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5. Drain piping work
(1) Ensure that the drain piping is downward (pitch of more than 1/100) to
the outdoor (discharge) side. Do not provide any trap or irregularity on
the way. (Fig. 5-1)
(2) Ensure that any cross-wise drain piping is less than 20 meters
(excluding the difference of elevation). If the drain piping is long,
provide support bracket to prevent it from waving. Never provide any
air vent pipe. Otherwise drain may be ejected.
(3) Use a hard vinyl chloride pipe ø32 mm (1-1/4 inch) for drain piping.
(4) Ensure that collected pipes are 10 cm lower than the unit body's drain
port. (Fig. 5-2)
(5) Do not provide any odor trap at the drain discharge port.
(6) Put the end of the drain piping in a position where no odor is
generated.
(7) Do not insert the end of the drain piping into any sewer where sulfuric
gases are generated.
(8) The intake of the drain piping can be made 55 cm higher than the
Indoor unit. If there are some obstacles under the ceiling, use elbows
to make it at least height according to the site. (Fig. 5-3)
(9) Be sure to use the supplied drain hose (Accessory).
Connect each connection with vinyl chloride adhesive. But never use
any adhesive over the indoor unit discharge port. Otherwise the Drain
Water Lift-Up Kit cannot be serviced later. Also, the end connection
may be eroded by resin and so cracked.
Note:
If the rise portion is long, there will be a lot of returned water in
an operation stop, generating slime or odor during off-season.
Ensure that the rise portion is at a minimum.
CAUTION
Pipe the drain piping to ensure that it discharges drain, and
insulate it to prevent dew condensation. A failure to the piping
work may cause water leakage and so wet your property.
Downward pitch of
more than 1/100
Indoor
unit
Hard vinyl
chloride
(ø32 mm)
(field supply)
Hard vinyl chloride
90˚ elbow
(field supply)
5
Support bracket
1.5 – 2 m
25 cm
Insulation
Take as large as possible. About 10 cm.
Indoor
Indoor
unit
unit
Collective piping
Hard vinyl chloride 90˚
elbow (field supply)
Less than 300 mm
Drain hose
(Accessory)
Indoor unit
Tie band (small)
(Accessory)
Fig. 5-1
Fig. 5-2
Fig. 5-3
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