Haier MRV II Instruction Manual page 12

cause system block.
5.4 When welding the pipe, please blow nitrogen to prevent oxidation,
pressure of nitrogen flow is about 0.02Mpa , otherwise the oxid layer on
pipe inside will clog the pipe or damage the compressor.
5.5 Welding connection needs a changeable diameter pipe, the pipe
inserted depth is : 10 mm : below φ19mm ; 15mm: above φ 22mm
5.6 When working on the end of the pipe with metal saw or file, do not let
the copper scrap into the pipe.
5.7 The flared type pipe made by expansion tools must conform to the
relative standard, if not, it must be reworked.
5.8 For flared type connection ，please daub some freeze oil on inside
and outside of pipe to avoid pipe bend.
5.9 Refrigerant pipe should be installed horizontally or vertically and as
short as possible ,protect the exposed part with ornament board. To avoid
wrong connection, the pipe need to be marked every other end, set a
bracket exclusively at the joint between piping and unit , do not make unit
afford any weight .
5.10 Branch pipe should be installed in horizontal or vertical direction,
otherwise that will affect the air conditioner effect.
Right
Horizontal
Floor
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Floor
Wrong
Part 1