Mitsubishi Heavy Industries FDE112KXE6A, Service Manual

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 139 

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PJA012D756

A

 Installation of indoor unit (continued)

6.  Make sure to install the indoor unit horizontally. Confi rm the 

levelness of the indoor unit with a level gauge or transparent hose 

fi lled with water. Keep the height difference at both ends of the 

indoor unit within 3mm.

7.  Tighten four upper nuts and fi x the unit after height and levelness 

adjustment.

Caution

z

  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.

z

  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.

z

  Even after decorative panel attached, still the unit height can be adjusted fi nely. Refer to the 

installation manual for decorative panel for details.

z

  Make sure there is no gap between decoration panel and ceiling surface, and between decoration 

panel and the indoor unit. The gap may cause air leakage, dew condensation and water leakage.

z

  In case decorative panel is not installed at the same time, or ceiling material is installed after the 

unit installed, put the cardboard template for installation attached on the package (packing material 

of cardboard box) on the bottom of the unit in order to avoid dust coming into the indoor unit.

 Refrigerant pipe

Caution

z

  Use the new refrigerant pipe.

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

x

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

x

Do not use thin-walled pipes.

z

  Use phosphorus deoxidized copper alloy seamless pipe (C1220T specifi ed 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. 

z

  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.

z

  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.

z

  Use special tools for R410 refrigerant.

Work procedure 

1.  Remove the fl are nut and blind fl anges on the pipe of the indoor unit.

  Make sure to loosen the fl are 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.)

z

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

2.  Make a fl are 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 fl are connection as follows:

z

  Make sure to loosen the fl are 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.

z

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

for 3-4 times by hand and then tighten it by spanner with the specifi ed 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 fl are connection part of the indoor unit with attached insulation material after a gas 

leakage inspection, and tighten both ends with attached straps.

z

  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.

Pipe diameter

Tightening torque N·m

I

 6.35

14 to 18

I

 9.52

34 to 42

I

 12.7

49 to 61

I

 15.88

68 to 82

I

 19.05

100 to 120

 Drain pipe (continued)

Work procedure

1.  Insert the supplied drain hose (the end made of soft PVC) to the step of the drain socket on 
      the indoor unit and fi x it securely with the clamp.

z

  Do not apply adhesives on this end.

Drain socket

The step part

Drain hose  

No adhesive allowed

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.

z

  Make sure that the adhesive will not get into the supplied drain hose.

  It may cause the fl exible part broken after the adhesive is dried up and gets rigid.

z

  The fl exible drain hose is intended to absorb a small difference at installation of the unit or drain 

pipes. Intentional bending, expanding may cause the fl exible 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.

z

  Pay attention not to give stress on the pipe on the indoor unit side, and support and fi x the pipe 

as close place to the unit as possible when connecting the drain pipe.

z

  Do not set up air vent.

Supporting metal

No bump

No trap  

Not touching the water

Trapped air will 

generate noises.

Air vent

Insulation material  

1.5m ~ 2m

Descending slope greater than 1/100

z

  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.

z

  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 fi x and wrap it with tapes to wrap and make joint part gapless. 

Drain up  

z

  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 backfl ow of water will increase when the unit is stopped, and it may cause overfl ow of 
water from the drain pan on the indoor unit. In order to avoid overfl ow, keep the horizontal pipe 
length and offset of the pipe within the limit shown in the fi gure below.

Drain hose

600mm or less

Joint for VP-20

(Prepare on site)

295 to 325mm

100 or less

Drain test  

z

  After installation of drain pipe, make sure that drain system work in good condition and no water 

leakage from joint and drain pan. Check if the motor sound of drain pump is normal or not.

z

  Do drain test even if installation of heating season.

z

  For new building cases, make sure to complete the test before 

hanging the ceiling.

1.  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.

  Confi rm that the water is properly drained out while the drain motor is 

operating. At the drain socket (transparent), it is possible to check if 
the water is drained out properly.

3.  Unplug the drain plug on the indoor unit to remove remaining water 

on the drain pan after the test, and re-plug it. And insulate the drain 
pipe properly fi nally.

 Drain pipe (continued)

Drain pump operation 

c

 In case electrical wiring work fi nished

  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.

c

 In case electrical wiring work not fi nished

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 (220-240VAC on the terminal block 
[

 and 

] or [   and   ] ) is turned ON.

Make sure to turn OFF “SW7-1” and reconnect the Connector CNB after the test..

 Panel installation (continued)

Work procedure

1.  Make sure that the indoor unit is positioned at the correct height with the supplied level gauge. 

Remove the level gauge before you install the panel.

2.  Screw the two bolts of the supplied four bolts by about 5mm. (

z

 mark  

) [Figure 1]

3.  Attach the supplied hook to the indoor unit with the screw (1 screw). [Figure 2]
4.  Open the air return grille.
5.  Remove the screw of a corner panel and remove a corner panel. (four places) [Figure 3]
6.  Hang the panel on two bolts. (

z

 mark 

) [Figure 4]

7.  Rotate the hook and put it into the slot of the panel. And install the panel temporarily.

[Figure 5]

8.  Tighten the two bolts which were used to install the panel temporarily and the other two bolts.
9.  Open a lid of the control box.
10.  Fix the louver motor wiring and the drain pump wiring with clamp. And put louver motor wiring into 

the control box. [Figure 6]

11.  Connect the connector of louver motor. [Figure 6]
12.  Attach two chains to the air return grille with two screws. [Figure 7]
13.  Install the corner panels back to original places. At that time attach the chains to the panel with 

screws together.

14.  Close the air return grille.

Piping side

Control box

Drain hose Side

Corner panel

Screw

[Figure 7]

[Figure 4]

[Figure 3]

[Figure 5]

[Figure 5]

[Figure 2]

[Figure 1]

Chain

Chain











[Figure 6]

Drain pump connector

Louver motor connector

Wire intake

Wiring clamp

Louver motor wiring

 Drain pipe

Caution

z

  Install the drain pipe according to the installation manual in order to drain properly.

Imperfection in draining may cause fl ood indoors and wetting the household goods etc.

z

  Do not put the drain pipe directly into the ditch where toxic gas such as sulfur, the other harmful and

infl ammable gas is generated. Toxic gas would fl ow into the room and it would cause serious 

damage to user’s health and safety (some poisoning or defi ciency of oxygen). In addition, it may 

cause corrosion of heat exchanger and bad smell.

z

  Connect the pipe securely to avoid water leakage from the joint.

z

  Insulate the pipe properly to avoid condensation drop.

z

  Check if the water can fl ow out properly from both the drain outlet on the indoor unit and the end of 

the drain pipe after installation.

z

  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 suffi cient space for inspection and 

maintenance.

 Wiring-out position and wiring connection

z

  Electrical installation work must be performed according to the installation manual by an electrical 

installation service provider qualifi ed 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.

z

  Use specifi ed cord, fasten the wiring to the terminal securely, and hold the cord securely in order not 

to apply unexpected stress on the terminal.

z

  Do not put both power source line and signal line on the same route. It may cause 

miscommunication and malfunction.

z

  Be sure to do D type earth work.

z

  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 clamp.
4.  Install a lid of the control box back to original place.

 Panel installation

z

  After wiring work fi nished, install the panel on the indoor unit.

z

  Refer to attached panel installation manual for details.

Indoor unit

hose

Strap (Accessory)

Pipe cover (Accessory)

The thickness of insulation should be 20mm or more.

Pipe cover (small)

(For insulation)

(Accessory)

Unit

pipe cover (big)

(For insulation)

(Accessory)

Joint for VP-20

(Prepare on site)

Drain socket

Connect

 VP-20

(Prepare on site)

Pipe cover (small)

(For insulation)

(Prepare on site)

Drain hose

(Accessory)

 Clamp

(Accessory

*

Descending stop greater than 1/100

As wide as possible 

(about100mm)

VP-30 or bigger

Accessory items

1

Hook

1 piece

For fi xing temporarily

2

Chain

2 pieces

3

Bolt

4 pieces

For installing the panel

4

Screw

1 piece

For attaching a hook

5

Screw

2 pieces

For attaching a chain

Check list after installation

z

  Check the following items after all installation work completed.

Check if

Expected trouble

Check

The indoor and outdoor units are fi xed securely?

Falling, vibration, noise

Inspection for leakage is done?

Insuffi cient 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 specifi ed size?

PCB burnt out, not working at all

Any obstacle blocks airfl ow on air inlet and outlet?

Insuffi cient capacity

Drain plug

Power source side terminal block

Earth

Wiring between indoor

and outdoor unit

Signal side terminal block

Remote controller line

Wiring clamp

Single split (PAC) series

Power source side terminal block

Earth

Indoor power source line

Signal side terminal block

Signal line (shielded cord)
Remote controller line

Wiring clamp

VRF (KX) series

Earth (signal line)

(see next page)