Mitsubishi Heavy Industries FDTC50ZHXV Technical Manual page 220

● 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.
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.
* 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.
Procedures
q Supply about 1000 cc of water to the unit through the air outlet by using a feed water pump.
w Check the drain while cooling operation.
for 20mm ~ 30mm to
supply water.
( nsert hose facing
toward bottom.)
Remove grommet
Make sure to nstall
it back after test.
90 ~ 3 5mm
Drain hose
Joint for VP 0 (local procurement)
nsert water supply hose
Main
unit
Drain situation can be checked with transparent socket.
f the electrical work has not been completed, connect a convex
joint in the drain pipe connection to provide a water inlet.
Then, check if water leaks from the piping system and that
drain flows through the drain pipe normally.
As wide as possible
(about100mm)
escending slope greater than 1/100
Right overhead
Attached drain hose clamp
Pour water into a convex joint
Drain
piping
212
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VP-30 or bigger