High and low pressure pressure switches are electromechanical devices used to monitor high and low side pressures in refrigeration systems.
The low pressure switch is generally used with a pressure take-off in the suction of the machine and must shut down the machine if this pressure is too low for proper operation of the compressor, it is necessary to restart the compressor only after the suction pressure reaches a value sufficient for normal operation, without the occurrence of continuous activation and shutdown, an effect we call "cycling".
The high pressure switch operates with a logic that is the reverse of the low pressure, since the compressor must shut off if the discharge pressure is too high and can cause overheating of the housing and subsequent carbonization of the compressor oil.
