Refrigerating oil replacement operation method

Refrigerating oil replacement operation method One. Replacing the freezing oil without internal cleaning: The compressor performs the pumping action, recovers the system refrigerant to the condenser side (note that the minimum suction pressure of the pumping action is not less than 0.5KG / cm2g), excludes the refrigerant in the compressor, retains some internal pressure as the power source, and freeze Oil is discharged from the oil drain angle valve of the compressor. The compressor oil drain angle valve is shown in the following figure (1). After the freezing oil is removed, this operation can be performed. Note: The clearing hole flange (cover) and oil level switch flange (cover) are installed in the same position. The oil level switch flange is an optional component. Schematic diagram (2) The angle valve is closed. At this time, the suction force of the vacuum pump can be used to draw new refrigeration oil from the drain valve into the compressor through the conduit. After reaching the standard refueling amount, the drain valve is closed and the vacuum is continued to the standard requirements, which is completed Oil change operation. This prevents the system from leaking air and causing difficulties in subsequent operations. It is recommended to select the high (low) pressure side angle valve (as shown in schematic diagram 2) or other relatively high position for the contact point of the vacuum pump to prevent damage to the vacuum pump by pumping refrigeration oil.

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