Drain Piping; Drain Pipe Connection - Hitachi RPF-1.0 FSN2E Installations- Und Betriebshandbuch

DRAIN PIPING

5 DRAIN PIPING
5.1 GENERAL
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C A U T I O N
• Do not create an upper-slope or rise for the drain piping, since drain
water will flow back to the unit and leakage to the room will occur
when the unit operation is stopped.
INCORRECT
Incorrect: upward slope
Incorrect: rising part
• Do not connect the drain pipe with sanitary or sewage piping or any
other drainage piping.
• When the common drain piping is connected with other indoor units,
the connected position of each indoor unit must be higher than the
common piping. The pipe size of the common drain pipe must be
large enough according to the unit size and number of unit.
CORRECT
1/25~1/100 down slope
Common drain piping

5.2 DRAIN PIPE CONNECTION

1 Prepare a polyvinyl chloride pipe with a 18.5 mm outer
diameter.
2 Insulate the drain pipe after connecting the drain hose as
shown.
7 PMML0159A rev.3 - 05/2016
Drain piping connection
• Drain piping will require insulating if the drain is installed in a location
where condensation forming on the outside of drain pipe may drop
and cause damage. The insulation for the drain pipe must be selected
to insure vapor sealing and prevent condensation forming.
• Drain trap should be installed next to indoor unit. This trap must be
designed to good practice and be checked with water (charged)
and tested for correct flow. Do not tie or clamp the drain pipe and
refrigerant pipe together.
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N O T E
Install drainage in accordance with national and local codes.
After performing drain piping work and electrical wiring, check to
ensure that water flows smoothly as in the following procedure:
Checking Unit without Drain-up Mechanism
• Pour approximately 1.8 liters of water into the drain pan.
• Check to ensure that the water flows smoothly or whether no
water leakage occurs. When water cannot be found at the
end of the drain piping, pour another approximately 1.8 liters
of water into the drain pan.
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N O T E
Pay attention to the thickness of the insulation when the left side piping is
performed. If it is too thick, piping can not be installed in the unit.
Drain hose
Insulation (field-supplied)
Polyvinyl chloride tube
(field-supplied)