Mitsubishi Electric FDT125VNVF Technical Manual page 225

⑦Drain pipe (continued)
2. 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.
● When installing drain pipe, use VP-20 for the pipe goes up the closest to the unit, and
VP-25 or higher number product for farther pipes.
● 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 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.
290~325mm
Drain hose
Joint for VP20 (local procurement)
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 1000 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 50mm to
supply water.
(Insert hose facing
toward bottom.)
Remove grommet
Make sure to Install
it back after test.
Outline of bottom drain piping work
● If the bottom drain piping can be done with a
descending gradient (1/50-1/100), it is possible to
connect the pipes as shown in the drawing below.
Connecting port of bottom drain pipes
Uncoupling the drain motor connector
● Uncouple the connector CNR for the drain motor
as illustrated in the drawing on the right.
(
Note: If the unit is run with the connector coupled,
drain water will be discharged from the upper drain
pipe joint, causing a water leak.
Trapped air will
No bump
generate noises.
No trap
Not touching the water
As wide as possible
(about100mm)
VP-30 or bigger
Descending slope greater than 1/100
Right overhead
Attached drain hose clamp
Pour water into a convex joint
Drain
Main
piping
unit
Drain situation can be checked with transparent socket.
If 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.
Connecting port of top drain pipe
Standard hard polyvinyl
chloride pipes
Insulating material
Rubber stopper (to be removed)
P.C. board
)
For drain motor
connector CNR (blue)
⑦Drain pipe (continued)
Drain pump operation
○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 Connec-
tor CNB is disconnected, and then the power supply (230VAC on the terminal block ① and ②) is turned ON.
Make sure to turn OFF "SW7-1" and reconnect the Connector CNB after the test.
⑧Wiring-out position and wiring connection
● Electrical installation work must be performed according to the installation manual by an
electrical installation service provider qualified by a power provider of the country, and be
executed according to the technical standards and other regulations applicable to electrical
installation in the country.
Be sure to use an exclusive circuit.
● Use specified cord, fasten the wiring to the terminal securely, and hold the cord securely in
order not to apply unexpected stress on the terminal.
● Do not put both power source line and signal line on the same route. It may cause miscommu-
nication and malfunction.
● Be sure to do D type earth work.
● For the details of electrical wiring work, see attached instruction manual for electrical wiring
work.
1. Remove a lid of the control box (2 screws).
2. Hold each wiring inside the unit and fasten them to terminal block securely.
3. Fix the wiring with clamps.
4. Install the removed parts back to original place.
Power source side Signal side
terminal block terminal block
CNS CNV CNT2 CNN CNN CNH CNH
Earth
Single unit wiring connection
⑨Check list after installation
●Check the following items after all installation work completed.
Check if
The indoor and outdoor units are fixed securely?
Inspection for leakage is done?
Insulation work is properly done?
Water is drained properly?
Supply voltage is same as mentioned in the model name plate? PCB burnt out, not working at all
There is mis-wiring or mis-connection of piping?
Earth wiring is connected properly?
Cable size comply with specified size?
Any obstacle blocks airflow on air inlet and outlet?
⑩Tap selection on blower unit (when the high peformance filter is used)
The fan tap's factory setting is "Standard." If you want to change it to the high static-pressure setting,
you can avail yourself of the following two methods. Use one of the two methods to set the fan tap.
Make sure to perform the functional setting with remote controller.
Select [I/U FUNCTION] in the functional setting mode, and change the function number [02]
[FAN SPEED SET].
For operation method, refer to the user's manual of the remote controller.
Function number A Functional content B Setting content C Default setting
02 Fan Speed Set
Standard Tap
Static
Pressure
High Speed 1 Tap
If the external static pressure is 60Pa or less, do not set the fan speed to High speed 1.
If High speed 1 setting is done, air outlet speed from indoor unit will increase and
waterdrop may be blown out and wet the ceiling or the furniture.
224
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'12 • PAC-T-174
Signal side
Power source side
terminal block
terminal block
Earth
(Shielded cord)
CNZ
Remote
CNS CNV CNT2 CNN CNH CNZ
controller line
Inner/outer
connecting line
Indoor power source line
Clamp for wiring at site
Earth
Clamp for wiring at site
Multi unit wiring connection
Expected trouble
Falling, vibration, noise
Insufficient capacity
Water leakage
Water leakage
PCB burnt out, not working at all
Electric shock
PCB burnt out, not working at all
Insufficient capacity
Standard ○
High Speed 1
UNIT: Pa
60
130
CAUTION
Superlynk line
(Shielded cord)
Remote
controller line
Check