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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-HX09NL
MSZ-HX12NL
MSZ-HX18NL
MSZ-HX24NL
MSZ-HX18NL
MSZ-HX24NL
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U1
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U1
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U1
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U1
Outdoor unit service manual
MUZ-HX•NL Series (OBH953)
CONTENTS
1. TECHNICAL CHANGES ······························ 3
USING REFRIGERANT R454B ····················· 4
3. PART NAMES AND FUNCTIONS ·················· 9
4. SPECIFICATION ········································ 11
5. OUTLINES AND DIMENSIONS ····················13
6. WIRING DIAGRAM ····································15
7. REFRIGERANT SYSTEM DIAGRAM ············16
8. SERVICE FUNCTIONS ·······························17
9. MICROPROCESSOR CONTROL ··················19
10. TROUBLESHOOTING ································26
11. DISASSEMBLY INSTRUCTIONS ··················41
PARTS CATALOG (OBB952)
Revision A:
• MSZ-HX09/12NL -
have been
U1
added.
OBH952 is void.
No. OBH952
REVISED EDITION-A
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MUZ-HX NL Series
Summary of Contents for Mitsubishi Electric MUZ-HX NL Series
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Page 1: Table Of Contents
Revision A: • MSZ-HX09/12NL - have been added. OBH952 is void. INDOOR UNIT No. OBH952 REVISED EDITION-A SERVICE MANUAL Models MSZ-HX09NL MSZ-HX12NL MSZ-HX18NL MSZ-HX24NL Outdoor unit service manual MUZ-HX•NL Series (OBH953) CONTENTS 1. TECHNICAL CHANGES ······························ 3 2. SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R454B ·····················... - Page 2 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.
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Page 3: Technical Changes
TECHNICAL CHANGES MSZ-HX18NL - MSZ-HX24NL - 1. New model MSZ-HX09NL - MSZ-HX12NL - 1. New model OBH952A... -
Page 4: Servicing Precautions For Units Using Refrigerant R454B
SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R454B Servicing precautions for units using refrigerant R454B Refrigerant WARNING Safety Group 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 5 2. Additional refrigerant charge Additional refrigerant charge Refrigerant for the indoor units and the extended piping is not included in the outdoor unit when the unit is shipped from the factory. Therefore, charge each refrigerant piping system with additional refrigerant at the installation site. In addition, in order to carry out service, enter the size and length of each liquid pipe and additional refrigerant charge amounts in the spaces pro- vided on the “Refrigerant amount”...
- Page 6 3. Cautions for the unit using R454B refrigerant Basic work procedures are the same as those for conventional units using refrigerant R410A. However, pay careful attention to the following points. ■ Information on servicing 1. Checks to the area Prior to beginning work on systems containing FLAMMABLE REFRIGERANTS, safety checks are necessary to ensure that the risk of ignition is minimized.
- Page 7 ■ Repairs to sealed components Sealed electrical components shall be replaced. ■ Repair to intrinsically safe components Intrinsically safe components must be replaced. ■ Cabling Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse environmental effects.
- Page 8 ■ Decommissioning Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its detail. It is recommended good practice that all refrigerants are recovered safely. Prior to the task being carried out, an oil and refrigerant sample shall be taken in case analysis is required prior to re-use of recovered refrigerant.
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Page 9: Part Names And Functions
PART NAMES AND FUNCTIONS MSZ-HX09NL MSZ-HX12NL Front panel Air inlet Air filter (V air filter) Heat exchanger Air outlet Fan guard Horizontal vane Air cleaning filter (Electrostatic anti-allergy enzyme filter, option) (Microparticle catching filter, option) Operation indicator lamp Remote controller Remote control receiving section Emergency operation switch ACCESSORIES... - Page 10 MSZ-HX18NL MSZ-HX24NL Front panel Air inlet Air filter (V air filter) Air outlet Air cleaning filter (Electrostatic anti-allergy enzyme filter, Heat option) exchanger (Microparticle catching filter, option) Remote controller Fan guard Horizontal vane Remote control receiving section Operation indicator lamp Emergency operation switch ACCESSORIES (1) Installation plate...
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Page 11: Specification
SPECIFICATION Model MSZ-HX09NL MSZ-HX12NL Power supply V, phase, Hz 208/230, 1, 60 Disconnect switch Min. circuit ampacity Fan motor output 0.040 COOL Dry 379 - 296 - 211 - 144 475 - 338 - 246 - 168 Airflow (Wet) (342 - 267 - 190 - 129) (428 - 304 - 221- 151) Super High - High - Med. -
Page 12: Operation
4-1. OPERATING RANGE (1) POWER SUPPLY Rated voltage Guaranteed voltage (V) 208/230 V Min. 187 Max. 253 Indoor unit 1 phase 60 Hz (2) OPERATION Intake air temperature (°F) Mode Condition Standard temperature Maximum temperature Cooling Minimum temperature Maximum humidity Standard temperature Heating Maximum temperature... -
Page 13: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSZ-HX09NL MSZ-HX12NL Unit: inch OBH952A... - Page 14 MSZ-HX18NL MSZ-HX24NL Unit: inch OBH952A...
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Page 15: Wiring Diagram
WIRING DIAGRAM MSZ-HX09NL MSZ-HX12NL MSZ-HX18NL MSZ-HX24NL OBH952A... -
Page 16: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MSZ-HX09NL MSZ-HX12NL Unit: inch (mm) Refrigerant pipe ø3/8 (ø9.52) (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 (ø6.35) (with heat insulator) Refrigerant flow in cooling Refrigerant flow in heating... -
Page 17: Service Functions
SERVICE FUNCTIONS MSZ-HX09NL MSZ-HX12NL MSZ-HX18NL MSZ-HX24NL 8-1. TIMER SHORT MODE For service, the following set time can be shortened by bridging the timer short mode point on the electronic control P.C. board. The time will be shortened as follows. (Refer to 10-7.) Set time : 1-minute 1-second Set time : 3-minute... -
Page 18: Auto Restart Function
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. -
Page 19: Microprocessor Control
MICROPROCESSOR CONTROL MSZ-HX09NL MSZ-HX12NL MSZ-HX18NL MSZ-HX24NL WIRELESS REMOTE CONTROLLER Signal transmitting section Distance of signal: About 20 feet (6 m) Beep(s) is (are) heard from the indoor unit when the signal is received. Battery replacement indicator Operation select button FAN speed control button ECONO COOL button VANE control button SMART SET button... -
Page 20: Dry Operation
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 –... - Page 21 9-5. AUTO VANE OPERATION 1. 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.
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Page 22: Timer Operation
9-6. 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 dis- play of TIME MONITOR, so set the current time correctly with CLOCK button. How to set the current time (a) Press the CLOCK button. -
Page 23: Weekly Timer Operation
9-7. 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 24: Self Clean Operation
(4) Press button to complete and transmit the weekly timer setting. which was blinking 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 25 9-10. EMERGENCY/TEST OPERATION In case of test run operation or emergency operation, use the emergency operation switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of the remote controller run down.
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Page 26: Troubleshooting
TROUBLESHOOTING MSZ-HX09NL MSZ-HX12NL MSZ-HX18NL MSZ-HX24NL 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 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 27 10-2. FAILURE MODE RECALL FUNCTION AND ERROR CODE DISPLAY MODE Outline of the function This air conditioner can memorize the failure which has occurred last time. Even though LED indication listed on the troubleshooting check table (10-4.) disappears, the memorized failure can be recalled.
- Page 28 A (From previous page) Press OFF/ON (stop/operate) button of the remote controller with the remote controller headed towards the indoor unit. *1. The indoor unit is normal, but the outdoor unit might be abnormal. Does the left/upper OPERATION INDICATOR lamp There are some abnormalities that cannot be recalled with this way.
- Page 29 2. Flow chart of error code display mode This explains how customers can check the error code on their own. This is included in OPERATING INSTRUCTIONS. Operational procedure The remote controller is powered OFF. Get close to the front of the indoor unit. Point the remote controller at the receiving section of the indoor unit, and keep pressing CHECK with a fine- tipped object.
- Page 30 3. Table of indoor unit failure mode recall function The left/upper lamp Error Abnormal point of the operation Condition Remedy code (Failure mode) indicator lamp Not lit Normal — — Room The room temperature thermistor short or 1-time blink every Refer to the characteristics of the room tempera- temperature open circuit is detected every 8 seconds...
- Page 31 10-3. INSTRUCTION OF TROUBLESHOOTING *2 There is possibility that diesel explosion may occur due to the air mixed in the refrigerant circuit. 1. Check of the unit. First, ensure that there are no leakage points on the valves, flare connec- tions, etc.
- Page 32 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 the operation indicator lamp blinks. •...
- Page 33 10-5. TROUBLESHOOTING CRITERION OF MAIN PARTS MSZ-HX09NL MSZ-HX12NL MSZ-HX18NL MSZ-HX24NL Part name Check method and criterion Figure Room temperature thermistor Measure the resistance with a multimeter. (RT11) Indoor coil thermistor Refer to 10-7. “Test point diagram and voltage”, “Indoor electronic control (RT12 (MAIN), RT13 (SUB)) P.C.
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Page 34: 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. Turn ON the power supply, wait 5 seconds or more, and then press the emergency operation switch. - Page 35 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 *1 Look at the image of the signal transmitting section of on the remote controller. the remote controller through the monitor of a digital camera or a camera phone.
- Page 36 C Check of indoor electronic control P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211 and vane motor Short/ open circuit: Measure the resistance between CN211 Replace the indoor fan motor. connector CN151 from the indoor electronic control P.C. board of the indoor fan motor connector.
- Page 37 D How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage AC in Check the power supply. the power supply? Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and Check the wiring.
- Page 38 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., or is the indoor unit, and/or the antennas and the out- the distance between the antennas and door unit.
- Page 39 10-7. TEST POINT DIAGRAM AND VOLTAGE Indoor terminal P.C. board, Indoor electronic control P.C. board, Power monitor receiver SW P.C. board MSZ-HX09NL MSZ-HX12NL Indoor terminal P.C. board Terminal block To disable “Auto restart function” Fuse cut the Jumper wire to JR77. (F11) (Refer to 8-3.) Varistor...
- Page 40 Indoor terminal P.C. board, Indoor electronic control P.C. board, Power monitor receiver SW P.C. board MSZ-HX18NL MSZ-HX24NL Indoor terminal P.C. board Terminal block To disable “Auto restart function” Fuse cut the Jumper wire to JR77. (F11) (Refer to 8-3.) Varistor (NR11) Indoor electronic control P.C.
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Page 41: 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 42 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the indoor terminal P.C. board, indoor Photo 4 Water cover electronic control P.C. board, power monitor receiver SW P.C. board and the electrical box Tab of the <Removing the electrical box> ground wire (1) Remove the panel. (Refer to section 1.) Remove the corner box right .
- Page 43 OPERATING PROCEDURE PHOTOS/FIGURES <Removing the indoor terminal P.C. board, indoor elec- Photo 6 tronic control P.C. board and power monitor receiver Power monitor receiver holder Hooks SW P.C. board> (10) Disconnect the following connectors from the indoor electronic control P.C. board: CN10A (To the power monitor receiver SW P.C.
- Page 44 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the nozzle assembly and the vane Photo 7 motor <Removing the nozzle assembly> (1) Remove the panel. (Refer to section 1.) Remove the corner box right . (2) Remove the indoor/outdoor connecting wire and the electrical cover.
- Page 45 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the indoor fan motor, the indoor coil Photo 9 thermistor and the line flow fan (1) Remove the panel. (Refer to section 1.) Remove the corner box. (2) Remove the electrical box and the nozzle assembly. (Refer to section 2, 3.) (3) Remove the water cover.
- Page 46 OPERATING PROCEDURE PHOTOS/FIGURES (10) Remove the screws fixing the left side of the heat Photo 12 exchanger. (Photo 12) (11) Lift the heat exchanger, and pull out the line flow fan to the lower-left. (12) Disengage the catch on the right side of the heat exchanger, and remove the heat exchanger (Photo 13).
- Page 47 11-2. MSZ-HX18NL MSZ-HX24NL NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the panel Photo 1 Front panel (1) Unlock the locks of the horizontal vane (2 points). Pull and remove the horizontal vane to the side. (2) Remove the screw caps on the panel and remove the screws of the panel.
- Page 48 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the indoor terminal P.C. board, indoor Photo 4 electronic control P.C. board and the electrical Screws of the ground plate Water cover Screw of the (1) Remove the panel (refer to section 1). Remove the cor- electrical cover ner box right.
- Page 49 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the power monitor receiver SW P.C. Photo 6 Power monitor receiver holder (Inside) board Catch (1) Remove the panel. (Refer to section 1.) Remove the right corner box. (2) Remove the indoor/outdoor connecting wire and the electrical cover.
- Page 50 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the nozzle assembly and the vane Photo 8 motor (1) Remove the panel. (Refer to section 1.) Remove the corner box. (2) Remove the power monitor receiver holder, water cover and the electrical box. (Refer to section 2.) (3) Pull out the drain hose from the nozzle assembly and remove the nozzle assembly.
- Page 51 OPERATING PROCEDURE PHOTOS/FIGURES (9) Remove the screws fixing the left side and upper right Photo 11 side of the heat exchanger (Photo 12). (10) Lift the heat exchanger, and pull out the line flow fan to the lower-left. (11) Disengage the 2 catches on the right side of the heat exchanger, and remove the heat exchanger.
- Page 52 Do not pull the lead wire when removing the indoor coil thermistor. HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2024 MITSUBISHI ELECTRIC CORPORATION Issued: Nov. 2024. No. OBH952 REVISED EDITION-A Published: Oct. 2024. No. OBH952 Made in Japan Specifications subject to change without notice.
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