Mitsubishi Electric MCFZ-A12WV, MUZ-A12YV, MUZ-A12YVH Installation Manual

Floor and Ceiling Type Air-Conditioner

HFC

utilized

R410A

English

CONTENTS

MCFZ-A12WV
MUZ-A12YV(H)

[FLARE CONNECTION TYPE]

INSTALLATION MANUAL

1. THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR

SAFETY ........................................................................................... 2

2. SELECTING THE INSTALLATION LOCATION ............................... 2

3. INSTALLATION DIAGRAM & ACCESSORIES ................................ 3

4. INDOOR UNIT INSTALLATION ....................................................... 4

5. OUTDOOR UNIT INSTALLATION ................................................... 9

6. INDOOR/OUTDOOR UNIT CONNECTION FINISHING AND

TEST RUN ..................................................................................... 10

7. FOR MOVEMENT AND MAINTENANCE ...................................... 13

FOR INSTALLER

1. THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR

285 mm

40 mm

344.5 mm
304 - 325 mm

800 mm

500 mm

150
mm

SAFETY

•

Please provide an exclusive circuit for the air conditioner and do not connect other electrical appliances to it.

• Be sure to read “THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY” before installing
the air conditioner.

• Be sure to observe the cautions specified here as they include important items related to safety.

• The indications and meanings are as follows.

Warning: Could lead to death, serious injury, etc.
Caution: Could lead to serious injury in particular environments when operated incorrectly.

• After reading this manual, be sure to keep it together with the instruction manual in a handy place on
the customer’s site.

Warning

■ Do not install it by yourself (customer).

Incomplete installation could cause injury due to
fire, electric shock, the unit falling or leakage of
water. Consult the dealer from whom you pur­chased the unit or special installer.

■ Install the unit securely in a place which can
bear the weight of the unit.

When installed in an insufficient strong place, the
unit could fall causing injury.

■ Use the specified wires to connect the indoor
and outdoor units securely and attach the
wires firmly to the terminal block connecting
sections so the stress of the wires is not ap­plied to the sections.

Incomplete connecting and fixing could cause a fire.

■ Do not use intermediate connection of the
power cord or the extension cord and do not
connect many devices to one AC outlet.

It could cause a fire or an electric shock due to
defective contact, defective insulation, exceeding
the permissible current, etc.

■ Check that the refrigerant gas does not leak
after installation has completed.

If refrigerant gas leaks indoors, and comes into
contact with the fire of a fan heater, space heater,
stove, etc., harmful substances will be generated.

■ Perform the installation securely referring to
the installation manual.

Incomplete installation could cause a personal
injury due to fire, electric shock, the unit falling or
leakage of water.

■ Earth the unit.

Do not connect the earth to a gas pipe, water
pipe, lightning rod or telephone earth. Defective
earthing could cause an electric shock.

■ Do not install the unit in a place where an in­flammable gas leaks.

If gas leak and accumulate in the area surround­ing the unit, it could cause an explosion.

■ Install an earth leakage breaker depending on
the installation place (Where it is humid).

If an earth leakage breaker is not installed, it could
cause an electric shock.

Caution

■ Perform electrical work according to the in­stallation manual and be sure to use an ex­clusive circuit.

If the capacity of the power circuit is insufficient
or there is incomplete electrical work, it could
result in a fire or an electric shock.

■ Attach the electrical part cover to the indoor
unit and the service panel to the outdoor unit
securely.

If the electrical part cover in the indoor unit and/
or the service panel in the outdoor unit are not
attached securely, it could result in a fire or an
electric shock due to dust, water, etc.

■ Be sure to use the part provided or specified
parts for the installation work.

The use of defective parts could cause an injury
or leakage of water due to a fire, an electric shock,
the unit falling, etc.

■ Be sure to cut off the main power in case of
setting up the indoor electronic control P.C.
board or wiring works.

It could cause an electric shock.

■ The appliance shall be installed in accordance
with national wiring regulations.

■ When installing or relocating the unit, make
sure that no substance other than the speci­fied refrigerant (R410A) enters the refrigerant
circuit.

Any presence of foreign substance such as air
can cause abnormal pressure rise or an explo­sion.

■ Perform the drainage/piping work securely
according to the installation manual.

If there is a defect in the drainage/piping work,
water could drop from the unit and household
goods could be wet and damaged.

■ Fasten a flare nut with a torque wrench as
specified in this manual.

When fastened too tight, a flare nut may broken
after a long period and cause a leakage of re­frigerant.

2. SELECTING THE INSTALLATION LOCATION

2-1 INDOOR UNIT

• Where airflow is not blocked.

• Where cool air spreads over the entire room.

• Maximum refrigerant piping length between indoor unit and outdoor unit is 20 m and the difference of height
of both units is 12 m.

• Rigid wall without vibration.

• Where it is not exposed to direct sunshine.

• Where easily drained.

• At a distance 1 m or more away from your TV and radio. Operation of the air conditioner may interfere with
radio or TV reception in areas where reception is weak. An amplifier may be required for the affected device.

• In a place as far away as possible from fluorescent and incandescent lights (so the infrared remote control
can operate the air conditioner normally).

• Where the air filter can be removed and replaced easily.

2-2 WIRELESS REMOTE CONTROLLER MOUNTING

• Place of mounting

- Where it is easy to operate and easily visible.

- Where children cannot touch.

• Mounting

Select a position about 1.2 m above the floor, check that signals from the controller are surely received by
the indoor unit from that position (‘beep’ or ‘beep-beep’ receiving tone sounds), attach remote controller
holder 4 to a pillar or wall, then set the wireless remote controller 3.

In rooms where inverter type fluorescent lamps are used, the signal from the wireless remote controller may
not be received.

2-3 OUTDOOR UNIT

• Where it is not exposed to strong wind.

• Where airflow is good and dustless.

• Where it is not exposed to rain and direct sunshine.

• Where neighbours are not annoyed by operation sound or hot air.

• Where rigid wall or support is available to prevent the increase
of operation sound or vibration.

• Where there is no risk of combustible gas leakage.

• When installing the unit at a high level, be sure to fix the unit legs.

• Where it is at least 3 m away from the antenna of TV set or
radio. Operation of the air conditioner may interfere with radio
or TV reception in areas where reception is weak. An amplifier
may be required for the affected device.

• Install the unit horizontally.

• Please install it in an area not affected by snowfall or blowing snow. In areas with heavy snow, please install
a canopy, a pedestal and/or some baffle boards.

Note:
It is advisable to make a piping loop near outdoor unit so as to reduce vibration transmitted from there.

Caution:

Avoid the following places for installation where air conditioner trouble is liable to occur.

• Where flammable gas could leak.

• Where there is much machine oil.

• Salty places such as the seaside.

• Where sulfide gas is generated such as a hot spring.

• Where there is high-frequency or wireless equipment.

2-10 mm × 21 mm slot

2

Air inlet

Air outlet

2

1

2

A

I

E

C

8

7

G

F

4

3

6

5

3. INSTALLATION DIAGRAM & ACCESSORIES

Remark:
Accessories of this unit are packed inside the unit. Please remove
the front grille as shown in the right (See “FRONT GRILL RE­MOVAL”), and check accessories before installation.

500 mm or more

1000 mm or more

500 mm or more

500 mm or more

500 mm or more

Front grille

Accessories

Basically open 100 mm or
more without any
obstruction in front and on
both sides of the unit.

100 mm or more

Open two sides
of left, right, or
rear side.

200 mm or more

100 mm or more

350 mm or more

ACCESSORIES

Check the following parts before installation.
<Indoor unit>

1 Installation plate 2
2 Unit fixing screw 5 × 12 mm 2
3 Wireless remote controller 1
4 Remote controller holder 1
5 Fixing screw for 4 3.5 × 16 mm (Black) 2
6 Battery (AAA) for remote controller 2
7 Drain hose 1
8 Drain pipe cover 1
9 Knockout cover 1
0 Screw for 9 4 × 10 mm 2

Item Q’ty

<Outdoor unit: For YV type only>

A Drain socket 1

OPTIONAL PARTS

Air cleaning filter MAC-1200FT
Deodorizing filter MAC-1700DF

Name Parts No.

When the piping is to be attached to a wall contain­ing metals (tin plated) or metal netting, use a chemi­cally treated wooden piece 20 mm or thicker be­tween the wall and the piping or wrap 7 to 8 turns
of insulation vinyl tape around the piping.

Units should be installed by licensed contractor accordingly
to local code requirement.

Note:
When operating the air conditioner in low out­side temperature, be sure to follow the instruc­tions described below.

• Never install the outdoor unit in a place
where its air inlet/outlet side may be ex­posed directly to wind.

• To prevent exposure to wind, install the
outdoor unit with its air inlet side facing the
wall.

• To prevent exposure to wind, it is recom­mended to install a baffle board on the air
outlet side of the outdoor unit.

PARTS TO BE PROVIDED AT YOUR SIDE

A Refrigerant pipe 1 set
B Indoor/outdoor connecting wire (4-core 1.0 mm
C Piping tape 1
D Drain pipe (PVC pipe : OD ø26) 1
E Pipe fixing band for refrigerant pipe

(The quantity depends on the pipe length.)

F Fixing screw for E

(The quantity depends on the pipe length.)

G Drain-joint pipe (PVC pipe : OD ø26, L=50 mm) 1
H Power supply cord (3-core 1.0 mm
I Piping hole repair parts (Putty and Wall hole cover) 1
J Installation plate fixing bolt (M10) 4
K Nut, Spring washer for J (M10) 4 set

Item Q’ty

2

)1

2

)1

REFRIGERANT AND DRAIN PIPE SIZES

Refrigerant pipe

Drain pipe Hard PVC pipe : OD ø26

Liquid OD ø6.35
Gas OD ø9.52

2 to 5

2 to 5

3

4. INDOOR UNIT INSTALLATION

a

b

c

d

e

a

a

b

a

1

300 mm

150 mm

1065 mm

f

J

g

c

J

1

FLARED CONNECTIONS

• This unit has flared connections on both indoor and outdoor sides.

• Refrigerant pipes are used to connect the indoor and outdoor units as shown in the figure below.

• Insulate both refrigerant and drain piping completely to prevent condensation.

Pipe length 20 m max.
Height difference 12 m max.
No. of bends 10 max.

• Refrigerant adjustment … If pipe length exceeds 7 m, additional refrigerant (R410A) charge is required.
(The outdoor unit is charged with refrigerant for 7 m pipe length.)

Pipe length

Refrigerant to be added

PIPING PREPARATION

1 Table below shows the specifications of pipes commercially available.

Pipe Outside diameter Insulation thickness Insulation material

For liquid 6.35 mm 8 mm Heat resisting foam plastic

For gas 9.52 mm 8 mm 0.045 specific gravity

• Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm. Never use any pipe with a
thickness less than 0.8 mm, as the pressure resistance is insufficient.

2 Ensure that the 2 refrigerant pipes are well insulated to prevent condensation.

3 Refrigerant pipe bending radius must be 100 mm or more.

Caution:
Be sure to use the insulation of specified thickness. Excessive thickness may cause incorrect installa­tion of the indoor unit and lack of thickness may cause dew drippage.

Limits

Up to 7 m No additional charge is required.

Exceeding 7 m

Additional charge is required.

(Refer to the table below.)

30 g/m × (refrigerant piping length (m) -5)

4-1 A CASE OF SUSPENDING INDOOR UNIT FROM THE CEILING

4-1-(1) MOUNTING INSTALLATION PLATE FIXING BOLTS

1. Determine the locations of installation plate fixing bolts.

• Use installation pattern to determine the locations of instal-

lation plate fixing bolts J.

a Installation pattern

Details are printed on pattern.
Attention: Surrounding temperature and humidity conditions

may cause paper pattern to shrink or expand.
(Measure dimensions before drilling holes.)

2. Suspension structure (Give site of suspension strong struc­ture).

■ Wood structure

• Select tie beam (one-story houses) or second-floor
girder (two story houses) as reinforcement member.

• Use sturdy beams of at least 60 mm square for beam
pitch of 900 mm or less or of at least 90 mm square for
beam pitch of 900-1800 mm.

a Pitch b Ceiling
c Rafter d Bracket
e Roof beam

■ Ferroconcrete Structures

• Secure installation plate fixing bolts J as shown at the
right or use angle-stock bracework to install installa­tion plate fixing bolts J.

f Use inserts rated at 100-150 kg each
g Steel reinforcing rod
J Installation plate fixing bolts

*Remove installation pattern after installation.

3. Installation plate fixing bolts pitch.

• Use the installation plate fixing bolts J M10 (× 4 procure

locally).

a Indoor unit b Air outlet

1 Installation plate

• Projecting dimension of installation fixing bolts J from hori-

zontal base line against which you fix installation plate 1
as within at the right.

c Horizontal base line 1 Installation plate
J Installation fixing bolts

4

max. 40 mm

FRONT

4-1-(2) FIXING OF INSTALLATION PLATES

1

1028 mm

1

a

J

a

K-1
K-2

1

K-2
K-3

1

K-2

K-3

J

a

a

1

b

c

0

115

188

132

124

0

Ø40

Ø75

a

e

f

d

188

193

199

204

115

155

0

100

200

300

FRONT

1. Set installation plates to installation plate fixing bolts.

• Set installation plates 1 to installation plate fixing bolts J

so that the distance between insides of installation plates
is adjusted to length as shown in the right.

1 Installation plate

• Installation plates 1 should be fixed on one way direction,

as shown in Fig. 1.
Don’t fix as shown in Fig. 2.

• Be sure to confirm letters “FRONT” in installation plates 1,

set “FRONT” side to air outlet side of indoor unit.

a “FRONT”

1 Installation plate

2. In case of fixing installation plates 1 above the ceiling, put

installation plates fixing bolt through a nut, a spring washer,
the installation plate, a spring washer, and double nut. (Fig. 3)
In case of fixing installation plates 1 forward the ceiling
directly, also put installation plate fixing bolt through the in­stallation plate, a spring washer, and double nuts. (Fig. 4)

a Ceiling K-1 Nut (M10)
1 Installation plate K-2 Spring washer
J Installation plate fixing bolt K-3 Double nut (M10)

(Fig. 1) (Fig. 2)

(Fig. 3) (Fig. 4)

4-1-(4) FRONT GRILLE REMOVAL

• Remove front grille and transportation support.

Remove 3 screws

Front grille

4-1-(5) OPENING KNOCKOUT HOLE

• Remove knockout holes with hammering it.

Knockout hole

Transportation support

* After installing com-

pletely, please remove
this part because this is
used for transportation
only.

3. Check that the four corners are horizontal with level gauge.

Knockout hole for drain pipe

(Fig. 5)

a Level gauge

4-1-(6) FIXING UNIT TO INSTALLATION PLATES

1. Suspending unit from installation plates.

• Hoist unit so that hanging bolt (4) on the sides of unit fit into holes in installation plates 1.

Unit fixing screw 2

4-1-(3) DRILLING HOLE

Determine the locations of holes for refrigerant pipe A and drain

(Fig. 5)

pipe D.

• Use the installation pattern as mentioned in 4-1-(1).

Unit fixing screw 2

• Be sure to confirm the dimensions as shown in the right.

a Horizontal base line b Hole for refrigerant pipe
c Hole for drain pipe

1 Installation plate

• Specially, drill the hole for drain pipe with designate dimen-

(unit : mm)

sion to keep an inclination.

d Horizontal base line e Hanging bolt
f Wall

(unit : mm)

2. Securing unit to installation plates.

• Be sure to tighten unit fixing screw 2 to unit securely.

5

Hanging bolt

• Be sure to set hanging bolt
in this position to keep
unit’s inclination.

1028 mm

1065 mm

80 mm

95 mm

132 mm

300 mm

300 mm

155 mm

Ø75

Ø75

4-2 A CASE OF INSTALLATING INDOOR UNIT ON THE WALL

FRONT

A CB

4-2-(1) MOUNTING INSTALLATION PLATE FIXING BOLTS

1. Determine the locations of installation plate fixing bolts.

• Use installation pattern to determine the locations of installation plate fixing bolts J.

Installation pattern

4-2-(6) FIXING UNIT TO INSTALLATION PLATES

1. Suspending unit from installation plate.

• Hoist unit so that hanging bolt (4) on the sides of unit fit into holes in installation plate 1.

Installation plate 1

Unit fixing screw 2

* Remove installation pattern after installing.

2. Sturdy wall

• Find structural material (such as stud) in the wall.

3. Installation plate fixing bolt pitch.

• See to 4-1-(1) 3. (Page 5)

4-2-(2) FIXING OF INSTALLATION PLATES

1. Set installation plates 1 to installation plate fixing bolts J.

• See to 4-1-(2) 1. (Page 5)

2. Put installation plate fixing bolt through spring washer (2), and double nuts.

• See to 4-1-(2) 2 Fig. 4. (Page 5)

4-2-(3) DRILLING HOLE

Determine the location of hole for refrigerant pipes and drain pipe.

• Use the installation pattern as mentioned in 4-2-(1).

• Be sure to confirm the dimensions as below.

Installation plate 1

Hole for refrigerant and drain pipe (in the case of
rear piping)

Horizontal base line

Hole for refrigerant and drain pipe
(in the case of downward piping)

4-2-(4) FRONT GRILLE REMOVAL

• See to 4-1-(4). (Page 5)

Unit fixing screw 2

• Be sure to set
hanging bolt in

Hanging bolt

Hanging bolt

this position.

2. Securing unit to installation plates.

• Be sure to tighten unit fixing screw 2 to unit securely.

4-3 KNOCKOUT COVER

• After removing the knockout holes, attach knockout cover 9 on the knockout hold edge (shown as below).

Knockout
cover 9

Refrigerant
pipe

Drain pipe

Knockout

Drain pipe

Refrigerant
pipe

Refrigerant
pipe

Drain pipe

Knockout

4-2-(5) OPENING KNOCKOUT HOLE

• See to 4-1-(5). (Page 5)

Knockout

6

4-4 POWER SUPPLY AND CONNECTING WIRE SPECIFICATIONS

90°

R25 (R1"

) − R75 (R3"

)

110

90°

R15 − R50 (R2"

)

70

N

3

23

N

2

L~N

~

65 mm

15 mm

Use special room air conditioning circuit.

Rated voltage/Frequency Breaker capacity Power supply cord

230 V/50 Hz 10 A 3-core 1.0 mm

Indoor and Outdoor connecting Cable 4-core 1.0 mm
wire Specification Design 245 IEC 57.

2

in conformity with Design 245 IEC 57

2

, in conformity with

Screw

Terminal cover

Indoor terminal block

Earth wire
(green/yellow)

Indoor/outdoor unit
connecting wire B
4-core 1.0 mm

Outdoor terminal block

2

Power supply cord H

3-core with ground
IEC cord

• Peel off both ends of connecting wire and power supply cord as
shown in the right.

• Be careful not to contact connecting wire with piping.

• Make earth wire a little longer than the others.

(more than 65 mm)

Connect to the plug, or to a power switch which has a gap of 3 mm or more when open to interrupt the source
power phase.

Warning:

• A means for disconnection of the supply with an isolation switch, or similar device, in all active
conductors shall be incorporated in the fixed wiring.

• Never cut the power cord and connect it to other wires.
It may cause a fire.

4-5 INDOOR AND OUTDOOR CONNECTING WIRE CONNECTION

• Wiring connections should be made following the diagram.

1. Remove two screws and pull the terminal cover forward.

2. Be sure to fix the cable by cable clamp.

3. Replace the terminal cover securely.

Terminal block

1 Use care not to make mis-wiring.
2 Firmly tighten the terminal screws to prevent

them from loosening.

3 After tightening, pull the wires lightly to con-

firm that they do not move.

Loosen terminal screw

Connection details

Cable clamp

Warning:

• Attach the electrical part cover securely. If it is attached incorrectly, it could result in a fire, an elec­tric shock due to dust, water, etc.

• Use the specified indoor/outdoor unit connecting wire to connect the indoor and outdoor units and
fix the wire to the terminal block securely so that no stress is applied to the connecting section of
the terminal block. Incomplete connection or fixing of the wire could result in a fire.

• When connecting the power supply cord to the power supply source, be sure to connect each wire
to the correct pole. Be sure to connect the Live wire side to the L terminal and connect the Neutral
conductor side to the N terminal.

4-6 REFRIGERANT PIPE WORK

• Refrigerant pipes which are connected at side of indoor unit must be processed as below, and processed

figure will be differently made means of which the indoor unit is installed or which direction refrigerant pipes
are connected in.

1. In case that pipes are cut out from back surface of the indoor unit. (Fig. 1)

Process figure

Flare nut

Refrigerant pipe (gas)
OD ø15.88

Refrigerant pipe

Refrigerant pipe

Flare nut

Refrigerant pipe (liquid)
OD ø9.52

(Fig. 1)

7

48°

R50 (R2"

) - R60

80

38°

R30 - R40 (R1.5")

80

2. In case that pipes jut out from bottom surface of the indoor unit. (Fig. 2)

c

8

D

b

a

d

b

a

30

b

c

a

0.75 m - 1.5 m

i

g

h

f

e

d

8

7

a

G

50 mm

8

a

G

b

7

D

c

c

Process figure

Refrigerant pipe

Flare nut

Refrigerant pipe (gas)
OD ø15.88

2. In case of connecting drain pipe D to drain-joint bush through drain hose.

• Drain hose 7 which is contained in accessories is flexible, so use it when drain pipe D should be

alternated direction.

• Be sure to wind pipe cover which is provided in accessories around drain hose with vinyl tape.

• Cut VP-20 in dimension as shown at the right, and connect drain-joint bush with drain hose with adhe-

sive.

a Drain-joint bush
b Tape
c Adhesive

7 Drain hose

8 Drain pipe cover

D Drain pipe (VP-20)
G Drain-joint pipe (VP-20)

Refrigerant pipe

(Fig. 2)

Wall hole sealing and fixing pipe to wall

Indoor unit

Wall hole cover I

Seal the wall hole
gap with putty I.

Fix the pipe to wall with
pipe fixing band E.

Flare nut

Refrigerant pipe (liquid)
OD ø9.52

Cut off the
extra length. Pipe fixing

Fixing screw F

4-7 DRAIN PIPE CONNECTION

• Use hard PVC (ø26 mm O.D.) for drain pipe D.

• Use drain pipe cover 8 which is provided in accessories, wind it around drain pipe D in the indoor unit side.

• Use vinyl chloride adhesive for joints prevent leakage.

• When the drain pipe D has to go through an indoor space, be sure to cover the drain pipe D with insulation

readily available in the market.

• For drain pipe connection, use care so as no extra force applies to unit side piping.

1. In case of connecting drain pipe D to drain-joint bush directly.

• Be sure to connect drain pipe D to drain-joint bush securely as shown in the right.

• Be sure to pass drain pipe D with drain pipe cover through knockout hole on bottom surface so as to

keep an inclination.

a Drain-joint bush
b Knockout
c PVC adhesive tape
d Adhesive

8 Drain pipe cover

D Drain pipe (VP-20)

band E

3. • Be sure that drain pipe D tilts downward (1/100 or more) on outdoor side (drain side), and no traps or

heaving exist.

• When the drain pipe D is relatively long, provide support metal fixtures midway to eliminate waving.

• Odor trap at the end of drain pipe D is not required.

a Insulation
b Supporting metal fixture
c Downward inclination of 1/100 or more
d Air bleeder
e Do not raise
f Odor trap
g The end of drain hose is immersed in water
h Gap from the ground level is 50 mm or less
i Sewage ditch

8

5. OUTDOOR UNIT INSTALLATION

35 mm

15 mm

N

3

23

N

2

5-1 INDOOR/OUTDOOR UNIT CONNECTING WIRE CONNECTION

• Connect the indoor/outdoor unit connecting wire B from the indoor unit correctly on the terminal block.

• For future servicing, give extra length to connecting wire.

• Peel off both ends of connecting wire (extension wire).

• Be careful not to contact connecting wire with piping.

• Make earth wire a little longer than the others.

(more than 35 mm)

Service panel

• For the power supply cord and the indoor/outdoor unit connecting wires, be sure to use the ones in compli­ance with the standards.

• Be sure to push the core until it is hidden and pull each cable to make sure that it is not pulled up incomplete
insertion may cause a risk of burning the terminal blocks.

Indoor and Outdoor connecting wire
Specification

Loosen terminal screw.

Lead wire

Terminal block

<Connection details>

Cable 4-core 1.0 mm

2

, in conformity with Design 245 IEC 57.

Indoor terminal block

Earth wire
(green/yellow)

Indoor/outdoor unit
connecting wire B
4-core 1.0 mm

Outdoor terminal block

2

Caution:

• Use care not to make mis-wiring.

• Firmly tighten the terminal screws to prevent them from loosening.

• After tightening, pull the wires lightly to confirm that they do not move.

Remove one fixing
screw to open the

Be sure to fix the
indoor/outdoor unit
connecting wire B
using this cord clamp.

service panel.

Warning:
Be sure to attach the service panel of the outdoor unit securely. If it is not attached correctly, it could
result in a fire or an electric shock due to dust, water, etc.

5-2 DRAIN PIPING FOR OUTDOOR UNIT

• Provide drain piping before indoor and outdoor piping connection. (It will be hard to install drain socket A if

indoor and outdoor piping connection is conducted prior to drain piping as outdoor unit becomes immov­able.)

• Connect the drain hose 7 (obtainable at a store, inside diameter: 15 mm) as shown in the figure for drainage.

• Make sure to provide drain piping with a downhill grade for easy drain flow.

Drain hose 7

Drain socket A
(For YV type only)

Note:
Do not use the drain socket A in the cold region. Drain may freeze and it makes the fan stop.

9

A

90°

6. INDOOR/OUTDOOR UNIT CONNECTION FINISHING AND TEST RUN

6-1 Tools dedicated for the air conditioner with R410A refrigerant

The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools.
The diameter of the service port on the stop valve in outdoor unit has been changed to prevent any other
refrigerant being charged into the unit. (Cap size has been changed from 7/16 UNF with 20 threads to 1/2 UNF
with 20 threads.)

R410A tools Can R22 tools be used? Description

Gauge manifold No

Charge hose No

Gas leak detector No Dedicated for HFC refrigerant.
Torque wrench Yes 1/4

Flare tool Yes

Flare gauge New Provided for flaring work (to be used with R22 flare tool).

Vacuum pump adaptor New

Electronic scale for re­frigerant charging

New

No: Not substitutable for R410A Yes: Substitutable for R410A

R410A has high pressures beyond the measurement range of existing
gauges.
Port diameters have been changed to prevent any other refrigerant from
being charged into the unit.
Hose material and cap size have been changed to improve the pressure
resistance.

Clamp bar hole has been enlarged to reinforce the spring strength in the
tool.

Provided to prevent the back flow of oil. This adapter enables you to use
existing vacuum pumps.
It is difficult to measure R410A with a charging cylinder because the refrig­erant bubbles due to high pressure and high-speed vaporization.

6-2 FLARING WORK

• Main cause of gas leakage is defect in flaring work.
Carry out correct flaring work in the following procedure.

1. Pipe cutting

• Cut the copper pipe correctly with pipe cutter.

Tilted

No good

Uneven

Burred

Copper pipe

Good

2. Burrs removal

• Completely remove all burrs from the cut cross section of
pipe.

• Put the end of the copper pipe to downward direction as
you remove burrs in order to avoid to let burrs drop in the
piping.

3. Putting nut on

• Remove flare nuts attached to indoor and outdoor units,
then put them on pipe having completed burr removal.
(not possible to put them on after flaring work)

• Flare nut for R410A pipe may differ from R22 pipe depend­ing on pipe diameter.

mm inch R410A R22

ø6.35 1/4 17 17
ø9.52 3/8 22 22

4. Flaring work

• Carry out flaring work using flaring tool as shown below.

Flaring tool

Clutch type

Outside Conventional flare tool

diameter Clutch type Wing nut type

ø6.35 mm 0 to 0.5 1.0 to 1.5 1.5 to 2.0
ø9.52 mm 0 to 0.5 1.0 to 1.5 1.5 to 2.0

Flare tool for

R410A clutch type

• Firmly hold copper pipe in a die in the dimension shown in
the table above.

A (mm)

Wing nut type

Burr

Die

Copper pipe

Copper pipe

Flare nut

Flare nut

Spare
reamer

Pipe
cutter

Copper pipe

Yo r k

Die

Copper pipe

5. Check

• Compare the flared work with figure below.

• If flare is noted to be defective, cut off the flared section

and do flaring work again.

Smooth all around

Inside is shining without any scratches.

Even length
all around

10

6-3 PIPE CONNECTION

A

b

a

c

d

c

9

0

1. Indoor unit connection

• Connect both liquid and gas piping to the indoor unit.

- Apply a thin coat of refrigerant oil on the seat surface
of pipe.

- For connection first align the center, then hand tighten
the first 3 to 4 turns of flare nut.

- Use tightening torque table below as a guideline for
the indoor unit side union joint section, and tighten us­ing two wrenches. Excess tightening damages the
flared section.

Pipe diameter Tightening torque

mm N·m kgf·cm

6.35 13.7 to 17.7 140 to 180

9.52 34.3 to 41.2 350 to 420

2. Outdoor unit connection

• Connect pipes to stop valve pipe joint of the outdoor unit in
the same manner applied for the indoor unit.

- For tightening, use a torque wrench or spanner, and
use the same tightening torque applied for the indoor
unit.

3. Refrigerant pipe insulation

• Use pipe cover (foam polyethylene 8 mm thickness) which
is contained in accessories, insulate both liquid and gas
pipes together. Put the refrigerant piping and apply piping
tape C.

a Indoor unit refrigerant pipe
b Flare joint
d Pipe cover
A Refrigerant pipe
C Piping tape

6-4 PURGING PROCEDURES · LEAK TEST

• Use the vacuum pump for air purging for the purpose of environmental protection.

PURGING PROCEDURES

Connect the refrigerant pipes (both liquid pipe and the gas pipe) between the indoor and the outdoor unit.

Remove the service port cap of the stop valve on the side of the outdoor unit gas pipe. (The stop valve will
not work in it initial state fresh out of the factory (totally closed with cap on).)

Connect the gauge manifold valve and the vacuum pump to the service port of the stop valve on the gas
pipe side of the outdoor unit.

Run the vacuum pump. (Vacuumize for more than 15 minutes.)

Check the vacuum with the gauge manifold valve, then close the gauge manifold valve, and stop the vacuum
pump.

Leave as it is for one or two minutes. Make sure the pointer gauge manifold valve remains in the same
position. Confirm that the pressure gauge shows–0.101 Mpa [Gauge] (–760 mmHg).

Compound pressure
gauge (for R410A)

Pressure gauge
(for R410A)

Gauge manifold
valve (for R410A)

Handle High

Vacuum

Window

pump

Adapter for preventing the
back flow

Charge hose
(for R410A)

(or the vacuum pump with
the function to prevent the
back flow)

Charge hose
(for R410A)

-0.101MPa
(-760 mmHg)

Handle

Low
Stop
valve

*Close

*Open

Hexagonal wrench

*4 to 5 turns

Stop valve

Stop valve

Service port

Remove the gauge manifold valve quickly from the service port of the stop valve.

After refrigerant pipes are connected and evacuated, fully open all stop valves on both sides of gas pipe and
liquid pipe.

Connecting wire and
refrigerant pipes
must be separated.

Operating without fully opening lowers the performance and this causes trouble.

Pipe length up to 7 m

No gas charge is needed.

Pipe length exceeding 7 m

Charge the prescribed amount of

gas. (refer to 4)

Tighten the cap to the service port to obtain the initial status.

4. Knockout cover

• Attach knockout cover 9 to close knockout hole to prevent

rat or something strange from getting into the indoor unit.

9 Knockout cover

0 Screw for 9 4 × 10 mm

Cap for service port 13.7 to 17.7 140 to 180
Cap for stop valve 19.6 to 29.4 200 to 300

11

Tightening torque

N·mkgf·cm

Retighten the cap.

Leak test

6-5 TEST RUN

POWER

• Before performing the test run, recheck for any wrong wiring.
Wrong wiring prevents normal operation or results in blown fuse disabling operation.

• The test run can be initiated by using EMERGENCY OPERATION switch (press button switch). The EMER­GENCY OPERATION switch is pressed, the unit will start the test run (continuous operation) for 30 minutes
in COOL MODE or HEAT MODE, depending on which mode is selected. During this 30 minutes a thermostat
does not work. After 30 minutes the unit will start the EMERGENCY OPERATION at fixed temperature
setting of 24°C in COOL MODE or HEAT MODE.

6-6 AUTO RESTART FUNCTION

• These models are equipped with an auto restart function. If you do not want to use this function, please
consult the service representative because the setting of the unit needs to be changed.

• When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and
the fan speed are memorized by the indoor electronic control P.C. board. The auto restart function sets to
work the moment the power has restored after power failure, then, the unit will restart automatically. If the unit
is operated in “I FEEL...” or “AUTO ” mode before power failure, the operation mode (COOL, DRY or HEAT) is
not stored in the memory. When the main power is turned on, the unit decides the operation mode by the
initial room temperature at restart and starts operation again.

• Perform test run in the following procedure.

PROCEDURE

• Press the EMERGENCY OPERATION switch.

1 Press it once, and the EMERGENCY COOL

MODE starts.

EMERGENCY OPERATION switch

If the left side lamp of the operation indicator blinks
every 0.5 seconds, inspect the in/out connecting wire
B for mis-wiring.

2 Press it once more, and the EMERGENCY HEAT

MODE starts.

Mode

Operation indicator

lamp

3 Press it once more, and the operation stops.

COOL

(The operation mode changes in order of 1 - 3
every press of the EMERGENCY OPERATION
switch.)

1

HEAT

2

STOP

3

(Light) (Off)

(Off) (Light)

(Lights not turn on)

Checking the remote (infrared) signal reception

Press the ON/OFF button on the remote control and check that an electronic sound is heard from the indoor
unit. Press the ON/OFF button again to turn the air conditioner off.

If the indoor unit is operated with the remote control, both the trial and emergency operations are released
by commands from the remote control.

Operation

1 If the main power has been cut, the operation settings remain.
2 When three minutes have passed after power was restored, the unit will restart automatically according to

the memory.

Notes:

• The operation settings are memorized when 10 seconds have passed after the remote controller was oper­ated.

• If the main power is turned off or a power failure occurs while AUTO START/STOP timer is active, the timer
setting is cancelled. As these models are equipped with an auto restart function, the air conditioner starts
operating with timer cancelled at the same time that power is restored.

• If the unit has been off with the remote controller before power failure, the auto restart function does not work
as the power button of the remote controller is off.

• To prevent breaker off due to the rush of starting current, systematize other home appliances not to turn on
at the same time.

6-7 EXPLANATION TO THE CUSTOMER

• Using the instruction manual, explain the following to the customer how to control temperature, how to re­move the air filters, how to remove or put the remote controller in the remote controller holder, how to clean,
precautions, etc.

• Recommend the customer to carefully read the Operating Instruction Book.

• Once the compressor stops, the restart preventive device operates so the compressor will not operate for 3

minutes to protect the air conditioner.

12

7. FOR MOVEMENT AND MAINTENANCE

1

2

7-1 FRONT PANEL REMOVAL

1. Remove front grill.

• Remove 3 screws. (See to 4-1-(4)) (Page 5).

2. Remove front panel.

• Remove 10 screws as shown in the right.

• Unlock front panel by pulling it toward yourself (1) and then

pull it down as the arrow (2).

• After removing the front panel, it is possible to service many
parts.

Front panel

7-2 GAS CHARGE

1. Connect gas cylinder to the service port of stop valve (3-way).

2. Execute air purge of the pipe (or hose) coming from refrigerant gas cylinder.

3. Replenish specified amount of the refrigerant, while operating the air conditioner for cooling.

Note:
In case of adding refrigerant, comply with the quantity specified for the refrigerating cycle.

Caution:

• Do not discharge the refrigerant into the atmosphere.
Take care not to discharge refrigerant into the atmosphere during installation, reinstallation, or re­pairs to the refrigerant circuit.

• For additional charging, charge the refrigerant from liquid phase of the gas cylinder.
If the refrigerant is charged from the gas phase, composition change may occur in the refrigerant
inside the cylinder and the outdoor unit. In this case, ability of the refrigerating cycle decreases or
normal operation can be impossible. However, charging the liquid refrigerant all at once may cause
the compressor to be locked. Thus, charge the refrigerant slowly.

Lock

To maintain the high pressure of the gas cylinder, warm the gas cylinder with warm water (under 40°C) during
cold season. But never use naked fire or steam.

Union

Indoor unit

Refrigerant gas
cylinder operat­ing valve

Liquid pipe

Gas pipe

Gauge manifold
valve (for R410A)

Charge hose (for R410A)

Refrigerant gas cylinder for
R410A with siphon

Refrigerant (liquid)

Electronic scale for refrig­erant charging

Stop valve

Outdoor unit

Service port

13

This product is designed and intended for use in the residential,
commercial and light-industrial environment.

The product at hand is based on
the following EU regulations:

• Low Voltage Directive 73/23/ EEC

• Electromagnetic Compatibility Directive 89/

336/ EEC

HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

VN79A516H02