Protection Control
SiME332106E
60
Part 4 Functions and 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.
Heating
The following control is performed in the system.
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.
Normal control
Pe < 0.35 MPa
Low pressure standby
Reduce compressor capacity step
Pe < 0.07 MPa
Pe > 0.40 MPa
When occurring 3 times within 60
minutes, the error code
E4
is output.
Pe: Low pressure sensor detection
value for master unit.
Normal operation
Pe < 0.17 MPa
Low pressure standby
Reduce compressor capacity step
Pe < 0.07 MPa
Pe > 0.23 MPa
When occurring 3 times within 60
minutes, the error code
E4
is output.
Normal control
Discharge pipe temperature > 135°C
Discharge pipe
temperature < 95°C
Discharge pipe
temperature > 108°C
Reduce compressor capacity step
Discharge pipe temperature standby
When occurring 3 times within 100
minutes, the error code
F3
is output.
(Sub code - 01)
