Mitsubishi Electric MS-18RV-E1 Service Manual Download Page 47

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TROUBLESHOOTING

11-1. 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 unit, and then after

confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.

2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel and the electronic

control P.C. board.

3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the

components.

4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

3. Troubleshooting procedure

1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.

To make sure, check how many times the abnormality indication is flashing on and off before starting service work.

2) Before servicing that the connector and terminal are connected properly.
3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and

the components for bursting and discoloration.

4) When troubleshooting, refer to the flow chart on page 48 and the check table on page 49.

4. How to replace batteries

MS-18RV -

MU-18RV -

MS-24RV -

MU-24RV -

MS-30RV -

MU-30RV -

Weak batteries may cause the remote controller malfunction.
In this case, replace the batteries to operate the remote controller normally.

Remove the front lid and insert batteries.

Then reattach the front lid.

Press the RESET button with tip end of ball point
pen or the like, and then use the remote controller.

NOTE : 1. If the RESET button is not pressed, the remote controller may not operate correctly.

2. In these illustrations remote controller of MS-18/24RV are used.

Insert the negative pole
of the batteries first.
Check if the polarity of
the batteries are correct.

RESET button

OB271--2.qxp 2/7/01 9:04 AM Page 47

Summary of Contents for MS-18RV-E1

Page 1: ...MENSIONS 10 6 WIRING DIAGRAM 13 7 REFRIGERANT SYSTEM DIAGRAM 17 8 PERFORMANCE CURVES 20 9 MICROPROCESSOR CONTROL 34 10 SERVICE FUNCTIONS 45 11 TROUBLESHOOTING 47 12 DISASSEMBLY INSTRUCTIONS 61 13 PARTS LIST 69 14 OPTIONAL PARTS BACK COVER Wireless type Models MS 18RV WH MU 18RV MS 24RV WH MU 24RV MS 30RV WH MU 30RV E1 E1 E1 E1 E1 E1 No OB271 MS 18RV MS 24RV E1 E1 ...

Page 2: ...anged SLEEP MODE function has removed ECONO COOL operation has added SWING button is removed but SWING MODE function is available by VANE CONTROL button MS 30RV New model MU 18NV MU 18RV MU 24NV MU 24RV 1 Outdoor model name has changed MU 30RV New model E1 E1 E2 E1 E4 E1 E1 E2 E1 E4 1 ...

Page 3: ...section Air cleaning filter option Deodorizing filter option Front panel Grille When the grille is open Operation Indicator MS 18RV MS 24RV E1 E1 OUTDOOR UNIT MU 18RV MU 24RV E1 E1 MS 18RV MS 24RV E1 E1 MS 18RV MS 24RV E1 E1 MS 30RV E1 MS 30RV E1 MU 30RV E1 MS 30RV E1 ...

Page 4: ...D CONTROL button OFF TIMER button HR button MIN button TIME SET button ON TIMER button RESET button ECONO COOL button VANE CONTROL button CLOCK SET button MS 18RV MS 24RV E1 E1 ACCESSORIES Indoor unit 1 2 3 4 5 6 7 Installation plate Installation plate fixing screw 4 o 25 mm Remote controller mouting hardware Fixing screw for 3 o 3 5 o 1 6 mm Black Battery AAA for remote controller Wireless remote...

Page 5: ...CLOCK FAN Open the front lid Signal transmitting section Operation display section OPERATE STOP ON OFF button TEMPERATURE buttons OPERATION SELECT button FAN SPEED CONTROL button OFF TIMER button HR button MIN button TIME SET button ON TIMER button RESET button ECONO COOL button VANE button Horizontal vane button CLOCK SET button LONG button WIDE VANE button Vertical vane button ...

Page 6: ...gle phase 220 240V 50Hz WHT BLK 183 8 BLK RED 250 5 1 015O320O190 14 5 3 10 10 850o605o290 900 MS32N1 MS 24RV E1 6 4 3 4 816 25 12 9 12 6 2 780 2 900 98 96 59 0 29 2 30 2 21 RA4V27 EE 45 1 260 MU 24RV E1 2 286 2 358 12 06 11 76 0 55 NH 47VMDT 2 200 C R 0 96 C S 2 07 RA6V60 AC WHT BLK 81 1 BLK RED 102 2 BLK YLW 92 2 61 53 860 886 2 2 15 MS 18RV E1 5 1 2 5 756 15 9 1 1 910 2 010 95 92 51 55 0 25 2 6...

Page 7: ...filling capacity R22 Refrigerating oil Model Thermistor RT62 at25 Thermistor RT63 at0 kW R h K h A A W A kW A A mm kg dB rpm k k k K h A A W mm kg dB rpm kg cc k k MS 30RV E1 Single phase 220 240V 50Hz 25 98 93 0 33 0 35 RC4V40 AA WHT BLK 138 2 BLK RED 159 0 1 100O325O227 16 5 47 1 280 3 10 10 10 MU 30RV E1 0 56 0 58 NH 56VNHT 2 700 C R 0 66 C S 1 58 RA6V75 AA WHT BLK 62 8 BLK YLW 55 9 YLW RED 26 ...

Page 8: ...ditions Cooling Dry bulb temperature 27 Wet bulb temperature 19 45 SPL dB A LINE NOTCH High MS 18RV E1 MS 24RV E1 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE Test conditions Cooling Dry bulb temperature 35 Wet...

Page 9: ...ARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 47 SPL dB A LINE NOTCH High MS 30RV E1 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE Test conditions Cooling Dry bulb temperature 35 Wet bulb temper...

Page 10: ...e 75 Installation plate Liquid line 8 0 5m Gas line 12 0 43m Insulation 50 O D 28 I D Insulation 28 Drain hose 16 Air out Air in REQUIRED SPACE 100mm or more 100mm or more 500mm or more 100mm or more 350mm or more 9 52 MU 24RV 6 35 MU18RV Drainage hole 16 2 Drainage 3holes 33 Air in Air in Air out 355 248 605 292 20 290 157 100 310 345 90 35 350 20 30 74 183 500 850 161 Service panel Liquid refrig...

Page 11: ...53 791 56 1068 1100 325 Air out Air in Insulation 28 Drain hose 16 Connected part O D Liquid line 9 52 0 5m Gas line 19 0 43m Insulation 50 O D 32 I D Installation plate Wall hole 75 Wireless remote controller Installation plate Indoor unit MS 30RV E1 INDOOR UNIT Unit mm ...

Page 12: ...0 330 362 17 15 39 5 27 5 Terminal block for indoor and outdoor unit connection Terminal block for power line Handle for moving 179 524 441 445 450 468 553 850 40 60 524 Service panel Refrigerant pipe flared connection 15 88 Refrigerant pipe flared connection 9 52 Knock out hole for front piping refrigerant drainage and wiring 42 45 104 33 Bottom piping hole 2 U shaped notched holes Drain hole 33 ...

Page 13: ... GRN YLW FROM INDOOR UNIT CONNECTING C S R MC 2 CIRCUIT BREAKER 50Hz 220 240V BRN DSAR GRN YLW LD1 REMOTE CONTROLLER 3 1 DISPLAY P C BOARD 101 CN 102 CN 151 CN BLU RECEIVER P C BOARD MV 5 F11 3 3 BLU N 220 240V CORD POWER SUPPLY TO OUTDOOR UNIT CONNECTING BRN L N GRN YLW TB 52C BRN 2 4 3 CN201 1 2 F12 WHT BLU BLU BLU TRANS HIC1 111 CN 4 2 1 C11 CN211 BLK WHT GRY RED RT11 MF 3 121 CN CN 112 NR11 IC...

Page 14: ...RED GRY RED WHT WHT BLK RED BLU BLU RED ORN WHT BLK YLW 7 8 2 1 B L U 3 5 6 1 FROM INDOOR UNIT CONNECTING X1 MF RED ORN WHT YLW BLK C S R C1 220 240V BLU BLU BRN BLU F12 2 1 CN201 3 4 BRN YLW BLU TB GRN YLW 3 RED TO OUTDOOR UNIT CONNECTING CN 121 3 MF BLU F11 RT11 RED GRY WHT BLK WHT CN211 C11 1 2 4 CN 111 1 3 DSAR WHT WHT 1 TRANS NR11 HIC1 CN 112 IC141 RT12 52C N L 220 240V 220 240V 2 ELECTRONIC ...

Page 15: ... MV2 NR11 RT11 RT12 RT13 SYMBOL C11 F11 HIC1 MF MV1 NAME NAME NAME INDOOR FAN CAPACITOR FUSE 3 15A DC DC CONVERTER INDOOR FAN MOTOR INNER PROTECTOR VANE MOTOR HORIZONTAL VANE MOTOR VERTICAL VARISTOR ROOM TEMPERATURE THERMISTOR INDOOR COIL THERMISTOR MAIN INDOOR COIL THERMISTOR SUB SOLID STATE RELAY TERMINAL BLOCK NOTE 1 About the outdoor side electric wiring refer to the outdoor unit electric wiri...

Page 16: ...TB1 SYMBOL CZ C1 C2 DSAR F61 LEV MC NAME NAME NAME CZ SURGE ABSORBER COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR SURGE ABSORBER FUSE 3 15A EXPANSION VALVE COIL COMPRESSOR INNER PROTECTOR OUTDOOR FAN MOTOR INNER PROTECTOR VARISTOR DISCHARGE TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR SOLID STATE RELAY SOLID STATE RELAY TERMINAL BLOCK TERMINAL BLOCK TRANSFORMER CONTACTOR COMPRESSOR CONTACTO...

Page 17: ...t Outdoor heat exchanger Refrigerant flow in cooling Strainer Unit mm Distributor Unit mm MS 24RV E1 MU 24RV E1 INDOOR UNIT OUTDOOR UNIT Indoor heat exchanger Room temperature thermistor RT11 Refrigerant pipe 15 88 with heat insulator Flared connection Indoor coil thermistor RT12 Refrigerant pipe 9 52 with heat insulator Stop valve Capillary tube 3 0X 2 0X700 Compressor Accumulator Stop valve with...

Page 18: ...with service port Capillary tube 3 6 2 4 50 Refrigerant flow in cooling Compressor Refrigerant pipe 15 88 with heat insulator Refrigerant pipe 9 52 with heat insulator Indoor coil thermistor RT12 main LEV Strainer Strainer Accumulator Ambient temperature thermistor RT63 Strainer Capillary tube 4 0 2 4 200 Upper path Capillary tube 4 0 2 4 100 Lower path MS 30RV E1 INDOOR UNIT OUTDOOR UNIT Unit mm ...

Page 19: ... MAX HEIGHT DIFFERENCE ADDITIONAL REFRIGERANT CHARGE R22 g Model Refrigerant piping Max length m A Piping size O D mm Length of connecting pipe m Indoor unit Gas 0 43 Liquid 0 5 Gas 15 88 Liquid 6 35 9 52 Outdoor unit Gas 0 Liquid 0 MS 18RV E1 MU 18RV E1 MS 24RV E1 MU 24RV E1 15 30 MS 30RV E1 MU 30RV E1 MAX REFRIGERANT PIPING LENGTH Calculation Xg 15g mx Refrigerant piping length m 7 Outdoor unit ...

Page 20: ...wet dry bulb temperature and the indoor outlet air wet dry bulb temperature for your reference at service How to measure the indoor air wet bulb dry bulb temperature difference 1 Attach at least 2 sets of wet and dry bulb thermometers to the indoor air intake as shown in the figure and at least 2 sets of wet and dry bulb thermometers to the indoor air outlet The thermometers must be attached to th...

Page 21: ...6 7 8 9 10 11 220V 240V 18 32 MU 18RV E1 MU 18RV E1 Ambient temperature C Ambient humidity Ambient temperature C Ambient humidity Outdoor low pressure kgf F Gauge MPa Gauge Outdoor unit current A 8 7 6 5 4 3 MU 24RV E1 MU 24RV E1 Ambient temperature C Ambient humidity Ambient temperature C Ambient humidity Outdoor low pressure kgf F Gauge MPa Gauge Outdoor unit current A 220 240V 220V 240V MU 30RV...

Page 22: ...0 0 48 0 36 0 24 0 76 0 64 0 52 0 40 0 28 0 80 0 68 0 56 0 44 0 32 0 84 0 72 0 60 0 48 0 36 0 88 0 76 0 64 0 52 0 40 0 92 0 80 0 68 0 56 0 44 1604 1700 1604 1700 1767 1604 1700 1767 1604 1700 1767 1834 1604 1700 1767 1834 1604 1700 1767 1834 1929 1604 1700 1767 1834 1929 1604 1700 1767 1834 1929 1604 1700 1767 1834 1929 1604 1700 1767 1834 1929 1604 1700 1767 1834 1929 1604 1700 1767 1834 1929 5 5...

Page 23: ...0 0 48 0 36 0 24 0 76 0 64 0 52 0 40 0 28 0 80 0 68 0 56 0 44 0 32 0 84 0 72 0 60 0 48 0 36 0 88 0 76 0 64 0 52 0 40 0 92 0 80 0 68 0 56 0 44 1986 2044 1986 2044 2139 1986 2044 2139 1986 2044 2139 2197 1986 2044 2139 2197 1986 2044 2139 2197 2273 1986 2044 2139 2197 2273 1986 2044 2139 2197 2273 1986 2044 2139 2197 2273 1986 2044 2139 2197 2273 1986 2044 2139 2197 2273 1986 2044 2139 2197 2273 4 4...

Page 24: ...88 1789 1859 1688 1789 1859 1688 1789 1859 1930 1688 1789 1859 1930 1688 1789 1859 1930 2030 1688 1789 1859 1930 2030 1688 1789 1859 1930 2030 1688 1789 1859 1930 2030 1688 1789 1859 1930 2030 1688 1789 1859 1930 2030 1688 1789 1859 1930 2030 5 51 5 81 5 51 5 81 6 12 5 51 5 81 6 12 5 51 5 81 6 12 6 43 5 51 5 81 6 12 6 43 5 51 5 81 6 12 6 43 6 73 5 51 5 81 6 12 6 43 6 73 5 51 5 81 6 12 6 43 6 73 5 ...

Page 25: ...90 2151 2251 2090 2151 2251 2090 2151 2251 2312 2090 2151 2251 2312 2090 2151 2251 2312 2392 2090 2151 2251 2312 2392 2090 2151 2251 2312 2392 2090 2151 2251 2312 2392 2090 2151 2251 2312 2392 2090 2151 2251 2312 2392 2090 2151 2251 2312 2392 4 41 4 72 4 41 4 72 5 02 4 41 4 72 5 02 4 41 4 72 5 02 5 36 4 41 4 72 5 02 5 36 4 41 4 72 5 02 5 36 5 64 4 41 4 72 5 02 5 36 5 64 4 41 4 72 5 02 5 36 5 64 4 ...

Page 26: ...5 2419 2530 2669 2224 2335 2419 2530 2669 2224 2335 2419 2530 2669 2224 2335 2419 2530 2669 2224 2335 2419 2530 2669 2224 2335 2419 2530 2669 7 20 7 52 7 20 7 52 7 87 7 20 7 52 7 87 7 20 7 52 7 87 8 26 7 20 7 52 7 87 8 26 7 20 7 52 7 87 8 26 8 58 7 20 7 52 7 87 8 26 8 58 7 20 7 52 7 87 8 26 8 58 7 20 7 52 7 87 8 26 8 58 7 20 7 52 7 87 8 26 8 58 7 20 7 52 7 87 8 26 8 58 7 20 7 52 7 87 8 26 8 58 3 3...

Page 27: ...6 2947 3058 3169 2724 2836 2947 3058 3169 2724 2836 2947 3058 3169 2724 2836 2947 3058 3169 2724 2836 2947 3058 3169 2724 2836 2947 3058 3169 5 76 6 14 5 76 6 14 6 53 5 76 6 14 6 53 5 76 6 14 6 53 6 91 5 76 6 14 6 53 6 91 5 76 6 14 6 53 6 91 7 30 5 76 6 14 6 53 6 91 7 30 5 76 6 14 6 53 6 91 7 30 5 76 6 14 6 53 6 91 7 30 5 76 6 14 6 53 6 91 7 30 5 76 6 14 6 53 6 91 7 30 5 76 6 14 6 53 6 91 7 30 2 6...

Page 28: ...20 7 52 7 87 7 20 7 52 7 87 7 20 7 52 7 87 8 26 7 20 7 52 7 87 8 26 7 20 7 52 7 87 8 26 8 58 7 20 7 52 7 87 8 26 8 58 7 20 7 52 7 87 8 26 8 58 7 20 7 52 7 87 8 26 8 58 7 20 7 52 7 87 8 26 8 58 7 20 7 52 7 87 8 26 8 58 7 20 7 52 7 87 8 26 8 58 3 31 2 56 3 60 2 86 2 05 3 89 3 16 2 36 4 18 3 46 2 68 1 82 4 46 3 76 2 99 2 15 4 75 4 06 3 31 2 48 1 54 5 04 4 36 3 62 2 81 1 89 5 33 4 66 3 94 3 14 2 23 5 ...

Page 29: ...76 6 14 6 53 5 76 6 14 6 53 5 76 6 14 6 53 6 91 5 76 6 14 6 53 6 91 5 76 6 14 6 53 6 91 7 30 5 76 6 14 6 53 6 91 7 30 5 76 6 14 6 53 6 91 7 30 5 76 6 14 6 53 6 91 7 30 5 76 6 14 6 53 6 91 7 30 5 76 6 14 6 53 6 91 7 30 5 76 6 14 6 53 6 91 7 30 2 65 2 09 2 88 2 33 1 70 3 11 2 58 1 96 3 34 2 83 2 22 1 52 3 57 3 07 2 48 1 80 3 80 3 32 2 74 2 07 1 31 4 03 3 56 3 00 2 35 1 61 4 26 3 81 3 26 2 63 1 90 4 ...

Page 30: ... 2704 2839 2941 3076 3245 2704 2839 2941 3076 3245 2704 2839 2941 3076 3245 2704 2839 2941 3076 3245 2704 2839 2941 3076 3245 9 45 9 87 9 45 9 87 10 33 9 45 9 87 10 33 9 45 9 87 10 33 10 84 9 45 9 87 10 33 10 84 9 45 9 87 10 33 10 84 11 26 9 45 9 87 10 33 10 84 11 26 9 45 9 87 10 33 10 84 11 26 9 45 9 87 10 33 10 84 11 26 9 45 9 87 10 33 10 84 11 26 9 45 9 87 10 33 10 84 11 26 9 45 9 87 10 33 10 8...

Page 31: ...3448 3583 3718 3853 3312 3448 3583 3718 3853 3312 3448 3583 3718 3853 3312 3448 3583 3718 3853 3312 3448 3583 3718 3853 3312 3448 3583 3718 3853 7 56 8 06 7 56 8 06 8 57 7 56 8 06 8 57 7 56 8 06 8 57 9 07 7 56 8 06 8 57 9 07 7 56 8 06 8 57 9 07 9 58 7 56 8 06 8 57 9 07 9 58 7 56 8 06 8 57 9 07 9 58 7 56 8 06 8 57 9 07 9 58 7 56 8 06 8 57 9 07 9 58 7 56 8 06 8 57 9 07 9 58 7 56 8 06 8 57 9 07 9 58 ...

Page 32: ...45 9 87 10 33 9 45 9 87 10 33 10 84 9 45 9 87 10 33 10 84 9 45 9 87 10 33 10 84 11 26 9 45 9 87 10 33 10 84 11 26 9 45 9 87 10 33 10 84 11 26 9 45 9 87 10 33 10 84 11 26 9 45 9 87 10 33 10 84 11 26 9 45 9 87 10 33 10 84 11 26 9 45 9 87 10 33 10 84 11 26 4 16 3 16 4 54 3 55 2 48 4 91 3 95 2 89 5 29 4 34 3 31 2 17 5 67 4 74 3 72 2 60 6 05 5 13 4 13 3 03 1 80 6 43 5 53 4 55 3 47 2 25 6 80 5 92 4 96 3...

Page 33: ... 7 56 8 06 8 57 7 56 8 06 8 57 7 56 8 06 8 57 9 07 7 56 8 06 8 57 9 07 7 56 8 06 8 57 9 07 9 58 7 56 8 06 8 57 9 07 9 58 7 56 8 06 8 57 9 07 9 58 7 56 8 06 8 57 9 07 9 58 7 56 8 06 8 57 9 07 9 58 7 56 8 06 8 57 9 07 9 58 7 56 8 06 8 57 9 07 9 58 3 33 2 58 3 63 2 90 2 06 3 93 3 23 2 40 4 23 3 55 2 74 1 81 4 54 3 87 3 08 2 18 4 84 4 19 3 43 2 54 1 53 5 14 4 52 3 77 2 90 1 92 5 44 4 84 4 11 3 27 2 30...

Page 34: ... indoor unit indicates the operation state INDOOR UNIT DISPLAY SECTION The following indication does not depend on the shape of lamp MS 18RV MS 24RV MS 30RV E1 E1 E1 ON OFF FAN TOO WARM TOO COOL VANE MODE ECONO COOL STOP START HR MIN I FEEL COOL DRY PM CLOCK AM RESET CLOCK FAN OPERATION SELECT button FAN SPEED CONTROL button OFF TIMER button HR button MIN button TIME SET button ON TIMER button RES...

Page 35: ...than 25 24 Initial room temperature minus 2 Initial room temperature minus 2 w1 w 1 When the system is restarted with the remote controller the system operates with the previous set temperature regard less of the room temperature at restart The set temperature is calculated by the previous set temperature 5 TEMPERATURE buttons In I FEEL CONTROL mode set temperature is decided by the microprocessor...

Page 36: ... operating b Indoor fan speed is Low or Med c Room temperature is below 26 C When compressor stops the accumulated time is cancelled and when compressor restarts time counting starts from the beginning Time counting also stops temporarily when the indoor fan speed becomes High or the room temperature exceeds 26 C However when two of the above conditions b and c are satisfied again Time accumulatio...

Page 37: ...er When the thermostat is ON the compressor repeats 8 minutes ON and 3 minutes OFF When the thermostat is OFF the compressor repeats 4 minutes OFF and 1 minute ON When the room temperature is under 23 C When the thermostat is ON the compressor repeats 2 minutes ON and 3 minutes OFF When the thermostat is OFF the compressor repeats 4 minutes OFF and 1 minute ON Operation time chart Example Thermost...

Page 38: ...rmality Refer to page 49 9 3 DRY OPERATION 1 Press OPERATE STOP ON OFF button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select DRY mode with the OPERATION SELECT button 3 The microprocessor reads the room temperature and determines the set temperature Set tempera ture is as shown on the right chart Thermostat SET TEMP does not work The other operations are same as DRY...

Page 39: ...peration is stopped by the emergency operation c When the ON TIMER is on standby 1 In COOL and DRY operation 2 In FAN operation Vane angle is fixed to Angle 1 Vane angle is fixed to Angle 4 AUTO Horizontal Middle Downward Swing 9 6 AUTO VANE OPERATION 1 Horizontal vane 1 Vane motor drive These models are equipped with a stepping motor for the horizontal vane The rotating direction speed and angle ...

Page 40: ...his operation next downward blow time is decided Then when the downward blow has been finished next upward blow time is decided For initial 10 minutes the swing operation is performed in table G H for quick cooling but G Tp w 1 is 24 or less Also after 10 minutes when the difference of set temperature and room temperature is more than 2 the swing opera tion is performed in table D H for more cooli...

Page 41: ...about 10 minutes NOTE2 Reset the timer in the following cases or the set time may deviate and other malfunctions may occur A power failure occurs The circuit breaker functions 6 1 2 3 4 5 SWING 2 Vertical vane MS 30RV only 1 Vane motor drive This model is equipped with a stepping motor for the vertical vane The rotating direction speed and angle of the motor are controlled by pulse signals approx ...

Page 42: ... test run or emergency operation the horizontal vane operates in VANE AUTO mode Emergency operation continues until the EMERGENCY OPERATION switch is pressed again or the unit receives any sig nal from the remote controller In case of latter normal operation will start NOTE Do not press the EMERGENCY OPERATION switch during normal operation EMERGENCY OPERATION switch Press once Cool Press once aga...

Page 43: ...has started LEV opening is corrected to be once every 2 minutes so that discharge temperature becomes the target discharge temperature When the discharge temperature is lower than target one LEV is corrected in closed direction when the discharge temperature is higher than target one LEV is corrected in opening direction At thermostat OFF Opening in stop 150 pulse LEV is set to the initial opening...

Page 44: ...mode or the unit status as follows Tb COOL Normal COOL RT is less than 2 or RT is 2 or more and less than 3 COOL RT is 3 or more NOTE Target discharge temperature Tb 90 75 65 Operation mode NOTE When the discharge temperature Ta is 50 or less on the cool operation LEV opening is set in 54 pulse When this state continues for 20 minutes the compressor is stopped and restarts in 3 minutes When the co...

Page 45: ...ry about remote controller When the power supply is turned on and indoor unit receives the first signals from the remote controller the remote controller number is desig nated as the indoor unit number Therefore at and after the second time indoor unit accepts the remote controller of the initial setting number At setting error turn the power supply off to cancel the individual operation and then ...

Page 46: ... the main power 220 240V AC has been cut the operation settings remain 2After the power is restored the unit restarts automatically according to the memory However it takes at least 3 minutes for the compressor to start running NOTE The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller If main power is turned off or a power f...

Page 47: ... indicate an abnormality To make sure check how many times the abnormality indication is flashing on and off before starting service work 2 Before servicing that the connector and terminal are connected properly 3 If the electronic control P C board is supposed to be defective check the copper foil pattern for disconnection and the components for bursting and discoloration 4 When troubleshooting r...

Page 48: ...Cause Indoor unit Trouble of indoor fan motor w1 6 time flash Cause Outdoor unit Trouble of thermistor in outdoor unit w1 7 time flash Cause Outdoor unit Trouble of outdoor control system Refer to F How to check mis wiring When outdoor unit doesn t work on page 56 Check room temperature thermistor and indoor coil thermis tor Refer to Test point diagram and voltage on page 58 or 59 Refer to A Check...

Page 49: ...ature has been 50 or less on cool operation or is 49 or less on heat operation for 20 minutes Abnormal point Outdoor unit does not operate Room tempera ture thermistor 2 time flash 2 5 second OFF Detect Indoor coil room temperature thermistor short or open circuit every 8 seconds during operation Refer to the characteristics of main indoor coil thermistor sub indoor coil thermistor and room temper...

Page 50: ...stance with a tester Before measurement hold the thermistor with your hands to warm it up Part temperature 0 C 40 C Normal 120 k 800 k Abnormal Open or short circuit Normal 5 k 60 k Abnormal Open or short circuit Motor part Sensor part Measure the resistance between the terminals with a tester Part temperature 10 C 30 C Color of lead wire BRN YLW YLW GRY Abnormal Remain 0V or 5V Normal 4 5 5 5V Me...

Page 51: ...37 0 Measure the resistance with a tester Part temperature 10 C 40 C Color of lead wire WHT BLK BLK YLW YLW RED Abnormal Open or short circuit Normal MS 30RV 55 4 67 7 49 3 60 3 22 9 28 0 Color of lead wire WHT BLK BLK RED BLK YLW Abnormal Open or short circuit Normal MS 18RV 102 126 97 120 MS 24RV 71 88 90 111 81 100 MAIN AUX BLK RED WHT ORN P MAIN1 AUX BLK YLW RED WHT ORN P MAIN2 Vane motor MV M...

Page 52: ... short circuit or open circuit Indoor unit operates by pressing the EMERGENCY OPERATION switch but doesn t operate with the remote controller Turn on a radio to AM and press switch on the remote controller Is noise heard from radio Are there any fluorescent lights of inverter or rapid start type within the range of 1m Measure the voltage between receiver P C board connector No 2 and No 1 when remo...

Page 53: ...11 burnt Replace the varistor Yes Turn OFF the power supply Remove indoor fan motor connector CN211 and vane motor connector CN151 from the indoor electronic control P C board and turn ON the power supply No No Does the unit operate with the remote controller Does the OPERATION INDICATORE lamp light up by pressing the EMERGENCY OPERATION switch No Yes 1 Pull out the power supply cord 2 Measure the...

Page 54: ...s Is there 220 240V AC between CN730 1 3 on the deicer P C board w1 Replace the deicer P C board Replace the deicer P C board No Yes No Is there 220 240V AC between 1 L1 on the compressor contactor 52C and N on the outdoor terminal block No No Make the connection of wiring correct Yes Yes Yes Is there 220 240V AC between CN730 1 3 or 2 3 on the deicer P C board w1 Operate the unit in COOL mode by ...

Page 55: ...power supply again 3 Operate the unit in COOL mode by pressing the EMERGENCY OPERATION switch 4 Operate the unit for 1 minute or more and stop it by pressing the EMERGENCY OPERATION switch again Ok No After 30 seconds does outdoor fan motor stop Replace the deicer P C board Yes Ok No Is there 220 240V AC between 2 T1 on the compressor contactor 52C and N on the outdoor terminal block Yes Replace t...

Page 56: ...ace the indoor electronic control P C board Is there 220 240V AC between L N on the terminal block of the outdoor unit Yes No Check of outdoor power supply and connecting of wiring Yes No Make the wiring between CN730 on the deicer P C board and outdoor terminal block correct Refer to page 60 Replace the deicer P C board Yes Yes Yes After 3 minutes mis wiring is indicated 0 5 second ON 0 5 second ...

Page 57: ...ne LEV operates in full opening direction Is LEV coil properly fixed to the body Cooling does not operate Ok Do you hear LEV click click Do you touch LEV and feel it vibrate Does the resistance of thermistor have the characteristics No Yes Yes Yes No LEV CN724 WHT RED RED ORN YLW BRN BRN BLU Resistance 30 3 37 0 Characteristics of LEV coil No Properly fix LEV coil to the body Replace the DEICER P ...

Page 58: ...perature thermistor RT11 Fan motor power supply Fuse F11 250V AC 3 15A Power supply input 220 240V AC 5V DC Indoor coil thermistor RT12 Timer short mode point JPS JPG Refer to page 45 Emergency operation switch 12V DC Room temperature thermistor RT11 C144 C144 JPG JP45 Auto restart function Cut the Resistor JR06 Refer to page 46 ...

Page 59: ...put 220 240V AC 5V DC Indoor coil thermistor RT12 main Timer short mode point JPS JPG Refer to page 45 Emergency operation switch 12V DC Indoor coil thermistor RT12 main RT13 sub Room temperature thermistor RT11 Room temperature thermistor RT11 Auto restart function Cut the Resistor JR07 Refer to page 46 Indoor coil thermistor RT13 sub PS132 ...

Page 60: ...00 700 800 900 Ambient temperature thermistor RT63 20 10 0 10 20 30 40 0 10 20 30 40 50 60 70 80 90 100 Temperature Resistance k CN662 1 2 Discharge tem perature ther mistor RT62 Refer to page 57 CN662 3 4 Ambient tempera ture thermistor RT63 Refer to page 57 LEV connector CN724 Fan motor connector CN711 Varistor NR61 CN7301 3 220 240V AC Refer to page 56 R601 10V DC Refer to page 56 Refer to page...

Page 61: ...move 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 12 1 MS 18RV MS 24RV INDOOR UNIT E1 E1 Photo 2 Photo 1 Front panel Screws 2 Removing the electronic control P C board the receiver P C board and the display P C board 1 Remove the front panel Refer to 1 2 Remove the electrical cover 3 Remove the screw o...

Page 62: ...e motor 4 Removing the vane motor 1 Remove the front panel Refer to 1 2 Remove the electrical box Refer to 3 3 Pull out the drain hose from the nozzle assembly remove the nozzle assembly 4 Remove the screws both upper and lower of the vane motor disconnect the connector 5 Remove the vane motor 5 Removing the indoor fan motor and the line flow fan 1 Remove the front panel 2 Remove the electrical bo...

Page 63: ... Receiver P C board 2 Removing the electronic control P C board the receiver 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 Remove the screw of the V A clamp Remove the V A clamp 4 Remove the screw of the terminal block 5 Remove the screw of the ground wire 6 Disconnect all the connectors and all the ...

Page 64: ...m the nozzle assembly remove the nozzle assembly 6 Remove the screws of the vane motor disconnect the con nector 7 Remove the vane motor Screws fixing the fan motor 5 Removing the line flow fan and the indoor fan motor 1 Remove the front panel Refer to 1 2 Remove the electrical box Refer to 3 3 Pull out the drain hose from the nozzle assembly remove the nozzle assembly 4 Remove the water cut 5 Sli...

Page 65: ... 2 Removing the electrical parts 1 Remove the service panel and the cabinet 2 Remove the following parts Compressor capacitor C1 Outdoor fan capacitor C2 Terminal block TB 12 3 MU 18RV MU 24RV OUTDOOR UNIT E1 E1 Photo 1 Photo 3 Photo 2 Screws of the cabinet Screws of the cabinet Service panel Outdoor fan capacitor C2 Compressor capacitor C1 Terminal block TB ...

Page 66: ...from the glass terminal of the com pressor 5 Recover gas from the refrigerant circuit 6 Disconnect the welded part of the discharge pipe 7 Disconnect the welded part of the suction pipe 8 Remove nuts fixing the compressor 9 Remove the compressor NOTE Before using a burner reclaim gas from the pipes until the pressure gauge shows 0 kg cm2 MPa Use the burner under the condition that gas can be recov...

Page 67: ...Then lift it and unhook the catches to remove 3 Removing the propeller fan and the outdoor fan motor 1 Remove the cabinet Refer to 1 2 Remove the propeller fan nut and the propeller fan NOTE Loose the propeller fan in the rotating direction for removal When attaching the propeller fan align the mark on the propeller fan and the motor shaft cut section Set the propeller fan in position by using the...

Page 68: ... 2 Remove the screws of the side panel and the side panel 3 Remove the screws of the rear guard and the rear guard 4 Remove the screws of the separator support plate and the separator support plate 5 Remove the screws of the motor support and the motor support 6 Remove the relay panel Disconnect the fan motor lead wires 7 Remove the soundproof felt 8 Remove the screws of the separator and the sepa...

Page 69: ...Diagram Q ty unit Including 4 5 3PCS SET Remarks Part No NO Part Name 1 1 1 1 3 2 1 1 1 1 1 3 2 1 MS 18RV E1 WH MS 24RV E1 WH Part numbers that is circled is not shown in the illustration Optional parts See back cover 2 1 6 5 4 3 E02 141 620 E02 138 667 E02 176 667 E02 138 666 8 9 10 INDOOR HEAT EXCHANGER UNION LIQUID UNION LIQUID UNION GAS 6 35 9 52 15 88 1 1 1 1 1 1 SCREW CAP 13 1 INDOOR UNIT ST...

Page 70: ...ONIC CONTROL P C BOARD ELECTRONIC CONTROL P C BOARD INDOOR FAN MOTOR INDOOR FAN MOTOR FAN MOTOR RUBBER MOUNT DISPLAY P C BOARD VARISTOR FUSE THERMAL FUSE THERMAL FUSE SURGE ABSORBER SURGE ABSORBER Symbol in Wiring Diagram Q ty unit 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 AUTO RESTART AUTO RESTART RA4V27 RA4V27 2PCS SET 3 15A 93 93 Remarks Part No NO Part Name RT12 MV TB TB RT11 MF MF NR11 F11 F12 ...

Page 71: ...BACK PANEL CABINET GRILLE PROPELLER FAN MOTOR SUPPORT MOTOR SUPPORT COMPRESSOR RUBBER SET COMPRESSOR COMPRESSOR BASE BASE STOP VALVE GAS STOP VALVE LIQUID STOP VALVE LIQUID SERVICE PANEL OUTDOOR FAN MOTOR OUTDOOR FAN MOTOR OUTDOOR HEAT EXCHANGER OUTDOOR HEAT EXCHANGER TERMINAL BLOCK TERMINAL BLOCK OUTDOOR FAN CAPACITOR COMPRESSOR CAPACITOR TERMINAL BLOCK CAPILLARY TUBE CAPILLARY TUBE FUSE COMPRESS...

Page 72: ... PANEL Symbol in Wiring Diagram Q ty unit Including No 4 5 6 4PCS SET 3PCS SET Remarks Part No NO Part Name 1 2 3 4 5 6 7 8 9 1 1 1 4 3 1 2 1 1 WH 13 7 INDOOR UNIT HEAT EXCHANGER 2 4 5 7 6 1 10 8 11 12 3 CATCH SCREW CAP E02 527 620 E02 527 666 E02 527 667 INDOOR HEAT EXCHANGER UNION GAS UNION LIQUID 15 88 9 52 10 11 12 1 1 1 13 7 INDOOR UNIT HEAT EXCHANGER 13 6 INDOOR UNIT STRUCTURAL PARTS Part nu...

Page 73: ...ERATURE THERMISTOR TERMINAL BLOCK INDOOR COIL THERMISTOR VANE MOTOR SUPPORT SET RIGHT VANE MOTOR SUPPORT SET LEFT Symbol in Wiring Diagram Q ty unit 3 15A RC4V40 Including RUBBER MOUNT RIGHT LEFT UP DOWN AUTO RESTART Including No 16 4P Remarks Part No NO Part Name F11 NR11 MF MV2 MV1 RT11 TB RT12 RT13 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 WH Part numbers that are circled are not shown in the...

Page 74: ...74 MU 30RV 13 10 OUTDOOR UNIT STRUCTURAL PARTS ELECTRICAL PARTS AND FUNCTIONAL PARTS E1 1 3 5 27 2 25 24 10 7 23 6 11 28 8 4 2 13 19 14 22 21 26 9 20 16 15 12 18 17 A B 9 ...

Page 75: ... EXCHANGER OUTDOOR FAN MOTOR PROPELLER FAN PROPELLER FAN NUT BASE CABINET HANDLE FAN GUARD EXPANSION VALVE COIL EXPANSION VALVE COMPRESSOR RUBBER SET COMPRESSOR STOP VALVE LIQUID STOP VALVE GAS SERVICE PANEL COVER PANEL TERMINAL BLOCK TERMINAL BLOCK OUTDOOR FAN CAPACITOR SURGE ABSORBER COMPRESSOR CONTACTOR COMPRESSOR CAPACITOR DEICER P C BOARD REAR PANEL REAR GUARD SIDE PANEL MOTOR SUPPORT FUSE VA...

Page 76: ...ILTER during unit operation 14 2 DEODORIZING FILTER DEODORIZING FILTER removes ammonia and hydrogen sulphide emitted from tobacco and odor of pets Clean DEODORIZING FILTER every two weeks If the filter is particularly dirty clean the filter more often For cleaning soak the filter in warm water for a while and then wash and rinse it Dry the filter in the shade thor oughly When the filter color is s...

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Mitsubishi Electric MS-18RV-E1, Service Manual

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