How to judge the new and old refrigeration compressors

How to judge the new and old refrigeration compressors

After we buy the chiller, how to judge the old and new problems of the compressor? This requires the accumulation of professional knowledge. Therefore, in view of this, users should master some knowledge about industrial chillers. People in the industry know that the heart of industrial chillers is the refrigeration compressor. It can be seen that the compressor occupies a very important position in the chiller.

　　Take two or more identical chillers as an example. Please use a meter to measure the winding resistance of the compressor. If it is a new machine, the winding resistance must be the same. If you only buy a chiller, please check if the peculiar smell of the machine is strong when you test the pressure or use an open flame to test whether the exhaust port is discolored (the lighter's fire should be yellow). The discoloration indicates that it has been used and has been charged. Fluorine, even if it has been cleaned with gasoline, it will not clean the used traces.

The production cost of the original refrigerator machine cannot be compared with the second-hand goods, refurbished machines, and offline machines on the market. In the operation of refrigeration maintenance, it is basically electricians and mechanics. There are many people with insufficient experience and technology among these personnel. Few of them are really certified personnel, and even those with certificates are not all personnel with maintenance experience. The refrigeration system z* basically analyzes the following 4 items, one of which is indispensable: operating current, high and low pressure (compression ratio), cooling coal charge, compressor superheat. Excessive deviation of one item will cause compressor loss. If you use a brand new machine from the original factory, the operation can achieve the above points, and it will surely guarantee your machine's normal use for several years. With an understanding of product knowledge, coupled with choosing a reputable company, I believe that in this case, you will not buy a shoddy chiller.

　　Thermistor is embedded in the motor winding of water-cooled chiller, the resistance is usually 1kΩ. When the winding is overheated, the resistance value will increase rapidly. Once it reaches or exceeds 141kΩ, the thermal maintenance module SSM will act to cut off the operation of the unit, and the overheating fault will be displayed together, and the TH fault indicator will be on. If the unit electronic board is faulty or communication fault, it can also falsely report the overheat fault. The overheating maintenance module SSM is damp or damaged, the intermediate relay is damaged, and the contacts are bad. The performance is an overheating problem when starting up, and the compressor cannot start.

　　 The compressor load is too large and the compressor is running with overcurrent. The cooling water temperature of the chiller is too high, the refrigerant is charged too much, or there are non-condensed gases such as air in the refrigeration system, resulting in a heavy load on the compressor of the chiller, which is manifested as overcurrent and accompanied by high pressure problems. Compressor overcurrent operation caused by electrical fault. If the communication contactor is damaged, the contact is ablated, causing excessive contact current or excessive current due to lack of phase.