Mitsubishi Electric Mr.Slim MSZ-GC22NA - C1 Service Manual Download Page 1 | Manualshive

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SERVICE MANUAL

CONTENTS

1. PART NAMES AND FUNCTIONS ····················· 3
2. SPECIFICATION ················································ 4
3. OUTLINES AND DIMENSIONS ························ 5
4. WIRING DIAGRAM ············································ 7
5. REFRIGERANT SYSTEM DIAGRAM ··············· 9
6. SERVICE FUNCTIONS ··································· 10

7. MICROPROCESSOR CONTROL ··················· 12
8. TROUBLESHOOTING ····································· 18
9. DISASSEMBLY INSTRUCTIONS ···················· 39

Models

MSZ-GC22NA -

C1

MSZ-GC25NA -

C1

MSZ-GC35NA -

C1

MSZ-GC35NA -

C2

MSZ-GC50NA -

C1

MSZ-GC60NA -

C1

MSZ-GC71NA -

C1

SPLIT-TYPE AIR CONDITIONERS

MSZ-GC22/25/35NA

INDOOR UNIT

Outdoor unit service manual

MUZ-GC·NA Series(OBH482)

MXZ-A·NA Series (OB430)

PARTS CATALOG (OBB481)

NOTE:

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

No. OBH481

REVISED EDITION-A

Please void OBH481.

Revision A:

•

MSZ-GC35NA -

C2

has been added.

1
2
3
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Summary of Contents for Mr.Slim MSZ-GC22NA - C1

Page 1: ...SEMBLY INSTRUCTIONS 39 Models MSZ GC22NA C1 MSZ GC25NA C1 MSZ GC35NA C1 MSZ GC35NA C2 MSZ GC50NA C1 MSZ GC60NA C1 MSZ GC71NA C1 SPLIT TYPE AIR CONDITIONERS MSZ GC22 25 35NA INDOOR UNIT Outdoor unit service manual MUZ GC NA Series OBH482 MXZ A NA Series OB430 PARTS CATALOG OBB481 NOTE RoHS compliant products have G mark on the spec name plate No OBH481 REVISED EDITION A Please void OBH481 Revision ...

Page 2: ...2 Revision A MSZ GC35NA C2 has been added MSZ GC35NA C1 MSZ GC35NA C2 FAN MOTOR has been changed AC DC ...

Page 3: ... vane Remote controller Line flow fan Air cleaning filter Anti allergy enzyme filter option MSZ GC22NA MSZ GC25NA MSZ GC35NA MSZ GC60NA MSZ GC71NA MSZ GC50NA MSZ GC22NA MSZ GC25NA MSZ GC35NA MSZ GC60NA MSZ GC71NA MSZ GC50NA ACCESSORIES MSZ GC22 25 35 50 MSZ GC60 71 Installation plate 1 1 Installation plate fixing screw 4 25 mm 5 7 Remote controller holder 1 1 Fixing screw for 3 5 1 6 mm Black 2 2 ...

Page 4: ...SZ GC71NA Function Cooling Heating Cooling Heating Cooling Heating Power supply Single phase 220 230 V 60 Hz Electrical data Running current 1 A 0 35 0 6 Power input 1 W 40 60 Fan motor Model RC0J30 CC RC0J56 AA Current 1 A 0 35 0 6 Dimensions W H D mm 780 298 210 1 100 325 258 Weight kg 9 16 Special remarks Air flow Super High m3 h 654 Air flow High Med Low 594 445 414 1 032 768 522 1 032 786 522...

Page 5: ...ong hole 11 20 Oblong hole Installation plate Indoor unit Wall hole ø65 Air in Air out Installation plate Piping Drain hose 234 5 788 19 159 58 MSZ GC22NA MSZ GC25NA MSZ GC35NA Specifications and rating conditions of main electric parts Model Item MSZ GC22 25 35 MSZ GC50 MSZ GC60 71 Fuse F11 T3 15AL 250 V Horizontal vane motor MV 12 VDC MSBPC20M16 12 VDC 250 Ω at 25 C Vane motor MV1 MV2 MP20 MP20 ...

Page 6: ...m Gas line ø12 0 43 m Insulation ø50 O D ø32 I D for MSZ GC60 for MSZ GC71 19 159 58 MSZ GC60NA MSZ GC71NA Unit mm Unit mm 155 155 335 320 41 5 215 42 5 214 3 287 5 70 55 55 55 225 225 or more 7 100 90 106 298 102 624 5 780 210 5 53 5 19 159 58 14 273 5 234 Air in Air out Wall hole ø65 Indoor unit Installation plate Installation plate 11 20 Oblong hole 11 26 Oblong hole Insulation ø28 Drain hose ø...

Page 7: ...7 MSZ GC22NA MSZ GC25NA MSZ GC35NA C1 MSZ GC35NA C2 4 WIRING DIAGRAM ...

Page 8: ...8 MSZ GC50NA MSZ GC60NA MSZ GC71NA ...

Page 9: ... heat insulator Strainer 50 Indoor coil thermistor RT12 main Refrigerant flow in cooling Refrigerant flow in heating MSZ GC50NA MSZ GC60NA Unit mm Indoor heat exchanger Room temperature thermistor RT11 Refrigerant pipe ø12 7 with heat insulator Flared connection Flared connection Indoor coil thermistor RT12 main Refrigerant pipe ø6 35 with heat insulator Distributor Indoor coil thermistor RT13 sub...

Page 10: ...finish modification put back the batteries then press the RESET button J2 J1 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 only accept the signal from the remote controller that has been assigned t...

Page 11: ...d 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 JR07 CN151 CN211 CN112 CN1R1 BZ 6 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 by the indoor electronic control P C board The AUTO RESTART FUNCTION set...

Page 12: ...on OPERATE STOP ON OFF button TEMPERATURE buttons Indication of remote controller model is on back ON TIMER button CLOCK SET button TIME SET buttons FORWARD button BACKWARD button VANE CONTROL button Horizontal vane button OFF TIMER button LONG button MSZ GC60 71 RESET button WIDE VANE button Vertical vane button MSZ GC60 71 FAN SPEED CONTROL button OPERATION SELECT button ECONO COOL button These ...

Page 13: ... speed 2 High pressure protection The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the con densing pressure from increasing excessively When the temperature of indoor heat exchanger becomes too high the high pressure protection works The indoor fan operates following the cold air prevention control This mode continues until the temperatu...

Page 14: ...arts or finishes 4 VANE AUTO mode The microprocessor automatically determines the vane angle and operation to make the optimum room temperature dis tribution 7 5 AUTO VANE OPERATION 1 Horizontal vane 1 Vane motor drive These models are equipped with a stepping motor for the horizontal vane The rotating direction speed and angle of the motor are controlled by pulse signals approx 12 V transmitted f...

Page 15: ...to other operation mode 9 To change the air flow direction not to blow directly onto your body MSZ GC22 25 35 50 To change the airflow direction When to use this function COOL DRY HEAT Pressing and holding VANE CONTROL button for 2 seconds or more the horizontal vane reverses and moves horizontal position Use this function if you don t want the air from the indoor unit to blow directly onto your b...

Page 16: ...s approx 12 V transmitted from microprocessor 2 The vertical vane angle and mode change as follows by pressing WIDE VANE button 3 Positioning The vane is once pressed to the vane stopper to confirm the standard position and set to the desired angle Confirming of standard position is performed in case of follows a When OPERATE STOP ON OFF button is pressed POWER ON OFF b When SWING is started or fi...

Page 17: ...timer 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 button 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 18: ...ONS for the other models 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 miswiring 2 Take care of the following during servicing 1 Before servicing the air conditioner be sure to turn OFF the main unit first with the remote controller and after confirm ing the horizontal vane is closed turn...

Page 19: ... controller has a circuit to automatically reset the microcomputer when batteries are replaced This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the battery replacement Press RESET button with a thin instrument and then use the remote controller Remove the front lid and insert batteries Then reattach the front lid 2 1 Stopper Lock Left Ins...

Page 20: ...indoor unit is abnormal Check the blinking pattern and confirm the abnormal point with the indoor unit failure mode table Refer to 8 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 controlle...

Page 21: ...haracteristics of the main indoor coil ther mistor the sub indoor coil thermistor 8 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 8 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 emit during the 12 seconds the indoor ...

Page 22: ...ft lamp 2 time flash Cause Indoor unit Trouble of room temperature indoor coil thermistor Upper or left lamp 3 time flash Cause Indoor unit Trouble of indoor fan motor Upper or left lamp 4 time flash Cause Indoor unit Trouble of indoor unit control system Upper or left lamp 5 time flash Cause Outdoor unit Outdoor power system abnormality Upper or left lamp 6 time flash Cause Outdoor unit Trouble o...

Page 23: ... control P C board Replace the indoor electronic control P C board 5 Outdoor power sys tem Upper or left 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 Check the stop valve 6 ...

Page 24: ...35 255 Ω GC60 71 Horizontal vane motor MV1 Vertical vane motor MV2 Measure the resistance between the terminals with a tester Part temperature 20 30 C Color of the lead wire Normal RED BLK 240 260 Ω BLK RED WHT GRY YLW BRN MAIN AUX FUSE or No Abnormal point Operation indicator lamp Symptom Condition Correspondence 1 GC22 25 35 50 Attachment of the hori zontal vane All lamps flash at the same time ...

Page 25: ...r electronic control P C board Yes No Reconnect the lead wires Resolder it Replace the indoor fan motor Yes Are lead wires connected Disconnect the lead wires from connector CN211 on indoor power P C board Measure the resistance between lead wires No 1 and No 4 and then No 4 and No 7 Does the voltage repeat 0 and 5 VDC Are soldered points of the connector correctly soldered to indoor power P C boa...

Page 26: ...o the range of 2 to 6 VDC within 12 seconds after EMERGENCY OPERATION switch is pressed Replace the indoor fan motor Yes No The indoor fan motor error has occurred and the indoor fan repeats 12 second ON and 30 second OFF 3 times and then stops Measure the voltage between CN211 and while the fan motor is rotating Replace the indoor power P C board and the indoor terminal P C board Is it unchanged ...

Page 27: ...between CN211 and If more than 12 seconds passes after EMERGENCY OPERATION switch is pressed the voltage mentioned above 2 goes 0 VDC although the indoor electronic control P C board is normal Is there 311 325 VDC between CN211 and and does the voltage between CN211 and rise to the range of 3 to 6 VDC within 12 seconds after EMERGENCY OPERATION switch is pressed Replace the indoor fan motor CN211 ...

Page 28: ...fer to 8 1 4 Check if the unit operates with the remote controller Yes Does the unit operate with the remote controller Yes OK No Not clear Yes No No Replace the remote controller Replace the receiver P C board 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 No 5 or 0 VDC Yes Replace the indoor el...

Page 29: ...e No Replace the fuse F11 3 Measure the resistance of cement resistor R111 on the indoor power P C board No Is the resistance approx 4 Ω No Replace the indoor power P C board and the indoor terminal P C board and the indoor fan motor Replace the indoor power P C board and the indoor terminal P C board Measure the resistance of the vane motor coil Refer to 8 5 Short circuit Replace the vane motor a...

Page 30: ...ly Replace the varistor NR11 and the fuse F11 Are the varistor NR11 burnt and the fuse F11 blown No No Yes Yes Be sure to check both the fuse and the varistor in any case Is the fuse F11 blown only Measure the resistance between and of the indoor fan motor connector to CN211 on the indoor electronic control P C board 1 2 1 The fan motor connector s lead wire is red whereas is black 2 Connect of th...

Page 31: ...F the power supply Remove the short circuit between out door terminal block S2 and S3 Turn ON the power supply Is there amplitude of 10 to 20 VDC between indoor terminal block S2 and S3 Confirmation of serial signal Is there rated voltage between indoor terminal block S1 and S2 Confirmation of power voltage Yes No Is there any error of the in door outdoor connecting wire such as the damage of the ...

Page 32: ...ntrol P C board repeat 3 6 second OFF and 0 8 second ON quick blinking 3 Yes No Lighted or not lighted Replace the inverter P C board or the outdoor electronic control P C board 2 2 Be careful to the residual voltage of smoothing capacitor Turn OFF the power supply Remove the short circuit between outdoor terminal block S2 and S3 Turn ON the power supply Is there amplitude of 10 to 20 VDC between ...

Page 33: ...e indoor unit Refer to 8 1 5 Turn ON the power supply Are all lamps flashing Yes No Turn OFF the power supply To check the continuity of the interlock switch Fan measure the resistance of connector connected to CN1R1 on the indoor electronic control P C board Is there resistance 0 Ω Yes No Replace the interlock switch Fan Replace the indoor electronic control P C board OK Turn OFF the power supply...

Page 34: ...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 35: ...or to indoor electronic control P C board CN20A 5VDC 12VDC GND Indoor fan motor CN211 220 230V AC Cement resistor R111 CN121 MSZ GC35NA C2 Indoor terminal P C board Indoor power P C board Please replace the fuse after removing the indoor terminal P C board from the electrical box Fuse F11 Varistor NR11 Terminal block Connector to indoor electronic control P C board CN20A 5 VDC 12 VDC GND 3 6 VDC 1...

Page 36: ...ture thermistor RT11 CN111 Indoor coil thermistor RT12 RT13 CN112 Vane motor CN151 Connector to Indoor power P C board CN10A 12 VDC 5 VDC Release of Auto restart function Solder the Jumper wire to JR07 Refer to 6 3 Emergency operation switch E O SW SW1 2 Indoor electronic control P C board MSZ GC22NA MSZ GC25NA MSZ GC35NA GND Interlock switch FAN CN1R1 ...

Page 37: ...rmistor RT12 RT13 CN112 Horizontal vane motor CN151 SW P C board Power monitor receiver P C board 12 VDC 5 VDC Interlock switch Fan CN1R1 Power supply input Indoor fan motor CN211 Varistor NR11 Room temperature thermistor RT11 Timer short mode point JPG JPS Refer to 6 1 3 6 VDC 15 VDC Fiducial terminal of cathode side on measur ing high voltage DC 311 325 VDC 0 or 15 VDC Emergency operation switch...

Page 38: ... Indoor coil thermistor RT12 RT13 CN112 Horizontal vane motor CN151 SW P C board Receiver P C board 12 VDC 5 VDC 3 6 VDC 15 VDC Fiducial terminal of cathode side on meas uring high voltage DC 311 325 VDC Power supply input Indoor fan motor CN211 Varistor NR11 Room temperature thermistor RT11 Timer short mode point JPG JPS Refer to 6 1 Vertical vane motor CN152 Display P C board Emergency operation...

Page 39: ...e indoor electronic control P C board holder 6 Open the back side of the indoor electronic control P C board holder and remove the indoor electronic control P C board 7 Remove the room temperature thermistor from the indoor electronic control P C board Photo 2 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector has the locking mechanism Slide the slee...

Page 40: ... remove the electrical cover 7 Disconnect all the connectors on the indoor power P C board and unhook all lead wires 8 Remove the screw of terminal block on the indoor terminal P C board 9 Remove the indoor power P C board and the indoor termi nal P C board Photo 3 4 Removing the vane motor 1 Turn the breaker OFF 2 Remove the panel refer to 1 and the corner box 3 Remove the indoor electronic contr...

Page 41: ...Remove the screws fixing the motor bed Lift the right side of motor bed a little and pull right to remove the fan motor together with motor band bed 6 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it Photo 7 7 Remove the screws fixing the left side of the heat exchang er 8 Lift the left side of the heat exchanger...

Page 42: ...el 1 Remove the horizontal vane 2 Remove the screw caps of the panel Remove the screws Photo 1 3 Hold the lower part of both ends on the panel and pull it slightly toward you and then remove the panel by pushing it upward Photo 1 Screws of the panel Horizontal vane ...

Page 43: ...11 Remove the earth wire connected to the heat exchanger from the electrical box Photo 4 12 Unhook the catches of the electrical box and pull out the electrical box 13 Remove the screws of the terminal block cover and the ter minal block cover and the terminal block holder Photo 2 14 Remove the terminal block by sliding it Photo 2 Photo 3 Photo 4 3 Removing the electrical box 1 Remove the horizont...

Page 44: ...x Refer to 3 3 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 4 Remove the screws fixing the motor bed Photo 6 5 Loosen the screw fixing the line flow fan Photo 7 6 Remove the motor bed together with fan motor and motor band 7 Release the hooks of the motor band and remove the motor band then pull out the indoor fan motor 8 Remove the screws fixing the left side of...

Page 45: ... control P C board 8 Open the R L holder remove the receiver P C board and the display P C board Photo 2 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 thermistors 4 Disconnect the motor connector CN211 and the vane motor connector CN151 and CN152 on the electronic control P C board 5 Remove t...

Page 46: ...al box Refer to 3 3 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 4 Remove the water cut 5 Slide the hole cover and remove the hole cover Photo 8 6 Remove the hexagon socket set screw from the line flow fan 7 Remove the screws fixing the motor bed and remove the fan motor Be careful not to drop the fan motor because it is heavy Photo 7 8 Remove the screws fixing t...

Page 47: ...47 ...

Page 48: ... 100 8310 JAPAN Copyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Aug 2008 No OBH481 REVISED EDITION A 6 Distributed in Mar 2007 No OBH481 Made in Japan New publication effective Aug 2008 Specifications subject to change without notice TM ...

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