Firstly, we need to confirm whether the compressor load has been burned or the components have worn out. If so, it will inevitably contaminate the refrigerant system, such as residual refrigerant oil remaining in the pipeline after carbonization, and the drying filter absorbing a large amount of water. So, if a compressor burns out, the first thing we need to analyze is whether it is due to temperature control quality issues such as contactors and overload devices inside the control box; Whether it is a set value change or adjustment error; Is it due to unstable power supply voltage; Whether the operator operates in the normal order, etc.
Screw chillers are mainly used in industries such as chemical, ink printing, large-scale energy equipment, mixing plants, food preservation, central air conditioning, etc. According to different heat dissipation methods, there are air-cooled screw chillers and water-cooled screw chillers. The compressor of screw chillers usually uses imported compressors from Taiwan's Hanzhong or Germany's Bitzer brand. These compressors use 5:6 ultra efficient spiral rotor technology, which is 20-30% more energy-efficient than general compressors. However, even the best product cannot be used continuously. It also has a limited lifespan and may cause malfunctions due to improper operation. So, how should we deal with problems when the screw chiller compressor is damaged?
If it has been determined that the compressor is damaged and completely unusable, we should replace it with a new compressor according to the following steps:
1. Remove the dry filter and use a temporary detachable connector or copper pipe joint to catch the short circuited part;
2. Inject cleaning agent into the pipeline system to clean the circulating flow. If necessary, replace the cleaning agent for multiple cleaning cycles;
3. Blow dry the entire system using nitrogen gas at a pressure of 10kg/cm2 until there is no residual cleaning agent;
4. Install the compressor and dry filter, and use nitrogen gas with a pressure of 10kg/cm2 to detect leaks. If there is no leakage, the remaining nitrogen gas can be discharged into the atmosphere through the high-pressure end angle valve;
5. Simultaneously evacuate from the high and low voltage ends to 1000micro, and then check all power and electrical control systems;
6. Add liquid refrigerant and start the machine for testing after reaching 80% to 90% refrigerant volume. Note: The compressor needs to be heated for 2 hours.
7. Replace the compressor refrigeration oil and observe the oil usage during compressor operation.