Refrigerant circuit pressure sensors allow the controller to monitor compressor operation and protect the installation from abnormal conditions.
High pressure
The pressure on the discharge side is related to the condensation temperature and the system load.
Low pressure
The suction pressure provides information on the refrigerant evaporation and the operating status of the external or internal heat exchanger.
Role in protections
If pressures exceed the permissible limits, the controller can limit the output or stop the compressor.
Diagnosis
The readings should be compared with actual measurements and the manufacturer's service data.