Mitsubishi Electric MSZ-SF15VA-E1 Service Manual Download Page 8 | Manualshive

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8

Indoor

heat

exchanger

Flared connection

Room temperature

thermistor

RT11

Flared connection

Refrigerant pipe ø9.52

(with heat insulator)

Refrigerant pipe ø6.35

(with heat insulator)

Indoor coil

thermistor

RT12 (main)

Indoor coil

thermistor

RT13 (sub)

Refrigerant flow in cooling

Refrigerant flow in heating

Unit: mm

MSZ-SF15VA MSZ-SF20VA

REFRIGERANT SYSTEM DIAGRAM

7

OBH555D

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Summary of Contents for MSZ-SF15VA-E1

Page 1: ...oid OBH555 REVISED EDITION C CONTENTS 1 TECHNICAL CHANGES 2 2 PART NAMES AND FUNCTIONS 3 3 SPECIFICATION 4 4 NOISE CRITERIA CURVES 5 5 OUTLINES AND DIMENSIONS 6 6 WIRING DIAGRAM 7 7 REFRIGERANT SYSTEM DIAGRAM 8 8 SERVICE FUNCTIONS 9 9 MICROPROCESSOR CONTROL 11 10 TROUBLESHOOTING 18 11 DISASSEMBLY INSTRUCTIONS 30 Outdoor unit service manual MXZ B VA Series OBH554 MXZ C VA Series OBH584 MXZ D VA Ser...

Page 2: ...tion of the air conditioner turn off the power supply breaker and remove the power plug Discharge the capacitor before the work involving the electric parts Precautions during the repair service Do not perform the work involving the electric parts with wet hands Do not pour water into the electric parts Do not touch the refrigerant Do not touch the hot or cold areas in the refrigeration cycle When...

Page 3: ...y AAA for remote controller 2 Wireless remote controller 1 Felt tape Used for left or left rear piping 1 MSZ SF15VA MSZ SF20VA PART NAMES AND FUNCTIONS 2 Front panel Air f lter Air inlet Horizontal vane Air outlet Heat exchanger Operation Remote control indicator lamp receiving section Emergency operation switch E O SW Remote controller OBH555D ...

Page 4: ... High dB A 40 42 High 35 Med 30 Low 26 Silent 21 Fan speed Cooling Super High rpm 1 500 1 600 High 1 300 Med 1 130 Low 980 Silent 900 Heating Super High rpm 1 500 1 600 High 1 350 Med 1 160 Low 1 030 Silent 910 Fan speed regulator 5 Remote controller model SG10D E1 E2 E3 ER3 SG15D E4 ER4 NOTE Test conditions are based on ISO 5151 Cooling Indoor Dry bulb temperature 27 C Wet bulb temperature 19 C O...

Page 5: ... 42 42 NC 10 MSZ SF20VA Test conditions Cooling Dry bulb temperature 27 C Wet bulb temperature 19 C Heating Dry bulb temperature 20 C INDOOR UNIT WALL MICROPHONE 0 8m 1m 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 COOLING FUNCTION SPL dB A LINE Super High FAN SPE...

Page 6: ...45 335 300 145 145 81 208 166 42 167 187 209 21 5 41 760 740 10 5 168 45 56 505 179 56 202 250 8 110 41 56 Installation plate Piping Drain hose Air out 60 193 18 56 56 47 43 Piping Insulation Liquid line Gas line Drain hose 35 O D 6 35 0 39m Flared connection 6 35 Ø Ø Ø 9 52 0 34m Flared connection 9 52 Ø Ø Insulation 28 Connected part 16 O D Ø Ø OBH555D ...

Page 7: ...7 MSZ SF15VA E1 E2 MSZ SF20VA E1 E2 WIRING DIAGRAM 6 MSZ SF15VA E4 ER4 MSZ SF20VA E4 ER4 MSZ SF15VA E3 ER3 MSZ SF20VA E3 ER3 OBH555D ...

Page 8: ...connection Refrigerant pipe ø9 52 with heat insulator Refrigerant pipe ø6 35 with heat insulator Indoor coil thermistor RT12 main Indoor coil thermistor RT13 sub Refrigerant flow in cooling Refrigerant flow in heating Unit mm MSZ SF15VA MSZ SF20VA REFRIGERANT SYSTEM DIAGRAM 7 OBH555D ...

Page 9: ...er of indoor unit as shown in Table 1 After modification press the RESET button NOTE For modification take out the batteries and press the STOP OPERATE MSZ SF VA E4 ER4 OPERATE STOP Other models button 2 or 3 times at first After modification put back the batteries then press the RESET button Table 1 1 unit operation 2 units operation 3 units operation 4 units operation No 1 unit No modif cation S...

Page 10: ...reaker OFF due to the rush of starting current systematize other home appliance 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 ...

Page 11: ...dication of remote controller model is on back FAN SPEED CONTROL button OPERATION SELECT button ECONO COOL button CLOCK SET button WEEKLY TIMER set button TIME TIMER set buttons FORWARD button BACKWARD button RESET button i save button VANE CONTROL button Signal transmitting section Operation display section TEMPERATURE buttons STOP OPERATE OFF ON button Indication of remote controller model is on...

Page 12: ...n operates following the cold air prevention control 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 exchanger ris...

Page 13: ...hes as shown in the figure below In this case please set all the indoor units to the same operation mode When indoor unit starts the operation while the defrosting of outdoor unit is being done it takes a few minutes max 10 min utes to blow out the warm air In the heating operation though indoor unit that does not operate may get warm or the sound of refrigerant flowing may be heard they are not m...

Page 14: ... a result energy can be saved To cancel this operation select a different mode or press one of the following buttons in ECONO COOL operation ECONO COOL VANE CONTROL button 9 7 TIMER OPERATION 1 How to set the time 1 Check that the current time is set correctly NOTE Timer operation will not work without setting the current time Initially 0 00 blinks at the current time display of TIME MONITOR so se...

Page 15: ... power is restored 9 8 WEEKLY TIMER OPERATION A maximum of 4 ON or OFF timers can be set for individual days of the week A maximum of 28 ON or OFF timers can be set for a week 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 timer the weekly timer operation will start again after the simple ON OFF timer is com...

Page 16: ...setting Press button once after all the settings are complete All the weekly timer settings will be saved Press button to enter the weekly timer setting mode and press and hold button for 5 seconds to erase all weekly timer settings Point the remote controller toward the indoor unit 5 Press button to turn the weekly timer ON lights When the weekly timer is ON the day of the week whose timer settin...

Page 17: ...PERATION switch during normal operation Operation mode COOL HEAT Set temperature 24 C Fan speed Med Horizontal vane Auto The operation mode is indicated by the Operation Indicator lamp as following Operation Indicator lamp EMERGENCY COOL EMERGENCY HEAT STOP Lighted Not lighted 9 9 i save OPERATION 1 How to set i save operation 1 Press STOP OPERATE MSZ SF VA E4 ER4 OPERATE STOP Other models button ...

Page 18: ...e cabinet the top panel and the P C board 3 When removing the 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 connector housing DO NOT pull the lead wires 3 Troubleshooting procedure 1 Check if the OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF to indicate an abnormality To make sure...

Page 19: ...t least 2 consecutive blinking cycles 2 Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller The outdoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the outdoor unit failure mode table Refer to outdoor unit service manual Make sure to check at l...

Page 20: ... of the main indoor coil ther mistor the sub indoor coil thermistor 10 7 3 time f ash 2 5 second OFF Serial signal The serial signal from outdoor unit is not re ceived for a maximum of 6 minutes Refer to 10 6 How to check miswiring and serial signal error 11 time f ash 2 5 second OFF Indoor fan motor The rotational frequency feedback signal is not emitted during the 12 seconds the indoor fan opera...

Page 21: ...Flash on and off at 0 5 sec ond intervals Cause Indoor Outdoor unit Miswiring or trouble of serial signal Left lamp 2 time f ash Cause Indoor unit Trouble of room temperature indoor coil thermistor Left lamp 3 time f ash Cause Indoor unit Trouble of indoor fan motor Left lamp 4 time f ash Cause Indoor unit Trouble of indoor unit control system Left lamp 5 time f ash Cause Outdoor unit Outdoor powe...

Page 22: ...electronic control P C board Replace the indoor electronic control P C board 5 Outdoor power sys tem Left lamp f ashes 5 time f ash 2 5 second OFF It consecutively occurs 3 times that the com pressor stops for overcurrent protection or start up failure protection within 1 minute after start up Refer to How to check of in verter compressor Refer to outdoor unit service manual Check the stop valve 6...

Page 23: ...riority Unify the operation mode Refer to outdoor unit service manual 10 5 TROUBLE CRITERION OF MAIN PARTS MSZ SF15VA MSZ SF20VA Part name Check method and criterion Figure Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 Measure the resistance with a tester Refer to 10 7 Test point diagram and voltage Indoor electronic control P C board for the chart of thermistor Indoor fan moto...

Page 24: ...ween CN211 and 2 Measure the voltage between CN211 and If more than 12 seconds passes after EMERGENCY OPERATION switch is pressed the voltage measured at 2 above goes 0 VDC although the indoor P C board is normal Does the voltage between CN211 and on the indoor electronic control P C board rise to the range of 2 to 6 VDC within 12 seconds after EMERGENCY OPERATION switch is pressed Replace the ind...

Page 25: ... board connector CN301 No 2 and No 3 when the remote controller button is pressed Is the voltage approximately 4 VDC 5 VDC No Replace the indoor electronic control P C board Replace the receiver P C board Is a signal transmitted from a remote controller of a different device Yes Stop the transmission of signal between the different device and its remote control ler No 1 2 1 If the inverter fluores...

Page 26: ...easure 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 mately 4 Ω No Replace the indoor electronic control P C board and the indoor fan motor Repl...

Page 27: ...CATOR lamp light up Confirmation of the power to the indoor unit Press EMERGENCY OPERATION switch once Check the power supply A Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not miswiring Bridge the outdoor terminal block S2 and S3 1 B Turn ON the power supply Check the wiring Correct them Turn OFF the power supply Remove the bridge between the outdoor terminal...

Page 28: ...n of specif c 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 outdoor unit of the air conditioner indo...

Page 29: ...Auto restart function solder the Jumper wire to JR07 Refer to 8 4 MSZ SF15VA MSZ SF20VA Indoor electronic control P C board 10 7 Test point diagram and voltage Display P C board Receiver P C board SW P C board Resistor R111 Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 Temperature C Resistance kΩ Fuse F11 T3 15AL250V Varistor NR11 AC230V Emergency operation switch E O SW SW1 Co...

Page 30: ...king lever or not 2 The terminal with this connector has the locking mechanism Slide the sleeve Pull the terminal while pushing the locking lever Hold the sleeve and pull out the terminal slowly Connector Sleeve Locking lever Screws of the panel Front panel Horizontal vanes Terminal with locking mechanism Detaching points The terminal which has the locking mechanism can be detached as shown below ...

Page 31: ...ol P C board CN211 Indoor fan motor CN201 Terminal block CN112 Indoor coil thermistor CN151 Horizontal vane motor CN109 Receiver P C board 9 Pull out the electronic control P C board from the electrical box 10 Remove the earth wire connected to the indoor elec tronic control P C board from the electrical box Photo 3 NOTE MSZ SF15VA E1 E2 and MSZ SF20VA E1 E2 do not have locking mechanism MSZ SF15V...

Page 32: ...ove the panel refer to 1 and the corner box 2 Remove the V A clamp Photo 2 3 Remove the electrical cover Photo 3 4 Disconnect the following connector on the electronic control P C board CN151 Horizontal vane motor 5 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly Photo 6 6 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to 4 2 Remove the screws...

Page 33: ...r part of the water cover and unhook the catch 7 Pull the water cover to the right to remove it 8 Remove the motor bed together with fan motor and motor band 9 Release the hooks of the motor band Remove the motor band Pull out the indoor fan motor 10 Remove the screws fixing the left side of the heat exchanger Photo 12 11 Lift the heat exchanger and pull out the line flow fan to the lower left Pho...

Page 34: ...in Jan 2016 No OBH555 REVISED EDITION D Distributed in Dec 2013 No OBH555 REVISED EDITION C Distributed in Apr 2013 No OBH555 REVISED EDITION B Distributed in Aug 2012 No OBH555 REVISED EDITION A Distributed in Oct 2009 No OBH555 7 Made in Japan New publication effective Jan 2016 Specifications are subject to change without notice ...

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