Drain Piping Work - Toshiba Carrier MMU-AP0071MH2UL Installation Manual

5

Drain piping work

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 VP25
Piping
(Outer dia.: Ø1.3" (32 mm))
Foam polyethylene:
Heat insulator
Thickness 0.4" (10 mm) or more
 Flexible hose
Use the attached flexible hose to adjust center
discrepancy of the hard vinyl chloride pipe or to adjust
the angle.
• Do not use the flexible hose as stretched, or do not
deform it more extent than that in the following figure.
• Fix the soft end of the flexible hose with the attached
hose band.
• Use the flexible hose on a horizontal level.
OK NO GOOD
Riser (Trap)
Max
45°
Max
45°
90° Bend
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 65'7"
(20 m) or less.
In case of a long pipe, provide support brackets with
interval of 4'11" - 6'7" (1.5 - 2 m) in order to prevent
waving.
4'11" - 6'7" (1.5 - 2 m) Support
bracket
1/100 or more
Heat insulator
downward
Arched
NO
shape
GOOD
Trap
• Set the collective piping as shown in the below figure.
As long as possible (3.9" (100 mm))
VP25 VP25 VP25
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
VP25 vinyl chloride
connecting of hose, set the
pipe
port
tightening position
(Locally procured)
upward, and then
tighten it.
Hard socket
Socket for VP25
Soft socket
(Locally procured)
Adhesive agent
prohibited
• Adhesive agent cannot be used for the pipe
connecting port (hard 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.
15 mm or less
Flexible
drain hose
Indoor unit
Hose band
10 mm
 Connecting drain pipe
• Connect a hard socket (locally procured) to the hard
socket of the attached supplied flexible hose.
• Connect a drain pipe (locally procured) to the
connected hard socket.
REQUIREMENT
• Connect hard vinyl chloride pipes securely using an
adhesive for vinyl chloride to avoid water leakage.
• It takes some time until the adhesive is dried and
hardened (refer to the manual of the adhesive). Do not
apply stress to the joint with the drain pipe during this
time period.
 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 - 0.5 gal
(1500 - 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
Pour water gently so that it does not spread around
inside the indoor unit, which may cause a malfunction.
14-EN