Mitsubishi Electric M-SERIES, Service Manual

Page 1: ...SERVICE MANUAL Model name Indoor unit Model name Indoor unit Series MVZ MVZ A12AA4 MVZ A18AA4 MVZ A24AA4 Air Conditioners M SERIES MVZ A12 18 24 30 36AA7 Multi Position Air Handler INDOOR UNIT ...

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Page 3: ...9 9 2 Fan control 21 9 3 CN24RELAY KIT CM3 Optional Parts installation 22 10 HUMIDIFIER CONTROL 24 RQWURO 6SHFL FDWLRQV 24 10 2 Installation 24 11 ERV ENERGY RECOVERY VENTILATION CONTROL 25 RQWURO 6SHFL FDWLRQV 25 12 TROUBLESHOOTING 26 12 1 Cautions on troubleshooting 26 12 2 Self check function 27 12 3 Self diagnosis action table 29 12 4 Troubleshooting by inferior phenomena 33 12 5 Test point di...

Page 4: ... refrigerant Handle tools with care If dirt dust or moisture enters into refrigerant cycle that can cause deterioration of refrigerant oil or malfunction of com pressor Do not use a charging cylinder If a charging cylinder is used the composition of refrigera nt will change and the efficiency will be lowered Flare tool Electronic refrigerant charging scale Vacuum pump adaptor Size adjustment gauge...

Page 5: ...2 Use high tension side pressure of 5 3MPa G or over 2 Charge hose Only for R410A Use pressure performance of 5 09MPa G or over 3 Electronic scale 4 Gas leak detector Use the detector for R134a R407C or R410A 5 Adaptor for reverse flow check Attach on vacuum pump 6 Refrigerant charge base 7 Refrigerant cylinder Only for R410A Top of cylinder Pink Cylinder with syphon 8 Refrigerant recovery equipme...

Page 6: ... controller built in 24 28 32 27 31 35 32 36 41 19 05 3 4 FPT 432 17 548 21 5 8 1275 50 1 4 51 113 Service Ref Power supply phase cycle voltage Max Fuse Size Min Circuit Ampacity A A kW F L A m3 min CFM Pa in WG Sound pressure level Low Mid High dB A Drain pipe mm in Dimensions W mm in D mm in H mm in kg lbs INDOOR UNIT Weight 75Pa 0 30 in WG 125Pa 0 50 in WG 200Pa 0 80 in WG 1 phase 60Hz 208 230V...

Page 7: ...External static pressure Operation control Thermostat External finish Heat exchanger Fan Fan drive x No Fan motor output Fan motor Airflow Low Mid High External static pressure Operation control Thermostat External finish Heat exchanger Fan Fan drive x No Fan motor output Fan motor Airflow Low Mid High External static pressure Operation control Thermostat MVZ A24AA7 1 phase 60Hz 208 230V 15 3 00 Galva...

Page 8: ...sure Pa in WG 25 0 10 50 0 20 100 0 40 75 0 30 125 0 50 150 0 60 Airflow rate m3 min cfm Static pressure Pa in WG 75 0 30 100 0 40 150 0 60 125 0 50 175 0 70 200 0 80 225 0 90 Airflow rate m3 min cfm Static pressure Pa in WG Low Low Low Middle Middle Middle High High High Low Low Low Middle Middle Middle High High High MVZ A12AA4 Vertical Horizontal Right Horizontal Left Downflow External static p...

Page 9: ... m3 min cfm Static pressure Pa in WG 25 0 10 50 0 20 100 0 40 75 0 30 125 0 50 150 0 60 Airflow rate m3 min cfm Static pressure Pa in WG 75 0 30 100 0 40 150 0 60 125 0 50 175 0 70 200 0 80 225 0 90 Airflow rate m3 min cfm Static pressure Pa in WG Low Low Low Middle Middle Middle High High High Low Low Low Middle Middle Middle High High High MVZ A18AA4 Vertical Horizontal Right Horizontal Left Dow...

Page 10: ...100 0 40 Airflow rate m3 min cfm Static pressure Pa in WG 25 0 10 50 0 20 100 0 40 75 0 30 125 0 50 150 0 60 Airflow rate m3 min cfm Static pressure Pa in WG 75 0 30 100 0 40 150 0 60 125 0 50 175 0 70 200 0 80 225 0 90 Airflow rate m3 min cfm Static pressure Pa in WG Low Low Low Middle Middle Middle High High High Low Low Low Middle Middle Middle High High High MVZ A24AA4 Vertical Horizontal Righ...

Page 11: ...ure Pa in WG 25 0 10 50 0 20 100 0 40 75 0 30 125 0 50 150 0 60 Airflow rate m3 min cfm Static pressure Pa in WG 25 0 10 50 0 20 100 0 40 75 0 30 125 0 50 150 0 60 75 0 30 100 0 40 150 0 60 125 0 50 175 0 70 200 0 80 225 0 90 Airflow rate m3 min cfm Static pressure Pa in WG Low Low Low Middle Middle Middle High High High Low Low Low Middle Middle Middle High High High MVZ A30AA4 Vertical Horizonta...

Page 12: ...WG 25 0 10 50 0 20 100 0 40 75 0 30 125 0 50 175 0 70 150 0 60 Airflow rate m3 min cfm Static pressure Pa in WG 19 671 25 883 20 706 32 1130 30 1059 0 0 25 0 10 75 0 30 50 0 20 100 0 40 125 0 50 50 0 20 75 0 30 125 0 50 100 0 40 150 0 60 175 0 70 200 0 80 Airflow rate m3 min cfm Static pressure Pa in WG Low Low Low Middle Middle Middle High High High Low Low Low Middle Middle Middle High High High...

Page 13: ... US Inc 11 Airflow rate m3 min cfm External static pressure Pa in WG 0 0 10 353 20 706 30 1059 40 1412 50 1766 MVZ A12 18 24 30 36AA4 0 0 5 0 020 10 0 040 15 0 060 20 0 080 25 0 100 Power source 208 230V 60Hz Air filter A12 18 24 A12 18 24 A30 36 A30 36 MVZ A12 18 24 30 36AA7 ...

Page 14: ...6SHFL FDWLRQV DUH VXEMHFW WR FKDQJH ZLWKRXW QRWLFH 2016 Mitsubishi Electric US Inc 12 SOUND PRESSURE LEVELS 5 5 1 Sound pressure level Multi Position 5 2 NC curves MVZ A12AA7 MVZ A18AA7 ...

Page 15: ...6SHFL FDWLRQV DUH VXEMHFW WR FKDQJH ZLWKRXW QRWLFH 2016 Mitsubishi Electric US Inc 13 MVZ A24AA7 MVZ A30AA7 ...

Page 16: ...6SHFL FDWLRQV DUH VXEMHFW WR FKDQJH ZLWKRXW QRWLFH 2016 Mitsubishi Electric US Inc 14 MVZ A36AA7 ...

Page 17: ... Hole ø26 Knockout Hole Indoor Outdoor unit connection Indoor Outdoor unit connection Remote controller transmission Unit mm in Model A B C D E F G H J Gas pipe Liquid pipe MVZ A12AA7 432 17 376 14 13 16 281 11 1 8 224 8 7 8 1275 50 1 4 680 26 13 16 823 32 7 16 735 5 29 360 14 3 16 ø 12 7 1 2 ø 6 35 1 4 MVZ A18AA7 MVZ A24AA7 ø 15 88 5 8 ø 9 52 3 8 MVZ A30AA7 534 21 477 18 13 16 382 6 15 1 8 266 5 ...

Page 18: ...RQV DUH VXEMHFW WR FKDQJH ZLWKRXW QRWLFH 2016 Mitsubishi Electric US Inc 16 609 6 24 Width of Unit 609 6 24 Length of Unit Clearance Area Vertical Installation Horizontal Installation Unit mm in 609 6 24 609 6 24 ...

Page 19: ...TRANSMISSION LINE TB6 WIRED REMOTE CONTROLLER BOARD R B SW2 SWITCH COOLING ON OFF SWITCH HEATING ON OFF SW1 IR WIRELESS REMOTE CONTROLLER BOARD LED RUN INDICATOR BUZZER OPTIONAL PARTS LED1 BZ1 RECEIVING UNIT RU W B CN24 1 CN24 2 CONNECTOR HEATER CONTROL 2ND CONNECTOR 0 10V ANALOG INPUT CN25 CONNECTOR HUMIDITY OUTPUT CN2C CONNECTOR ERV OUTPUT CONNECTOR ERV INPUT CNER CNF CONNECTOR HUMIDITY INPUT ON...

Page 20: ...18 24 30 36AA7 Thermistor TH2 Pipe temperature Liquid Distributor with strainer 50 Thermistor TH5 Cond Eva temperature Thermistor TH1 Room temperature Refrigerant flow in cooling Refrigerant flow in heating Strainer 50 Strainer 50 Heat exchanger Refrigerant GAS pipe connection Flare Refrigerant LIQUID pipe connection Flare ...

Page 21: ...sable heater during Defrost and Error 2 2 ņ Heater Available ON ON High Enable heater and fan during Defrost and Error 1 1 Heater will not operate during all error modes Heater will only operate during a communication error between indoor unit and outdoor unit Table 2 shows how the field installed heater is controlled Table 2 Heater Control Table Mode Change Condition To TRA 2 7 F 1 5 C AND TRA ha...

Page 22: ...A controller can be attached and used 2 The default time delay setting is 24 minutes 3 All delay times are approximate Chart 1 and Table 4 show an example of heater operation Chart 1 Heater Operation Example EH2 ON OFF To 0 9 F 0 5 C To 2 7 F 1 5 C ON OFF EH1 To TRA X min X min X min 7 min 5 Table 4 Heater Operation Example Step Condition Result To TRA 2 7 F 1 5 C AND TRA has not increased by 0 9 ...

Page 23: ...n settings By setting the Mode No 23 in the Function Table in section 9 1 and using CN4Y from the CN24RELAY KIT CM3 kit the following patters of fan control will become possible Fan Control Patterns CN4Y for FAN control CN24RELAY KIT CM3 Mode function No 23 123 Heater operation in defrost and error 1 Fan operation in defrost and error Fan All modes other than defrost and error Factory Setting Enab...

Page 24: ... 2 Connection to the indoor unit Use the cables that fit the connectors on the indoor unit control board 1 External output cable This cable is used to connect a relay circuit for an interlocked operation with either an electric or a panel heater Select the heater output pattern 1st CN24 1 or 2nd CN24 2 to use and connect the cable to the connector on the indoor unit control board that corresponds t...

Page 25: ...n 10 meters 32ft could cause improper operation Use a transit relay when extending wiring such as remote wiring Recommended circuit Wiring diagram 1 phase power supply 208V 230V 60Hz Control board FS1 2 Thermal fuse H1 H2 Heater 26H Overheat protection thermostat 88H Electromagnetic contactor FS1 FS2 FS1 FS2 R S R S CN24 1 or CN24 2 H2 88H H1 88H 26H 88H 23 3 Wiring A basic connection method is sh...

Page 26: ... Heat operation Thermo OFF OFF RC setting Heat operation Thermo ON ON Heat operation Thermo OFF ON High Heat operation Thermo ON Except for heat operation OFF RC setting RC Remote controller The fan continues to run for 30 seconds after the humidifier stops A basic connection method is shown below CNF CN25 Humidistat XA SVA Humidifier XA Indoor unit control board On site preparation Maximum cable ...

Page 27: ...VDC Power consumption 1W or less ERV switch Minimum applicable load 1mA at DC Contact rating voltage 15VDC or more Contact rating current 0 1A or more 11 1 Control Specifications 11 2 INSTALLATION ERV ENERGY RECOVERY VENTILATION CONTROL The below table shows how the field installed E R V is controlled E R V output Condition Fan speed CN2C output Fan output CNE R input OFF Cool Heat Fan operation R...

Page 28: ...ecting wire for mis wiring 2 Take care the followings during servicing 1 Before servicing the air conditioner be sure to turn off the remote controller first to stop the main unit and then turn off the breaker 2 When removing the indoor controller board hold the edge of the board with care NOT to apply stress on the components 3 When connecting or disconnecting the connectors hold the housing of t...

Page 29: ...mal temperature of heat sink Outdoor unit fan protection stop Compressor overcurrent interruption Abnormal of power module Abnormality of super heat due to low discharge temperature Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit Current sensor error Other errors Refer to the technical manual for the outdoor unit For details check the LED display...

Page 30: ... microcomputer LED 2 power for remote controller LED 3 communication between indoor and outdoor units AUTO RESTART FUNCTION Indoor controller board This model is equipped with the 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 controller board The auto restart function sets to work...

Page 31: ...or is detected Abnormal if the unit does not reset normally after three minutes The unit returns to normal operation if it has normally reset 2 Constantly detected during cooling drying and heating except defrosting operation 6KRUW Û Û RU PRUH 2SHQ Û Û RU OHVV 1 Defective thermistor characteristics 2 Contact failure of connector CN44 on the indoor controller board Insert failure 3 Breaking of wire...

Page 32: ...th 3 Over load high temperature operation beyond the tolerance range 4 Defective indoor fan motor Fan motor is defective Indoor controller board is defective 5 Defective outdoor fan control 6 Overcharge of refrigerant 7 Defective refrigerant circuit clogs 8 Bypass circuit of outdoor unit is defective Cooling or drying mode 1 Check clogging of the filter 2 Remove shields 4 Refer to 12 8 DC Fan moto...

Page 33: ...ting remote control ler max 2units When it is not the above mentioned problem of 1 3 4 Diagnose remote controllers a When RC OK is displayed Remote controllers have no problem Turn the power off and on again to check If abnormality generates again replace indoor controller board b When RC NG is displayed Replace remote controller c When RC E3 is displayed d When ERC 00 06 is displayed c d oNoise m...

Page 34: ...ler board 2 Noise has entered into power supply 3 Noise has entered into outdoor control wire 1 3 Turn the power off and on again to check If abnormality generates again replace indoor controller board Indoor outdoor unit communication error Signal receiving error 1 Abnormal if indoor controller board cannot receive any signal normally for six minutes after turning the power on 2 Abnormal if indoo...

Page 35: ...f no problem are found indoor controller board is defective 2 LED2 on indoor controller board is blinking When LED1 on indoor controller board is also blinking Connection failure of indoor outdoor unit connecting wire When LED1 is lit 1 Mis wiring of remote controller wires Under twin triple indoor unit system 2 or more indoor units are wired together 2 Refrigerant address for outdoor unit is wron...

Page 36: ...t to the indoor power board CNXB2 Connect to the indoor power board CNXC2 Connect to the indoor power board 1 VFG Voltage on the side of PC51 and C25 Same with the voltage between 7 and 4 of CNMF VCC Voltage between the C25 pins 15 VDC Same with the voltage between 5 and 4 of CNMF Vsp Voltage between the C53 pins 0VDC with the fan stopped 1 6 5VDC with the fan in operation Same with the voltage be...

Page 37: ...ontrol 12VDC CN24 2 2nd Heater control CN4Y For fan control CN3C Indoor outdoor transmission 0 24VDC CN90 Wireless remote controller CNXA2 Connect to the indoor controller board CNXB2 Connect to the indoor controller board CNXC2 Connect to the indoor controller board CNXA1 Connect to the indoor power board CNXB1 Connect to the indoor power board CNXC1 Connect to the indoor power board CNER ERV con...

Page 38: ...in motor Current detecting resistor Regulator Hall IC Motor winding Power device Pre driver Vm Power supply for motor Vcc Power supply for control Vsp Speed command voltage PG Pulse output for rotation GND 12 7 Thermistor 0 10 20 30 40 50 20 10 0 10 20 30 40 50 Thermistor for lower temperature Temperature Resistance K C 4 14 32 50 68 86 104 122 F Thermistor Characteristic graph Room temperature th...

Page 39: ...ts Resistance pin 1 pin 4 pin 5 pin 4 50k O L pin 6 pin 4 150k O L MVZ A12 18 24 30 36AA7 pin 7 pin 4 Replace indoor controller board I B Replace fan motor MF Replace indoor controller board Is the resistance of the fan motor normal Refer to below table Does the voltage between pin 7 and pin 4 of connector CNMF repeat 0V and 5V Replace the fan motor Is the voltage normal Is there no contact failur...

Page 40: ...ype setting JP3 0 1 2 3 9 Wireless remote controller setting Control PCB setting J41 J42 Settings at time of factory shipment Wireless remote controller 0 Control PCB for both J41 and J42 Four pair number settings are supported The pair number settings of the wireless remote controller and indoor control PCB J41 J42 are given in the table on the left in the table indicates the jumper line is disco...

Page 41: ...FDWLRQV DUH VXEMHFW WR FKDQJH ZLWKRXW QRWLFH 2016 Mitsubishi Electric US Inc 39 13 1 Control box 1 Remove the Electric panel 2 screws Fig 1 DISASSEMBLY PROCEDURE 13 Exercise caution when removing heavy parts ...

Page 42: ...se caution when removing heavy parts 3 Remove the cover over the Return Air thermistor box and unplug the thermistor 4 Pull out the thermistor holder and thermistor inside the box Fig 4 Fig 3 13 2 Thermistor Return Air 1 Remove the Filter panel 2 thumbscrews 2 Remove the Blower panel 2 screws ...

Page 43: ... box area and into the coil section Next slide the coil from the frame 1 Remove the Electrical Blower and Filter panel indicated in sections 1 and 2 2 Remove the Coil panel by removing all of the screws securing it to the 3 smaller panels for refrigerant and drain lines Fig 6 Fig 7 Exercise caution when removing heavy parts 13 3 Coil Assembly Fig 5 Fig 8 3 Slide the smaller panels in the direction...

Page 44: ...SHFL FDWLRQV DUH VXEMHFW WR FKDQJH ZLWKRXW QRWLFH 2016 Mitsubishi Electric US Inc 42 6 Remove lower and side drain pan Fig 9 5 Remove the plate covering the coil assembly to access the thermistors Fig 10 ...

Page 45: ...if installed indicated in section 2 2 Remove the 1 or 2 brackets that secure the coil assembly Exercise caution when removing heavy parts Fig 11 Fig 12 3 Remove the door that covers the small enclosure attached to the fan assembly Fig 12 Unplug the motor and route the wire harness out of the enclosure 4 Remove the 2 screws that secure the fan assembly and slide out ...

Page 46: ...sa com Toll Free 800 433 4822 MITSUBISHI ELECTRIC US INC MEUS DOC MD 1404 K009 December 2016 Please be sure to put the contact address telephone number on this manual before handing it to the customer This product is designed and intended for use in the residential commercial and light industrial environment ...