Table of Contents
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
Wireless type
Models
MSZ-A18YV -
MSZ-A24YV -
MSZ-A26YV -
Indication of model name
MSZ-A18YV -
MSZ-A24YV -
MSZ-A26YV -
NOTE:
This service manual describes technical data of the indoor unit.
•Refer to the service manual OB346 when MSZ-A18YV -
is connected with MUZ-A18YV -
•Refer to the service manual OB319 when MSZ-A18YV -
is connected with MXZ-A26WV -
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CONTENTS
1. PART NAMES AND FUNCTIONS······················2
2. SPECIFICATION·················································4
3. NOISE CRITERIA CURVES ·······························5
4. OUTLINES AND DIMENSIONS ·························6
5. WIRING DIAGRAM ············································7
6. REFRIGERANT SYSTEM DIAGRAM ················8
7. SERVICE FUNCTIONS ······································9
8. TROUBLESHOOTING······································11
9. DISASSEMBLY INSTRUCTIONS ····················19
10. PARTS LIST······················································21
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11. OPTIONAL PARTS ···········································23
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, MSZ-A24YV -
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, MUZ-A24YV -
or MUZ-A26YV -
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, MSZ-A24YV -
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or MXZ-A32WV -
as multi system units.
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or MSZ-A26YV -
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.
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or MSZ-A26YV -
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No. OB345
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Related Manuals for Mitsubishi Electric MSZ-A18YV
Summary of Contents for Mitsubishi Electric MSZ-A18YV
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Page 1: Table Of Contents
11. OPTIONAL PARTS ···········································23 MSZ-A24YV - MSZ-A26YV - NOTE: This service manual describes technical data of the indoor unit. •Refer to the service manual OB346 when MSZ-A18YV - , MSZ-A24YV - or MSZ-A26YV - is connected with MUZ-A18YV - , MUZ-A24YV - or MUZ-A26YV - •Refer to the service manual OB319 when MSZ-A18YV -... -
Page 2: Part Names And Functions
PART NAMES AND FUNCTIONS INDOOR UNIT MSZ-A18YV - MSZ-A24YV - MSZ-A26YV - Air cleaning filter (option) Grille (White bellows type) Air inlet To Breaker Power supply cord Catechin air filter Remote control receiving section Vertical vanes Horizontal vane Remote controller... -
Page 3: Remote Controller
REMOTE CONTROLLER MSZ-A18YV - MSZ-A24YV - MSZ-A26YV - Signal transmitting section Operation display section OPERATE /STOP (ON /OFF)button ON/OFF WARM COOL TEMPERATURE buttons Indication of remote controller model is on back. Open the front lid. CLOCK ON/OFF WARM COOL VANE button... -
Page 4: Specification
SPECIFICATION •Refer to the service manual OB346 when MSZ-A18YV - , MSZ-A24YV - or MSZ-A26YV - is connected with MUZ-A18YV - , MUZ-A24YV - or MUZ-A26YV - •Refer to the service manual OB319 when MSZ-A18YV - , MSZ-A24YV - or MSZ-A26YV -... -
Page 5: Noise Criteria Curves
Specifications and rating conditions of main electric parts INDOOR UNIT Model MSZ-A26YV - MSZ-A18YV - MSZ-A24YV - Item (C11) Indoor fan capacitor 2.5+ 440V (F11) Fuse 250V 3.15A (MV1/ MV2) Vane motor MP20/MP20 (NR11) Varistor TNR10V511K410 (SR141) Solid state relay... -
Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSZ-A18YV - Unit: mm MSZ-A24YV - MSZ-A26YV - INDOOR UNIT Installation plate Indoor unit 1068 414.5 414.5 Wall hole [75 Liquid line [ 6.35- 0.5m 1100 Air in Installation plate Gas line [ 12-0.43m Insulation [ 50 O.D [ 32 I.D... -
Page 7: Wiring Diagram
WIRING DIAGRAM MSZ-A18YV - MODEL WIRING DIAGRAM INDOOR UNIT RT13 TO OUTDOOR HIC1 UNIT RT12 CONNECTING CN201 CN112 NR11 TRANS SR141 TAB12 POWER SUPPLY CN211 CORD RT11 ELECTRONIC CONTROL P.C. BOARD ~/N 230V 50Hz RECEIVER DISPLAY CIRCUIT P.C. BOARD P.C. BOARD... -
Page 8: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MSZ-A18YV - MSZ-A24YV - Unit:mm INDOOR UNIT INDOOR UNIT Refrigerant pipe [15.88 Refrigerant pipe [12.7 (with heat insulator) (with heat insulator) Indoor coil Indoor coil thermistor Indoor Indoor thermistor RT12(main) RT12(main) heat heat exchanger exchanger Distributor Distributor... -
Page 9: Service Functions
SERVICE FUNCTIONS MSZ-A18YV - MSZ-A24YV - MSZ-A26YV - 7-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. The time will be shortened as follows. Set time : 1 minute... - Page 10 How to release “AUTO RESTART FUNCTION” Turn off the main power for the unit. Pull out the electronic control P.C. board, the receiver P.C. board and the display P.C.board. (Refer to page 19.) Solder jumper wire to the RESISTOR JR07 on the indoor electronic control P.C.
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Page 11: Troubleshooting
TROUBLESHOOTING MSZ-A18YV - MSZ-A24YV - MSZ-A26YV - 8-1. Cautions on troubleshooting 1. Before troubleshooting, check the following: (1) Check the power supply voltage. (2) Check the indoor/outdoor connecting wire for mis-wiring. 2. Take care the following during servicing. (1) Before servicing the air conditioner, be sure to first turn off the remote controller to stop the main unit, and then after confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug. - Page 12 8-2. Instruction of troubleshooting Start Indoor unit Indoor unit operates. Indoor unit OPERATION INDICATOR operates. Outdoor unit doesn't doesn't receive lamp on the indoor unit is Outdoor unit operate normally. the signal from flashing on and off. doesn't remote controller. operate.
- Page 13 1. Troubleshooting check table • The following indication applies regardless of shape of the indicator. · Flashing of the OPERATION INDICATOR lamp (the left-hand side lamp) indicates Operation Indicator Lighted possible abnormalities. · The OPERATION INDICATOR lamp (the left-hand side lamp) is lighting during Not lighted normal operation.
- Page 14 2. Trouble criterion of main parts MSZ-A18YV - MSZ-A24YV - MSZ-A26YV - Part name Figure Check method and criterion Measure the resistance with a tester. Room temperature (Part temperature 10˚C ~ 30˚C) thermistor(RT11) Normal Abnormal Indoor coil thermistor Open or short-circuit 8 k"...
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Page 15: A Check Of Indoor Fan Motor
When OPERATION INDICATOR lamp flashes 3-time. Indoor fan motor doesn’t operate. Check of indoor fan motor Turn OFF the power supply. Check connector CN211 visually. Is soldered point of the connector Are lead wires connected? Resolder it. correctly soldered? Reconnect the lead wires. Disconnect lead wires from connector CN211 on the indoor electronic control P.C. -
Page 16: Check Of Indoor Electronic Control P.c. Board
The unit doesn’t operate with the remote controller. Also, the OPERATION INDICATOR lamp doesn’t light up by press- ing the EMERGENCY OPERATION switch. Check of indoor electronic control P.C. board Check the both “parts side” and “pattern Varistor (NR11) side” of indoor electronic control P.C. board visually. - Page 17 When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit doesn’t operate. How to check mis-wiring and serial signal error (when outdoor unit does not work) Start • Turn ON the power supply (Indoor/ outdoor unit). • Press once EMERGENCY OPERATION switch. w Short circuit of JPG and JPS on the indoor After 3 minutes, mis-wiring is indicated electronic control P.C.
- Page 18 TEST POINT DIAGRAM AND VOLTAGE MSZ-A18YV - MSZ-A24YV - MSZ-A26YV - Indoor electronic control P.C. board Fan motor power supply Power supply input 230V AC 5V DC Fuse (F11) 250V AC 3.15A Room temperature ther- mistor(RT11) R132 Indoor coil thermistor(RT12(main))
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Page 19: Disassembly Instructions
1Hold the sleeve, and 2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector MSZ-A18YV - MSZ-A24YV - MSZ-A26YV - INDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the front panel Photo 1 (1) Remove the screw caps of the front panel. - Page 20 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box Photo 3 Screws of the ground wire (1) Remove the front panel. (Refer to 1.) (2) Remove the electrical cover. (Refer to 2.) (3) Disconnect the connector of the indoor coil thermistor. (4) Disconnect the motor connector (CN211 and CN121) and the vane motor connector (CN151) on the electronic control P.C.
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Page 21: Parts List
PARTS LIST MSZ-A18YV - (WH) MSZ-A24YV - (WH) MSZ-A26YV - (WH) 10-1. INDOOR UNIT STRUCTURAL PARTS 10-2. INDOOR UNIT HEAT EXCHANGER CATCH Optional parts (See page 23.) SCREW 10-1. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. -
Page 22: Electrical Parts
MSZ-A18YV - (WH) MSZ-A24YV - (WH) MSZ-A26YV - (WH) 10-4. ACCESSORY AND 10-3. INDOOR UNIT FUNCTIONAL PARTS AND REMOTE CONTROLLER ELECTRICAL PARTS SLEEVE BEARING ROOM TEMPERATURE THERMISTOR 15 16 VARISTOR FUSE 10-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. -
Page 23: Optional Parts
Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. DO NOT reuse AIR CLEANING FILTER even if it is washed. DO NOT remove or attach AIR CLEANING FILTER during unit operation. Model Part No. MSZ-A18YV - MSZ-A24YV - MAC-1700FT MSZ-A26YV - Air cleanig filter (White bellows type) - Page 24 HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C C Copyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Apr. 2004. No.OB345 6 New publication, effective Apr. 2004 Made in Japan Specifications subject to change without notice.