Table of Contents
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SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Wireless type
Models
MS-18NN -
MS-24NN -
· MU-18NN -
( WH )
S1
· MU-24NN -
( WH )
S1
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················3
3. SPECIFICATION·················································5
4. OUTLINES AND DIMENSIONS ·························7
5. WIRING DIAGRAM ············································8
6. REFRIGERANT SYSTEM DIAGRAM ··············10
7. PERFORMANCE CURVES ······························13
8. MICROPROCESSOR CONTROL ····················15
9. SERVICE FUNCTIONS ····································23
10. TROUBLESHOOTING······································24
11. DISASSEMBLY INSTRUCTIONS·····················30
12. PARTS LIST······················································34
13. OPTIONAL PARTS···········································38
No. OB188
S1
S1
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Table of Contents
Related Manuals for Mitsubishi Electric MS-18NN Series
Summary of Contents for Mitsubishi Electric MS-18NN Series
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Page 1: Table Of Contents
SPLIT-TYPE, AIR CONDITIONERS No. OB188 SERVICE MANUAL Wireless type Models MS-18NN - · MU-18NN - ( WH ) MS-24NN - · MU-24NN - ( WH ) CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················3 3. SPECIFICATION·················································5 4. OUTLINES AND DIMENSIONS ·························7 5. -
Page 2: Technical Changes
TECHNICAL CHANGES MS-18JN- MS-18NN- 1. Indoor unit model and outdoor unit model have changed. 2. Indoor fan motor has changed. (S4N-24B-EA RA4N30-AA) 3. Outdoor fan motor has changed. (S6M-50F-CB RA6V50-OD) 4. Compressor has changed. (NHJ-36NBD NH-28NCDT) 5. The remote controller has changed. 6. -
Page 3: Part Names And Functions
PART NAMES AND FUNCTIONS INDOOR UNIT MS-18NN- , MS-24NN- OUTDOOR UNIT MU-18NN- , MU-24NN-... - Page 4 REMOTE CONTROLLER MS-18NN- , MS-24NN-...
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Page 5: Specification
SPECIFICATION Model MS-18NN- Function Cooling Power supply Single phase 220V 60Hz SSA 385/386* 4,200 Capacities kcal/h 3,600 Electrical Current 10.7 data Input 2,300 Capacity Capacities Dehumidification Air flow Current Input 1,910 Power factor Electrical data Starting current Compressor motor current 8.15 Fan motor current 0.75... - Page 6 Model MS-24NN- Function Cooling Power supply Single phase 220V 60Hz SSA 385/386* 5,500 Capacities kcal/h 4,700 Electrical Current 16.1 data Input 3,500 Capacity Capacities Dehumidification Air flow Current 13.5 Input 2,930 Power factor Electrical data Starting current Compressor motor current 12.58 Fan motor current 0.92...
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Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS INDOOR UNIT MS-18NN- 4holes MS-24NN- 11 20 Indoor unit Installation plate Wall hole [75 1015 Installation plate Liquid line [8-0.5m Gas line [12-0.43m Air in Installation [50 O.D [28 I.D Drain hose [16 Air out Insulation [28 17.5 Power supply cord Lead to right 2m... -
Page 8: Wiring Diagram
WIRING DIAGRAM INDOOR UNIT MS-18NN- MODEL MS-18NN - WIRING DIAGRAM RT12 HIC1 IC141 TO OUTDOOR UNIT CONNECTING CN201 CN211 TRANS RT11 ELECTRONIC CONTROL P.C BOARD POWER SUPPLY CORD 1[220V RECEIVER DISPLAY 60Hz P.C.BOARD P.C.BOARD GRN/YLW REMOTE CONTROLLER MS-24NN- MODEL MS-24NN - WIRING DIAGRAM RT12 HIC1... -
Page 9: Outdoor Unit
OUTDOOR UNIT MU-18NN- MODEL MU-18NN - WIRING DIAGRAM GRN/YLW TO INDOOR UNIT CONNECTING SYMBOL NAME SYMBOL NAME COMPRESSOR FAN MOTOR CAPACITOR (INNER THERMOSTAT) FAN MOTOR TERMINAL BLOCK CAPACITOR COMPRESSOR (INNER THERMOSTAT) MU-24NN- MODEL MU-24NN - WIRING DIAGRAM TO INDOOR UNIT CONNECTING GRN/YLW SYMBOL... -
Page 10: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Umit:mm MS-18NN - MU-18NN - INDOOR UNIT OUTDOOR UNIT Refrigerant pipe (Option) [15.88 Stop valve (with heat insulator) (With service port) Indoor coil ACCUMULATOR thermistor Outdoor Indoor heat RT12 heat exchanger exchanger Flared connector Compressor RT11 Room Flared temperature DISCHARGE... - Page 11 MAX. REFRIGERANT PIPING LENGTH Additional piping Piping size O.D : mm Length of connecting pipe : m Model Max. length : m Liquid Indoor unit Outdoor unit MS-18NN - [6.35 [15.88 0.43 MS-24NN - [9.52 MAX. HEIGHT DIFFERENCE ADDITIONAL REFRIGERANT CHARGE(R-22 : g) Model Outdoor unit precharged Refrigerant piping length (one way)
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Page 12: Evacuation Procedures
EVACUATION PROCEDURES Connect the refrigerant pipes (both the liquid and gas pipes) between the indoor and the outdoor units. Remove the service port cap of the stop valve on the side of the outdoor unit gas pipe (The stop valve will not work in it initial state fresh out of the factory (totally closed with cap on).) Connect the gage manifold valve and the vacuum pump to the service port of the stop valve on the gas pipe side of the... -
Page 13: Performance Curves
PERFORMANCE CURVES MS-18NN- MS-24NN- The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions. Since operating conditions vary according to the areas where these units are installed. The following information has been pro- vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve. - Page 14 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Both indoor and outdoor unit are under the same temperature/humidity condition. Relative humidity(%) Dry-bulb temperature(;) Air flow should be set at MAX. MU-18NN - MU-24NN - Ambient temperature(˚C) Ambient temperature(˚C) Ambient humidity(%) Ambient humidity(%) MU-18NN - MU-24NN -...
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Page 15: Microprocessor Control
MICROPROCESSOR CONTROL MS-18NN - Wireless remote controller MS-24NN - Once the controls are set, the same operation mode can be repeated by simply turning the OPERATE/STOP button ON. Indoor unit receives the signal with a beep tone. When the system turns off, 3-minute time delay will operate to protect system from overload and compressor will not restart for 3 minutes. - Page 16 (4) The initial set temperature is decided by the initial room temperature. Model Initial room temperature Initial set temperature 26°C or more 24°C COOL mode of "I FEEL CONTROL" Initial room temperature 26°C or less minus 2°C DRY mode of Initial room temperature 13°C to 25°C "I FELL CONTROL"...
- Page 17 — COOL mode of “I FEEL CONTROL” — Compressor and outdoor fan motor Run continuously in cooling mode Indoor fan motor NOTE : Coil frost prevention during COOL mode of “I FEEL CONTROL” There are two types of controls in coil frost prevention. Temperature control When the indoor coil thermistor RT12 reads -1°C or below, the coil frost prevention mode starts immediately.
- Page 18 Operation time chart Example 1st ON Thermostat Indoor fan Outdoor fan compressor 4 min. 1 min. 3 min. 8 min. NOTE Coil frost prevention during DRY mode of “I FEEL CONTROL” The operation is same as coil frost prevention during COOL mode of “I FEEL CONTROL” excepting the indoor fan is OFF.
- Page 19 4.FAN OPERATION (1)Press OPERATE/STOP button. (2)Select FAN mode. (3)Select the desired fan speed.When AUTO,it becomes LO.(Only DRY operation) Only indoor fan operates.Outdoor unit does not operate. 5. 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.
- Page 20 (3) Positioning The vane is once pressed to the vane stopper below to confirm the standard position and then set to the desired angle. The positioning is decided as follows. (a) When the operate button is pushed. (POWER ON) (b) When th stop button is pushed. (POWER OFF) (c) When the vane control change AUTO to MANUAL.
- Page 21 8. TIMER OPERATION 1. How to set the timer. (1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner. (2) Check that the current time is set correctly. NOTE : Timer operation will not work without setting the current time. Initially “AM0:00” blinks at the current time display of TIME MONITOR so set the current time, correctly with CLOCK SET button.
- Page 22 9. EMERGENCY-TEST OPERATION When the remote controller is missing, has failed or the batteries run down, press the Emergency operation switch button on the front of the indoor unit. The unit will start and the Operation lamp will light. The first 30 minutes of operation will be the test run operation. This operation is for servicing. The indoor fan runs at high speed and the system is in continuous operation.
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Page 23: Service Functions
SERVICE FUNCTIONS 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. 3-minute time delay : 3-minute 3-second. AUTO START : 1 hour 1-minute Short the connector during the timer mode. -
Page 24: Troubleshooting
TROUBLESHOOTING MS-18NN - MS-24NN - 10-1 Cautions on troubleshooting 10-1-1 Before troubleshooting, check the followings: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for mis-wiring. 10-1-2 Take care the followings during servicing. 1) Be sure to unplug the power cord before removing the front panel, the cabinet, the top panel, and the P.C. boards. 2) When removing the P.C. - Page 25 10-2 Instruction of troubleshooting Start Indoor unit Indoor unit doesn’t Indoor unit oper- Indoor unit operation dosen’t receive ates. Outdoor unit receive the signal from monitor lamp is flashing the signal from remote controller. doesn’t operate. remote Also, operation monitor controller.
- Page 26 MS-18NN- , MS-24NN- 10-2-2 Trouble criterion of main parts Part name Check method and criterion Figure Room Measure the resistance with a tester. temperature (Part temperature 10°C ~ 30°C) thermistor Normal Abnormal Indoor coil Opened or short-circuited 8kΩ ~ 20kΩ thermistor Measure the resistance between the terminals with a tester.
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Page 27: Check Of Indoor Fan Motor
Check of indoor fan motor Turn OFF power supply. Inodoor fan does not operate. Check connector CN211 visually. Are lead wires connected? Is soldered point normal? Reconnect lead wires Resolder it. Disconnect lead wires from connector CN211 on indoor control P.C. board. Measure resistance between lead wires No.1 and No.4 and then No.3 and No.4. -
Page 28: Check Of Indoor Electronic Control P.c. Board
Check of indoor electronic control P.C. board The unit doesn’t operate with the remote controller. Replace fuse. Also, the operation indicator Trouble of indoor electronic con- doesn’t light up by pressing the trol P.C. board. emergency ON/OFF switch. Is fuse(F11)blown? 1.Pull out power supply Is there resistance? cord. - Page 29 TEST POINT DIAGRAM AND VOLTAGE MS-18NN - MS-24NN - Indoor electronic control P.C. board Fan motor power supply Fuse AC250V 3.15A Power supply input AC220V DC5V Indoor coil thermistor (RT12) Room temperaure thermistor (RT11) Time short mode point Emergency switch Room temperature thermistor (RT11) Indoor coil thermistor (RT12) DC12V...
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Page 30: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS NOTE: On the wiring diagram shows the terminals with a lock mechanism, so it cannot be removed when you pull the lead wire. Be sure to pull the wire by pushing the locking lever (projected part) of the terminal with a finger. 11-1 MS-18NN - , MS-24NN - INDOOR UNIT... - Page 31 OPERATING PROCEDURE PHOTOS 3. Removing the indoor fan motor and the line flow fan Photo 3 (1) Remove the front panel. Heat exchanger (2) Remove the electrical box. (3) Unhook the catch on the both sides of the nozzle assem- bly.
- Page 32 11-2 MU-18NN - ,MU-24NN - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet (1) Remove the screws of the cabinet. (2) Hold the bottom of the cabinet on the both side to remove the cabinet. Photo 1 Photo 2 Screws Service panel...
- Page 33 OPERATING PROCEDURE PHOTOS Hook 3. Removing the outdoor fan motor Connector Photo 4 (1) Remove the cabinet. (Refer to 1) (2) Unconnect the connector remove the hooked lead wire from the fan motor. (3) Remove the propeller nut and remove the propeller. (4) Remove screws fixing the fan motor.
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Page 34: Parts List
PARTS LIST INDOOR UNIT STRUCTURAL PARTS MS-18NN - (WH) MS-24NN - (WH) OPTIONAL PARTS (See page 37) Part number that are circled is not shown in the illustration. Symbol Q'ty/unit Part No. Part Name in Wiring Remarks MS-18NN- MS-24NN- (WH) (WH) Diagram E02 138 000 FRONT PANEL... - Page 35 INDOOR UNIT ELECTRICAL PARTS MS-18NN - (WH) MS-24NN - (WH) Part number that are circled is not shown in the illustration. Symbol Q'ty/unit Part No. Part Name in Wiring MS-18NN- MS-24NN- Remarks Diagram (WH) (WH) E02 143 235 NOZZLE E02 143 040 VANE E02 141 702 DRAIN HOSE E02 172 300 INDOOR FAN MOTOR RA4N30 -...
- Page 36 INDOOR UNIT STRUCTURAL PARTS MU-18NN - MU-24NN - Part number that are circled is not shown in the illustration. Symbol Q'ty/unit Part No. Part Name in Wiring Remarks MU-18NN- MU-24NN- Diagram E02 141 232 CABINET E02 141 521 GRILLE E02 141 245 SERVICE PANEL E02 138 630 OUTDOOR HEAT EXCHANGER E02 147 630 OUTDOOR HEAT EXCHANGER E02 138 515 MOTOR SUPPORT...
- Page 37 INDOOR UNIT HEAT EXCHANGER PARTS MS-18NN - (WH) MS-24NN - (WH) Symbol Q'ty/unit Part No. Part Name in Wiring MS-18NN- MS-24NN- Remarks Diagram (WH) (WH) 1 E02 141 620 INDOOR HEAT EXCHANGER E02 138 667 UNION (LIQUID) [6.35 E02 176 667 UNION (LIQUID) [9.52 3 E02 138 666 UNION (GAS) [15.88...
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Page 38: Optional Parts
OPTIONAL PARTS 1. REFRIGERANT PIPES The air conditioner has flared connections its indoor and outdoor sides. Please use the optional extension pipe as follows. Pipe size O.D mm (in.) Additional refrigerant Model Part No. Pipe length Insulation Cross-... - Page 40 HEAD OFFICE MITSUBISHI DENKI BLDG.MARUNOUCHI TOKYO100 TELEX J24532 CABLE MELCO TOKYO Issued in Mar. 1997. MEE No. OB188 342 Printed in Japan...
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