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5 Drain piping work
Be sure to wind commercially available insulating material (with a form polyethylene's specific gravity of 0.03
and thickness given below) onto all pipes which pass through rooms.
1 Select the thickness of insulating material by pipe size.
Pipe size
. mm to . mm
8. mm to 8.1 mm
2 If the unit is used on the highest story of a building and under conditions of high temperature and humidity, it is necessary
to use pipe size and insulating material's thickness more than those given in the table above.
3 If there are customer's specifications, simply follow them.
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 700 mm 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. Otherwise
the Drain Water Lift-Up Kit cannot be serviced later. Also, the
end connection may be eroded by resin and so cracked.
Insulating material's thickness
More than 10 mm
More than 1 mm
Fig. 5-1
Fig. 5-2
Indoor
unit
Fig. 5-3
25 cm
1.5 – 2 m
Downward pitch of
Insulation
more than 1/100
Take as large as possible. About 10 cm.
Indoor
unit
Collective piping
Hard vinyl chloride 90°
elbow (field supply)
Less than 300 mm
Drain hose
Hard vinyl
(Accessory)
chloride (ø32mm)
(field supply)
Hard vinyl chloride
90° elbow
(field supply)
Support bracket
Indoor
unit
Indoor unit
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