Drain Piping
Drain piping should always be in a downhill grade (1/50~1/100) and avoid riding across an elevation or making traps.
When connecting the drain pipe to unit, pay suffcient attention
not to apply excess force to the piping on the unit side. Also, fix
the piping at a point as close as possible to the unit.
For drain pipe, use hard PVC general purpose pipe VP-25(I.D.1")
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).
Drain hose
Stage
difference
part
Drain socket
Drain socket
Main unit
VP-25 joint
(field purchased)
Pipe cover(large)
[for insulation]
(accessory)
VP-25
(field purchased)
Pipe cover
[for insulation]
(field purchased)
Drain hose
(accessory)
Pipe cover(small)
[for insulation]
(accessory)
Clamp
(accessory)
Adhesion
Do not pipe under water
Keep free from traps
Avoid riding across an elevation
Air vent
Improper piping
Good piping
1.5m ~ 2m
Suspension
bolts
Heat
insulation
A downhill grade
of 1/100 or more
(b)
(c)
VP-30
Secure the elevation as high as possible
(approx. 100 mm)
A downhill grade of
1/100 or more
Right overhead
Drain hose
Joint for VP-25
(Local procurement)
600
(Maximum local drain up dimension)
290~325mm
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.
(d)
(e)
(f)
(g)
(a)
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.
The hard PVC pipe put indoor side should be heat insulated. Do
not ever provide an air vent.
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 500 mm, the back-flow quantity of
drain at the event of interruption of the operation gets too much
and it may cause overflow at the drain pan. Therefore, make the
height of the drain pipe within the distance given in the sketch
below.
Drain Pipe
Installation Procedure
24
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