Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 180

⑦Drain pipe
Caution
● Install the drain pipe according to the installation manual in order to drain properly.
Imperfection in draining may cause flood indoors and wetting the household goods， etc.
●
Do not put the drain pipe directly into the ditch where toxic gas such as sulfur, the other harmful and
inflammable gas is generated. Toxic gas would flow into the room and it would cause serious
damage to user's health and safety (some poisoning or deficiency of oxygen). In addition, it may
cause corrosion of heat exchanger and bad smell.
● Connect the pipe securely to avoid water leakage from the joint.
● Insulate the pipe properly to avoid condensation drop.
● Check if the water can flow out properly from both the drain outlet on the indoor unit and the end
of the drain pipe after installation.
● Make sure to make descending slope of greater than 1/100 and do not make up-down bend and/or trap
in the midway. In addition, do not put air vent on the drain pipe. Check if water is drained out properly
from the pipe during commissioning. Also, keep sufficient space for inspection and maintenance.
Work procedure
1. Connect the drain pipe (VP-20) to drain socket using "transparent soft tube (accessory)" and
secure firmly with a clamp.
● Do not apply adhesives on both side.
{*1 If the drain tube is directly connected with drain socket, the drain socket and drain pan
would not be able to be removed.}
{*2 As optional setting, rubber hose (inside diameter 19) can be connected directly with clamp
to above drain socket under the later condition.}
Transparent soft tube
(Accessory)
Drain socket
Clamp (Accessory)
2. 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.
3. 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 test
● After installation of drain pipe, make sure that drain system work in good condition and no
water leakage from joint and drain pan.
● Do drain test even if installation of heating season.
● For new building cases, make sure to complete the test before hanging the ceiling.
1. Remove the drain grommet, and pour water of about 1000cc into the drain pan in the
indoor unit by pump so as not to get the electrical component wet.
2. Make sure that water is drained out properly and there is no water leakage from any joints
of the drain pipe at the test.
3. Make sure to install the grommet back to original
place.
4. Insulate the drain pipe properly finally.
Pipe cover for insulation {t10}
(Prepare on site)
VP-20 (Prepare on site)
Trapped air will
generate noises.
No bump
No trap
Not touching the water
As wide as possible
(about100mm)
VP-30 or bigger
Descending slope greater than 1/100
Pump
Remove grommet
Make sure to install
it back after test.
Insert the edge of water pump
hose in the drain pan.
177
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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 miscom-
munication 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.
Signal side terminal block
Power source
side terminal
block
Indoor power source line
Earth
> Procedure for optional setting of control box
(i) Remove bottom plate.
(ii) Unfasten two (2) "straps" for wire.
(iii) Remove the plate for control box. (2 screws), and set it at optional position (oposite side).
(iv) Remove the control box (2 screws), and set it at optional position (oposite side).
(v) Cut insulation of "U" shape space.
Through this cutting, set and fix all wires by four (4) "clamps" and two (2) "straps".
(vi) Close the previous "U" shape wiring space by insulation, and set the bottom plate again.
① Wiring Location (Original)
② Wiring Location (Optional)
After fix ○, the modification of wiring length should be done, by ○
The previous
"U" shape space
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?
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?
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Earth (Signal line)
Signal line
(Shielded cord)
Remote
controller line
Earth
Indoor power
source line
Clamp
"U" shape space
Expected trouble Check
Falling, vibration, noise
Insufficient capacity
Water leakage
Water leakage
PCB burnt out, not working at all
PCB burnt out, not working at all
Electric shock
PCB burnt out, not working at all
Insufficient capacity
PJC012D200
A