Brazing - Mitsubishi Electric CMB-WP108NU-AA Service Handbook

[ I Read Before Servicing ]

[6] Brazing

No changes have been made in the brazing procedures. Perform brazing with special care to keep foreign objects (such as oxide
scale, water, and dust) out of the refrigerant system.
Example: Inside the brazed connection
Use of oxidized solder for brazing
1. Items to be strictly observed
Do not conduct refrigerant piping work outdoors if raining.
Use non-oxidized solder.
Use a brazing material (BCuP-3) that requires no flux when brazing between copper pipes or between a copper pipe and
copper coupling.
If installed refrigerant pipes are not immediately connected to the equipment, then braze and seal both ends.
2. Reasons
Refrigerant oil is highly hygroscopic and is likely to cause unit failure if moisture infiltrates into the system.
Residual flux in the refrigerant circuit will cause sludge to form.
3. Notes
Do not use commercially available antioxidants because they may cause the pipes to corrode or refrigerating machine oil to
deteriorate.
HWE2206A
Use of non-oxidized solder for brazing
- 7 - GB