Drain Piping - Toshiba MMU-UP0071MH-UL Installation Manual

5

Drain piping

CAUTION CAUTION
Following the Installation Manual, perform the drain
piping work so that water is properly drained, and
apply a heat insulation so as not to cause a dew
drop.
Inappropriate piping work may result in water
leakage in the room and wet of furniture.
 Piping / Heat insulating
material
Require the following materials for piping and heat
insulating at site.
Hard vinyl chloride pipe VP20
Piping
(Outer dia.: 1.0" (26 mm))
Foam polyethylene:
Heat insulator
Thickness 0.4" (10 mm) or more
 Flexible hose
Use the attached flexible hose to adjust centre
discrepancy of the hard vinyl chloride pipe.
• Do not use the flexible hose as stretched, or do not
deform.
• Fix the soft end of the flexible hose with the attached
hose band.
• Use the flexible hose on a horizontal level.
Incorrect Correct
Bend
Bend
(Trap)
Bend Straight
13-EN
REQUIREMENT
• Perform heat insulation of the drain pipes of the indoor
unit.
• Perform heat insulation of the connecting part with the
indoor unit.
An incomplete heat insulation causes dew drop.
• Set the drain pipe with downward slope (1/100 or
more), and do not make swelling or trap on the piping.
It may cause an abnormal sound.
• For length of the traversing drain pipe, restrict to 65.6'
(20 m) or less.
In case of a long pipe, provide support brackets with
interval of 4.9' - 6.6' (1.5 - 2 m) in order to prevent
waving.
4.9' - 6.6'
Support
(1.5 - 2 m)
bracket
1/100 or more
Heat insulator
downward
Arched
shape
Incorrect
Trap
• Set the collective piping as shown in the below figure.
As long as possible (3.9" (100 mm))
VP20 VP20 VP20
VP30 or more
Downward slope
1/100 or more
• Do not apply force to the connecting part of the drain
pipe.
• The hard vinyl-chloride pipe cannot be directly
connected to the drain pipe connecting port of the
indoor unit.
For connection with the drain pipe connecting port, fix
the attached flexible hose with the hose band,
otherwise a damage or water leak is caused on the
drain pipe connecting port.
– 7 –
Align the attached
Drain pipe
hose band to the end
connecting
of hose, set the
port
VP20 vinyl chloride
tightening position
pipe
upward, and then
(Locally procured)
tighten it.
Soft socket Soft socket
Adhesive agent
prohibited
• Adhesive agent cannot be used for the pipe
connecting port (Soft socket) of the indoor unit.
Be sure to use the attached hose band for fixing,
otherwise damage or water leakage of the drain pipe
connecting port is caused.
0.4" (10 mm) or less
Flexible
drain hose
Indoor
unit
0.5 ± 0.2" (12 ± 5 mm)
Hose band
Tightening torque:
2.2 ~ 2.6 lbs•ft
(3.0 ~ 3.5 N•m)
Min 1.1" (28 mm)
 Connecting drain pipe
• Connect VP20 hard vinyl chloride pipe (Locally
procured) to flexible drain hose using attached hose
band.
 Drain up
When a down-gradient cannot be secured for the
drainpipe, drain-up piping is possible.
• The height of the drain pipe must be 33.5" (850 mm)
or less from the bottom of the ceiling.
• Take the drain pipe out of the drain pipe joint with the
indoor unit in 11.8" (300 mm) or less, and bend up
the pipe vertically.
• Immediately after the pipe is bent up vertically, lay
the pipe making a down-gradient.
• Set downward grading immediately after raising up
vertically.
11.8" (300 mm)
or less
Indoor unit
Underside of ceiling
 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.
Check draining also when installed in heating period.
By using a pitcher or hose, pour water (0.4 to 0.5 gal
(1500 cc to 2000 cc)) into the discharge port before
installation of the ceiling panel.
Pour water gradually so that water does not spread on
the motor of the drain pump.
CAUTION CAUTION
Pour water gently so that it does not spread around
inside the indoor unit, which may cause a malfunction.
14-EN