Download Mitsubishi MSH-A18ND Service manual
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OB404A--1.qxp 06.4.26 6:01 PM Page 1 Revision A: ● Remote controller model “KM04B” has been added. Please void OB404. SPLIT-TYPE, AIR CONDITIONERS INDOOR UNIT SERVICE MANUAL No. OB404 REVISED EDITION-A Wireless type Models MS-A18NDMS-A24NDMS-A30ND- S1 S1 S1 Outdoor unit service manual MU-A·ND Series (OB405) CONTENTS MS-A18ND MS-A24ND MS-A30ND 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················2 3. SPECIFICATION·················································4 4. OUTLINES AND DIMENSIONS ·························5 5. WIRING DIAGRAM ············································6 6. REFRIGERANT SYSTEM DIAGRAM ················8 7. SERVICE FUNCTIONS ······································9 8. TROUBLESHOOTING······································11 9. DISASSEMBLY INSTRUCTIONS ····················19 10. PARTS LIST······················································21 11. RoHS PARTS LIST···········································24 NOTE: • This service manual describes technical data of the indoor units. • RoHS compliant products have <G> mark on the spec name plate. For servicing of RoHS compliant products, refer to the RoHS Parts List. TM OB404A--1.qxp 06.4.26 6:01 PM Page 2 Revision A: • Remote controller model “KM04B” has been added. There are two remote controller models for “ S1 ”. (KP0B, KM04B) You can use the remote controller model “KP0B” and “KM04B”. The remote controller model “KM04B” is supplied as service parts for “ 1 S1 ”. TECHNICAL CHANGES w : change Frequency New Model Old Model Indoor unit:Unit size:W1,015mmoH320mmoD190mm ➞ W1,100mmoH325mmoD258mm Electricity receiving unit: Indoor unit ➞ Outdoor unit Rated voltage: 220V ➞ 220-230V 60Hz MS-A18ND - S1 MS-18TN - S1 MS-18SN w w w w w w Frequency 60Hz New Model MS-A24ND - S1 Old Model MS-24TN - S1 MS-24SN Indoor unit:Unit size:W1,015mmoH320mmoD190mm ➞ W1,100mmoH325mmoD258mm w w Electricity receiving unit: Indoor unit ➞ Outdoor unit w w Rated voltage: 220V ➞ 220-230V w w C1 C2 MS-A30ND - S1 New model 2 PART NAMES AND FUNCTIONS INDOOR UNIT MS-A18ND MS-A24ND MS-A30ND Air cleaning filter : White bellows type Grille Air inlet Front Panel Catechin air filter Remote control receiving section Vertical vanes Horizontal vane Remote controller Operation section Display section (When the grille is opened) Operation indicator lamp Emergency operation switch Remote control receiving section 2 OB404A--1.qxp 06.4.26 6:01 PM Page 3 ACCESSORIES 1 2 3 4 5 6 7 8 9 MS-A18ND MS-A24ND MS-A30ND 1 7 1 2 2 1 1 2 Installation plate Installation plate fixing screw 4 x 25 mm Remote controller holder Fixing screw for 3 3.5 x 16 mm (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping) Air cleaning filter Pipe cover REMOTE CONTROLLER MS-A18ND MS-A24ND MS-A30ND Signal transmitting section Operation display section OPERATE/ STOP (ON/ OFF)button PM AM TOO ON/OFF WARM TOO COOL TEMPERATURE buttons Open the front lid. Indication of remote controller model is on back. CLOCK PM AM TOO ON/OFF WARM VANE button (Horizontal vane button) TOO COOL FAN STOP VANE START FAN FAN SPEED CONTROL button OFF-TIMER button I FEEL COOL DRY MODE WIDE VANE HR. OPERATION SELECT button ECONO COOL LONG ECONO COOL button RESET CLOCK WIDE VANE button (Vertical vane button) MIN. ON-TIMER button HR. button MIN. button (TIME SET button) CLOCK SET button LONG button RESET button 3 OB404A--1.qxp 3 06.4.26 6:01 PM Page 4 SPECIFICATION MS-A18ND Indoor model MS-A24ND Cooling Single phase 220-230V, 60Hz Function Power supply Special remarks Fan motor Electrical data Capacity Air flow (High/Med./Low) Running current Power input Auxiliary heater Power factor Fan motor current Model Winding resistance(at 20:) Dimensions WOHOD Weight Air direction Sound level (High/Med./Low) Fan speed (High/Med./Low) Fan speed regulator Thermistor RT11(at 25:) Thermistor RT12(at 25:) Remote controller model MS-A30ND K /h A W A(kW) % A 948/762/576 " mm kg dB rpm 45/40/34 1,220/1,020/810 k" k" NOTE:Test conditions are based on ISO 5151 / SSA 385 Cooling : Indoor DB27°C WB19°C / DB29°C WB19°C Outdoor DB35°C WB24°C / DB46°C WB24°C Indoor-Outdoor piping length : 5 / 7.5 m 4 948/834/714 0.37 81 — 100-95 0.37 RC4V40-AA WHT-BLK 138.2 RED-BLK 159.0 1,100O325O258 16 5 45/41/37 1,220/1,100/970 3 10 10 KP0B / KM04B 948/804/660 45/41/37 1,220/1,070/910 06.4.26 6:01 PM OUTLINES AND DIMENSIONS MS-A18ND MS-A24ND MS-A30ND INDOOR UNIT Unit: mm Installation plate Indoor unit 98 7.5 173 98 414.5 414.5 258 325 Air in 791 56 253 Air out Insulation [28 19 162 58 Wireless remote controller 5 { { { Liquid line [ 6.35- 0.5m Gas line [ 12-0.43m Insulation [ 50 O.D 5 [ 32 I.D Installation plate for MS-A18ND Liquid line [ 9.52- 0.5m Gas line [ 12-0.43m Insulation [ 50 O.D [ 32 I.D for MS-A24ND Liquid line [ 9.52- 0.5m Gas line [ 16-0.43m Insulation [ 50 O.D [ 32 I.D for MS-A30ND Drain hose [16 (Connected part O.D) Wall hole [75 1100 173 2.5 47 255.5 1068 315 4 Page 5 47 OB404A--1.qxp OB404A--1.qxp 5 06.4.26 6:01 PM Page 6 WIRING DIAGRAM MS-A18ND MS-A24ND INDOOR UNIT TO OUTDOOR UNIT CONNECTING 220-230V~ HIC1 CN201 2TBWHT F12 BLU BLU N BLU 1 2 4 52C CN 111 RT11 CN 121 NR11 220-230V~ C11 L RT12 3 3 2 1 BLU CN 112 BRN F11 SR141 1 3 4 3 BLK GRY YLW BRN WHT RED MF CN211 GRN/YLW CN 151 CN 102 15 MV2 MV2 MV1 CN 101 ELECTRONIC CONTROL P.C. BOARD 3 3 DISPLAY P.C. BOARD RECEIVER P.C. BOARD REMOTE CONTROLLER SYMBOL NAME NAME FUSE(3.15A) MV2 VERTICAL VANE MOTOR TB TERMINAL BLOCK THERMAL FUSE(93:) NR11 VARISTOR 52C COMPRESSOR CONTACTOR DC/DC CONVERTER RT11 ROOM TEMPERATURE THERMISTOR INDOOR FAN MOTOR(INNER PROTECTOR) RT12 INDOOR COIL THERMISTOR F11 F12 MF SYMBOL HORIZONTAL VANE MOTOR INDOOR FAN CAPACITOR HIC1 NAME SYMBOL MV1 C11 NOTE:1. About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing. 2. Use copper conductors only. (For field wiring) 3. Symbols below indicate. /: Terminal block, : Connector 6 SR141 SOLID STATE RELAY OB404A--1.qxp 06.4.26 6:01 PM Page 7 MS-A30ND INDOOR UNIT TO OUTDOOR UNIT CONNECTING TB 12V 3 N HIC1 3 2 1 BLU CN 151 C11 CN 102 15 F11 CN 101 3 MV2 MV2 MV1 CN 121 NR11 TAB12 BRN RT13 RT12 CN112 CN201 RED GRN/YLW 220-230V~ 2 4 3 2 1 SR141 1 3 4 3 BLK GRY YLW BRN WHT RED CN211 CN ELECTRONIC CONTROL P.C. BOARD 111 RT11 3 DISPLAY P.C. BOARD RECEIVER P.C. BOARD REMOTE CONTROLLER SYMBOL NAME NAME SYMBOL C11 INDOOR FAN CAPACITOR MV2 VERTICAL VANE MOTOR F11 FUSE(3.15A) NR11 VARISTOR DC/DC CONVERTER RT11 ROOM TEMPERATURE THERMISTOR INDOOR FAN MOTOR(INNER PROTECTOR) RT12 MAIN INDOOR COIL THERMISTOR HORIZONTAL VANE MOTOR RT13 SUB INDOOR COIL THERMISTOR HIC1 MF MV1 NOTE:1. About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing. 2. Use copper conductors only. (For field wiring) 3. Symbols below indicate. /: Terminal block, : Connector 7 SYMBOL SR141 TB MF NAME SOLID STATE RELAY TERMINAL BLOCK OB404A--1.qxp 6 06.4.26 6:01 PM Page 8 REFRIGERANT SYSTEM DIAGRAM MS-A18ND Unit : mm INDOOR UNIT Refrigerant pipe [12.7 (with heat insulator) Indoor heat exchanger Main indoor coil thermistor RT12 Flared connection Distributor RT11 Room temperature thermistor Strainer #50 Flared connection Refrigerant pipe [6.35 (with heat insulator) MS-A24ND MS-A30ND INDOOR UNIT INDOOR UNIT Refrigerant pipe [15.88 (with heat insulator) Indoor heat exchanger Main indoor coil thermistor RT12 Refrigerant pipe [15.88 (with heat insulator) Indoor heat exchanger Flared connection Main indoor coil thermistor RT12 Flared connection Sub indoor coil thermistor RT13 Room temperature thermistor RT11 Room temperature thermistor RT11 Strainer #50 Strainer #50 Flared connection Flared connection Refrigerant pipe [6.35 (with heat insulator) Refrigerant pipe [9.52 (with heat insulator) Refrigerant flow in cooling 8 OB404A--1.qxp 06.4.26 6:01 PM 7 Page 9 SERVICE FUNCTIONS MS-A18ND MS-A24ND MS-A30ND 7-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board. The time will be shortened as follows. (Refer to 8-6.) Set time : 1-minute ➔ 1-second Set time : 3-minute ➔ 3-second It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by short circuit of JPG and JPS. 7-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION A maximum of 4 indoor units with wireless remote controllers can be used in a room. In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be modified according to the number of the indoor unit. How to modify the remote controller P.C. board Remove batteries before modification. The board has a print as shown below : Remote controller model : KP0B J2 NOTE : For remodelling, take out the batteries and press the OPERATE/STOP(ON/OFF) button twice or 3 times at first. After finish remodelling, put back the batteries then press the RESET button. J1 Remote controller model : KM04B J1 J2 The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1. After modification, press the RESET button. 9 OB404A--1.qxp 06.4.26 6:01 PM Page 10 Table 1 1 unit operation 2 units operation 3 units operation 4 units operation No. 1 unit No modification Same as at left Same as at left Same as at left No. 2 unit – Solder J1 Same as at left Same as at left No. 3 unit – – Solder J2 Same as at left No. 4 unit – – – Solder both J1 and J2 How to set the remote controller exclusively for particular indoor unit. After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit. The indoor unit will only accepts the signal from the remote controller that has been assigned to the indoor unit once they are set. The setting will be cancelled if the breaker has turned off, or the power supply has shut down. Please conduct the above setting once again after the power has restored. 7-3. AUTO RESTART FUNCTION 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 RESTART FUNCTION” sets to work the moment power has restored after power failure. Then, the unit will restart automatically. However if the unit is operated in “I FEEL CONTROL” mode before power failure, the operation is not memorized. In “I FEEL CONTROL” mode, the operation is decided by the initial room temperature. How to release “AUTO RESTART FUNCTION” 1Turn off the main power for the unit. 2Pull out the indoor electronic control P.C. board and the display P.C. board.(Refer to 9.2.) 3Solder the Jumper wire or the RESISTOR 220" to the RESISTOR JR07 on the indoor electronic control P.C.board. (Refer to 8-6.) C11 SW1 RA102 CN151 CN121 CN111 CN112 CN201 IC101 IC152 JR07 Operation 1If the main power has been cut, the operation settings remain. 2After the power is restored, the unit automatically resumes the same operation as the memory has recorded. However, it takes the compressor at least 3 minutes to get started. NOTE: •The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller. •If the main power is turned off or a power failure occurs while AUTO START/STOP timer is active, the timer setting is cancelled. •If the unit has been off with the remote controller before power failure, the auto restart function does not work as the power button of the remote controller is off. •To prevent breaker off due to the rush of starting current, systematize other home appliances not to turn on at the same time. •When some air conditioners are connected to the same supply system, if they are operated before power failure, the starting current of all the compressors may flow simultaneously at restart. Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current by adding to the system that allows the units to start one by one. 10 OB404A--1.qxp 06.4.26 6:01 PM 8 Page 11 TROUBLESHOOTING MS-A18ND MS-A24ND MS-A30ND 8-1. 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 turn off the unit first with the remote controller, 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. Housing point Lead wiring 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 discolouration. 4) When troubleshooting, refer to 8-2. and 8-3. 4. How to replace batteries Weak batteries may cause the remote controller malfunction. In this case, replace the batteries to operate the remote controller normally. 2 Press the RESET button with tip end of ball point 1 Remove the front lid and insert batteries. pen or the like, and then use the remote controller. Then reattach the front lid. Insert the negative pole of the batteries first. Check if the polarity of the batteries are correct. RESET button NOTE : 1. If the RESET button is not pressed, the remote controller may not operate correctly. 11 OB404A--1.qxp 06.4.26 6:01 PM Page 12 8-2. Instruction of troubleshooting Start Indoor unit operates. Outdoor unit doesn't operate. Outdoor unit operates in only Test Run operation. w Check room temperature thermistor. Refer to 8-6. "Test point diagram and voltage". MS-A30ND Flash on and off at 0.5-second intervals Cause: Indoor/ Outdoor unit • Mis-wiring MU-A30ND Outdoor unit doesn't operate even in Test Run operation.w Refer to "Check of outdoor unit". 2-time flash Cause: Indoor unit • Trouble of room temperature/ indoor coil thermistor Check room temperature Refer to thermistor 8-5. D and indoor "How to coil thermischeck tor. mis-wiring Refer to 8-6. (When "Test point outdoor unit doesn't work)". diagram and voltage". w Indoor unit operates. Outdoor unit doesn't operate normally. MU-A24ND - S2 MU-A30ND Outdoor unit doesn't stop even if indoor unit stop. Refer to "Check of outdoor unit". 3-time flash Cause: Indoor unit • Trouble of indoor fan motor Refer to 8-5. A "Check of indoor fan motor". Indoor unit doesn't receive the signal from remote controller. MU-A30ND Outdoor unit repeats start and stop. Refer to "Check of solenoid valve coil". 4-time flash Cause: Indoor unit • Trouble of indoor control system Indoor unit operates, when EMERGENCY OPERATION switch is pressed. Indoor unit doesn't operate, when EMERGENCY OPERATION switch is pressed. Refer to 8-5. B "Check of remote controller and receiver P.C. board". 1. Check indoor / outdoor connecting wire. 2. Check of outdoor fuse. (MU-A18/A24ND) 3. Refer to 8-5. C "Check of indoor electronic control P.C. board". MU-A30ND 6-time flash Cause: Outdoor unit • Trouble of thermistor in outdoor unit Replace the indoor electronic control P.C. board. OPERATION INDICATOR lamp on the indoor unit is flashing on and off. Refer to "Check of outdoor thermistor". MU-A30ND 7-time flash Cause: Outdoor unit • Trouble of outdoor control system Replace the deicer P.C. board. MU-A30ND 10-time flash Cause: Outdoor unit • Trouble of low discharge temperature protection Refer to "Check of LEV". Refer to outdoor unit service manual. "Test Run operation" means the operation within 30 minutes after EMERGENCY OPERATION switch is pressed. 12 OB404A--1.qxp 06.4.26 6:01 PM Page 13 8-3. Troubleshooting check table • The following indication applies regardless of shape of the indicator. · Flashing of the OPERATION INDICATOR lamp (the left-hand side lamp) indicates possible abnormalities. · The OPERATION INDICATOR lamp (the left-hand side lamp) is lighting during Not lighted normal operation. Operation Indicator Lighted Before taking measures, make sure that the symptom reappears for accurate troubleshooting. Self check table No. Abnormal point Indication Symptom 0.5-second ON 1 Outdoor unit does not operate. Mis-Wiring Detection method Check point 3 minutes after power supply turns ON, when serial signal is not received. • Refer to 8-5. D "How to check mis-wiring ". Detect Indoor coil/room temperature thermistor short or open circuit every 8 seconds during operation. • Refer to the characteristics of indoor coil thermistor, sub indoor coil thermistor, and room temperature thermistor on 8-6. 0.5-second OFF Indoor coil thermistor 2-time flash Outdoor unit does not operate. 2 Room temperature thermistor 2.5-second OFF Indoor fan motor repeats 12 seconds ON and 3 minutes OFF. When the indoor fan motor breaks, the fan keeps stopping. 3-time flash 3 Indoor fan motor. 2.5-second OFF 4-time flash 4 Indoor control system 2.5-second OFF Outdoor unit does not operate. 6-time flash 5 Outdoor thermistors MU-A30ND Outdoor unit does not operate. 2.5-second OFF 6 Outdoor control system MU-A30ND 7-time flash Outdoor unit does not operate. When rotational frequency feedback signal is not emitting during 12-second indoor fan operation. When nonvolatile memory data cannot be read properly on indoor electronic control P.C. board. • Refer to 8-5. A "Check of indoor fan motor". • Replace the indoor electronic control P.C. board. <Thermistor short> Thermistors are abnormal when they short after compressor start-up. <Thermistor open> Thermistors are abnormal when they open after compressor start-up. However, discharge temperature thermistor is abnormal when open circuit is detected more than 10 minutes after compressor start-up. • Shortage of refrigerant • Replace the deicer P.C. board. Refer to "Check of outdoor thermistor". Refer to outdoor unit service manual. When nonvolatile memory data cannot be read properly on deicer P.C. board. • Replace the deicer P.C. board. Refer to outdoor unit service manual. 2.5-second OFF When discharge temperature has been 50: or less for 20 minutes. 10-time flash Low discharge 7 temperature protection MU-A30ND Outdoor unit does not operate. • Refer to "Check of LEV". • Check refrigerant circuit and refrigerant amount. Refer to outdoor unit service manual. 2.5-second OFF NOTE : When the indoor unit has started operation and the above detection method has detected an abnormality (the first detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with the OPERATION INDICATOR lamp flashing. 13 OB404A--1.qxp 06.4.26 6:01 PM Page 14 8-4. Trouble criterion of main parts MS-A18ND MS-A24ND MS-A30ND INNER PROTECTOR 135i 5: OPEN 86i15: CLOSE Horizontal vane motor(MV1) Vertical vane motor(MV2) Motor part Measure the resistance with a tester. (Part temperature 10°C ~ 30°C) Refer to 8-6. “Test point diagram and voltage”, “Indoor electronic control P.C. board”, the chart of thermistor. Measure the resistance between the terminals with a tester. (Coil wiring temperature10°C ~ 30°C) Color of lead wire Normal WHT - BLK BLK - RED 132 ~ 144 " 152 ~ 166 " MAIN AUX. Measure the voltage Power ON. Sensor part Indoor fan motor (MF) Figure Check method and criterion Part name Room temperature thermistor (RT11) Indoor coil thermistor (RT12(main), RT13(sub)) Color of lead wire Normal BRN - YLW 4.5 ~ 5.5 V YLW - GRY (When fan revolved one time) 0V➔5V➔0V (Approx.) Measure the resistance between the RED terminals and other ones. (Winding temperature10°C ~ 30°C) BLK PNK REDWHT ROTOR ORN RED Normal 282 ~ 306 " YLW BLU P:INNER PROTECTOR 14 OB404A--1.qxp 06.4.26 6:01 PM Page 15 8-5. Troubleshooting flow When OPERATION INDICATOR lamp flashes 3-time. Indoor fan motor doesn’t operate. A Check of indoor fan motor Turn OFF the power supply. Check connector CN211 visually. No Yes Are lead wires connected? Is soldered point of the connector correctly soldered? No Yes Resolder it. Reconnect the lead wires. Disconnect lead wires from connector CN211 on the indoor electronic control P.C. board. Measure resistance between lead wires No.1 and No.4 and then No.3 and No.4. Is resistance 0 (short circuit) or ∞ (open circuit)? Yes ( 0 or ∞ ) Repair the indoor fan motor. No (others) No Turn ON the power supply. Stop it if the unit operate. Insert screwdriver into air outlet to rotate indoor fan motor slowly for 1 revolution or over, and measure voltage No.2(+) and No.3(-) on CN121. Does voltage repeat 0V DC and 5V DC? Yes Replace the indoor electronic control P.C. board. Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn’t operate with the remote controller. B Check of remote controller and receiver P.C. board w Check if the remote controller is exclusive for this air conditioner. Switch on the remote controller. Is LCD display on the remote controller visible? No (not clear) Replace the batteries. (Refer to 8-1.4.) Yes Remove batteries, then set them back and press the RESET button. Check if the unit operates with remote controller. Does the unit operate with remote controller? No Turn on a radio to AM and press switch on the remote controller. Yes OK Is noise heard from radio? No Replace the remote controller. Yes Are there any fluorescent lights of inverter or rapid-start type within the range of 1m? Yes ● Reinstall the unit away from lights. ● Attach a filter on receiving part. No Measure the voltage between receiver P.C. board connector CN301 No.1(+) and No.3(-) when the remote controller button is pressed. Is the voltage approx. 4V DC? No(5V or 0V DC) Replace the receiver P.C. board. 15 Yes Replace the indoor electronic control P.C. board OB404A--1.qxp 06.4.26 6:01 PM Page 16 The unit doesn’t operate with the remote controller. Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch. C Check of indoor electronic control P.C. board Check both “parts side” and “pattern side” of the indoor electronic control P.C. board visually. 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. Does the unit operate with the remote controller? No Does the OPERATION INDICATOR lamp light up by pressing the EMERGENCY OPERATION switch? Yes Turn OFF the power supply. Varistor (NR11) Indoor electronic control P.C. board Turn OFF the power supply. Replace the vane motor. Yes Is the winding resistance of vane motor 0 "? Fuse (F11) Replace the fuse. No Is the winding resistance of fan motor 0 "? Yes Replace the fan motor. Is fuse(F11) blown? MS-A30ND No Is varistor(NR11) burnt? Yes Replace the varistor. 16 F12 1 2 Indoor electronic control P.C. board No Yes 3 2 1 CN201 Terminal block 2 N L No MS-A18/A24ND Measure the resistance between CN201 1 on the indoor electronic control P.C. board and N on the terminal block with a tester. Replace the indoor electronic control P.C. board. Yes Is resistance approx. 0"? No (∞) Replace the fuse (F12). OB404A--1.qxp 06.4.26 6:01 PM Page 17 When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit doesn’t operate. D How to check mis-wiring MS-A30ND w Short circuit of JPG and JPS on the indoor electronic control P.C. board enables self-check to be displayed in 3 seconds. Start • Turn ON the power supply. • Press EMERGENCY OPERATION switch once. When the unit has mis-wiring, in 3 minutes, OPERATION INDICATOR lamp on indoor unit flash on and off at 0.5 second intervals. w Yes Make them sure. Is this mis-wiring, poor contact, or wire disconnection? No 1. Turn OFF the power supply and disconnect only terminal block 3 of indoor/ outdoor connecting wire on indoor side. 2. Short-circuit terminal block N-3 by lead wire. 3. Turn ON the power supply and press EMERGENCY OPERATION switch once. Is there 1V DC detected between both ends of PS132 on the indoor electronic control P.C. board ? However, the stylus of a tester would be between 0 and 20V. Yes No Replace the indoor electronic control P.C. board. • Turn OFF the power supply. • Disconnect the lead wire that terminal block N-3 is short-circuited. • Connect ON indoor/ outdoor connecting wire. Turn ON the power supply. Is there 220-230V AC between L-N on the outdoor terminal block? No Check the outdoor power supply and connection of wiring. Yes Is there 5V DC between J101 + -J401 - ? No Replace the deicer P.C. board. Yes When EMERGENCY OPERATION is operated, is there 10V DC between both ends of R601 on the deicer P.C. board? However the stylus of a tester would be between 5 ~10V. No Yes Replace the deicer P.C. board. Refer to outdoor unit service manual. 17 Make the wiring between CN730 on the deicer P.C. board and outdoor terminal block correct. OB404A--1.qxp 06.4.26 6:01 PM Page 18 8-6. Test point diagram and voltage MS-A18ND MS-A24ND MS-A30ND Indoor electronic control P.C.board Varistor (NR11) Fan motor power supply 220-230V AC(CN211) } Power supply input 220-230V AC + Fuse (F11) 250V AC 3.15A } 5V DC Room temperature thermistor(RT11) Main indoor coil thermistor(RT12) PS132 MS-A30ND CN121 MS-A30ND Sub indoor coil thermistor(RT13) Vane motor power supply (CN151) Emergency operation switch Timer short mode point (JPS, JPG) (Refer to 7-1.) + } 12V DC CN301 Release of Auto restart function Solder the Jumper wire or the Resistor 220" to the Resistor JR07. (Refer to 7-3.) Resistance (k") Main indoor coil thermistor (RT12) Sub indoor coil thermistor (RT13) Room temperature thermistor (RT11) Temperature (:) 18 OB404A--1.qxp 9 06.4.26 6:01 PM Page 19 DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. (1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the locking mechanism. Sleeve Locking lever 1Slide the sleeve. 2Pull the terminal while pushing the locking lever. 1Hold the sleeve, and pull out the terminal slowly. Connector MS-A18ND MS-A24ND MS-A30ND INDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the front panel (1) Remove the screws caps of the front panel. Remove the screws. (2) Pull the panel down to your side slightly and unhook the catches at the top. 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 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 lead wires on the electronic control P.C. board. (7) Remove the R.L holder. (8) Remove the electronic control P.C. board. (9) Open the R.L holder, remove the receiver P.C. board and the display P.C. board. Photo 2 Screws of the ground wire Fan motor connectors Vane motor connector Indoor electronic control P.C.board Screw of the electrical cover Screw of the terminal block 19 R.L holder Receiver Screw of the V.A. clamp P.C. board OB404A--1.qxp 06.4.26 6:01 PM Page 20 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box (1) Remove the front panel. (Refer to 1.) (2) Remove the electrical cover. (Refer to 2.) (3) Disconnect the connector of the indoor coil thermistor. (4) Disconnect the motor connector (CN211 and CN121) and the vane motor connector (CN151) on the electronic control P.C. board. (5) Remove the screw of ground wire. (6) Remove the fan motor lead wire and indoor coil thermistor from the electrical box. (7) Remove the lead wire of vane motor from the bottom of electrical box. (8) Remove the screw fixing the electrical box, remove the electrical box. Photo 3 4. Removing the vane motor (1) Remove the front panel. (Refer to 1.) (2) Remove the electrical cover. (Refer to 2.) (3) Remove the lead wire of vane motor.(Refer to 3.) (4) Remove the R.L. holder. (5) Pull out the drain hose from the nozzle assembly, remove the nozzle assembly. (6) Remove the screws of the vane motor, disconnect the connector. (7) Remove the vane motor. Photo 4 Screws of the ground wire Screw of the electrical cover Screw of the electrical box Vane motors Photo 5 Screws of the vane motor Vane 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) Slide the hole cover, remove the hole cover. (6) Remove the hexagon socket set screw from the line flow fan. (7) Remove the fan motor after removing screws, which fasten the motor, but be careful not to drop it because of its heavy weight. (8) Remove the screws fixing the left side of the heat exchanger. (9) Lifting the left side of the heat exchanger. (10) Remove the line flow fan. Photo 6 Screws fixing the left side of the heat exchanger Photo 7 Indoor coil thermistor Photo 8 Water cut Hole cover Screws fixing the fan motor 20 Screws of the vane motor OB404A--1.qxp 06.4.26 6:01 PM 10 Page 21 PARTS LIST (non-RoHS compliant) MS-A18ND MS-A24ND MS-A30ND 10-1. INDOOR UNIT STRUCTURAL PARTS 10-2. INDOOR UNIT HEAT EXCHANGER 1 2 11 3 4 CATCH 9 (See 10-5.) 7 5 SCREW CAP 12 13 6 8 10-1. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. No. 1 2 3 4 5 6 7 8 9 10 Part No. E02 E02 E02 E02 E02 E02 E02 E02 527 685 888 408 685 888 685 534 970 234 000 142 067 010 975 100 E02 888 007 Part name Q'ty/unit Symbol in Wiring MS-A18 MS-A24 MS-A30 Diagram ND- S1 ND- S1 ND- S1 1 1 1 4 3 1 1 2 2 1 INSTALLATION PLATE BOX FRONT PANEL ASSEMBLY CATCH SCREW CAP GRILLE CORNER BOX RIGHT CATECHIN AIR FILTER AIR CLEANING FILTER LAMP PANEL 1 1 1 4 3 1 1 2 2 1 1 1 1 4 3 1 1 2 2 1 Remarks Including No.4,5,6 4PCS/SET 3PCS/SET 1PCE/SET MAC-1700FT 10-2. INDOOR UNIT HEAT EXCHANGER 11 12 13 E02 E02 E02 E02 E02 E02 E02 E02 817 947 890 179 138 A16 151 527 620 620 620 667 666 666 667 667 INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER UNION(GAS) UNION(GAS) UNION(GAS) UNION(LIQUID) UNION(LIQUID) 1 1 1 1 1 1 1 1 1 21 {12.7 {15.88 {15.88 {6.35 {9.52 Price OB404A--1.qxp 06.4.26 6:01 PM Page 22 PARTS LIST (non-RoHS compliant) MS-A18ND MS-A24ND MS-A30ND 10-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS 20 1 10-4. ACCESSORY AND REMOTE CONTROLLER 19 24 2 25 3 SLEEVE BEARING 4 12 17 11 ROOM TEMPERATURE THERMISTOR 5 6 13 18 10 7 FUSE 8 9 VARISTOR 14 15 16 10-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Part No. E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 527 408 001 408 996 685 685 A49 817 527 527 448 408 528 527 949 950 951 527 527 888 814 408 947 527 528 529 408 302 509 504 702 235 040 041 382 385 034 300 303 303 329 468 452 452 452 308 333 375 375 311 311 311 034 034 381 Part name Q'ty/unit Symbol in Wiring MS-A18 MS-A24 MS-A30 ND- S1 ND- S1 Diagram ND- S1 LINE FLOW FAN BEARING MOUNT SLEEVE BEARING DRAIN HOSE NOZZLE VANE UPPER VANE LOWER F11 FUSE NR11 VARISTOR VANE CRANK SET MF INDOOR FAN MOTOR ASSEMBLY MV2 VERTICAL VANE MOTOR MV1 HORIZONTAL VANE MOTOR DISPLAY P.C. BOARD RECEIVER P.C. BOARD ELECTRONIC CONTROL P.C. BOARD ELECTRONIC CONTROL P.C. BOARD ELECTRONIC CONTROL P.C. BOARD ROOM TEMPERATURE THERMISTOR RT11 MOTOR BAND TB TERMINAL BLOCK TB TERMINAL BLOCK RT12 INDOOR COIL THERMISTOR RT12 INDOOR COIL THERMISTOR RT12, RT13 INDOOR COIL THERMISTOR VANE MOTOR SUPPORT SET (RIGHT) VANE MOTOR SUPPORT SET (LEFT) F12 THERMAL FUSE 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 Remarks 3.15A RC4V40Including RUBBER MOUNT RIGHT&LEFT UP&DOWN AUTO RESTART Including No.15 AUTO RESTART Including No.15 AUTO RESTART Including No.15 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 10-4. ACCESSORY AND REMOTE CONTROLLER 24 25 E02 527 426 E02 527 083 REMOTE CONTROLLER REMOTE CONTROLLER HOLDER 22 1 1 KM04B Price OB404A--1.qxp 06.4.26 6:01 PM Page 23 PARTS LIST (non-RoHS compliant) 10-5. AIR CLEANING FILTER ● AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity. ● Normal life of AIR CLEANING FILTER is 4 months. However, when it becomes dirty, replace it as soon as possible. ● Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. ● DO NOT reuse AIR CLEANING FILTER even if it is washed. ● DO NOT remove or attach AIR CLEANING FILTER during unit operation. Part No. Model MS-A18ND MS-A24ND MS-A30ND - S1 S1 MAC-1700FT S1 Air cleaning filter (White bellows type) 23 OB404A--1.qxp 11 06.4.26 6:01 PM Page 24 RoHS PARTS LIST (RoHS compliant) MS-A18ND MS-A24ND MS-A30ND 11-1. INDOOR UNIT STRUCTURAL PARTS 11-2. INDOOR UNIT HEAT EXCHANGER 1 2 11 3 4 CATCH 9 (See 11-5.) 7 5 SCREW CAP 12 13 6 8 11-1. INDOOR UNIT STRUCTURAL PARTS No. RoHS Part number that is circled is not shown in the illustration. 1 2 3 4 5 6 7 8 9 10 G G G G G G G G G G Part No. E12 E12 E12 E12 E12 E12 E12 E12 527 685 888 408 685 888 685 534 970 234 000 142 067 010 975 100 E12 888 007 Part name Q'ty/unit Symbol in Wiring MS-A18 MS-A24 MS-A30 Diagram ND- S1 ND- S1 ND- S1 1 1 1 4 3 1 1 2 2 1 INSTALLATION PLATE BOX FRONT PANEL ASSEMBLY CATCH SCREW CAP GRILLE CORNER BOX RIGHT CATECHIN AIR FILTER AIR CLEANING FILTER LAMP PANEL 1 1 1 4 3 1 1 2 2 1 1 1 1 4 3 1 1 2 2 1 Remarks Including No.4,5,6 4PCS/SET 3PCS/SET 1PCE/SET MAC-1700FT 11-2. INDOOR UNIT HEAT EXCHANGER G E12 817 620 11 G E12 947 620 G E12 890 620 G E12 179 667 12 G E12 138 666 G E12 A16 666 G E12 151 667 13 G E12 527 667 INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER UNION(GAS) UNION(GAS) UNION(GAS) UNION(LIQUID) UNION(LIQUID) 1 1 1 1 1 1 1 1 1 24 {12.7 {15.88 {15.88 {6.35 {9.52 Price OB404A--1.qxp 06.4.26 6:01 PM Page 25 RoHS PARTS LIST (RoHS compliant) MS-A18ND MS-A24ND MS-A30ND 11-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS 20 1 11-4. ACCESSORY AND REMOTE CONTROLLER 19 24 2 25 3 SLEEVE BEARING 4 12 17 11 ROOM TEMPERATURE THERMISTOR 5 6 13 18 10 7 FUSE 8 9 VARISTOR 14 15 16 11-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 RoHS Part numbers that are circled are not shown in the illustration. G G G G G G G G G G G G G G G G G G G G G G G G G G G G Part No. E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 E12 527 408 001 408 996 685 685 A49 817 527 527 448 408 528 527 949 950 951 527 527 888 814 408 947 527 528 529 408 302 509 504 702 235 040 041 382 385 034 300 303 303 329 468 452 452 452 308 333 375 375 311 311 311 034 034 381 Part name Q'ty/unit Symbol in Wiring MS-A18 MS-A24 MS-A30 ND- S1 ND- S1 Diagram ND- S1 LINE FLOW FAN BEARING MOUNT SLEEVE BEARING DRAIN HOSE NOZZLE VANE UPPER VANE LOWER F11 FUSE NR11 VARISTOR VANE CRANK SET MF INDOOR FAN MOTOR ASSEMBLY MV2 VERTICAL VANE MOTOR MV1 HORIZONTAL VANE MOTOR DISPLAY P.C. BOARD RECEIVER P.C. BOARD ELECTRONIC CONTROL P.C. BOARD ELECTRONIC CONTROL P.C. BOARD ELECTRONIC CONTROL P.C. BOARD RT11 ROOM TEMPERATURE THERMISTOR MOTOR BAND TB TERMINAL BLOCK TB TERMINAL BLOCK RT12 INDOOR COIL THERMISTOR RT12 INDOOR COIL THERMISTOR INDOOR COIL THERMISTOR RT12, RT13 VANE MOTOR SUPPORT SET (RIGHT) VANE MOTOR SUPPORT SET (LEFT) F12 THERMAL FUSE 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 Remarks 3.15A RC4V40Including RUBBER MOUNT RIGHT&LEFT UP&DOWN AUTO RESTART Including No.15 AUTO RESTART Including No.15 AUTO RESTART Including No.15 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 11-4. ACCESSORY AND REMOTE CONTROLLER 24 G 25 G E12 527 426 E12 527 083 REMOTE CONTROLLER REMOTE CONTROLLER HOLDER 25 1 1 KM04B Price OB404A--1.qxp 06.4.26 6:01 PM Page 26 RoHS PARTS LIST (RoHS compliant) 11-5. AIR CLEANING FILTER ● AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity. ● Normal life of AIR CLEANING FILTER is 4 months. However, when it becomes dirty, replace it as soon as possible. ● Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. ● DO NOT reuse AIR CLEANING FILTER even if it is washed. ● DO NOT remove or attach AIR CLEANING FILTER during unit operation. Part No. Model MS-A18ND MS-A24ND MS-A30ND - S1 S1 MAC-1700FT S1 Air cleaning filter (White bellows type) 26 OB404A--1.qxp 06.4.26 6:01 PM Page 27 27 OB404A--1.qxp 06.4.26 6:01 PM Page 28 TM HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in May 2006. No.OB404 REVISED EDITION-A 106 Reprinted in Apr. 2005. No.OB404 100 Distributed in Mar. 2005. No.OB404 6 Made in Japan New publication, effective May 2006 Specifications subject to change without notice.