Because it's the only way to recover it. You recover from the high pressure side, and charge it on the low pressure side.
The last thing you want to do is tap into a closed system, this is the beginning of the end in most cases. If a unit is damaged, the refrigerant will be gone anyways. A refrigerator holds 4 oz. to 5 oz. refrigerant, it takes a tiny leak to deplete it entirely. Should you need to pump a system down then you can install a tap temporarily and sil floss in a proper suction line access, the high side is optional.
There isn't an "AC drain line". Refrigerant is recovered through the schrader valve on the high pressure side. Servicing an AC system is not a "do-it-yourself" task, especially when it comes to recovering, handling, and storing refrigerant.
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You cool it and run it through a metering devise.
what happens when refrigerant enters the condenser
The refrigerant pressures are dependent on the type of refrigerant.
A refrigerant transfer tank, often referred to as a "refrigerant recovery tank" or "refrigerant cylinder," is used for the safe transfer and storage of refrigerants during servicing or recovery processes. These tanks are designed to handle high pressure and are typically made of robust materials to prevent leakage. They are equipped with safety features, such as pressure relief valves, to ensure safe operation. Proper labeling and adherence to regulations are essential when using these tanks to manage refrigerants responsibly.
One possibility is excessive refrigerant in the system.
When the refrigerant leaves the compressor, it is in a high-pressure gas state. It then flows through the condenser coils, where it releases heat and condenses into a high-pressure liquid before entering the expansion valve.
No , a high temperature high pressure ( gas )
Pneumatic valves are used to close valves in high-speed internal combustion engines, pneumatic valves are mostly to help racing engines to get to high speeds.
It passes heat out of the high pressure high temp vaporized refrigerant so the it becomes a high pressure lower temperature liquid.It passes heat out of the high pressure high temp vaporized refrigerant so the it becomes a high pressure lower temperature liquid.