1, suction and exhaust pressure control: that is, we often say high and low pressure controller, by the high voltage control part and low voltage control part. If the exhaust pressure exceeds a given value, the high-voltage control compressor power cut, the compressor is stopped; the suction pressure is less than a given value, the low pressure control section cut off power supply to the compressor, shutdown, and sends out alarm signal.
2. Safety valve: in order to prevent leakage of refrigerant to the atmosphere, the general use of closed safety valve, the safety valve is set in the chiller, compressor, exhaust chamber and suction chamber between the pipeline.
3, safety film: safety diaphragm is arranged between the suction and discharge chamber, suction and discharge pressure exceeds the set value, the rupture of the diaphragm, the exhaust pressure is reduced (to be installed in the suction side of the cavity filter, to prevent broken diaphragm into the suction chamber).
4, the lubricating oil pressure difference controller: the hydraulic pump and hydraulic pump outlet respectively and the entrance, entrance pressure differential oil pressure controller on the high-pressure outlet connected between the hydraulic pump, when the entrance pressure is too high or too low, the controller will cut off the compressor power, the motor stops running, protect the compressor.