Mitsubishi Electric MFZ-KJ25VE Manuale utente

CONTENTS

1. TECHNICAL CHANGES ··································· 2

2. PART NAMES AND FUNCTIONS····················· 3

3. SPECIFICATION················································ 4

4. NOISE CRITERIA CURVES······························ 5

5. OUTLINES AND DIMENSIONS ························ 6

6. WIRING DIAGRAM············································ 7

7. REFRIGERANT SYSTEM DIAGRAM··············· 8

8. SERVICE FUNCTIONS ····································· 9

9. MICROPROCESSOR CONTROL ····················11

10. TROUBLESHOOTING····································· 18

11. DISASSEMBLY INSTRUCTIONS···················· 31

SPLIT-TYPE AIR CONDITIONERS

NOTE:

• This service manual describes technical data of the indoor units.

• RoHS compliant products have <G> mark on the spec name plate.

For servicing of RoHS compliant products, refer to the RoHS Parts List.

SERVICE MANUAL

Models

No. OBH666

REVISED EDITION-A

INDOOR UNIT

MFZ-KJ25VE -E1

MFZ-KJ35VE -E1

MFZ-KJ50VE -E1

Outdoor unit service manual

MUFZ-KJ•VE Series (OBH667)

MUFZ-KJ•VEHZ Series (OBH668)

Please void OBH666.

Revision A:

• MFZ-KJ50VE- E1 has been added.

1TECHNICAL CHANGES

MFZ-KJ25VE- E1

MFZ-KJ35VE- E1

MFZ-KJ50VE- E1

1. New model

With the horizontal vanes and the multi-flow vane, air blows to the expanded vertical area using only one fan.

These models are compatible with the outdoor units with low standby power control.

Connecting these models to the MUFZ-KJ·VE(HZ) series outdoor units enables the low standby power control. Low standby

power control can reduce standby power about 90%.

Refer to the technical guide (OBT17) about the low standby power control.

Prepare the proper tools.

Prepare the proper protectors.

Provide adequate ventilation.

After stopping the operation of the air conditioner, turn off the power-supply breaker and remove the power plug.

Discharge the capacitor before the work involving the electric parts.

Do not perform the work involving the electric parts with wet hands.

Do not pour water into the electric parts.

Do not touch the refrigerant.

Do not touch the hot or cold areas in the refrigeration cycle.

When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to

touch the live parts.

Use the speciﬁed refrigerant only

Never use any refrigerant other than that specified.

Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.

Correct refrigerant is specified in the manuals and on the spec labels provided with our products.

We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by

failure to follow the instructions.

Revision A:

• MFZ-KJ50VE- E1 has been added.

OBH666A

2PART NAMES AND FUNCTIONS

MFZ-KJ25VE

MFZ-KJ35VE

MFZ-KJ50VE

E.O

Display and operation section (When the front panel is opened)

Operation indicator lamp

Emergency operation

switch

Remote control receiving section

Fan guard

Air outlet

Air cleaning ﬁlter

(Anti-Allergy

Enzyme Filter)

Air ﬁlter

(Nano platinum ﬁlter)

Panel

Front panel

Horizontal vane

Vertical vane

Multi-ﬂow vane

ACCESSORIES

Remote controller holder

Fixing screw for 3.5 x 16 mm (Black)

Pipe cover

Band

Battery (AAA) for remote controller

Indoor unit mounting bracket

Fixing screw for 4 x 25 mm

Wood screw for the indoor unit fixation

Washer of

Felt tape (Used for left or left-rear piping)

Wireless remote controller

Air cleaning filter

MFZ-KJ25VE

MFZ-KJ35VE

MFZ-KJ50VE

OBH666A

3SPECIFICATION

Indoor model MFZ-KJ25VE MFZ-KJ35VE MFZ-KJ50VE

Power supply Single phase 230 V, 50 Hz

Electrical

data

Power input 1 Cooling W13 21

Heating 16 38

Running current

Cooling A0.14 0.20

Heating 0.17 0.34

Fan

motor

Model RC0J30-KX RC0J40-PA

Current 1 Cooling A0.14 0.20

Heating 0.17 0.34

Dimensions W × H × D mm 750 × 600 × 215

Weight kg 15

Special remarks

Air direction 1 FLOW: 4, 2 FLOW: 4

Airﬂow

Cooling

Super High

m3/h

492 636

High 426 558

Med. 354 480

Low 294 402

Silent 234 336

Heating

Super High

m3/h

582 840

High 462 696

Med. 372 564

Low 306 444

Silent 234 360

Sound level

Cooling

Super High

dB(A)

39 44

High 35 39

Med. 30 35

Low 25 31

Silent 20 27

Heating

Super High

dB(A)

41 50

High 35 45

Med. 30 40

Low 25 35

Silent 19 29

Fan speed

Cooling

Super High

rpm

790 980

High 700 880

Med. 600 770

Low 520 670

Silent 440 580

Heating

Super High

rpm

910 1,250

High 750 1,060

Med. 630 890

Low 540 750

Silent 440 610

Fan speed regulator 5

Remote controller model SG132

NOTE: Test conditions are based on ISO 5151.

Cooling: Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C

Outdoor Dry-bulb temperature 35°C

Heating: Indoor Dry-bulb temperature 20°C

Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C

1 Measured under rated operating frequency.

Specifications and rating conditions of main electric parts

Model

Item MFZ-KJ25VE MFZ-KJ35VE MFZ-KJ50VE

Fuse (F11) T3.15AL250V

Horizontal vane motor (Front) (MV1) 12 VDC 250 Ω

Horizontal vane motor (Back) (MV2) 12 VDC 250 Ω

Multi-ﬂow vane motor (MV3) 12 VDC 350 Ω

Terminal block (TB) 3P

Varistor (NR11) S10K300E2K1

OBH666A

4NOISE CRITERIA CURVES

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

063 125 250 500 1000 2000 4000 8000

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

Test conditions

Cooling : Dry-bulb temperature 27 °C Wet-bulb temperature 19 °C

COOLING

FUNCTION

SPL(dB(A)) LINE

Super High

FAN SPEED

HEATING

Heating : Dry-bulb temperature 20 °C

063 125 250 500 1000 2000 4000 8000

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

COOLING

FUNCTION

SPL(dB(A)) LINE

Super High

FAN SPEED

HEATING

NC-10

MFZ-KJ25VE

INDOOR UNIT

WALL

MICROPHONE

MFZ-KJ35VE

MFZ-KJ50VE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

063 125 250 500 1000 2000 4000 8000

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

COOLING

FUNCTION

SPL(dB(A)) LINE

Super High

FAN SPEED

HEATING

NC-10

OBH666A

OUTLINES AND DIMENSIONS

Unit: mm

MFZ-KJ25VE

MFZ-KJ35VE

MFZ-KJ50VE

OBH666A

6WIRING DIAGRAM

MFZ-KJ25VE

MFZ-KJ35VE

MFZ-KJ50VE

OBH666A

REFRIGERANT SYSTEM DIAGRAM

Indoor

heat

exchanger

Flared connection

Room temperature

thermistor

RT11

Indoor coil

thermistor

RT14, RT15

(main)

RT13 (sub)

Flared connection

Refrigerant flow in cooling

Refrigerant flow in heating

Refrigerant pipe 9.52 (MFZ-KJ25/35)

12.7 (MFZ-KJ50)

(with heat insulator)

Refrigerant pipe 6.35

(with heat insulator)

Indoor coil

thermistor

RT12 (main)

Distributor

Unit: mm

MFZ-KJ25VE

MFZ-KJ35VE

MFZ-KJ50VE

OBH666A

SERVICE FUNCTIONS

8-1. TIMER SHORT MODE

For service, the following set time can be shortened by short circuiting the timer short mode point on the electronic control

P.C. board. (Refer to 10-7.)

The set time for the ON/OFF timer can be reduced to 1 second for each minute.

After the breaker is turned on, the time for starting the compressor, which normally takes 3 minutes, can be reduced to 1

minute. Restarting the compressor, which takes 3 minutes, cannot be reduced.

•

MFZ-KJ25VE

MFZ-KJ35VE

MFZ-KJ50VE

1. How to modify the electronic control P.C. board

Turn OFF the power supply before modification. To assign a number to each indoor unit , cut off “JR05” and “JR06” on the

electronic control P.C. board as shown in Table 1. (Refer to 10-7.)

Unit No. 1

Unit No. 2

Unit No. 3

Unit No. 4

JR05

No modification

Cut off JR05

No modification

Cut off JR05

JR06

No modification

Cut off JR06

Table 1

CN211

Fuse (F11)

VARISTOR (NR11)

Indoor electronic

control P.C. Board

CN151

JR05

JR06

R111

8-2. HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT

A maximum of 4 indoor units with wireless remote controllers can be used in a room.

To operate the indoor units individually with each remote controller, assign a number to each remote controller according

to the number of the indoor unit.

This setting can be set only when all the following conditions are met:

• The remote controller is powered OFF.

• Weekly timer is not set.

• Weekly timer is not being edited.

2. How to set the remote controller

(1) Hold down button on the remote controller for 2 seconds to enter the pairing mode.

(2) Press button again and assign a number to each remote controller.

Each press of button advances the number in the following order: 1 →2 →3 →4.

(3) Press button to complete the pairing setting.

After the setting, turn ON the power supply and with the remote controller headed towards the indoor unit, press the

OPERATE/STOP (ON/OFF) button. If 1 or 2 beeps is heard from the indoor unit, the setting is completed correctly.

The remote controller that first sends a signal to an indoor unit will be regarded as the remote controller for the indoor

unit.

Once they are set, the indoor unit will only receive the signal from the assigned remote controller afterwards.

OBH666A

1010

CN123

CN105

CN104

CN111

CN211

T111

C111

L101

CN201 F11

JR77

NOTE:

• The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote

controller.

• If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is can-

celled.

• 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 appliance not to turn ON at the

same time.

• When some air conditioners are connected to the same supply system, if they are operated before power failure, the

starting current of all the compressors may flow simultaneously at restart.

Therefore, the special counter measures are required to prevent the main voltage-drop or the rush of the starting cur-

rent by adding to the system that allows the units to start one by one.

8-3. AUTO RESTART FUNCTION

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. “AUTO RESTART FUNCTION” automatically starts operation

in the same mode just before the shutoff of the main power.

Operation

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

After the power is restored, the unit restarts automatically according to the memory.

(However, it takes at least 3 minutes for the compressor to start running.)

How to disable “AUTO RESTART FUNCTION”

Turn off the main power for the unit.

Cut the Jumper wire to JR77 on the indoor electronic control P.C. board. (Refer to 10-7.)

OBH666A

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