Causes and troubleshooting of industrial chillers

Causes and troubleshooting of industrial chillers

1. High condensing pressure (higher than the specified value) failure causes and remedies:

　　① Non-condensable gas in the system: release non-condensable gas.

　　②The chiller has insufficient cooling water and the water temperature is too high: check whether the water valve is open and the water filter is blocked, try to lower the water temperature.

　　③There is dirt in the condenser that affects the heat transfer area: clean the condenser.

　　④ Too much liquid in the condenser: release excess refrigerant.

　　 2. Compressor suction pressure is too low failure causes and remedies:

　　①Liquid throttle valve or suction filter is blocked: disassemble, inspect and clean.

　　② Insufficient refrigerant in the system: replenish refrigerant.

　　③ Insufficient refrigerant in the evaporator: open a large throttle valve.

　　④There is too much oil in the system: find the oil-collecting part of the system and release the oil.

　　3. The chiller compressor stops shortly after it starts. Causes and remedies:

　　①The oil pressure is too low: use the oil pressure regulating valve to increase the oil pressure. If it cannot be adjusted, check and repair it according to the serial number 6.

　　②The setting value of the oil pressure difference relay is too high: readjust.

　　4. Compressor discharge temperature relative to pressure drop and high temperature failure causes and remedies:

　　①The temperature of the inhaled gas is too high: Check and adjust according to the serial number 5.10.

　　②The exhaust valve is broken: Open the cylinder head to check the valve.

　　③Safety valve leakage: check the safety valve for adjustment and repair.

　　④ Piston ring leakage: check, repair or replace.

　　⑤ The gasket under the cylinder liner is broken and leaking: check and replace.

　　 5. The reasons and remedies for the compressor failure to start failure:

　　① Gas line failure: check and repair.

　　②The differential pressure relay is disconnected, and the high-voltage circuit breaker is disconnected: press the reset button of the differential pressure relay and wait for the pressure change to

　　 The contact is closed or readjust the disconnect pressure.

　　 6. Remedy for insufficient refrigeration capacity:

　　①The position of the spool valve is inappropriate or other failures: check the indicator and adjust the position to repair the spool valve.

　　②The suction filter is clogged, and the suction pressure loss is too large, which reduces the suction pressure and reduces the volumetric efficiency: remove the filter screen of the suction filter and clean it.

　　③ Abnormal wear and tear of the machine causes excessive gaps: adjust or replace parts.

　　④The suction pressure is lower than the evaporation pressure. Check the valve (such as suction stop valve or check valve, etc.)

　　⑤ Leakage between high and low pressure systems; check the bypass pipeline used for driving and stopping.

　　⑥Insufficient fuel injection, unable to achieve the sealing effect: check whether the safety valve is sealed, check the oil circuit, oil pump, oil filter, and increase the oil volume.

　　⑦The exhaust pressure of the machine is much higher than the condensing pressure, and the volumetric efficiency is reduced: check the exhaust system pipes and valves, and remove the resistance of the exhaust system. If air leaks into the system, it should be eliminated.

　　七. The compressor suction temperature is higher than the evaporation temperature (higher than the specified value). Causes and remedies:

　　① Insufficient refrigerant in the system: replenish refrigerant.

　　② Insufficient refrigerant in the evaporator: open a large throttle.

　　③The water content exceeds the regulation: check the water content.

　　④The low-pressure pipe insulation of the refrigeration system is not good: check and repair.

　　 8. Compressor unloading device mechanism failure causes and remedies:

　　①Insufficient oil pressure: Adjust the oil pressure to be 0.15-0.2Mpa higher than the suction pressure.

　　②The oil pipe is blocked: disassemble and clean.

　　③ There is dirt stuck in the cylinder: disassemble and clean.

　　 Nine. How to troubleshoot abnormal noise during machine operation:

　　①There are sundries in the rotor teeth: check the rotor and the suction filter.

　　②The thrust bearing is damaged: replace it.

　　③The friction between the rotor and the casing caused by bearing wear: replace the main bearing.

　　④Spool valve deflection: repair the spool valve guide block and guide post.

　　⑤ Loose joints of moving parts: Disassemble the machine for maintenance and strengthen anti-loosening measures.