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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-EF09NAW -
MSZ-EF15NAW -
MSZ-EF09NAB -
MSZ-EF15NAB -
MSZ-EF09NAS -
MSZ-EF15NAS -
MSZ-EF12NAW -
U1
MSZ-EF18NAW -
U1
MSZ-EF12NAB -
U1
MSZ-EF18NAB -
U1
MSZ-EF12NAS -
U1
MSZ-EF18NAS -
U1
Outdoor unit service manual
MXZ- ∙C∙NA(HZ) Series (OCH573)
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 ················ 11
9. TROUBLESHOOTING ······························· 19
10. DISASSEMBLY INSTRUCTIONS ················· 31
PARTS CATALOG (OBB736)
Revision A:
• 4. OUTLINES AND DIMENTIONS has been
modified.
• Some descriptions have been modified.
OBH736 is void.
No. OBH736
REVISED EDITION-A
U1
U1
U1
U1
U1
U1
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Table of Contents
Related Manuals for Mitsubishi MXZ-*C*NA Series
Summary of Contents for Mitsubishi MXZ-*C*NA Series
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Page 1: Table Of Contents
Revision A: • 4. OUTLINES AND DIMENTIONS has been modified. • Some descriptions have been modified. OBH736 is void. INDOOR UNIT No. OBH736 SERVICE MANUAL REVISED EDITION-A Models MSZ-EF09NAW - MSZ-EF12NAW - MSZ-EF15NAW - MSZ-EF18NAW - MSZ-EF09NAB - MSZ-EF12NAB - MSZ-EF15NAB - MSZ-EF18NAB - MSZ-EF09NAS -... -
Page 2: Technical Changes
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: Part Names And Functions
PART NAMES AND FUNCTIONS MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS Front panel Air lter (Nano platinum lter) Air cleaning lter (Electrostatic anti-allergy enzyme lter) Air inlet Horizontal vane Emergency Air outlet operation switch Heat exchanger Operation Remote control indicator lamp... -
Page 4: Specification
SPECIFICATION Indoor unit model MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS Power supply V, phase, Hz 208/230 , 1 , 60 Disconnect switch Min. circuit ampacity Fan motor F.L.A 0.67 COOL Dry 371 - 293 - 222 - 162 - 141 371 - 293 - 222 - 162 - 141 364 - 314 - 272 - 233 - 205 388 - 328 - 279 - 240 - 205... - Page 5 3-2. OUTLET AIR SPEED AND COVERAGE Airfl ow Air speed Model Mode Function Coverage (ft.) (CFM) (ft./s) ● The air coverage is the figure up to the HEAT 19.5 29.2 MSZ-EF09NAW position where the air speed is 1 ft./s, MSZ-EF09NAB 17.2 25.8 when air is blown out horizontally from...
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Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS Unit: inch 7/16 × 1 Oblong hole 7/16 × 13/16 Oblong hole Installation plate 8-7/8 8-7/8 3-1/4 3-1/4 34-13/16 34-7/16 3/16 Indoor unit 7-1/16 7-1/16 2-7/16 14-15/16 14-1/2... -
Page 7: Wiring Diagram
WIRING DIAGRAM MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS OBH736A... -
Page 8: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS Unit: inch (mm) Refrigerant pipe ø3/8 (ø9.52) (MSZ-EF09/12) ø1/2 (ø12.7) (MSZ-EF15/18) (with heat insulator) Indoor coil Indoor thermistor heat RT12 (main) exchanger Flared connection Indoor coil thermistor RT13 (sub) Room temperature... -
Page 9: Service Functions
SERVICE FUNCTIONS MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS 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.) •... - Page 10 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. “AUTO RESTART FUNCTION” automatically starts operation in the same mode just before the shutoff of the main power.
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Page 11: Microprocessor Control
MICROPROCESSOR CONTROL MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS WIRELESS REMOTE CONTROLLER Signal transmitting section FAN SPEED CONTROL button OPERATION SELECT button Operation display section VANE CONTROL button ECONO COOL button TIME, TIMER set buttons FORWARD button BACKWARD button SMART SET button... - Page 12 8-1. COOL ( ) OPERATION (1) Press STOP/OPERATE (OFF/ON) 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 (4) VANE AUTO ( ) mode In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room tem- perature distribution. In COOL and DRY operation In HEAT operation Vane angle is fixed to Horizontal position. Vane angle is fixed to Angle 4.
- Page 15 8-7. TIMER OPERATION 1. How to set the time (1) Check that the current time is set correctly. NOTE: Timer operation will not work without setting the current time. Initially “12:00 AM” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK button. How to set the current time (a) Press the CLOCK button.
- Page 16 8-8. WEEKLY TIMER OPERATION • A maximum of 4 ON or OFF timers can be set for individual days of the week. • A maximum of 28 ON or OFF timers can be set for a week. E.g. : Runs at 75°F (24°C) from waking up to leaving home, and runs at 81°F (27°C) from getting home to going to bed on weekdays.
- Page 17 (4) Press button to complete and transmit the weekly timer setting. which was blink- ing goes out, and the current time will be displayed. NOTE: • Press button to transmit the setting information of weekly timer to the indoor unit. Point the remote controller toward the indoor unit for 3 seconds.
- Page 18 8-9. SMART SET ( ) OPERATION 1. How to set SMART SET operation (1) Press STOP/OPERATE (OFF/ON) 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: •...
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Page 19: Troubleshooting
TROUBLESHOOTING MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS 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 20 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 21 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 blink every Room temperature Refer to the characteristics of the room temperature open circuit is detected every 8 seconds dur- 0.5-second thermistor...
- Page 22 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 23 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 blinks. •...
- Page 24 OPERATION INDICATOR Abnormal Operation indicator lamp Symptom Condition Remedy point Left lamp lights and lower lamp blinks. The operation mode of the each indoor unit MXZ type Outdoor unit is differently set to COOL (includes DRY) and • Unify the operation mode. Operation operates but HEAT at the same time, the operation mode...
- Page 25 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 26 B Check of remote controller and indoor electronic control P.C. board Check if the remote controller is exclusive for this air conditioner. Press STOP/OPERATE (OFF/ON) 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 27 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 28 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. Check the wiring. Is there rated voltage between the outdoor terminal block S1 and S2? Press EMERGENCY OPERATION switch once.
- Page 29 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 30 9-7. TEST POINT DIAGRAM AND VOLTAGE MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS Fuse (F11) Varistor (NR11) Indoor fan motor Indoor power P.C. board (CN211) Connector to terminal 325 V DC block (CN201) (–) GND (high- voltage DC) 15 V DC (+)3-6 V DC...
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Page 31: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <Dataching method of the terminal with locking mechanism> The terminal which has the locking mechanism can be detached as shown below. There are 2 types of terminals with locking mechanisms. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. - Page 32 OPERATING PROCEDURE PHOTOS/FIGURES Ground wire 2. Remove the indoor electrical box Photo 2 Electrical box (1) Remove the panel (Refer to section 1.) and the corner box right. (2) Remove the screw of the V.A. clamp. Remove the V.A. clamp and the indoor/outdoor connecting wire.
- Page 33 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the nozzle assembly Photo 5 (1) Remove the panel (Refer to section 1.) and the corner box right. (2) Remove the indoor/outdoor connecting wire (Refer to 2.). (3) Remove the electrical cover (Refer to section 2.). (4) Disconnect the following connector: <Indoor electronic control P.C.
- Page 34 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the indoor fan motor, the indoor coil Photo 6 Lead wire of thermistor and the line flow fan the indoor coil thermistor (1) Remove the panel (Refer to section 1.) and the corner box right. (2) Remove the indoor electronic control P.C.
- Page 35 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 36 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2015 MITSUBISHI ELECTRIC CORPORATION Issued: Oct. 2018. No. OBH736 REVISED EDITION-A Published: Oct. 2015. No. OBH736 Made in Japan...