequency: 1-step up from
current compressor frequency
Pe < 0.07 MPa (10.2 psi)
Low pressure
standby
Pe: Low pressure sensor detection value
Hot gas bypass valve: OFF
Pe < 0.15 MPa
(21.8 psi)
Hot gas bypass valve: ON
When occurring 3 times within 60 minutes,
the error code E4 is output.
Pe: Low pressure sensor detection value
Pe < 0.13 MPa (19 psi)
Lower step limit
After 10 seconds
When occurring 3 times within 60 minutes,
the error code E4 is output.
Protection Control
Pe > 0.30 MPa
(43.5 psi)
Hot gas bypass valve: OFF
Pe < 0.10 MPa Pe > 0.17 MPa
(14.2 psi)
Hot gas bypass valve: ON
(24.7 psi)
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