How to add refrigerant to the condensing unit?
The working procedure for adding refrigerant to the refrigeration system of the unit should be carried out after the vacuum pumping of the refrigeration system is completed, Piston type Compressor Unit in order to prevent air infiltration caused by internal vacuum in the system.Screw type Compressor Unit
Before adding refrigerant to the refrigeration system of the unit, the circuit of the solenoid valve in the system should be connected to keep it open. The first time refrigerant is added, liquid refrigerant should be added from the filling port on the high-pressure valve or reservoir of the unit.Air Cooled type Condenser Unit If conditions permit, a drying filter can be installed on the filling pipe between the unit and the Freon cylinder to prevent moisture and impurities in the refrigerant from entering the system.Water Cooled type Condenser Unit
The initial refrigerant filling amount can be 80% of the rated value required by the refrigeration system, and the initial filling amount should not be too much.Evaporator Unit
For large refrigeration systems, after filling, the unit should stand still for about 30 minutes. After the internal pressure of the standby refrigeration system stabilizes, the compressor can be started to run (for water-cooled units, the cooling water system should be started first), and the operation status of the refrigerant can be observed. Generally, the flow status of the refrigerant can be observed from the system's sight glass to determine whether the refrigerant filling amount is appropriate. If the refrigerant is insufficient, You can add an appropriate amount of gaseous refrigerant from the low-pressure detection port until the bubbles in the sight glass disappear, the evaporator is filled with even frost, and the compressor return pipe is covered with thin frost, which can determine the appropriate amount of refrigerant added to the refrigeration system.Mobile Cold Room
In most cases of cold storage refrigeration systems, gaseous or liquid refrigerant can be filled from the low-pressure side. When the refrigerant filling amount is large, liquid refrigerant filling method can also be used from the high-pressure side. Attention required! If filling liquid refrigerant from the low-pressure side, be sure to add it slowly to avoid liquid shock! If you are afraid of liquid impact, gas filling can also be used.Refrigeration Project and Construction
Method of adding refrigerant from the low-pressure side:
When filling gaseous refrigerant from the low-pressure side, first rotate the low-pressure three-way shut-off valve counterclockwise to the endpoint, then connect the fluorine filling tube of the fluorine bottle to the bypass screw seat of the low-pressure three-way shut-off valve. Then, open the bottle valve of the R22 fluorine bottle, slightly loosen the joint of the bypass screw seat of the three-way shut-off valve, use R22 gas to drive out the air in the fluorine filling tube, and immediately lock it when you hear a "sizzling" airflow sound at the joint, Refrigerant charging begins.
After the injection amount reaches the specified quality, close the fluorine bottle shut-off valve, rotate the low-pressure three-way shut-off valve counterclockwise to the endpoint, close the bottle valve of the R22 fluorine bottle, remove the fluorine adding tube, and the fluorine adding work is completed.