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

Floor Type Air-Conditioner

MFZ-KA25VA

MFZ-KA35VA

HFC

MFZ-KA50VA utilized

R410A

[FLARE CONNECTION TYPE]

INSTALLATION MANUAL

•This manual only describes the installation of indoor unit. When installing the outdoor unit, refer to the installation manual of outdoor unit.

	CONTENTS
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

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FOR INSTALLER

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.

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.

■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.

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 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. INSTALLATION DIAGRAM & ACCESSORIES

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<![if ! IE]> <![endif]>mm
		drain hose is not
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	7	raised.

100	mm
	or more

100	mm or
	more

		D
		C H
C
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	<![if ! IE]> <![endif]>floor	E
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B

F 2

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

Rear

Left-rear

Left

Left-Downward Downward

Lock the catch.

	3		Separate the 2 connecting pipes and ap-
			ply insulation individually.
	6
	SUZ-KA25/35 VA (H)		8 mm thickness thermal insula-
			tion plastic
			When the piping is to be attached to a
			wall containing metals (tin plated) or
			metal netting, use a chemically treated
		I	wooden piece 20 mm or thicker between
	A		the wall and the piping or wrap 7 to 8
			turns of insulation vinyl tape around the
			piping.

B

2

ACCESSORIES

Check the following parts before installation. <Indoor unit>

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

A	Indoor/outdoor unit connecting wire	1
	(4-core 1.5 mm2)
B	Extension pipe	1
C	Wall hole sleeve	1
D	Wall hole cover	1
E	Pipe fixing band	2 to 5
	(The quantity depends on the pipe length.)
F	Fixing screw for E 4 × 20 mm (The quantity	2 to 5
	depends on the pipe length.)
G	Piping tape	1
H	Putty	1
I	Drain hose (or soft PVC. hose, 15 mm inner dia.	1 or 2
	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

1Table 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
	KA25/35			9.52 mm	8 mm
For gas						0.045 specific gravity
	KA50			12.7 mm	8 mm

•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.

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

3Refrigerant 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.

3. SELECTING THE INSTALLATION LOCATION

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.

3

4. INDOOR UNIT INSTALLATION

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	(700)	Indoor unit mounting bracket 7
		131
		<![if ! IE]> <![endif]>14
		<![if ! IE]> <![endif]>586	<![if ! IE]> <![endif]>(600)	To prevent the indoor unit mounting bracket 7 from vi-
200
				brating 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.

Screws

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.

	674
<![if ! IE]> <![endif]>363	<![if ! IE]> <![endif]>333
	<![if ! IE]> <![endif]>210

4-4 CONNECTING WIRE SPECIFICATIONS

• Use special room air conditioning circuit.

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

Indoor terminal block

Outdoor terminal block

4-5 INDOOR AND OUTDOOR CONNECTING WIRE CONNECTION

You can connect indoor/outdoor lead wire without removing the front panel. 1Open the front panel.

2Remove two screws holding the cabinet, then remove the cabinet.

3Remove one screw holding the electrical cover, then remove the cover. 4Remove one screw holding the cord clamp, then remove the clamp.

5Pass the indoor/outdoor unit connecting wire and fix the wire to the terminal block.

6Secure the indoor/outdoor unit connecting wire and the earth wire with the cord clamp. 7Re-install the fixture and electrical cover securely.

Indoor terminal block

ELECTRICAL COVER

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.

Loosen terminal
screw.	15 mm
	35 mm

Lead wire

Terminal block

<Connection details>

Earth wire (green/yellow)

Indoor/outdoor unit connecting wire A 4-core 1.5 mm2

Caution:

•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)

4-6 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

1If the main power has been cut, the operation settings remain.

2When 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.

5

4-7 MAKING HOLES IN THE WALL AND FLOOR

MAKING HOLES

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

2Insert the wall hole sleeves C into the holes.

	Wall hole
		Wall thickness
	65 mm dia.	One scale
	(ø75 mm for KA50)

Cut with 1 extra scale length.

(Indoor side)

(Wall hole cross section)

Wall hole sleeve C

Caution:

Be sure to use the wall hole sleeves C. Otherwise, the indoor/outdoor unit connecting wires may contact 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					FOR RIGHT DOWNWARD OR LEFT DOWNWARD PIPING
(The following figure is a front view of the indoor					(The following figure is a view of the bottom of the indoor
unit installation location.)					unit from above.)
700						61	31
131	288	131			<![if ! IE]> <![endif]>200	<![if ! IE]> <![endif]>60	<![if ! IE]> <![endif]>73	<![if ! IE]> <![endif]>105	<![if ! IE]> <![endif]>147
<![if ! IE]> <![endif]>14						150			When the unit is
									installed on the wall.
						75
						168			When the unit is
						62			installed on the floor.
				<![if ! IE]> <![endif]>496		700
<![if ! IE]> <![endif]>600
					FOR LEFT PIPING		FOR RIGHT PIPING
			<![if ! IE]> <![endif]>80	<![if ! IE]> <![endif]>97
599		78	23

<![if ! IE]> <![endif]>60	<![if ! IE]> <![endif]>60
<![if ! IE]> <![endif]>19	<![if ! IE]> <![endif]>19
60	60

SEALING THE HOLES

• Use putty or a caulking compound to seal 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.

FOR RIGHT DOWNWARD PIPING

FOR PIPING OTHER THAN RIGHT DOWNWARD

Pipe covers 4

Bands 5

Bands 5

Remove the cover.

•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.

6

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.

	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	Felt tape B
	width of the felt tape B should not be
	more than 1/2 of the tape width.)

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

Fasten the end of the felt tape Bwith 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.

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	100 or more
Upper air outlet	Receiver	Indoor unit
	Grating
		100 or
	26 60
		more
<![if ! IE]> <![endif]>52	<![if ! IE]> <![endif]>65
	<![if ! IE]> <![endif]>14
<![if ! IE]> <![endif]>475
<![if ! IE]> <![endif]>65
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.

Control board

Cut

<![if ! IE]> <![endif]>JR24

<![if ! IE]> <![endif]>JRFBL

Cut the wires on both ends.

Cut the JR24 wires.

7

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.

Sloping downward

Fig. 1

End of drain hose is immersed in water.

Drainage channel

Fig. 4

No upward slope

Fig. 2

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

50 mm or less from ground

Fig. 5

Accumulated drain water

Air

Fig. 3

Drain hose

Flexible PVC

hose (inner

diameter: 15 mm) or rigid PVC pipe

(VP-16)

Fig. 6

•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.

•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.

200
50
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	Piping tape
waves in the hose.

•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

Refr igerant piping

Piping bent	Push
outward

4-11 FRONT PANEL INSTALLATION

1Open the horizontal vane for the upper air outlet.

2Fit the front panel onto the indoor unit from the front, and then push the upper and lower areas that are marked with arrows.

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

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

2

3

3

3	3
		3
2	3
	2	3	4
			2

8