Mitsubishi Heavy Industries FDTC40ZHXV Technical Manual page 190

3) Care must be taken so as not to allow an adhesive to run into the drain hose. When
it is hardened, it can cause a breakage of a flexible part, if the flexible part receives
stress.
4) Use VP-20 general-purpose hard PVC pipes for drain piping.
5) Insert the drain hose supplied as an accessory (soft PVC end) to the stepped part
of the unit's drain socket and then fasten it with the clamp also supplied as an ac-
cessory.
6) Adhesive must not be used.
a) Glue a VP-20 joint (to be procured locally) to joint it with the drain hose (hard
PVC end) and then glue a VP-20 (to be procured locally) to the joint.
b) Give the drain piping a descending grade (1/50-1/100) and never create a
bump to go over or a trap.
c) In connecting drain pipes, care must be taken so as not to apply force to the
unit side piping and fix the pipe at a point as close to the unit as possible.
d) Do not create an air vent under any circumstances.
e) When drain piping is implemented for more than one unit, provide a collect-
ing main about 100 mm below the units' drain outlets from which it collects
drain. Use a VP-30 or larger pipe for a collecting main.
f) Do not fail to provide heat insulation at the following two points because they
can cause dew condensation and a resultant water leak.
7) Drain socket
After a drain test is completed, apply a pipe cover (small: accessory) onto the drain
socket, cover the pipe cover (small), the clamp and part of the drain hose with a
pipe cover (large: accessory) and wrap it with a tape completely without leaving
any gaps.
(Cut pipe covers into appropriate shapes)
8) Hard PVC pipes laid indoor
a) Since a drain pipe outlet can be raised up to 600 mm from the ceiling, use
elbows, etc. to install drain pipes, it there are obstacles preventing normal drain
pipe arrangement. When the drain pipe is raised at a point far from a unit, it
can cause an overflow due to a back flow of drain upon stoppage, so arrange
piping to keep the dimensions specified in the illustration shown on the left.
b) Install the drain pipe outlet where no odor is likely to be generated.
c) Do not lead the drain pipe into a ditch where the generation of harmful gas
such as sulfuric gas or flammable gas is expected. A failure to observe this
instruction may cause such harmful or flammable gas to flow into the room.
1
Check that water is draining thoroghly during test run, and that there are no water leaks from the joints and the drain pan.
2
The test has to be performed even if the unit is installed in the season when the unit is used for healting.
3
In a new house, perform the test before the ceiling is fitted.
• Using a water pump, pour about 1000 cc of water to the drain pan through the
blowing outlet.
• Check the transparent drain-out section of the drain hose for normal flow of
drainage.
* While observing the noise from the drain motor, test drain operation.
• Take off the drain plug to release the water. After the water is drained, place
the drain pulg back where it was..
* Be careful not to get splashed when pulling the drain plug.
In case electrical wiring work finished
Drain pump can be operated by remote controller (wired).
For the operation method, refer to Operation for drain pump in the installation manual for wiring work.
In case electrical wiring work not finished
Drain pump will run continuously when the dip switch "SW7-1" on the indoor unit PCB is turned ON, the Connector CNB
is disconnected, and then the power supply (230VAC on the terminal block
Make sure to turn OFF "SW7-1" and reconnect the Connector CNB after the test.
and ) is turned ON.
183
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Suspension
1.5 m ~ 2 m
bolts
Insulation Descending slope
material greater than 1/100
Air vent
Trapped air will
generate noises.
As wide as possible
(about 100 mm)
Descending slope
VP30
greater than 1/100
295 ~ 325 mm 100 mm or less
Drain hose
Joint for VP-20
(not included)
Put the tip of the feed water pump
in the drain pan of the unit body
Drain plug
No bump
No trap
Not
touching
the water