Hitachi RAC-18WPC, Service Manual, Page: 7 / 43

Figure showing the installation of lndoor and Outdoor unit
MODEL RAC-18WPC
RAC-25WPC
The refrigerating machine oil is
easily affected by moisture. Use
caution to prevent water from
entering the cycle.
The difference in height between
the indoor and outdoor unit
should be kept below 10m.
The connecting pipe, no matter
big or small, should all be
insulated with insulation pipe and
then wrapped with vinyl tape.
(The insulator will deteriorate if
it is not wrapped with tape).
The connection of insulated drain
hose.
Inner diameter 16mm
Please use insulated drain hose for
the indoor piping (commercial
product)
The clearances of the
unit from top, left, right
and front are specified
in figure below. At least
three of the above sides
must be open air.
Maximum pipe length 20m Minimum pipe length 3m
give clear
as wide a
possible
200mm
above 200mm
above 100mm
300mm
above
above 50mm
above
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