88
Drain Piping
(a)
Drain piping should always be in a down hill grade (1/50-1/100) and avoid riding across an elevation or making
traps.
(b) When connecting the drain pipe to unit pay suffcient attention
not to apply excess force to the piping on the unit side. Also x
the piping at a point as close as possible to the unit.
(c) For unit without water pump, please refer to the digram and select
drain pipe size according to drain opening inner diameter size.
The drain pipe shall be slant downwards (greater than 1/100).
The horizontal length of the drain pipe shall be less than 20 m.
In case of long pipe, supports shall be provided every 1.5-2m to
prevent wavy form.
Central piping shall be laid out according to the right gure.
Take care not to apply external force onto the drain pipe connection part.
(d)
For unit with water pump drain pipeuse hard PVC general purpose
pipe VP which can be purchased locally. When connecting, insert
a PVC pipe end securely into the drain socket before tightening
securely using the attached drain hose and clamp. Adhesive must
not be used for connection of the drain socket and drain hose
(accessory).
(e)
When constructing drain piping for several units, position the
common pipe about 100 mm below the drain outlet of each unit
as shown in the sketch Use VP-30(11/4") or thicker pipe for this purpose
.
(f)
The hard PVC pipe put indoor side should be heat insulated. Do not
ever provide an air vent.
(g)
The height of the drain head can be elevated up to a point 500 mm
above the ceiling, and when an obstacle exists in the ceiling space,
elevate the piping to avoid the obstacle using an elbow or corresponding
gadget. When doing this, if the stretch for the needed height is higher
than 500mm, the back-ow quantity of drain at the event of interruption of
the operation gets too much and it may cause overow at the drain pan.
Therefore, make the height of the drain pipe within the distance given in
the sketch below.
(h)
Avoid positioning the drain piping outlet at a place where generation
of odor may be stimulated. Do not lead the drain piping direct into
a sewer
from where sulfur gas may generate.
Unit model The size of drain opening
AD50S2SM1FA AD71S2SM1FA φ21mm
To Next Page
Loading...
