Storage Of Piping; Pipe Processing - Mitsubishi Electric CMB-WP108NU-AA Service Handbook

[ I Read Before Servicing ]

[4] Storage of Piping

1. Storage location
Store the pipes to be used indoors. (Warehouse at site or owner's warehouse)
If they are left outdoors, dust, dirt, or moisture may infiltrate and contaminate the pipe.
2. Sealing the pipe ends
Both ends of the pipes should be sealed until just before brazing.
Keep elbow pipes and T-joints in plastic bags.
Refrigerant oil is highly hygroscopic and is likely to degrade and cause compressor failure if moisture infiltrates into the sys-
tem. Storage of piping materials requires stringent management.

[5] Pipe Processing

Use a small amount of ester oil, ether oil, or alkylbenzene to coat flares and flanges.
Prevent the particles that are generated during pipe cutting or cut edge treatment from entering the pipes. If abrasive materials
contained in sandpaper or cutting tools enter the refrigerant circuit, they may cause the compressor, valves, or other refrigerant
circuit components to fail.
Use a minimum amount of oil.
Use only ester oil, ether oil, and alkylbenzene.
To deburr pipes, use a reamer or other deburring tools, not sandpaper.
To cut pipes, use a pipe cutter, not a grinder or other tools that use abrasive materials.
When cutting or deburring pipes, do not allow cutting chips or other foreign matters to enter the pipes.
If cutting chips or other foreign matters enter pipes, wipe them off the inside of the pipes.
HWE2206A - 6 - GB