Mitsubishi Heavy Industries FDT200VSAWPVH Service Manual page 149

⑧Drain pipe
Caution
● Install the drain pipe according to the installation manual in order to drain properly.
Imperfection in draining may cause flood indoors and wetting the household goods, etc.
Do not put the drain pipe directly into the ditch where toxic gas such as sulfur, the other harmful and
●
inflammable gas is generated. Toxic gas would flow into the room and it would cause serious
damage to user's health and safety (some poisoning or deficiency of oxygen). In addition, it may
cause corrosion of heat exchanger and bad smell.
● Connect the pipe securely to avoid water leakage from the joint.
● Insulate the pipe properly to avoid condensation drop.
● Check if the water can flow out properly from both the drain outlet on the indoor unit and the end of
the drain pipe after installation.
● Make sure to make descending slope of greater than 1/100 and do not make up-down bend and/or trap
in the midway. In addition, do not put air vent on the drain pipe. Check if water is drained out properly from
the pipe during commissioning. Also, keep sufficient space for inspection and maintenance.
Work procedure
1. Insert the supplied drain hose (the end made of soft PVC) to the step of the drain socket on
the indoor unit and fix it securely with the clamp.
●Do not apply adhesives on this end.
Hose clamp
(Accessory)
Indoor Unit
Pipe cover
(For insulation)
VP25
(Prepare on site)
○The cases of FDUA and mouting a Drain-up KIT (optional parts)
Make sure to insert the drain hose (the end mode of soft PVC) to the end of the step part
of drain socket.
Attach the hose clamp to the drain hose around 10mm from the end, and fasten the
screw about 5mm left to the nut.
●Do not apply adhesives on this end.
●Do not use acetone-based adhesives to connect to the drain socket.
Stage difflernce part
Drain socket
Drain hose
Fasten the screw about
5 mm left to the nut.
Drain hose
Hose clamp
Drain socket
10mm
Metal plate
2. Prepare a joint for connecting VP25 pipe, adhere and connect the joint to the drain hose (the
end made of rigid PVC), and adhere and connect VP25 pipe (prepare on site).
※As for drain pipe, apply VP25 made of rigid PVC which is on the market.
● Make sure that the adhesive will not get into the supplied drain hose.
It may cause the flexible part broken after the adhesive is dried up and gets rigid.
● The flexible drain hose is intended to absorb a small difference at installation of the unit or
drain pipes. Intentional bending, expanding may cause the flexible hose broken and water
leakage.
3. Make sure to make descending slope of greater than 1/100 and do not make up-down bend
and/or trap in the midway.
●Pay attention not to give stress on the pipe on the indoor unit side, and support and fix the
pipe as close place to the unit as possible when connecting the drain pipe.
●Do not set up air vent.
Supporting metal
1.5m~2m
Air vent
Insulation material
Descending slope greater than 1/100
●When sharing a drain pipe for more than
one unit, lay the main pipe 100mm
below the drain outlet of the unit. In
addition, select VP30 or bigger size for
main drain pipe.
VP25
(Propare on site)
Drain soket
(Prepare on site)
VP25 joint (Prepare on site)
Unit
VP25
Drain hose
Adhesion
(Prepare on site)
(Accessory)
Drain socket
Clamp (Accessory)
Pipe cover (small)
(For insulation)
(Prepare on site)
Trapped air will
No bump
generate noises.
No trap
Not touching the water
As wide as possible
(about100mm)
VP30 or bigger
Descending slope greater than 1/100
⑧Drain pipe (continued)
4. Insulate the drain pipe.
● Be sure to insulate the drain socket and rigid PVC pipe installed indoors otherwise it may
cause dew condensation and water leakage.
Drain up
○The cases of FDUA and mounting a drain-up KIT (optional parts)
● The position for drain pipe outlet can be raised up to 600mm above the ceiling. Use
elbows for installation to avoid obstacles inside ceiling. If the horizontal drain pipe is too
long before vertical pipe, the backflow of water will increase when the unit is stopped,
and it may cause overflow of water from the drain pan on the indoor unit. In order to
avoid overflow, keep the horizontal pipe length and offset of the pipe within the limit
shown in the figure below.
295-325
Otherwise, the construction point makes it same as drain pipe construction.
Drain test
1. Conduct a drain test after completion of the electrical work.
2. During the trail, make sure that drain flows properly through the piping and that no water
leaks from connections.
3. In case of a new building, conduct the test before it is furnished with the ceiling.
4. Be sure to conduct this test even when the unit is installed in the heating season.
Procedures
1. Supply about 2000 cc of water to the unit through the air outlet by using a feed water
pump.
2. Check the drain while cooling operation.
Insert water supply hose
for 20mm – 30mm to
supply water.
(Insert hose facing
toward bottom.)
Remove grommet
Make sure to Install
it back after test.
148
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'21 • PAC-SM-383
100 or less