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SMMS 1-Way Cassette YH Type
Installation Manual
SMMS 1-Way Cassette YH Type
Installation Manual
5
Drain Piping
CAUTION
Following the Installation Manual, perform the drain piping work so that water is properly drained. Apply a heat
insulation so as not to cause a dew condensation.
Inappropriate piping work may result in water leakage in the room and wet furniture.
• Provide the indoor drain piping with proper heat insulation.
• Provide the area where the pipe connects to the indoor unit with proper heat insulation. Improper heat insulation
will cause condensation to form.
• The drain pipe must be sloping downward (at an angle of 1/100 or more), and do not run the pipe up and down
(arched shape) or allow it to form traps. Doing so may cause abnormal sounds.
• Restrict the length of the traversing drain pipe to 20 meters or less. For a long pipe, provide support brackets at
intervals of 1.5 to 2 meters to prevent flapping.
• Install the collective piping as shown in the following figure.
• Do not provide any air vents. Otherwise, the drain water will spout, causing water to leak.
• Do not allow any force to be applied to the connection area with the drain pipe.
Pipe material, size and insulator
The following materials for piping work and insulating process are procured locally.
Connecting drain pipe
Insert the drain hose into the connector until the hose can go no farther.
REQUIREMENT
• Connect the hard vinyl chloride pipes certainly so that water does not leak by using adhesive agent for vinyl chloride.
• It takes some time to dry and indurate the adhesive agent. (Refer to the manual of adhesive agent.) Do not apply any
extra force on the connecting section until the adhesive agent dried.
Pipe material
Hard vinyl chloride pipe VP25 (Nominal outer diameter Ø32 mm)
Insulator
Foamed polyethylene foam, thickness: 10mm or more
1.5 m to 2 m
Support
bracket
Downward slope
1/100 or more
Arched shape
Trap
Downward slope
1/100 or more
(Collective
piping)
As long as possible
(Approx. 10 cm)
Heat
insulator
Incorrect
VP30
Drain up
Check the draining
In the test run, check that water drain is properly performed and water does not leak from the connecting part of
the pipes. When doing this, also check that no abnormal sounds are heard from the drain pump motor. Check
draining also when installed in heating period.
When the electrical and wiring work has been completed
Pour some water by following the method shown in the following figure. (Amount of water poured: 500 cc) Then,
while performing a cooling operation, check that the water drains from the drain pipe connecting port (transparent)
and that no water is leaking from the drain pipe.
When a down-gradient cannot be secured for the drain pipe, drain-up piping is
possible.
• The height of the drain pipe must be 350 mm or less from the underside
of the indoor unit.
• Take the drain pipe out of the drain pipe joint with the indoor unit in 100
mm or less, and bend up the pipe vertically.
• Immediately after the pipe is bent up vertically, lay the pipe making a
down-gradient.
100 mm or less
Indoor unit
Do
no
t ra
ise
th
e
ho
se
to
35
0 mm or
mor
e
.
Do no
t ra
ise
th
e hos
e
to
15
0 mm
or
mo
re
.
Air discharge
Pitcher
21-EN
22-EN
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