Mitsubishi MS09NW Service Manual
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Mitsubishi MS09NW Service Manual

Split-type air conditioners
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SPLIT-TYPE AIR CONDITIONERS

SERVICE MANUAL

Wireless type
Models
MS12NN
MS15NN
MS17NN
INDOOR UNIT
MU12NN
MU15NN
MU17NN
OUTDOOR UNIT
Refer to our Service Manual OB202 when the indoor unit is used in the multi-system operation.
Applied models are MS09NW and MS15NN.
MS09NW
(WH)
MS12NN
(WH)
MS15NN
(WH)
MS17NN
(WH)
Remote
controller
·
MU09NW
·
MU12NN
·
MU15NN
·
MU17NN
CONTENTS
1. FEATURES ·························································3
2. TECHNICAL CHANGES ····································4
3. PART NAMES AND FUNCTIONS······················4
4. SPECIFICATIONS ··············································6
5. DATA···································································9
6. OUTLINES AND DIMENSIONS ·······················17
7. WIRING DIAGRAM ··········································19
8. REFRIGERANT SYSTEM DIAGRAM ··············21
9. MICROPROCESSOR CONTROL ····················22
10. SERVICE FUNCTIONS·····································30
11. TROUBLESHOOTING ······································31
12. DISASSEMBLY INSTRUCTIONS·····················39
13. PARTS LIST······················································47
14. OPTIONAL PARTS···········································55
The Slim Line.
From Mitsubishi Electric.
R
No. OB192

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Summary of Contents for Mitsubishi MS09NW

  • Page 1: Table Of Contents

    12. DISASSEMBLY INSTRUCTIONS·····················39 13. PARTS LIST······················································47 14. OPTIONAL PARTS···········································55 The Slim Line. From Mitsubishi Electric. MU12NN MU15NN MU17NN OUTDOOR UNIT Refer to our Service Manual OB202 when the indoor unit is used in the multi-system operation. Applied models are MS09NW and MS15NN.

  • Page 3: Features

    It has a liquid crystal display which indicates such infomation as mode, fan speed and temperature selected as well as the programmed ON/OFF time. It is also equipped with “I Feel Control”, a unique Mitsubishi Electric feature that allows the user to adjust the temperature to exactly the level he or she wants simply by tapping the button that describes present conditions : “Too Cool”...

  • Page 4: Technical Changes

    (Capillary tube, refrigerant and pipe had changed.) 3. Remote controller has changed. (The timer function was changed to the clock timer function.) 4. The swing mode was addedd to indoor auto vane. MS17NN 1. New Model PART NAMES AND FUNCTIONS MS09NW, MS12NN, MS15NN, MS17NN REMOTE CONTROLLER...
  • Page 5 INDOOR UNIT MS09NW MS12NN MS15NN MS17NN Operation section (When the front panel is opened) MS09NW MS09NW Emergency operation switch MS12NN, MS15NN, MS17NN MS12NN, MS15NN, MS17NN MS12NN Emergency operation switch OUTDOOR UNIT MU09NW MU12NN MU15NN MU17NN...

  • Page 6: Specifications

    SPECIFICATIONS When MS09NW indoor unit is operating with MUM18NW and MUM30NN outdoor unit connected. (Please refer to the manual No.OB202 for MUM18NW and MUM30NN.) ITEM MODELS MS09NW MS12NN Cooling capacity Btu/h 8,500 12,300/12,600 Power consumption 1,100/1,130 EER [SEER] 10.1 (10.2) 11.2/11.2 (11.3/11.3)
  • Page 7 When MS15NN indoor unit is operating with MUM30NN outdoor unit connected. (Please refer to the manual No.OB202 for MUM30NN.) ITEM MODELS MS15NN MS17NN Cooling capacity Btu/h 14,300/14,600 15,900/16,100 Power consumption 1,370/1,400 1,570/1,600 EER [SEER] 10.4/10.4 (10.5/10.5) 10.1/10.1 (10.2/10.2) INDOOR UNIT MODEL MS15NN MS17NN External finish...
  • Page 8 MAX. REFRIGERANT PIPING LENGTH Additional piping Piping size O.D. : in. Length of connecting pipe : in. Models Max. length : ft Liquid Indoor unit Outdoor unit [ 3/8 MS09NW [ 1/4 16-15/16 MS12NN [ 5/8 MS15NN MS17NN MAX. HEIGHT DIFFERENCE...

  • Page 9: Data

    DATA MS09NW, MS12NN, MS15NN, MS17NN 1. PERFORMANCE DATA 1) COOLING CAPACITY Outdoor intake air DB temperature ( ˚F ) Indoor air Models ( ˚F ) 10.4 0.75 0.82 0.88 0.93 0.97 MS09NW 0.71 0.78 0.84 0.89 0.93 0.67 0.74 0.80 0.86...

  • Page 10: Performance Curve

    2. PERFORMANCE CURVE NOTE : A point on the curve shows the reference point. MS09NW MS12NN MU09NW MU12NN Cooling capacity Cooling capacity SHF at rating condition = 0.7 SHF at rating condition = 0.71 Airflow = 279CFM Airflow = 392CFM Bypass Factor = 0.26...
  • Page 11 3. CONDENSING PRESSURE AND SUCTION PRESSURE Data is based on the condition of indoor humidity 50%. Air flow should be set at Hi. A point on the curve shows the reference point MU09NW (PSIG) 86 F 68 70 104 F Outdoor ambient temperature MU09NW (PSIG)
  • Page 12 Data is based on the condition of indoor humidity 50%. Air flow should be set at Hi. A point on the curve shows the reference point MU12NN (PSIG) 86 F 68 70 104 F Outdoor ambient temperature MU12NN (PSIG) 86 F 68 70 104 F Outdoor ambient temperature...
  • Page 13 Data is based on the condition of indoor humidity 50%. Air flow should be set at Hi. A point on the curve shows the reference point MU15NN (PSIG) 86 F 68 70 104 F Outdoor ambient temperature MU15NN (PSIG) 86 F 68 70 104 F Outdoor ambient temperature...
  • Page 14 Data is based on the condition of indoor humidity 50%. Air flow should be set at Hi. A point on the curve shows the reference point MU17NN (PSIG) 86 F 68 70 104 F Outdoor ambient temperature MU17NN (PSIG) 86 F 104 F (20) Outdoor ambient temperature...
  • Page 15 4. STANDARD OPERATION DATA Model MS09NW MS12NN MS15NN MS17NN Item Unit Cooling Cooling Cooling Cooling Capacity Btu / h 8,500 12,300/12,600 14,300/14,600 15,900/16,100 Total — 0.71 0.65 0.65 Input 0.84 1.10/1.13 1.37/1.40 1.57/1.60 INDOOR UNIT MODEL MS09NW MS12NN MS15NN MS17NN...
  • Page 16 5. OPERATING RANGE (1) POWER SUPPLY Models Rating Guaranteed Voltage MS09NW Indoor unit MS12NN Min. 103V — Max. 127V MS15NN 115V 60Hz 1[ MS17NN MU09NW Outdoor unit MU12NN Min. 198V 208V 230V Max. 253V 208/230V 60Hz 1[ MU15NN MU17NN (2) OPERATION...

  • Page 17: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit : inch MS09NW 8-7/8 8-7/8 3-5/16 5-1/4 INDOOR UNIT 30-13/16 3-11/16 12-11/16 3-5/16 12-3/8 2-9/16 7-3/16 3/16 32-1/16 1/4-19-11/16 3/8-16-15/16 1-3/8 O.D. 3/4 I.D 2-3/8 24-5/8 5-1/8 2-13/16 1-1/8 3-9/16 11/16 2-3/16 MU09NW OUTDOOR UNIT 4-3/8 o 13/16...
  • Page 18 MS12NN, MS15NN, MS17NN Unit : inch INDOOR UNIT 7/16 o 13/16 5-15/16 8-9/16 25-1/2 17-11/16 17-11/16 13-7/8 17-1/4 7-1/2 3/16 2-15/16 39-15/16 5/16-19-11/16 1/2-16-15/16 1-15/16 O.D. 1-1/8 O.D. 7-1/2 1-15/16 30-1/2 11/16 2-3/16 1-1/8 MU12NN, MU15NN, MU17NN OUTDOOR UNIT 13/16 13-12/16 1-15/16 1-3/16...

  • Page 19: Wiring Diagram

    WIRING DIAGRAM MS09NW MODEL WIRING DIAGRAM INDOOR UNIT CN202 SR11 TO OUTDOOR RT12 UNIT HIC1 CONNECTING RT11 WIRES DC12V CN201 NR11 POWER SUPPLY 115V TRANS 1 phase 60Hz TAB12 LD101 CN211 ELECTRONIC CONTROL P.C BOARD GROUND POWER MONITOR, RECEIVER P.C.BOARD...
  • Page 20 MS12NN, MS15NN, MS17NN MODELS WIRING DIAGRAM INDOOR UNIT 2 TB TO OUTDOOR CN201 RT12 UNIT CONNECTING RT11 HIC1 WIRES DC12V LDCOM TAB12 POWER LDC11 SUPPLY NR11 LDC12 115V LDFH 1 phase SR144 TRANS 60Hz LDFL SR142 LDFM SR143 CN202 GRN/YLW GRN/YLW GROUND RECEIVER...

  • Page 21: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM Unit:inch MS09NW / MU09NW INDOOR UNIT OUTDOOR UNIT Refrigerant pipe (option) (with heat insulator) Stop valve with service port Fusible plug Indoor heat Outdoor heat Indoor coil Flared Service Service exchanger thermistor exchanger connection port port RT12...

  • Page 22: Microprocessor Control

    MICROPROCESSOR CONTROL Wireless remote controller MS09NW, MS12NN, MS15NN, MS17NN 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 turned off, 3-minute time delay will operate to protect system from overload and compressor will not restart for 3 minutes.
  • Page 23 (4) The initial set temperature is decided by the initial room temperature. Initial set temperature Initial room temperature Model 75˚F 79: or more COOL mode of “I FEEL CONTROL” Initial room temperature 79˚F or more minus 4˚F Initial room temperature DRY mode of 55˚F to 77 ˚F minus 4˚F...
  • Page 24 1 1 Temperature control <MS09NW> When the indoor coil thermistor RT12 reads 39°F or below for 5 minutes, the coil frost prevention mode starts. <MS12/15/17NN> When the indoor coil thermistor RT12 reads 30°F or below, the coil frost prevention mode starts immediately.
  • Page 25 Operation time chart Example 1st ON Thermostat Indoor fan Outdoor fan compressor 1 min. 3 min. 8 min. NOTE Coil frost prevention during DRY mode of “I FEEL CONTROL” The operation is as same as coil frost prevention during COOL mode of “I FEEL CONTROL” excepting the indoor fan is OFF.
  • Page 26 (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 (MS09NW only) (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 27 (3) Positioning The vane will once swings to the vane stopper as below to confirm the standard position and then set to the desired angle. The positioning is decided as follows. (a) When the OPERATE/STOP button is pressed. (POWER ON/OFF) (b) When the vane control change AUTO to MANUAL.
  • Page 28 7. TIMER OPERATION 1. How to set the timer. (1) Press OPERATE/STOP 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 TIMER MONITOR so set the current time, correctly with CLOCKSETTING button.
  • Page 29 The coil frost prevention circuit operates in this mode. In the test run or Emergency operation, auto vane operates in AUTO mode with the set temperature 75°F. NOTE : Do not press the EMERGENCY OPERATION switch during normal operation. MS09NW Press once <Cool>...

  • Page 30: Service Functions

    SERVICE FUNCTIONS MS09NW, MS12NN, MS15NN, MS17NN 1. AUTO RESTART FUNCTION When the indoor unit is operated with the remote controller, the signals of the operation mode, the set temperature, and the fan speed are sent from the indoor electronic control P.C.board and memorized in the auto restart assembly.

  • Page 31: Troubleshooting

    TROUBLESHOOTING MS09NW, MS12NN, MS15NN, MS17NN 11-1 Cautions on troubleshooting 11-1-1 Before troubleshooting, check the followings: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for mis-wiring. 11-1-2 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.
  • Page 32 Outdoor unit Refer to switch is pressed. Outdoor unit fan does not does not ”Check of operates in MS09NW only rotate,with operate even receiver P.C. only Test 3-time flash Operation indi- in Test Run board” on Run mode.
  • Page 33 MS09NW, MS12NN, MS15NN, MS17NN 11-2-2 Trouble criterion of main parts Part name Check method and criterion Figure Room Measure the resistance with a tester. temperature (Part temperature 50°F ~ 86°F) thermistor Normal Abnormal Indoor coil 8kΩ ~ 20kΩ Opened or short-circuited thermistor Measure the resistance between the terminals with a tester.

  • Page 34: Check Of Indoor Fan Motor

    Check of indoor fan motor Turn OFF power supply. Inodoor fan does not operate. Check connector (Fan motor) visually. Are lead wires connected? Is soldered point nomal? Reconnect lead wires Resolder it. Disconnect lead wires from connector (Fan motor) on indoor electronic control P.C. board. Measure resistance between lead wires No.1 and No.3 and then No.2 and No.3 (09NW) No.1 and No.4 and then No.3 and No.4 (12/15/17NN)
  • Page 35 Re-install the unit away from lights. inverter or rapid-start type within Attach a filter on receiving part. the range of 3.28ft? MS12/15/17NN MS09NW The connector connecting Connect properly. Receiver P.C. board and Micom P.C. board is properly fixed. Replace Receiver P.C. board.

  • Page 36: Check Of Indoor Electronic Control P.c. Board

    Start Press Emergency operation switch. 3-minute time delay works. Test mode operates for 30 minutes. Check resistance to terminal block of outdoor unit. Is there 115V(MS09NW), 208/230V(MS12/15/17NN) to terminal block between (MS09NW), (MS12/15/17NN)? Check the indoor, outdoor connection and respective power supply.
  • Page 37 TEST POINT DIAGRAM AND VOLTAGE MS09NW Indoor electronic control P.C. board TAB 12 Power supply input AC115V CN201 No.1 Varistor(NR11) Fuse AC250V 3.0A Room temperature thermistor (RT11) Indoor coil thermistor (RT12) Timer short mode point Room temperature thermistor (RT11) Indoor coil thermistor (RT12)
  • Page 38 TEST POINT DIAGRAM AND VOLTAGE MS12NN, MS15NN, MS17NN Indoor electronic control P.C. board Fan motor power supply Me Lo 8 7 5 6 4 Varistor(NR11) Fuse AC250V 3.0A CN201 Power supply input AC115V DC12V JP11 DC5V JP24 Time short mode point Indoor coil thermistor (RT12) CN112 CN111...

  • Page 39: Disassembly Instructions

    Be sure to pull the wire by pushing the locking lever (projected part) of the terminal with a finger. 1 1 Slide the sleeve. 2 2 Pull the wire while pushing the locking lever. 12-1 MS09NW INDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the front panel (1) Remove the screws caps of the front panel.
  • Page 40 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box (1) Remove the front panel. (Refer to 1) (2) Remove the electrical cover. (3) Disconnect the connector of the indoor coil thermistor. (4) Disconnect the motor connector (CN211) and the vane motor connector (CN151) on the electronic control P.C. board.
  • Page 41 12-2 MS12NN, MS15NN, MS17NN INDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the front panel Photo 1 (1) Remove the screw caps at the bottom of the front panel. Remove the screws. Front panel (2) Pull the down of the front panel to your side slightly and unhook the catches at the top of the front panel.
  • Page 42 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- Catch bly.
  • Page 43 12-3 MU09NW OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove screws securing the top panel. (2) Remove the screw securing the service panel. (3) Remove screws securing the cabinet. (4) Remove the service panel,and remove the screw from the Screw for insides.
  • Page 44 OPERATING PROCEDURE PHOTOS 3. Removing the compressor Photo 4 (1) Remove the lead clamps. (2) Remove the screws fixing the relay panel. (3) Remove the screw fixing the service port. Terminal cover Discharege pipe (4) Remove the terminal cover. (5) Pull out the lead from the compressor terminal. (6) Remove the overcurrent relay.
  • Page 45 12-4 MU12NN, MU15NN, MU17NN OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the cabinet. (2) Hold the bottom of the cabinet on the both side to remove the cabinet. Screws Service panel Photo 2 Screws 2.
  • Page 46 OPERATING PROCEDURE PHOTOS Clamp 3. Removing the outdoor fan motor Photo 4 Connector (1) Remove the cabinet. (Refer to 1) (2) Disconnect the connector and remove the clamp of fan motor lead wire. (3) Remove the propeller nut and remove the propeller fan. (4) Remove screws securing the fan motor.

  • Page 47: Parts List

    PARTS LIST INDOOR UNIT STRUCTURAL PARTS MS09NW (WH) OPTIONAL PARTS (See page 55) Q'ty / set Symbol in Remarks Parts No. Parts Name MS09NW Wiring Diagram (Drawing No.) (WH) E02 268 000 FRONT PANEL(WH) E02 151 010 GRILLE(WH) E02 164 100...
  • Page 48 INDOOR UNIT ELECTRICAL PARTS MS09NW (WH) Part numbers that are circled are not shown in the illustration. Q'ty / set Symbol in Remarks Parts No. Parts Name MS09NW Wiring Diagram (Drawing No.) (WH) E02 199 520 NOZZLE(WH) FAN GUARD E02 166 040...
  • Page 49 OUTDOOR UNIT STRUCTURAL PARTS MU09NW Part numbers that are circled are not shown in the illustration. Q'ty / set Symbol in Remarks Parts No. Parts Name Wiring Diagram (Drawing No.) MU09NW E02 096 232 CABINET E02 085 297 TOP PANEL E02 085 521 FAN GUARD E02 085 245...
  • Page 50 OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS MU09NW Q'ty / set Symbol in Remarks Parts No. Parts Name Wiring Diagram (Drawing No.) MU09NW E02 085 501 PROPELLER FAN E02 268 301 OUTDOOR FAN MOTOR RA6W23 - E02 268 353 COMPRESSOR CAPACITOR 55µF/220VAC E02 268 351 OUTDOOR FAN CAPACITOR...
  • Page 51 INDOOR UNIT STRUCTURAL PARTS MS12NN (WH) MS15NN (WH) MS17NN (WH) OPTIONAL PARTS (See page 55) Part number that is circled is not shown in the illustration. Q'ty / set Symbol in Remarks Parts No. Parts Name Wiring Diagram (Drawing No.) 12NN(WH) 15NN(WH) 17NN(WH) E02 270 000...
  • Page 52 INDOOR UNIT ELECTRICAL PARTS MS12NN (WH) MS15NN (WH) MS17NN (WH) Part numbers that are circled are not shown in the illustration. Q'ty / set Symbol in Remarks Parts No. Parts Name Wiring Diagram (Drawing No.) 12NN(WH) 15NN(WH) 17NN(WH) E02 138 520 NOZZLE(WH) FAN GUARD E02 143 040...
  • Page 53 OUTDOOR UNIT STRUCTURAL PARTS MU12NN MU15NN MU17NN Part numbers that are circled are not shown in the illustration. Q'ty / set Remarks Symbol in Parts No. Parts Name (Drawing No.) Wiring Diagram 12NN 15NN 17NN E02 141 232 CABINET E02 141 521 GRILLE SERVICE PANEL E02 270 245...
  • Page 54 ACCESSORY AND REMOTE CONTROLLER PARTS MS09NW (WH) MS12NN (WH) MS15NN (WH) MS17NN (WH) Q'ty / set Symbol in MS09NW, MS12NN Remarks Parts No. Parts Name Wiring Diagram MS15NN, MS17NN (Drawing No.) (WH) E02 268 426 REMOTE CONTROLLER E02 141 083...

  • Page 55: Optional Parts

    Pipe length Cross-section A-Gas B-Liquid Insulation charge R-22(Oz) 10ft MAC - 440PI C 13/16 16ft MAC - 441PI D 1-1/16 MS09NW 23ft MAC - 442PI 33ft MAC - 443PI 10ft MAC - 670PI MS12NN 16ft MAC - 671PI C 1-7/32 MS15NN...
  • Page 56 C C Copyright 1997 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD. New publication, effective May 1997. Issued in May 1997 NO. OB192 5042 Specifications subject to change without notice.
  • Page 57 3400 Lawrenceville Suwanee Road Suwanee, Georgia 30024 ● Toll Free: 800-433-4822 Toll Free Fax: 800-889-9904 ● www.mrslim.com Specifications are subject to change without notice.

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