Refrigerant filling operation steps

a, instrument calibration: 1, 2, 3 N2 cylinders, manifold pressure gauge vacuum pump 4, refrigerant tank 2, suppression of leak detection: 1, with the two ends of the pressure hose connecting separation in liquid nitrogen inflator hand valve and valve repair and mouth; 2, opened the nitrogen cylinder valve and pressure reducing valve ( Relief pressure of 0. 8 to 1. 0MPa） , and then opened the nitrogen inflator hand valves and manifold pressure gauge high side manual valve, namely beginning nitrogen inflator repression; 3, repression and a closed manifold pressure gauge high side manual valve, filling nitrogen hand valve and nitrogen bottles of the valve; 4, with soap and water to see the land, Mainly in the loop each tube interface and welding joints) With or without leakage; 5, no leakage of nitrogen gas emptying. Three, vacuum system: 1, use the hose will be manifold pressure gauge high side with vacuum pump valve in hand; 2, open hand vacuum pump valve, manifold pressure meter high side manual valve, and open the vacuum pump, press the button start vacuum homework; 3, vacuum continuous time should be at least 1 h, continuous time is longer for good, for - vacuum degree requirements 0. 1MPa； 4, vacuum, vacuum pump, closed, unload the manifold pressure gauge high side pressure hose. Four, filling refrigerant R22:1, the low voltage side of the manifold pressure gauge with pressure hose with refrigerant tank cohesion; 2, hose air emptying of priority at the moment, attach a hose and manifold pressure gauge at low voltage side connecting loosen, and opened the refrigerant tank valve, at the moment in the hose and manifold pressure gauge at low voltage side connecting loosen place heard the hiss, when see a white gas, refrigerant tank valve closed at the moment, this moment using refrigerant will tube air emptying; 3, because after vacuum system is a vacuum, only need to increase the low voltage side of manifold pressure gauge at the moment the manual valve opening, refrigerant pressure itself into the system until the low voltage table filling pressure reaches 0. 5 mpa; 4, still lack of refrigerant in the system, demand for filling, now open cooling system, using high pressure compressor, refrigerant filling, ongoing until the low pressure table filling pressure reaches 0. 1 to 0. 2 mpa; 5, after filling, closed manifold pressure gauge manual valve, refrigerant cans on the low voltage side of the valve; 6, filling refrigeration dose of discrimination: (1) on the basis of the evaporator outlet temperature requirements, collect corresponding refrigerant corresponding saturation pressure value, according to the low pressure table for refrigeration dose; (2) handle method: according to the evaporator outlet temperature and the compressor outlet pipe two, when the temperature of the compressor outlet pipe is slightly higher than the outlet temperature of the evaporator, About 7 ℃) Can; Evaporator inlet pipe, mutatis mutandis, the temperature and the temperature of the evaporator outlet pipe, the two there is a big difference in temperature, inlet pipe below the outlet pipe temperature, condensation and running for a period of time imported tube. Five, the unloading pressure hose, each instrument thing right.

in order to prevent accidents, filling refrigerant when had better look for professional personnel to operate!

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