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INDOOR UNIT
TECHNICAL &
SERVICE MANUAL
Models
MSZ-EX09NLW
MSZ-EX15NLW
MSZ-EX09NLB
MSZ-EX15NLB
MSZ-EX09NLS
MSZ-EX15NLS
MSZ-EX12NLW
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U1
MSZ-EX18NLW
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U1
MSZ-EX12NLB
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U1
MSZ-EX18NLB
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U1
MSZ-EX12NLS
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U1
MSZ-EX18NLS
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U1
Outdoor unit technical &
service manual
MXZ-D•NL Series (OBD949)
MXZ-D•NLHZ Series (OBD949)
Indoor unit service manual
MSZ-EX•NL Series (TBH238)
Outdoor unit service manual
MXZ-D•NL Series (OBH949)
MXZ-D•NLHZ Series (OBH949)
CONTENTS
1. TECHNICAL CHANGES ······························2
USING REFRIGERANT R454B ·····················3
3. PART NAMES AND FUNCTIONS ··················5
4. SPECIFICATION ········································6
5. OUTLINES AND DIMENSIONS ·····················8
6. WIRING DIAGRAM ·····································9
7. REFRIGERANT SYSTEM DIAGRAM ··········· 10
8. SERVICE FUNCTIONS ······························ 11
9. MICROPROCESSOR CONTROL ················· 13
10. TROUBLESHOOTING ······························· 21
11. DISASSEMBLY INSTRUCTIONS ················· 33
13. NOISE CRITERION CURVES ······················ 39
DISTRIBUTIONS ······································ 41
No. OBD956
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U1
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U1
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U1
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U1
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U1
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U1
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MSZ-EX09NLW-U1
Summary of Contents for Mitsubishi Electric MSZ-EX09NLW-U1
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Page 1: Table Of Contents
INDOOR UNIT No. OBD956 TECHNICAL & SERVICE MANUAL Models MSZ-EX09NLW MSZ-EX12NLW MSZ-EX15NLW MSZ-EX18NLW MSZ-EX09NLB MSZ-EX12NLB MSZ-EX15NLB MSZ-EX18NLB MSZ-EX09NLS MSZ-EX12NLS MSZ-EX15NLS MSZ-EX18NLS Outdoor unit technical & Indoor unit service manual service manual MSZ-EX•NL Series (TBH238) MXZ-D•NL Series (OBD949) Outdoor unit service manual MXZ-D•NLHZ Series (OBD949) MXZ-D•NL Series (OBH949) MXZ-D•NLHZ Series (OBH949) -
Page 2: Technical Changes
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. -
Page 3: Servicing Precautions For Units Using Refrigerant R454B
SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R454B Servicing precautions for units using refrigerant R454B WARNING This unit uses a flammable refrigerant. If refrigerant leaks and comes in contact with fire or heating part, it will create harmful gas and there is risk of fire. Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer. - Page 4 4. Detection of Flammable Refrigerants Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used. 5. Leak Detection Methods Electronic leak detectors may be used to detect refrigerant leaks but, in the case of flammable refrigerants, the sensitivity may not be adequate, or may need re-calibration.
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Page 5: Part Names And Functions
PART NAMES AND FUNCTIONS MSZ-EX09NLW MSZ-EX12NLW MSZ-EX15NLW MSZ-EX18NLW MSZ-EX09NLB MSZ-EX12NLB MSZ-EX15NLB MSZ-EX18NLB MSZ-EX09NLS MSZ-EX12NLS MSZ-EX15NLS MSZ-EX18NLS Front panel Air fi lter (V air fi lter) Air cleaning fi lter (Electrostatic anti-allergy enzyme fi lter) Air inlet Horizontal vane Emergency Air outlet operation switch Heat exchanger Operation... -
Page 6: Specification
SPECIFICATION MSZ-EX09NLW MSZ-EX12NLW MSZ-EX15NLW MSZ-EX18NLW Indoor unit model MSZ-EX09NLB MSZ-EX12NLB MSZ-EX15NLB MSZ-EX18NLB MSZ-EX09NLS MSZ-EX12NLS MSZ-EX15NLS MSZ-EX18NLS Power supply V, phase, Hz 208/230 , 1 , 60 Disconnect switch Min. circuit ampacity Fan motor output 0.04 COOL Dry 391 - 305 - 228 - 164 - 143 391 - 305 - 228 - 164 - 143 382 - 330 - 280 - 240 - 208 408 - 343 - 288 - 248 - 208... -
Page 7: Outlet Air Speed And Coverage
4-2. OUTLET AIR SPEED AND COVERAGE Airflow Air speed Coverage Model Mode Function (CFM) (ft./s) (ft.) ● The air coverage is the figure up to the HEAT 20.7 31.0 MSZ-EX09NLW position where the air speed is 1 ft./s, MSZ-EX09NLB 18.1 27.2 when air is blown out horizontally from COOL... -
Page 8: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSZ-EX09NLW MSZ-EX12NLW MSZ-EX15NLW MSZ-EX18NLW MSZ-EX09NLB MSZ-EX12NLB MSZ-EX15NLB MSZ-EX18NLB MSZ-EX09NLS MSZ-EX12NLS MSZ-EX15NLS MSZ-EX18NLS Unit: inch 7/16 × 1 Oblong hole 7/16 × 13/16 Oblong hole Installation plate 3-1/4 3-1/4 8-7/8 8-7/8 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 9: Wiring Diagram
WIRING DIAGRAM MSZ-EX09NLW MSZ-EX12NLW MSZ-EX15NLW MSZ-EX18NLW MSZ-EX09NLB MSZ-EX12NLB MSZ-EX15NLB MSZ-EX18NLB MSZ-EX09NLS MSZ-EX12NLS MSZ-EX15NLS MSZ-EX18NLS OBD956... -
Page 10: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MSZ-EX09NLW MSZ-EX12NLW MSZ-EX15NLW MSZ-EX18NLW MSZ-EX09NLB MSZ-EX12NLB MSZ-EX15NLB MSZ-EX18NLB MSZ-EX09NLS MSZ-EX12NLS MSZ-EX15NLS MSZ-EX18NLS Unit: inch (mm) Refrigerant pipe ø3/8 (ø9.52) (MSZ-EX09/12) ø1/2 (ø12.7) (MSZ-EX15/18) (with heat insulator) Indoor coil Indoor thermistor heat RT12 (main) exchanger Flared connection Indoor coil thermistor RT13 (sub) Room temperature... -
Page 11: Service Functions
SERVICE FUNCTIONS MSZ-EX09NLW MSZ-EX12NLW MSZ-EX15NLW MSZ-EX18NLW MSZ-EX09NLB MSZ-EX12NLB MSZ-EX15NLB MSZ-EX18NLB MSZ-EX09NLS MSZ-EX12NLS MSZ-EX15NLS MSZ-EX18NLS 8-1. 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 10-7.) •... - Page 12 8-3. 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 13: Microprocessor Control
MICROPROCESSOR CONTROL MSZ-EX09NLW MSZ-EX12NLW MSZ-EX15NLW MSZ-EX18NLW MSZ-EX09NLB MSZ-EX12NLB MSZ-EX15NLB MSZ-EX18NLB MSZ-EX09NLS MSZ-EX12NLS MSZ-EX15NLS MSZ-EX18NLS WIRELESS REMOTE CONTROLLER Signal transmitting section Distance of signal : About 20 ft. (6 m) Battery replacement indicator Beep(s) is (are) heard from the indoor unit when the signal is received. - Page 14 9-1. COOL ( ) OPERATION (1) Press OFF/ON (stop/operate) 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).
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Page 15: Auto Vane Operation
9-5. 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 16 (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.
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Page 17: Timer Operation
9-7. 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 18: Weekly Timer Operation
9-8. 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 19 (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 20 9-9. SMART SET ( ) OPERATION 1. How to set SMART SET operation (1) Press OFF/ON (stop/operate) button. (2) Select COOL, HEAT or ECONO COOL mode. (3) Press SMART SET button. (4) Set the temperature, fan speed, and airflow direction for SMART SET operation. NOTE: •...
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Page 21: Troubleshooting
TROUBLESHOOTING MSZ-EX09NLW MSZ-EX12NLW MSZ-EX15NLW MSZ-EX18NLW MSZ-EX09NLB MSZ-EX12NLB MSZ-EX15NLB MSZ-EX18NLB MSZ-EX09NLS MSZ-EX12NLS MSZ-EX15NLS MSZ-EX18NLS 10-1. 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 con- firming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug. - Page 22 10-2. 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 (10-4.) disappears, the memorized failure details can be recalled. 1.
- Page 23 2. Table of indoor unit failure mode recall function The left lamp of Abnormal point the OPERATION Condition Remedy (Failure mode) INDICATOR lamp Not lit 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 0.5-second thermistor...
- Page 24 10-3. INSTRUCTION OF TROUBLESHOOTING *2 There is possibility that diesel explosion may occur due to the air mixed in the refrigerant circuit. First, ensure that there are no leakage points on the valves, flare connections, etc. that allow the air to flow into the refrigerant circuit, or no blockage points (e.g. clogged or closed valves) in the refrigerant circuit that cause an increase in pressure.
- Page 25 10-4. 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 26 OPERATION INDICATOR Abnormal Operation indicator lamp Symptom Condition Remedy point The operation mode of the each indoor unit is Left lamp lights and lower lamp blinks. MXZ type Outdoor unit differently set to COOL (includes DRY) and • Unify the operation mode. Operation operates but HEAT at the same time, the operation mode of...
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Page 27: Troubleshooting Flow
10-6. 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 the emergency operation switch. - Page 28 B Check of remote controller and indoor electronic control P.C. board *Check if the remote controller is exclusive for this air conditioner. Press OFF/ON (stop/operate) 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 29 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 between Short circuit: motor connector CN151 from the indoor CN211 of the indoor fan motor Replace the indoor fan motor.
- Page 30 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 31 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 out- or is the distance between the antennas door unit.
- Page 32 10-7. TEST POINT DIAGRAM AND VOLTAGE MSZ-EX09NLW MSZ-EX12NLW MSZ-EX15NLW MSZ-EX18NLW MSZ-EX09NLB MSZ-EX12NLB MSZ-EX15NLB MSZ-EX18NLB MSZ-EX09NLS MSZ-EX12NLS MSZ-EX15NLS MSZ-EX18NLS Fuse (F11) Indoor fan motor Varistor (NR11) (CN211) Indoor power P.C. board 294/325 V DC Connector to terminal (–) GND (high- block (CN201) voltage DC) 15 V DC (+)3-6 V DC...
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Page 33: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <Detaching 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 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 34: Operating Procedure
OPERATING PROCEDURE PHOTOS/FIGURES 2. Remove the indoor electrical box Photo 2 Ground wire Electrical box (1) Remove the panel (Refer to section 1.) and the cor- ner box right. (2) Remove the screw of the V.A. clamp. Remove the V.A. clamp and the indoor/outdoor connecting wire. - Page 35 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 section 2.). (3) Remove the electrical cover (Refer to section 2.). (4) Disconnect the following connector: <Indoor electronic control P.C.
- Page 36 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 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.
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Page 38: Position Of The Center Of Gravity
POSITION OF THE CENTER OF GRAVITY Wall-mounted type Unit: inch (mm) Model name MSZ-EX09NLW MSZ-EX12NLW MSZ-EX15NLW MSZ-EX18NLW MSZ-EX09NLB MSZ-EX12NLB 14-1/2 3-15/16 5-5/8 34-13/16 7-11/16 11-3/4 MSZ-EX15NLB (369) (100) (143) (885) (195) (299) MSZ-EX18NLB MSZ-EX09NLS MSZ-EX12NLS MSZ-EX15NLS MSZ-EX18NLS OBD956... -
Page 39: Noise Criterion Curves
NOISE CRITERION CURVES MSZ-EX09NLW MSZ-EX12NLW MSZ-EX09NLB MSZ-EX12NLB MSZ-EX09NLS MSZ-EX12NLS FAN SPEED FUNCTION SPL(dB(A)) LINE FAN SPEED FUNCTION SPL(dB(A)) LINE COOLING COOLING Super High Super High HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20 NC-10 NC-10 1000 2000... - Page 40 MSZ-EX15NLW MSZ-EX18NLW MSZ-EX15NLB MSZ-EX18NLB MSZ-EX15NLS MSZ-EX18NLS FAN SPEED FUNCTION SPL(dB(A)) LINE FAN SPEED FUNCTION SPL(dB(A)) LINE COOLING COOLING Super High Super High HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20 NC-10 NC-10 1000 2000 4000 8000 1000...
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Page 41: Temperature And Air Flow Distributions
TEMPERATURE AND AIR FLOW DISTRIBUTIONS MSZ-EX09NLW MSZ-EX09NLB MSZ-EX09NLS Temperature distribution <Cooling mode> Air volume: high Air direction: auto (upward air flow) [°C(F)] [°C(F)] 25(77) 25(77) 21(70) 21(70) 23(73) 23(73) 25(77) 25(77) 27(81) 27(81) 3000 2000 1000 (118.11) (78.74) (39.37) Floor distance [ mm (inch) ] <Heating mode>... - Page 42 MSZ-EX09NLW MSZ-EX09NLB MSZ-EX09NLS Airflow distribution <Cooling mode> Air volume: high Air direction: auto (upward air flow) [m/s(ft/s)] [m/s(ft/s)] 0.3(1.0) 0.3(1.0) 2.1(6.9) 2.1(6.9) 1.5(4.9) 1.5(4.9) 0.9(3.0) 0.9(3.0) 0.3(1.0) 0.3(1.0) 0.3(1.0) 0.3(1.0) 3000 2000 1000 (118.11) (78.74) (39.37) Floor distance [ mm (inch) ] <Heating mode>...
- Page 43 MSZ-EX12NLW MSZ-EX12NLB MSZ-EX12NLS Temperature distribution <Cooling mode> Air volume: high Air direction: auto (upward air flow) [°C(F)] [°C(F)] 27(81) 27(81) 19(66) 19(66) 21(70) 21(70) 23(73) 23(73) 25(77) 25(77) 27(81) 27(81) 25(77) 25(77) 4000 3000 2000 1000 (157.48) (118.11) (78.74) (39.37) Floor distance [ mm (inch) ] <Heating mode>...
- Page 44 MSZ-EX12NLW MSZ-EX12NLB MSZ-EX12NLS Airflow distribution <Cooling mode> Air volume: high Air direction: auto (upward air flow) [m/s(ft/s)] [m/s(ft/s)] 2.1(6.9) 2.1(6.9) 1.5(4.9) 1.5(4.9) 0.9(3.0) 0.9(3.0) 0.3(1.0) 0.3(1.0) 0.3(1.0) 0.3(1.0) 4000 3000 2000 1000 (157.48) (118.11) (78.74) (39.37) Floor distance [ mm (inch) ] <Heating mode>...
- Page 45 MSZ-EX15NLW MSZ-EX15NLB MSZ-EX15NLS Temperature distribution <Cooling mode> Air volume: high Air direction: auto (upward air flow) [°C(F)] [°C(F)] 25(77) 25(77) 21(70) 21(70) 23(73) 23(73) 27(81) 27(81) 25(77) 25(77) 5000 4000 3000 2000 1000 (196.85) (157.48) (118.11) (78.74) (39.37) Floor distance [ mm (inch) ] <Heating mode>...
- Page 46 MSZ-EX15NLW MSZ-EX15NLB MSZ-EX15NLS Airflow distribution <Cooling mode> Air volume: high Air direction: auto (upward air flow) [m/s(ft/s)] [m/s(ft/s)] 2.1(6.9) 2.1(6.9) 1.5(4.9) 1.5(4.9) 0.3(1.0) 0.3(1.0) 0.9(3.0) 0.9(3.0) 0.3(1.0) 0.3(1.0) 5000 4000 3000 2000 1000 (196.85) (157.48) (118.11) (78.74) (39.37) Floor distance [ mm (inch) ] <Heating mode>...
- Page 47 MSZ-EX18NLW MSZ-EX18NLB MSZ-EX18NLS Temperature distribution <Cooling mode> Air volume: high Air direction: auto (upward air flow) [°C(F)] [°C(F)] 19(66) 19(66) 21(70) 21(70) 23(73) 23(73) 27(81) 27(81) 25(77) 25(77) 6000 5000 4000 3000 2000 1000 (236.22) (196.85) (157.48) (118.11) (78.74) (39.37) Floor distance [ mm (inch) ] <Heating mode>...
- Page 48 MSZ-EX18NLW MSZ-EX18NLB MSZ-EX18NLS Airflow distribution <Cooling mode> Air volume: high Air direction: auto (upward air flow) [m/s(ft/s)] [m/s(ft/s)] 0.3(1.0) 0.3(1.0) 2.1(6.9) 2.1(6.9) 1.5(4.9) 1.5(4.9) 0.3(1.0) 0.3(1.0) 0.9(3.0) 0.9(3.0) 0.3(1.0) 0.3(1.0) 6000 5000 4000 3000 2000 1000 (236.22) (196.85) (157.48) (118.11) (78.74) (39.37) Floor distance [ mm (inch) ]...
- Page 49 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2024 MITSUBISHI ELECTRIC CORPORATION Published: Dec. 2024. No. OBD956 Made in Japan Specifications are subject to change without notice.
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