How to add refrigerant when the air conditioner is not cooling?

1. Filling Freon by the high-pressure valve 1. The injection method is next to the high-pressure valve. There is a special fluorine-filled hose with a thimble through the hole. First, tighten the thimble connector to remove the air in the hose, and then open the valve , Inject Freon into the high pressure side of the air conditioner at the valve port. 2. Tips When the pressure in the body and the container is balanced, Freon will stop flowing into the machine. At this time, warm water can be used to heat, increase the temperature, once to increase the pressure in the container, so that the Freon liquid continues to flow into the refrigerant.com/hfc-refrigerant' target='_blank'>refrigeration system. The compressor must be kept stopped during the entire operation. 3. Matters needing attention Generally, freon filling from the high-pressure side is suitable for equipment with a large number of filling or equipment with liquid storage, and freon will be weighed in advance. When the conditions for “weighing” are not available, the filling volume is estimated by experience. For equipment that does not have liquid storage or requires precise filling volume, part of the freon can be supplemented or discharged according to the method of filling freon from the low pressure valve. 2. Low pressure Valve filling freon 1. When the air conditioner with small applicable demand requires less refrigerant, the method of filling freon gas from the low pressure side is generally used. This method is slow in filling speed, but easy to control and safe. 2. Injection method There is also a special hose next to the low pressure valve. The other end of the hose is connected to the meter valve. First connect the freon container to the meter valve (if you need to vacuum, connect the vacuum pump and then transfer the freon container). Tighten the thimble connector and use the The freon vapor flushes out the air in the hose. 3. How to balance the pressure? After filling the refrigerant, start the air conditioner, and after the operation is stable, observe the low pressure pressure value to judge the amount of freon in the system, if it is insufficient, open the container valve , Continue to inject freon gas into the refrigeration system, while observing and controlling the low pressure pressure, and finally adjust to the standard evaporation pressure of the air conditioner. Fill freon from the low pressure valve, and freon enters the system as a gas. When the gas pressure in the container is the same as the pressure in the system When balancing, warm water can be used to heat the freon container to increase the gas pressure and make it easier for freon to flow into the system. Do not turn freon capacity upside down during operation to prevent 'liquid hammer' accidents.

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