Drain Piping Work - Toshiba Super MMU-AP0092H Service 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 droping.
Inappropriate piping work may result in water
leakage in the room and wet of furniture.
n Piping/Heat insulating material
Require the following materials for piping and heat
insulating at site.
Hard vinyl chloride pipe VP25
Piping
(Outer dia. : Ø32mm)
Foam polyethylene :
Heat insulator
Thickness 10mm or more
REQUIREMENT
• Be sure to perform heat insulation of the drain pipes of the indoor unit.
• Never forget to perform heat insulation of the connecting part with the indoor unit.
An incomplete heat insulation causes dew droping.
• 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 20m or less.
In case of a long pipe, provide support brackets with interval
of 1.5 to 2m in order to prevent waving.
• Set the collective piping as shown in the below figure.
• Be sure not to 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,
be sure to use/fix the attached flexible hose with the hose band,
otherwise a damage or water leak is caused on the drain pipe connecting port.
Drain pipe connecting port VP25 vinyl chloride pipe
(Hard socket) (To be local procure)
Attached hose band
Attached flexible hose
Soft socket Socket for VP25
(To be local procure)
Hard socket
Adhesive inhibited :
Use the attached flexible hose and hose band for connecting the drain hose to the clear drain socket.
If applying the adhesive, socket will be damaged and cause water leakage.
n 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.
• Be sure to 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
1.5m to 2m
Support bracke
1/100 or
Heat insulator
more downward
Arched
NO
shape
GOOD
Trap
As long as possible (10cm)
VP25 VP25
VP25
VP30 or more
Downward slope
1/100 or more
Align the attached hose band to the end of hose,
set the tightening position upward, and then tighten it.
Drain pipe connecting port
VP25 vinyl chloride pipe
(Transparent)
(To be local procure)
Flexible hose
(Accessory)
Socket for VP25 vinyl chloride pipe
(To be local procure)
n Connecting drain pipe
• Connect a hard socket (procured locally) to
the hard socket of the attached supplied
flexible hose.
• Connect a drain pipe (procured locally) 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.
n 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 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 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.
300mm or less
Indoor unit
Underside of ceiling
n 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.
Be sure to check draining also when installed in
heating period.
Using a pitcher or hose, pour water
(1500 to 2000cc) 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.
Heat exchanger
Float switch
connector (3P)
(CN34: red)
Drain pan
Power supply
wiring
Tool for
S
Pouring water
R
Insert the hose end between
the heat exchanger and the drain pan,
Bottle and then bend the hose downward.
Water (1500cc to 2000cc)
• After the electric work has finished, pour water
during COOL mode operation.
• If the electric work has not yet finished, pull out
the float switch connector (CN34 : Red) from the
electric parts box, and check draining by plugging
the single phase 220–240V power to the terminal
blocks R(L) and S(N).
If doing so, the drain pump motor operates.
(Never apply 220-240 V to , , or
A
U U B
1 2
otherwise a trouble of P .C. board occurs.)
,