Mitsubishi Electric PUHY-RP200, Service Handbook, Page: 15 / 306

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HWE10130 GB
[5] 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
1. Items to be strictly observed
ΠDo not conduct refrigerant piping work outdoors if raining.
ΠUse non-oxidized solder.
ΠUse a brazing material (BCuP-3) that requires no flux when brazing between copper pipes or between a copper pipe and
copper coupling.
ΠIf installed refrigerant pipes are not immediately connected to the equipment, then braze and seal both ends.
2. Reasons
ΠRefrigerant oil for use with R410A is more than ten times as hygroscopic as the conventional refrigerant oil and is more likely
to introduce moisture into the system, requiring special care in handling to prevent malfunctions.
ΠDo not use flux, which usually contains chloride and form sludge in the refrigerant circuit.
3. Notes
Do not use commercially available antioxidants because they may cause the pipes to corrode or refrigerating machine oil to
deteriorate.
Use of oxidized solder for brazing Use of non-oxidized solder for brazing