Mitsubishi Electric MS-A18WV Service Manual
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Also See for MS-A18WV:
- Operating instructions manual (15 pages) ,
- Operating instructions manual (16 pages)
Table of Contents
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SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Wireless type
Models
MS-A18WV -
MS-A24WV -
MS-A30WV -
Indication of model name
MS-A18WV -
MS-A24WV -
MS-A30WV -
NOTE:
This service manual describes technical data of the indoor units.
As for outdoor units MU-A18WV-
OB326.
( WH )
E1
( WH )
E1
( WH )
E1
CONTENTS
E1
10. TROUBLESHOOTING······································19
E1
11. DISASSEMBLY INSTRUCTIONS·····················27
E1
12. PARTS LIST······················································29
13. OPTIONAL PARTS···········································31
, MU-A24WV-
and MU-A30WV-
E1
E1
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
3. SPECIFICATION·················································4
4. NOISE CRITERIA CURVES ·······························5
5. OUTLINES AND DIMENSIONS ·························6
6. WIRING DIAGRAM ············································7
7. REFRIGERANT SYSTEM DIAGRAM ················8
8. MICROPROCESSOR CONTROL ······················9
9. SERVICE FUNCTIONS ····································17
, refer to service manual
E1
No. OB325
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Table of Contents
Related Manuals for Mitsubishi Electric MS-A18WV
Summary of Contents for Mitsubishi Electric MS-A18WV
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Page 1: Table Of Contents
SPLIT-TYPE, AIR CONDITIONERS No. OB325 SERVICE MANUAL Wireless type Models MS-A18WV - ( WH ) MS-A24WV - ( WH ) MS-A30WV - ( WH ) CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················2 3. SPECIFICATION·················································4 4. NOISE CRITERIA CURVES ·······························5 5. -
Page 2: Technical Changes
TECHNICAL CHANGES MS-18RV - MS-A18WV - 1. Indoor unit model has changed. 2. Rated voltage has changed. (220V-240V 230V) 3. Remote controller has changed. • LONG MODE and WIDE MODE have been added. 4. Indoor fan motor has changed.(RA4V27-EF RC4V32-AA) 5. - Page 3 REMOTE CONTROLLER MS-A18WV - MS-A24WV - MS-A30WV - 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...
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Page 4: Specification
SPECIFICATION Indoor model MS-A18WV - MS-A24WV - Cooling Cooling Function Single phase Single phase Power supply 230V, 50Hz 230V, 50Hz Capacity Air flow(High/Med. /Low ) K /h 768/642 /528 768/672 /588 Power outlet Running current 0.30 0.30 Power input —... -
Page 5: Noise Criteria Curves
NOISE CRITERIA CURVES MS-A18WV- MS-A24WV- FAN SPEED SPL(dB(A)) LINE FAN SPEED SPL(dB(A)) LINE High High Test conditions, Test conditions, Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: NC-70 NC-70 NC-60 NC-60 NC-50... -
Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS MS-A18WV - Unit: mm MS-A24WV - MS-A30WV - INDOOR UNIT Installation plate Indoor unit 1068 414.5 414.5 Wall hole [ 75 1100 Liquid line [ 6.35- 0.5m Installation plate Gas line [ 12-0.43m Insulation [ 50 O.D [ 32 I.D... -
Page 7: Wiring Diagram
WIRING DIAGRAM MS-A18WV - MS-A24WV - MODELS WIRING DIAGRAM INDOOR UNIT TO OUTDOOR UNIT CN202 CONNECTING HIC1 RT12 CN112 CN201 NR11 TRANS SR141 TAB12 POWER SUPPLY CN211 CORD ELECTRONIC CONTROL ~/N 230V RT11 P. C. BOARD 50Hz CIRCUIT RECEIVER DISPLAY BREAKER P. -
Page 8: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MS-A18WV - MS-A24WV - 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 heat RT12 heat exchanger exchanger Distributor Distributor... -
Page 9: Microprocessor Control
MICROPROCESSOR CONTROL MS-A18WV - MS-A24WV - MS-A30WV - WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE/ STOP (ON/ OFF)button ON/OFF WARM COOL TEMPERATURE buttons CLOCK ON/OFF WARM COOL VANE button FAN SPEED CONTROL button STOP (Horizontal vane button) - Page 10 • Once the mode is fixed, the mode does not change by room temperature afterwards. • Under the ON-TIMER ( ) operation, mode is determined according to the room temperature at the set time the operation starts. • When the system is stopped on the remote controller, and restarted within 2 hours in “I FEEL CONTROL” ( ) mode, the system operates in previous mode automatically regardless of the room temperature.
- Page 11 The indoor fan operates at the set speed and the compressor stops for 5 minutes. After that, if RT12 still reads below 0°C(MS-A18WV)/ 3°C(MS-A24WV)/ RT12 or RT13 still reads below-1°C (MS- A30WV) this mode prolonged until the RT12 reads over 0°C(MS-A18WV)/ 3°C(MS-A24WV) / RT12 or RT13 still reads- over-1°C(MS-A30WV).
- Page 12 Operation time chart Example Thermostat Indoor fan Outdoor fan Compressor 8 min. 1 min. 3 min. 4 min. 3. Coil frost prevention • The operation is as same as coil frost prevention during COOL mode of “I FEEL CONTROL”. • Indoor fan operates at the set speed and the compressor stops for 5 minutes, because protection(Coil frost prevention) has the priority.
- Page 13 8-5. INDOOR FAN MOTOR CONTROL (1) Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feedback the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (High, Med., Low), the microprocessor controls SR141 and adjusts fan motor electric current to make the current rota- tional frequency close to the target rotational frequency.
- Page 14 (8) ECONO COOL ( ) operation (ECONOmical operation) When the ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher than that in COOL mode. Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger(Tp (w 1) SWING operation makes you feel cooler than set temperature.
- Page 15 2. Vertical vane (1) Vane motor drive These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approx. 12V) transmitted from microprocessor. (2) The vertical vane angle and mode change as follows by pressing the WIDE VANE button. SWING (3) Positioning The vane is once pressed to the vane stopper to confirm the standard position and then set to the desired angle.
- Page 16 2. Cancel TIMER setting can be cancelled with the ON/OFF TIMER buttons. To cancel the ON timer, press the “ON-TIMER” button. To cancel the OFF timer, press the “OFF-TIMER” button. TIMER is cancelled and the display of set time disappears. PROGRAM TIMER •...
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Page 17: Service Functions
SERVICE FUNCTIONS MS-A18WV - MS-A24WV - MS-A30WV - 9-1. 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 18 Table 1 1 unit operation 2 units operation 3 units operation 4 units operation No. 1 unit No modification Same as at left Same as at left Same as at left No. 2 unit – Solder J1 Same as at left Same as at left No.
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Page 19: Troubleshooting
TROUBLESHOOTING MS-A18WV - MS-A24WV - MS-A30WV - 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 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 20 10-2. Instruction of troubleshooting Start Indoor unit Indoor unit Indoor unit operates. OPERATION INDICATOR operates. doesn't receive Outdoor unit lamp on the indoor unit is Outdoor unit the signal from doesn't operate flashing on and off. doesn't remote controller. normally. operate.
- Page 21 1. Troubleshooting check table • The following indication applies regardless of shape of the indicator. flashing · Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible Operation Indicator abnormalities. · The OPERATION INDICATOR lamp (on the left-hand side) is lighted during normal operation. Before taking measures, make sure that the symptom reappears, for accurate troubleshooting.
- Page 22 2. Trouble criterion of main parts MS-A18WV - MS-A24WV - MS-A30WV - Figure Part name Check method and criterion Room temperature Measure the resistance with a tester. (Part temperature 10˚C ~ 30˚C) thermistor(RT11) Normal Abnormal Indoor coil thermistor Open or short-circuit 8 k"...
- Page 23 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 24 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 25 When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit doesn’t operate. How to check mis-wiring MS-A30WV w Short circuit of JPG and JPS on the indoor electronic control P.C. board enables self -check to be displayed in 3 seconds. Start •...
- Page 26 TEST POINT DIAGRAM AND VOLTAGE MS-A18WV - MS-A24WV - MS-A30WV - 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 27: Disassembly Instructions
1Hold the sleeve, and 2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector MS-A18WV - MS-A24WV - MS-A30WV - INDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the front panel Photo 1 (1) Remove the screw caps of the front panel. - Page 28 OPERATING PROCEDURE PHOTOS Photo 3 3. Removing the electrical box 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 29: Parts List
PARTS LIST MS-A18WV - (WH) MS-A24WV - (WH) MS-A30WV - (WH) 12-1. INDOOR UNIT STRUCTURAL PARTS 12-2. INDOOR UNIT HEAT EXCHANGER CATCH Optional parts SCREW (See page 31.) 12-1. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. -
Page 30: Electrical Parts
MS-A18WV - (WH) MS-A24WV - (WH) MS-A30WV - (WH) 12-4. ACCESSORY AND 12-3. INDOOR UNIT FUNCTIONAL PARTS AND REMOTE CONTROLLER ELECTRICAL PARTS SLEEVE BEARING ROOM TEMPERATURE THERMISTOR 15 16 VARISTOR FUSE 12-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. -
Page 31: 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. MS-A18WV- MS-A24WV- MAC-1700FT MS-A30WV- Air cleanig filter (White bellows type) - Page 32 HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C C Copyright 2003 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Dec. 2003. No.OB325 6 New publication, effective Dec. 2003 Made in Japan Specifications subject to change without notice.