Drain Piping Work - Toshiba MMD-AP0071SH-C 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.
Inappropriate piping work may result in
water leakage in the room and wet of
furniture.
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 dewing.
• 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 right figure.
• Do not mount an air purge pipe,
otherwise drain water spouts
(Collective pipes)
out resulted in water leak.
• 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 fix the attached
flexible hose.
• 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.
Connection of flexible hose
• Insert the soft socket of the attached flexible hose into the connecting port of the drain pipe until it strikes against
the end.
• Align the attached hose band to the end of the pipe connecting port, and then tighten it surely.
REQUIREMENT
• Be sure to fix the soft socket with the
attached hose band and set the
tightening position at upper side.
• Use the attached flexible hose by
bending it with 45° or less so that no
breakage or clogging occurs.
Pipe material/Insulator and size
The following materials for piping work and insulating
process are procured locally.
Hard vinyl chloride pipe socket for VP25
Pipe material
Hard vinyl chloride pipe VP25
(Nominal outer diameter Ø32mm)
Foamed polyethylene foam, thickness:
Insulator
10mm or more
1.5m to 2m
Support
bracket
Heat
1/100 or more
insulator
downward
Arched
NO
shape
GOOD
Trap
As long as possible (100mm or more)
VP25
VP25 VP25
VP30 or more
Downward slope
1/100 or more
Drain pipe connecting port Ø25 vinyl chloride pipe
(Hard socket)
(Local supply)
Align the attached hose band to the
end of hose, set the tightening
position upward, and then tighten it.
Soft socket Hard socket Socket for VP25
(Local supply)
Adhesive agent prohibited
OK NO GOOD
Top view
Side view
Air outlet
max
Riser (Trap)
45˚
Side view Side view
Air outlet max Air outlet
45˚
90˚ Bend
Connection of drain pipe
• Connect the hard socket (local supply) to the hard
socket side of the attached flexible hose which has
been installed.
• Connect the drain pipes (local supply) successively
to the connected the hard socket.
REQUIREMENT
• Using adhesive agent for vinyl chloride, connect
the hard vinyl chloride pipes certainly so that
water does not leak.
• It requires several times to dry and harden the
adhesive agent.
(Refer to Guide Manual of the adhesive agent.)
In this time, be sure not to apply force to the
connecting section with the drain pipes.
Drain up
When a downward grading cannot be secured on the
drain pipe, a drain-up work is possible.
• Set the height of the drain pipe within 850mm from
the bottom surface of the indoor unit.
• Draw out the drain pipe within 300mm from the end
of the drain pipe connecting port of the indoor unit,
and then raise it vertically.
• After the drain pipe has been raised, set a grading
so that it is immediately bent downward.
300mm
or less
Indoor unit
Underneath of ceiling
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.
When the electric work has finished:
• Pour water as shown in the following figure, check
water is drained from the drain pipe connecting port
in COOL mode, and then check there is no water
leak from the drain pipes.
When the electric work has not finished:
• Pull out the float switch connector (3P: Red) from
P.C. board connector (CN34: Red) of the electric
parts box. (In this time, be sure to check the power
is turned off.)
• Connect the single-phase 220-240V 50Hz (or 220V
60Hz) power to the terminal blocks R (L) and S (N).
(Never apply 220-240V to (A), (B), (U1),and (U2),
otherwise a trouble of P.C. board occurs.)
• Pour water referring to the figure.
(Amount: 1500cc to 2000cc)
• When the power is turned on, the drain pump motor
drives automatically.
Check water is drained from the drain pipe
connecting port, and then check there is no water
leak from the drain pipes.
• After check of draining and water leak, turn off the
power supply, attach the float switch connector to
the original position (CN34) of P.C. board, and then
set the electric parts box as before.
~
220–240V , 50Hz
~
220V , 60Hz
R(L) S(N)
White
CN34 Red
(RED)
Black
Pull out connector CN34 (Red) from P.C. board.
Black