Automatically shut down when the air conditioning and refrigeration is usually caused due to air conditioning overheating protection, overheating protection situation there are many, the main points of normal and non-normal, normal is when the air conditioning work in very harsh conditions, such as very high ambient temperature cooling, press load too much protection. Abnormal main system problems, such as lack of freon, and pipe blocked, the fan does not turn up, etc., to determine the specific circumstances. Automatically shut down when the air conditioning refrigeration mainly: 1, built-in air conditioning electrical parts protection. Mainly air motors and compressors. Typically built on top of the compressor, is recoverable. When the temperature is too high, when turned off, the temperature is normal after recovery. 2, on the protection of air-conditioning control, generally there are several: 1) current protection, air conditioning control panel has detected press Xuzhou current central air conditioning recovery, exceeds a set value protection. 2) pressure protection, a lot of air conditioning has low pressure switch over to protect the value of protection. 3) thermal protection, air generally has a temperature sensor to protect the compressor, compressor discharge temperature is generally detected or compressor top temperature. Over protection value protection. Air conditioning and heating in winter, the outdoor unit heat exchanger temperature is very low, it will have after the frost phenomenon met with ambient air, frosting is too thick, it will affect the efficiency of air conditioning Xuzhou central air conditioning installation, air conditioning and therefore automatically defrost deal with. Defrosting is actually a four-way switching valve, changing the direction of flow of freon (air conditioning cooling state but in the indoor unit fan is not working, otherwise blowing cold air), the outdoor unit heat exchanger heat to melt the frost off some time in 2- about 3 minutes. Winter air conditioning does not defrost reasons: 1, the ambient temperature is too low not defrost: Winter ambient temperature is too low, causing the air conditioning, then defrost difficult, due to outdoor temperatures below 0 degrees, the impact of air conditioning and heating effects. Outdoor temperature lower price Xuzhou central air conditioning parts, air conditioning central air conditioning and heating effects worse, that the actual heating capacity is not enough. 2, the air conditioning system is not enough to defrost heat: air conditioning and heating normal, but for an area smaller than the use of air conditioning and heating, air-conditioned room area, such as the machine with 50 (2), and using 35 machines (1.5), Of course, do not increase room temperature, ie rated heating capacity is not enough. There may not be open auxiliary heating, less a part of the heating capacity. 3, air filter is clogged: air conditioning and heating normal, but for a long time due to indoor air conditioner filter does not remove dust, resulting in clogged with dust filters, resulting in reducing the amount of circulating air. Thus heat causes blowing enough, can not defrost. 4, the system leads to lack of fluoride defrost heat is not enough, and thus can not defrost. 5, the control board failure, air conditioning did not defrost. 6, defrost temperature sensor failure, resulting in air conditioning is not defrost. Central air-conditioning duct cleaning process analysis machine into central air conditioning, hanging air conditioning, cassette air conditioner, cabinet air conditioners. These air conditioners, central air conditioning cleaning is the most difficult, is the highest natural clean-up costs. In it, the central air-conditioning duct machine, water machine. Duct cleaning machines are more expensive. 1, the return air filter cleaning disinfection 2, the air supply system disinfection. 3, fan coil cooler, washing, cleaning, sterilization central air conditioning with a special cleaning agent. Ventilate smooth 4, coil fan impeller, volute, sweeping the dust of the motor, the motor shaft refueling. 5, water butt plate, filter for removing sludge, debris, clean, maintain water flow 6, out of the wind gate clean. 7, check the plumbing connections are secure 8. Check the insulation is good 9, 10 check valve leaks, fan coil beneath fluorescent lights do not install central air conditioning maintenance of telephone facilities in Xuzhou _ _ Sheng Erda central air conditioning refrigeration by Xuzhou Sheng Erda Refrigeration Electrical Services Limited. Xuzhou 圣尔达 Refrigeration Electrical Services Limited (xzktw.com) strong, credible, in Xuzhou heat exchangers, refrigeration and air conditioning equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Sheng Erda refrigeration and you hand into the brilliant, for a better future!