Mitsubishi Electric MFZ-KA50VA, MFZ-KA35VA, MFZ-KA25VA INSTALLATION MANUAL

Floor Type Air-Conditioner

HFC

utilized

R410A

English

CONTENTS

MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA

[FLARE CONNECTION TYPE]

INSTALLATION MANUAL

1. THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR

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

2. INSTALLATION DIAGRAM & ACCESSORIES ................................ 2

3. SELECTING THE INSTALLATION LOCATION ................................ 3

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

5. INDOOR/OUTDOOR UNIT CONNECTION FINISHING AND

TEST RUN ....................................................................................... 9

6. FOR MOVEMENT AND MAINTENANCE...................................... 11

Deutsch

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∂ППЛУИО¿

Português

Dansk

• This manual only describes the installation of indoor unit.

When installing the outdoor unit, refer to the installation manual of outdoor unit.

FOR INSTALLER

Svenska

Türkçe

Русский

1. THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR 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.

2. INSTALLATION DIAGRAM & ACCESSORIES

100 mm or more

Be careful the drain hose is not raised.

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.

Caution

■ 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.

■ 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.

SUZ-KA25/35 VA (H)

100 mm or more

150 mm or below

from the floor

Piping can be directed towards rear, right, downward, left or left-rear directions.

Left

Left-Downward

Separate the 2 connecting pipes and apply insulation individually.

8 mm thickness thermal insulation plastic

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.

Left-rear

Lock the catch.

Rear

Downward

3. SELECTING THE INSTALLATION LOCATION

ACCESSORIES

Check the following parts before installation.

1 Drain hose 1 2 Remote controller holder 1 3 Fixing screw for 2 3.5 × 16 mm (Black) 2 4 Pipe cover 1 5 Band 2 6 Battery (AAA) for remote controller 2 7 Indoor unit mounting bracket 1 8 Fixing screw for 7 4 × 25 mm 5 9 Wood screw for the indoor unit fixation 4 0 Washer of 9 4 A Felt tape (Used for left or left-rear piping) 1 B Wireless remote controller 1 C Air cleaning filter 1

PART TO BE PROVIDED AT YOUR SIDE

Optional extension pipe

Indoor/outdoor unit connecting wire

(4-core 1.5 mm

B Extension pipe 1 C Wall hole sleeve 1 D Wall hole cover 1

Pipe fixing band

(The quantity depends on the pipe length.) Fixing screw for E 4 × 20 mm (The quantity

depends on the pipe length.)

G Piping tape 1 H Putty 1

Drain hose (or soft PVC. hose, 15 mm inner dia.

or hard PVC pipe VP16)

J Refrigeration oil 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.

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

For gas

KA25/35 9.52 mm 8 mm KA50 12.7 mm 8 mm

Heat resisting foam plastic

0.045 specific gravity

2 to 5

1 or 2

3-1 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 (for 25/35) 30 m (for 50) and the difference of height of both units is 12 m (for 25/35) 15 m (for 50).

• 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.

3-2 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 3 to a pillar or wall, then set the wireless remote controller 6.

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

• Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm (for ø6.35 and ø9.52) or 1.0 mm (for ø12.7). Never use any pipe with a thickness less than 0.8 mm (for ø6.35 and ø9.52) or 1.0 mm (for ø12.7), 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.

4. INDOOR UNIT INSTALLATION

674

333

363

210

4-1 INDOOR UNIT MOUNTING BRACKET INSTALLATION

• Install the bracket firmly to the wall structure (stud, etc.).

• Use a level to install the mounting bracket horizontally.

• Install the indoor unit 150 mm or below from the floor.

131

200

(700)

Indoor unit mounting bracket 7

131

586

(600)

To prevent the indoor unit mounting bracket 7 from vibrating slightly, be sure to fasten the bracket at the holes indicated by b. In addition, fasten the bracket at the holes indicated by f if possible.

4-2 INDOOR UNIT PREPARATION

• Press the 2 positions indicated by the arrows e and open the front grille.

• Open the front grille and remove the two screws.

• Open the horizontal vane for the upper air outlet, push the top of the front panel in three locations, and then

pull the top of the grille away from the indoor unit.

• Lift up the front grille to remove it.

4-3 INDOOR UNIT INSTALLATION

• Hook the top of the indoor unit on the indoor unit mounting bracket 7.

• Use the included wood screws 9 and washer 0, and fasten the indoor unit at 2 locations(e) each at the top

and the middle of the unit.

4-4 CONNECTING WIRE SPECIFICATIONS

• Use special room air conditioning circuit.

Screws

Indoor/outdoor unit connecting Cable 4-core 1.5 mm2, in conformity wire Specification with Design 245 IEC 57.

Warning:

Never cut the indoor and outdoor unit connecting wire and connect it to other wires. It may cause a fire.

4-5 INDOOR AND OUTDOOR CONNECTING WIRE CONNECTION

You can connect indoor/outdoor lead wire without removing the front panel.

1 Open the front panel. 2 Remove two screws holding the cabinet, then remove the cabinet. 3 Remove one screw holding the electrical cover, then remove the cover. 4 Remove one screw holding the cord clamp, then remove the clamp. 5 Pass the indoor/outdoor unit connecting wire and fix the wire to the terminal block. 6 Secure the indoor/outdoor unit connecting wire and the earth wire with the cord clamp. 7 Re-install the fixture and electrical cover securely.

Indoor terminal block

ELECTRICAL COVER

4-6 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 “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.

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.

Fixing screw

Cord clamp

Never fail to hook the right claw on the VA clamp to secure indoor/outdoor unit connecting wire A.

Securely push the wire into the terminal block until no part of its core is appeared.

Indoor/outdoor unit connecting wire A

Warning:

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

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

Indoor terminal block

Earth wire (green/yellow)

Indoor/outdoor unit connecting wire A 4-core 1.5 mm

Terminal block

Loosen terminal screw.

Lead wire

15 mm

35 mm

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.

Caution:

Outdoor terminal block

• Be careful 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.

• If the connecting wire is incorrectly connected to the terminal block, the unit does not operate normally.

• If an earth is incorrect, it may cause an electric shock.

• Make earth wire a little longer than the others. (more than 55 mm)

4-7 MAKING HOLES IN THE WALL AND FLOOR

MAKING HOLES

1 Make ø65 mm holes (ø75 mm for KA50) that are approximately 5–7 mm deep and angled slightly downward

outward from the room.

2 Insert the wall hole sleeves C into the holes.

4-8 PIPING INSTALLATION

CONNECTING PIPE INSTALLATION

• Install the connecting pipes so that the piping can move slightly to the front, back, left, and right.

Wall hole

65 mm dia. (ø75 mm for KA50)

(Indoor side)

(Wall hole cross section)

Wall thickness

One scale

Wall hole sleeve C

Cut with 1 extra scale length.

Caution:

Be sure to use the wall hole sleeves

C. Otherwise, the indoor/outdoor unit connecting wires may con-

tact a metal object in the wall or, in the case of hollow walls, small rodents may gnaw on the wires, resulting in a very dangerous situation.

DETERMINING HOLE POSITIONS

• The areas where the piping can be routed are indicated with oblique lines in the figure.

FOR REAR OR LEFT-REAR PIPING (The following figure is a front view of the indoor

unit installation location.)

131

600

700

288

131

496

FOR RIGHT DOWNWARD OR LEFT DOWNWARD PIPING (The following figure is a view of the bottom of the indoor

unit from above.)

200

150

168

700

FOR LEFT PIPING

FOR RIGHT PIPING

105

147

When the unit is installed on the wall.

When the unit is installed on the floor.

FOR RIGHT DOWNWARD PIPING

Pipe covers 4

Bands 5

Remove the cover.

FOR PIPING OTHER THAN RIGHT DOWNWARD

Bands 5

• Be sure to insulate the connecting pipes and place them near the rear of the indoor unit so that they do not contact the front panel.

• Be careful not to crush the connecting pipes when bending them.

599

2378

SEALING THE HOLES

• Use putty or a caulking compound to seal the holes.

19 60

FOR LEFT OR LEFT-REAR PIPING Bundle the connecting pipes and drain hose together, and then wrap them in felt tape B.

Make sure that the drain hose is not routed upward.

Start wrapping the piping tape D around the pipes and hose 10 mm inside the indoor unit.

4-9 EMBEDDING THE INDOOR UNIT IN A WALL

• When installing a grating, use a grating with narrow upper and lower horizontal bars so that the airflow from the upper and lower air outlets does not contact the bars. If the horizontal bars will block the lower air outlet, use a stand, etc., to adjust the height of the indoor unit. If the upper or lower air outlet is blocked, the air conditioner will not be able to cool or warm the room well.

• Do not block the receiver with the grating. Otherwise, the grating will interfere with the remote controller signal and significantly reduce the distance and area (angle) from which the signals can be received.

• Use a grating with vertical bars, etc., that has at least 75% open area. If the grating has horizontal bars or if the open area is less than 75%, performance could be reduced.

• When the indoor unit is embedded in a wall (built-in), the time it takes for the room temperature to reach the set temperature will increase.

100 or more

Upper air outlet

Receiver

100 or more

6026

6514

Grating

100 or

Indoor unit

Wrap the felt tape B tightly around the pipes and hose starting near where the pipes and hose are routed from the indoor unit. (The overlap width of the felt tape B should not be more than 1/2 of the tape width.)

Felt tape B

Fasten the end of the felt tape B with a bandage stopper.

Cut and use the lower side panels on the left and right sides of the indoor unit as shown below. Smooth the cut edges of the side panels so that they will not damage the insulation coating.

• For left or right piping

• Installing flush against a wall with molding

Molding

Cut the lower side panels to match the height of the molding.

475

Lower air outlet

35 or more

EMBEDDED INDOOR UNIT SETTING (MUST BE PERFORMED)

• When embedding the indoor unit in a wall, restrict the movement of the horizontal vane for the upper air outlet so that it only operates horizontally.

• If this setting is not performed, heat will build up in the wall and the room will not be cooled or warmed properly.

• Cut the wires on the left and right sides of JR24 using a pair of nippers, etc., as shown below.

Cut

Cut the wires on both ends.

Control board

JRFBL

JR24

Cut the JR24 wires.

4-10 DRAIN PIPING

• Be sure to route the drain piping slightly downward so that the drain water flows easily. (Fig. 1) Do not route the drain piping as shown in Fig. 2 to 5.

• When routing the drain piping, make sure that the drain hose 1 is routed as shown. (Fig. 7)

• Insert the drain hose all the way to the base of the drain pan. (Fig. 8)

Make sure that the drain hose is securely caught on the projection in the hole in the drain pan.

Sloping downward

No upward slope

Accumulated drain water

Air

Fig. 1 Fig. 2 Fig. 3

If the drain hose is routed indoors, be sure to wrap it

End of drain hose is immersed in water.

Fig. 4

Drainage channel

in commercially-available insulation.

50 mm or less from ground

Fig. 5

Fig. 6

Drain hose

Flexible PVC hose (inner diameter: 15 mm) or rigid PVC pipe (VP-16)

• If the drain hose is too short, refer to Fig. 6 to extend the length of the hose.

• If the indoor unit is installed in a high location such as a high-rise apartment, strong winds may cause the

drain water to flow back through the drain hose and leak from the unit. If necessary, contact your nearest Mitsubishi Electric representative for the optional parts to prevent this problem.

• If the drain hose is routed indoors, be sure to wrap it in commercially-available insulation.

• If embedding the piping in a wall, remove the lower side panels on the left and right sides of the indoor unit

when connecting the drain hose.

• Do not connect the drain piping directly to a septic tank, sewage tank, etc., where ammonia gases or hydrogen sulfide are produced.

• If there is slack in the drain hose or the end of the drain hose is raised up, the drain water may not flow smoothly and some drain water may collect in the hose. This can lead to a strange sound (burbling) being produced during strong winds or when a ventilation fan, etc., is used in a residence that is well-sealed. If necessary, contact your nearest Mitsubishi Electric representative for the optional parts to prevent this problem.

200

Fig. 7 Fig. 8

• Route the drain hose diagonally below the connecting pipes.

• Make sure that the drain hose is not routed upward and that there are no

waves in the hose.

Piping tape

Refrigerant piping

• Do not pull the drain hose, and then wrap tape around it.

• Route the piping so that it does not project past the rear of the indoor unit.

(Refer to the figure to the right.)

Drain hose

Piping bent outward

Push

4-11 FRONT PANEL INSTALLATION

1 Open the horizontal vane for the upper air outlet. 2 Fit the front panel onto the indoor unit from the front, and then push the upper and lower areas that are

marked with arrows.

3 Push the areas below the upper air outlet and the areas above and below the lower air outlet that are marked

with arrows.

4 After installing the front panel, install the 2 screws below the upper air outlet.

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