Is the refrigerant gas or liquid

Is the refrigerant gas or liquid

Regarding whether the refrigerant is charged with gas or liquid, many masters must have known it for a long time. I often see people asking about this refrigerant when charging, whether it is gas or liquid? Here is a summary. For your reference.

　　1, three concepts

Single working fluid refrigerant, non-azeotropic mixed refrigerant and azeotropic refrigerant, single working fluid refrigerant: the refrigerant composition has only one working fluid; non-azeotropic refrigerant: two or more different refrigerants are mixed in a certain ratio The composition of the gas-liquid two-phase is different in the saturated state; azeotropic refrigerant: an azeotropic mixture formed by mixing two or more different refrigerants in a certain ratio. This type of refrigerant It can maintain a certain evaporation temperature under pressure, and its gas-liquid two-phase always keeps the composition ratio unchanged.

　　2, liquid or gas?

　　1) No matter whether the single working substance refrigerant is gaseous or liquid, its composition will not change, so it can be charged into gaseous state when charging refrigerant.

　　 2), although the composition of azeotropic refrigerant is different, but 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;

3) Due to the different boiling points of non-azeotropic refrigerants, the actual composition of liquid refrigerant and gaseous refrigerant is different. At this time, if gas is added, it will inevitably lead to different components of refrigerant added, such as only added A certain gaseous refrigerant, so only liquid can be added.

　　3, why can't all add liquid

Many friends who saw this, murmured in their hearts, since it is so difficult to distinguish, I don’t care what refrigerant is to add liquid to ensure that the composition is the same? Wrong, very wrong; we all know that in general, refrigerant charge Finally, it is necessary to add after the equipment is turned on, and add from the compressor suction port

　　 Go in; if you add liquid refrigerant, it is equivalent to the compressor suction port that enters the liquid refrigerant, which will obviously cause the compressor to strike and damage the compressor.

　 4. Summarize common refrigerant liquid or gas state

　　 Having said so much, many friends can't stand it. Here is a direct summary of whether common refrigerants are added in liquid or gaseous state, for your reference when repairing.

　　1), gas refrigerant: R13, R134a, R22, R23, R290, R32, R500, R600a

　　2), add liquid refrigerant: R401A, R410A, R410B, R407C, R404A;

　　 So many refrigerants, I believe my friends can't remember it clearly. One sentence tells you the secret: As long as the refrigerant at the beginning of R4 is added in liquid form, the rest is in gaseous form.