Cause Analysis of Refrigeration Compressor Cannot Start or Stop Quickly After Start

Cause Analysis of Refrigeration Compressor Cannot Start or Stop Quickly After Start
1) First check the main circuit. Whether the power supply has power, whether the voltage is normal, whether the fuse has been blown due to starting overload, whether the air switch has tripped, whether the switch contacts are good, and whether the power supply is missing phase. Observe the voltmeter and ammeter when starting. When the small-scale refrigeration and air-conditioning equipment does not have an ammeter or electric meter, a multimeter or electric pen can be used to check the power supply. When the power supply voltage is too low, the compressor will not start.

2) Check the differential pressure relay phase high and low voltage relay. When the compressor oil pressure is abnormal (beyond a certain value or below a certain value), the compressor can be stopped. At the same time, when the compressor discharge pressure (high pressure) and suction pressure (low pressure) are abnormal, neither can be started or the compressor will stop running soon after it has been started.

3) Check whether the amount of chilled water, cooling water and water temperature are normal. If the water volume is small and the water temperature is high, it will cause the condensing pressure to rise sharply and the evaporation temperature to drop rapidly. Due to the action of the unit's protection facilities, it often shuts down quickly.

4) The working fluid in the temperature sensing bag of the temperature relay is leaking, or the adjustment is incorrect.

5) For the piston refrigeration compressor, whether the connecting rod big-end bearing bush and the curved sleeve are locked. These may be caused by the exhaust gas temperature being too high during the previous operation, or it may be caused by the coking of the lubricating oil, which causes the cylinder to stick to the piston and prevent the compressor from starting.

6) Check whether the related solenoid valves and regulating valves are malfunctioning and whether they are opened or closed as required.

The above reasons often cause the refrigeration compressor to fail to start, or start for a few minutes, or stop quickly after more than ten minutes. The cause must be carefully searched. Before the cause is found, it cannot be forcibly started to avoid damage to the equipment.

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