Mitsubishi Electric M Z-C NA Series Manual de usuario

No. OBH802

REVISED EDITION-B

INDOOR UNIT

SERVICE MANUAL

Outdoor unit service manual

MXZ-C NA, MXZ-C NAHZ Series

(OBH702, OCH573)

PARTS CATALOG (OBB802)

CONTENTS

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

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

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

4. OUTLINES AND DIMENSIONS ························ 6

5. WIRING DIAGRAM············································ 7

6. REFRIGERANT SYSTEM DIAGRAM··············· 9

7. SERVICE FUNCTIONS ··································· 10

8. MICROPROCESSOR CONTROL ··················· 13

9. TROUBLESHOOTING····································· 22

10. DISASSEMBLY INSTRUCTIONS···················· 37

OBH802 REVISED EDITION-A is void.

Revision B:

• MLZ-KP09/12/18NA2- U1 have been added.

Models

MLZ-KP09NA -U1 MLZ-KP09NA2 -U1

MLZ-KP12NA -U1 MLZ-KP12NA2 -U1

MLZ-KP18NA -U1 MLZ-KP18NA2 -U1

1TECHNICAL CHANGES

MLZ-KP09NA- U1

MLZ-KP12NA- U1

MLZ-KP18NA- U1

1. New model

MLZ-KP09NA- U1 MLZ-KP09NA2- U1

MLZ-KP12NA- U1 MLZ-KP12NA2- U1

MLZ-KP18NA- U1 MLZ-KP18NA2- U1

1. Indoor electronic control P.C. board has been changed.

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.

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 pull 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.

Revision A:

• 5. WIRING DIAGRAM has been modified.

Revision B:

• MLZ-KP09/12/18NA2- U1 have been added.

WARNING

• When the refrigeration circuit has a leak, do not execute pump down with the compressor.

• When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.

The compressor may burst if air etc. get into it.

• When opening or closing the valve below freezing temperatures, refrigerant may spurt out from the gap

between the valve stem and the valve body, resulting in injuries.

OBH802B

PART NAMES AND FUNCTIONS2

ACCESSORIES MODELS MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA

MLZ-KP09NA2 MLZ-KP12NA2 MLZ-KP18NA2

Alkaline battery (AAA) for remote controller 2

Drain hose (with insulation) 1

Special washer (with cushion, 4pcs) 8

Installation template 1

Fixing screw for M5 х 30 mm 4

Band 1

Fixing screw for 4 х 16 mm 2

Remote controller 1

Remote controller holder 1

Fixing screw for 3.5 x 16 mm (Black) 2

INDOOR UNIT

MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA

MLZ-KP09NA2 MLZ-KP12NA2 MLZ-KP18NA2

Display section

Horizontal vane

Vertical vane

Air outlet

Air ﬁlter

(Air purifying ﬁlter)

Air inlet

Air cleaning ﬁlter

(Anti-Allergy Enzyme

filter, option)

Intake grille

Safety strings Spec name plate

Open the display cover Remote control receiving section

Emergency operation switch

Operation indicator lamp

OBH802B

3 SPECIFICATION

Indoor model MLZ-KP09NA

MLZ-KP09NA2 MLZ-KP12NA

MLZ-KP12NA2 MLZ-KP18NA

MLZ-KP18NA2

Power supply V, phase, Hz 208/230, 1, 60

Max. fuse size (time delay)/ Disconnect switch

A 15

Airow

High - Med. - Low - SLow

COOL Dry

(Wet)

CFM 311 - 283 - 254 - 212 332 - 297 - 258 - 212 403 - 346 - 293 - 212

HEAT Dry CFM 325 - 290 - 247 - 212 350 - 311 - 272 - 212 417 - 364 - 311 - 212

Sound level

High - Med. - Low - SLow Cooling dB (A) 38 - 34 - 31 - 27 40 - 36 - 32 - 27 47 - 41 - 36 - 29

Heating dB (A) 37 - 34 - 29 - 26 40 - 36 - 32 - 26 48 - 42 - 37 - 26

Cond. drain connection O.D. in. Ø1 (26 mm)

Dimensions Win. 43-3/8

D14-3/16

H7-5/16

Weight Ib. 34

External nish White

Control voltage (by built-in transformer) 12 - 24 V DC

NOTE: Test conditions are based on ARI 210/240.

1. Multi connection

Specifications and rated conditions of main electric parts

Model

Item MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA

MLZ-KP09NA2 MLZ-KP12NA2 MLZ-KP18NA2

Fuse (F11) T3.15AL250V

Horizontal vane motor (MV1) 12 V DC

Vertical vane motor (MV2) 12 V DC

Varistor (NR11) 470 V

DRAIN PUMP (DP) 230 V 6.4 W

FLOAT SENSOR (FS) 5 V DC

OBH802B

● The air coverage is the figure up to the

position where the air speed is 1 ft./s.,

when air is blown out horizontally from

the unit properly at the High speed posi-

tion.

The coverage should be used only as a

general guideline since it varies accord-

ing to the size of the room and furniture

arranged inside the room.

3-2. OUTLET AIR SPEED AND COVERAGE

Multi connection

Model Mode Function Airow

(CFM) Air speed

(ft./s.)

Coverage

(ft.)

MLZ-KP09NA

MLZ-KP09NA2

HEAT Dry 311 13.0 20.7

COOL Dry 325 13.6 21.7

Wet ———

MLZ-KP12NA

MLZ-KP12NA2

HEAT Dry 332 13.9 22.1

COOL Dry 350 14.6 23.3

Wet ———

MLZ-KP18NA

MLZ-KP18NA2

HEAT Dry 403 16.9 26.7

COOL Dry 417 17.5 27.6

Wet ———

(2) OPERATION

*The operating range of the outdoor unit depends on the connected outdoor unit.

Mode Condition Intake air temperature (°F)

Indoor Outdoor

DB WB DB WB

Cooling

Standard temperature 80 67 95 —

Maximum temperature 90 73 115 —

Minimum temperature 67 57 14 —

Maximum humidity 78% —

Heating Standard temperature 70 60 47 43

Maximum temperature 80 67 75 65

Minimum temperature 70 60 -13 -14

3-1. OPERATING RANGE

(1) POWER SUPPLY

Rated voltage Guaranteed voltage (V)

Indoor unit 208/230 V

1 phase

60 Hz

Min. 187 208 230 Max. 253

OBH802B

4OUTLINES AND DIMENSIONS

Unit: inch

INDOOR UNIT

MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA

MLZ-KP09NA2 MLZ-KP12NA2 MLZ-KP18NA2

OBH802B

WIRING DIAGRAM5

INDOOR UNIT

MLZ-KP09NA- U1

MLZ-KP12NA- U1

M M

FROM OUTDOOR UNIT

CONNECTING WIRES

(POWER SUPPLY)

208/230V AC 60Hz

TO OUTDOOR UNIT

CONNECTING WIRES

CN125

DISP

P.C.BOARD CN302

CN106

NR11

CN202

3 5 5

MF MS

910

MV1 MV2

CN301

CN145

CN201

LD103

CN112

CN111

F11

CN211

CN151

RT13

RT12

RT11

1CN1N1

1 3

X11

BK BU

INDOOR ELECTRONIC

CONTROL P.C. BOARD

REC

P.C.BOARD

R111

1CN1M1

222

CN24

CN105

TO OUTDOOR UNIT

CONNECTING WIRES

12-24V

RESISTOR

COIL TEMP.

THERMISTOR(MAIN)

COIL TEMP.

THERMISTOR(SUB)

VARISTOR

RT13

RT12

NR11

FUSE

(T3.15AL250V)

DRAIN PUMP

FLOAT SENSOR

HORIZONTAL

VANE MOTOR

VERTICAL

VANE MOTOR

TERMINAL

BLOCK

MV1

MV2

F11

RELAYX11

ROOM TEMP.

THERMISTOR

SYMBOL SYMBOL

MF FAN MOTOR RT11

R111

NAME

A disconnect should be

required by local code.

Se procurer un

sectionneur conforme aux

réglementations locales.

NOTES :

1.About the outdoor side electric wiring

refer to the outdoor unit electric wiring

diagram for servicing.

2.Use copper conductors only.

(For field wiring)

3.Symbols below indicate.

: Terminal

block : Connector

: Borne : Connecteur

REMARQUES :

1.Pour le câblage électronique côté

extérieur, se reporter au schéma

d'entretien du câblage électronique

de l'appareil extérieur.

2.Utiliser des fils d'alimentation en cuivre.

3.Les symboles ont les significations

suivantes

MLZ-KP09NA2- U1

MLZ-KP12NA2- U1

OBH802B

MLZ-KP18NA- U1

M M

CN125

DISP

P.C.BOARD CN302

NR11

CN202

3 5 5

MF MS

910

MV1 MV2

CN301

CN145

CN201

LD103

CN112

CN111

F11

CN211

CN151

RT13

RT14

RT12

RT11

1CN1N1

1 3

X11

INDOOR ELECTRONIC

CONTROL P.C. BOARD

REC

P.C.BOARD

R111

1CN1M1

222

CN24

CN105

RT15 1

CN113

CN106

RESISTOR

COIL TEMP.

THERMISTOR(MAIN1)

COIL TEMP.

THERMISTOR(MAIN2)

COIL TEMP.

THERMISTOR(MAIN3)

COIL TEMP.

THERMISTOR(SUB)

VARISTOR

RT13

RT12

RT15

RT14

NR11

FUSE

(T3.15AL250V)

DRAIN PUMP

FLOAT SENSOR

HORIZONTAL

VANE MOTOR

VERTICAL

VANE MOTOR

TERMINAL

BLOCK

MV1

MV2

F11

RELAYX11

ROOM TEMP.

THERMISTOR

SYMBOL SYMBOL

MF FAN MOTOR RT11

R111

NAME

A disconnect should be

required by local code.

Se procurer un

sectionneur conforme aux

réglementations locales.

REMARQUES :

1.Pour le câblage électronique côté

extérieur, se reporter au schéma

d'entretien du câblage électronique

de l'appareil extérieur.

2.Utiliser des fils d'alimentation en cuivre.

3.Les symboles ont les significations

suivantes

NOTES :

1.About the outdoor side electric wiring

refer to the outdoor unit electric wiring

diagram for servicing.

2.Use copper conductors only.

(For field wiring)

3.Symbols below indicate.

FROM OUTDOOR UNIT

CONNECTING WIRES

(POWER SUPPLY)

208/230V AC 60Hz

TO OUTDOOR UNIT

CONNECTING WIRES

TO OUTDOOR UNIT

CONNECTING WIRES

12-24V

: Terminal

block : Connector

: Borne : Connecteur

MLZ-KP18NA2- U1

OBH802B

REFRIGERANT SYSTEM DIAGRAM6

Indoor

heat

exchanger

Flared connection

Room temperature

thermistor

RT11

Indoor coil

thermistor

RT13 (sub)

Flared connection

Refrigerant pipe Ø3/8(Ø9.52)

(with heat insulator)

Refrigerant pipe Ø1/4(Ø6.35)

(with heat insulator)

Indoor coil

thermistor

RT12 (main)

Indoor

heat

exchanger

Flared connection

Room temperature

thermistor

RT11

Indoor coil

thermistor

RT13 (sub)

Flared connection

Refrigerant flow in cooling

Refrigerant flow in heating

Refrigerant pipe Ø1/2(Ø12.7)

(with heat insulator)

Refrigerant pipe Ø1/4(Ø6.35)

(with heat insulator)

Indoor coil

thermistor

RT12,RT14,

RT15 (main)

INDOOR UNIT

Unit: inch(mm)

MLZ-KP09NA

MLZ-KP12NA

MLZ-KP09NA2

MLZ-KP12NA2

MLZ-KP18NA

MLZ-KP18NA2

OBH802B

7SERVICE FUNCTIONS

7-1. TIMER SHORT MODE

• For service, the following set time can be shortened by bridging the timer short mode point on the electronic control P.C.

board. (Refer to 9-7.)

• 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 3

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

Table 1

7-2. 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

STOP/OPERATE (OFF/ON) 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.

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 9-7.)

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

C111

IC101

JR05

JR06

MLZ-KP09NA MLZ-KP12NA MLZ-KP18NA

MLZ-KP09NA2 MLZ-KP12NA2 MLZ-KP18NA2

OBH802B

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