User`s manual
42
Suction gas pipe
Liquid pipe
PFD1123-E PFD1123-E PFD1123-E
90 56 36 56
28 90
36 90
PFD1123X4-E
PFD1123X4-E PFD1123X4-EPFD1123-E PFD2803-E
56 56
28 90
36 56
28 90
36 90 14036
Discharge gas pipe
Installation of Interconnecting Pipework
Mitsubishi KXR6 equipment is manufactured to
the highest standards of quality and reliability.
It is imperative the method of installation and
the materials used are also to high standards,
to ensure trouble free operation and long term
reliability.
The interconnecting pipework must be installed
by a competent and trained engineer.
Refrigeration quality copper tube must be used,
soft copper coils or half-hard straight lengths.
The refrigeration quality tube must be soft
drawn seamless high grade copper pipe. The
copper tube must be selected taking into
account the higher operating pressures of
R410A refrigerant, and that high pressures will
occur throughout the system because of the
reverse cycle operation. All pipework material
used should be EN12735 European standard.
The supplied branch pipe kits, must be used
to make connections to indoor units, and the
supplied manifold kits must be used to make
connections between outdoor units (where
applicable); it is not permitted to use standard
fittings such as elbows, tees etc. The branch
pipes shall be installed in accordance with the
manufacturer’s instructions, allowing
unrestricted flow of refrigerant, and in
accordance with European standard E378:2000.
All brazed joints shall be made with dry
nitrogen purge to ensure the prevention of
oxidisation to the internal surface of the copper
pipes.
The ingress of moisture, dirt and any other
contaminants to the interior of the copper
pipes, and air conditioning units, must be
prevented during the installation procedure.
After the installation of pipework, prior to the
connection of the outdoor units, and sealing of
insulation joints, the pipework must be
pressure tested for leakage, using dry nitrogen.
Additional Refrigerant
Additional R410A refrigerant only shall be used,
and must be charged by weight only, using
electronic scales. The amount of additional
refrigerant must be accurately calculated from
the manufacturerÃs data, based on the length
and diameter of each section of the liquid
refrigerant pipework of the system.
Single outdoor unit piping examples:
refrigerant piping