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Mitsubishi Mr.SLIM MFZ-KA09NA Service Manual

Indoor unit split-type ac
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See also: Installation Manual
INDOOR UNIT
INDOOR UNIT

SERVICE MANUAL

Models
MFZ-KA09NA
MFZ-KA12NA
MFZ-KA18NA
MFZ-KA09NA
MFZ-KA12NA
MFZ-KA18NA
NOTE:
RoHS compliant products have <G> mark on
the spec name plate.
Revision A:
• OUTLINES AND DIMENSIONS has
been corrected.
• Some descriptions have been modified.
Please void OBH568.
Outdoor unit service manual
MXZ-B NA Series (OBH560)
CONTENTS
2. PART NAMES AND FUNCTIONS ····················· 2
3. SPECIFICATION ················································ 4
4. OUTLINES AND DIMENSIONS ························ 5
5. WIRING DIAGRAM ············································ 6
6. REFRIGERANT SYSTEM DIAGRAM ··············· 7
7. SERVICE FUNCTIONS ····································· 8
8. MICROPROCESSOR CONTROL ··················· 10
9. TROUBLESHOOTING ····································· 16
10. DISASSEMBLY INSTRUCTIONS ···················· 30
PARTS CATALOG (OBB568)
No. OBH568
REVISED EDITION-A
2
·······································
TM

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Summary of Contents for Mitsubishi Mr.SLIM MFZ-KA09NA

  • Page 1: Table Of Contents

    Revision A: • OUTLINES AND DIMENSIONS has been corrected. • Some descriptions have been modified. Please void OBH568. INDOOR UNIT INDOOR UNIT No. OBH568 REVISED EDITION-A SERVICE MANUAL Models MFZ-KA09NA MFZ-KA12NA MFZ-KA18NA Outdoor unit service manual MXZ-B NA Series (OBH560) CONTENTS 1.

  • Page 2: Technical Changes

    Revision A: • OUTLINES AND DIMENSIONS has been corrected. • Some descriptions have been modified. TECHNICAL CHANGES MFZ-KA09NA MFZ-KA12NA MFZ-KA18NA 1. New model PART NAMES AND FUNCTIONS MFZ-KA09NA MFZ-KA12NA MFZ-KA18NA Front grille Vertical vane Fan guard Air outlet Horizontal vane Panel Catechin air filter Air cleaning filter...

  • Page 3: Remote Controller

    ACCESSORIES MFZ-KA09NA MFZ-KA12NA MFZ-KA18NA Drain hose Remote controller holder Fixing screw for 3.5 x 1.6 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...

  • Page 4: Specification

    SPECIFICATION Indoor model MFZ-KA09NA MFZ-KA12NA MFZ-KA18NA Power supply V, phase, Hz 208/230, 1, 60 Max. fuse size (time delay)/ Disconnect switch A COOL Dry 314-251-205-169 321-261-215-177 394-325-279-251 Airfl ow (Wet) CFM (303-241-197-163) (309-252-207-170) (379-313-269-241) Super High - High - Med. - Low - Quiet HEAT Dry CFM 332-219-198-177...

  • Page 5: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MFZ-KA09NA MFZ-KA12NA MFZ-KA18NA Unit: inch 5-5/32 5-5/32 4- 1/4 Hole Installation plate Indoor unit 27-9/16 1-27/32 23-29/32 1-27/32 13-9/32 13-9/32 15/32 7-7/8 Air out More than More than Air in 4-5/8 3-7/8 3-7/8 Gas pipe 09, 12: 3/8(flared) 3-3/4 18: 1/2(flared) Liquid pipe...

  • Page 6: Wiring Diagram

    WIRING DIAGRAM MFZ-KA09NA MFZ-KA12NA MFZ-KA18NA OBH568A...

  • Page 7: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MFZ-KA09NA MFZ-KA12NA MFZ-KA18NA Unit: inch Refrigerant pipe 3/8 (MFZ-KA09/12NA) Refrigerant pipe 1/2 (MFZ-KA18NA) (with heat insulator) Indoor coil Indoor thermistor heat RT12 (main) exchanger Flared connection Distributor Indoor coil thermistor RT12, RT14, RT15 (main) RT13 (sub) Room temperature thermistor RT11 Flared connection...

  • Page 8: Service Functions

    SERVICE FUNCTIONS MFZ-KA09NA MFZ-KA12NA MFZ-KA18NA 7-1. TIMER SHORT MODE For service, the following set time can be shortened by bridging of JPG and JPS on the electronic control P.C. board. (Refer to 9-7.) Set time: 3-minutes 3-seconds (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by bridging of JPG and JPS.) 7-2.
  • Page 9 7-3. 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. The “AUTO RESTART FUNCTION” sets to work the moment power is restored after power failure.

  • Page 10: Microprocessor Control

    MICROPROCESSOR CONTROL MFZ-KA09NA MFZ-KA12NA MFZ-KA18NA WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE/STOP (ON/OFF) button Temperature buttons Indication of remote controller model is on back .) .) SMART SET button FAN SPEED CONTROL button OFF-TIMER button OPERATION SELECT button ECONO COOL button ON-TIMER button TIME SET buttons...
  • Page 11 1. Coil frost prevention The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil from frosting. When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works. The indoor fan operates at the set speed and the compressor stops.
  • Page 12 8-5. AUTO VANE OPERATION Horizontal vane (1) Vane motor drive These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approximately 12 V) transmitted from indoor microprocessor. (2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.
  • Page 13 1.How to set to blow out air from the upper 2.How to set to blow out air from the upper and lower air outlets: air outlet only: Set the air outlet selection switch to Set the air outlet selection switch to Air blows out automatically from the upper and lower air outlets as shown in the table below.
  • Page 14 (11) ECONO COOL ( ) operation (ECONOmical operation) When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 4°F (2°C) higher. Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger (indoor coil ther- mistor).
  • Page 15 8-7. SMART SET ( ) OPERATION 1. How to SET SMART SET operation (1) Press OPERATE/STOP (ON/OFF) button. (2) Select COOL, HEAT or ECONO COOL mode. (3) Press SMART SET button. (4) Set the temperature, fan speed, and airfl ow direction for SMART SET operation. NOTE: •...

  • Page 16: Troubleshooting

    TROUBLESHOOTING MFZ-KA09NA MFZ-KA12NA MFZ-KA18NA 9-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2. Take care of the following during servicing 1) Before servicing the air conditioner, be sure to turn OFF the unit first with the remote controller, and then after confirm- ing the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.

  • Page 17: Failure Mode Recall Function

    9-2. FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though OPERATION INDICATOR lamp indication listed on the troubleshooting check table (9-4.) disappears, the memo- rized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which does not recur.
  • Page 18 2. Indoor unit failure mode table NOTE: Blinking patterns of this mode differs from the ones of Troubleshooting check table (9-4.). Left lamp of Right lamp of Abnormal point Check point Countermeasure OPERATION OPERATION (Failure mode) INDICATOR lamp INDICATOR lamp Not lighted Not lighted Normal...
  • Page 19 9-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit Indoor unit does Indoor unit operates. OPERATION INDICATOR operates. not receive Outdoor unit does lamp on the indoor unit is Outdoor unit the signal from not operate normally. flashing ON and OFF. does not remote controller.
  • Page 20 9-4. TROUBLESHOOTING CHECK TABLE OPERATION INDICATOR · Flashing of OPERATION INDICATOR lamp (left-hand side lamp) Lighted indicates abnormalities. Blinking Not lighted NOTE: Before taking measures, make sure that the symptom reappears for accurate troubleshooting. Self check table Abnormal Operation indicator lamp Symptom Check point Countermeasure...
  • Page 21 OPERATION INDICATOR Lighted · Flashing of OPERATION INDICATOR lamp (right-hand side lamp) indicates abnormality. Blinking · OPERATION INDICATOR lamp (left-hand side lamp) is lighted. Not lighted Abnormal Operation indicator lamp Symptom Check point Countermeasure point Right lamp flash When the operation mode of the each indoor Outdoor unit MXZ type •...

  • Page 22: Troubleshooting Flow

    9-6. TROUBLESHOOTING FLOW When the left lamp of OPERATION INDICATOR lamp flashes 3 times and the right lamp of OPERATION INDICATOR lamp is not lighted. Indoor fan does not operate. -1. Check of indoor fan motor (upper) The indoor fan motor error has occurred, and the indoor fan doesn't operate. Pay careful attention to the high voltage on Turn OFF the power supply.
  • Page 23 When the left lamp of OPERATION INDICATOR lamp flashes 3 times and the right lamp of OPERATION INDICATOR lamp flashes ON and OFF every 0.5-second. Indoor fan does not operate. -2. Check of indoor fan motor (lower) The indoor fan motor error has occurred, and the indoor fan does not operate. Pay careful attention to the high voltage on Turn OFF the power supply.
  • Page 24 B Check of remote controller and indoor electronic control P.C. board Check if the remote controller is exclusive for this air conditioner. Switch on the remote controller. Is the LCD display on the remote Replace the batteries. (Refer to 9-1.4.) controller visible? (not clear) 1 Look at the image of the signal transmitting section of...
  • Page 25 The unit cannot be operated with the remote controller. Also, OPERATION INDICATOR lamp does not light up by pressing EMERGENCY OPERATION switch. C Check of indoor P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211/ CN212 and Turn OFF the power supply.
  • Page 26 When the left lamp of OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit does not operate. D How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage of Check the power 230 VAC in the power supply.
  • Page 27 When the left lamp of OPERATION INDICATOR lamp flashes 15-time. Indoor unit and outdoor unit do not operate. Check of damper After performing the check, make sure to release the failure mode recall function. Turn OFF the power supply. Is there anything that interferes the opening Remove the object.

  • Page 28: Electromagnetic Noise Enters Into Tv Sets Or Radios

    Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the Extend the distance between antennas and the indoor the antennas and the indoor unit within 3 m, or is the unit, or the antennas distance between the and the outdoor unit.
  • Page 29 9-7. TEST POINT DIAGRAM AND VOLTAGE MFZ-KA09NA MFZ-KA12NA MFZ-KA18NA Indoor electronic control P.C. board Room temperature thermistor RT11 FUSE (F11) Indoor coil thermistor RT14 (MAIN 2) T3.15AL250V Power supply Indoor coil thermistor RT13 (SUB) input 208/230 VAC Indoor coil thermistor RT12 (MAIN 1) 5 VDC Indoor coil thermistor RT15 (MAIN 3) Release of Auto restart function...

  • Page 30: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types (refer to (1) and (2)) 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.
  • Page 31 OPERATING PROCEDURE PHOTOS 2. Removing the electronic control P.C. board and the Photo 3 display receiver P.C. board (1) Remove the panel. (Refer to 1.) (2) Remove the screw of the electrical cover, and then the electrical cover. (See Photo 3.) (3) Remove the screw of the indoor/outdoor connecting wire, and then the indoor/outdoor connecting wire.
  • Page 32 OPERATING PROCEDURE PHOTOS Photo 6 4. Removing the horizontal vane motor unit (1) Remove the panel. (Refer to 1.) (2) Remove the screws of the horizontal vane motor unit and pull out the horizontal vane motor unit. (See Photo 6.) (3) Disconnect the connector from the horizontal vane motor unit.
  • Page 33 OPERATING PROCEDURE PHOTOS Photo 9 6. Removing the damper lock motor, the damper motor and the damper limit switch (1) Remove the panel. (Refer to 1.) (2) Remove the screws of the nozzle assembly (lower). (See Photo 9.) (3) Remove the drain hose from the nozzle assembly (lower) and pull out the nozzle assembly (lower) toward you.
  • Page 34 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2010 MITSUBISHI ELECTRIC CO.,LTD Distributed in Dec. 2014. No. OBH568 REVISED EDITION-A New publication, effective Dec. 2014 Distributed in Jan. 2010. No. OBH568 7 Specifications are subject to change without notice.

This manual is also suitable for:

Mr.slim mfz-ka18naMr.slim mfz-ka12na

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