How to Use Refrigerant?
2 Answers
To perform a leak test on the unit or tank where refrigerant is to be added, there are various methods available, such as positive and negative pressure holding, water testing, foam method, leak detector, etc. After the leak test, the unit or tank should be evacuated. If the manufacturer has specific requirements, the evacuation time can be extended. Refrigerant should be added by monitoring the pressure. Use a dual-head refrigerant gauge to connect and add the refrigerant, and close the valve once the desired pressure is reached.
I just recharged the refrigerant myself last week, so first remind you to prepare gloves and goggles. When buying refrigerant, confirm whether it's R134a or the newer R1234yf - using the wrong type can damage the compressor. Locate the low-pressure port marked with an L in the engine compartment (usually with a blue or black cap on metal tubing), then start the AC at max fan speed and lowest temperature. After securely connecting the hose adapter, shake the refrigerant can and turn it upside down so the liquid can flow in. Keep an eye on the pressure gauge needle - don't exceed 35psi, as overcharging can cause icing or white mist. If you see oil stains on the lines or the AC stops cooling within three days after recharge, there's likely a leak in the seals that needs immediate inspection.
