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Service plate
Pour water into the drain pan using hose, etc.
c.
6
DRAIN PIPING WORK
CAUTION
• Following the Installation Manual, perform the drain piping work so that water is properly drained, and apply a heat
insulating so as not to cause a dewing. Inappropriate piping work may result in water leakage in the room and wet
of furniture.
REQUIREMENT
• The draining method is a natural draining. Therefore, slope the piping outside of the unit downward
(at 1/50 to 1/100), and do not put an angle halfway. If doing so, an abnormal sound may be caused.
• To prevent overflow of drain pipe, set a drain trap on its way as shown in the right figure.
[The drain trap is required for preventing aspiration of smell through the drain pipe, and also for preventing
hardness of draining because the differential pressure between the drain pan and atmosphere becomes large
when the external static pressure is high (especially, at suction side).]
• Dust inside of the drain pipe is easy to be heaped at the drain trap.
Be sure to set a plug so that the drain trap can be cleaned.
• Maximum horizontal drain pipe length should be less than 20m or shorter.
If the pipe is long, set the support brackets with 1.5 to 2m interval to prevent waving.
• Mount the collective drain pipe as shown in the right figure.
• Do not mount an air purge pipe.
Otherwise drain water spouts out resulted in water leak.
• Do not apply strength to the connecting part with the drain pipe.
• Do heat insulating securely to the indoor drain pipe.
• Be sure to do heat insulating to the connecting part with the
indoor unit. Incomplete heat insulating may cause dewing.
• Do not directly connect the drain pipe to the drainage, etc. with
ammonia smell; otherwise there is a possibility that ammonia
ingredient of the drainage passes through the drain pipe and corrodes the heat exchanger of the indoor unit.
Piping/Heat insulating material
The following materials as below for piping and heat
insulating prpcess are procured locally.
Piping
Hard vinyl chloride pipe
VP25 (Outer dia. : Ø32mm)
Heat insulator
Vesicant polyethylene :
Thickness 10mm or more
Check the draining
Check the water drainage is surely performed at the trial
operation. Check also no water leakage is found at the
pipe connecting part.
REQUIREMENT
• Be sure to check draining even if installing the unit in heating season.
• Using a kettle or hose, pour water gradually from the drain pan at the air supply port.
Drain up
When not securing down slope on the drain pipe, use a
drain up kit sold separately.
Also refer to the “Drain up kit installation manual”.
Check the draining
After drain piping work, check that water drain is properly
performed and water does not leak from the connecting
part of the pipes.
In this time, check also there is no abnormal sound of the
motor of the drain pump.
Be sure to check draining when installed in the heating
period.
VP-30
Keep long as possible
(Approx. 10cm)
Downward pitch
1/100 or more
