Mitsubishi Electric PURY-RP200 Service Handbook page 58

[ II Restrictions ]
Determining the reusability of the existing piping
Is the refrigerant oil SUNISO, MS,
Barrel Freeze, HAB or Freol?
NO
The vertical height difference needs to be
50m or less between IU and OU (if OU is
below IU, 40m or less). And also, height
difference between each IU is 15m or less.
AND
The vertical separation between IU and BC
controller should be 15 m or less.
NO
Is the piping correctly covered
with heat insulation material?
NO
The existing piping can be reused.
Use a new piping.
HWE10140
Do you know what kind of
NO
refrigerant oil is used in the
existing system?
YES
Please contact your local
distributor.
YES
NO
YES
Does the piping diameter
and piping length match
our guideline?
YES
Aren't two or more indoor units
YES
connected to each BC
controller port?
NO
Do the existing NO
pipes hold enough
air tightness?
YES
YES
NO
All branch pipes are connected
with the indoor units.
YES
NO
YES
Does the piping meet the
strength requirements?
(material,thickness,anti
corrosion)
YES
Exisiting piping cannot be
reused. Use new piping.
If the piping is left disconnected, there is a
possibility of contamination and corrosion
inside the pipe. Do not reuse such pipes.
Make sure the piping length and vertical
separation requirements are met.
Check the type of the branch pipes.
Y-pipes must be replaced with T-pipes
made by Mitsubishi Electric.
Did the existing unit before the
replacement operate without
any gas leak?
YES
Cut the branch pipe completely that are not
in use, and seal it.
Conduct heat insulation.
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Are the existing pipes still
NO
connected with indoor units and the
outdoor units? (excluding sealed
branch pipes that are
not in use)
YES
Is the existing unit
Mitsubishi Electric unit?
NO
YES
Is the capacity of new
replacement unit the same as that
NO
of the existing unit?
YES
Check the piping size and length.
Take the refrigerant oil recovery
procedures described in the Mineral
Oil Collection (Refrigerant Oil
Recovery) Manual.
NO
Please have air tight test on site.
NO
Is the piping air tight?
GB