Two changes of state of the refrigerant are necessary to operate a refrigerator because it allows the refrigerant to absorb heat inside the refrigerator as a liquid and release heat outside the refrigerator as a gas, thus facilitating the cooling process efficiently. The changes in state from liquid to gas and gas to liquid help maintain the desired temperature inside the refrigerator.
The two changes of state of the refrigerant necessary to operate the refrigerator are vaporization (absorbs heat from the refrigerator to cool it down) and condensation (releases heat to the surrounding environment to maintain cooling). These processes occur in the evaporator and condenser coils within the refrigeration system.
To charge a walk-in cooler with R404a refrigerant, you will need to connect a refrigerant cylinder to the system using a manifold gauge set. Open the cylinder valve and slowly add the necessary amount of refrigerant into the system according to the manufacturer's specifications. Be sure to monitor the system pressures and temperatures as you charge it to ensure that it is properly charged.
Refrigerators release heat as part of the cooling process when they remove heat from inside the unit. The heat is generated by the compressor and condenser coils as they work to circulate refrigerant and maintain the cold temperature inside. It is a normal and necessary function for the refrigerator to operate efficiently.
Refrigerant pressure decreases in a refrigerant cylinder while charging with vapor because vapor has a lower density compared to liquid refrigerant. As vapor is introduced into the cylinder, it displaces the liquid refrigerant, causing the pressure to drop as the overall density of the refrigerant in the cylinder decreases.
You would have to recover the refrigerant and weigh it.
0Psia
This is most definitely not a DIY task. To do it properly, you need to first test the purity of the refrigerant, which takes special equipment to do, as does actual recovery and storage of the refrigerant.
Use a vacuum pump that pulls it into a tank.
Take it to a shop that does ac work and have them recover, evacuate and recharge the system but the question I have is why do you want to change the refrigerant?
The type of refrigerant that an E 34 needs is R12 refrigerant. It is absolutely necessary that you do not put any other type of refrigerant into a R12.
The process that requires you to recover refrigerant from a system and store it in an external container is Recovery. This involves removing the refrigerant from the system and transferring it to a separate container for proper handling and disposal.
You have it done by an ASE certified tech in an EPA certified shop which has the equipment necessary to recover, store, and recycle refrigerant. Releasing it into the atmosphere is prohibited by federal law.
The only legal and safe way to do it is to have a shop recover the refrigerant with an RRR (Recover, Recycle, Recharge) machine. Try your local community college if they offer a vocational program for mechanics... they might even pay you for the refrigerant they recover.
You recover the refrigerant with an AC recovery/recycle machine.
The EPA.
In order to make it easier to recover refrigerant.