Mitsubishi Electric MSZ-FH09NA Service Manualce Manual
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Mitsubishi Electric MSZ-FH09NA Service Manualce Manual

Indoor unit
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SPLIT-TYPE AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL

Models
MSZ-FH09NA
MSZ-FH12NA
MSZ-FH15NA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
• 4. OUTLINE AND DIMENSIONS has been modified.
• Some descriptions have been modified.
Please void OBH683 REVISED EDITION-A.
Outdoor unit service manual
MUZ-FH·NA(H) Series (OBH684)
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 5
4. OUTLINES AND DIMENSIONS ························ 6
5. WIRING DIAGRAM ············································ 7
6. REFRIGERANT SYSTEM DIAGRAM ··············· 8
7. SERVICE FUNCTIONS ····································· 9
8. MICROPROCESSOR CONTROL ····················11
9. TROUBLESHOOTING ····································· 20
10. DISASSEMBLY INSTRUCTIONS ···················· 32
PARTS CATALOG (OBB683)
No. OBH683
REVISED EDITION-B

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Summary of Contents for Mitsubishi Electric MSZ-FH09NA

  • Page 1: Table Of Contents

    Please void OBH683 REVISED EDITION-A. SPLIT-TYPE AIR CONDITIONERS INDOOR UNIT No. OBH683 SERVICE MANUAL REVISED EDITION-B Models MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA Outdoor unit service manual MUZ-FH·NA(H) Series (OBH684) CONTENTS 1. TECHNICAL CHANGES ··································· 3 2. PART NAMES AND FUNCTIONS ····················· 4 3.

  • Page 2: Revision B

    Use the specifi ed 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.

  • Page 3: Technical Changes

    TECHNICAL CHANGES MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA 1. New model OBH683B...

  • Page 4: Part Names And Functions

    PART NAMES AND FUNCTIONS MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA Front panel Air inlet Emergency operation switch Air filter (Nano platinum filter) Air cleaning filter (Electrostatic anti-allergy enzyme filter and deodorizing fiter) Horizontal i-see SENSOR vane Air outlet Remote controller Remote control receiving...

  • Page 5: Specification

    SPECIFICATION Indoor model MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA Power supply V, phase, Hz 208/230 , 1 , 60 Disconnect switch Min. circuit ampacity Fan motor F.L.A 0.67 COOL Dry 381- 304 - 221 - 167 - 137 398 - 304 - 221 - 167 - 137 411 - 355 - 304 - 262 - 225 Airfl...

  • Page 6: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA Unit: inch OBH683B...

  • Page 7: Wiring Diagram

    WIRING DIAGRAM MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA OBH683B...

  • Page 8: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MSZ-FH09NA MSZ-FH12NA Unit: inch Refrigerant pipe ø3/8 (with heat insulator) Indoor coil Indoor thermistor heat RT12 (main) exchanger Flared connection Indoor coil thermistor RT13 (sub) Room temperature thermistor RT11 Flared connection Refrigerant pipe ø1/4 (with heat insulator)

  • Page 9: Service Functions

    SERVICE FUNCTIONS MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA 7-1. TIMER SHORT MODE For service, the following set time can be shortened by bridging 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 JPG and JPS.)
  • Page 10 7-4. 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.

  • Page 11: Microprocessor Control

    MICROPROCESSOR CONTROL MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA WIRELESS REMOTE CONTROLLER Signal transmitting section Distance of signal : About 20 ft. (6 m) Beep(s) is (are) heard from the indoor unit when the signal is received. FAN SPEED CONTROL button OPERATION SELECT button...
  • Page 12 8-1. COOL ( ) OPERATION (1) Press OPERATE/STOP (ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons TEMP button to select the desired temperature. The setting range is 61 - 88°F (16 - 31°C).
  • Page 13 8-5. AUTO CHANGE OVER ··· AUTO MODE OPERATION Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation. Mode selection (1) Initial mode When unit starts the operation with AUTO operation from OFF: • If the room temperature is higher than the set temperature, operation starts in COOL mode. •...
  • Page 14 (3) Positioning To confirm the standard position, the vane move until it touches the vane stopper. Then the vane is set to the select- ed angle. Confirming of standard position is performed in the following cases: (a) When the operation starts or finishes (including timer operation). (b) When the test run starts.
  • Page 15 2. Vertical vane (1) Vane motor drive These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approximately 12 V) transmitted from microprocessor. (2) The vertical vane angle and mode change as follows by pressing WIDE VANE CONTROL button. (3) Positioning (SWING) To confirm the standard position, the vane moves until it touches the vane stopper.
  • Page 16 PROGRAM TIMER • OFF timer and ON timer can be used in combination. The set time that is reached first will operate first. • “ ” and “ ” display shows the order of OFF timer and ON timer operation. (Example 1) The current time is 8:00 PM.
  • Page 17 1. How to set the weekly timer * Make sure that the current time and day are set correctly. (1) Press button to enter the weekly timer setting mode. blinks. (2) Press buttons to select setting day and number E.g. : [Mon Tue ... Sun] and [1] are selected.
  • Page 18 (5) Press button to turn the weekly timer ON. ( lights.) •When the weekly timer is ON, the day of the week whose timer setting is complete, will light. Press button again to turn the weekly timer OFF. ( goes out.) NOTE: The saved settings will not be cleared when the weekly timer is turned OFF.
  • Page 19 8-11. NATURAL FLOW ( ) OPERATION In NATURAL FLOW operation, air fl ow will become more like natural wind. An occupant will not be directly exposed to the air fl ow and feel more comfortable. (1) Press NATURAL FLOW button during COOL or FAN mode to start NATURAL FLOW operation. (2) Press NATURAL FLOW button again to cancel NATURAL FLOW operation.

  • Page 20: Troubleshooting

    TROUBLESHOOTING MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA 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 main unit first with the remote controller, and then after confirming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.

  • Page 21: 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 LED indication listed on the troubleshooting check table (9-4.) disappears, the memorized failure details can be recalled. 1.
  • Page 22 2. Indoor unit failure mode table The left lamp of Abnormal point the OPERATION Condition Remedy (Failure mode) INDICATOR lamp Not lighted Normal — — The room temperature thermistor short or 1-time fl ash every Room temperature Refer to the characteristics of the room temperature open circuit is detected every 8 seconds dur- 0.5-second thermistor...
  • Page 23 9-3. INSTRUCTION OF TROUBLESHOOTING "Test Run operation" means the If blinking of OPERATION INDI- operation within 30 minutes af- CATOR lamp cannot be checked, Start ter EMERGENCY OPERATION it can be checked with failure switch is pressed. mode recall function. Indoor unit operates.
  • Page 24 9-4. TROUBLESHOOTING CHECK TABLE Before taking measures, make sure that the symptom reappears for accurate troubleshooting. When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp flashes. •...
  • Page 25 9-5. TROUBLE CRITERION OF MAIN PARTS MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA Part name Check method and criterion Figure Measure the resistance with a tester. Room temperature thermistor (RT11) Refer to 9-7. "Test point diagram and voltage", "Indoor electronic control P.C. Indoor coil thermistor board", for the chart of thermistor.

  • Page 26: Troubleshooting Flow

    9-6. TROUBLESHOOTING FLOW A Check of indoor fan motor The indoor fan motor error has occurred, and the indoor fan does not operate. Turn OFF the power supply. Pay enough attention to the high voltage on the fan motor connector CN211. Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch.
  • Page 27 B Check of remote controller and indoor electronic control P.C. board Check if the remote controller is exclusive for this air conditioner. Press OPERATE/STOP (ON/OFF) button on the remote controller. 1 Look at the image of the signal transmitting section of the remote controller through the monitor of a digital camera or a camera phone.
  • Page 28 C Check of indoor P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211 from indoor power P.C. board and vane Measure the resistance of indoor fan Short circuit: motor connector CN151 from the indoor motor.
  • Page 29 D How to check miswiring and serial signal error NOTE: Refer to the outdoor unit service manual. Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Is there rated voltage between the outdoor terminal block S1 and S2? Check the wiring.
  • Page 30 E Electromagnetic noise enters into TV sets or radios Is the unit grounded? Ground the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 9.91 ft. (3m), the indoor unit, and/or the antennas and the or is the distance between the antennas outdoor unit.
  • Page 31 9-7. TEST POINT DIAGRAM AND VOLTAGE Indoor power P.C. board, Indoor electronic control P.C. board, Receiver board, Display board, Switch board MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA Fuse (F11) Varistor (NR11) Indoor power P.C. board Connector Indoor fan motor Terminal Block (CN211) (CN201)

  • Page 32: Disassembly Instructions

    Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 10-1. MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA NOTE: Turn OFF power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the panel Photo 1 Front panel (1) Remove the horizontal vanes.
  • Page 33 OPERATING PROCEDURE PHOTOS 2. Removing the indoor electrical box Photo 3 Ground wire Electrical box (1) Remove the panels (Refer to 1.) and the right corner box. (2) Remove the screw of the V.A. clamp and V.A. clamp. (3) Remove the screw of the electrical cover and the electrical cover.
  • Page 34 OPERATING PROCEDURE PHOTOS 3. Removing the indoor power P.C. board, the Photo 6 switch board, the display board, the receiver Catch of the DISPLAY AND board and the indoor electronic control P.C. i-see SENSOR ASSEMBLY board (1) Remove the panels (Refer to 1.) and the right corner box.
  • Page 35 OPERATING PROCEDURE PHOTOS 4. Removing the nozzle assembly Photo 8 (1) Remove the panels (Refer to 1.) and the right corner Screw of the vertical box. vane motor unit (2) Remove the indoor/outdoor connecting wire (Refer to 2.). (3) Remove the electrical cover (Refer to 2.). (4) Disconnect the following connector: <Indoor electronic control P.C.
  • Page 36 OPERATING PROCEDURE PHOTOS 7. Removing the indoor fan motor, the indoor coil Photo 10 Lead wire of the indoor thermistor and the line flow fan coil thermistor (1) Remove the panels (Refer to 1.) and the right corner Water cut box.
  • Page 37 Fixing the indoor coil thermistor There are 2 forms of parts for fixing the indoor coil thermistor. When fixing the indoor coil thermistor to the clip-shape/holder-shape part, the Clip shape Holder shape lead wire should point down. About the same length Position and procedure for mounting the clip-shape part 1.
  • Page 38 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Distributed in Jul. 2014. No. OBH683 REVISED EDITION-B Distributed in Apr. 2014. No. OBH683 REVISED EDITION-A New publication, effective Jul. 2014 Distributed in Feb. 2014. No. OBH683 Specifications are subject to change without notice.

This manual is also suitable for:

Msz-fh15naMsz-fh12naMsz-fh18na

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