How to Add Refrigeration Oil to the Compressor?

[DelAngela]

Here are the methods for adding refrigeration oil to the compressor: 1. Method for changing refrigeration oil in reciprocating compressors: (1) First, remove the compressor and open the ports of the exhaust pipe, return pipe, and process pipe. Then invert the compressor, and the refrigeration oil will flow out from the return pipe and process pipe ports. (2) After all the refrigeration oil inside the machine has been poured out, connect a hose to the process pipe of the compressor, with one end of the hose inserted into a measuring cup containing refrigeration oil. Start the compressor and block the low-pressure suction pipe port with your hand; the refrigeration oil will then be sucked into the compressor. 2. Method for changing refrigeration oil in rotary compressors: (1) When changing refrigeration oil in a rotary compressor, first seal the low-pressure pipe of the compressor and pour out the refrigeration oil. Then connect the compound pressure gauge manifold valve to the high-pressure gas pipe of the compressor, with one end of the high-pressure gas pipe connected to a vacuum pump and the hose at the low-pressure valve end inserted into a measuring cup. (2) Start the vacuum pump to create a vacuum inside the compressor, then close the high-pressure valve and open the low-pressure valve. The refrigeration oil in the measuring cup will be sucked into the compressor. When the refrigeration oil reaches the appropriate amount, close the low-pressure valve and stop the oil suction process.

[DelElliott]

Adding refrigerant oil is something I've helped friends with a few times before, mainly for car air conditioning compressors. The system must be absolutely clean. You'll need to prepare professional tools like a vacuum pump and refrigerant oil injector first, then turn off the engine and remove the key before locating the compressor. Next, you have to recover the refrigerant and vacuum out all the air and moisture from the system - typically takes about 20 minutes of vacuuming until the pressure gauge shows negative values to confirm it's done properly. Then measure the refrigerant oil quantity carefully - different compressor types have specific standards, with PAG oil being commonly used. Never pour too much or too little randomly, or you'll risk compressor wear or even burnout. After measuring, slowly inject the oil into the system port using the injector, then recharge with refrigerant before finally starting the system to check for leaks. This job really tests your patience and attention to detail. If you don't have all the proper tools, don't attempt it recklessly to avoid damaging the car or hurting yourself. If your budget allows, I'd recommend just taking it to a reputable repair shop to get it done properly and save the hassle. Safety first!