Air conditioning refrigerant filling method

refrigerants to add is the most common question that all air conditioning repair is also a technical work together. Make sure to add refrigerant has excellent cooling effect, not only to choose quality ensure refrigerants, and pay attention to in the process of repair method and method.

1) Quantitative method: well matched in mouth of tee valve technology three-way valve, pressure gauge, hose, refrigerant cylinders, etc. After emptying refrigerants and pumping air into vacuum state, beginning gradually add refrigerant. More accurate measuring things weighing with the platform scale, a number of refrigerant in the refrigerant steel cylinder cut is air-conditioning brand of the specification and refrigeration dose, closed refrigerant cylinder valve.

2) Current measurement method: set the air conditioning in the cooling or heating high wind conditions ( Frequency conversion air conditioning set in operation condition) Homework, under low pressure cut-off valve technology mouth, add refrigerant while investigating clip-on ammeter change, when near extra homework calibration plate of current value, air conditioning refrigerant steel cylinder valve closed. At the moment, let air conditioning continue to work for a period of time, when the cooling conditions under room temperature approached 27 ℃ or room temperature under heating conditions near 20 ℃, and then thinking about outdoor air temperature, power grid voltage is concave and convex level affect the elements of current extra homework, fine-tuning together with the amount of refrigerant to arrive at current value extra homework, do add refrigerant accurately. Practice summary data of fine-tuning is: refrigeration condition, in outdoor air temperature 35 ℃ for specification, outdoor temperature every add or drop 1 ℃, add or reduce the extra homework current value of 1. 4%; Heating conditions, outdoor air temperature 7 ℃, for specification, outdoor temperature every add or drop 1 ℃, add or cut an additional 1% of the current value; Cooling or heating conditions, with additional power voltage 220 v or 380 v as the specification, the power supply voltage each drop 1 v, add or cut or add extra homework current value: single phase 1 0. 025年,1。 5 0. 025×1。 5, 2, 0. 025 a piece 0 x 2, 3. 025A×3; Three phase 3 0. 025 a (3/3, 5 0. 025 a piece 0 x 5/3 when, 10. 025A×10/3。

3) Pressure measurement method: put air conditioning refrigeration high wind conditions ( Winter, when the heating demand add refrigerant, set the air conditioning in the forced cooling conditions or placed at room temperature sensor in 27 ℃ warm water, at the mercy of imitation of summer temperature make the air conditioning refrigeration condition) Homework, under low pressure cut-off valve technology, add refrigerant and investigate the low pressure vacuum gauge, when low pressure at 0. 49MPa( In the summer) Or 0. 25MPa( Winter) , closed refrigerant cylinder valve. Rethinking the concave and convex air temperature, indoor outdoor cooling load low pressure influence elements such as intrusive, and fine-tune the amount of refrigerant Leon and the pressure on the table, be precise and refrigerant. Fine-tune factors because of the low pressure is proportional to the indoor cooling load, the cooling load, the greater the pressure is higher, whereas the lower; Add refrigerant technology and adjacent piping, because install outside, the pressure and the evaporation temperature is highly affected by the outside temperature, pressure and indoor heat exchanger practice transpiration are more high temperature in summer, winter, want a few lower.

4) Survey method: set the air conditioning in the cooling or heating high-speed wind conditions, add refrigeration dose accurately when the indoor heat exchanger into and out of 10 cm FengKouChu temperature difference is: when the refrigeration is greater than 12 ℃, greater than 16 ℃ when heating; Refrigeration, indoor heat exchanger, transpiration condensation all sound low, outdoor cut-off valve ChuJie condensation dripping dew, summer barrage, indoor heat exchanger with the capillary cohesion place frost-free dew, etc. ; When heating, the indoor heat exchanger wall temperature is greater than 40 ℃.

in the practice of repair, frequency conversion air conditioning as appropriate to add refrigeration dose accuracy requirement is high, or the air conditioning that decide frequency because of the vacuum cooling pipe system, appropriate chooses the quantitative add refrigerant. If the piping system need to compensate for refrigerants, appropriate chooses to measure current supplemented, gauge pressure, overall survey method.

1) Filling member put empty bottles in weighing instruments center, said the tare weight, tare weight and filling work number recorded in the packaging carton inside hand hole, filling fixture.

2) Open steel cylinder valves, pipes, vacuum valve, vacuum, vacuum pressure da 0. After 1 mpa, close vacuum valve.

3) Open pipe liquid filling valve, filling with close survey digital electronic weighing scale change and the presence of abnormal, reach rules, liquid valve closed pipe, steel cylinder valves.

4) Turn back valve, pipe back filling the material inside the hose, fixture after vacuum pressure gauge appeared to 0 mpa, recover the valve closed pipes.

5) Filling fixture to say, to the cylinder valve, funnelled check again and to recognize any leakage after valve sealing plastic membrane, neatly stacked to the rules of place, identity card and fill out the goods.

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