1. Key points for debugging the electrical system
Power supply parameter inspection: First, ensure that the power supply voltage is stable and within the allowable range of the rated voltage of the industrial chiller. The allowable fluctuation range is usually ±10% of the rated voltage. Voltage that is too high or too low may affect the life of electrical components and the normal startup and operation of the compressor. At the same time, check whether the phase sequence of the power supply is correct. Especially for compressors with three-phase motors, the wrong phase sequence may cause the motor to reverse and cause equipment damage.
Control circuit test: Perform a comprehensive test on the control circuit of the industrial chiller, including various control switches, contactors, relays, temperature sensors, and pressure sensors. Check whether the wiring of the control circuit is firm and whether there is a short circuit or open circuit. By simulating various operating states, such as starting, stopping, temperature and pressure changes, observe whether the control circuit can respond accurately and whether each electrical component operates according to the predetermined program.
2. Key points for debugging the water system
Water flow inspection: The water flow of the water system directly affects the cooling effect of the industrial chiller. During debugging, ensure that the flow of chilled water and cooling water is stable and sufficient. The water flow is detected by the water flow switch or flow meter installed on the pipeline. The flow of chilled water and cooling water should meet the design requirements of the equipment. If the water flow is insufficient, it may be caused by pipeline blockage, water pump failure or valve not fully opened, which needs to be checked and resolved in time.
Water quality and water temperature monitoring: Check whether the water quality meets the requirements. Impurities, minerals and microorganisms in the water may scale or breed algae in the pipeline and heat exchanger, affecting the heat exchange efficiency. At the same time, the inlet temperature of the cooling water should be monitored, because too high inlet temperature will cause the condensing pressure to rise, reduce the refrigeration efficiency, and affect the performance of the industrial chiller.
3. Key points for refrigerant system commissioning
Refrigerant charge check: The refrigerant charge has an important impact on the refrigeration capacity and operating stability of the industrial chiller. During the commissioning process, it is necessary to observe the corresponding relationship between the refrigerant pressure and temperature, and combine it with the rated charge of the equipment to determine whether the refrigerant is sufficient. If the refrigerant is insufficient, the cooling capacity will decrease, and the compressor may start and stop frequently due to low suction pressure; if the refrigerant is excessive, the condensing pressure may be too high.
Refrigeration cycle test: After starting the industrial chiller, monitor the state changes of the refrigerant throughout the refrigeration cycle. Observe the parameters such as the suction pressure, exhaust pressure, suction temperature and exhaust temperature of the compressor to ensure that they are within the normal operating range. Under normal circumstances, the suction pressure should correspond to the evaporation temperature, and the exhaust pressure should correspond to the condensing temperature. Abnormal changes in these parameters may indicate that there are problems such as leakage, blockage or compressor failure in the refrigeration system.
4. Key points for debugging safety protection devices
Overload protection test: Test the overload protection device of the industrial chiller. By simulating overload conditions, such as increasing the load of the compressor or making the motor current exceed the rated value, check whether the overload protection device can cut off the power supply in time to protect the equipment from damage.
High and low pressure protection test: High and low pressure protection devices are essential to maintain the stable operation of the refrigeration system. During debugging, it is necessary to simulate abnormal high and low pressure conditions to check whether the protection device can operate accurately, so that the industrial chiller can be shut down in time when the pressure exceeds the normal range, avoiding damage to the compressor and other components due to excessively high or low pressure. At the same time, after the protection device is activated, it is necessary to check whether the equipment can automatically reset and resume normal operation after the fault is eliminated.
