Mitsubishi Electric MSZ-WR18NA Service Manual
Split-type air conditioners
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Also See for MSZ-WR18NA:
- Operating instructions manual (33 pages) ,
- Service manual (40 pages)
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INDOOR UNIT
INDOOR UNIT
SERVICE MANUAL
Models
MSZ-WR09NA
MSZ-WR12NA
MSZ-WR18NA
MSZ-WR24NA
MSZ-WR24NA
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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-WR•NA Series (OBH819)
CONTENTS
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································5
4. OUTLINES AND DIMENSIONS ·····················7
5. WIRING DIAGRAM ·····································8
6. REFRIGERANT SYSTEM DIAGRAM ·············9
7. SERVICE FUNCTIONS ······························ 10
8. MICROPROCESSOR CONTROL ················ 12
9. TROUBLESHOOTING ······························· 16
10. DISASSEMBLY INSTRUCTIONS ················· 30
PARTS CATALOG (OBB818)
No. OBH818
2
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Table of Contents
Related Manuals for Mitsubishi Electric MSZ-WR18NA
Summary of Contents for Mitsubishi Electric MSZ-WR18NA
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Page 1: Table Of Contents
INDOOR UNIT INDOOR UNIT No. OBH818 SERVICE MANUAL Models MSZ-WR09NA MSZ-WR12NA MSZ-WR18NA MSZ-WR24NA Outdoor unit service manual MUZ-WR•NA Series (OBH819) CONTENTS 1. TECHNICAL CHANGES · ······························· 2. PART NAMES AND FUNCTIONS ··················3 3. SPECIFICATION ········································5 4. OUTLINES AND DIMENSIONS ·····················7 5. -
Page 2: Technical Changes
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. TECHNICAL CHANGES MSZ-WR09NA MSZ-WR12NA MSZ-WR18NA MSZ-WR24NA 1. New model OBH818... -
Page 3: Part Names And Functions
PART NAMES AND FUNCTIONS MSZ-WR09NA MSZ-WR12NA Air lter Front panel Air cleaning lter (Anti-Allergy Enzyme Filter, option) Air inlet Heat exchanger Air outlet Horizontal vane Remote controller Display section Remote control receiving section Operation indicator lamp Emergency operation switch ACCESSORIES Installation plate Attachment screws for the installation plate 4 ×... - Page 4 MSZ-WR18NA MSZ-WR24NA Air inlet Front panel Air lter Air cleaning lter Heat exchanger (Anti-Allergy Enzyme Filter, option) Air outlet Horizontal vane Remote controller Display section Remote control receiving section Operation indicator lamp Emergency operation switch ACCESSORIES Installation plate Attachment screws for the installation plate 4 ×...
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Page 5: Specification
Munsell 1.0Y 9.2/0.2 Control voltage (by built-in transformer) 12 - 24 V DC NOTE: Test conditions are based on AHRI 210/240. Indoor model MSZ-WR18NA MSZ-WR24NA Power supply V, phase, Hz 208/230, 1, 60 Max. fuse size (time delay)/ Disconnect switch Min. - Page 6 20.6 29.5 ing to the size of the room and furniture 16.3 23.5 MSZ-WR12NA arranged inside the room. COOL 14.5 21.0 HEAT 28.5 42.6 28.5 42.6 MSZ-WR18NA COOL 25.6 38.4 HEAT 32.0 47.7 32.0 47.7 MSZ-WR24NA COOL 28.8 43.1 OBH818...
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Page 7: Outlines And Dimensions
Liquid line ø1/4 19 - 11/16 (Flared connection ø1/4) Gas line ø3/8 16 - 15/16 (Flared connection: ø3/8 Drain hose Insulation ø1-1/8 O.D Connected part ø5/8 O.D MSZ-WR18NA MSZ-WR24NA 7/16×13/16 Oblong hole Installation plate 1×7/16 Oblong hole 3-11/16 Indoor unit... -
Page 8: Wiring Diagram
WIRING DIAGRAM MSZ-WR09NA MSZ-WR12NA MSZ-WR18NA MSZ-WR24NA OBH818... -
Page 9: Refrigerant System Diagram
RT11 Flared connection Refrigerant pipe ø1/4 (ø6.35) (with heat insulator) Refrigerant flow in cooling Refrigerant flow in heating MSZ-WR18NA MSZ-WR24NA Refrigerant pipe ø1/2 (ø12.7) (MSZ-WR18NA) ø5/8 (ø15.88) (MSZ-WR24NA) (with heat insulator) Indoor coil Indoor thermistor heat RT12 (main) exchanger... -
Page 10: Service Functions
SERVICE FUNCTIONS MSZ-WR09NA MSZ-WR12NA MSZ-WR18NA MSZ-WR24NA 7-1. TIMER SHORT MODE For service, the set time can be shortened by bridging of the timer short point on the indoor electronic control P.C. board. The time will be shortened as follows. (Refer to 9-7.) •... - Page 11 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 shut-off of the main power.
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Page 12: Microprocessor Control
MICROPROCESSOR CONTROL MSZ-WR09NA MSZ-WR12NA MSZ-WR18NA MSZ-WR24NA WIRELESS REMOTE CONTROLLER Signal transmitting section Distance of signal: About 20ft. (6 m) Beep(s) is (are) heard from the indoor unit when the signal is received. Operation display section STOP/OPERATE (OFF/ON) button FAN speed control button... - Page 13 8-2. DRY ( ) OPERATION (1) Press STOP/OPERATE (OFF/ON) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with OPERATION SELECT button. (3) The set temperature is determined from the initial room temperature. 1.
- Page 14 (4) VANE AUTO ( ) mode In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room tempera- ture distribution. MSZ-WR09/12NA In COOL and DRY operation In HEAT operation Vane angle is fixed to Horizontal position. Vane angle is fixed to Angle 5.
- Page 15 8-6. EMERGENCY/TEST OPERATION In the case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the right side of the indoor unit. Emergency operation is available when the remote controller is missing or has failed, or when the batteries in the remote controller are running down.
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Page 16: Troubleshooting
TROUBLESHOOTING MSZ-WR09NA MSZ-WR12NA MSZ-WR18NA MSZ-WR24NA 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 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 18 2. Indoor unit failure mode table Upper lamp of OP- Abnormal point ERATION INDICA- Condition Remedy (Failure mode) TOR 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 dur- 0.5-second thermistor...
- Page 19 9-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit operates. Indoor unit does Indoor unit oper- OPERATION INDICATOR Outdoor unit does ates. not receive the lamp on the indoor unit is not operate normally. signal from re- Outdoor unit blinking ON and OFF. does not operate.
- Page 20 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. OPERATION INDICATOR Blinking Not lit...
- Page 21 9-5. TROUBLE CRITERION OF MAIN PARTS MSZ-WR09NA MSZ-WR12NA MSZ-WR18NA MSZ-WR24NA 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", 1 or 2. "Indoor electronic Indoor coil thermistor control P.C.
- Page 22 9-6. TROUBLESHOOTING FLOW A Check of indoor fan motor The indoor fan motor error has occurred, and the indoor fan does not operate. Pay enough attention to the high voltage on the fan motor connector. Turn OFF the power supply. Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch.
- Page 23 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 24 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/ open circuit: motor connector CN151 from the indoor motor.
- Page 25 D How to check miswiring and serial signal error MSZ-WR09/12NA 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 outdoor terminal block S1 and S2? Check the wiring.
- Page 26 MSZ-WR18/24NA 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 outdoor terminal block S1 and S2? Check the wiring. Press EMERGENCY OPERATION switch once. Does the OPERATION INDICATOR lamp light up? <Confi...
- Page 27 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.(3 m), the indoor unit, and/or the antennas and the or is the distance between the antennas outdoor unit.
- Page 28 9-7. Test point diagram and voltage MSZ-WR09/12NA 1. Indoor power P.C. board, Indoor terminal P.C. board Indoor terminal P.C. board Indoor power P.C. board Varistor (NR11) Resistor (R111) Fuse (F11)( ) Indoor fan motor (CN211) (+)0-6 V (+)3-6 V DC 15 V DC (–) GND (high- voltage DC)
- Page 29 MSZ-WR18NA MSZ-WR24NA 1. Indoor power P.C. board Connector to indoor electronic 12 V DC 5 V DC control P.C. board (CN20A) Connector to Terminal block (CN201) Fuse (F11) T3.15AL250V Varistor (NR11) Connector to Indoor fan motor (CN211) Resistor (R111) 294/325 V DC...
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Page 30: 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 terminals 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/FIGURES Electrical box 2. Removing the indoor electronic control P.C. Photo 2 Ground wire board and the room temperature thermistor (1) Remove the panel (Refer to section 1.) and the corner box. Screw of the (2) Remove the screw of the V.A. clamp and the V.A. electrical cover clamp.
- Page 32 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the nozzle assembly Photo 5 (1) Remove the panel (Refer to section 1.) and the corner box. (2) Remove the indoor/outdoor connecting wire (Refer to section 2 (2)-(7).). (3) Remove the indoor electronic control P.C. board hold- (4) Pull out the drain hose from the nozzle assembly and remove the nozzle assembly.
- Page 33 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the indoor fan motor, the indoor coil Photo 6 thermistor, and the line flow fan (1) Remove the panel (Refer to section 1.) and the corner box. (2) Remove the indoor electronic control P.C. board hold- er, the electrical box and the nozzle assembly.
- Page 34 10-2. MSZ-WR18NA MSZ-WR24NA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the panel Photo 1 (1) Remove the screw caps on the panel and remove the Front panel screws of the panel. (2) Pull the panel slightly toward you, and then remove the panel by pushing it upward.
- Page 35 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the indoor power P.C. board and the Photo 2 electrical box (1) Remove the panel. (Refer to section 1.) Remove the Screws of right corner box. the ground plate Water cover (2) Disconnect the following connectors: <Indoor electronic control P.C.
- Page 36 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the indoor electronic control P.C. Photo 5 board Control P.C. board holder (Inside) (1) Remove the panel. (Refer to section 1.) Remove the right Catch corner box. Indoor electronic (2) Disconnect the following connectors: control P.C. board <Indoor electronic control P.C.
- Page 37 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the indoor fan motor, the indoor coil Photo 7 thermistor and the line flow fan (1) Remove the panel. (Refer to section 1.) Remove the right corner box. (2) Remove the control P.C. board holder, the water cover, the electrical box and the nozzle assembly.
- Page 38 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 2018 MITSUBISHI ELECTRIC CORPORATION Published: Sep. 2018. No. OBH818 Specifications are subject to change without notice.