Mitsubishi Heavy Industries FDC112KXEN6 Technical Manual page 212

w Prepare a joint for connecting VP-20 pipe, adhere and connect the joint to the drain hose (the end made of rigid PVC), and
adhere and connect VP-20 pipe (prepare on site).
* As for drain pipe, apply VP-20 made of rigid PVC which is on the market.
a) 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.
b) 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.
e Make sure to make descending slope of greater than 1/100 and do not make up-down bend and/or trap in the midway.
a) 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.
b) Do not set up air vent.
1.5m~2m
nsulation material
Descending slope greater than 1/100
c) 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 VP-30 or bigger size for
main drain pipe.
r 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.
* After drainage test implementation, cover the drain socket part with pipe cover (small size), then use the pipe cover (big
size) to cover the pipe cover (small size), clamps and part of the drain hose, and fix and wrap it with tapes to wrap and
make joint part gapless.
Drain up
● 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.
Otherwise, the construction point makes it same as drain pipe construction.
Drain test
q Conduct a drain test after completion of the electrical work.
w During the trail, make sure that drain flows properly through the piping and that no water leaks from connections.
e In case of a new building, conduct the test before it is furnished with the ceiling.
r Be sure to conduct this test even when the unit is installed in the heating season.
Supporting metal
Air vent
90 ~ 3 5mm
Drain hose
Joint for VP 0 (local procurement)
208
- -
Trapped air will
No bump
generate noises.
No trap
Not touching the water
As wide as possible
(about100mm)
VP-30 or bigger
escending slope greater than 1/100
Right overhead