Mitsubishi Heavy Industries FDE112KXE6A, Service Manual

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 177 

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⑦

Drain pipe

⑥

Refrigerant pipe

Caution

●

Use the new refrigerant pipe.

When re-using the existing pipe system for R22 or R407C, pay attention to the following items.

・

Change the flare nuts with the attached ones (JIS category 2), and reprocess the flare parts.

・

Do not use thin-walled pipes.

●

Use phosphorus deoxidized copper alloy seamless pipe (C1220T specified in JIS H3300) for 

refrigeration pipe installation.

In addition, make sure there is no damage both inside and outside of the pipe, and no harmful 

substances such as sulfur, oxide, dust or a contaminant stuck on the pipes. 

●

Do not use any refrigerant other than R410A.

Using other refrigerant except R410A (R22 etc.) may degrade inside refrigeration oil. And air 

getting into refrigeration circuit may cause over-pressure and resultant it may result in bursting, 

etc.

●

Store the copper pipes indoors and seal the both end of them until they are brazed in order to 

avoid any dust, dirt or water getting into pipe. Otherwise it will cause degradation of refrigeration 

oil and compressor breakdown, etc.

●

Use special tools for R410 refrigerant.

Work procedure 
1.  Remove the flare nut and blind flanges on the pipe of the indoor unit.

※ 

Make sure to loosen the flare nut with holding the nut on pipe side with a spanner and giving 

torque to the nut with another spanner in order to avoid unexpected stress to the copper pipe, and 
then remove them.

(Gas may come out at this time, but it is not abnormal.)

● 

Pay attention whether the flare nut pops out. (as the indoor unit is sometimes pressured.)

2.  Make a flare on liquid pipe and gas pipe, and connect the refrigeration pipes on the indoor unit.
 

※

Bend  the  pipe  with  as  big  radius  as  possible  and  do  not  bend  the  pipe  repeatedly.  In 

addition, do not twist and crush the pipes.

※

Do a flare connection as follows:

● 

Make sure to loosen the flare nut with holding the nut on pipe side with a spanner and giving 

torque to the nut with another spanner in order to avoid unexpected stress to the copper 
pipe, and then remove them.

● 

When fastening the flare nut, align the refrigeration pipe with the center of flare nut, screw 

the  nut  for  3-4  times  by  hand  and  then  tighten  it  by  spanner  with  the  specified  torque 
mentioned in the table below. Make sure to hold the pipe on the indoor unit securely by a 
spanner when tightening the nut in order to avoid unexpected stress on the copper pipe.

3.  Cover the flare connection part of the indoor unit with attached insulation material after a gas 

leakage inspection, and tighten both ends with attached straps.

●

Make sure to insulate both gas pipes and liquid pipes completely.

※ 

Incomplete insulation may cause dew condensation or water dropping. 

4.  Refrigerant is charged in the outdoor unit.
  As for the additional refrigerant charge for the indoor unit and piping, refer to the installation 

manual attached to the outdoor unit.

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.

Pipe diameter

Tightening torque N·m

φ

 6.35

φ

 9.52

φ

 12.7

φ

 15.88

φ

 19.05

14 to 18
34 to 42
49 to 61
68 to 82

100 to 120

Strap (Accessory)

Pipe cover (Accessory)

The thickness of insulation should be 20mm or more.

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 

F

19) can be connected directly with clamp 

  to above drain socket under the later condition.}

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.

●

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.

Descending slope greater than 1/100

VP-30 or bigger

As wide as possible 

(about100mm)

⑧

Wiring-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.

Power source 

side terminal 

block

Earth (Signal line)

Signal line 

(Shielded cord)

Remote 

controller line

Earth

Indoor power source line

Clamp

Earth

Indoor power 

source line

Signal side terminal block

⑨

Check list after installation

●

Check the following items after all installation work completed.

Check if;

Expected trouble

Check 

The indoor and outdoor units are fixed securely?

Falling, vibration, noise

Inspection for leakage is done?

Insufficient capacity

Insulation work is properly done?

Water leakage

Water is drained properly?

Water leakage

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?

PCB burnt out, not working at all

Earth wiring is connected properly?

Electric shock

Cable size comply with specified size?

PCB burnt out, not working at all

Any obstacle blocks airflow on air inlet and outlet?

Insufficient capacity

Drain socket

Pipe cover for insulation {t10}

(Prepare on site)

Transparent soft tube

(Accessory)

VP-20 (Prepare on site)

Clamp (Accessory)

Supporting metal

No bump

No trap  

Not touching the water

Trapped air will 

generate noises.

Air vent

Insulation material  

1.5m ~ 2m

⑤

Duct work

Request

①

●

Calculate air capacity and the outside static pressure to select the 

duct’s length

and shape, and blow outlet.

Caution

●

Take care that the outside static pressure does not exceed 30 Pa.
The unit has condensation owing to the decrease in air capacity, 
possibly causing the ceiling and household goods to become wet.

②

The main body of the air conditioner is not provided with an air filter.
Assemble it into the suction grill for which cleaning is easy.

③

Blow duct

●

Make the duct the shortest in length.

●

Bend a lot less abruptly. (Make the bend radius a lot larger.)    

●

When connecting the main body to the duct flange of the blow outlet, attach the insulation 
material to the fixed portion to protect it from condensation.

●

Conduct the duct work before ceiling attachment. 

④

 Inlet port

●

When placing the inlet port to carry out suction from the bottom side, use the following proce-

dure to replace the suction duct joint (prepare on site) and the bottom plate.

●

Remove the screws which fasten the   

●

Replace the removed bottom plate 

  bottom plate and the duct joint (prepare    

    and duct joint (prepare on site).

  on site) on the inlet port side of the unit.

  ●

Fit the duct join (prepare on site) with a screw; 

  fit the bottom plate. 

⑤

 Make sure to keep the suction duct warm to protect it from condensation.

⑥

 Install the blowout hole where air can flow all over the room.

⑦

 Make sure to install the inspection opening in the ceiling. It is needed for the maintenance of 
electrical parts, the motor and other parts.

Descending slope greater than 1/100

“U” shape space

The previous 

“U” shape space

Air conditioner main unit

Ceiling suriace

Suction hole

(marketed item)

(with air filter)

Inspection hole

Suction duct

(marketed item)

Blow outlet

Blowout duct

(optional or marketed item)

⑤

Duct work (continued)

Example of bad duct work

①

If the suction duct is made in the ceiling without using the suction side duct, the temperature 
inside the ceiling will be high owing to the ventilating fan’s performance, the strength of any 
wind blowing against the outdoor air louver, weather (on a rainy day) and other factors.

●

The outside plate of the unit may have condensation, causing water to drip on the ceiling. 
Also,  in  the  case  of a  new house  of a concrete  structure,  the  temperature  may  be  high 
without a duct inside the ceiling. In such a case, keep the whole unit warm using glass wool 
(25mm). (Cover the glass wool with wire netting or the like.)

●

The unit may be beyond its operation limit, causing overloading of the compressor, and other 
trouble.

●

Because the blowing capacity of the unit increases, owing to the ventilating fan’s perfor-
mance and any wind blowing against the outdoor air louver, up to its use limit, draining liquid 
from the heat exchanger does not flow into the drain pan, possibly flowing to the outside and 
causing water leaks (in which drained liquid drips on the ceiling).

Bad example of duct work

For ventilation

Louver to

outdoor air

④

Installation of indoor unit (continued)

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> 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.

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.

0*#$

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.

Pump

Remove grommet

Make sure to install 

it back after test.

Insert the edge of water pump 

hose in the drain pan.

Caution

●

Do not adjust the height by adjusting upper nuts. It will cause unexpected stress on the indoor 
unit and it will lead to deformation of the unit, failure of attaching a panel, and generating noise 
from the fan.

●

Make sure to install the indoor unit horizontally and set the gap between the unit underside and 
the  ceiling  plane  properly.  Improper  installation  may  cause  air  leakage,  dew  condensation, 
water leakage and noise.

3.  Make sure to install the indoor unit horizontally. Confirm the 

levelness of the indoor unit with a level gauge or transpar-
ent  hose  filled  with  water.  Keep  the  height  difference  at 
both ends of the indoor unit within 3mm.

4.  Tighten four upper nuts and fix the unit after height and 

levelness adjustment.

Indoor unit

hose

!

 /Ê "8

① 

Wiring Location (Original)

②

Wiring Location (Optional)

      After fix 

○

, the modification of wiring length should be done, by

○

A

PJC012D200