Mitsubishi Electronics MSH-07NV, MSH-09NV, MSH-12NV, MSH-18NV, MSH-24NV }

TEST POINT DIAGRAM AND VOLTAGE

MSH-24NV - MSH-18NV -

MSH-24NV - MSH-18NV - E3E2

E2E1

Fan motor power supply

Fuse AC 250V 3.15A

}Power supply input

AC 220-240V

+}DC5V

Indoor coil thermistor(RT12)

JPS

Time short mode point

JPS

Emergency operation switch

+}DC12V

P.C.board

DC0~20V

R132

Room temperature

thermistor(RT11)

C144

JPG

JP41

OB207t-3qxp 25/9/97 9:01 PM Page 58

Contents

Main SERVICE MANUAL SPLIT-TYPE,HEATPUMP AIR CONDITIONERS CONTENTS Wireless type Models MSH-24NV - (WH) MUH-24NV - TECHNICAL CHANGES 1 MSH-17NV - MSH-07NV - MSH-09NV - MSH-09NV - MSH-12NV - MSH-12NV - PART NAMES AND FUNCTIONS 2 Page Page SPECIFICATION 3 Page Page Page Page Page Page MSH-18NV - MSH-24NV - MSH-18NV - MSH-24NV - MSH-18NV - Unit: mm { MUH-18NV - MUH-18NV - MUH-18NV - MUH-24NV- MUH-24NV- OB207t-1qxp 25/9/97 8:52 PM Page 14 R20 WIRING DIAGRAM 5 MUH-09NV - MSH-07NV - MSH-09NV - MSH-12NV - MUH-12NV - MSH-18NV - MUH-18NV - MSH-24NV - MUH-24NV - MSH-07NV - MSH-09NV - MSH-12NV - MUH-07NV - MUH-09NV - MC MF MUH-12NV - E2 MODEL WIRING DIAGRAM MC MF MSH-18NV - MUH-18NV - MSH-24NV - MF MC MUH-24NV - MF MC REFRIGERANT SYSTEM DIAGRAM 6 MSH-09NV - MUH-07NV - MSH-07NV - MSH-07NV - MSH-12NV - MSH-12NV - MUH-12NV - MSH-24NV - MSH-24NV - MUH-24NV - MAX. HEIGHT DIFFERENCE ADDITIONAL REFRIGERANT CHARGE(R-22 : g) MAX. REFRIGERANT PIPING LENGTH EVACUATION PROCEDURES(AIR PURGE) OB207t-1qxp 25/9/97 8:53 PM Page 28 (1) GUARANTEED VOLTAGE (2) AIR FLOW (3) MAIN READINGS } } PERFORMANCE CURVES Wet-and dry-bulb thermometers Wet-and dry-bulb thermometers MUH-07NV - OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation MUH-12NV - MUH-09NV - HEAT operation MUH-09NV - Wet bulb temperature 6,12,14.5C MUH-07NV - MICROPROCESSOR CONTROL 8 MSH-18NV - MSH-24NV - MSH-18NV - INDOOR UNIT DISPLAYSECTION 8-1. I FEEL CONTROL ( ) OPERATION NOTE : Coil frost prevention during COOL mode of I FEEL CONTROL COOL mode of I FEEL CONTROL HEAT mode of I FEELCONTROL 2. High pressure protection Page 8-2. COOL ( ) OPERATION 8-3. DRY( ) OPERATION 8-4. HEAT ( ) OPERATION 8-6. AUTO VANE OPERATION Page 8-8. TIMER OPERATION PROGRAM TIMER 8-9. EMERGENCY-TEST OPERATION Emergency operation switch 9SERVICE FUNCTIONS 1. COMPULSORYDEFROSTING MODE FOR SERVICE 2. DEFROST TERMINATION CHANGE 4. P.C. BOARD MODIFICATION FOR INDIVIDUALOPERATION 3. TIMER SHORT MODE Table.1 MSH-07NV - MSH-09NV - MSH-12NV - MSH-24NV - 10 TROUBLESHOOTING 10-1 Cautions on troubleshooting MSH-18NV - MSH-24NV - MSH-07NV - MSH-09NV - MSH-12NV - MSH-18NV - AABB 10-2 Instruction of troubleshooting ( OB207t-2qxp 25/9/97 8:55 PM Page 49 2 8 7 6 5 10-2-2 Trouble criterion of main parts Check of indoor fan motor A B Check of receiver P.C. board {} Check of indoor electronic control P.C. board C Check of outdoor unit D Compressor and outdoor fan do not operate.(Only indoor fan operates.) MSH-07NV MSH-09NV MSH-12NV MSH-18NV How to check mis-wiring and serial signal error (when outdoor unit does not work) MSH-24NV E } } Outdoor deicer P.C. board } } + -- DEICER P.C. BOARD -- +-- + } TEST POINT DIAGRAM AND VOLTAGE MSH-24NV - MSH-18NV - } + } Outdoor deicer P.C. board } DEICER P.C. BOARD 11 DISASSEMBLY INSTRUCTIONS 2. Removing the electronic control P.C. board and the display P.C. board. 1. Removing the front panel 11-1 MSH-07NV - MSH-09NV - MSH-12NV - NOTE: 3. Removing the electrical box Photo 3 4. Removing the vane motor 5. Removing the line flow fan and the indoor fan motor 1. Removing the front panel 11-2 MSH-18NV - MSH-24NV - MSH-18NV - MSH-24NV - 3. Removing the electrical box 4. Removing the indoor fan motor and the line flow fan Photo 3 11-3 MUH-07NV - MUH-09NV - MUH-07NV - MUH-09NV - Page 1. Removing the cabinet 2. Removing the deicer P.C. board Photo 3 11-4 MUH-12NV - MUH-18NV - MUH-12NV - MUH-18NV - 3. Removing the outdoor fan motor 4. Removing the compressor 11-5 MUH-24NV- MUH-24NV- Photo 6 12 PARTS LIST Optional parts HEAT EXCHANGER ELECTRICAL PARTS 5 11 13 MUH-09NV - - FUNCTIONAL PARTS AND ELECTRICALPARTS MUH-09NV - 14 7 17 18 11 MUH-12NV - MUH-12NV - Optional parts 23 HEAT EXCHANGER PARTS ELECTRICAL PARTS OB207t-3qxp 25/9/97 9:09 PM Page 76 17 20 19 OB207t-3qxp 25/9/97 9:10 PM Page 77 8410 22 14 Page MUH-24NV- MUH-24NV- E02 139 426 E02 141 083 2 REMOTE CONTROLLER REMOTE CONTROLLER HOLDER Symbol in Wiring Diagram 13 OPTIONAL PARTS 2. AIR CLEANING FILTER 3. DEODORIZING FILTER 1. REFRIGERANT PIPES

Mitsubishi Electronics service manual }

Models: MSH-07NV MSH-09NV MSH-12NV MSH-18NV MSH-24NV

TEST POINT DIAGRAM AND VOLTAGE

MSH-24NV - MSH-18NV -