Mitsubishi Electric MSZ-SF15VA Service Manual Download Page 1

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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 ····································· 17

11. DISASSEMBLY INSTRUCTIONS ···················· 29

SPLIT-TYPE AIR CONDITIONERS

Outdoor unit service manual
MXZ-B·VA Series (OBH554)
MXZ-8A140A (OC316)

SERVICE MANUAL

No. OBH555

INDOOR UNIT

PARTS CATALOG (OBB555)

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

Models

MSZ-SF15VA -

MSZ-SF20VA -

MSZ-SF15VA -

MSZ-SF20VA -

Summary of Contents for MSZ-SF15VA

Page 1: ...8 SERVICE FUNCTIONS 9 9 MICROPROCESSOR CONTROL 11 10 TROUBLESHOOTING 17 11 DISASSEMBLY INSTRUCTIONS 29 SPLIT TYPE AIR CONDITIONERS Outdoor unit service manual MXZ B VA Series OBH554 MXZ 8A140A OC316 SERVICE MANUAL No OBH555 INDOOR UNIT PARTS CATALOG OBB555 NOTE RoHS compliant products have G mark on the spec name plate Models MSZ SF15VA E1 MSZ SF20VA E1 MSZ SF15VA E1 MSZ SF20VA E1 ...

Page 2: ...2 MSZ SF15VA E1 MSZ SF20VA E1 1 New model TECHNICAL CHANGES 1 ...

Page 3: ...ttery 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 filter Air inlet Horizontal vane Air outlet Heat exchanger Operation Remote control indicator lamp receiving section Emergency operation switch E O SW Remote controller ...

Page 4: ...t 21 Heating Super 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 NOTE Test conditions are based on ISO 5151 Cooling Indoor Dry bulb temperature 27 C Wet bulb temperature 19 C Outdoor D...

Page 5: ...TING 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...

Page 6: ... 78 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 ...

Page 7: ...7 MSZ SF15VA MSZ SF20VA WIRING DIAGRAM 6 ...

Page 8: ...red 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 ...

Page 9: ...shown in Table 1 After modification press the RESET button NOTE For modification take out the batteries and press the OPERATE STOP ON OFF button twice 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 modification Same as at left Same as at left Same as at left No 2 u...

Page 10: ...n 10 seconds have passed after the indoor unit was operated with the remote controller If main power is turned OFF or a power failure occurs while AUTO START STOP timer is active the timer setting is can celled 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 d...

Page 11: ...About 2 C or more away from set temperature The room temperature is approaching the set tem perature About 1 to 2 C from set temperature Standby mode Only during multi system operation INDOOR UNIT DISPLAY SECTION Lighted Blinking Not lighted 9 1 COOL OPERATION 1 Press OPERATE STOP ON OFF button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select COOL mode with OPERATION ...

Page 12: ... AUTO CHANGE OVER AUTO MODE OPERATION Once desired temperature is set unit operation is switched automatically between COOL and HEAT operation Mode selection 1 Initial mode When unit starts the operation with AUTO operation from OFF If the room temperature is higher than the set temperature operation starts in COOL mode If the room temperature is equal to or lower than the set temperature operatio...

Page 13: ...ndby In the following cases the horizontal vane returns to the closed position a When OPERATE STOP ON OFF button is pressed POWER OFF b When the operation is stopped by the emergency operation c When ON TIMER is ON standby 6 Dew prevention During COOL or DRY operation with the vane angle at Angle 4 or 5 when the compressor cumulative operation time exceeds 1 hour the vane angle automatically chang...

Page 14: ...imer 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 displa...

Page 15: ...lable 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 complete 1 How to set the weekly timer Press and buttons to continue setting the timer for other days and or numbers 4 Press button to complete and transmit the weekly timer setting which was blink ing goes out and the curr...

Page 16: ... of 24 C The fan speed shifts to Med 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 case of latter normal operation will start NOTE Do not press EMERGENCY OPERATION switch during nor mal operation Operation mode...

Page 17: ...he 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 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 abnormal ity To make s...

Page 18: ...t with the indoor unit failure mode table Refer to 10 2 2 Make sure to check at least two consecutive blinking cycles 2 Releasing the failure mode recall function 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 confirm the abnor...

Page 19: ...eristics of the main indoor coil ther mistor the sub indoor coil thermistor 10 7 3 time flash 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 flash 2 5 second OFF Indoor fan motor The rotational frequency feedback signal is not emitted during the 12 seconds the indoor f...

Page 20: ...lash on and off at 0 5 sec ond intervals Cause Indoor Outdoor unit Miswiring or trouble of serial signal Left lamp 2 time flash Cause Indoor unit Trouble of room temperature indoor coil thermistor Left lamp 3 time flash Cause Indoor unit Trouble of indoor fan motor Left lamp 4 time flash Cause Indoor unit Trouble of indoor unit control system Left lamp 5 time flash Cause Outdoor unit Outdoor power...

Page 21: ... memory of the indoor electronic control P C board Replace the indoor electronic control P C board 5 Outdoor power sys tem Upper lamp flashes 5 time flash 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...

Page 22: ...has the priority 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...

Page 23: ...c control P C board 1 Measure the voltage between 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 EMERGENC...

Page 24: ...eceiving part Yes Measure the voltage between receiver P C board connector CN301 No 2 and No 3 when the remote controller button is pressed Is the voltage approx 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 Look at the image of the signal transmitting section of the remote co...

Page 25: ...n 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 approx 4 Ω No Replace the indoor electronic control P C board and the indoor fan motor Repl...

Page 26: ... INDICATOR 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 Short circuit 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 short circuit between outdo...

Page 27: ...or the 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 ...

Page 28: ...of Auto restart function Solder the Jumper wire to JR07 D Refer to 8 3 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 S...

Page 29: ...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 vane Terminal with locking mechanism Detaching points The terminal which has the locking mechanism can be detached as shown below T...

Page 30: ...out the SW P C board 8 Disconnect the following connectors on the electronic control P C board CN211 Indoor fan motor CN201 Terminal block CN211 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 ...

Page 31: ...y 1 Remove 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...

Page 32: ... 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 Photo 7 Photo 8 Photo 9 Motor band Screws of the motor bed Screw of the line flow fan Screws of the left side of the heat...

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