Low Pressure Protection Control - Daikin RXYQ-TA Series Service Manual

SiUS341615E
6.2

Low Pressure Protection Control

This low pressure protection control is used to protect compressors against the transient decrease of low
pressure.
Cooling
Because of common low pressure, the following control is performed in the system.
Pe < 0.34 MPa
(49.8 psi)
Reduce compressor capacity step
Heating
The following control is performed in the system.
Pe < 0.17 MPa
(24.2 psi)
Reduce compressor capacity step
Functions and Control
Normal operation
Pe > 0.39 MPa
Pe < 0.07 MPa
(9.95 psi)
Low pressure standby
Normal operation
Pe > 0.23 MPa
(32.7 psi)
Pe < 0.07 MPa
(9.95 psi)
Low pressure standby
Pe: Low pressure sensor detection
value for master unit.
(56.9 psi)
When occurring 4 times within 60
minutes, the error code E4 is output.
When occurring 4 times within 60 minutes,
the error code E4 is output.
Protection Control
62