Air Conditioning Troubleshooting: one, an air conditioner leakage, air conditioner live shell; 2, the power cord insulation and metal collide and destroy it live; 3, induction charging. Second, the air conditioner is not cooling (hot) 1, Freon (commonly known as refrigerant) is not enough; 2, power supply voltage is not enough; 3, air power is not enough so that no cooling (heating); 4, the ambient temperature is too high resulting in air conditioning refrigeration (hot); 5, long time without air conditioning, cleaning and maintenance; brass long 6, outdoor unit and indoor machines. Third, an air leakage, newly installed air conditioning extended drain leakage; 2, there is no long-term cleaning and maintenance caused by air leakage; 3, air conditioning lack of fluoride cause air leakage What is a three-phase three-wire power supply what is the three-phase four-wire power supply.? ? three-phase three-wire system is a three-phase AC power connection Xuzhou central air conditioning maintenance, from the end of the three coils of wire leads to three, and the other end of the coil will be three together, also known as the central star connection Xuzhou air conditioning repair parts, common symbols "Y" means Xuzhou central air conditioning recovery, which leads to three wire power mode called the three-phase three-wire system. If further from the junction of three coils and then leads a trailing wire, which leads to four wire power supply called phase four-wire mode. What is the phase line (or FireWire)? What is the middle (or neutral)? 3 end of the connection point is called the midpoint of the wire leads from the point called the center line or zero line. From 3 ends with wire leads or line call. Xuzhou central air conditioning installation | Sheng Erda refrigeration (certified) | central air conditioning provided by Xuzhou 圣尔达 Refrigeration Electrical Services Limited. Xuzhou Sheng Erda Refrigeration Electrical Services Limited (xzktw.com) Xuzhou, Jiangsu, heat, refrigeration and air conditioning equipment leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customers needs. Sheng Erda leader in refrigeration staff warmly welcome all inquiries negotiations to create a better future Sheng Erda refrigeration.