Common causes of damage to parallel compressors

Multi-compressor high temperature protection is mainly caused by the suction of the compressor, mainly for the following four reasons.
First, not enough refrigerant in the system. The top temperature of the refrigeration compressor and the discharge temperature are high, and the return pipe may have frost. Discharge pressure and return pressure are low and the current is low. Just need to add refrigerant;

Second, there is a blockage in the filter of the total return air pipe of the outdoor unit. Caused by the compressor top temperature is too high, and the exhaust temperature and basically no temperature and pressure, heating can not push the four-way valve reversal; gas, liquid pipe two shut-off valves at the pressure is basically the same; the total return pipe since the filter since all the frost. The solution is: if] dirty plug, then clean the total return air filter can be; if the ice plug, you need to use the filter to dry the water in the system;

Third, the refrigeration compressor back to the gas pipe filter mesh dirty blockage caused by the compressor top temperature is very high, but the exhaust pressure is 1 low, one or several compressors top temperature is also low. This is due to the compressor can not absorb the refrigerant, resulting in refrigerant bias flow to other compressors, thus causing other compressor suction is too large. The method of treatment is to remove the suction pipe of the faulty compressor and clean the suction filter.

Fourth, the refrigeration compressor return pipe filter ice blockage caused by the compressor’s top temperature is very high, but the exhaust pressure is low. One or more of the top temperature of the compressor is low, but after stopping and restarting, the moisture may be moved to another compressor return filter, thus causing the protection: the solution is: first pay attention to the system | system ice blockage, dirty blockage and oil blockage causes. The solution is as follows: First focus on the cause of the system ice blockage, dirty blockage and oil blockage. In the case of an ice jam, if the ice jam is only minor, simply clean the system with a filter drier; in the case of a more serious ice jam, it may be necessary to replace the lubricant and refrigerant in the system and blow the system dry with nitrogen;