How To Fill Refrigerants Into System?

- Oct 06, 2019-


 How to fill refrigerants into system? The operation of the refrigeration or air conditioning system depends on the appropriateness of the refrigerant charged, the insufficient refrigerant in the system will cause the evaporator evaporation insufficient, resulting in the compressor suction pressure is too low, the cold volume is reduced and the compressor may overheat.

  Excessive addition can cause too much refrigerant to enter the condenser, resulting in excessive exhaust pressure, liquid refrigerant reflux, and possibly even damage to the compressor.


  Liquid charge: Liquid refrigerant is filled much faster than gaseous refrigerants, and because of this factor, large field installation systems are always filled with liquid refrigerants. A fluid filling valve is required on the liquid pipe, or a fluid outlet outlet valve with a fluid joint or a reservoir port with a fluid port on the high-pressure side of the system. Refrigeration Encyclopedia Public recommends using a drying filter to add liquid. To prevent any contaminants from inadvertently entering the system.

  It is not recommended to add liquid refrigerant directly through the access valve interface on the compressor exhaust pipe for a long time, as this can cause damage to the compressor.


Add liquid method: Add the refrigerant to the system through the fluid-filling valve on the main fluid pipe. 

     Note: Pour the refrigerant cylinder onto the scale and the reservoir shut-off valve acts as a throttle to facilitate the flow of refrigerant from the bottle into the system. On the first installation, the entire system should be vacuumed into a high vacuum. Weigh the weight of the refrigerant bottle and connect the fluid tube on the refrigerant bottle to the fluid valve. The gas from the fluid pipe is then removed and the bottle valve and the fluid valve are opened. 

     The vacuum in the system causes the fluid to be inhaled through the fluid intake until the pressure of the system is equal to the pressure in the refrigerant bottle. Close the receptacle outlet valve and start the compressor. Liquid refrigerant spits from the refrigerant bottle into the liquid pipe and accumulates in the condenser and reservoir through the evaporator. In order to determine whether the charge flow has met the requirements of the system, open the reservoir outlet valve, close the fluid injection valve, observe the operation of the system, until the system has the specified refrigerant.

Call the refrigerant bottle again and record the charge of the system. Keep a close eye on the exhaust gauge and the rapid rise in pressure indicates that the condenser is filled with refrigerant fluid. 

  And has exceeded the system's pumping capacity, if this happens, immediately stop filling from the liquid bottle and open the receptacle outlet valve.


  Gas-state charge: When only a small amount of refrigerant up to 12 kg is required to be filled into the system, the gaseous charge method can be used, which is more accurate than the addition of liquid. In the gaseous charging is usually installed with a pressure gauge in the compressor suction service valve port, before filling to weigh the weight of the refrigeration bottle, the pressure gauge valve pipe and suction, exhaust service valve connection. And connect the common interface to the refrigerant bottle. 

  Remove the gas from the pipe, open the steam valve of the refrigerant bottle, start the compressor, and use the pressure tube valve to adjust the charge.


In order to determine whether sufficient refrigerant has been added, close the refrigerant cylinder valve, and observe the operation of the system, continue to add refrigerant until the filling is appropriate, then call the refrigerant bottle and note the refrigerant weight added to the system, refrigeration encyclopedia public prompt, in the filling process, pay attention to the exhaust pressure, to ensure that the system does not charge too much.

how to fill refrigerants in the system