Notes For Work Procedures - Panasonic Urban Multi MX1R Series Service Manual

PACD011001C2
7.2

Notes for Work Procedures

Brazing connections
„ With the new type of refrigerant, much more care must be paid to keep impurities from coming in. In
„ In any other connecting works, much stricter process control is needed to prevent impurities from
Flaring work
„ Chamfer (file) the pipe ends as specified. Be very careful not to allow cutting to come into the pipes.
„ To avoid leak, apply a proper amount of refrigerant oil over the inner and outer surfaces of each flared
Charging refrigerant
„ Be sure to charge the new-type refrigerant in liquid phase via the service port of the liquid-side stop
Air-tightness test
„ Be sure to conduct air-tightness test.
For servicing the models with the new-type refrigerant, strictly follow the above instructions and
Caution
precautions. Otherwise the system may get in trouble. For details on handling the new-type refrigerant and
the related work procedures and tools, refer to the Installation/Test Run Manual published by
MATSUSHITA.
Appendix
brazing the pipes, be sure to blow the pipe using nitrogen gas.
coming into the pipes. For this purpose, take appropriate measures such as covering the pipes and do
the vacuum drying.
section. As the refrigerant oil, be sure to use synthetic oil (ether oil, ester oil, alkyl benzene oil or their
mixture).
valve (outdoor unit). At this time, give vacuum drying with a vacuum pump. Never try the air purging.
Precautions in Servicing The Models with New-type Refrigerant
621