Why should the refrigerant be filled in liquid form? Wh […]
Why should the refrigerant be filled in liquid form? What are the best methods of filling?
Refrigerants can be divided into three categories: single working fluid refrigerants, non-azeotropic mixed refrigerants, and azeotropic mixed refrigerants.
Regardless of whether the single-working-substance refrigerant is gas or liquid, its composition will not change, so gas can be charged when charging refrigerant.
Although the composition of the azeotropic refrigerant is different, because the boiling point is the same, the composition of the gas and liquid is also the same, so it can be filled with gas;
Non-azeotropic refrigerants have different boiling points, so liquid refrigerants and gaseous refrigerants are actually different in composition. If gas is added at this time, it will inevitably lead to different refrigerant components, such as only a certain gaseous state. Refrigerant, so only liquid can be added.
In other words, non-azeotropic refrigerants must be added with liquid, and non-azeotropic refrigerants start with R4. This type of liquid must be added. Common non-azeotropic refrigerants are: R40, R401A, R403B, R404A, R406A , R407A, R407B, R407C, R408A, R409A, R410A, R41A.
As for other common refrigerants, such as: R134a, R22, R23, R290, R32, R500, R600a, no matter how to add gas or liquid, it will not affect the composition of the refrigerant, so how convenient is it to come.
Common methods and drawbacks of refrigerant charging
1. Observe the bubbles in the sight glass;
2. Measure high and low pressure;
3. Measure the compressor current;
4. Weigh the weight punch.