Mitsubishi Heavy Industries 112KXE6, Service Manual

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 163 

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(j)  Ceiling suspended type (FDE)

PFA012D618

①

Before installation

Air return grille 

Accessories

are inside.

235(Liquid piping)

195(Gas piping)

271

110

76

135

75

10

109

53

53

Unit interior

10 mm slope

Gas

piping

Liquid

piping

Refrigerant line

Drain piping

(right)

Drain piping (left)

Blowout opening 

Wall 

215

290

690

24

24

B

A

60

100

60

47

120

175

19

27

31

27

108

Right outlet

Top outlet 

Rear outlet 

Rear cover 

Cutout parts 

Top cover 

Drain line 

(left)

Drain line 

(rear left)  

Grille upside

(Indoor unit)

Filter

Pin

Side panel screw 

(1 each on the left and right) (M4)

Side panel

Indoor

unit

Hanging plate

Unscrew 

8-12mm

Hanging plate 

screw

Hanging

plate fixing 

bolts(M8)

Hanging plate

4000~5000mm or more 

100mm

or more 

300mm or mor

e 

150mm or more 

5mm or more 

Obstacle

Remove the line 

Location of pipe outlets 

※

The outlet through which the pipings are taken out 

is available in three directions. 

Pipe position 

Pitch of suspension bolts 

③

Preparation before installation (continued)

②

Selection of installation location for the indoor unit

Accessory item 

For unit hanging 

For refrigerant pipe 

Flat washer (M10)  Paper pattern  Pipe cover (large)  Pipe cover (small) 

Strap

8

1

1

1

4

For unit hanging

For heat insulation 

of gas pipe

For heat insulation

of liquid pipe 

For fixing of pipe 

cover

For unit hanging 

and adjustment

①

 Select the suitable areas to install the unit under approval of the user.

・

Areas  where  the  indoor  unit  can  deliver  hot  and  cold  wind  sufficiently. 
Suggest to the user to use a circulator if the ceiling height is over 3m to 
avoid warm air being accumulated on the ceiling.

・

Areas where there is enough space to install and service.

・

Areas where it can be drained properly. Areas where drain pipe descend-
ing slope can be taken.

・

Areas where there is no obstruction of airflow on both air return grille and air supply port.

・

Areas where fire alarm will not be accidentally activated by the air conditioner.

・

Areas where the supply air does not short-circuit.

・

Areas where it is not influenced by draft air.

・

Areas not exposed to direct sunlight.

・

Areas where dew point is lower than around 23°C and relative humidity is lower than 80%.

  This indoor unit is tested under the condition of JIS (Japan Industrial Stan-

dard) high humidity condition and confirmed there is no problem. How-
ever, there is some risk of condensation drop if the air conditioner is oper-
ated under the severer condition than mentioned above.

・

Areas where TV and radio stays away more than 1m. (It could cause jamming and noise.)

・

Areas where any items which will be damaged by getting wet are not placed 
such as food, table wares, server, or medical equipment under the unit.

・

Areas where there is no influence by the heat which cookware generates.

・

Areas where not exposed to oil mist, powder and/or steam directly such as above fryer.

・

Areas where lighting device such as fluorescent light or incandescent light 
doesn’t affect the operation.

         (A beam from lighting device sometimes affects the infrared receiver for the 

wireless remote controller and the air conditioner might not work properly.)

②

Check if the place where the air conditioner is installed can hold the weight of the unit. 
If it is not able to hold, reinforce the structure with boards and beams strong enough 
to hold it. If the strength is not enough, it could cause injury due to unit falling.

③

If there are 2 units of wireless type, keep them away for more than 6m to 
avoid malfunction due to cross communication.

④

When plural indoor units are installed nearby, keep them away for more than 4 to 5m.

③

Preparation before installation

INSTALLATION MANUAL FOR CEILING SUSPENDED 

TYPE (FDE)

This manual is for the installation of an indoor unit. 
For electrical wiring work (Indoor), refer to the electrical wiring work installation 
manual. For remote controller installation, refer to the installation manual attached 
to a remote controller. For wireless kit installation, refer to the installation manual 
attached to a wireless kit. For electrical wiring work (Outdoor) and refrigerant pipe 
work installation for outdoor unit, refer to the installation manual attached to an 
outdoor unit. 

Pitch of suspension bolts and pipe position 

1.  Remove the air return grille.

  Slide stoppers (4 places) of the catches,
  then pull out the pins ( 4 or 6 places).

3.  Remove the hanging plate.

Remove the screw, and then loosen 
the fixing bolts.

2.  Remove the side panel.

Remove the screw and detach the 
side panel by sliding it toward the 
direction indicated by the arrow mark.

Move the box as close to the installation area as possible packed.
If it must be unpacked, wrap the unit with a nylon sling, 
and be careful not to damage the unit.
If you need to lay the unit on a floor after unpacking, always 
put it with the intake grille facing upward.

PFA012D618 

Series

type

A

B

40 to 50type

1070

1022

60 to 71type

1320

1272

100 to 140type 1620

1572

36 to 56type

1070

1022

71type

1320

1272

112 to 140type

1620

1572

Single Split (PAC) 

series

VRF (KX) series 

For drain pipe 

Drain hose

(with clamp) Fixing bracket Screw (M4) Heay insulation

1

1

2

1

For drain hose

For drain pipe

connection

For fixing of 

drain hose 

For installing of 

fixing bracket 

For air return grille 

 Screw 

4

For fixing air

return grille

Preparation before instalation 

④

Remote controller

Installation of remote controller 

Up to two receiver or wired remote controller can be installed in one indoor unit  

group. 

Space for installation and service 

Haulage

(mm)

  Install correctly according to the installation manual. 

Confirm the following points: 

Unit type/Power supply specification       Pipes/Wires/Small parts      Accessory items 

If suspension bolt becomes longer, do reinforcement of earthquake resistant. 

For grid ceiling 
When suspension bolt length is over 500mm, or the gap between the ceiling 
and roof is over 700mm, apply earthquake resistant brace to the bolt. 
In case the unit is hanged directly from the slab and is installed on the 
ceiling plane which has enough strength. 
When suspension bolt length is over 1000mm, apply the earthquake resistant brace to the bolt. 

Prepare four (4) sets of suspension bolt, nut and spring washer (M10) on site.

When both wired and wireless remote controller are used 

It is necessary to set wired or wireless remote controller as slave. 

(For the method of changing the setting, refer to the installtion  
manual attached to remote controller or wireless kit.) 

When wired remote controller are used only (wireless type)
It is necessary to remove the line that is connected to the receiver.
Remove signal line connected to the receiver from primary side of 
terminal block (X, Y).

ATTENTION

①

Insulate with tape the removed line.

②

The LED of that removed connector will not be able to make any 

    indication.

Read the “SAFETY PRECAUTIONS” carefully first of all and then strictly follow it during 
the installation work in order to protect yourself.
The precautionary items mentioned below are distinguished into two levels,                      and                     .

: Wrong installation would cause serious consequences such as injuries or death.

: Wrong installation might cause serious consequences depending on circumstances.

Both mentions the important items to protect your health and safety so strictly follow them by any means.
After completing the installation, do commissioning to confirm there are no abnormalities, and explain to the 
customers about “SAFETY PRECAUTIONS”, correct operation method and maintenance method (air filter cleaning, 
operation method and temperature setting method) with user’s manual of this unit.
Ask your customers to keep this installation manual together with the user’s manual. Also, 
ask them to hand over the user’s manual to the new user when the owner is changed.

CAUTION

CAUTION

Installation should be performed by the specialist. 

  If you install the unit by yourself, it may lead to serious trouble such as water leakage, electric shock, fire, 

and injury due to overturn of the unit. 

Install the system correctly according to these installation manuals.  

  Improper installation may cause explosion, injury, water leakage, electric shock, and fire. 

Consider measurement not to exceed the limit of the density of refrigerant in the event of 

leakage especially when it is installed in a small room. 

  Consult the specialist about the measure. If the density of refrigerant exceeds the limit in the event of the 

leakage, serious accidents may occur due to lack of oxygen. 

Use the genuine accessories and the specified parts for installation. 

If parts unspecified by our company are used it could cause water leakage, electric shock, fire, and injury due to overturn of the unit. 

Ventilate the working area well in case the refrigerant leaks during installation. 

  If the refrigerant contacts the fire, toxic gas is produced. 

Install the unit in a location that can hold heavy weight. 

  Improper installation may cause the unit to fall leading to accidents. 

Install the unit properly in order to be able to withstand strong winds such as typhoons, and earthquakes. 

  Improper installation may cause the unit to fall leading to accidents. 

Do not mix air in to the cooling cycle on installation or removal of the air conditioner. 

  If air is mixed in, the pressure in the cooling cycle will rise abnormally and may cause explosion and injuries. 

Be sure to have the electrical wiring work done by qualified electrical installer, and use exclusive circuit. 

  Power source with insufficient capacity and improper work can cause electric shock and fire. 

Use specified wire for electrical wiring, fasten the wiring to the terminal securely, and hold 

the cable securely in order not to apply unexpected stress on the terminal. 

  Loose connections or hold could result in abnormal heat generation or fire. 

Arrange the electrical wires in the control box properly to prevent them from rising. Fit the 

lid of the services panel property. 

  Improper fitting may cause abnormal heat and fire. 

Check for refrigerant gas leakage after installation is completed. 

If the refrigerant gas leaks into the house and comes in contact with a fan heater, a stove, or an oven, toxic gas is produced. 

Use the specified pipe, flare nut, and tools for R410A. 

Using existing parts (R22) could cause the unit failure and serious accident due to explosion of the cooling cycle. 

Tighten the flare nut according to the specified method by with torque wrench. 

If the flare nut were tightened with excess torque, it could cause burst and refrigerant leakage after a long period. 

Make sure there is no dust or clogging on both the plug and the socket nor loose connec-

tion of the socket before plugging, and plug in securely to the end of the blade. 

  Accumulation of dust, clogging on the socket or plug, or loose installation of the socket could cause 

electric shock and fire. Replace the socket if it is loose. 

Connect the pipes for refrigeration circuit securely in installation work before compressor is operated. 

  If the compressor is operated when the service valve is open without connecting the pipe, it could cause 

explosion and injuries due to abnormal high pressure in the system. 

Stop the compressor before removing the pipe on pump down work. 

If the pipe is removed when the compressor is in operation with the service valve open, air would be mixed in the 
refrigeration circuit and it could cause explosion and injuries due to abnormal high pressure in the cooling cycle. 

Use the genuine optional parts. And installation should be performed by a specialist. 

  If you install the unit by yourself, it could cause water leakage, electric shock and fire. 

Do not repair by yourself. And consult with the dealer about repair. 

  Improper repair may cause water leakage, electric shock or fire. 

Consult the dealer or a specialist about removal of the air conditioner. 

  Improper installation may cause water leakage, electric shock or fire. 

Turn off the power source during servicing or inspection work. 

If the power is supplied during servicing or inspection work, it could cause electric shock and injury by the operating fan. 

Do not run the unit when the panel or protection guard are taken off. 

  Touching the rotating equipment, hot surface, or high voltage section could cause an injury to be caught in 

the machine, to get burned, or electric shock. 

Shut off the power before electrical wiring work. 

  It could cause electric shock, unit failure and improper running. 

  Perform earth wiring surely. 

  Do not connect the earth wiring to the gas pipe, water pipe, lightning rod and telephone earth 

wiring. Improper earth could cause unit failure, fire and electric shock due to a short circuit. 

  Use the circuit breaker of correct capacity. 

  Using the incorrect capacity one could cause the system failure and fire. 

Do not use any materials other than a fuse of correct capacity where a fuse should be used. 

  Connecting the circuit by wire or copper wire could cause unit failure and fire. 

Do not install the indoor unit near the location where there is possibility of flammable gas leakages. 

  If the gas leaks and gathers around the unit, it could cause fire. 

  Do not install and use the unit where corrosive gas (such as sulfurous acid gas etc.) 

or flammable gas (such as thinner, petroleum etc.) may be generated or accumu-

lated, or volatile flammable substances are handled. 

It could cause the corrosion of heat exchanger, breakage of plastic parts etc. And inflammable gas could cause fire. 

  Do not use the indoor unit at the place where water splashes such as laundry. 

  Indoor unit is not waterproof. It could cause electric shock and fire. 

  Do not use the indoor unit for a special purpose such as food storage, cooling for 

precision instrument, preservation of animals, plants, and a work of art. 

  It could cause the damage of the items. 

  Do not install nor use the system near equipments which generate electromagnetic 

wave or high harmonics. 

Equipments like inverter equipment, private power generator, high-frequency medical equipment, or telecommunication 
equipment might influence the air conditioner and cause a malfunction and breakdown. Or the air conditioner might 
influence medical equipments or telecommunication equipments, and obstruct their medical activity or cause jamming. 

  Do not install the remote controller at the direct sunlight. 

  It could cause breakdown or deformation of the remote controller. 

  Do not install the indoor unit at the place listed below. 

· Places where flammable gas could leak. 
· Places where carbon fiber, metal powder or any powder is floated. 
· Place where the substances which affect the air conditioner are generated such as sulfide gas, 

chloride gas, acid or alkali. 

· Places exposed to oil mist or steam directly. 
· On vehicles and ships 
· Places where machinery which generates high harmonics is used. 
· Places where cosmetics or special sprays are frequently used. 
· Highly salted area such as beach. 
· Heavy snow area 
· Places where the system is affected by smoke from a chimney. 
· Altitude over 1000m 

  Do not put any valuables which will break down by getting wet under the air conditioner. 

  Condensation could drop when the relative humidity is higher than 80% or drain pipe is clogged, 

and it damages user’s belongings. 

  Do not use the base frame for the outdoor unit which is corroded or damaged after 

a long period of use. 

  It could cause the unit falling down and injury. 

  Pay attention not to damage the drain pan by weld sputter when brazing work is done near the unit. 

  If sputter entered into the unit during brazing work, it could cause damage (pinhole) of drain pan 

and leakage of water. To avoid damaging, keep the indoor unit packed or cover the indoor unit. 

  Install the drain pipe to drain the water surely according to the installation manual. 

  Improper connection of the drain pipe may cause dropping water into room and damaging user’s belongings.

  Do not put the drain pipe directly into the ditch where toxic gas such as sulfide gas is generated. 

  Toxic gas would flow into the room and it would cause serious damage to user’s health and safety. 

Do not share the drain pipe for indoor unit and GHP (Gas Heat Pump system) outdoor unit. 

  Toxic exhaust gas would flow into room and it might cause serious damage (some poisoning or 

deficiency of oxygen) to user’s health and safety. 

  For drain pipe installation, be sure to make descending slope of greater than 1/100, 

not to make traps, and not to make air-bleeding.  

Check if the drainage is correctly done during commissioning and ensure the space for inspection and maintenance. 

Ensure the insulation on the pipes for refrigeration circuit so as not to condense water. 

Incomplete insulation could cause condensation and it would wet ceiling, floor, and any other valuables. 

Do not install the outdoor unit where is likely to be a nest for insects and small animals. 

  Insects and small animals could come into the electronic components and cause breakdown and 

fire. Instruct the user to keep the surroundings clean. 

  Pay extra attention, carrying the unit by hand. 

  Carry the unit with 2 people if it is heavier than 20kg. Do not use the plastic straps but the grabbing 

place, moving the unit by hand. Use protective gloves in order to avoid injury by the aluminum fin. 

  Make sure to dispose of the packaging material. 

  Leaving the materials may cause injury as metals like nail and woods are used in the package. 

  Do not operate the system without the air filter. 

  It may cause the breakdown of the system due to clogging of the heat exchanger. 

  Do not touch any button with wet hands. 

  It could cause electric shock. 

  Do not touch the refrigerant piping with bare hands when in operation. 

  The pipe during operation would become very hot or cold according to the operating condition, 

and it could cause a burn or frostbite. 

  Do not clean up the air conditioner with water. 

  It could cause electric shock. 

  Do not turn off the power source immediately after stopping the operation. 

  Be sure to wait for more than 5 minutes. Otherwise it could cause water leakage or breakdown. 

  Do not control the operation with the circuit breaker. 

It could cause fire or water leakage. In addition, the fan may start operation unexpectedly and it may cause injury. 

WARNING 

CAUTION

SAFETY PRE CAUTIONS