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Drainage Test
Conduct a drainage test after completion of the electrical work.
During the trial, make sure that drain flows properly through the piping and that no water
leaks from connections.
In case of a new building, conduct the test before it is furnished with the ceiling.
Be sure to conduct this test even when the unit is installed in the heating season.
Procedures
Supply about 1000 cc of water to the unit through the air outlet using a feed water pump.
Check the drain while cooling operation.
(g)
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.
(d)
(e)
The stiff PVC pipe put indoor side should be heat insulated.
(f) Avoid putting the outlet of drain hose in the places with irritant gas generated. Do not insert the drain hose directly into
drainage, where the gas with sulfur may be generated.
Set a backwater bend in the middle of drain hose as figure
shown.
Because the drain spout is at the position, which negative
pressure may occur. So with the rise of water level in the drain
pan, water leakage may occur. In order to prevent water
leakage, we designed a backwater bend.
The structure of backwater bend should be able to be cleaned.
As the right figure shown, use T type joint. The backwater
bend is set near the air conditioner.
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 connection of
the drain socket and drain hose (accessory).
(c)
5. 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.
(b)
VP-30
Secure the elevation as high as possible (approx. 100 mm)
A downhill grade of 1/100 or more
H1H2
H1=100mm or the static pressure of
air sending motor
H2=1/2H1 (or between 50~100mm)
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
Good piping
1.5m ~ 2m
Suspension
bolts
Heat
insulation
A downhill grade
of 1/100 or more
Do not pipe under water
Keep free from traps
Avoid riding across an elevation
Air vent
Improper piping
(1)
(2)
(3)
(4)
(a)
(1)
(2)
Installation Precedure
16
Indoor Unit