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Mitsubishi Electric SUZ-M-VA Series, Service Manual

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Mitsubishi Electric SUZ-M-VA Series Service Manual Download Page 36

36

Indoor coil thermistor [RT12,RT14,RT15 (MAIN), RT13 (SUB)] 

Room temperature thermistor (RT11)

Temperature (°C)

Resistance (kΩ)

MFZ-KT25VG  MFZ-KT35VG  MFZ-KT50VG  MFZ-KT60VG

Indoor electronic control P.C. board

11-7. TEST POINT DIAGRAM AND VOLTAGE

Display receiver P.C. board

To disable "Auto 
restart function",  
cut the Jumper 
wire to JR77.
(Refer to 9-3.)

Emergency operation 
switch (E. O. SW) (SW301)

12 V DC

FUSE (F11) 
T3.15AL250V

Power supply (CN201) 
input 230 V AC

5 V DC

Varistor

(NR11)

Indoor coil thermistor (CN112)
Indoor coil thermistor RT15 (MAIN 3)   
Indoor coil thermistor RT14 (MAIN 2)   
Indoor coil thermistor RT12 (MAIN 1)   
Indoor coil thermistor RT13 (SUB)     

Serial signal 
input (CN202)

Connect to display 
receiver P.C. board 
(CN1J1) 

R32 sensor (CNSA) 

Indoor fan motor
(CN211)

 (+)0 or 15 V DC
 (+)3-6 V DC
 15 V DC
 (–) GND (high-

voltage DC)

 325 V DC

Connector cable 
(CN104)

Timer short mode 
point (2 points)
(Refer to 8-1.)

Room temperature 
thermistor RT11
(CN111)

GND

Resistor

(R111)

Connect to indoor elec-
tronic control P.C. board 
(CN301)

Vane motor (CN151)
Horizontal 
vane back  -
Horizontal 
vane front  -

Multi-flow vane 

-

JR05

JR06

Modification
point for 
individual 
operation
(Refer to 9-2.)

)

OBH843

Summary of Contents for SUZ-M-VA Series

Page 1: ...ES AND FUNCTIONS 7 4 SPECIFICATION 8 5 NOISE CRITERIA CURVES 9 6 OUTLINES AND DIMENSIONS 11 7 WIRING DIAGRAM 12 8 REFRIGERANT SYSTEM DIAGRAM 13 9 SERVICE FUNCTIONS 15 10 MICROPROCESSOR CONTROL 17 11 TROUBLESHOOTING 25 12 DISASSEMBLY INSTRUCTIONS 37 No OBH843 Outdoor unit service manual SUZ M VA Series OCH684 MXZ F VF Series OBH790 MFZ KT25VG MFZ KT35VG MFZ KT50VG MFZ KT60VG ...

Page 2: ...ld areas in the refrigeration cycle When the repair or the inspection of the circuit needs to be done without turning off the power exercise great caution not to touch the live parts Use the specified refrigerant only Never use any refrigerant other than that specified Doing so may cause a burst an explosion or fire when the unit is being used serviced or disposed of Correct refrigerant is specifi...

Page 3: ...work on the systems 1 2 Work Procedure Work shall be undertaken under a controlled procedure so as to minimize the risk of a flammable gas or vapor being present while the work is being performed 1 3 General Work Area All maintenance staff and others working in the local area shall be instructed on the nature of work being carried out Work in confined spaces shall be avoided The area around the wo...

Page 4: ...ve number of connections terminals not made to original specification damage to seals incorrect fitting of glands etc Ensure that the apparatus is mounted securely Ensure that seals or sealing materials have not degraded to the point that they no longer serve the purpose of prevent ing the ingress of flammable atmospheres Replacement parts shall be in accordance with the manufacturer s specificati...

Page 5: ...ystem when charging is complete if not already Extreme care shall be taken not to overfill the refrigeration system Prior to recharging the system it shall be pressure tested with the appropriate purging gas The system shall be leak tested on completion of charging but prior to commissioning A follow up leak test shall be carried out prior to leaving the site 9 Decommissioning Before carrying out ...

Page 6: ...et of instructions concerning the equipment that is at hand and shall be suitable for the recovery of all appropriate refrigerants including when applicable flammable refriger ants In addition a set of calibrated weighing scales shall be available and in good working order Hoses shall be com plete with leak free disconnect couplings and in good condition Before using the recovery machine check tha...

Page 7: ...tical vane Multi flow vane ACCESSORIES Model MFZ KT25 35 50VG MFZ KT60VG Remote controller holder 1 1 Fixing screw for 1 3 5 x 16 mm Black 2 2 Pipe cover 1 1 Band 2 2 Battery AAA for remote controller 2 2 Indoor unit mounting bracket 1 1 Fixing screw for 6 4 x 25 mm 5 5 Wood screw for the indoor unit fixation 4 4 Washer of 8 4 4 Felt tape Used for left or left rear piping 1 1 Wireless remote contro...

Page 8: ... High 37 44 47 Med 30 40 41 Low 23 35 35 Silent 19 29 29 Fan speed Cooling Super High rpm 1000 1120 1330 High 900 970 1120 Med 770 820 900 Low 610 670 770 Silent 520 580 580 Heating Super High rpm 1080 1250 1300 High 850 1060 1130 Med 690 890 910 Low 530 750 750 Silent 480 610 610 Special remarks Multi Airflow Cooling Super High m3 h 540 738 900 High 468 624 738 Med 390 516 576 Low 288 402 480 Sil...

Page 9: ... bulb temperature 20 C Outdoor Dry bulb temperature 7 C Wet bulb temperature 6 C 1 Measured under rated operating frequency 5 NOISE CRITERIA CURVES NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 80 70 60 50 40 30 20 10 0 63 125 250 500 1000 2000 4000 8000 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz COOLING FUNCTION 41 44 SPL dB A LINE Super High FAN SPEED HEATING NC 10 ...

Page 10: ... 2000 4000 8000 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz COOLING FUNCTION 53 51 SPL dB A LINE Super High FAN SPEED HEATING NC 10 MFZ KT50VG NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 80 70 60 50 40 30 20 10 0 63 125 250 500 1000 2000 4000 8000 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz COOLING FUNCTION 48 49 SPL dB A LINE S...

Page 11: ...11 OUTLINES AND DIMENSIONS 6 Unit mm MFZ KT25VG MFZ KT35VG MFZ KT50VG MFZ KT60VG OBH843 ...

Page 12: ...12 7 WIRING DIAGRAM MFZ KT25VG MFZ KT35VG MFZ KT50VG MFZ KT60VG OBH843 ...

Page 13: ...lator Refrigerant pipe 6 35 with heat insulator Indoor coil thermistor RT12 main Distributor Indoor heat exchanger Room temperature thermistor RT11 Indoor coil thermistor RT13 sub Refrigerant flow in cooling Refrigerant flow in heating Refrigerant pipe 12 7 with heat insulator Refrigerant pipe 6 35 with heat insulator Indoor coil thermistor RT12 main Distributor Flared connection Flared connection...

Page 14: ...RT11 Indoor coil thermistor RT14 RT15 main RT13 sub Refrigerant flow in cooling Refrigerant flow in heating Refrigerant pipe 15 88 with heat insulator Refrigerant pipe 6 35 with heat insulator Indoor coil thermistor RT12 main Distributor Joint pipe 12 7 12 7 15 88 MFZ KT60VG Unit mm OBH843 ...

Page 15: ...R EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT A maximum of 4 indoor units with wireless remote controllers can be used in a room To operate the indoor units individually with each remote controller assign a number to each remote controller according to the number of the indoor unit This setting can be set only when all the following conditions are met The remote controller is powered OFF Weekly timer...

Page 16: ...l 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 cur rent by adding to the system that allows the units to start one by one 9 3 AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller the operation mode the set temperature and the fan speed are memorized ...

Page 17: ...cation Indication Operation state Room temperature The unit is operating to reach the set temperature About 2 C or more away from set tempera ture The room temperature is approaching the set tem perature About 1 to 2 C from set temperature Standby mode only during multi system operation Lit Blinking Not lit 10 1 COOL OPERATION 1 Press STOP OPERATE OFF ON button OPERATION INDICATOR lamp of the indo...

Page 18: ...heat exchanger becomes too high the high pressure protection works This mode continues until the temperature of indoor heat exchanger falls 3 Defrosting Defrosting starts when the temperature of outdoor heat exchanger becomes too low The compressor stops once the indoor outdoor fans stop the 4 way valve reverses and the compressor re starts This mode continues until the temperature of outdoor heat...

Page 19: ...n the following conditions During COOL DRY The room temperature is close to set temperature The air conditioner has operated for 0 5 to 1 hour During HEAT The airflow temperature is low During defrosting operation start of operation etc NOTE Movement at the start of the 2 FLOW operation COOL DRY HEAT It takes 0 5 to 1 minute to start the 2 FLOW operation HEAT When cold air blows out from the air o...

Page 20: ...CONO COOL operation ECONOmical operation When ECONO COOL button is pressed in COOL mode set temperature is automatically set 2 C higher by the microprocessor However the temperature on the LCD screen on the remote controller is not changed Also the horizontal vane swings in various cycle SWING operation makes you feel cooler than set temperature So even though the set temperature is higher the air...

Page 21: ...mer setting a Press OFF TIMER button during operation b Set the time of the timer using TIME SET buttons and Each time FORWARD button is pressed the set time increases by 10 minutes each time BACKWARD but ton is pressed the set time decreases by 10 minutes 2 To release the timer To release ON timer press ON TIMER button To release OFF timer press OFF TIMER button TIMER is cancelled and the display...

Page 22: ...ld down the button to change the time quickly The temperature can be set between 16 C and 31 C at weekly timer blinks Pressing selects the day of the week to be set Pressing selects the setting number E g Mon Tue Sun and 1 are selected All days can be selected NOTE The simple ON OFF timer setting is available while the weekly timer is on In this case the ON OFF timer has priority over the weekly t...

Page 23: ... C 2 groups of setting can be saved One for COOL one for HEAT i save operation and the weekly timer operation cannot be used together 2 How to cancel operation Press i save button again i save operation can also be cancelled by pressing OPERATION SELECT button to change the operation mode The same setting is selected from the next time by simply pressing i save button 4 Press button to complete an...

Page 24: ... 24 C The fan speed shifts to Medium The coil frost prevention works even in the test run or the emergency operation In the test run or emergency operation the horizontal vane operates in VANE AUTO mode Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any signal from the remote controller In the latter case normal operation will start NOT...

Page 25: ... and discoloration 4 When troubleshooting Refer to 11 2 11 3 and 11 4 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 Lead wiring Connector housing Incorrect Correct Press RESET button with a thin instrument and then use the remote controller Remove the front lid and insert batteries ...

Page 26: ...conds without beep The outdoor unit is abnormal The indoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the table of indoor unit failure mode recall function Refer to indoor unit service manual Make sure to check at least 2 consecutive blinking cycles 2 Releasing the failure mode recall function Release the failure mode recall function by the followin...

Page 27: ... blink 2 5 second OFF Serial signal error The serial signal from the outdoor unit is not received for a maximum of 6 minutes 1 time blink every 0 5 second Refer to the characteristics of the room temperature thermistor 11 7 Room temperature thermistor The room temperature thermistor short or open circuit is detected every 8 seconds during operation Not lit Normal Left lamp of OPERATION INDICATOR l...

Page 28: ...r control system Check room temperature thermistor and indoor coil thermis tor Refer to 11 7 Test point diagram and voltage Refer to How to check the inverter compressor Refer to Check of outdoor thermistors Replace the inverter P C board or the outdoor electronic control P C board Left lamp 14 time blink or more Cause Outdoor unit Other abnormality Left lamp blinks 3 times then right lamp lights ...

Page 29: ...an operation Refer to 11 6 How to check miswiring and serial signal error Refer to NOTE Refer to 11 6 Check of indoor fan motor Indoor unit and outdoor unit do not operate Indoor unit and outdoor unit do not operate Left lamp blinks 5 time blink Left lamp blinks 6 time blink Indoor unit and outdoor unit do not operate Indoor unit and outdoor unit do not operate Indoor unit and outdoor unit do not ...

Page 30: ...ad wire BRN other one 350 Ω Horizontal vane motor MV2 BACK Measure the resistance between the terminals with a tester Part temperature 10 C 30 C Normal 219 Ω 273 Ω BRN other one 250 Ω Color of the lead wire Normal 219 Ω 273 Ω BRN other one 250 Ω Color of the lead wire Check 11 6 Check of indoor fan motor and Check of indoor electronic control P C board and indoor fan motor OPERATION INDICATOR Not ...

Page 31: ...ait 5 seconds or more and then press EMERGENCY OPERATION switch Measure the supply voltage as follows within 12 seconds after EMER GENCY OPERATION switch is pressed If more than 12 seconds passes turn OFF the power supply and turn it ON again then measure the voltage Indoor electronic control P C board 1 Measure the voltage between CN211 and 2 Measure the voltage between CN211 and If more than 12 ...

Page 32: ...r of remote controller Refer to 9 2 Check if the unit operates with the remote controller Does the unit operate with the remote controller Yes No OK Measure the voltage between display receiver P C board connector CN301 and when the remote controller button is pressed Is the voltage approximately 4 V DC 5 V DC No Yes Replace the indoor electronic control P C board 1 Look at the image of the signal...

Page 33: ... sure to check both the fuse and the varistor in any case Is the fuse F11 blown only Measure the resistance between CN211 and of indoor fan motor connector 1 2 Yes Is the resistance 1MΩ or more Replace the fuse F11 and the indoor fan motor 3 No Replace the fuse F11 3 Measure the resistance of resis tor R111 on the indoor electronic control P C board Is the resistance of resistor R111 approxi matel...

Page 34: ...ck S1 and S2 Does the left lamp of OPERATION INDICATOR lamp light up Confirmation of the power supply to the indoor unit Press EMERGENCY OPERATION switch once Check the power supply Is the serial signal error indicated 6 minutes later Turn OFF the power supply Check once again if the indoor outdoor connecting wire is not wrongly connected Short circuit the outdoor terminal block S2 and S3 1 Check ...

Page 35: ...he installation condition combination of specific conditions such as antennas or wiring Check the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor outd...

Page 36: ...ndoor coil thermistor CN112 Indoor coil thermistor RT15 MAIN 3 Indoor coil thermistor RT14 MAIN 2 Indoor coil thermistor RT12 MAIN 1 Indoor coil thermistor RT13 SUB Serial signal input CN202 Connect to display receiver P C board CN1J1 R32 sensor CNSA Indoor fan motor CN211 0 or 15 V DC 3 6 V DC 15 V DC GND high voltage DC 325 V DC Connector cable CN104 Timer short mode point 2 points Refer to 8 1 ...

Page 37: ...or coil thermistor connector CN112 Photo 5 7 Rotate the display receiver P C board holder to the right side and disconnect the vane motor relay con nector Photo 6 8 Disengage the electrical box from the upper catch and pull out the electrical box from the box 37 DISASSEMBLY INSTRUCTIONS 12 Screw of the panel Push the marks Screw of the electrical cover Screw of the panel Screw of the V A clamp cov...

Page 38: ... 6 4 Removing the nozzle assembly 1 Remove the panel Refer to section 1 2 Rotate the display receiver P C board holder to the right side and disconnect the vane motor relay con nector 3 Remove the fixed screws on the both sides of the nozzle 4 Disengage the catches on the nozzle from the box 5 Hold the both sides of the nozzle Rotate the nozzle toward you around the right and left ribs to remove i...

Page 39: ...h it from the rib on the multi flow vane Slide the vane shaft in arrow 2 direction and separate it from the unit body Multi flow vane 1 1 See the figure below and push to open the indicated places on the horizontal vanes between front and back with your fingers so that you can access 4 vane shafts positioned on the back of the horizontal vanes vane shafts on each horizontal vane 2 1 Open the horiz...

Page 40: ...horizontal vane motor Connect the connectors to the horizontal vane motors by referring to the colors red and white noted on the vane motor support Photo 9 Photo 10 Photo 11 Photo 12 6 Removing the multi flow vane motor unit 1 Remove the panel Refer to section 1 2 Disconnect the connector from the multi flow vane motor unit 3 Remove the screws of the multi flow vane motor unit and pull out the mul...

Page 41: ...ove the motor bed together with the indoor fan motor and the motor band 8 Disengage the catches on the motor band and remove the motor band and pull out the indoor fan motor 9 Remove the screws fixing the both sides of the heat exchanger 10 Disengage the catch on the right side on the heat exchanger 11 Lift the heat exchanger and pull out the line flow fan upward Photo 16 Photo 13 Photo 14 Photo 1...

Page 42: ...e 3 Cut the band fixing the lead wire 4 Disengage the R32 sensor cover from the R32 sensor plate 5 Disengage the catches to open the R32 sensor cover 6 Take the R32 sensor then disconnect the lead wire Photo 18 Photo 20 Photo 21 Photo 19 Screw of the R32 sensor plate R32 sensor plate R32 sensor plate R32 sensor cover R32 sensor Band fixing the lead wire Catch 42 OBH843 ...

Page 43: ...43 OBH843 ...

Page 44: ...t 2019 MITSUBISHI ELECTRIC CORPORATION Published Jun 2019 No OBH843 Made in Japan HEAD OFFICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Specifications are subject to change without notice ...

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