Installation Precedure
Indoor Unit
5. Drain Piping
(a) Drain piping should always be in a downhill grade (1/50~1/100) and avoid riding across an elevation or making traps.
Good piping
Suspension | 1.5m ~ 2m |
bolts |
|
A downhill grade 
Heat of 1/100 or more 
insulation
Improper piping
Avoid riding across an elevation
Air vent | Keep free from traps |
Do not pipe under water
(b)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.
(c)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).
(d)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
(e)The stiff PVC pipe put indoor side should be heat insulated.
| Stage |
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Drain socket | difference Drain hose | ||
part |
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| |
Drain socket |
|
|
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Pipe cover(large) | |||
[for insulation] | (field purchased) | ||
(accessory) |
|
| |
Main unit |
|
|
|
Drain hose |
| ||
(accessory) |
| (field purchased) | |
Clamp | Adhesion | Pipe cover [for insulation] | |
(accessory) |
|
| (field purchased) |
Pipe cover(small) [for insulation] |
|
| |
(accessory) |
|
|
|
Secure the elevation as high as possible (approx. 100 mm)
A downhill grade of 1/100 or more
(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.
(g)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.
H1 |
H2 |
H1=100mm or the static pressure of air sending motor
H2=1/2H1 (or between 50~100mm)
Drainage Test
(1)Conduct a drainage test after completion of the electrical work.
(2)During the trial, make sure that drain flows properly through the piping and that no water leaks from connections.
(3)In case of a new building, conduct the test before it is furnished with the ceiling.
(4)Be sure to conduct this test even when the unit is installed in the heating season.
Procedures
(1)Supply about 1000 cc of water to the unit through the air outlet using a feed water pump.
(2)Check the drain while cooling operation.
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