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Replacing Sealed System Components
Evacuation and Charging Procedure
The following information covers the evacuation and charging procedure for sealed system work.
WARNING:
Before cutting or using a torch on refrigerant tubes, recover the refrigerant from the system using
approved recovery equipment.
Never charge new refrigerant through the purge valve. This valve is always located on the high
pressure side of the system.
Never apply heat from any source to a container of refrigerant. Such action will cause excessive
pressure in the container.
Always wear appropriate PPE (Personal Protective Equipment) when working with refrigerants and
nitrogen holding a charge in some replacement parts. Contact with these gases may cause injury.
1. Evacuate the system to ~20-in. vacuum using the refrigerator compressor and/or recovery pump.
2. Purge the system using nitrogen at 25-35 SCFH.
3. Perform necessary repairs to the sealed system.
4. Pressurize the system to 250 PSIG with nitrogen and test for leaks.
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the system back into a vacuum.
6. &KDUJH WKH V\VWHP ZLWK WKH H[DFW DPRXQW RI UHIULJHUDQW VSHFL¿HG RQ WKH QDPH SODWH RU VSHFL¿HG RQ
the instruction sheet included with the component being replaced.
7. Reinstall caps to Schrader ports.
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