The refrigeration compressor of the air-cooled chiller cannot be started. What aspects should be checked?

1. Check the main circuit first. For example, whether the power supply has electricity, whether the voltage is normal, whether the fuse has been blown due to starting overload, whether the air switch is tripped, whether the switch contacts are good, and whether the power supply lacks phase. Observe the voltmeter and ammeter when starting. When the chiller is not equipped with an ammeter or voltmeter, you can use a multimeter or a tester to check the power supply. When the power supply voltage is too low, the compressor will not start.

2. For the piston refrigeration compressor, whether the big end bearing bush and the curved sleeve of the connecting rod are caught in the shaft. These can be caused by the excessively high exhaust temperature during the previous operation, or it can be caused by the coking of the lubricating oil, which makes the cylinder and the piston stick together, making the compressor unable to start.

3. Check the differential pressure relay and high and low voltage relay. When the oil pressure of the compressor is abnormal (exceeding a certain value or lower than 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 of them can be started or the compressor will stop running soon after it has been started.

4. 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 protection facilities, the unit often shuts down quickly.

5. Check whether the relevant solenoid valves and regulating valves are malfunctioning, and whether they are opened or closed as required.

6. Check whether there is any leakage of working fluid or incorrect adjustment in the temperature sensing bulb of the temperature relay.