Low Pressure Protection Control; Discharge Pipe Protection Control - Daikin VRV RXYMQ-A Series Service Manual

Protection Control
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 < 0.35 MPa
Heating
The following control is performed in the system.
Pe < 0.17 MPa
6.3

Discharge Pipe Protection Control

This discharge pipe protection control is used to protect the compressor internal temperature
against an error or transient increase of discharge pipe temperature.
temperature > 108°C
60
Normal control
Reduce compressor capacity step
Pe < 0.07 MPa
Low pressure standby
Normal operation
Reduce compressor capacity step
Pe < 0.07 MPa
Low pressure standby
Normal control
Discharge pipe
Reduce compressor capacity step
Discharge pipe temperature > 135°C
Discharge pipe temperature standby
Pe: Low pressure sensor detection
Pe > 0.40 MPa
When occurring 3 times within 60
minutes, the error code E4 is output.
Pe > 0.23 MPa
When occurring 3 times within 60
minutes, the error code E4 is output.
Discharge pipe
temperature < 95°C
SiME332106E
value for master unit.
When occurring 3 times within 100
minutes, the error code F3 is output.
(Sub code - 01)
Part 4 Functions and Control