Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 52

⑥Drain pipe (continued)
●When sharing a drain pipe for more than 1
unit, lay the main pipe 100mm below the
drain outlet of the unit. In addition, select
VP30 or bigger size for main drain pipe.
6. 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
850mm above the ceiling. Use elbows for installa-
tion to avoid obstacles inside ceiling. If the horizon-
tal 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.
Drain test
● After installing the drain pipe, make sure that drain system works correctly and that no water leaks
from the joint and drain pan. Check whether the motor sound of the drain pump is normal.
● Conduct a drain test when installing, even during the heating season.
● In the case of new buildings, be sure to complete the test before fixing the ceiling.
1. Pour about 1,000 cc of test water into the drain pan of the indoor unit. Exercise care not to
allow electrical equipment such as the drain pump and other components to become wet
while filling water.
Pour test water through the pouring port of the pipe lid using a feed water pump or a similar
device, or through the refrigerant pipe joint.
●In case of pouring water from the air outlet
●In case of pouring water from the pouring port of the pipe lid
2. Make sure that water drains out completely and that no water leaks from any joints of the
drain pipe during the test.
Test to confirm that the water drains out correctly while listening to the drain pump motor operating sound.
At the drain socket (transparent), it is possible to check whether the water drains out correctly.
3. Unplug the rubber plug on the indoor unit so that the remaining water drains from the drain
pan after the draining test.
After checking the water drainage, fix the rubber plug correctly. Installation work for the drain
pipe must be performed for the entire drain pipe up to the indoor unit.
If the pipe lid has been removed in order to pour water, mount the pipe lid again.
Drain pump operation
●In case electrical wiring work completed
Drain pump can be operated by the wired remote control.
For the operation method, refer to Operation for drain pump in the installation manual for wiring work.
●In case electrical wiring work not completed
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 source (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.
⑦Wiring-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 miscommuni-
cation 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. Loosen the 2 screws of the lid of the control box, and slide the lid in the direction of the arrow
shown in the figure. It will then be possible to open the lid.
2. Unhook the lid from the control box,
and remove the lid.
3. Remove the 2 screws from the wiring
cover, and remove the wiring cover.
4. Hold each wire inside the unit, and securely
fasten them to the terminal block.
5. Fix the wiring using clamps.
Screws
6. Install the wiring cover and the lid of
the control box.
Main fuse specification
Specification Part No.
Lid of the
control box
T3.15A L250V SSA564A149AF
As wide as possible
(about100mm)
VP30 or bigger
Descending slope greater than 1/100
215 to 245mm 100 or less
Drain hose
Joint for VP25
(Prepare on site)
Pipe lid
Pouring port
Grommet
When opening the lid of the control box When closing the lid of the control box
Hook the
Wiring cover
claws to the
control box.
Screws
Slide the lid
Hook of the lid
and hook the
Loosen the 2
hole onto the
screws, and
screw head.
slide the lid to
open it.
Hook of the lid
⑦Wiring-out position and wiring connection (continued)
Wiring between indoor
Single Split (PAC) series
and outdoor units
Band
Earth
Power source
side terminal
block
Signal side
terminal block
Main fuse
⑧Panel installation
●Install the panel on the indoor unit after electrical wiring work.
●Refer to the attached manual for panel installation for details.
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?
Power source 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?
⑩How to check the dirt of drain pan and cleanimg the inlet of the drain pump. (Maintenance)
The method of checking the dirt of drain pan
●It is possible to check dirt on the drain pan and drain pump inlet without removing the panel.
1. Open the inlet grille and remove the corner lid on the drain pan side.
2. Remove the drain cap cover (1 screw) from the panel corner.
3. Check the dirt on the drain pan from the drain cap, and check the drain pump inlet. If the
drain pan is very dirty, remove the drain pan and clean it.
4. After checking, refix the drain cap cover securely.
If the cover is not refixed correctly, it may cause condensation to form and/or water to leak.
Corner
lid
Cleaning of drain pump inlet
●It is possible to clean the drain pump inlet and surrounding area by removing the drain cap only; it
is not necessary to remove the panel and drain pan.
●Before removing the drain cap, remove the rubber plug and drain water from the drain pan.
1. Remove the drain cap cover as described above.
2. Insert the nose of the pliers into the concave portions (2 places) of the drain cap, and rotate the pliers
about 1 turn in the CCW direction. The drain cap is removed.
3. When cleaning the drain pump inlet, use a soft plastic tool. If a metallic tool is used, the
drain cap mounting portion may be scratched and water may leak.
4. Before mounting the drain cap, rinse it and remove any foreign material from the inside of the
cap. If the drain cap is installed with foreign material inside it, it may cause water to leak.
5. Insert the nose of the pliers into the concave portions of the drain cap and rotate the pliers to install the
drain cap. Rotate the drain cap about 1 turn in the CW direction until it stops rotating. If the drain cap is
not rotated for 1 or more turns, the cap will not have been installed correctly.
Remove the drain cap, and then install it again correctly.
6. After tightening the drain cap, make sure the triangle () mark of the drain cap comes close to the triangle mark
on the panel. If these triangle marks are not close to each other, tighten the drain cap further.
7. Refix the drain cap cover and rubber plug securely. If the cover is not refixed correctly, it
may cause condensation to form and/or water to leak.
Insert the nose of the pliers into the concave
Rubber plug
portions, and rotate the drain cap.
Drain cap cover Drain cap
Notes for removing the drain pan
●Before removing the drain pan, drain water from the drain pan. Remove the rubber plug and drain water.
●The drain pan is installed by the temporary installation plate. Remove the 2 drain pan fixing screws, and
loosen the 2 screws of the temporary installation plate.
Slide the temporary installation plate to the outside of the drain pan. And then,it is possible to remove the drain pan.
●When reinstalling the drain pan, slide the temporary installation plate to the inside and temporarily fix the drain pan. Then, tighten the 2
drain pan fixing screws and the 2 screws of the temporary installation plate. Also, refix the rubber plug securely.
Temporary
jinstallation
plate of the
drain pan
Remove the
screws.
51
- -
'19 • PAC-T-327
Indoor power
VRF (KX) series
source line
Band
Earth
Remote
control line
Band
Power source
side terminal
block
Signal side
terminal block
Main fuse
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
Drain
Drain
cap
cap
cover
Drain pan
Drain pump
Drain pump inlet
Exercise care not to scratch the end, inside, or
Triangle () mark of the panel
threads of the drain cap seal.
Tighten the drain cap so that the 2 triangle
marks come close to each other.
Loosen the
screws.
Super link line
Remote
control line
Band
Check
Drain
pump
inlet
Triangle () mark of
the drain cap
Slide the plate
to the outside.