Home

Mitsubishi MUZ-GB50VA Service manual

1. 700 600 9 500 400 300 8 20 100 OS 10 20 30 40 50 60 70 80 90 100 110 120 Temperature C ete RR 9 e lt 9 Nc z 2 SS ag o Zo gt On ba zZ 00 LED 1 LED 2 CN801 325V DC 370V DC Input F801 5 FUSE 250V 3 15A DMOOY44 1 iar 00000000
2. P6603 o0 o 40 CN601 230V AC Serial signal Input Room A 5 10V DC o 8605 0801 C60 34 ceosn_O um eR E z ur Reo2 8 8 ResAReesReecResD Bo 900000000 ON 68 C66B CE6C C660 o o o o c7es oe VY mrm fnm i 6 Fi 4 7 24792 H e RN n mM Las FFL i Jii LJ Lu 7 Z SSS 00000000 000000 000000 000000 000000 9o o o o o o C 2 d cw794 0 ev am 31 _ S S 2 Noise filter P C board MUZ GB50VA CN901 To electronic CN902 CN903 control To power To power P C board board board
3. Z 6NO 8 66 891H Z91H 191 S9LY _ D 2 ES o V 6H E S6 NO 8 viele t elt NE 199NO 99NO c 3 9 2 LOZNO ZOZNO L8ZNO 2 1919 9 Ele JNO THM AEG iE 2 B mo ONILO3NNOO Ii 00 LINN J Ja JA To To sooo Sai 101 92m er Fab Efe 2 MG cic su 8 1 1 DI Te 9998199 o ar L06NO m mimo lt SION N IE e NH u o e Tl one s o E 16 1912 pn zie Ed d Z i vv ru argu 2 E v9X UJ cp EE HE 1 i ZHOS A0 Z N AlddNS H3MOd MUZ GB50VA 7 REFRIGERANT SYSTEM DIAGRAM 1 Unit mm m MUZ GB50VA Muffler Refrigerant pipe 912 7 with heat insulator Stop valve with service p Flared connection Discharge Ambient temperature temperature thermistor Defrost thermistor RT62 thermistor RT65 Compressor Outdoor heat exchanger temperature thermistor LEV R V coil OFF gt Refrigerant flow in cooling ON Refrigerant flow in heating Strainer 100 _ Strainer Receiver 100 Stop valve Ca
4. 230V AC Input CN912 R V coil 230V AC 230V AC eu A Output utpu T NR64 VARISTOR F64 FUSE F911 FUSE 250V 2A 250V 1A 32 3 Outdoor power board MUZ GB50VA 325 370V DC Output Connect to the compressor A Voltage among phases 5V to 180V Connect to the earth CN2 oi St cC 5 Connect to the controller board Q13 zo i issi e 325 370V DC Output 1 5 Signal transmission To electronic control P C board DC pulse wave 2 5 Zero cross signal 3 4 Not used 6 5 15V 7 5 15V CNS3 Fin temperature thermistor RT64 CNi LD8 Signal reception From 3 2 6 t t e electronic control P C board E VD 0000000000 CO G 5V DC pulse wave 9 e 0000000096 CN5 Primary current detection Connect to the noise filter og Connect to the compressor Voltage among phases 5V to 180V Connect to the earth CN2 Connect to the controller board 1 5 Signal transmission To electronic control P C board 5V DC pulse wave 2 5 Zero cross signal 3 4 Not used 4 6 5 15V 7 5 15V CN3 Ko Fin temperature thermistor RT64 Signal reception From electronic control P C board 5V DC pulse wave CN5 Primary current detection Con
5. Deleting the memorized abnormal condition aAfter repairing the unit recall the failure mode again according to Setting up the failure mode recall function mentioned above Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted Release the failure mode recall function according to Releasing the failure mode recall function mentioned above Note1 Make sure to release the failure mode recall function once it s set up otherwise the unit cannot operate properly 2 If the abnormal condition is not deleted from the memory the last abnormal condition is kept memorized 2 pattern when outdoor unit is abnormal Blinking at 0 5 Blinking at 0 5 2 5 second OFF 3 second ON second interval 2 5 second OFF 3 second ON second interval pe LM gt OFF o oo r a No beep pa i No beep i Repeated cycle i Repeated cycle Repeated cycle 17 3 Outdoor unit failure mode table MUZ GB50VA The left lamp of OPERATION INDICATOR lamp Indoor unit Abnormal point Failure mode protection LED in Outdoor dication P C board LED 1 LED2 Condition Correspondence Ind
6. 29 Electromagnetic noise enters into TV sets or radios No Is the unit earthed gt Earth the unit Yes Is the distance between the antennas and the indoor j Extend the distance between Yes unit within 3m or is the the antennas and the indoor distance between the unit and or the antennas and antennas and the outdoor the outdoor unit unit within 3m Is the distance between the TV sets or radios and the Yes Extend the distance between indoor unit within 1m or is the TV sets and or radios and the distance between the TV the indoor unit or the TV sets sets or radios and the outdoor unit within 3m or radios and the outdoor unit Are the antennas damaged Yes Is the coaxial cable damaged Replace or repair the antenna Is there any poor contact in Replace or repair the coaxial cable the antenna wiring E Is the indoor outdoor Yes Extend the distance between connecting wire of the air the indoor outdoor connecting conditioner and the wiring of wire of the air conditioner and the antennas close the wiring of the antennas Even if all of the above conditions are fulfilled the electromagnetic noise may enter depending on the electric field strength or the installation condition combination of specific conditions such as antennas or wiring Check the followings before asking for service 1 Devices affected by
7. Measure the resistance between terminals using a tester Winding temperature 10 C 40 bd Compressor Normal 0 40 Q 0 49 Q WHT BLK Measure the resistance between lead wires using a tester Part temperature 10 C 40 C Outdoor fan motor Color of lead wire Normal RED BLK BLK WHT 13 4Q 16 4 Q WHT RED Measure the resistance using a tester Part temperature 10 C 40 C R V coil Normal 2 6 KQ 3 3 Measure the resistance using a tester Part temperature 10 C 40 C Color of lead wire Normal RED 360 Linear expansion valve WHT RED ORN RED ORN YLW BAN 37 4 Q 53 9 Q BRN BLU YLW BRN BLU 23 _ S 10 6 Troubleshooting flow MUZ GB50VA How to check inverter compressor Disconnect the terminal of the compressor 3 minutes after turning on the power supply start EMERGENCY OPERATION Y x Measure the voltage between each lead wire leading to the compressor U BLK V WHT V WHT W RED W RED U BLK Is voltage output on right table After the outdoor fan starts running wait for 1 minute or more before measuring the voltage The output voltage values have the tolerance of 20 No 122V 154V 74V 126V 56Hz 71Hz 80Hz 58Hz Yes v d Is output balanced gt No Yes v Is t
8. The standard specifications apply only to the operation of the air conditioner under normal conditions Since operating condi tions vary according to the areas where these units are installed the following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve 1 GUARANTEED VOLTAGE 198 264V 50Hz 2 AIR FLOW Air flow should be set at MAX 3 MAIN READINGS 1 Indoor intake air wet bulb temperature C WB 2 Indoor outlet air wet bulb temperature C WB Cooling 8 Outdoor intake air dry bulb temperature C DB 4 Total input 5 Indoor intake air dry bulb temperature C DB Heating 6 Outdoor intake air wet bulb temperature C WB 7 Total input W Indoor air wet dry bulb temperature difference on the left side of the following chart shows the difference between the indoor intake air wet dry bulb temperature and the indoor outlet air wet dry bulb temperature for your reference at service How to measure the indoor air wet bulb dry bulb temperature difference 1 Attach at least 2 sets of wet and dry bulb thermometers to the indoor air intake as shown in the figure and at least 2 sets of wet and dry bulb thermometers to the indoor air outlet The thermometers must be attached to the position where air speed is high Attach at least 2 sets of wet and dry bulb thermometers to the outdoor air intake Cover the
9. 1436 6 15 4 37 0 71 1526 6 00 4 26 0 71 1568 5 75 4 08 0 71 1634 32 24 6 70 3 95 0 59 1502 6 45 3 81 0 59 1584 6 30 3 72 0 59 1634 6 10 3 60 0 59 1716 32 26 6 90 3 24 0 47 1584 _ 6 70 3 15 0 47 1667 6 60 3 10 0 47 1716 6 40 3 01 0 47 1766 NOTE Total capacity kW SHF Sensible heat factor DB Dry bulb temperature SHC Sensible heat capacity kW INPUT Total power input W WB Wet bulb temperature 12 i PERFORMANCE DATA COOL operation at Rated frequency MSZ GB50VA MUZ GB50VA CAPACITY 5 0 KW SHF 0 69 INPUT 1650 W OUTDOOR DB C INDOOR INDOOR 35 40 43 DB C WB C a sHc sHF INPUT sHC sHF INPUT SHC SHF INPUT 21 18 4 90 2 50 0 51 1617 4 50 2 30 0 51 1716 4 30 2 19 0 51 1749 21 20 1 5 15 2 01 0 39 1683 4 80 1 87 0 39 1766 4 60 1 79 0 39 1815 22 18 4 90 2 70 0 55 1617 4 50 2 48 0 55 1716 4 30 2 37 0 55 1749 22 20 5 15 2 21 0 43 1683 4 80 2 06 0 43 1766 4 60 1 98 0 43 1815 22 22_ 5 45 1 69 0 31 1749 5 101 1 58 0 31 1848 4 90 1 52 0 31 1881 23 18 4 90 2 89 0 59 1617 4 50 2 66 0 59 1716 4 30 2 54 0 59 1749 23 20 5 15 2 42 0 47 1683 4 801 2 26 0 47 1766 4 60 2 16 O 47 1815 28 22 5 45 1 91 0 35 1749 5 10 1 79 0 35 1848 4 90 1 72 0 35 1881 24
10. 2013 28 18 4 90 3 87 0 79 1617 4 50 3 56 0 79 1716 4 30 3 40 0 79 1749 28 20 5 15 3 45 0 67 1683 4 80 3 22 0 67 1766 4 60 3 08 0 67 1815 28 22 5 45 3 00 0 55 1749 5 10 2 81 0 55 1848 4 90 2 70 0 55 1881 28 24 5 75 2 47 0 43 1815 15 40 2 32 0 43 1898 5 25 1 00 0 19 1947 28 26 6 05 1 88 0 31 1881 5 70 1 77 0 31 1964 5 50 1 71 0 31 2013 29 18 4 90 4 07 0 83 1617 4 50 3 74 0 83 1716 4 30 3 57 0 83 1749 29 20 5 15 3 66 10 71 1683 4 80 3 41 10 71 1766 4 60 3 27 0 71 1815 29 22 5 45 3 22 0 59 1749 5 10 3 010 59 1848 4 90 2 89 0 59 1881 29 24 5 75 2 70 10 47 1815 15 40 2 54 0 47 1898 5 25 0 89 0 17 1947 29 26 16 05 2 12 0 35 1881 5 70 2 00 0 35 1964 5 50 1 93 0 35 2013 30 18 4 90 4 26 0 87 1617 4 50 3 92 0 87 1716 4 30 3 74 0 87 1749 30 20 5 15 13 86 0 75 1683 4 80 3 60 0 75 1766 4 60 3 45 0 75 1815 30 22 5 45 3 43 0 63 1749 5 10 3 21 0 63 1848 4 90 3 09 0 63 1881 30 24 5 75 2 93 10 51 1815 15 40 2 75 0 51 1898 5 25 0 79 0 15 1947 30 26 16 05 2 36 0 39 1881 5 70 2 22 0 39 1964 5 50 2 15 0 39 2013 31 18 4 90 4 46 0 91 1617 4 50 4 10 0 91 1716 4 30 3 91 0 91 1749 31 20 5 15 4 07 0 79 1683 4 80 3 79 0 79 1766 4 60 3 63 0 79 1815 31 22 5 45 3 65 0 67
11. a 23 4 limes Lightin Low discharge temperature is kept under 39 C for more than 20 minutes Refer to 10 6 6 Check of LEV gning temperature protection Check refrigerant circuit and refrigerant amount This symptom does not mean any abnormality of the m a heck the following points Cooling high pressure The outdoor heat exchanger temperature exceeds 58 C pons Dut 2190 neces 24 5 times Lighting protection duri n Check if indoor filters are clogged ung Operation Check if refrigerant is short Check if indoor outdoor unit air circulation is short cycled Outdoor unit 25 operates 9 times Lighting Inverter check mode The unit is operated with emergency operation switch 26 Lighting Lighting Normal 22 10 5 Trouble criterion of main parts MUZ GB50VA Part name Check method and criterion Defrost thermistor 1 RT61 Measure the resistance with a tester Ambient temperature Refer to 10 7 Test point diagram and voltage 1 Outdoor electronic thermistor RT65 control P C board the chart of thermistor Outdoor heat exchanger temperature thermistor RT68 Discharge temperature Measure the resistance with a tester thermistor RT62 Before measurement hold the thermistor with your hands to warm it up Fin temperature Refer to 10 7 Test point diagram and voltage 1 Outdoor electronic thermistor RT64 control P C board the chart of thermistor
12. 1469 5 70 3 59 0 63 1502 5 50 3 47 0 63 1568 27 22 6 88 3 25 0 51 1436 6 15 3 14 0 51 1526 6 00 3 06 0 51 1568 5 75 2 93 0 51 1634 27 24 6 70 2 61 0 39 1502 6 45 2 52 0 39 1584 6 30 2 46 0 39 1634 6 10 2 38 0 39 1716 27 26 6 90 1 86 0 27 1584 6 70 1 81 0 27 1667 6 60 1 78 0 27 1716 6 40 1 73 0 27 1766 28 18 5 88 4 64 0 79 1320 5 63 4 44 0 79 1386 5 40 4 27 0 79 1452 5 20 4 11 0 79 1518 28 20 6 13 4 10 0 67 1386 5 88 3 94 0 67 1469 5 70 3 82 0 67 1502 5 50 3 69 0 67 1568 28 22 6 38 3 51 0 55 1436 6 15 3 38 0 55 1526 6 00 3 30 0 55 1568 5 75 3 16 0 55 1634 28 24 16 70 2 88 0 43 1502 6 45 2 77 0 43 1584 6 30 2 71 0 43 1634 6 10 2 62 0 43 1716 28 26 6 90 2 14 0 31 1584 6 70 2 08 0 31 1667 6 60 2 05 0 31 1716 6 40 1 98 0 31 1766 29 18 5 88 4 88 0 83 1320 5 63 4 67 0 83 1386 5 40 4 48 0 83 1452 5 20 4 32 0 83 1518 29 20 6 13 4 35 0 71 1386 5 88 4 17 0 71 1469 5 70 4 05 0 71 1502 5 50 3 91 0 71 1568 29 22 6 38 3 76 0 59 1436 6 15 3 63 0 59 1526 6 00 3 54 0 59 1568 5 75 3 39 0 59 1634 29 24 6 70 3 15 0 47 1502 6 45 3 03 0 47 1584 6 30 2 96 0 47 1634 6 10 2 87 0 47 1716 29 26 6 90 2 42 0 35 1584 6 70 2 35 0 35 1667 6 60 2 31 0 35
13. 1749 5 10 3 42 0 67 1848 4 90 3 28 0 67 1881 31 24 5 75 3 16 0 55 1815 5 40 2 97 0 55 1898 5 25 0 68 0 13 1947 31 26 6 05 2 60 0 43 1881 5 70 2 45 0 43 1964 5 50 2 37 0 43 2013 32 18 4 90 4 66 0 95 1617 4 50 4 28 0 95 1716 4 30 4 09 0 95 1749 32 20 5 15 4 27 0 83 1683 4 80 3 98 0 83 1766 4 60 3 82 0 83 1815 32 22 5 45 3 87 0 71 1749 5 10 3 62 0 71 1848 4 90 3 48 0 71 1881 32 24 5 75 3 39 0 59 1815 5 40 3 19 0 59 1898 5 25 0 58 0 11 1947 32 26 6 05 2 84 0 47 1881 5 70 2 68 0 47 1964 5 50 2 59 0 47 2013 NOTE Total capacity kW SHF Sensible heat factor DB Dry bulb temperature SHC Sensible heat capacity KW INPUT Total power input W WB Wet bulb temperature 13 PERFORMANCE DATA HEAT operation at Rated frequency MSZ GB50VA MUZ GB50VA CAPACITY 5 8 kW INPUT 1700 W OUTDOOR WB C INDOOR 10 5 0 5 10 15 20 DB C Q INPUT Q INPUT INPUT INPUT INPUT Q INPUT 15 3 65 1105 4 41 1326 5 16 1496 5 92 1615 6 67 1717 7 37 1768 8 12 1802 21 3 48 1190 4 18 1411 4 93 1564 5 63 1683 6 38 1768 7 08 1819 7 80 1887 26 3 13 1275 3 89 1496 4 58 1649 5 34 1768 6 09 1853 6 79 1904 7 54 1955 NOTE Total capacity KW INPUT
14. 26 20 4 18 5 16 7 14 8 13 0 0 7 2 2 11 1 0 6 za s X ess 1 0 m V 1 9 i 0 9 e dei Ne LAE TL NN Ai X 0 8 409 c eter Le 1 1 difference Input correction factors Capacity correction factors Indoor air Dry bulb temperature 10 5 0 5 10 15 10 5 0 5 10 15 Outdoor intake air Wet bulb temperature C Outdoor intake air Wet bulb temperature MSZ GB50VA MUZ GB50VA NOTE The above broken lines are for the heating operation without any frost and defrost operation at Rated frequency 8 2 Capacity and input correction by operational frequency of compressor MUZ GB50VA i Correction of Cooling capacity Correction of Cooling total input is Correction of Heating capacity 5 of Heating total input 2 o g 2 5 8 2 8 15 i 5 1 0 z 1 0 5 1 0 o E 8 3 go o Q x E 20 5 A 805 205 4 8 5 a MEN c 0 0 0 0 1 1 1 50 0 50 00 5042 0 50 100 1 50 The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor 8 3 Test run operation How to operate fi
15. 5 OPERATION switch eee board es Open Replace the outdoor place the power P C board Does the rush current Yes electronic control P C SMS X64 WOIK board or power P C board ly HE propery or the compressor No Replace the noise filter P C board Check other electric parts in the main circuit together in the case that the current limiting resistor is defective When cooling heat exchanger of non operating indoor unit frosts When heating non operating indoor unit gets warm Check of LEV Turn on power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely Is click click sound heard Or do you feel vibration of the LEV coil with hands Disconnect the connector CN795 Is there normal resistance to LEV coil Replace the outdoor electronic control P C board Replace the LEV coil 28 When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch Indoor unit does not operate When OPERATION INDICATOR lamp flashes ON and OFF every 0 5 second Outdoor unit doesn t operate How to check miswiring and serial signal error when outdoor unit does not work C Turn OFF the power supply 4 Is there rated voltage in No Check the power the power supply supply 4 Yes Turn ON the power supply Y Is there rated voltage between No outd
16. Discharge temperature Between CN661 pin3 and pin4 Outdoor heat exchanger temperature Between CN661 pin7 and pin8 OutdoorelectronicContolP G Dord Ambient temperature Between CN663 pin1 and pin2 Fin temperature Between CN3 pin1 and pin2 Outdoor power board 25 The cooling operation or heating operation does not operate LED display Both LED1 and LED lighting Check of R V coil When heating operation does not work 1 Disconnect the lead wire leading to the compressor 2 3 minutes after turning on the power supply start EMERGENCY OPERATION in HEAT mode t Is there voltage of 230V AC between pin1 and 1 Turn off power supply of indoor and outdoor unit and pin 2 at connector CN912 x disconnect the connector CN781 in the outdoor electronic control P C board 2 3 minutes after turning on the power supply start Turn off power supply of indoor and outdoor unit EMERGENCY OPERATION in HEAT mode Disconnect the connector Is there voltage 12V DC CN912 in noise filter P C No between the connector CN781 board Is there normal Me eno um control P C board pin 5 and pin 3 resistance to R V coil No Replace the electronic J Yes Replace the noise filter P C board Replace the 4 way valve J Yes Replace the 4 way valve When cooling operation does not work 1 Disconnect the lead wire
17. PS21661 RZ Reactor 340uH 20A Power factor controller PFC PS51259 A Resistor R64A B 100 10W Resistor R937A B 1 10 2W 296 Resistor RS1 4 0 04Q 7W Solenoid coil relay SSR61 TLP3506 Terminal block TB1 3P Terminal block TB2 3P Relay X64 G4A R V coil 21S4 LD30013 4 NOISE CRITERIA CURVES MUZ GB50VA FAN SPEED FUNCTION SPL dB A LINE Mh COOLING 52 e e HEATING 55 0 o0 90 80 8 t oi 4 E 60 OCTAVE BAND SOUND PRESSURE LEVEL 0dB 50 Test conditions Cooling Dry bulb temperature 35 C Wet bulb temperature 24C 40 Heating Dry bulb temperature 7 Wet bulb temperature 6 C OUTDOOR UNIT 30 i 18 1 20 _ APPROXIMATE MICROPHONE THRESHOLD OF HEARING FOR CONTINUOUS NOISE Md 63 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz MUZ GB50VA li DO 2 2 ES AN SS Gi 9 OUTLINES AND DIMENSIONS Unit mm REQUIRED SPACE Open as a rule 500 mm or more if the front and both sides are open 100 mm or more 200 mm or more if there are obstacles to both sides Open as a rule 500 mm or more if the back both sides and top are open 350 mm or more Service panel Liquid refrigerant pipe joint Refrigeran
18. 2 mec 8 e e 2 55 Ee D5 9 C2 59 5 SE 59 9 oF 29 otc u of g O5 5 g 52 92 89 5 oa o 5E a AAS OL 200 Defrost thermistor RT61 Ambient temperature thermistor RT65 Fin temperature thermistor RT64 Outdoor heat exchanger temperature thermistor RT68 Temperature 100 180 5 _ 160 80 S 140 S 120 70 t E 100 S 60 E E 9 50 6 40 40 20 30 0 20 0 10 20 30 40 50 60 70 80 Temperature 10 oo a 5 9 cas E uos 985 O as 2as L 90099 Oz Ox T gt 22020 058 Dc amp Soz a SS S os a of 2 o5 3 SOBER ott g o 2 555 To gt 5229 zor 259 nS zoo OO io 2 Ora 2 Ta E ss vq LE TTE gt gt 204w OL
19. 51 1469 5 70 2 91 0 51 1502 5 50 2 81 0 51 1568 24 22 6 38 2 49 0 39 1436 6 15 2 40 0 39 1526 6 00 2 34 0 39 1568 5 75 2 24 0 39 1634 24 24 6 70 1 81 0 27 1502 6 45 1 74 0 27 1584 6 30 1 70 0 27 1634 6 10 1 65 0 27 1716 25 18 5 88 3 94 0 67 1320 5 63 3 77 0 67 1386 5 40 3 62 0 67 1452 5 20 3 48 0 67 1518 25 20 6 13 3 37 0 55 1386 5 88 3 23 0 55 1469 5 70 3 14 0 55 1502 5 50 3 03 0 55 1568 25 22 6 38 2 74 0 43 1436 6 15 2 64 0 43 1526 6 00 2 58 0 43 1568 5 75 2 47 0 43 1634 25 24 6 70 2 08 0 31 1502 6 45 2 00 0 31 1584 6 30 1 95 0 31 1634 6 10 1 89 0 31 1716 26 18 5 88 4 17 0 71 1320 5 63 3 99 0 71 1386 5 40 3 83 0 71 1452 5 20 3 69 0 71 1518 26 20 6 13 3 61 0 59 1386 5 88 3 47 0 59 1469 5 70 3 36 0 59 1502 5 50 3 25 0 59 1568 26 22 6 38 3 00 0 47 1436 6 15 2 89 0 47 1526 6 00 2 82 0 47 1568 5 75 2 70 0 47 1634 26 24 16 70 2 35 0 35 1502 6 45 2 26 0 35 1584 6 30 2 21 0 35 1634 6 10 12 14 0 35 1716 26 26 6 90 1 59 0 23 1584 6 70 1 54 0 23 1667 6 60 1 52 0 23 1716 6 40 1 47 0 23 1766 27 18 5 88 4 41 0 75 1320 5 63 4 22 0 75 1386 5 40 4 05 0 75 1452 5 20 3 90 0 75 1518 27 20 6 13 3 86 0 63 1386 5 88 3 70 0 63
20. Total power input W DB Dry bulb temperature WB Wet bulb temperature 9 ACTUATOR CONTROL MUZ GB50VA 9 1 Outdoor fan motor control The fan motor turns ON OFF interlocking with the compressor ON The fan motor turns ON 5 seconds before the compressor starts up OFF The fan motor turns OFF 15 seconds after the compressor has stopped running 5 seconds 15 seconds gt Compressor OFF ON Outdoor fan motor OFF 9 2 R V coil control Heating was salsa Gy dei ay acca ee BYE ON Cooling E EA a at ee OFF Dry ha Bap y hae eR E A A er OFF NOTE The 4 way valve reverses for 5 seconds right before start up of the compressor lt COOL gt lt HEAT gt 5 seconds 5 seconds 1 ON T t cd ompressor OFF 1 ON Outdoor fan ON i motor OFF 14 9 3 Relation between main sensor and actuator Actuator Outdoor Compressor LEV amp motor Sensor Purpose R V coil Discharge temperature thermistor Protection Indoor pipe temperature thermistor Defrosting Protection Defrost thermistor Defrosting e Outdoor heat exchanger temperature Protection O Fin temperature thermistor Protection Q Ambient temperature thermistor Protection 10 T
21. cannot be read properly Replace the outdoor electronic control P C board Lightning 8times Current sensor Current sensor protection stop is continuously performed twice Replace the power board ightnin 11 times Communication error The communication protection stop between boards is continuously Check the connecting wire between outdoor electronic control between P C boards performed twice P C board and power board ohiri ave The protection stop of the zero cross detecting circuit is continuously Check the connecting wire among outdoor electronic control AUN 2 Zero cross detecting circui performed 10 times P C board noise filter P C board and power board Outdoor unit stops and IPM orotection Overcurrent is detected after 30 minutes of compressor start up Reconnect compressor connector restarts 3 p Refer to 10 6 How to check inverter compressor minutes Twice Goes out Check the stop valve repeated Lock protection Overcurrent is detected within 30 minutes of compressor start up Check the power module PAM module 3 times Goes oli Discharge temperature Discharge temperature exceeds 116 C during operation and compressor _ Check the amount of gas and refrigerant circuit protection stops Compressor can restart if discharge temperature thermistor reads Refer to 10 6 Check of LEV 100 C or less 3 minutes later Fin temperature protection The fin temperature exceeds 87 C during operation Check refrig
22. fan motor rotate smoothly Yes Replace the outdoor electronic control P C board Outdoor unit does not operate LED display display OFF Check of power supply Replace the outdoor DC fan motor Check the connecting of parts of main power supply circuit Turn on power supply Is there voltage of 230V AC in the No power supply terminal block Check the power supply cable Yes Replace the noise Is fuse F64 bown NO ate PC board Is the output voltage from the noise Yes filter P C board 230V AC Replace the fuse Replace the reactor Is the input voltage to the power board 230V AC Is the input voltage to the outdoor electronic control P C board 325V DC Replace the power board Yes Replace the outdoor electronic control P C board 27 Outdoor unit does not operate at all or stops immediately due to overcurrent Check of current limiting resistor When the current limiting resistor is open the rush current limiting relay X64 may not work properly Is the resistance of current limiting Not Turn ON the power Replace the noise filter resistor R64A or R64B on the open supply and press ar Dees PED On N board or the outdoor pines electronic control P C board noise filter P C board normal EMERGENCY light up electronic control P C Normal resistance 100
23. of this mode differ from the ones of Troubleshooting check table 10 4 18 The left lamp of OPERATION INDICATOR lamp Indoor unit Abnormal point Failure mode protection LED indication Outdoor P C board LED 1 LED2 Condition Correspondence Indoor outdoor unit failure mode recall function 11 time flash Communication error between P C boards Lighting 6 times Communication error occurs between the electronic control P C board and power board for more than 10 seconds The communication between boards protection stop is continuously performed twice Check the connecting wire between outdoor electronic control P C board and power board Current sensor Lighting 7 times A short or open circuit is detected in the current sensor during compressor operating Current sensor protection stop is continuously performed twice Replace the power board Zero cross detecting circuit Zero cross signal cannot be detected while the compressor is operating The protection stop of the zero cross detecting circuit is continuously performed 10 times Check the connecting wire among electronic control P C board noise filter P C board and power board Converter A failure is detected in the operation of the converter during operation Bus bar voltage 1 The bus bar voltage exceeds 400V or falls to 200V or below during compressor
24. operating Bus bar voltage 2 Even if this protection stop is performed continuously 3 times it does not mean the abnormality in outdoor power system The bus bar voltage exceeds 400V or falls to 50V or below during compressor operating Replace the power board NOTE Blinking patterns of this mode differ from the ones of Troubleshooting check table 10 4 19 _ S 10 3 Instruction of troubleshooting Indoor unit operates Outdoor unit doesn t operate Indoor unit opera Outdoor unit doesn t operate normally Indoor unit tes doesn t receive the signal from remote controller OPERATION INDICATOR lamp on the indoor unit is flashing on and off Outdoor unit operates only in Test Run operation Refer to 8 3 Outdoor unit doesn t operate even in Test Run operation Refer to 8 3 Unit doesn t operate normal operation in COOL or HEAT mode Indoor unit Indoor unit operates when doesn t operate EMERGENCY when OPERATION EMERGENCY switch is pressed OPERATION switch is pressed If blinking of OPERATION INDICATOR lamp cannot be checked it can be checked with failure mode recall function Test Run operation means the operation within 30 minutes after EMERGENCY OPERATION switch is pressed C
25. parts Deleting the memorized abnormal condition repairing the unit recall the failure mode again according to Setting up the failure mode recall function mentioned above Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted Release the failure mode recall function according to Releasing the failure mode recall function mentioned above Note1 Make sure to release the failure mode recall function once it s set up otherwise the unit cannot operate properly 2 If the abnormal condition is not deleted from the memory the last abnormal condition is kept memorized 3 2 Blinking pattern when the indoor unit is abnormal Blinking at 0 5 Blinking at 0 5 QE second OFF gecond interval p Second OFF gecond interval p Qo o SPESE ri r mS OFF gt 7 ap Ver lt gt lt gt lt Beeps pa Beeps Repeated cycle Repeated cycle d Repeated cycle 3 X3 Blinking pattern when the outdoor unit is abnormal PERA Blinking at 0 5 Blinking at 0 5 second interval 25 second OFF a 3 second ON poe second interval 25 second a 3 second ON p gt uq ee imp a No beep i No beep Beeps Repeated cycle Repeated cycle 4 Repeated cy
26. performance C O 3 03 3 41 Model SNB130FLDH or SNB130FLDH1 SNB130FLEH1 Output 850 Winding U V 0 45 W U 0 45 resistance at 20 C V W 0 45 Model RC0J60 AA BLK WHT 15 2 WHT RED 15 2 RED BLK 15 2 Dimensions WxHxD 840x850x330 Weight 53 Sound level 1 High Low 52 51 55 53 Fan speed High Low 800 480 800 620 Fan speed regulator Refrigerant filling capacity R410A Refrigeration oil Model n 45 wo o o Electrical Compressor Winding resistance at 20C motor NOTE Test conditions are based on ISO 5151 Cooling Indoor Dry bulb temperature 27 C Wet bulb temperature 19 C Outdoor Dry bulb temperature 35 C Wet bulb temperature 24 C Heating Indoor Dry bulb temperature 20 C Wet bulb temperature 15 C Outdoor Dry bulb temperature 7 C Wet bulb temperature 6 Refrigerant piping length one way 5m 1 Measured under rated operating frequency Specifications and rating conditions of main electric parts Item MUZ GB50VA Current transformer CT1 2 ETQ19Z68AY Current transformer CT61 ETQ19Z53AY Smoothing capacitor CB1 2 3 5604F 450V Fuse F64 250V 2A Fuse F801 250V 3 15A Fuse F911 250V 1A Expansion valve coil LEV CAM MD12ME Intelligent power module IPM PS21244 A Intelligent power module HC930
27. 1716 6 40 2 24 0 35 1766 30 18 5 88 5 11 0 87 1320 5 63 4 89 0 87 1386 5 40 4 70 0 87 1452 5 20 4 52 0 87 1518 30 20 6 13 4 59 0 75 1386 5 88 4 41 0 75 1469 5 70 4 28 0 75 1502 5 50 4 13 0 75 1568 30 22 6 38 4 02 0 63 1436 6 15 3 87 0 63 1526 6 00 3 78 0 63 1568 5 75 3 62 0 63 1634 30 24 16 70 3 42 0 51 1502 6 45 3 29 0 51 1584 6 30 3 21 0 51 1634 6 10 3 11 0 51 1716 30 26 _ 6 90 2 69 0 39 1584 6 70 2 61 0 39 1667 _ 6 60 2 57 0 39 1716 6 40 2 50 0 39 1766 31 18 5 88 5 35 0 91 1320 5 63 5 12 0 91 1386 5 40 4 91 0 91 1452 5 20 4 73 0 91 1518 31 20 6 13 4 84 0 79 1386 5 88 4 64 0 79 1469 5 70 4 50 0 79 1502 5 50 4 35 0 79 1568 31 22 6 38 4 27 0 67 1436 6 15 4 12 0 67 1526 6 00 4 02 0 67 1568 5 75 3 85 0 67 1634 31 24 6 70 3 69 0 55 1502 6 45 3 55 0 55 1584 6 30 3 47 0 55 1634 6 10 3 36 0 55 1716 31 26 6 90 2 97 0 43 1584 6 70 2 88 0 43 1667 6 60 2 84 0 43 1716 6 40 2 75 0 43 1766 32 18 5 88 5 58 0 95 1320 5 63 5 34 0 95 1386 5 40 5 13 0 95 1452 5 20 4 94 0 95 1518 32 20 6 13 5 08 0 83 1386 5 88 4 88 0 83 1469 5 70 4 73 0 83 1502 5 50 4 57 0 83 1568 32 22 6 38 4 53 0 71
28. 18 4 90 3 09 0 63 1617 4 50 2 84 0 63 1716 4 30 2 71 0 63 1749 24 20 5 15 2 63 10 51 1683 4 80 2 45 0 51 1766 4 60 2 35 0 51 1815 24 22 5 45 2 13 0 39 1749 5 10 1 99 0 39 1848 4 90 1 91 0 39 1881 24 24 5 75 1 55 0 27 1815 5 40 1 46 0 27 1898 5 25 1 42 0 27 1947 25 18 4 90 3 28 0 67 1617 4 50 3 02 0 67 1716 4 30 2 88 0 67 1749 25 20 5 15 2 83 0 55 1683 4 80 2 64 0 55 1766 4 60 2 53 0 55 1815 25 22 5 45 2 34 0 43 1749 15 101 2 19 0 43 1848 4 90 2 11 0 43 1881 25 24 5 75 1 78 0 31 1815 5 40 1 67 0 31 1898 5 25 1 31 0 25 1947 26 18 4 90 3 48 0 71 1617 4 50 3 20 0 71 1716 4 30 3 05 0 71 1749 26 20 5 15 3 04 0 59 1683 4 80 2 83 0 59 1766 4 60 2 71 0 59 1815 26 22 5 45 2 56 0 47 1749 5 101 2 40 0 47 1848 4 90 2 30 0 47 1881 26 24 5 75 2 01 0 35 1815 15 40 1 89 0 35 1898 5 25 1 21 0 23 1947 26 26 6 05 1 39 0 23 1881 5 70 1 31 0 23 1964 5 50 1 27 0 23 2013 27 18 4 90 3 68 0 75 1617 4 50 13 38 0 75 1716 4 30 3 23 0 75 1749 27 20 5 15 3 24 0 63 1683 4 80 3 02 0 63 1766 4 60 2 90 0 63 1815 27 22 545 2 78 0 51 1749 5 10 2 60 0 51 1848 4 90 2 50 0 51 1881 27 24 5 75 2 24 0 39 1815 5 40 2 11 0 39 1898 5 25 1 10 0 21 1947 27 26 6 05 1 63 0 27 1881 5 70 1 54 0 27 1964 5 50 1 49 0 27
29. 5 20 0 Wet bulb temperature C 14 5 6 12 14 5 Operation TEST RUN OPERATION refer to 8 3 Outdoor unit current A MUZ GB50VA 4 02 5 10 15 20 25 C Ambient temperature C 11 PERFORMANCE DATA COOL operation at Rated frequency MSZ GB50VA MUZ GB50VA CAPACITY 5 0 kW SHF 0 69 INPUT 1650 W OUTDOOR DB C INDOOR INDOOR 21 25 27 30 DB C WB C a sHc sHF INPUT sHC sHF INPUT sHC sHF INPUT SHC SHF INPUT 21 18 5 88 3 00 0 51 1320 5 63 2 87 0 51 1386 5 40 2 75 0 51 1452 5 20 2 65 0 51 1518 21 20 6 13 2 39 0 39 1386 5 88 2 29 0 39 1469 5 70 2 22 0 39 1502 5 50 2 15 0 39 1568 22 18 5 88 3 23 0 55 1320 5 63 3 09 0 55 1386 5 40 2 97 0 55 1452 5 20 2 86 0 55 1518 22 20 6 13 2 63 0 43 1386 5 88 2 53 0 43 1469 5 70 2 45 0 43 1502 5 50 2 37 0 43 1568 22 22 6 38 1 98 0 31 1436 6 15 1 91 0 31 1526 6 00 1 86 0 31 1568 5 75 1 78 0 31 1634 23 18 5 88 3 47 0 59 1320 5 63 3 32 0 59 1386 5 40 3 19 0 59 1452 5 20 3 07 0 59 1518 23 20 6 13 2 88 0 47 1386 5 88 2 76 0 47 1469 5 70 2 68 0 47 1502 5 50 2 59 0 47 1568 23 22 16 38 2 23 0 35 1436 6 15 2 15 0 35 1526 6 00 2 10 0 35 1568 _ 5 75 2 01 0 35 1634 24 18 5 88 3 70 0 63 1320 5 63 3 54 0 63 1386 5 40 3 40 0 63 1452 5 20 3 28 0 63 1518 24 20 6 13 3 12 0 51 1386 5 88 3 00 0
30. MITSUBISHI ELECTRIC SPLIT TYPE HEAT PUMP AIR CONDITIONERS OUTDOOR UNIT SERVICE MANUAL Wireless type Models MUZ GB50VA MUZ GB50VA m m 2 Changes for the Better Revision D RoHS PARTS LIST has been changed Please void OB455 REVISED EDITION C HFC No OB455 utilized REVISED EDITION D R410A Indoor unit service manual MSZ GB VA Series OB454 Refrigerant service manual R410A REFRIGERANT OBRO01 CONTENTS 1 TECHNICAL CHANGES nnns 2 2 PART NAMES AND 3 4 SBECIEICATION 3 4 NOISE CRITERIA 4 ER 5 OUTLINES AND DIMENSIONS 5 6 WIRING DIAGRAM ntn 6 7 REFRIGERANT SYSTEM 7 8 PERFORMANCE 9 SS 9 ACTUATOR 14 10 TROUBLESHOOTING nns 15 11 DISASSEMBLY 34 12 HOHS PARTS EIST 38 NOTE This service manual describes technical data of the outdoor units Revision Compressor has been changed Mode RoHS PARTS LIST number SNB130FLDH E12 851 900 SNB130FLDH1 E12 939 900 Revision B REFRIGERANT SYSTEM DIAGRAM has been change
31. ROUBLESHOOTING MUZ GB50VA 10 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 then after con firming the horizontal vane is closed turn off the breaker and or disconnect the power plug 2 Be sure to turn OFF the power supply before removing the front panel the cabinet the top panel and the electronic control P C board 3 When removing the electrical parts be careful to the residual voltage of smoothing capacitor 4 When removing the electronic control P C board hold the edge of the board with care NOT to apply stress on the components 5 When connecting or disconnecting the connectors hold the housing of the connector DO NOT pull the lead wires X 85 Lead wiring Housing point 3 Troubleshooting procedure 1 First check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality To make sure check how many times the abnormality indication is flashing on and off before starting service work 2 Before servicing check that the connector and terminal are connected properly 3 When the electronic control P C board seems to be defective check the copper foil pattern for disconnection and the comp
32. VA 12 1 OUTDOOR UNIT STRUCTURAL PARTS ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration Symbol Q ty unit Part No Part Name in Wiring MUZ GB50VA Remarks Diagram z e m m E12 819 297 PANEL E12 851 630 OUTDOOR HEAT EXCHANGER E12 938 301 OUTDOOR FAN MOTOR E12 851 501 PROPELLER E12 851 290 BASE E12 819 232 CABINET E12 819 009 HANDLE E12 819 521 FAN GUARD E12 C34 506 COMPRESSOR RUBBER SET E12 939 900 COMPRESSOR E12 C06 900 COMPRESSOR E12 851 661 STOP VALVE GAS E12 821 662 STOP VALVE LIQUID E12 851 640 EXPANSION VALVE E12 851 493 EXPANSION VALVE COIL E12 935 490 R V COIL E12 891 961 4 WAY VALVE E12 819 650 VALVE COVER E12 819 245 SERVICE PANEL E12 C95 450 OUTDOOR ELECTRONIC CONTROL P C BOARD E12 935 374 TERMINAL BLOCK E12 823 375 TERMINAL BLOCK TB2 E12 A87 337 REACTOR L E12 935 444 NOISE FILTER P C BOARD E12 935 309 AMBIENT TEMPERATURE THERMISTOR RT65 E12 851 308 THERMISTOR SET RT61 RT62 RT68 E12 935 440 POWER BOARD E12 819 233 BACK PANEL OUT E12 817 009 HANDLE E12 851 515 MOTOR SUPPORT E12 127 382 FUSE F801 E12 737 382 FUSE F911 E12 935 385 FUSE amp VARISTOR F64 NR64 E12 851 936 CAPILLARY TUBE TAPER PIPE E12 853 299 OIL SEPARATOR E12 861 CAPILLARY TUBE RC0J60 A h h h mb mh
33. amh h md 3RUBBERS SET SNB130FLDH1 SNB130FLEH1 12 7 6 35 ee h ee 3P 3P DEFROST DISCHARGE OUTDOOR HEAT EXCHANGER Including heat sink and RT64 T3 15AL250V T1AL250V T2AL250V 3 6X42 4x50 Q O O O O O O O QQ 1 9 QO QO OO QO Q 0 O O O O O O O O O RoHS h h h d d ah md amd d d md d a b md a a d d h b h h h h h h h h h h h h d h a h d d da h h d na d1 8x20 6x1000 39 UU MUZ GB50VA 12 2 ACCESSORY Symbol Q ty unit Part Name in Wiring Part No MUZ GB50VA Remarks Diagram E E12 817 704 DRAIN SOCKET 1 E12 444 705 DRAIN CAP 2 33 a MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Sep 2007 No OB455 REVISED EDITION D 6 Distributed in Jun 2007 No OB455 REVISED EDITION C 6 Distributed in Apr 2007 No OB455 REVISED EDITION B 6 Distributed in Aug 2006 No OB455 REVISED EDITION A 6 Distributed in Mar 2006 No OB455 6 New publication effective Sep 2007 Made in Japan Specifications subject to change without notice
34. an restart if discharge temperature thermistor reads 100 C or less 3 minutes later Check refrigerant circuit and refrigerant amount Refer to 10 6 Check of LEV 6 time flash High pressure Lighting Lighting Tthe outdoor heat exchanger temperature exceeds 70 C during cooling or the indoor gas pipe temperature exceeds 70 C during heating Check refrigerant circuit and refrigerant amount Check the stop valve 7 time flash Fin temperature The fin temperature exceeds 87 C during operation P C board temperature 4 times The P C board temperature exceeds 70 C during operation Check around outdoor unit Check outdoor unit air passage Refer to 10 6 Check of outdoor fan motor 8 time flash Outdoor fan motor Lighting Lighting Failure occurs continuously 3 times within 30 seconds after the fan gets started Refer to 10 6 Check of outdoor fan motor 9 time flash Nonvolatile memory data Lighting 5 times Nonvolatile memory data cannot be read properly Replace the outdoor electronic control P C board 10 time flash Discharge temperature Lighting Lighting The frequency of the compressor is kept 80Hz or more and the discharge temperature is kept under 39 C for more than 20 minutes Check refrigerant circuit and refrigerant amount Refer to 10 6 Check of LEV NOTE Blinking patterns
35. check inverter compressor within 3 minutes after start up Check the stop valve Lightni 3 ti Discharge temperature Ashort circuit is detected in the thermistor during operation or an open Refer to 10 6 Check of outdoor thirmistors ignining thermistor circuit is detected in the thermistor after 10 minutes of compressor start up Fin temperature thermistor Refer to 10 6 8 Check of outdoor thirmistors Lightning 4 times A short or open circuit is detected in the thermistor during operation P C board temperature Replace the outdoor electronic control P C board thermistor eplace the outdoor electronic control P C board Ambient Temperature A short or open circuit is detected in the thermistor during operation thermistor heat exe A short circuit is detected in the thermistor during operation or an open s d id d circuit is detected in the thermistor after 5 minutes in cooling and Lightning 5times 97810 f ermisto 10 minutes in heating of compressor start up Refer to 10 6 8 Check of outdoor thirmistors A short circuit is detected in the thermistor during operation or an open Defrost thermistor circuit is detected in the thermistor after 5 minutes of compressor start up Lightning 6times Serial signal he communication fails between the indoor and outdoor unit for 3 minutes ped 10 6 8 How to check miswiring and serial signal Lightning 7 times Nonvolatile memory data The nonvolatile memory data
36. cle 16 2 Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal Confirm if outdoor unit is abnormal according to the following procedures Confirm that the remote controller is in the failure mode recall function Y 1 Regardless of normal or abnormal condition 2 short With the remote controller headed towards the indoor unit press TOO COOL or TOO beeps are emitted as the signal is received WARM button to adjust the set temperature to 25C x1 Y Does left lamp of OPERATION INDICATOR lamp N on the indoor unit blink at the interval of 0 5 seconds OFF Blinks The outdoor unit is abnormal Beep is emitted at the same timing as the blinking of the left lamp of OPERATION INDICATOR lamp X2 Yes Blinks The outdoor unit is abnormal Check the blinking pattern and confirm the abnormal point with the Th td iti outdoor unit failure mode table Refer to 10 2 3 OU OO AMIE IS ORTI 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 1 Turn OFF the power supply and turn it ON again Release the failure mode recall function according Press RESET button of the remote controller to the left mentioned procedure Repair the defective parts
37. d Oil separator has been added Capillary tube has been added 1 8X40 6X1000 MUZ GB50VA E has been added Check of outdoor thermistors 10 6 has been corrected Revision C RoHS PARTS LIST has been changed Revision D RoHS PARTS LIST has been changed 1 TECHNICAL CHANGES MUZ GA50VA m gt MUZ GB50VA m 1 Refrigerant filling capacity has been changed 2 Outdoor electronic control P C board has been changed MUZ GB50VA m MUZ GB50VA 1 Compressor has been changed SNB130FLDH1 gt SNB130FLEH1 2 Outdoor electronic control P C board has been changed 2 PART NAMES AND FUNCTIONS MUZ GB50VA ACCESSORIES Airinlet back and side Piping MUZ GB50VA Drain socket Drain cap 33 IN Outdoor model MUZ GB50VA Function Cooling Heating Power supply Single phase 230V 50Hz Capacity Rated frequency Min Max 5 0 0 9 5 8 5 8 0 9 7 8 Dehumidification 2 5 Air flow 1 High Low 2 940 1 650 2 940 2 210 Power outlet Capacity Running current 1 7 23 7 43 Power input 1 1 610 1 660 Power factor 1 Starting current 1 Compressor motor current 1 Fan motor current 1 efficient of
38. d Lightin 12 times Zero cross detecting circuit Zero cross signal cannot be detected while the compressor is operating e Check the connecting wire among outdoor electronic control ging protection P C board noise filter P C board and power board Outdoor electronic control P C board Parts side LED LED1 TN VV Lighting gt e n d ON Indication y F Symptom Abnormal point Condition Condition Correspondence No symptom EED Red LED2 Yellou P p Outdoor unit Me Primary current protection he input current exceeds 15A These symptoms do not mean any abnormality of the 20 operates Once Lighting Sm memes SOR product but check the following points econdary current protection current of the compressor exceeds 15A Check if indoor filters are clogged tah High pressure protection he indoor gas pipe temperature exceeds 45 C during heating Check if refrigerant is short 21 Twee Lighting Check if indoor outdoor unit air circulation is short cycled Defrosting in cooling he indoor gas pipe temperature falls 3 C or below during cooling Discharge temperature Check refrigerant circuit and refrigerant amount 22 3 times Lighting rot r P The discharge temperature exceeds 100 C during operation Refer to 10 6 Check of LEV Refer to 10 6 Check of outdoor thermistors The frequency of the compressor is kept 80 2 or more and the discharge
39. ectronic No Replace the outdoor electronic control P C board repeat 3 6 second OFF gt control P C board 2 Outdoor electronic control P C board and 0 8 second ON quick blinking Lighted Parts side or not Yes lighted 2 Be careful to the residual LEDI voltage of smoothing capacitor e Q Turn OFF the power supply Remove the short circuit between Is there any error of the ec oli Ren S indoor outdoor connecting wire Yes Replace the Lighted Blinking IS her amplitude of 10 10 20V DC No such as the damage of the wire indoor outdoor between outdoor terminal block S2 intermediate connection poor connecting wire A and S3 Confirmation of serial contact to the terminal block Turn OFF inverter controlled lighting signal No equipment Yes Turn OFF the power supply and then turn ON again Press EMERGENCY OPERATION x Is there any error of the switch Is there rated voltage between indoor outdoor connecting wire Replace the Reinstall indoor terminal block S1 and S2 No such as the damage of the wire indoor outdoor either the lt Confirmation of power voltage gt intermediate connection poor connecting wire unit or the Yes contact to the terminal block rud light each No Is serial signal other away error indicated Attach a filter 6 minutes later on remote control receiving section of Be sure to release the failure mode Mun recall function after checking
40. el cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 8 Disconnect the following connectors Noise filter P C board CN912 R V coil 4 Remove the R V coil Photo 9 35 __ OPERATING PROCEDURE PHOTOS 4 Removing the defrost thermistor discharge temper Photo 5 ature thermistor outdoor heat exchanger tempera ture thermistor and ambient temperature thermistor 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Disconnect the following connectors Electronic control P C board CN661 Discharge temperature thermistor defrost thermistor and outdoor heat exchanger temperature thermistor CN663 Ambient temperature thermistor 4 Pull out the defrost thermistor from its holder Photo 6 5 Pull out the discharge temperature thermistor from its holder Photo 5 6 Pull out the outdoor heat exchanger temperature thermistor from its holder Photo 6 7 Pull out the ambient temperature thermistor from its holder Photo 6 Photo 6 Outdoor heat exchanger Ambient temperature thermistor temperature thermistor Discharge temperature thermistor 5 Removing outdoor fan motor Photo 7 1 Remove the top panel cabinet and service panel Screws of the outdoor fan motor Refer to 1 2 Remove the back panel Refer to 1 3 Disconnect the following connectors Electronic con
41. erant circuit and refrigerant amount 4 times Goes out Refer to 10 6 0 Check of outdoor fan motor P C board temperature The P C board t ds 70C duri protection e P C board temperature exceeds uring operation High pressure protection The outdoor heat exchanger temperature exceeds 70 C during cooling or Check the amount of gas and the refrigerant circuit indoor gas pipe temperature exceeds 70 C during heating Check stop valve 5 times Goes out 8 times Goes out Converter protection A failure is detected in the operation of the converter during operation Replace the power board Bus bar voltage protection 1 The bus bar voltage exceeds 400V or falls to 200V or below during 9 times Goes out compressor operating Replace the power board Bus bar voltage protection 2 The bus bar voltage exceeds 400V or falls to 50V or below during compressor operating Failure occurs continuously 3 times within 30 seconds after the fan gets 13 times Goes out Outdoor fan motor started y Refer to 10 6 Check of outdoor fan motor A shi ircuit i in th Lighting 8 times Current sensor protection ibn opent dreut T ARTES GGG durig compressor Replace the power board Light i Communication between P C Communication error occurs between the outdoor electronic control P C Check the connecting wire between outdoor electronic control gung boards protection board and power board for more than 10 seconds P C board and power boar
42. he input voltage to the outdoor electronic No control P C board 370V or more Replace the power board Yes Turn off power supply of indoor and outdoor unit and measure the compressor winding resistance between the compressor terminals Is the resistance between each terminal normal Yes Reconnect the lead wire of compressor and turn on power supply to indoor and outdoor unit 3 minutes later start EMERGENCY OPERATION Replace the compressor Clarify the causes by counting time until the inverter stops 0 to 10 seconds compressor rare short 10 to 60 seconds compressor lock 60 seconds to 5minutes refrigerant circuit defective 5 minutes or more normal 24 i When OPERATION INDICATOR lamp flashes 6 time When thermistor is abnormal Check of outdoor thermistors Disconnect the connector in the outdoor electronic control P C board or the outdoor power board No see below table and measure the resistance of thermistor Is the thermistor normal Replace the thermistor x X When RT64 is abnormal Yes replace the outdoor power board Reconnect the connector CN661 CN663 and CN3 3 minutes after turning on the power supply start EMERGENCY OPERATION Yes Replace the outdoor electronic control P C board Does the unit operate 10 minutes or more without Thermistor Connector Pin No showing thermistor abnormality Defrost Between CN661 pin1 and pin2
43. heck of inverter Flow chart of installation of miswiring thermistor indoor fan electronic inverter outdoor board or out the detailed the horizontal and serial and indoor motor control compressor thermistors door control outdoor unit vane signal error coil thermis P C board electronic failure mode tor control P C recall function Refer to Test point diagram and voltage 20 10 4 Troubleshooting check table MUZ GB50VA NOTE 1 The location of LED is illustrated at the right figure Refer to 10 7 1 2 LED is lighted during normal operation The flashing frequency shows the number of times the LED blinks after every 2 5 second OFF Example When the flashing frequency is 2 0 5 second ON 2 5 second OFF 21 Indication Symptom point ymp LEDi Red LED2 Yelow bnormal point Condition Condition Correspondence oes Overcurrent protection stop is continuously performed 3 times within Check the connection of the compressor connecting operate 1 minute after the compressor gets started or when converter protection wire Lightning Twice Outdoor power system stop or bus bar voltage protection stop is continuously performed 3 times Refer to 10 6 How to
44. heck room Refer to 10 6 Refer to 10 6 0 Refer to 1 Check indoor outdoor temperature How to check Check of Check of chock tthe pow Gf thermistor inverter RV coil remote controller 5 supplied to the Refer to compressor and receiver indoor unit Test point P C board 2 Refer to diagram and Check of indoor on voltage electronic control 7771 Refer to indoor unit P C board and indoor service manual fan motor E NUS MN All lamps Leftlamp lamp Left lamp Leftlamp Leftlamp Left lamp Left lamp Left lamp A ao Pt onand flash 3 flash 4 time flash 5 flash 6 timeflash 7 flash 14 flash intervals equ Cause Cause Cause Cause Cause Cause Cause intervals ls Troublet Indoor unit Indoor unit f Outdoor unit Outdoor unit Outdoor unit Outdoor unit Indoor unit Case room temp Trouble of Trouble of Outdoor Trouble of Trouble of Other e The horizontal i oo eraiure indoor fan indoor unit power thermistor outdoor abnormality sae a Outdoor unit indoor coil motor control system in outdoor control correctly e Miswiring or thermistor system abnormality unit system trouble of i serial signal Refer to Refer to 10 6 Check room Refer to Replace the Refer to 10 6 Refer to 10 6 Replace Check 10 2 2 Check of How to check temperature Check of indoor How to check C
45. leading to the compressor If the connector CN912 is 2 3 minutes after turning on the power supply start EMERGENCY not connected or R V coil OPERATION in COOL mode is open voltage occurs between terminals even when the control is OFF Is there voltage of 230V AC between pin1 and pin 2 at connector CN912 Replace the 4 way valve Yes 1 Turn off power supply of indoor and outdoor unit and disconnect the connector CN781 in the outdoor electronic control P C board 2 8 minutes after turning on the power supply start EMERGENCY OPERATION in COOL mode Is there voltage 12V DC between the connector CN781 pin 5 and pin 3 Replace the noise filter P C board Replace the outdoor electronic control P C board 26 U Fan motor does not operate or stops operating shortly after starting the operation Check of outdoor fan motor Check the connection between the connector CN931 and CN932 Is the resistance between each terminal V Yes of outdoor fan motor normal No Disconnect CN932 from outdoor electronic control P C board and turn on the power supply Rotate the outdoor fan motor manually and measure the voltage of CN931 Between and Between and G Between and Fixed to either 5V or OV DC No Does the voltage between each terminal become 5V DC and 0V DC repeatedly No Yes Does the outdoor
46. nal is received lamp on the indoor unit blink at the interval of 0 5 No Indoor unit is normal seconds OFF But the outdoor unit might be abnormal because there are some Blinks Either indoor or outdoor unit is abnormal gt abnormalities that can t be recalled with this way Beep is emitted at the same timing Confirm if outdoor unit is abnormal according to the detailed outdoor as the blinking of the left lamp of unit failure mode recall function Refer to 10 2 2 OPERATION INDICATOR lamp 2 Yes Judgment of indoor outdoor abnormality Blinks Before blinking does the left lamp of OPERATION INDICATOR lamp stay ON for 3 Yes seconds Stays ON for 3 seconds without beep The outdoor unit is abnormal The indoor unit is abnormal The outdoor unit is abnormal Check the blinking pattern and confirm the abnormal point with the indoor unit Check the blinking pattern and confirm the abnormal point with the failure mode table Refer to indoor unit service manual outdoor unit failure mode table Refer to 10 2 3 Make sure to check at least two consecutive blinking cycles 2 Make sure to check at least two consecutive blinking cycles 3 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 J Repair the defective
47. nect to the noise filter 33 11 DISASSEMBLY INSTRUCTIONS lt Terminal with locking mechanism Detaching points The terminal which has the locking mechanism can be detached as shown below There are two types Refer to 1 and 2 of the terminal with locking mechanism The terminal without locking mechanism can be detached by pulling it out Check the shape of the terminal before detaching 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector has the locking mechanism Sleeve Slide the sleeve Hold the sleeve and 1 the terminal while pull out the terminal Locking lever pushing the locking slowly lever Connector MUZ GB50VA OPERATING PROCEDURE PHOTOS 1 Removing the cabinet Photo 1 1 Remove the screws of the service panel Screw of the top panel 2 Remove the screws of the top panel 3 Remove the screw of the valve cover 4 Remove the service panel b Remove the top panel 6 Remove the valve cover 7 Disconnect the power supply and indoor outdoor connecting wire Screws Remove the screws of the cabinet of the 0 Remove the screws of the back panel Remove the back panel 9 Remove the cabinet cabinet 1 11 Photo 3 Screws of the cabinet Photo 2 Srey motor supper Screw of the service panel Screws of the Screws m of the SUP ed back i Screw
48. onents for bursting and discoloration 4 When troubleshooting refer to 10 2 10 3 and 10 4 15 10 2 Failure mode recall function Outline of the function This air conditioner can memorize the abnormal condition which has occurred once Even though LED indication listed on the troubleshooting check table 10 4 disappears the memorized failure details can be recalled This mode is very useful when the unit needs to be repaired for the abnormality which doesn t recur 1 Flow chart of failure mode recall function for the indoor outdoor unit Operational procedure The cause of abnormality cannot be found because the abnormality doesn t recur Setting up the failure mode recall function Turn ON the power supply lt Preparation of the remote controller gt D While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time press RESET button First release RESET button And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds MITSUBISHI ELECTRIC Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit 1 l 1 Regardless of normal or abnormal condition a short Does the left lamp of OPERATION INDICATOR beep is emitted once the sig
49. oor outdoor unit failure mode recall function OFF None Normal 2 time flash Outdoor power system Lighting Lighting Overcurrent protection stop is continuously performed 3 times within 1 minute after the compressor gets started or converter protection stop or bus bar voltage protection stop is continuously performed 3 times within 3 minutes after start up Check the connection of the compressor connecting wire Refer to 10 6 How to check inverter compressor Check the stop valve 3 time flash Discharge temperature thermistor Lighting Once Defrost thermistor Lighting Once Ambient temperature thermistor Lighting Twice Fin temperature thermistor Lighting 3 times P C board temperature thermistor Lighting 4 times Outdoor heat exchanger temperature thermistor Lighting 9 times Thermistor shorts or opens during compressor running Refer to 10 6 Check of outdoor thermistors Replace the outdoor electronic control P C board Refer to 10 6 Check of outdoor thermistors 4 time flash Overcurrent 28A current flows into intelligent power module Reconnect compressor connector Refer to 10 6 How to check inverter compressor Check the stop valve 5 time flash Discharge temperature Lighting Lighting Discharge temperature exceeds 116 C during operation Compressor c
50. oor terminal block S1 and Check the wiring S2 4 Yes Press EMERGENCY OPERATION switch once Does the left lamp of OPERATION INDICATOR lamp light up Confirmation of the power to the indoor gt No Yes Is there any miswiring poor contact or wire disconnection of the indoor outdoor connecting wire Y eae ge No Is serial signal error indicated 6 minutes later gt gt Correct them Yes No Y A Y Turn OFF the power supply Check once more if the indoor outdoor B connecting wire is not miswiring Short circuit outdoor terminal block S2 x1 Miswiring may damage indoor electronic control i i 1 i i i 1 i i i i i i i i i i i i i i i i i i i i i i i i i Y i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i i S3 P C board during the operation 1 Be sure to confirm the wiring is correct before the operation starts sure to check this within minutes after turning ON After 3 minutes LED blinks 6 times Even when Turn ON the power supply the outdoor electronic control P C board is normal LED blinks 6 times after 3 minutes Does the LED on the outdoor el
51. pillary tube 3 6X42 4X50 Refrigerant pipe 6 35 with heat insulator m 1 2 Unit mm MUZ GB50VA MUZ GB50VA m Capillary tube 1 8X40 6X1000 Refrigerant pipe 12 7 with heat insulator Stop valve with service port Flared connection trainer Defrost 100 thermistor RT61 thermistor Discharge RT65 temperature thermistor En RT62 Compressor heat exchanger temperature thermistor Flared connection Strainer LEV Strainer Receiver 100 100 R V coil J heating ON m Stop valve Capillary tube OFF Refrigerant pipe 46 35 3 6XP2 4X50 gt Refrigerant flow in cooling with heat insulator gt Refrigerant flow in heating __ REFRIGERANT PIPING LENGTH and MAX HEIGHT DIFFERENCE Refrigerant piping m Piping size O D mm Model Max length Max Height difference A B Gas Liquid MUZ GB50VA 30 15 12 7 6 35 Indoor unit Max Height difference Max length A Outdoor unit ADDITIONAL REFRIGERANT CHARGE R410A g Refrigerant piping length one way Model precharged 15m 20 25 MUZ GB50VA 1 500 Calculation Xg 20g m X Refrigerant piping length m 7 NOTE Refrigerant piping exceeding 7m requires additional refrigerant charge according to the calculation 8 PERFORMANCE CURVES MUZ GB50VA
52. s anel of the um cabinet Screw of the valve cover Set screws of the back panel 34 OPERATING PROCEDURE PHOTOS 2 Removing the inverter assembly inverter P C board Photo 4 and power board 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Disconnect the following connectors lt Electronic control P C board gt CN931 and CN932 Fan motor CN795 LEV CN661 Discharge temperature thermistor defrost thermistor and outdoor heat exchanger temperature thermistor CN663 Ambient temperature thermistor L lt Noise filter P C board gt CN912 R V coil Remove the compressor connector Remove the screws fixing the relay panel Remove the inverter assembly Disconnect all connectors and lead wires on the electronic control P C board 8 Remove the electronic control P C board from the inverter assembly 9 Remove the screws fixing the power board assembly 10 Disconnect all connectors and lead wires on the power board 11 Remove the power board from the inverter assembly 12 Disconnect all connectors and lead wires on the noise filter P C board 13 Remove the noise filter P C board from the inverter assembly Screws of the power board assembly 4 S 6 7 Screws of the relay panel 3 Removing R V coil 1 Remove the top pan
53. t pipe flared 6 35 O g x T 8 z Gas refrigerant pipe joint Refrigerant pipe 198 flared 12 7 WOO 512 15 1 1 1 5 YOLSINYSAHL 15 3A1VA NOISNVaX3 AZT HOLOV3H 5 YOLSISSY FINGOW H3MOd LNASITMIALNI WIRING DIAGRAM v9x 390718 IWNIWYSAL cal 39018 WNINYAL bal YAWYOSSNVYL 1081 YOLSISSY YOLSISSY YATIOULNOO YOLOVA H3MOd YOLSIYVA Yall 3SION YOLOW uosSaudWoo 10120uu02 CLD jeuruue ejeoipul sioquiAS Bumm 404 AJUO sJojonpuoo 1eddoo es yz Burorwes 104 Bum 2 100pul BU 184914 Bum 317994 epis 1 eui S3 LON AV I3H 1109 GIONG IOS L9HSS YOLSINYAHL SYNLVEAdNAL 8914 YAONVHOXA LVAH HOOGLNO YOLSINYSHL SYNLVYAdWSL INalgv 91 YOLSINYSHL 3Hn 1VH3dW3l NIJ v91H A0S2 1vSL L ISNA A0S2 1V2L 3snd H3 NHOJSNVH L LN3HHDD
54. 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 indoor outdoor wiring grounding wire antennas wiring from antennas receiver 5 Electric field intensity of the broadcast station affected by the electromagnetic noise 6 Presence or absence of amplifier such as booster 7 Operation condition of air conditioner when the electromagnetic noise enters in 1 Turn OFF the power supply once and then turn ON the power supply In this situation check for the electromagnetic noise 2 Within 3 minutes after turning ON the power supply press OPERATE STOP ON OFF button on the remote controller for power ON and check for the electromagnetic noise 3 After a short time 3 minutes later after turning ON the outdoor unit starts running During operation check for the electromagnetic noise 4 Press OPERATE STOP ON OFF button on the remote controller for power OFF when the outdoor unit stops but the indoor outdoor communication still runs on In this situation check for the electromagnetic noise 30 10 7 Test point diagram and voltage 1 Outdoor electronic control P C board MUZ GB50VA Discharge temperature thermistor RT62 E
55. thermometers to prevent direct rays of the sun Check that the air filter is cleaned Open windows and doors of room Press the EMERGENCY OPERATION switch once twice to start the EMERGENCY COOL HEAT MODE When system stabilizes after more than 15 minutes measure temperature and take an average temperature 10 minutes later measure temperature again and check that the temperature does not change INDOOR UNIT OUTDOOR UNIT m Wet and dry bulb Wet and dry bulb thermometers thermometers FRONT VIEW BACK VIEW 8 1 Capacity and input curves Cooling capacity Total input cooling 2 5 874 14 1 4 i E 8 0 4 S13 1 3 GO as 73 1 2 26 12 3 8 g 26 24 22 5 66 91 1 24 1 1 20 2 door 3 5 10 tre C 20 teme 9 4 tem 7 09 lt r oe air Wer Peratur c 7418 indoor intak gt 27 30 35 40 43 27 30 35 40 43 E X 5 Outdoor intake air Dry bulb temperature Outdoor intake air Dry bulb temperature oo 10 10 t fc O98 NN amp 2 5 Heating capacit i i 244 is g capacity 2 Total input heating 22 3 1 2 A
56. trol P C board CN931 and CN932 Fan motor 4 Remove the propeller b Remove the screws fixing the fan motor 6 Remove the fan motor Propeller 36 C OPERATING PROCEDURE PHOTOS 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Remove the inverter assembly Refer to 2 4 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm 0 MPa 5 Detach the welded part of the suction and the discharge pipe connected with compressor Photo 9 6 Remove the compressor nuts 7 Remove the compressor 8 Detach the welded part of 4 way valve and pipe Photo 8 Welded parts of 4 way valve Photo 9 R V coil Welded part of the dis charge pipe Welded part of the suction pipe 7 Removing the reactor Photo 10 1 Remove the top panel Refer to 1 2 Disconnect the reactor lead wire 3 Remove the screws of the reactor and remove the reactor Screws of the reactor 37 RoHS PARTS LIST RoHS compliant 12 12 1 OUTDOOR UNIT STRUCTURAL PARTS ELECTRICAL PARTS AND FUNCTIONAL PARTS MUZ GB50VA 25 24 17 3J 7 12 10 38 MUZ GB50
57. xed frequency operation Press EMERGENCY OPERATION switch to COOL or HEAT mode COOL Press once HEAT Press twice Test run operation starts and continues to operate for 30 minutes Compressor operates at rated frequency in COOL mode or 58Hz in HEAT mode Indoor fan operates at High speed After 30 minutes test run operation finishes and EMERGENCY OPERATION starts Operation frequency of compressor varies To cancel test run operation EMERGENCY OPERATION press EMERGENCY OPERATION switch or any button on remote controller akRWN o 10 8 4 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT NOTE The unit of pressure has been changed to MPa based on the international system of units SI unit system The conversion factor is 1 MPa Gauge 10 2 Kgf cm Gauge COOL operation Both indoor and outdoor unit are under the same temperature humidity condition Operation TEST RUN OPERATION refer to 8 3 MUZ GB50VA kgf cm Gauge MPa Gauge o 5 9 lt 1 di 2 e 5 8 6 87 5 s o 51 0 5 4 1 30 32 35 C 15 1820 25 30 32 35 C 50 60 70 96 50 60 70 Ambient temperature C Ambient temperature C Ambient humidity Ambient humidity HEAT operation Condition Dry bulb Relative humidity 25 60 30 70 Indoor Outdoor Dry bulb temperature C 20 0 7 1

Mitsubishi MUZ-GB50VA Service manual

Contents

Download Pdf Manuals

Related Search

Related Contents