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No. OBH802

REVISED EDITION-A

Models

MLZ-KP09NA

MLZ-KP12NA

MLZ-KP18NA

INDOOR UNIT

MLZ-KP09NA
MLZ-KP12NA
MLZ-KP18NA

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 ··············· 8

7. SERVICE FUNCTIONS ····································· 9

8. MICROPROCESSOR CONTROL ··················· 12

9. TROUBLESHOOTING ····································· 21

10. DISASSEMBLY INSTRUCTIONS ··················· 35

OBH802 is void.

Revision A:

• 5. WIRING DIAGRAM has been modified.

sandium.com

Содержание MLZ-KP09NA

Страница 1: ...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 8 7 SERVICE FUNCTIONS 9 8 MICROPROCESSOR CONTROL 12 9 TROUBLESHOOTING 21 10 DISASSEMBLY INSTRUCTIONS 35 OBH802 is void Revision A 5 WIRING DIAGRAM has been modified sandium com ...

Страница 2: ... repair service 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 Precautions during the repair service Do not perform the work involving the electric parts with wet hands Do not pour w...

Страница 3: ...or 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 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 Emerg...

Страница 4: ...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 W in 43 3 8 D 14 3 16 H 7 5 16 Weight Ib 34 External finish 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 Fuse ...

Страница 5: ...325 13 6 21 7 Wet MLZ KP12NA HEAT Dry 332 13 9 22 1 COOL Dry 350 14 6 23 3 Wet MLZ KP18NA 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 Maximu...

Страница 6: ...6 OUTLINES AND DIMENSIONS 4 Unit inch INDOOR UNIT MLZ KP09NA MLZ KP12NA MLZ KP18NA OBH802A sandium com ...

Страница 7: ...imentation en cuivre 3 Les symboles ont les significations suivantes MLZ KP18NA U1 M M t t t t t M 1 S3 S2 S1 CN125 1 5 DISP P C BOARD CN302 6 NR11 3 1 CN202 3 5 5 6 1 MF MS 3 5 1 1 2 1 9 10 MV1 MV2 CN301 DP CN145 CN201 LD103 6 CN112 1 CN111 1 3 1 3 F11 U CN211 CN151 RT13 RT14 RT12 RT11 TB 2 1 CN1N1 1 3 X11 BU BU RD INDOOR ELECTRONIC CONTROL P C BOARD BK REC P C BOARD R111 1 1 3 3 2 2 7 1 CN1M1 2 ...

Страница 8: ...t 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 M...

Страница 9: ...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 pre...

Страница 10: ...t restart Therefore the special counter measures are required to prevent the main voltage drop or the rush of the starting current by adding to the system that allows the units to start one by one C111 JR77 IC101 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 9 7 Operation If the main power h...

Страница 11: ...rical cover 1 Electrical cover 2 Electronic control P C board Slide switch SW3 Normal Up Increase airflow volume 7 4 P C BOARD MODIFICATION FOR CHANGING AIRFLOW VOLUME How to change Slide switch SWV1 setting Factory setting is normal 1 Make sure that the breaker for air conditioner is turned OFF 2 Remove the electrical cover 1 and 2 of the indoor unit 3 Slide out the electronic control P C board a...

Страница 12: ...e room temperature is approaching the set tem perature About 2 to 4 F 1 to 2 C from set temperature Standby mode Refer to multi system operation Lit Blinking Not lit Signal transmitting section Battery replacement indicator Operation display section Temperature buttons STOP OPERATE OFF ON button Indication of remote controller model is on back FAN SPEED CONTROL button OPERATION SELECT button ECONO...

Страница 13: ...th a beep tone 2 Select HEAT mode with OPERATION SELECT button 3 Press TEMPERATURE buttons TEMP or button to select the desired temperature The setting range is 50 F 10 C and 61 88 F 16 31 C 1 Cold air prevention control When the compressor is not operating or is starting and the temperature of indoor heat exchanger and or the room tem perature is low or when defrosting is being done the indoor fa...

Страница 14: ...icroprocessor 2 The horizontal vane angle and mode change as follows by pressing VANE CONTROL button NOTE The setting when the higher airflow is preferred in the Airflow direction 1 The angle of airflow direction 1 can be slightly heightened by changing SWV1 to up Refer to 7 5 P C BOARD MODIFICATION FOR CHANGING AIRFLOW DIRECTION ADJUSTMENT However it may cause the dirt on the ceiling Factory sett...

Страница 15: ...water level above fixed point during a HEAT operation b emergency HEAT operation c standby when during multi system operation d standby when ON timer is set e operation STOP Drain pump operates in conditions 1 or 2 Operation stop condition Condition other than 1 or 2 indicated above 2 Float sensor Float moves with the up and down of water surface inside the drain pan and judges water level Fixed p...

Страница 16: ... setting a Press OFF TIMER button during operation b Set the time of the timer using TIME SET buttons and Each time FORWARD button is pressed the set time increases by 10 minutes each time BACKWARD but ton is pressed the set time decreases by 10 minutes 2 To release the timer To release ON timer press ON TIMER button To release OFF timer press OFF TIMER button TIMER is cancelled and the display of...

Страница 17: ...ature blinks Pressing selects the day of the week to be set Pressing selects the setting number E g Mon Tue Sun and 1 are selected All days can be selected NOTE The simple ON OFF timer setting is available while the weekly timer is on In this case the ON OFF timer has priority over the weekly timer the weekly timer operation will start again after the simple ON OFF timer is complete When the weekl...

Страница 18: ...e blinks 2 Press or buttons to view the setting of the particular day or number 3 Press button to exit the weekly timer setting 4 Press button to complete and transmit the weekly timer setting which was blink ing goes out and the current time will be displayed 8 10 SMART SET OPERATION 1 How to set SMART SET operation 1 Press STOP OPERATE OFF ON button 2 Select COOL or HEAT mode 3 Press SMART SET b...

Страница 19: ...he operation running when SLEEP button is pressed It will change to the set temperature for SLEEP operation in about 30 minutes Pressing SLEEP button again returns the operation to the previous settings is pressed is pressed For about 30 minutes Set temperature for the operation before SLEEP operation Set temperature for SLEEP operation Set temperature for the operation before SLEEP operation NOTE...

Страница 20: ... AUTO mode Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any signal from the remote controller In the latter case normal operation will start NOTE Do not press EMERGENCY OPERATION switch during normal operation 8 13 3 MINUTE TIME DELAY OPERATION When the system turns OFF compressor will not restart for 3 minutes as 3 minute time delay ...

Страница 21: ...er supply before removing the front panel the cabinet the top panel and the electronic control P C board 3 When removing the electronic control P C board hold the edge of the board with care NOT to apply stress on the components 4 When connecting or disconnecting the connectors hold the connector housing DO NOT pull the lead wires MLZ KP09NA MLZ KP12NA MLZ KP18NA 3 Troubleshooting procedure 1 Chec...

Страница 22: ...emperature is displayed with the remote controller headed towards the indoor unit Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted 4 Release the failure mode recall function according to Releasing the failure mode recall function men tioned above Yes Blinks No OFF NOTE 1 Make sure to release the failure mode recall function after it is set up otherwise the unit ...

Страница 23: ...ss of normal or abnormal 2 short beeps are emitted as the signal is received Does OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0 5 seconds Blinks The outdoor unit is abnormal Beeps are emitted at the same timing as the blinking of OPERATION INDICATOR lamp 2 Deleting the memorized abnormal condition Repair the failure parts With the remote controller headed towards the indoo...

Страница 24: ...he serial signal from the out door unit is not received for a maxi mum of 6 minutes Refer to 9 6 How to check miswir ing and serial signal error 5 time blink 2 5 second OFF Not lit Drain pump Float sensor Float sensor is open Float sensor detects abnormal water level Check the float sensor and the drain pump Check the connectors of float sensor and the drain pump Refer to 9 6 Check of float sen so...

Страница 25: ...unit Trouble of thermistor in outdoor unit Left lamp 7 time blink Cause Outdoor unit Trouble of outdoor control system Refer to 9 6 How to check miswiring and serial signal error when outdoor unit does not work Check room temperature thermistor and indoor coil thermis tor Refer to 9 7 Test point diagram and voltage Refer to 9 6 Check of indoor fan motor Refer to How to check the inverter compresso...

Страница 26: ... to the characteristics of indoor coil thermistor and the room temperature thermistor on 9 7 Left lamp blinks 3 time blink 2 5 second OFF When the rotational frequency feedback signal is not emitted during the indoor fan operation Refer to 9 6 Check of indoor fan motor Indoor unit and outdoor unit do not operate Indoor unit and outdoor unit do not operate Left lamp blinks 5 time blink 2 5 second O...

Страница 27: ...TERIA OF MAIN PARTS MLZ KP09NA MLZ KP12NA MLZ KP18NA YLW YLW RED YLW YLW ROTOR Part name Figure Check method and criteria Indoor fan motor Measure the resistance with a tester Part temperature 50 F 86 F 10 C 30 C Normal 8 kΩ 20 kΩ Room temperature thermistor RT11 Indoor coil thermistor RT12 RT14 RT15 MAIN RT13 SUB Horizontal vane motor MV1 Measure the resistance between the terminals with a tester...

Страница 28: ...tch is pressed If more than 12 seconds passes by turn OFF the power supply and turn ON it again then measure the voltage 1 Measure the voltage between CN211 and 2 Measure the voltage between CN211 and The indoor fan motor error has occurred and the indoor fan repeats 12 second ON and 30 second OFF 3 times and then stops Measure the voltage between CN211 and while the fan motor is rotating Is 0 V D...

Страница 29: ...r on receiving part Replace the receiver P C board Assign a number of remote controller Refer to 7 2 Check if the unit operates with the remote controller Does the unit operate with the remote controller Yes No OK Measure the voltage between receiver P C board connector CN301 and when the remote controller button is pressed Is the voltage approximately 4 V DC 5 V DC No Yes Replace the indoor elect...

Страница 30: ...ce between CN211 and of the indoor fan motor connector Short open circuit Replace the indoor fan motor Short open circuit Replace the horizontal vane motor the vertical vane motor coil and the indoor electronic control P C board Turn OFF the power supply Check both parts side and pattern side of the indoor electronic control P C board visually Replace the varistor NR11 and fuse F11 Are the varisto...

Страница 31: ...the operation starts No Yes No Yes Yes No No Yes No Yes As for outdoor unit refer to outdoor unit service manual Turn OFF the power supply Turn ON the power supply Is there 208 230 V AC between outdoor terminal block S1 and S2 Does the left lamp of OPERATION INDICATOR lamp light up Confirmation of the power supply to the indoor unit Press EMERGENCY OPERATION switch once Check the power supply Is t...

Страница 32: ...ncy COOL operation Measure the voltage between CN1N1 and Yes Yes No No Is there 208 230 V AC between CN1N1 and Is there large amount of water in drain pan 1 Refer to 9 5 when float sensor can be checked Yes Replace the indoor electronic control P C board Replace the indoor electronic control P C board Replace the indoor electronic control P C board Check power supply voltage No Replace the float s...

Страница 33: ...gth or the installation condition combination of specific conditions such as antennas or wiring Check the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of ind...

Страница 34: ...gh voltage DC 0 or 15 V DC 5 V DC GND Timer short mode point 2 points Refer to 8 1 SWV1 Changing air flow direction Refer to 8 5 CN151 Vane motor connector Receiver P C board Factory setting Do not change the setting ON OFF 1 2 3 4 5 6 SW101 CN105 Connector to optional interface Modifica tion point for individual operation Refer to 8 2 Indoor coil ther mistor RT13 SUB CN113 Indoor coil ther mistor...

Страница 35: ...e locking mechanism can be detached as shown below There are following 2 types of the terminal with locking mechanism The terminal without locking mechanism can be detached by pulling it out Check the shape of the terminal before detaching Detaching method of the terminal with locking mechanism Connector Sleeve Locking lever MLZ KP09NA MLZ KP12NA MLZ KP18NA NOTE Turn OFF the power supply before di...

Страница 36: ... closely with the ceiling surface Loosely fasten with the provided fixing screws at 4 places on the left and right side Figure 6 5 Tighten the fixing screws at 2 places in the middle and the fixing screw in the center Figure 6 6 Tighten the fixing screws at 4 places on the left and right sides NOTE Make sure there are no gaps between the indoor unit and the grille or between the grille and the cei...

Страница 37: ...t sides Check after installing 1 Check that there are no gaps between the indoor unit and the grille or between the grille and the ceiling surface NOTE If there are any gaps the wind may come in and it may cause water to drip 2 Check that the screw cap is installed 3 Check that the left and right side panels are installed securely 4 Check that the emergency operation switch is installed securely 5...

Страница 38: ...isconnect the connectors of the horizontal and vertical vane motors 6 Remove the indoor coil thermistors main and sub 7 Remove the drain cover 3 fixing screws 8 Remove the pipe band 9 Remove the heat exchanger 6 fixing screws 10 Remove the stabilizer 2 fixing screws 5 Removing the horizontal and vertical vane motors 1 Remove the grille 2 Remove the drain pan 3 Remove the horizontal vane 4 Remove t...

Страница 39: ... to the tabs on the side plate of indoor heat exchanger 9 Remove the indoor heat exchanger 6 fixing screws and slide it downward 10 Remove the stabilizer 2 fixing screws 11 Partially slide the indoor electric control P C board out 12 Disconnect the connector CN211 of indoor fan motor 13 Remove the motor band 2 fixing screws Figure 6 14 Remove the indoor fan motor and line flow fan No need to remov...

Страница 40: ...UNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Issued Mar 2019 No OBH802 REVISED EDITION A Published Mar 2018 No OBH802 Made in Japan Specifications are subject to change without notice sandium com ...

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