17
A5HDC-2009
Application Information
(5) Handling and installation guidelines
Like R22 system, the handling and installation of R410A system are closely similar.
All precautionary measures; such as ensuring no moisture, no dirt or chips in the
system, clean brazing using nitrogen, and thorough leak check and vacuuming are
equally important requirements. However, due to its hydroscopic POE oil, additional
precautions must be taken to ensure optimum and trouble free system operation.
(a) During installation or servicing, avoid prolong exposure of the internal part of the
refrigerant system to moist air. Residual POE oil in the piping and components can
absorb moisture from the air.
(b) Ensure that the compressor is not exposed to open air for more than the
recommended time specified by its manufacturer (typically less than 10 minutes).
Removed the seal plugs only when the compressor is about to be brazed.
(c) The system should be thoroughly vacuumed to 1.0 Pa (700mmHg) or lower.
This vacuuming level is more stringent than R22 system so as to ensure no
incompressible gas and moisture in the system.
