Mitsubishi Electronics MSH-24NV manuale d’uso

SER VICE MANUAL SPLIT -TYPE,HEA T PUMP AIR CONDITIONERS CONTENTS 1. TECHNICAL CHANGES ····································2 2. P ART NAMES AND FUNCTIONS ······················3 3. SPECIFICA TION·················································[...]

2 TECHNICAL CHANGES MSH-17NV - ➔ MSH-07NV - 1. Indoor electronic control P .C.board has changed. However , it is compatible between and models. 2. Auto restart function is added. MSH-09NV - ➔ MSH-09NV - 1. Indoor electronic control P .C.board has changed. However , it is compatible between and models. 2. Auto restart function is added. MSH-12NV[...]

3 P ART NAMES AND FUNCTIONS 2 INDOOR UNIT MSH-07NV - MSH-07NV - MSH-09NV - MSH-09NV - MSH-12NV - MSH-12NV - E2 E1 E2 E1 E2 E1 OUTDOOR UNIT MUH-12NV - MUH-18NV - MUH-18NV - MUH-18NV - E3 E2 E1 E1 MUH-24NV - MUH-24NV - E2 E1 MUH-07NV - MUH-09NV - MUH-07NV - MUH-09NV - E2 E2 E1 E1 (When the front panel is open) MSH-07NV - MSH-09NV - MSH-12NV - MSH-07N[...]

4 REMOTE CONTROLLER MSH-07NV - MSH-09NV - MSH-12NV - MSH-18NV - MSH-18NV - E2 E1 E1 E1 E1 OB207t-1qxp 25/9/97 8:51 PM Page 4[...]

5 MSH-07NV - (Serial number 7000201T~) MSH-09NV - (Serial number 7000201T~) MSH-12NV - (Serial number 7000001T~) MSH-24NV - MSH-07NV - MSH-09NV - MSH-12NV - MSH-18NV - (Serial number 7000001T~) MSH-24NV - MSH-18NV - E3 E2 E2 E2 E2 E2 E1 E1 E1 E1 OB207t-1qxp 25/9/97 8:51 PM Page 5[...]

6 SPECIFICA TION 3 Capacity Electrical data Compressor Indoor fan motor Outdoor fan motor Dimensions Weight Special remarks Model Function Power supply Coefficient of performance(C.O.P) Capacity Dehumidification Air flow Power outlet Running current Power input Auxiliary heater Power factor Starting current Compressor motor current Fan motor curren[...]

7 Capacity Electrical data Compressor Indoor fan motor Outdoor fan motor Dimensions Weight Special remarks Model Function Power supply Coefficient of performance(C.O.P) Capacity Dehumidification Air flow Power outlet Running current Power input Auxiliary heater Power factor Starting current Compressor motor current Fan motor current Model Output Wi[...]

8 Capacity Electrical data Compressor Indoor fan motor Outdoor fan motor Dimensions Weight Special remarks Model Function Power supply Coefficient of performance(C.O.P) Capacity Dehumidification Air flow Power outlet Running current Power input Auxiliary heater Power factor Starting current Compressor motor current Fan motor current Model Output Wi[...]

9 Capacity Electrical data Compressor Indoor fan motor Outdoor fan motor Dimensions Weight Special remarks Model Function Power supply Coefficient of performance(C.O.P) Capacity Dehumidification Air flow Power outlet Running current Power input Auxiliary heater Power factor Starting current Compressor motor current Fan motor current Model Output Wi[...]

10 Capacity Electrical data Compressor Indoor fan motor Outdoor fan motor Dimensions Weight Special remarks Model Function Power supply Coefficient of performance(C.O.P) Capacity Dehumidification Air flow Power outlet Running current Power input Auxiliary heater Power factor Starting current Compressor motor current Fan motor current Model Output W[...]

11 OUTLINES AND DIMENSIONS 4 MSH-07NV - MSH-09NV - MSH-07NV - MSH-09NV - E2 E2 E1 E1 MUH-07NV - MUH-09NV - MUH-07NV - MUH-09NV - E2 E2 E1 E1 INDOOR UNIT OUTDOOR UNIT Unit: mm OB207t-1qxp 25/9/97 8:51 PM Page 11[...]

12 MSH-12NV - MSH-12NV - E2 E1 MUH-12NV - MUH-12NV - E2 E1 INDOOR UNIT OUTDOOR UNIT 9.52 If the right/left sides or back side is vacant,the front has only to be 50cm unobstructed. If the front or right/left sides are vacant, the top has only to be 10cm unobstructed. Unit: mm OB207t-1qxp 25/9/97 8:51 PM Page 12[...]

OUTDOOR UNIT 13 MSH-18NV - MSH-24NV - MSH-18NV - MSH-24NV - MSH-18NV - E3 E2 E2 E1 E1 MUH-18NV - MUH-18NV - MUH-18NV - E3 E2 E1 INDOOR UNIT 3 3 297 297 450 450 450 450 352 352 438 438 254 254 20 20 60 60 40 40 150 150 648 648 217 217 5 5 190 190 995 995 190 190 775 775 50 50 320 320 1015 1015 17.5 17.5 160 160 56 56 4holes 1 4holes 1 1 1 ✕ ✕ 20[...]

14 MUH-24NV - MUH-24NV - Unit : mm (inch) E2 E1 100 10 1000 For 10 units or less 200 Outdoor Unit-Necessary surrounding clearance (Concentrated installation) The upper side must be open. Outdoor Unit-Necessary surrounding clearance 200 10 10 10 Note:Allow adequate upper clearance 150 500 500 Service space Front opening Handle for moving 138 95 Rear[...]

15 WIRING DIAGRAM 5 NOTE:1. For the outdoor electric wiring refer to the outdoor unit electric wiring diagram for servicing. 2. Use copper conductors only .(For field wiring) 3. Symbols below indicate. : T erminal block, : Connector MSH-07NV - MSH-09NV - E1 E1 MODELS WIRING DIAGRAM MUH-07NV - MUH-09NV - E1 E1 MODELS WIRING DIAGRAM OUTDOOR UNIT SYMB[...]

16 MSH-12NV - E1 MUH-12NV - E1 MODEL WIRING DIAGRAM MODEL WIRING DIAGRAM INDOOR UNIT OUTDOOR UNIT ❈ ❈ ❈ ❈ ❈ ❈ ~/N ~ TO OUTDOOR UNIT CONNECTING 12VDC L 3 2 N ; FOR MUL TI SYSTEM SYMBOL TB MV SR1 1 SYMBOL NR1 1 RT1 1 RT12 52C SYMBOL C1 1 F12 F1 1 MF NAME NAME NAME INDOOR F AN CAP ACITOR FUSE(93 : ) FUSE(3.15A) INDOOR F AN MOTOR V ARISTOR [...]

17 MSH-18NV - E1 MUH-18NV - E1 MODEL WIRING DIAGRAM MODEL WIRING DIAGRAM INDOOR UNIT OUTDOOR UNIT ❈ ❈ ❈ ❈ ❈ ❈ SYMBOL TB DSAR HIC1 SYMBOL NR1 1 RT1 1 RT12 IC141 52C SYMBOL C1 1 F12 F1 1 MF MV NAME NAME NAME INDOOR F AN CAP ACITOR FUSE(93 : ) FUSE(3.15A) INDOOR F AN MOTOR V ANE MOTOR V ARISTOR ROOM TEMPERA TURE THERMISTOR INDOOR COIL THER[...]

18 MSH-24NV - E1 MUH-24NV - E1 MODEL WIRING DIAGRAM MODEL WIRING DIAGRAM INDOOR UNIT OUTDOOR UNIT NF WHT BLU BLU 4 3 1 2 1 11 CN 52C CIRCUIT BREAKER RT12 IC141 1 12 CN HIC1 NR1 1 TRANS 220-240V~ WHT 220-240V~ REMOTE CONTROLLER 3 1 DISPLA Y P .C.BOARD 101 CN 102 CN 151 CN ELECTRONIC CONTROL P .C BOARD 4 2 1 C1 1 CN21 1 BLU RECEIVER P .C.BOARD BLK WH[...]

19 MSH-07NV - MSH-09NV - MSH-12NV - E2 E2 E2 MUH-07NV - MUH-09NV - E2 E2 MODELS WIRING DIAGRAM MODELS WIRING DIAGRAM INDOOR UNIT OUTDOOR UNIT CIRCUIT BREAKER GUARD PLA TE FOR MUL TI SYSTEM TO OUTDOOR UNIT CONNECTING 12VDC TB F12 MV POWER MONITOR, RECEIVER P .C.BOARD REMOTE CONTROLLER POWER SUPPL Y CORD ~/N 220-240V 50Hz TO OUTDOOR UNIT CONNECTING 1[...]

20 MUH-12NV - E2 MODEL WIRING DIAGRAM OUTDOOR UNIT 21S4 SR61 CN661 CN721 X62 MC MF 52C 4 3 WHT RED BLU BLU BLK WHT ORN RED BLK WHT RED TRANS R S C C1 RED BLK 12VDC GRN/YL W TO INDOOR UNIT CONNECTING TB 220-240V~ 2 N 2 3 4 1 4 3 2 1 RT61 CN730 F61 BLK BLK X62 C65 T AB20 NR61 CN71 1 DEICER P .C.BOARD 1 WHT IC881 3 ❈ ❈ ❈ ❈ ❈ ❈ SYMBOL X62 2[...]

21 MSH-18NV - E2 MUH-18NV - E2 MODEL WIRING DIAGRAM MODEL WIRING DIAGRAM INDOOR UNIT OUTDOOR UNIT ~/N TO OUTDOOR UNIT CONNECTING 12VDC L 3 2 N FOR MUL TI SYSTEM ; SYMBOL TB DSAR HIC1 SYMBOL NR1 1 RT1 1 RT12 IC141 52C SYMBOL C1 1 F12 F1 1 MF MV NAME NAME NAME INDOOR F AN CAP ACITOR FUSE(93 : ) FUSE(3.15A) INDOOR F AN MOTOR V ANE MOTOR V ARISTOR ROOM[...]

22 MSH-24NV - E2 MUH-24NV - E2 MODEL WIRING DIAGRAM MODEL WIRING DIAGRAM INDOOR UNIT OUTDOOR UNIT NF WHT BLU BLU 4 3 1 1 11 CN 52C CIRCUIT BREAKER RT12 IC141 1 12 CN HIC1 NR1 1 TRANS 220-240V~ WHT 220-240V~ REMOTE CONTROLLER 3 1 DISPLA Y P .C.BOARD 101 CN 102 CN 151 CN ELECTRONIC CONTROL P .C BOARD 4 2 1 C1 1 CN21 1 BLU RECEIVER P .C.BOARD BLK WHT [...]

23 MSH-18NV - E3 MUH-18NV - E3 MODEL WIRING DIAGRAM MODEL WIRING DIAGRAM INDOOR UNIT OUTDOOR UNIT CIRCUIT BREAKER N 2 12VDC L 50Hz CORD POWER SUPPL Y ~/N 220-240V F1 1 NR1 1 TRANS HIC1 12VDC 220-240V~ DSAR BRN GRN/YL W LD1 DISPLA Y P .C.BOARD RECEIVER P .C.BOARD 3 3 101 102 CN CN 1 TO OUTDOOR UNIT CONNECTING N BLU GRN/YL W MV 151 CN 5 BLU 3 BLU ELE[...]

24 REFRIGERANT SYSTEM DIAGRAM 6 MSH-07NV - MSH-07NV - E2 E1 MUH-07NV - MUH-07NV - E2 E1 INDOOR UNIT OUTDOOR UNIT Indoor heat exchanger Room temperature thermistor RT1 1 (with heat insulator) Flared connection Flared connection Refrigerant pipe [ 9.52 (Option) Muffler Reversing valve (4-way valve) Defrost thermistor RT61 Accumulator Strainer Outdoor[...]

25 Unit:mm MSH-12NV - MSH-12NV - E2 E1 MUH-12NV - MUH-12NV - E2 E1 INDOOR UNIT OUTDOOR UNIT (with heat insulator) (with heat insulator) Refrigerant pipe [ 12.7 (Optional) Reversing valve (4-way valve) Muffler Stop valve (with service port) Strainer Refrigerant pipe (Option) [ 6.35 Stop valve Capillary tube [ 1.4x500 Check valve Refrigerant flow in [...]

26 MSH-24NV - MSH-24NV - E2 E1 MUH-24NV - MUH-24NV - E2 E1 INDOOR UNIT OUTDOOR UNIT Indoor heat exchanger Room temperature thermistor RT1 1 Refrigerant pipe [ 15.88 (Option) (with heat insulator) Flared connection Flared connection Indoor coil thermistor RT12 Refrigerant pipe (Option) [ 9.52 (with heat insulator) Ball valve with Service port Strain[...]

27 Models Piping size O.D : mm Length of connecting pipe : m Refrigerant piping Max. length : m A 10 15 Indoor unit 0.43 Gas 9.52 12.7 15.88 Liquid 6.35 9.52 Outdoor unit 0 MSH-07NV - E1 MSH-09NV - E1 MSH-07NV - E2 MSH-09NV - E2 MSH-12NV - E1 MSH-12NV - E2 MSH-18NV - E1 MSH-18NV - E2 MSH-18NV - E3 MSH-24NV - E1 MSH-24NV - E2 Models Refrigerant pipi[...]

28 EV ACUA TION PROCEDURES(AIR PURGE) Pipe length : 7m maximum No gas charge is needed Pipe length exceeding 7m Charge the prescribed amount of gas T ighten the cap to the service port to obtain the initial status. Retighten the cap. Leak test After refrigerant pipes are connected and evacuated, fully open all stop valves on gas and liquid pipe sid[...]

29 7 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 condition[...]

30 0.7 0.6 0.5 0.4 0.3 7 6 5 4 3 Outdoor low pressure Ambient temperature(˚C) Ambient humidity(%) Ambient temperature(˚C) Ambient humidity(%) MUH-07NV - E2 E1 MUH-07NV - E2 E1 Outdoor unit current (A) 220V 240V 220/240V (kgf/ F •G)(MPa•G) 9.1 1 1.4 7.6 8.5 9.4 10.4 12.0 12.7 8.1 9.2 10.3 1 1.5 14.0 24 24 25.5 23.5 21.6 19.6 17.6 15.6 13.7 1 1[...]

31 0.7 0.6 0.5 0.4 0.3 7 6 5 4 3 MUH-12NV - E2 E1 MUH-12NV - E2 E1 Outdoor low pressure Ambient temperature(˚C) Ambient humidity(%) Ambient temperature(˚C) Ambient humidity(%) Outdoor unit current (A) 220V 240V 0.7 0.6 0.5 0.4 0.3 7 6 5 4 3 MUH-09NV - E2 E1 MUH-09NV - E2 E1 Outdoor low pressure 220V 240V Ambient temperature(˚C) Ambient humidity([...]

32 HEA T operation Condition indoor:Dry bulb temperature 20.0°C Wet bulb temperature 14.5°C Outdoor:Dry bulb temperature 7,15,20°C Wet bulb temperature 6,12,14.5°C MUH-18NV - E3 E2 E1 Outdoor unit current (A) Outdoor unit current (A) Outdoor unit current (A) Outdoor unit current (A) Ambient temperature(˚C) Ambient temperature(˚C) Ambient temp[...]

33 MICROPROCESSOR CONTROL 8 Once the controls are set, the same operation mode can be repeated by simply turning the OPERA TE/ST OP 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. 8-1. “I FEEL CON[...]

34 Model COOL mode of "I FEEL CONTROL" DR Y mode of "I FEEL CONTROL" HEA T mode of "I FEEL CONTROL" Initial room temperature Initial set temperature 26 : 26 : or more 26 : or less 23 : or less 23 : or 25 : 24 : Initial room temperature minus 2 : Initial room temperature minus 2 : ❈ 1 ❈ 1 After the system restarts b[...]

35 NOTE : Coil frost prevention during COOL mode of “I FEEL CONTROL” There are two types of controls in coil frost prevention. ① T emperature control <MSH-07/09/12> When the indoor coil thermistor RT12 reads 4°C or below for 5 minutes, the coil frost prevention mode starts. <MSH-18/24>When the indoor coil thermistor RT12 reads 3?[...]

36 — HEA T mode of “I FEEL CONTROL” — 1. Indoor fan speed control (1) Followings are the fan speed in AUTO. Set temperature minus room temperature: 2 degrees or more ················································· Hi Set temperature minus room temperature: 1 degree or more and less than 2 d[...]

37 NOTE 1 :When the outdoor fan is OFF in heating, defrosting of outdoor heat exchanger is not detected by the defrost thermis- tor RT61. NOTE 2 :When connected to MXZ-32NV - outdoor unit,the MSH-07/09/12NV - , MSH-07/09/12/18NV - and MSH-18NV - indoor unit sends the data for the temperature to the outdoor unit according to the indoor coil temper- [...]

38 NOTE1 ● When the indoor coil thermistor reads above 18°C, indoor fan operates at VLo for 30 seconds. ● When the indoor coil thermistor reads 18°C or less, the indoor fan stops. NOTE2: Refer to the Service Manual OB185 when MSH-07/09/12NV - , MSH-07/09/12/18NV - , and MSH-18NV - are connected with MXZ-32NV - as multi system units. E1 E3 E2 [...]

39 8-2. COOL ( ) OPERA TION (1) Press OPERA TE/ST OP button. OPERA TION INDICA TOR of the indoor unit turns on with a beep tone. (2) Select COOL mode. (3) Set the TEMPERA TURES button. (T OO W ARM or T OO COOL button) The setting range is 16 ~ 31°C ✻ Indoor fan continues to operate regardless of thermostat’s OFF-ON ✻ Coil frost prevention is[...]

40 SLEEP 8-6. AUT O V ANE OPERA TION (1) V ane motor drive MSH-N series is equipped with a stepping motor for the vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approx. 12V) transmitted from indoor microprocessor . (2) The auto vane angle changes as follows by pressing the V ANE CONTROL ( ) button. 8-5.[...]

41 (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 OPERA TE/ST OP button is pressed. (POWER ON/OFF) (b) When the vane control is changed from AUTO to MANUAL. (c) When the SWING is finished. (d) When the test run[...]

42 8-8. TIMER OPERA TION 1. How to set the timer (1) Press OPERA TE/ST OP button to start the air conditioner . (2) Check that the current time is set correctly . NOTE : T imer operation will not work without setting the current time. Initially “AM0:00” blinks at the current time display of TIME MONIT OR so set the current time, correctly with [...]

43 8-9. EMERGENCY -TEST OPERA TION When the remote controller is missing, has failed or the batteries run down, press the EMERGENCY OPERA TION switch on the front of the indoor unit. The unit will start and the OPERA TION INDICA TOR lamp will light. The first 30 minutes of operation will be the test run operation. This operation is for servicing. T[...]

44 9 SER VICE FUNCTIONS 1. COMPULSOR Y DEFROSTING MODE FOR SERVICE By short circuit of the connector JP607 and R853 on the outdoor deicer P .C. board, defrosting mode can be accomplished regardless of the defrost interval restriction. See Page 56 and 59. Defrost thermistor RT61 must read below -3°C 2. DEFROST TERMINA TION CHANGE <JPC> when t[...]

45 How to modify the remote controller P .C. board Remove batteries before modification. The board has a print as shown below : The P .C.board has the print “J1” and “J2”.Jumper wires are mounted to each “J1” and “J2”.Cut J1 and J2 according to the number of indoor unit as shown in T able 1. After modification,push the reset button.[...]

46 When the indoor unit is controlled with the remote controller , the operation mode, set temperature, and the fan speed are memorized by the indoor electronic control P .C.board. The “AUTO REST ART FUNCTION” sets to work the moment power has restored after power failure.Then, the unit will restart automatically . However if the unit is operat[...]

47 10 TROUBLESHOOTING 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 T ake care the followings during servicing. 1) Before servicing the air conditioner , be sure to first turn off the remote controller to sto[...]

48 10-2 Instruction of troubleshooting Indoor unit oper- ates. Outdoor unit doesn’t operate. Outdoor unit operates in only T est Run opera- tion. Outdoor unit doesn’t oper- ate even in T est Run operation. Check room temperature thermistor . Refer to “Check of outdoor unit” on page 52. Indoor unit dosen’t receive the signal from remote co[...]

49 10-2-1 troubleshooting check table ❈ Before taking measures, make sure that the symptom reappears, for accurate troubleshooting. Self check table NO. 1 2 3 4 Abnormal point Mis-wiring Serial sig- nal Indoor coil thermistor Room tempera- ture ther- mistor Indoor fan motor Outdoor thermistor Indication 0.5-second ON 0.5-second OFF 1-time flash 2[...]

50 Measure the resistance between the terminals with a tester . (Coil wiring temperature10°C ~ 30° C) Compressor Room temperature thermistor 10-2-2 T rouble criterion of main parts Part name Indoor coil thermistor Indoor fan motor Motor part Sensor part Outdoor fan motor V ane motor Check method and criterion Measure the resistance with a tester [...]

51 Y es Y es Check of indoor fan motor A Check of receiver P .C. board B Inodoor fan does not operate. Repair the indoor fan motor . Disconnect lead wires from connector CN21 1 on indoor electronic control P .C. board. Measure resistance between lead wires No.1 and No.4 and then No.1 and No.2(MSH-18/24) No.1 and No.3 and then No.2 and No.3(MSH-07/0[...]

52 Check both “parts side”and “pattern side” of indoor electronic control P .C. board visually . Check of indoor electronic control P .C. board C The unit doesn’t operate with the remote controller . Also, the OPERA TION INDICA- TOR lamp doesn’t light up by pressing the EMERGENCY OPERA TION switch. Be sure to check both fuse and varisto[...]

53 Y es Y es How to check mis-wiring and serial signal error (when outdoor unit does not work) E 1. T urn OFF power supply . 2. T urn ON power supply . 3. Press EMERGENCY OPERA TION switch. 3 min. later , when relay 52C turns ON, what self-check result is displayed on OPERA TION INDICA TOR lamp on indoor unit? ❈ 1 Start 1. T urn OFF power supply [...]

54 Y es Y es How to check mis-wiring and serial signal error (when outdoor unit does not work) E 1. T urn OFF power supply . 2. T urn ON power supply . 3. Press EMERGENCY OPERA TION switch. 3 min. later , what self-check result is displayed on OPERA TION INDICA TOR lamp on indoor unit? ❈ 1 Start 1. T urn OFF power supply and disconnect in-out con[...]

55 TEST POINT DIAGRAM AND VOL T AGE MSH-18NV - Indoor electric control P .C.board E1 } } } } } Fan motor power supply Fuse AC250V 3.15A Power supply input AC 220-240V + -- R132 DC 0 ~20V + -- DC5V Indoor coil thermistor(RT12) T imer short mode point Emergency operation switch DC12V + -- Room temperature thermistor(RT1 1) C144 C144 JP43 JPG OB207t-2[...]

56 MUH-18NV - Outdoor deicer P .C. board E1 } Defrost thermistor(RT61) } } } } } } } + -- Outdoor fan motor AC 220-240V Reversing valve coil AC 220-240V R601 DC5~10V INPUT AC 220-240V DEICER P .C. BOARD Fuse 2A/250V Defrost interval time short pin + J8 -- J7 DC5V Defrost termination temperature change. Jumper wire JPC and JPE 52C DC12V DC12V -- + -[...]

57 TEST POINT DIAGRAM AND VOL T AGE MSH-07NV - MSH-09NV - MSH-12NV - MSH-07NV - MSH-09NV - MSH-12NV - Indoor electronic control P .C. board E2 E2 E2 E1 E1 E1 CN201 No1 V aristor(NR1 1) Fuse AC250V 3.15A Room temperature thermistor(RT1 1) Indoor coil thermistor(RT12) T ime short mode point P .C.board DC0~20V R132 Indoor coil thermistor(RT12) Room te[...]

58 TEST POINT DIAGRAM AND VOL T AGE MSH-24NV - MSH-18NV - MSH-24NV - MSH-18NV - E3 E2 E2 E1 Fan motor power supply Fuse AC 250V 3.15A } Power supply input AC 220-240V + } DC5V Indoor coil thermistor(RT12) JPS T ime short mode point JPS Emergency operation switch + } DC12V P .C.board DC0~20V R132 Room temperature thermistor(RT1 1) C144 C144 JPG JP41[...]

59 MUH-07NV - MUH-09NV - MUH-12NV - MUH-24NV - MUH-07NV - MUH-09NV - MUH-12NV - MUH-18NV - MUH-24NV - MUH-18NV - Outdoor deicer P .C. board E3 E2 E2 E2 E2 E2 E1 E1 E1 E1 Outdoor fan motor AC 220-240V Reversing valve coil AC 220-240V R601 DC5~10V + INPUT AC 220-240V Defrost thermistor(RT61) Fuse 2A/250V Defrost interval time short pin } J9 J8 DC5V D[...]

60 1 1 DISASSEMBL Y INSTRUCTIONS 2. Removing the electronic control P .C. board and the display P .C. board. (1) Remove the front panel. (Refer to 1) (2) Remove the screw of the electrical cover . Remove the electrical cover . (3) Disconnect the room temperature thermistor and the con- nector from the indoor coil thermistor . (4) Remove the termina[...]

61 OPERA TING PROCEDURE PHOT OS 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 (CN21 1 and CN121) and the vane motor connector (CN151) on the electronic con- trol P .C. board. (5) Unhook the catc[...]

62 OPERA TING PROCEDURE PHOTOS 1. Removing the front panel (1) Remove the screw caps at the down of the front panel. Remove the screws. (2) Pull the panel down to your side slightly and unhook the catches at the top. 2. Removing the electronic control P .C. board (1) Remove the front panel. (Refer to 1) (2) Remove the electrical cover . (3) Remove [...]

63 OPERA TING 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 (CN21 1 and CN121) and the vane motor connector (CN151) on the electronic con- trol P .C. board. (5) Remove the screw[...]

64 1 1-3 MUH-07NV - MUH-09NV - MUH-07NV - MUH-09NV - OUTDOOR UNIT E2 E2 E1 E1 OPERA TING PROCEDURE PHOTOS 1. Removing the cabinet (1) Remove the top panel. (2) Remove the cabinet 2. Remove the deicer P .C. board (1) Remove the top panel, the service panel and the cabinet. (2) Disconnect all the connectors and the terminals on the deicer P .C. board[...]

65 OPERA TING PROCEDURE PHOTOS 4. Removing the outdoor fan motor (1) Remove the screws securing the outdoor fan motor . (2) Remove the lead clamps. (3) Disconnect the capacitor terminal and wire of the terminal. (4) Pull out the outdoor fan motor . 5. Removing the compressor (1) Remove the lead clamps. (2) Remove the screws securing the relay panel[...]

66 OPERA TING PROCEDURE PHOTOS 1. Removing the cabinet (1) Remove the screws of the cabinet. (2) Hold the down of the cabinet on the both side to remove the cabinet. 2. Removing the deicer P .C. board (1) Remove the service panel and the cabinet. (2) Disconnect all the connectors and the terminals on the deicer P .C. board. (3) Remove the deicer P [...]

67 OPERA TING PROCEDURE PHOTOS 3. Removing the outdoor fan motor (1) Remove the cabinet. (Refer to 1) (2) Disconnect the connector remove the clamp of fan motor lead wire. (3) Remove the propeller nut and remove the propeller . (4) Remove screws securing the fan motor . 4. Removing the compressor (1) Remove the cabinet. (Refer to 1) (2) Remove the [...]

68 OPERA TING PROCEDURE PHOTOS 1. Removing the electrical parts ( 1 ) Remove the screws and the top panel. ( 2 ) Remove the screw of the cover panel. T o remove the cover panel, pull it toward you and unhook the catch- es from the side panel. ( 3 ) Remove the screw of the service panel. T o remove the service panel, pull it down toward you and unho[...]

69 OPERA TING PROCEDURE PHOTOS 3. Removing the heat exchanger and the compressor ( 1 ) Remove the rear panel.Remove the valve bed, and open the rear panel to the rear to remove. NOTE : All panels are fixed by catches, and must be removed by shifting up and down. ( 2 ) Remove the screws of the right side panel and remove it. ( 3 ) Remove the screws [...]

70 12 P ARTS LIST 1 2 3 4 5 6 E02 154 000 E02 157 000 E02 199 000 E02 151 010 E02 164 100 E02 151 234 E02 166 234 E02 151 970 E02 166 067 FRONT P ANEL(WH) FRONT P ANEL(WH) FRONT P ANEL(WH) GRILL(WH) AIR FIL TER BOX(WH) BOX(WH) INST ALLA TION PLA TE SCREW CAP(WH) Symbol in Wiring Diagram Q'ty/unit 1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 1 1 2[...]

71 Symbol in Wiring Diagram Q'ty/unit Remarks Part No. NO. Part Name MSH-07NV - (WH) E1 E2 MSH-09NV - (WH) E1 E2 MSH-12NV- (WH) E1 E2 E02 166 235 E02 166 040 E02 141 702 E02 151 303 E02 151 300 E02 151 505 E02 151 302 E02 151 509 E02 151 308 E02 151 307 E02 198 375 E02 199 450 E02 200 450 E02 201 450 E02 152 395 E02 127 382 E02 085 385 E02 001[...]

72 E02 096 232 E02 085 297 E02 199 521 E02 085 245 E02 096 630 E02 128 900 E02 164 900 E02 047 506 E02 096 290 E02 096 662 E02 096 661 E02 085 515 E02 154 642 E02 077 961 E02 154 936 E02 159 936 E02 134 937 E02 199 936 E02 139 936 CABINET TOP P ANEL F AN GUARD SERVICE P ANEL OUTDOOR HEA T EXCHANGER COMPRESSOR COMPRESSOR COMPRESSOR RUBBER SET BASE S[...]

73 1 2 3 4 5 6 7 PROPELLER F AN OUTDOOR F AN MOTOR COMPRESSOR CAP ACITOR TERMINAL BLOCK DEFROST THERMISTOR DEICER P .C. BOARD REVERSING V AL VE COIL RA6V29- 25 + /440V AC MF C1 TB RT61 21S4 1 1 1 1 1 1 1 E02 085 501 E02 096 301 E02 085 353 E02 199 374 E02 096 310 E02 199 451 E02 154 490 Symbol in Wiring Diagram Q'ty/unit Remarks Part No. NO. P[...]

74 Part number that are circled is not shown in the illustration. 1 2 3 4 5 6 7 8 9 10 1 1 12 13 14 15 16 17 18 19 20 21 GRILL CABINET ASSEMBL Y BACK P ANEL SERVICE P ANEL COMPRESSOR RUBBER SET MOTOR SUPPORT OUTDOOR HEA T EXCHANGER COMPRESSOR BASE STOP V AL VE(LOQUID) STOP V AL VE(GAS) REVERSING V AL VE PROPELLER F AN OUTDOOR F AN MOTOR COMPRESSOR [...]

75 Symbol in Wiring Diagram Q'ty/unit 1PC/SET 3PCS/SET Remarks Part No. NO. Part Name MSH-18NV - MSH-24NV - 1 2 3 4 5 6 7 FRONT P ANEL(WH) GRILLE(WH) BOX(WH) AIR FIL TER INST ALLA TION PLA TE SCREW CAP(WH) LAMP P ANEL(WH) LAMP P ANEL(WH) (WH) E1 (WH) E3 E2 (WH) E1 E2 1 1 1 2 1 3 1 1 1 1 2 1 3 1 1 1 1 2 1 3 1 E02 138 000 E02 138 010 E02 143 234[...]

76 1 2 3 4 5 6 7 8 9 10 1 1 12 13 14 15 16 17 18 19 NO. E02 143 235 E02 143 040 E02 141 702 E02 141 300 E02 213 300 E02 001 505 E02 138 395 E02 320 395 E02 139 450 E02 198 450 E02 214 450 E02 141 302 E02 141 303 E02 138 329 E02 141 509 E02 198 375 E02 139 375 E02 278 375 E02 085 385 E02 141 468 E02 001 504 E02 138 307 E02 138 308 E02 127 382 E02 13[...]

77 Symbol in Wiring Diagram Q'ty/unit MUH-18NV - Remarks Part No. NO. Part Name E3 E2 E1 E02 141 232 E02 141 521 E02 141 245 E02 139 630 E02 139 515 E02 139 900 E02 139 290 E02 144 301 E02 141 501 E02 082 353 E02 004 340 E02 139 374 E02 198 374 E02 139 936 E02 139 937 E02 138 506 E02 139 662 E02 150 661 E02 140 233 E02 095 382 E02 139 451 E02 [...]

78 17 13 7 5 3 1 2 22 20 4 8 9 6 14 12 15 16 1 1 18 10 19 OUTDOOR UNIT STRUCTURAL P ARTS MUH-24NV - MUH-24NV - E2 E1 24 23 OB207t-3qxp 25/9/97 9:11 PM Page 78[...]

79 OUTDOOR UNIT STRUCTURAL P ARTS MUH-24NV - MUH-24NV - E2 E1 Symbol in Wiring Diagram Q'ty/unit MUH-24NV - Remarks Part No. NO. Part Name E1 MUH-24NV - E2 E02 214 232 E02 214 521 E02 214 245 E02 214 630 E02 214 515 E02 042 900 E02 214 290 E02 214 301 E02 214 501 E02 082 353 E02 010 342 E02 198 374 E02 214 249 E02 138 506 E02 010 662 E02 010 6[...]

New publication, effective Sep. 1997 Specifications subject to change without notice. C C Copyright 1997 MITSUBISHI ELECTRIC ENGINIEERING CO.,L TD Issued in Sep. 1997. No.OB207 646 Printed in Japan HEAD OFFICE MITSUBISHI DENKI BLDG.MARUNOUCHI T OKYO100 TELEX J24532 CABLE MELCO TOKYO 9.52 (3/8) 12.7 (1/2) 15.88 (5/8) Pipe length Cross-section Part N[...]