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DRAIN PIPING
5 DRAIN PIPING
5.1 GENERAL
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N O T E
Install drainage in accordance with national and local codes.
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C A U T I O N
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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.
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Do not connect the drain pipe with sanitary or sewage piping or any
other drainage piping.
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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.
1/25~1/100 Down Slope
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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.
5.2 DRAIN PIPE CONNECTION
1 Prepare a polyvinyl chloride pipe with a 32 mm outer
diameter.
2 Fasten the tubing to the drain hose with an adhesive and
the clamp. The drain piping must be performed with a down-
slope pitch of 1/25 to 1/100.
Gradient of Drain piping
13
PMML0385 rev.0 - 07/2017
Common drain piping
1/25~1/100
down slope
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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.
After performing drain piping work and electrical wiring, check to
ensure that water flows smoothly as in the following procedure:
Checking with drain-up mechanism and float
switch
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Switch ON the power supply.
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Pour approximately 1.8 liters of water into the drain pan.
Then float switch stops the system automatically. In this
operations the drain pump do not stops.
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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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Switch OFF the power supply after.
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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.
3 Insulate the drain pipe after connecting the drain hose.
Insulation (field-supplied)
Clamp
1/25~1/100
down slope
Drain
Polyvinyl chloride tube
piping
(field-supplied)
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