Mitsubishi Electronics MXZ-24UV User's Manual
Contents
1. lt COOL gt Capacity COOL Total input lt HEAT gt Capacity lt HEAT gt Total inpu 15 0 15 15 1 0 1 0 dn 1 0 0 5 0 5 05 0 5 0 50 100 150 Hz 0 50 100 150 Hz 0 50 100 150 Hz 0 50 100 150 Hz Frequency Frequency Frequency Frequency 2 09 class unit in single operation lt COOL gt Capacity COOL Total input HEAT Capac2. 2 Use copper conductors only For field wiring 3 Symboles below indicate Terminal block Connector 10 BRN GRY 283 28 BLK 7 9 ae XM B NER NE BLK Ka WHT VL 80916 R NOISE FILTER POWER SUPPLY P C BOARD N 230V 63H2 50Hz i ORN 5 ORN JO Z E 1 RELAY CIRCUIT BRAKER Sl 5 LDE 1 PO BOARD INDOOR 7 ENG ETI E S 9 8 L T T FE su op e ES UNITA TE SH Les gs tim M 29 INDOOR L p oN zl 7 4 L e I UNIT B s ZS am 2 95 INDOOR _ S es 22 UNIT 0 MEN E E _ _ E E deu 851 CNS52 ELECTRONIC CONTROL P C BOARD CN791 CN722 CN663 CN662 I2 TS 456 1 2 3 4 112 1 2 3 4I5 6 7 8 HAE LI a EE ef sa SE RASE gg x EEG S IS Seele em GIO GIG Go o 3H1 RT65 RT66 T RT68 RT62 RT63 LEVA LEVB LEVC RT67 RT61 SYMBOL NAME SYMBOL NAME SYMBOL NAME C61 POWER FACTOR CAPACITOR LEV A C EXPANSION VALVE SSR61 SOLENOID COIL RELAY C62 63 SMOOTHING CAPACITOR MC COMPRESSOR T801 TRANSFORMER C65 OUTDOOR FAN CAPACITOR MF61 FAN M
3. 0 3 0 6V DC 2 5 4 0V DC Evaporation temperature thermistor Discharge temperature thermistor SG 2 5 4 0V DC 0 10 20 30 40 50 60 70 80 90 100 110 120 Temperature pp Defrost temperature thermistor _ gt Gas pipe temperature thermistor Evaporation temperature thermistor Defrost temperature thermistor Resistance kQ Outdoor fan ON 12V DC TYy Outdoor fan Lo 12V DC 0 20 10 0 10 20 30 40 Temperature C Resistance kQ Serial signal Room B 5 10V DC Serial signal Room A 5 10V DC Relay 12V DC Outdoor fan 12V DC Fin temperature thermistor T 12V DC 1 0 4 0V DC Serial signal Room C 5 10V DC do 9 p Pose lati Sanz ER 180 w l V S s MAS HG Hn MADRE cw B 100 EDS 80 P ie GD P 60 r1 EA D SE mm RICE RIM 20 3 3 veh B 3 HR S 0 10 20 30 40 50 60 70 80 ie gt 3h vel a sty uiis Temperature C 3 9 ef e EG a JEG i fr Bind evnet pup Gig 32 mul tem 2 er o 0 5V DC S e ee 2 SE00A676 SC Li 5 B Bg z Z x3 3 S Wl SC 5V DC rusen
4. OPERATING PROCEDURE PHOTOS 5 Removing the reactor 1 Remove the five screws of the top panel and remove it See Photo 6 Photo 1 2 Disconnect the reactor lead wire Reactor 3 Remove the two screws of the reactor and take it out 38 14 PARTS LIST 14 1 OUTDOOR UNIT FUNCTIONAL PARTS MXZ 24UV MXZ 24UV m 1 2 Part numbers that are circled are not shown in the illustration 2 Symbol Q ty unit No Parts No Parts Name in Wiring Remarks MXZ 24UV E1 MXZ 24UV E2 Diagram 1 T2W E40 301 OUTDOOR FAN MOTOR MF61 1 1 RA6V60 2 M21 17A 501 PROPELLER FAN 1 1 3 M21 17E 337 REACTOR L 1 1 4 T2W E89 451 ELECTRONIC CONTROL P C BOARD 1 1 5 T2W E79 424 NOISE FILTER P C BOARD 1 T2W G01 424 NOISE FILTER P C BOARD 1 6 T2W E58 376 TERMINAL BLOCK TB2 3 4 3 3 7 T2W E70 308 FIN TEMPERATURE THERMISTOR RT65 1 1 8 M21 42A 340 RELAY X64 1 1 9 M21 42A 308 THERMISTOR SET RT61 62 63 1 1 DISCHARGE DEFROST 10 T2W E65 375 TERMINAL BLOCK TB1 1 1 11 T2W E70 398 R V COIL 2154 1 1 12 T2W E88 307 GAS PIPE TEMPERATUR THERMISTOR RT66 67 68 1 1 13 21 17 362 RESISTOR R 1 100 T2W G01 362 RESISTOR R 1 200 14 T2W E40 357 POWER FACTOR CAPACITOR C61 1 1 2204F 400V 15 T2W E40 356 SMOO
5. v Disconnect the fan motor connector and measure the resistance of the Abnormal hage Me Replace the fan motor fan motor winding to check the winding characteristic Normal v 1 Disconnect the lead wire leading to the compressor Turn on power supply to the indoor and outdoor unit Three minutes later EMERGENCY OPERATION starts 2 Check the voltage between pin 2 and pin 3 pin 2 and pin 5 pin 2 and pin 6 at the fan motor connector lt Is there voltage of 230V Ss V No 1 Turn off power supply of the indoor and outdoor unit and disconnect the connector CN851 CN852 2 Is the voltage OV when the voltage between CN852 pin1 and CN851 pint pin2 or pin3 are measured after the power supply is turned on the outdoor unit Replace the electronic control P C board Is there voltage of 12V DC between CN852 pint and pin3 when power supply turns on the indoor unit and EMERGENCY OPERATION starts in three minutes Yes Replace the noise filter P C board 31 When the operation frequency does not go up from lowest frequency Check of HPS 1 Disconnect the connector CN722 in the electronic control P C board 2 Check the resistance of HPS after 1 minutes have passed since the outdoor unit power supply was turnd off l Check the resistance between Infinity each terminal Jm Replace HPS 63H1 Return CN72
6. we 55 Si e Eege 4 pen BO 4 4 4 EG 1091 7 F 242 5 4 JO tk XO 1259 EI pi 090 120 4 D co Ki reen Fam Re02 Zei Er laO z gt on 0802 Bee afa a gr Oreos le c5p2 TR 620 g EN E 5 ROL 4 H 12V DC Hao H2DA817604 Fidi pressure 0551 0552 0553 switch 0 ech Wooo DE76N172603 DE00N173 B lo Ka Ee d p Short 35 Ek 0C 9 79871 ESCH SSEYL 320V DC 13 DISASSEMBLY INSTRUCTIONS EN MXZ 24UV E1 MXZ 24UV Je OUTDOOR UNIT OPERATING PROCEDURE 1 Removing the compressor 1 Remove the screws of the service panel and remove it Recover refrigerant gas Remove the screws of the top panel and remove it Remove the screws of the front panel and remove it Disconnect the compressor lead wire TAB64 TAB65 TAB66 Disconnect the outdoor electronic control P C board connectors CN791 CN792 CN793 CN794 CN662 CN722 and CN661 Disconnect the noise filter P C board connectors CN913 6 Remove the four screws of the electrical parts and remove them 7 Remove the propeller 8 Remove the screws of
7. BLU 430 520 or short circuited High pressure switch HPS Measure the resistance using a tester Part temperature 10 C 40 C Pressure Normal abnormal Operation OFF HPS1 2 35 0 15MPa 24 1 5kg cm Short Other than HPS2 2 55 0 2MPa 26 2kg cm those list HPS1 2 75 9 95 MPa 28 9 8 kg cm ed at left HPS2 3 4348 15 MPa 35 9 skg cm Inner protector 27 Outdoor unit does not operate LED display display OFF Check of power supply Check the connecting of main circuit parts and connector CN501 I P M C board CN 801 Electronic control P C board CN554 relay P C board Turn on power supply Is there voltage of 230V AC in the No power supply terminal block p Check the power supply cable Yes Is there voltage of 230V AC across Is there voltage of 310V DC 340V DC No the output cable LD63 LD64 in the No Replace the noise across the smoothing capacity GERS filter P C board noise filter P C board V Yes Yes Replace the electronic control P C board Is there voltage of 230V AC across e No Replace the current the input terminal part in the diode EE E module DS61 9 When replacing check the Ves connection of connector CN720 in the outdoor Check the main circuit parts electronic control P C a
8. AY Detecting method Outdoor power system abnor Outdoor unit does not operate Detecting method When the compressor operation has been interrupted by overcurrent protection continuously three times within 1 minute after start up the Check points Inverter output A4 mality compressor stops operation Compressor 23 Outdoor electronic control P C When the nonvolatile memory data cannot be read properly on the out Outdoor electronic control P C board A3 board abnormality door controller board When the drain abnormality is detected in the indoor unit and the indoor Check the abnormality indication on the He init epa LEV Abner main coil temperature is too low or when any abnormality is detected in indoor unit P1 y the components of indoor unit LEV Outdoor unit stops and restarts every 3 minutes Symptom Display Detecting method Evaporation temperature ther mistor abnormality Discharge temperature ther mistor abnormality Detecting method The compressor stops when a short or open circuit occurs in the evap oration temperature thermistor during compressor running The compressor stops when a short or open circuit occurs in the dis charge temperature thermistor during compressor running Check points Check the characteristic of the evapora tion temperature thermistor Refer to O on page 31 Check the contact of P C board con nectors Check th
9. ROTARY Output 2000 Winding resistance at20 C Compressor U V 0 61 V W 0 61 W U 0 61 Model RA6V60 BA Fan motor Winding resistance at20 C WHT BLK 78 7 BLK YLW 26 9 YLW BLU 11 7 BLU RED 83 6 Dimensions WxHxD 900x900x320 35 Weight 78 Sound level High 46 47 Fan speed High Fan speed regulator 3 Refrigerant filling capacity R22 3 9 Refrigerating oil Model 870 MS 56 Thermistor RT61 13 4 at 100C Thermistor RT62 10 0 at 25 C Thermistor RT63 Thermistor RT65 Thermistor RT66 67 10 0 at 25 C 17 0 at 50 C 10 0 at 25 C Thermistor RT68 10 0 at 25 C NOTE Test conditions are based on ISO5151 Refrigerant piping length one way 5m 1 Electrical data is for only outdoor unit 2 However please refer to INDOOR OUTDOOR CORRESPONDENCE TABLE of page for the combination DB27 0 C WB19 0 C TEST CONDITIONS COOLING INDOOR OUTDOOR DB35 0 C WB24 0 C HEATING INDOOR DB20 0 C OUTDOOR DB 7 0 C WB 6 0 C NOISE CRITERIA CURVES 0 0002 MICRO BAR OCTAVE BAND SOUND PRESSURE LEVEL 0dB Test conditions MXZ 24UV E1 Cooling DB35C WB24C MXZ 24UV E2 Heating DB 7C WB6C 90 80 70 60 50 40 30 20 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE 10 63 125 250 500 1000 2000
10. Trouble criterion of main parts Part name Defrost thermistor Evaporation Gas pipe temperature thermistor Discharge temperature thermistor Check method and criterion Measure the resistance using a tester Part temperature 10 C 40 C Normal abnormal 55kQ Opened or short circuited Measure the resistance using a tester after warming up the thermistor by holding by hand Part temperature 20 C 40 Normal abnormal 100kQ 250kQ Opened or short circuited Compressor N RED V U WHT BLK Measure the resistance between terminals using a tester Winding temperature 10 C 40 Normal abnormal 1Each phase 0 530 0 660 Opened or short circuited Outdoor fan motor Protector specification Short 95215C Open 135 5C R V coil Measure the resistance between lead wires using a tester Part temperature 10 C 40 Normal abnormal WHT BLK 69 00 86 00 Opened or BLK YLW 23 00 30 00 short circuited YLW BLU 10 00 13 00 Not including RED BLK 73 00 91 00 WHT ORN Measure the resistance using a tester Part temperature 10 C 40 C Normal abnormal 1640Q 23100 Opened or short circuited Linear expansion valve YLW BRN BLU Measure the resistance using a tester Part temperature 10 40 C Lead wire color Normal Abnormal WHT RED RED ORN YLW BRN BRN
11. 20 23 e ID 0 0 o HUNN LC FETE RT ROTA RENE 2 RH de ee HERE 200 IW H s H C ECH N723 LED monitor indication Gas pipe temperature thermistor 2 5 4 0V DC 33 High pressure switch Liner expansion valve LEV 12V DC pulse wave Noise filter P C board MXZ 24UV E1 OUTDOOR FAN 230V AC REVERSING VALVE 230V F F61 250v 30A sare For cunt inued protection against the 311 WARNING i o fire replace only sith 20 ve same type and rati ng of fuse al ST e x MXZ 24UV 2 OUTDOOR FAN 230V AC WwW ES o DN is Ki ej C Hei REVERSING VALVE 230V F6 250V 30A 34 For cont d protection against WARNING Tine risk of fre replace with amp 5 y with BJS the same type and rating of fuse TT AS 230V AC OUTPUT 230V AC INPUT 230V AC OUTPUT Q Ze PSR pe DEOOM 53 BENA LES Replace them at the same time 230V AC INPUT P C board MXZ 24UV Je MXZ 24UV 2 Relay P C board MXZ 24UV MXZ 24UV E1 E2 12V DC 12V DC
12. PANEL 14 M21 48A 961 4 WAY VALVE 15 T2W E79 646 HIGH PRESSURE SWICH 63H1 16 M21 17A 297 TOP PANEL 17 T2W E40 523 REAR GUARD 18 M21 42E 630 HEAT EXCHANGER 19 M21 17A 249 SIDE PANEL 20 T2W E40 646 HIGH PRESSURE SWICH 63H2 en M21 986 936 CAPILLARY TUBE 2 M21 LVO 936 CAPILLARY TUBE SET e3 1 2 3 8 1 4 SET 2 75MPa 28kg cm 3 43MPa 35kg cm 4 0x42 4x400 3 0 42 0x200 4PCS SET T2W E59 936 CAPILLARY TUBE 2 5 0 6 1000 T2W 70 936 CAPILLARY TUBE 2 5x 0 6x750 When servicing cut the tube to the proper length as shown in the REFRIGERANT SYSTEM DIAGRAM See page 11 1 ech Q C 1 sch sch sch 1 ech 1 sch sch 1 sch f sch 1 sch 1 sch 1 sch 1 sch 1 sch ech 1 ech 1 sch sch 1 ech 1 D AA 40 14 3 ACCESSORY PARTS MXZ 24UV E MXZ 24UV E 1 Symbol Q ty unit No Parts No Parts Name in Wiring MXZ 24UV E1 Remarks Diagram MXZ 24UV E2 1 T2W E59 704 DRAIN SOCKET ASSEMBLY 1 SEM 41 15 OPTIONAL PARTS 15 1 Different diameter pipe Connected pipes MXZ 24UV Model name diameter mm S 9 52 12 7 MAC 454JP 3 8 1 2 For different _ 12 7 9 52 diameter MAC 455JP 1 2 3 8 pipes 2 12 7 15 88 MAC 456JP 1 9 5 8 15 2 Outlet guide Cha
13. connector CN913 control P C board yes 2 Turn on power supply to the indoor and outdoor unit three F minutes later EMERGENCY OPERATION Turn off power supply of indoor and outdoor unit HEAT operation starts i Is there voltage 12V DC between No Disconnect the connector CN913 in noise filter P C board and measure the resistance of R V coil to check the integrity Replace the electronic No Replace the R V coil the connector CN852 pin 1 CORTO board and pin 5 Yes y Yes Replace the noise filter P C board Replace the 4 way valve e When cooling operation does not work 1 Disconnect the lead wire leading to the compressor 2 Turn on power supply to the indoor and outdoor unit three minutes later EMERGENCY OPERATION COOL operation starts Is there voltage of 230V AC between pin1 and No pin 2 at connector CN913 PEPE yes 1 Turn off power supply of indoor and outdoor unit and disconnect the connector CN851 CN852 in the electronic control P C board 2 Turn on power supply to the indoor and outdoor unit three minutes later EMERGENCY OPERATION COOL operation starts Is there voltage 12V DC between the connector CN852 pin 1 and CN851 pin 5 1 N 856 Replace the noise filter board 1 If the connector CN913 is not connected or R V coil is open voltage 1 Yes occurs between terminals even when
14. the separator and remove it 9 Recover gas from the refrigerant circuit 10 Detach the brazed joints of the compressor suction and dis charge pipes See Photo 3 11 Remove the three compressor nuts and remove the compres sor 2 3 4 5 DI I IO wa p PHOTOS Photo 1 lt op panel Service panel Front panel a Photo 2 Wd bil Discharge pipe brazed part uction pipe e braxed part 36 OPERATING PROCEDURE PHOTOS 2 Removing the fan motor 1 Remove the top panel five screws the service panel four screws and the front panel two screws See Photo 1 2 Disconnect the connector CN911 on the outdoor controller board 3 Remove the propeller 4 Remove the fan motor 3 Removing the 4 way valve 1 Remove the screws of the top panel and remove it See Photo 1 2 Remove the service panel rear panel and connect cover panel Recover refrigerant gas 3 Remove the electrical parts See Photo 2 4 Detach the brazed joint of 4 way valve and pipe See Photo 4 4 way valve v V coil Brazing area 4 Removing the linear expansion valve 1 Remove the service panel See Photo 1 Gas release is not required if the unit is pumped down 2 Remove the coil of linear expansion valve 3 Detach the brazed joint of linear expansion valve and pipe Linear expansion valves 37
15. thermistor temperature RT66 67 68 thermistor RT63 Indoor Unit ck BE 1 Indoor Unit 7777 ee BT Indoor Unit gt zz 5 2 c LEV3 Outdoor fan motor MF61 Defrost thermistor RT62 11 1 LEV control Linear expansion valve LEV is controlled by Thermostat ON commands given from each unit Indoor unit status Stop of all indoor unit before stop pulse in 15 minutes When outdoor unit is operating COOL 5 pulse full closed Sr HEAT 59 pulse slightly opened Thermostat OFF When the outdoor unit operation When the other indoor unit operate 5 pulse When outdoor unit stops When the other indoor unit stops or thermo off COOL or DRY mode ee Maintain LEV opening before stop 500 pulse in 15 minutes LEV opening for each indoor unit is determined by adding adjustment in accordance with the number of operating unit and the capacity class to standard opening based on the operation frequency Ex Opening 130 pulse in standard opening 1 Minimum 80 pulse Maximum 205 Thermostat ON in pulse Capacity code 4 at 1 unit operation Capacity code 1 at 4 unit operation COOL or DRY mode After starting operation adjustment in accordance with intake super heat discharge temperature is included in standard opening 1 Note LEV opening in each frequency at DRY operation and COOL operation is the same However velocity and compressor operatio
16. 13 41516 7 8 8 l lmlo gt 20 52 GIG Glo Slo ala Glo D 19 63H1 RT65 RT66 2 RT68 RT62 RT63 LEV A LEVB LEVC RT67 RT61 SYMBOL NAME SYMBOL NAME SYMBOL NAME C61 POWER FACTOR CAPACITOR MC COMPRESSOR TB1 2 3 4 5 TERMINAL BLOCK C62 63 SMOOTHING CAPACITOR MF61 FAN MOTOR INNER PROTECTOR X61 62 68 FAN MOTOR RELAY C65 OUTDOOR FAN CAPACITOR H RESISTOR X64 65 RELAY CT61 62 CURRENT TRANSFORMER RT61 DISCHARGE TEMPERATURE THERMISTOR X66 67 RELAY DS61 DIODE MODULE RT62 DEFROST TEMPERATURE THERMISTOR 2184 R V COIL DS62 DIODE STACK RT63 EVAPORATION TEMPERATURE THERMISTOR 63H1 HIGH PRESSURE SWITCH F801 FUSE 1A RT65 FIN TEMPERATURE THERMISTOR 63H2 HIGH PRESSURE SWITCH Fou FUSE 1A RT66 67__ GUS PIPE TEMPERATURE THERMISTOR F912 FUSE 3 15A L REACTOR RT68 GUS PIPE TEMPERATURE THERMISTOR NR63 VARISTOR L61 COMMON MODE CHOKE COIL SSR61 SOLENOID COIL RELAY LEV A G EXPANSION VALVE T801 TRANSFORMER NOTE 1 About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing SG79Y088H01 9 REFRIGERANT SYSTEM DIAGRAM MXZ 24UV 1 Unit mm MXZ 24UV e Compressor High pressure switch 1 Discharge Refrigerant flow in cooling High pressure temperature Refrigerant flow in heating switch 2 thermistor i Capillary tube Accumulator Reversing valve coil J heating ON separator 2 5 0
17. 2 to former Turn on power supply to the indoor and outdoor unit 3 minutes lator EMERGENCY OPERATION starts V Yes Is HPS protection displayed immediately after compressor No 4 Replace the electronic control P C board starts Yes O The other cases In the case that the indoor fan and outdoor fan operate but the compressor does not operate it causes that the high pressure switch can be operated once First of all check the high pressure switch can be shorted turn OFF the power and turn ON again 1 minute later Indoor unit dose not operate difference modes When you try to run two indoor unit simultaneously one for cooling and the other for heating the unit which transmits signal to the outdoor units earlier decides the operation mode The other unit indicates as shown in the figure below When the above situation occurs set all the indoor units to the same mode turn OFF the indoor units and then turn them back ON Though the top of the indoor unit sometimes gets warm this does not mean malfunction The reason is that the refrigerant gas continuously flows into the indoor unit even while it is not operating OPERATION INDICATOR vl vl vl vl B H Lighting Sek Flashing uH 32 TEST POINT DIAGRAM AND VOLTAGE MXZ 24UV Je Electronic control P C board EN MXZ 24UV E2 Discharge temperature thermistor
18. 4000 8000 BAND CENTER FREQUENCIES Hz 7 OUTLINES AND DIMENSIONS OUTDOOR UNIT MXZ 24UV E MXZ 24UV E2 Handle for Air in Rubber cushion Unit 2 U shape notched holes moving 1 Installation space Air in 200 500 200 ase bo JL Air in N 2 2D gt a lg Air in HL ME IE Tv H alo Air out SE 2 12 X 36 Oval hole ase bolt M10 9 52 flared 3 8 C unit 35 900 12 7 flared 1 2 A B unit B Indoor and H outdoor H H connect wiring 23x45 hole H of H E E SE aj E C unit connection H Ex ge H B unit connection H Vie E unit connection gz SQ Note Leave front and both sides More than clearance fully 2 NEN pw e ai AA DS 88 8 Note Leave front overhead y A x clearance fully EF More than M More than 100 350 Note Leave front overhead and both clearance fully S ddd Liquid pipe 6 35 flared 1 4 Note Obsacle on front and rear sid only The unit can be used by attaching an optional outdoor outlet guide MAC 8
19. 55SG but both sides and the top are opend 2 Service space 00 uey SJON More than 100 More than uey SJON More than 350 350 Service space 8 WIRING DIAGRAM OUTDOOR UNIT MODELS MXZ 24UV 1
20. 6X1000 cooling OFF Ball valve with Unit gas pipe temperature thermistor service port Indoor unit 9 52 LAA Reversing valve C Unit B gas pipe temperature thermistor 12 KE O x Muffl Indoor unit yL E 218 B Unit gas pipe temperature thermistor 12 Indoor unit gt Evaporation A temperature thermistor RT67 Capillary tube 3 0X42 0Xx 200 BERGE Outdoor heat exchanger Ind it i E E lt CD Gi Ball valve with Capillary tube Strainer Capillary tube LEV 6 service port 2 5X 0 6X 750 3 0 2 0 200 e E Ind t il Marra Strainer Capillary tube LEV thermistor 3 0X2 0X 200 M a Indoor ne Strainer d Distributor Distributor 49 52 CD Strainer Indoor units 1 1 Outdoor H Piping length each indoor unit a b c 25m Total piping length a b c 50m S Height difference between units 10m Bending point for each unit 25 Total bending point 50 H lt does not matter which unit is higher Refrigerant pipe diameter is different according to indoor unit be connected When using extension pipes refer to the tables below When diameter of refrigerant pipe is different from that of outdoor unit union use optional Different diameter pipe For further information on Different diameter pipe see page BACK COVER Unit mm inch Indoor unit Outdoor unit union diam
21. 75180 12 08 9 0 2500 07407418 Si 52075180 12 08 07 09 09 Si 52073180 12 08 9 0 2500 0740918 f 90 52075180 12 08 9 0 2500 NOTE SLH 1AR is equivalent to class 09 9000BTU MCFH 13NV SEH 1 6AR SLH 1 6AR is equivalent to class 12 12000BTU MCFH 18NV SEH 2AR SLH 2AR is equivalent to class 18 18000BTU SPECIFICATION Outdoor model MXZ 24UV Tel MXZ 24UV Outdoor unit power supply Single phase 230V 50Hz Indoor units number 2103 Indoor units total capacity Connectable 2 Total model name 34 3 indoor units 36 2 indoor units Indoor units total capacity Simultaneous operation 2 Total model name 34 3 indoor units 36 2 indoor units Piping total length Max 50 Connecting pipe length Max 25 Height difference Indoor Outdoor 10 Height difference Indoor Indoor 10 Function Cooling Heating Capacity 7 1 0 9 8 5 9 0 0 9 10 9 Dehumidification Capacity Outdoor air flow Power outlet Running current 10 05 12 08 Power input 2080 260 4070 2500 270 3180 Auxiliary heater Crankcase heater Electrical Power factor Starting current Compressor motor current 8 7 9 1 Fan motor current Coefficient of performance C O P 2 68 3 35 Model THV247FBA
22. Changes for the Better MITSUBISHI ELECTRIC SPLIT TYPE HEAT PUMP AIR CONDITIONER Revision e MXZ 24UV E2 has been added Please void OB287 No 0B287 REVISED EDITION A SERVIGE MANUAL Inverter controlled multi system Model MXZ 24UV MXZ 24UV CONTENTS 1 TECHNICAL CHANGES 2 2 PART NAMES AND EUNGCTIONS 3 3 INDOOR OUTDOOR Beet CORRESPONDENCE TABLE 4 4 INDOOR UNITS COMBINATION 5 SPECIFICATION 7 E 6 NOISE CRITERIA CURVES 8 7 OUTLINES AND 9 J ememr 8 WIRING DIAGRAM nnn 10 a 9 REFRIGERANT SYSTEM DIAGRAM 11 d 10 PERFORMANCE CURVES s 12 11 MICROPROCESSOR 18 12 TROUBLESHOOTING 24 13 DISASSEMBLY INSTRUCTIONS 36 IST RR 39 15 OPTIONAL PARTS critt ror d ata 42 This manual describes technical data of the outdoor unit For the indoor unit refer to the service manuals No OB229 OB227 REVISED EDITION B OB252 OB212 OB239 and OC165 of corresponding models 1 TECHNICAL CHANGES MXZ 24UV e gt MXZ 24UV e 15 2 Combinations of the connectable indoor units have increased Noise filter P C board has changed to improve the capacity for protecting the inv
23. OTOR INNER PROTECTOR TB1 2 3 4 5 TERMINAL BLOCK CT61 62 CURRENT TRANSFORMER R RESISTOR 61 62 63 FAN MOTOR RELAY DS61 DIODE MODULE RT61 DISCHARGE TEMPERATURE THERMISTOR X64 65 RELAY DS62 DIODE STACK RT62 DEFROST TEMPERATURE THERMISTOR X66 67 RELAY F801 FUSE 1A RT63 EVAPORATION TEMPERATURE THERMISTOR 2154 R V COIL F911 FUSE 1A RT65 FIN TEMPERATURE THERMISTOR 63H1 HIGH PRESSURE SWITCH L REACTOR RT66 67 GUS PIPE TEMPERATURE THERMISTOR 63H2 HIGH PRESSURE SWITCH L61 COMMON MODE CHOKE COIL RT68 GUS PIPE TEMPERATURE THERMISTOR NOTE 1 About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing SG79A845H01 2 Use copper conductors only For field wiring 3 Symboles below indicate Terminal block Connector MODELS MXZ 24UV 2 BRN GRY V BLK E 2 sik B SET e 1 1 NOISE FILTER Vet E 29 e f POWER SUPPLY GRNYLW P C BOARD E de CR E 9 ORN f 55 o 1 e 1 RELAY CIRCUIT BRAKER SI LDE GA oss DE m SS P C BOARD li H CN913 ry i oi ES UNIT A gt 220 9 5 ak SE Ss _ 50 INDOOR ON BU al Se UTI ee 7860 Se UNIT B gt erg H S 2157 a INDOOR __ oN jpg i LP MP C BOARD 82 unr BRL 1 Nee og CN851 ENG ELECTRONIC CONTROL P C BOARD CN792 CN793 CN722 CN663 CN662 CN661 112 13 4156 11213 415 6 1121314 112 11213 41516 718 112
24. THING CAPACITOR C62 C63 2 2 2500 400V 16 M21 17A 443 DIODE MODULE DS61 1 1 17 M21 17A 447 DIODE STACK DS62 1 1 18 T2W E40 452 I P M P C BOARD 1 1 09 T2W E40 441 RELAY P C BOARD 1 1 20 T2W E66 382 FUSE F801 F911 2 2 21 T2W E89 313 FUSE amp VARISTOR F912 NR63 1 3 15A 39 14 2 OUTDOOR UNIT STRUCTURAL PARTS MXZ 24UV E0 1 19 18 17 MXZ 24UV 15 14 m gt j I M HULLA YU 1 MILITANTS A I HL SS Part numbers that are circled are not shown in the illustration Symbol Q ty unit No Parts No Parts Name in Wiring MXZ 24UV E1 Remarks Diagram MXZ 24UV E2 1 M21 AS2 232 FRONT 1 2 M21 17A 245 SERVICE PANEL 3 T92 500 800 COMPRESSOR MC THV247FBA 4 M21 90V 646 EXPANSION VALVE T2W E70 653 EXPANSION VALVE COIL LEV C C room 5 T2W E95 653 LEV COIL T2W E95 655 EXPANSION VALVE T2W E70 651 EXPANSION VALVE COIL LEVA room 6 T2W E95 651 LEV COIL T2W E95 655 EXPANSION VALVE T2W E70 652 EXPANSION VALVE COIL LEV B B room 7 T2W E95 652 LEV COIL T2W E95 655 EXPANSION VALVE 8 T2W E79 290 BASE ASSEMBLY 9 M21 42E 644 UNION 10 T2W E40 247 PIPE COVER 11 M21 AN8 667 BALL VALVE 3 8 12 M21 HG1 667 BALL VALVE 5 8 13 T2W E70 248 REAR
25. at rated frequency 30 70 4 Indoor fan runs at HI speed and continues for 30 minutes 5 To cancel this operation press emergency run ON OFF button OAir flow speed or any button on remote controller GInverter output frequency 33Hz kgf cm Gauge MPa Gauge 8 7 T Q 5 c 6 E o 2 a 5 5 9 S 4 2 o O 3 2 15 20 25 30 35 EN Ambient temperature C Ambient humidity Ambient temperature C Ambient humidity 2 HEAT operation Indoor DB C 20 0 Outdoor DB c 2 7 15 20 0 WB C 14 5 WB C 1 6 12 14 5 Set air flow to Hi speed O Inverter output frequency is 45Hz Outdoor unit current A 0 5 10 15 20 25 Ambient temperature C 3 12 class unit in single operation NOTE The unit of pressure has been changed to MPa on the international system of units SI unit system The converted score against the traditional unit system can be gotten according to the formula below 1 MPa G 10 2 kgf cm G 1 COOL operation Both indoor and outdoor units are under the same temperature humidity condition lt How to work fixed frequency operation gt Dry bulb temperature C Relative humidity 1 Set emergency switch to COOL or HEAT The switch is locat ed on indoor unit 20 50 2 Press emergency run ON OFF button 25 60 3 Compressor starts running at rate
26. ation between compressor frequency and fan speed Indoor unit operation Fanspeed Single Double Triple 55 Hz Down 45 Hz 45 Hz 45 Hz Up 60Hz 45Hz 40 Hz Down 50 Hz 40 Hz 35 Hz Note When operation fan speed of Hi Low mode changes to VHi Hi mode by promoting those fan speeds respectively by 1 step after defrosting is operated This control is cleared when the compressor off When overheat protection of P C board temperature or fin temperature operates the outdoor fan speed is fixed to VHI mode regardless of compressor frequency Also when the overheat protection is cleared the fan speed is back to normal When the indoor coil thermistor is 57 C or more on HEAT operation fan speed is fixed to Low notch Or the indoor coil thermistor is 45 or less on HEAT operation fan speed is back to normal 11 8 Relation between main sensor and actuator Relation between main sensor and actuator Actuator Sensor Purpose Compressor LEV Outdoor Reversing fan motor valve Discharge temperature thermistor Indoor pipe temperature Defrosting thermistor Protection Protection Defrost thermistor Defrosting Evaporation temperature thermistor Gas pipe temperature thermistor High pressure switch Fin temperature thermistor Control Control Protection Protection Capacity code Control 23 12 TROUBLESHOOTING 12 1 Cautions on troubleshoo
27. ay W RED U BLK Output voltage COOL 100V 58Hz HEAT 100V 58Hz P C board Is voltage output 1 2 Turn on power supply to the outdoor ves Replace the electronic unit and after 1 minutes or more control P C board passed check the resistance Is output balanced with the I P M P C board between the connector CN551 pin 1 and pin 2 Turn off power supply of indoor and outdoor unit and measure the compressor winding resistance between the compressor terminals Is there resistance of 0 270 to 0 340 between the each terminals No 0Q Check the resistance between each terminal Infinite Replace the compressor After 1 minutes has passed since the Return the lead wire of compressor to former and power supply of outdoor unit was turn on power supply to indoor and outdoor unit turned off disconnect the connector Three minutes later EMERGENCY OPERATION starts CN 553 in the noise filter C board Check the resistance HPS 63H2 Clarify the causes by counting time until the inverter stops 0 to 10 seconds compressor rare short 10 to 60 seconds compressor lock V Infinite 60 seconds to 5minutes refrigerant circuit defective Bee Replace the 5 minutes or more normal relay P C board HPS 63H2 30 When thermistor is abnormal When the LED display is a table below Check of
28. d frequency 30 70 4 Indoor fan runs at HI speed and continues for 30 minutes 5 To cancel this operation press emergency run ON OFF button Air flow speed HI or any button on remote controller GInverter output frequency 33Hz kgf cm Gauge MPa Gauge Outdoor low pressure Outdoor unit current 35 15 20 25 30 35 20 25 30 Ambient temperature C Ambient humidity Ambient temperature C Ambient humidity 2 HEAT operation Indoor DB C 20 0 Outdoor DB C 2 7 15 20 0 WB C 14 5 WB C 1 6 12 14 5 Set air flow to Hi speed Inverter output frequency is 45Hz Outdoor unit current A 0 5 10 15 20 25 Ambient temperature C 4 18 class unit in single operation NOTE The unit of pressure has been changed to MPa on the international system of units SI unit system The converted score against the traditional unit system can be gotten according to the formula below 1 MPa G 10 2 kgf cm G 1 COOL operation O Both indoor and outdoor units are under the same temperature humidity condition lt How to work fixed frequency operation gt Dry bulb temperature C Relative humidity 1 Set emergency switch to COOL or HEAT The switch is locat ed on indoor unit 20 50 2 Press emergency run ON OFF button 25 60 3 Compressor starts running at rated frequency 30 70 4 Indoor fan runs at HI sp
29. e characteristic of the discharge temperature thermistor Refer to on page 31 Check the contact of P C board con nectors Fin temperature thermistor abnormality The compressor stops when a short or open circuit occurs in the fin tem perature thermistor during compressor running Check the characteristic of the fin temper ature thermistor Refer to O on page 31 Check the contact of P C board connec tors Overcurrent protection When over current is applied to the power module the compressor stops and restarts in 3 minutes Check the inverter and compressor Refer to on page 30 Check the amount of gas Check the indoor outdoor air flow for short cycle Check the indoor unit air filter for clogging Discharge temperature over heat protection When the discharge temperature thermistor detects 116 C or above the compressor stops and restarts operation in 3 minutes Protection will be released at 100 C or below Check the amount of gas and the refriger ant cycle Check the outdoor unit air passage Fin temperature overheat pro tection When the fin temperature thermistor detects 89 C or above the com pressor stops and restarts operation in 3 minutes Check the outdoor unit air passage Check the power module Check the outdoor fan motor Refer to on page 31 High pressure protection When the compressor starts primary current or output voltage s
30. eed 5 To cancel this operation press emergency run ON OFF button Air flow speed HI or any button on remote controller Inverter output frequency 33Hz kgf cm Gauge MPa Gauge Outdoor low pressure ol Outdoor unit current A 15 20 25 30 35 25 30 35 Ambient temperature C Ambient humidity Ambient temperature C Ambient humidity 2 HEAT operation Indoor DB C 20 0 Outdoor DB c 2 7 15 20 0 WB C 14 5 WB C 1 6 12 14 5 Set air flow to Hi speed O Inverter output frequency is 45Hz Outdoor unit current A Ambient temperature C 11 MICROPROCESSOR CONTROL INVERTER MULTI SYSTEM CONTROL MXZ 24UV E MXZ 24UV e EEE Output signal gt Input signal Compressor primary current Compressor secondary current Compressor Er kosete power Indoor unit factor microprocessor Outdoor unit control microprocessor Y SSR61 Drive circuit r Transistor i module Fin temperature thermistor RT65 i Comp Accumulator H P S 63H2 Discharge Hoe temperature EE HPS 63H1 5 V coil rdar tni 2154 Indoor Unit lt Muffler Indoor Gas pipe temperature Evaporation
31. erter controlled circuit when the voltage higher than the rated one is aupplied with the inverter controlled circuit 3 Noise filter P C board for E1 and E2 are not interchangeable Service parts have been changed as follows according to above change The value of R resistor has changed 100 gt 200 TB6 terminal block has been removed PART NAMES AND FUNCTIONS back and side Air inlet 2 OUTDOOR UNIT MXZ 24UV E MXZ 24UV 2 Model indication SCH Air outlet C 3 INDOOR OUTDOOR CORRESPONDENCE TABLE NOTE SLH 1AR is equivalent to class 09 9000BTU MCFH 13NV SEH 1 6AR SLH 1 6AR is equivalent to class 12 12000BTU MCFH 18NV SEH 2AR SLH 2AR is equivalent to class 18 18000BTU OUTDOOR UNIT MXZ 24UV E1 MXZ 24UV E2 07407 07 09 07 12 07 18 8 09 09 09 12 2 09 18 k 12 12 D 12 18 5 18 18 07 07 07 07 07 09 2 07407412 9 07407418 E 07 09 09 t 0740912 8 07 09 18 09 09 09 09 09 12 There is no combination other than this table 4 INDOOR UNITS COMBINATION MXZ 24UV Jeu MXZ 24UV 2 NOTE Electrical data is for outdoor unit only Cooling capacity kW Outdoor unit power consumption W Indoor units combination Unit B Unit C Cu
32. eter Extension pipe diameter class Pipe diameter For Liquid 6 35 1 4 Liquid 6 35 1 4 Liquid 6 35 1 4 07 09 Indoor unit Gas 9 52 3 8 Gas 9 52 3 8 Gas 12 7 1 2 Liquid 6 35 1 4 Liquid 6 35 1 4 Liquid 6 35 1 4 12 Indoor unit B Gas 12 7 1 2 Gas 12 7 1 2 Gas 12 7 1 2 Liquid 6 35 1 4 Liquid 6 35 1 4 Liquid 6 35 1 4 18 Indoor unit C Gas 15 88 5 8 Gas 15 88 5 8 Gas 9 52 3 8 11 10 PERFORMANCE CURVES The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions since operating conditions vary according to the areas where these units are installed The following information has been pro vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve 1 GUARANTEED VOLTAGE 198 264V 2 AIR FLOW Air flow should be set at MAX 3 MAIN READINGS 1 Indoor intake air wet bulb temperature CWB 2 Indoor outlet air wet bulb temperature CWB Cooling 3 Outdoor intake air dry bulb temperature CDB 4 Total input W 5 Indoor intake air dry bulb temperature CDB 6 Outdoor intake air wet bulb temperature CWB Heating 7 Total input W Indoor air wet dry bulb temperature difference on the left side of the chart on page 14 and 15 shows the difference between the indoor intake air wet dry bulb temperature and the indoor ou
33. ity lt HEAT gt Total input 15 0 15 15 1 0 1 0 1 0 1 0 0 5 0 5 0 5 0 5 0 50 100 150 Hz 0 50 100 150 Hz 0 50 100 150 Hz 0 50 100 150 Hz Frequency Frequency Frequency Frequency 3 12 class unit in single operation lt COOL gt Capacity lt COOL gt Total input JE HEAT Capacity e lt HEAT gt Total input 15 0 A 15 1 0 1 0 1 0 1 0 0 5 0 5 0 5 0 5 0 50 100 150 Hz 0 50 100 150 Hz 0 50 100 150 Hz 0 50 100 150 Hz Frequency Frequency Frequency Frequency 4 18 class unit in single operation lt COOL gt Capacity 5 COOL Total input lt HEAT gt Capacity lt HEAT gt Total input 15 0 1 5 1 0 1 0 1 0 1 0 0 5 0 5 0 5 0 5 0 50 100 150 Hz 0 50 100 150Hz 0 50 100 150 Hz 0 50 100 150 Hz Frequency Frequency Frequency Frequency 13 10 3 Outdoor low pressure and outdoor unit current 1 07 class unit in single operation NOTE The unit of pressure has been changed to MPa on the international system of units SI unit system The converted score against the traditional unit system can be gotten according to the formula below 1 MPa G 10 2 kgf cm 1 COOL operation Both indoor and outdoor units are under the same lt How to work fixed frequency operation gt temperature humidity condition 1 Set emergency switch to COOL or HEAT The switch is locat Dry bulb temperature C Relative humidity ed on indoor unit 20 50 2 Press emergency run ON OFF button 3 Compressor starts ru
34. n frequency controls are different See 10 2 Operational frequency range As far as the indoor unit velocity control goes refer to DRY operation in MICROPROCESSOR CONTROL in the indoor unit service manual When the outdoor unit operates When the other indoor unit operates 59 pulse Thermostat OFF in HEAT mode When the outdoor unit stops When the other indoor unit stops or thermo off Maintain LEV opening before stop 500 pulse in 15 minutes LEV opening for each indoor unit is determined by adding adjustment in accordance with the number of operating unit and the capacity class to standard opening based on the operation frequency Ex Opening 120 pulse in standard opening 1 Minimum 70 pulse Maximum 165 pulse Capacity code 4 at 1 unit operation Capacity code 1 at 4 unit operation After starting operation opening becomes the one that adjustment in accordance with discharge temperature was added to basic opening 1 Thermostat ON in HEAT mode x1 LEV opening when the outdoor unit operating Upper limit 500 Lower limit 59 Determination of LEV standard opening in each indoor unit The standard opening is on the straight line which connects an each standard point in the section where divided into seven according to the operation frequency of compressor as shown in the figure below LEV opening is controlled in proportion to the operation frequency Note Opening is adjusted at the standard opening acc
35. nd replace it board Outdoor unit does not operate LED display 22 Check of serial signal Check the indoor unit with referring to the indoor unit service manual 2 Turn off the power supply of the indoor and outdoor unit and return the indoor outdoor unit connecting wire to former original 3 Check the connection of indoor outdoor unit connecting wire in the outdoor unit terminal block and check the connection of the connector CN601 unit A CN 602 unit B CN603 unit C in the electronic control P C board 4 Disconnect the lead wire to the compressor Turn on the power supply indoor outdoor unit 3 minutes later EMERGENCY OPERATION starts Is there voltage of 5V DC 10V DC between No No 3 4 and N in the outdoor terminal block Replace the electronic control P C board Yes Recheck a connected circumstance of the indoor outdoor unit connecting wire 28 The cooling operation or heating operation does not operate LED display 22 Check of V coil e When heating operation does not work 1 Disconnect the lead wire leading to the compressor 2 Turn on power supply to the indoor and outdoor unit three minutes later EMERGENCY OPERATION HEAT operation starts t 1 Turn off power supply of indoor and outdoor unit and Is there voltage of 230V AC between pin1 and NO gt disconnect the connector CN851 CN852 in the electronic pin 2 at
36. nges air discharge direction Applied unit Model name Model code MXZ 24UV MAC 855SG 51H 855 610 4 150 534 5 86 109 4 386 Punxhed hole 51 8 4 8 LE BEDS VEU Mm E i 5 g6 5 g 988 Punxhed hole 534 MAC 855SG 42 2 MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE MITSUBISHI DENKI BLDG 2 2 3 MARUNOUCHI CHIYODA KU TOKYO100 8310 JAPAN O Copyright 2001 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Jan 2003 No OB287 REVISED EDITION A 7 Distributed in Oct 2001 No OB287 248 Made in Japan New publication effective Jan 2003 Specifications subject to change without notice
37. nning at rated frequency 25 60 4 Indoor fan runs at HI speed and continues for 30 minutes 30 70 5 To cancel this operation press emergency run ON OFF button or any button on remote controller Air flow speed HI GInverter output frequency 33Hz kgf cm Gauge MPa Gauge Outdoor low pressure Outdoor unit current 3 S 15 SCAS 15 20 25 30 35 20 25 30 Ambient temperature C Ambient humidity Ambient temperature C Ambient humidity 2 HEAT operation Indoor DB C 20 0 Outdoor pB C 2 7 15 20 0 WB C 14 5 WB C 1 6 12 14 5 O Set air flow to Hi speed Inverter output frequency is 45Hz Outdoor unit current A 0 5 10 15 20 25 Ambient temperature C 2 09 class unit in single operation NOTE The unit of pressure has been changed to MPa on the international system of units SI unit system The converted score against the traditional unit system can be gotten according to the formula below 1 MPa G 10 2 kgf cm G 1 COOL operation Both indoor and outdoor units are under the same temperature humidity condition lt How to work fixed frequency operation gt Dry bulb temperature C Relative humidity 1 Set emergency switch to COOL or HEAT The switch is locat ed on indoor unit 20 50 2 Press emergency run ON OFF button 25 60 3 Compressor starts running
38. or unit service manual and confirm that there is any problem in the indoor unit Then check the outdoor unit with referring to this page Operation start Check the outdoor unit LED indicator Check of power supply See page 28 woe uu Display other than Refer to indicator list See page 25 26 Indoor unit Cool or HEAT When cooling heat When cooling When heating When cooling serial signal opereation only exchanger of dew drops in the room doed not get room does not error Check of non operating indoor non operating warm cool Check of R V coil unit frosts indoor unit Check of Check of serial signal See page 29 When heating non Check of mis inverter compressor inverter See page 28 operating indoor unit piping See page 30 compressor gets warm Check mis piping See page 30 O Check of LEV Shortage of capacity See page 30 24 12 3 Troubleshooting check table Note LED indicates 2 in the normal status 7 segment LED display Error mode og Normal If there is defect in the following parts electronic control P C board relay P C board high pressure switches 63H1 63H2 indoor outdoor fan motor or indoor coil thermistor the compressor may stop even with the display remained at 42 In any case reset the breaker and check the above stated parts
39. ording to the indoor unit conditions However inclination of standard opening in each point of opening does not change with the original curve Add opening provided in Difference in Capacity in the table below to the standard opening from 1 to 8 when capacity of the indoor unit is excluding code 1 Add opening provided in Difference in Operation number in the table below to determined LEV opening for each indoor unit when 2 or 3 indoor units are operated at the same time Note Even when the adjusted standard opening exceeds the driving range from 59 to 500 pulse actual driving output opening is in a range from 59 to 500 pulse Calculation example of LEV opening Cool operation Compressor frequency 70Hz 2 unit ON 18class 170 150 80 60 x 70 60 150 75 30 205 pulse Standard opening 3 4 5 6 7 20 40 60 80 100 120 140 Operation frequency of compressor Hz F 19 Difference in Difference in 1 2 3 4 5 7 8 Code2 Code3 Code4 2 3 4 50 6 COOL 130 130 130 150 170 180 180 190 25 50 75 30 40 HEAT 120 130 140 155 170 185 200 215 15 30 45 10 40 50 Capacity code 1 2 3 4 Indoor unit 07 09 12 18 lt Correction gt Suction super heat MIN gas pipe temperature thermistor Evaporation temperature thermistor Each correction 1 Each gas pipe temperature thermistor Evaporation temperature thermistor Main pipe tem
40. otection decreases the frequency at the speed of 4Hz a minute and changes the outdoor fan to Low Note Temperature of the pipe temp thermistor is different depending on the indoor unit Temperature of the pipe temp thermistor is 45 C or less the protection control is Released 2 High pressure protection control by high pressure switch H P S High pressure switch controls the operation frequency and outdoor fan motor Control status When high pressure switch is ON When discharge pipe pressure is 2 75 MPa or more Control details a When cooling or drying The protection control decreases the compressor frequency at the speed of 10Hz a minute The compressor operates continuously in min frequency according to a command to decrease more than the min level b When heating The protection control decreases the compressor frequency at the speed of 10Hz a minute The protection control changes the outdoor fan to Low Release status When high pressure switch is OFF When discharge pipe pressure is 2 35 MPa or more Or the compressor stops 11 5 Discharge temperature protection control This protection controls the compressor ON OFF and operation frequency according to temperature of the discharge temp thermistor 1 Compressor ON OFF When temperature of the discharge temp thermistor exceeds 116 C the control stops the compressor When temperature of the discharge temp thermistor is 80 C or less the control
41. perature thermistor sub pipe temperature thermistor Discharge temperature x 1 Perform this when number of operation units is 2units or more 2 When the correction opening of suction super heat is 0 correct the LEV opening by dischaege temperature 1 LEV opening correction by suction super heat COOL DRY Suction super heat Minimum gas pipe temperature Evaporation temperature When COOL and DRY correct the LEV openings corrected from the table below Suction superheat S H LEV opening correction pulse more than 12 10 to12 8 to 10 6108 6 or less 2 Separate correction COOL DRY When number of operation unit is 2 units or more a Correction by the separate super heat Correct the LEV separately by temperature difference between each gas pipe temperature thermistor and evaporator temperature thermistor Calculate each super heat of the unit from the expression below Super heat Gas pipe temperature thermistor Evaporation temperature thermistor Select a minimum super heat from among them Correct an each LEV is corrected opening is corrected by difference between each super heat and minimum super heat Difference of LEV opening superheat correction pulse morethang 8 6 to9 6 3to 6 2 6 or less 0 20 3 LEV opening correction by discharge temperature When LEV correction output is 0 pulse by the suction super heat at cool or dr
42. quency Check points These symptoms do not mean any abnormality of the product but check the following points Air filter clogging Amount of gas d7 Frequency drop by defrosting When the indoor pipe temperature falls to 6 C or below during cooling Short cycle of indoor outdoor air flow y in cooling the compressor operates at reduced frequency ds Frequency drop by discharge When the discharge temperature exceeds 110 C the compressor oper d6 temperature protection ates at reduced frequency _ When the high pressure exceeds 2 75 28 kgf cm G the com d3 Hed OR PY d pres pressor operates at reduced frequency In addition the fan speed Ge E d3 p changes p ge AS Check the amount of gas I t Low discharge temperature He Je LET se EE Replace the outdoor controller board protection P p Check the contact of LEV board connec di tinuously ie Symptom Outdoor unit operates Display Detecting method Detecting method Check points 1 E T GE a short or open circuit occurs in the defrost thermistor during Defrost thermistor characteristic Y 9 Contact of P C board connectors E7 In this case the compressor continues to operate h u Power factor detection abnor When the compressor power factor cannot be detected Compressor wiring h4 mality In this case the compressor keeps running 26 12 4
43. rature again and check that the temperature does not change INDOOR UNIT OUTDOOR UNIT HEHE SEHE EE ERE ili Wet and dry bulb Wet and dry bulb thermometers thermometers FRONT VIEW BACK VIEW 10 1 CAPACITY AND THE INPUT CURVES Cooling capacity Total input cooling 75767 87 0 8 14 Ar 5 5 S 97 0 10 1 1 3 51 3 ZS 364 93 12 26 51 2 ng g 5 26 24 22 55 9 85 91 1 24 9 1 41 20 FE E 7 5 18 555 3 7 7 1 01 door 2251 0 vet C aj WE fom 20 8 air WB temperature 48 7 0 0 9 18 0 9 Indoor intake 27 30 35 40 43 27 30 35 40 43 Outdoor intake air DB temperature C Outdoor intake air DB temperature C 259 277 32 3 382 13 Heating capacity ae Total input heating 5 239256 208353 12 12 d S T 2 d e 26 H 219 234 273 324 11 NS 211 emne 20 S we Gi ait z i 19 9 21 3 24 9 294 E 10 ep et T oe wake Q E 17 9 19 2 224265 299 e Boo Og 9 nt g goa 17 0 19 9 23 5 gos 50 8 B 189149 17 4 206 07 97 11 9 12 8 14 9 17 6 oe 0 6 0 a a 10 LPS 2 10 15 10 5 0 5 10 15 E E E 5 Outdoor intake WB air temperature C Outdoor intake air WB temperature C 5 18 2 2 12 10 2 Capacity and input correction by inverter output frequency OUTDOOR UNIT MXZ 24UV NOTE 1 The dotted line on graphs connects the frequency range in normal operation shown by the full line and the frequency in test run shown by the point 1 07 class unit in single operation
44. rrent A 750 900 93 i 260 1040 ids 1440 12 260 1700 kid 5 0 2300 1540 07407 580 1960 7 44 1620 07 09 580 2050 7 83 2280 pe 580 2540 11 01 2980 07 18 580 3450 14 40 1900 09 09 580 2180 9 18 2730 2980 09 18 580 3450 14 40 2980 12 12 580 3450 1440 2980 12 18 580 3450 14 40 2980 18 18 580 3450 1440 1850 07 07 07 700 3650 8 94 07 07 09 700 4070 10 05 07 07 12 700 4070 10 05 07 07 18 708 4070 10 05 07 09 09 700 4070 10 05 07 09 12 700 4070 10 05 07 09 18 700 4070 10 05 09 09 09 700 4070 10 05 09 09 12 700 4070 10 05 NOTE SLH 1AR is equivalent to class 09 9000BTU MCFH 13NV SEH 1 6AR SLH 1 6AR is equivalent to class 12 12000BTU MCFH 18NV SEH 2AR SLH 2AR is equivalent to class 18 18000BTU NOTE Electrical data is for outdoor unit only Heating capacity KW Outdoor unit power consumption W Indoor units combination Unit B Unit C Current A 1130 od 270 1600 2 46 1320 09 270 1700 6 38 1900 2300 1930 2050 07 09 470 2680 9 90 8 6 2550 9 0 2730 8 0 2350 PE 470 3560 11 35 8 8 2640 9 0 2730 09 18 470 3880 13 19 9 0 2730 9 0 2730 9 0 2730 8 6 2420 07 07 07 520 5000 11 69 07 07 09 Si 520
45. s starts the compressor 2 Compressor operation frequency When temperature of the discharge temp thermistor is expected to be higher than 116 C the control decreases 12Hz from the current frequency When temperature of the discharge temp thermistor is expected to be higher than 111 C and less than 116 C the control decreases 6Hz from the current frequency When temperature of the discharge temp thermistor is expected to be higher than 104 C and less than 111 C the control is set at the current frequency 22 11 6 Refrigerant recovery control on heating lt Control status gt The control performs when the following status are satisfied everything When there is 1 unit or more not operating indoor unit on heat operation Excluding thermo OFF When discharge temperature becomes 107 C or more When it passed 60 minutes or more since the operation has started or the last refrigerant recovery has controlled Control details LEV opening which adjusts to not operating indoor unit is considered to be 80 pulse Control finish status The control finishes either as follows However the LEV opening is considered to be 59 pulse When it passed 60 seconds since the control has started When the discharge temperature is 90 or less 11 7 Outdoor fan control Fan speed is switched according to a number of operating indoor unit and the compressor frequency Fan speed Hi Low Min Compressor frequency Max Rel
46. ted frequency Maximum frequenc 8 10 of maximum frequency 9 10 of maximum frequency 7 10 of maximum frequency 11 3 Heat defrosting control 1 Conditions to enter defrosting mode When temperature of defrosting thermistor is 3 C or less When specified non defrosting time is counted in the control p c board is satisfied Total time of compressor operating Going to defrosting mode at both condition of and 2 Defrosting operation Compressor stops for 50 seconds Indoor fan is off Defrosting lamp lights 4 way valve reverses flow Compressor operates by the frequency in heat defrosting control 9 After compressor stops for 35 seconds 4 way valve reverses flow then defrosting finishes 3 Conditions to finish defrosting mode When the defrosting thermistor temperature is 8 C or more When it has spent 10 minutes for defrosting Defrosting finishes at condition of or 11 4 High pressure protection 1 High pressure protection control on heat mode Temperature of the main pipe temp thermistor in the indoor unit controls the operation frequency When temperature of the main pipe temp thermistor is approx 49 C the operation frequency is set at the current level When temperature of the main pipe temp thermistor is approx 52 C the protection control decreases the frequency at the speed of 3Hz a minutes When temperature of the main pipe temp thermistor is approx 57 C the pr
47. the control is OFF Replace the electronic control P C board 29 e When cooling heat exchanger of non operating indoor unit frosts e When heating non operating indoor unit get warm LED display 88 97 Check of LEV v Turn on power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely v Is click click sound heard Yes Or do you feel vibration of the LEV coil with a hand No Disconnect the connector CN791 unit A CN792 unit B CN793 unit C and measure the resistance of LEV coil to check the integrity d No Replace the LEV coil e When heating room does not get warm e When cooling room does not get cool LED display 22 48 Yes Replace the electronic control P C board Check of inverter compressor Start 1 Disconnect the lead wire to the compressor at terminals and turn on power supply to the indoor and outdoor unit Three minutes later EMERGENCY OPERATION starts Y x1 After the outdoor fan starts running wait for 1 minutes or more before Measure the voltage between measuring the voltage each leading to the compressor The output voltage values in the above table have the tolerance of 20 U BLK V WHT LED indicator the inverter No 1 Turn off power supply of the indoor stops due to over current and outdoor unit and disconnect V WHT W RED the connector CN 551 in the rel
48. thermistor LED Thermistor Symbol Connector Pin No Defrost thermistor RT62 Between CN661 pin1 and pin2 Discharge temperature thermistor RT61 Between CN661 pin3 and pin4 Evaporation temperature thermistor RT63 Between CN661 pin5 and pin6 F5 Gas pipe temperature thermistor Unit A Between CN662 pin1 and pin2 F6 Gas pipe temperature thermistor Unit B Between CN662 pin3 and pin4 F7 Gas pipe temperature thermistor Unit C Between CN662 pin5 and pin6 Fin temperature thermistor RT65 Between CN663 1 and pin2 Disconnect the connector in the electronic control C board see above table and Abnormal Replace the thermistor measure the resistance of thermistor to check whether the thermistor is normal or not y Normal Reconnect the connector CN661 CN662 and CN663 and disconnect the lead wire leading to the compressor Turn on power supply to the indoor and outdoor unit Three minutes later EMERGENCY OPERATION starts Y Does thermistor operate 10 minutes or more though the No Replace the electronic thermistor abnormality is not displayed control P C board Yes Fan motor does not operate Or fan motor stops at once after fan motor operates O Check of fan motor Check the connection of connector CN851 CN852 in the fan motor relay connector and electronic control P C board at the noise filter P C board and connector CN901 CN902 in the noise filter board
49. ting 1 Before troubleshooting check the following 1 Check the power supply voltage 2 Check the indoor outdoor connecting wire for mis wiring 2 Take care the following during servicing 1 Before servicing the air conditioner be sure to first turn off the remote controller to stop the unit and then after con firming the horizontal vane is closed turn off the breaker and or disconnect the power plug 2 Be sure to unplug the power cord before removing the front panel the cabinet the top panel and the electronic con trol P C board 3 When removing the electronic control 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 O igs Housing point x Lead wiring 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 If the electronic control P C board is supposed to be defective check the copper foil pattern for disconnection and the components for bursting and discoloration 3 When troubleshooting refer to the flow chart on this page and the check table on page 25 26 12 2 Instruction of troubleshooting Check the indoor unit with referring to the indo
50. tlet air wet dry bulb temperature for your refer ence 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 2 Attach at least 2 sets of wet and dry bulb thermometers to the outdoor air intake Cover the thermometers to prevent direct rays of the sun 3 Check that the air filter is cleaned 4 Open windows and doors of room 5 Press the EMERGENCY OPERATION switch once twice to start the EMERGENCY COOL HEAT MODE 6 When system stabilizes after more than 15 minutes measure temperature and take an average temperature 7 10 minutes later measure tempe
51. tops the compressor and restarts in 3 minutes Amount of gas Outdoor unit air passage Check the ball valve Room A gas pipe temperature thermistor abnormality When a short or open circuit occurs in the Room A gas pipe temperature thermistor Room A gas pipe temperature thermistor characteristic Contact of P C board connectors Room B gas pipe temperature thermistor abnormality Room C gas pipe temperature thermistor abnormality F7 When a short or open circuit occurs in the Room B gas pipe temperature thermistor When a short or open circuit occurs in the Room C gas pipe temperature thermistor Room B gas pipe temperature thermistor characteristic Contact of P C board connectors Room C gas pipe temperature thermistor characteristic Contact of P C board connectors 25 Symptom Display d8 d8 d3 d9 di Detecting method Frequency drop by current protection Frequency drop by overload protection Frequency drop by high pres Sure protection Outdoor unit operates The compressor operates at reduced frequency Detecting method When the outdoor unit input current exceeds 22 5 A the compressor operates at reduced frequency When the compressor load exceeds the specified value the compres Sor operates at reduced frequency When indoor pipe temperature exceeds 55 C during heating the com pressor operates at reduced fre
52. y operation or dry operating correct LEV is cor rected according to the following table The target discharge temperature is determined according to frequency zone and number of operation unit of the compressor Operation frequency COOL DRY HEAT f Number of operating unit Number of operating unit SPE Single Double Triple Quadruple Single Double Triple Quadruple 49 48 47 Minimum 20 51 60 62 64 21 30 57 64 66 65 68 73 31 40 52 51 50 41 55 56 70 71 90 91 maximum Discharge temperature more than Target discharge temperature 11 LEV opening correction pulse COOL HEAT Target discharge temperature 11 to Target discharge temperature 8 Target discharge temperature 8 to Target discharge temperature 5 Target discharge temperature 5 to Target discharge temperature 2 Target discharge temperature 2 to Target discharge temperature 2 Target discharge temperature 2 to Target discharge temperature 5 Target discharge temperature 5 to Target discharge temperature 8 Target discharge temperature 8 to Target discharge temperature 11 Target discharge temperature 11 or less 11 2 Operational frequency range Number of operating unit EE EE on 21 Note When the fan speed of indoor unit is totally Lo notch restrict the maximum frequency is restricted in 6 7 of the ra
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