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SERVICE MANUAL

1.
2. lt COOL gt Capacity lt COOL gt Total input lt HEAT gt Capacity HEAT Total input 2 0 2 0 2 0 2 5 2 0 1 5 1 5 1 5 1 5 1 0 1 0 1 0 1 0 0 5 i 0 5 2 0 5 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150Hz Frequency Frequency Frequency Frequency 2 09 class unit in single operation COOL Capacity COOL Total input HEAT Capacity lt HEAT gt Total input 2 0 2 0 2 0 2 0 1 5 1 5 1 5 1 5 1 0 1 0 1 0 1 0 0 5 0 5 0 5 0 5 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150Hz Frequency Frequency Frequency Frequency 3 12 class unit in single operation lt COOL gt Capacity lt COOL gt Total input lt HEAT gt Capacity lt HEAT gt Total input 2 0 2 0 2 0 2 0 1 5 1 5 1 5 1 5 1
3. lt COOL gt Capacity lt COOL gt Total input lt HEAT gt Capacity lt HEAT gt Total input 2 0 2 0 2 0 2 0 1 5 1 5 1 5 1 5 1 0 1 0 1 0 1 0 0 5 0 5 0 5 0 5 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150 Hz Frequency Frequency Frequency Frequency 2 09 class unit in single operation lt COOL gt Capacity lt COOL gt Total input lt HEAT gt Capacity HEAT Total input 2 0 2 0 2 0 2 0 1 5 1 5 1 5 1 5 1 0 1 0 1 0 1 0 0 5 0 5 0 5 0 5 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150Hz Frequency Frequency Frequency Frequency 3 12 class unit in single operation COOL Capacity COOL Total input HEAT Capacity HEAT Total input 2 0 2 0 2 0 2 0 1 5 1 5 1 5 1 5 1 0 1 0 1 0 1 0 0 5 0 5 0 5 0 5 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150 Hz Frequency Frequency Frequency Frequency 4 15 class unit in single operation lt COOL gt Capacity COOL Total input HEAT Capacity HEAT Total input 2 0 2 0 2 0 2 0 1 5 1 5 1 5 1 5 1 0 1 0 1 0 1 0 0 5 0 5 0 5 0 5 0 50 100 150Hz 0 50 100 150Hz 0 50 100 T50Hz 0 50 100 150Hz Frequency Frequency Frequency Frequency 5 18 class unit in single operation MXZ 5C42NA MXZ 3C24 30NAHZ only COOL Capacity COOL Total input HEAT Capacity HEAT Total input 2 0 2 0 2 0 2 0 1 5 1 5 1 5 1 5 1 0 1 0 1 0 1
4. pn Emme gt 2 way Capillary tube Outdoor Indoor unit D solenoid valve O D 0 10 x I D 0 02 x 39 37 heat exchanger 03 8 02 5 x 00 6 x 1000 Indoor unitE Outdoor heat exchanger Ambient temperature temperature Capillary tube ikermistor thermistor O D 0 16 x 1 0 0 11 x 3 94 RT68 2 24 0 x 92 8 x 100 Union T Defrost 1 4 i LEVA rainer 100 Capillary tube emperature ndoor unit A lt Strainer hermistor Strainer 100 LEVB 100 nu i rainer ngoor unite K o 1 Distributor 1 4 Strainer 100 LEV C Stop valve ndoor unit D 1 4 Strainer no LEVD lt Z S ndoor unit D lt lt gt AW Q 91 4 Strainer 100 LEVE ndoor unit E lt e AW Q OBH702A ii PO Operating Range MXZ 5C42NA Indoor intake air temperature Outdoor intake air temperature Maximum 95 FDB 71 FWB 115 FDB Cooling Minimum 67 FDB 57 FWB 14 FDB Maximum 80 FDB 67 FWB 75 FDB 65 FWB Heating Minimum 70 FDB 60 FWB 6 FDB 5 FWB MAX REFRIGERANT PIPING LENGTH amp PIPE SIZE SELECTION MXZ 5C42NA Piping length each indoor unit a b c d e 82 ft MAX Total piping length 262 ft MAX Bending point for each unit 25 MAX To
5. 6 7 8 23 5 8 6 7 8 Rear Air 2 13 16 4 19 32 L i 2 U Shaped Notched Hole 2 132 state Foundation Bolt M10 BB 3413 32 S a S amp X a m 2 Mon 4 8 Ren Side Air intake gt eom eom 8 amp pa n N 6 91 5 16 Drain Hole m A a m 9 Dichos Bee m 13 32 X t32 2 67 8 knockout hole 2 15 32 X1 13 32 Oval Hole 1 1 2 Connecting wire hole Foundation Bolt M10 4 5 8 3 07 8 punched hole 37 13 32 31325 13 19 32 H Connecting wire hole N ry n MS P Na 8 Sa Handle ROME al i J til Is 2 3 4 Air 5 II S unt o t ni ui GAS Ah Lia unt c 1 40635 FLARE E N GAS GAS 3 899 52 FLARE m es a 1 4 6 35 FLARE lt E Ee Unit A GAS 1 2 012 7 FLARE lt x N b 2 14 7 32 1 1 32 1 SPACE 5 E 2 o 5 gt 3 15 16 or more io a 5 E e B 4 e 2A c 3 15 16 _or more 13 25 32 or more 2 SERVICE SPACE 5 o ES ES d 3 15 16 or more Jr SS space 13 25 32 or more 13 25 32 or more OBH702A MXZ 5C42NA 1 3 32 punched hole Connecting wire hole 2 97 8 p
6. MXZ AC36NA MXZ 5C42NA 230 VDC Room A Room B Room Room D Room E 2 Input MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ rae CN601 gt 2 y 8 60 N611 CN621 2 CN741 d 50 Signal translation 0 n u Y Communication gt 1 wHT RED BHO0BS37B OL adaptor board 8 B a 30 THERE r du WW vy 3 10 i 3 gi S A 3 3 a 8 i HUN E A 4 e EN 4 14 32 50 68 86 104 F t iei tl ie 193 m i is ts bet i Temperature Thermistor R25 10 2 CN930 E B constant 3950 0 Tz 1 To fan motor m Rt 10exp 3950 57371 2754 298 t C F 32 1 8 gt _ F711 FUSE P T3 15AL250V CNAC Bus bur voltage zx to outdoor power 290 370 VDC board 208 230 VAC 15 VDC CAUTION Input Rotate instruction CN714 Base heater Constant voltage 94 0830 VAC Rotate signal i Input Pulse wave CNDC CN713 Valve coil Bus bur 208 230 VAC i Input voltage Bc uu CN712 R V coil VDC D coi 208 280 VAC Input cep nea CNTH2 7K oko Ambient temperature thermistor gt gt gt RT65 i L CNTH1 JOf 9 Outdoor heat exchanger mE temperature thermistor pa Te RT68 e ii on Discharge temperature i thermistor RT62 9 Defrost thermistor CN63H dii RT61 High pressure
7. BREAKER TAB1 x es Bulo wi NE TAB2 phase 60Hz ao F2 F1 4 WHT v RED w gt ps EET 3 9 BLU OUTDOOR CNAC1 POWER P C BOARD CNI71 1 CNDC CN151 CN152 CNAC2 RT64 le 1 9 0 3 16 o9 2 Rog n S 2 d esl a EISE ius MF ws a x x Yl 5 al 5 a ala 1 Q000000 7 1 3 10 7 110 2 1 3 D CNF1 CNDC CN702 CN701 CNAC TOINDOOR 30V UNIT No B e T801 F71 LED3 CN741 3 onN 1 5 OUTDOOR CONTROL PC BOARD r TT war 1802 BLU RED WHT ToINDOOR CN793 CN792 CN79 X714 4 oooo9 s 1 poooo s iooocols 5 RED LED CN601 SLL BLU NOTES I CNTH1 CNTH2 CN712 CN714 CN63H BLK 1 About yis naear 1 99l2 1 2 10 02 electic wiring diagram for servicing 5 5 5 i 2 Use copper conductors only A A A A 2154 rat akata RT61 RT62 RT68 RT65 LEVC LEVB LEVA HPS m minal black SYMBOL NAME SYMBOL NAME SYMBOL NAME SYMBOL NAME SYMBOL NAME NOTES CB1 3 SMOOTHING CAPACITOR 501 POWER MODULE PTC 1 2 CIRCUIT PROTECTION RT68 OUTDOOR HEAT EXCHANGER _ 1801 TRANSFORMER 1 propos du c blage lectrique FA FUSE T6 3AL 250V L REACTOR RT61 DEFROST THERMISTOR TEMPERATURE THERMISTOR TB1 4 TERMINAL BLOCK el F2 FUSE
8. E E 29 o BE TD so 2888 5220 CNDC 5508 Bus bur voltage CN171 OEC Output to drive compressor 290 370 VDCCNAC1 Connect to earth Fin temperature thermistor 208 230 V Output RT64 F1 FUSE T6 3AL250V CN152 F2 FUSE Signal T6 3AL250V Transmission From Outdoor Control P C board 5 VDC pulse wav Connect to earth f Joints I AGS oW o ooo NS ED M 9 naa OL MA TA 3 L IO T 07 o O 407 d j Tl 1 e HANDLING Connect to reactor Connect to reactor A White line Red line Connect PLE 208 230 VAC Input I to earth VAC Output Fin temperature thermistor RT64 200 180 160 g 140 9 120 c S 100 vw 80 o 60 40 20 0 0 10 20 30 40 50 60 70 80 32 50 68 86 104 122 140 158 176 F Temperature Thermistor R50 17 2 B constant 4150 3 Rt 17 4150 575 t C F 32 1 8 1 323 OBH702A 12 DISASSEMBLY INSTRUCTIONS lt Terminal with locking mechanism Detaching points gt 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
9. OBH702A Outdoor model MXZ 3C30NAHZ Indoor type Non Duct 09 09 12 Duct 09 09 12 Cooling Btu h 28 400 27 400 Capacity Heating 47 Btu h 28 600 27 600 Heating 17 Btu h 18 000 17 000 Cooling WwW 2 272 2 661 Heating 47 2 096 2 187 Heating 17 1 991 1 993 Cooling 12 5 10 3 SEER Cooling 18 0 16 0 HSPF IV V Heating 11 0 9 8 COP Heating 4 00 3 70 External finish Munsell 3 0Y 7 8 1 1 Power supply V phase Hz 208 230 1 60 Max fuse size time delay A 40 Min circuit ampacity A 29 9 Fan motor 1 9 Model MNB33FBTMC L Winding resistance at 68 F U V 0 30 V W 0 30 W U 0 30 20 28 8 Refrigerant control LEV Sound level 54 58 Defrost method Reverse cycle 37 13 32 Dimensions in 13 41 17 64 Weight I 189 Remote controller Wireless type Item Power consumption Compressor Control voltage by built in transformer 4 Refrigerant piping Not supplied optional parts Liquid 1 4 Valve size Gas A 1 2 B C 3 8 Indoor Flared Connection method Outdoor Flared Refrigerant charge R410A 8 Ib 13 oz Refrigeration oil Model NOTE Test conditions are based on ARI 210 240 37 4 FV50S Unit F Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling 1 A Cooling steady state
10. Compressor Remote controller Wireless type Control voltage by built in transformer 4 Refrigerant piping Not supplied optional parts Liquid in 1 4 Gas in A 1 2 B C D E 3 8 Indoor Flared Outdoor Flared Refrigerant charge R410A 8 Ib 13 oz Refrigeration oil Model 37 4 FV50S NOTE Test conditions are based on ARI 210 240 Valve size Connection method Unit F Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb 1 A Cooling steady state at rated compressor speed 80 67 95 75 B 2 Cooling steady state at rated compressor speed 80 67 82 65 B 1 Cooling steady state at minimum compressor speed 80 67 82 65 Low ambient cooling steady state at minimum compressor speed 80 67 67 53 5 Intermediate cooling steady state at intermediate compressor speed 80 67 87 69 1 Standard rating heating at rated compressor speed 70 60 47 43 2 Low temperature heating at maximum compressor speed 70 60 17 15 Maximum temperature heating at minimum compressor speed 70 60 62 56 5 High temperature heating at minimum compressor speed 70 60 47 43 Frost accumulation at rated compressor speed 70 60 35 33 Frost accumulation at intermediate compressor speed 70 60 35 33 OBH702A d Mode Test Cooling Heating Outdoor model MXZ 2C20NAHZ Indoo
11. R V coil OFF Refrigerant flow in heating ON gt Refrigerant flow in cooling 2 E Accumulator Compressor Be 7 D service port High pressure switch Compressor shell Uer temperature Sani thermistor port Union Header Gas 1 2 Stop valve Indoor unit A with service port L Maya Indoor units 995 gt gt naoor unt Sub Header Evaporator 3 8 Indoor unit C Outdoor 38 C un gt heat exch Indoor unit D eat exchanger Outdoor heat exchanger temperature Ambient M RA NEST thermistor Ly merus xs UMANE Tue RT68 thermistor 04 0 x 22 8 x 100 Capillary tube RT65 nion i 1 4 i LEVA Defrost temperature Indoor unit A 5 4 h Strainer EVB Strainer thermistor 100 100 Indoor unit CO Q kq G Distributor Strainer Strainer LEVC stributor co 91 4 100 Stop valve Indoor unit C 2 ae O14 300 LEV D lt Indoor unit D C AW Q OBH702A 25 Operating Range MXZ 4C36NA Indoor intake air temperature Outdoor intake air temperature Cooling Maximum 95 FDB 71 FWB 115 FDB Minimum 67 FDB 57 FWB 14 FDB Heating Maximum 80 FDB 67 FWB 75 FDB 65 FWB Minimum 70 FDB 60 FWB 6 FDB 5 FWB MAX REFRIGERANT PIPING LENGTH amp PIPE SIZE SELECTION MXZ 4C36NA Piping length
12. o 0 10 20 30 40 50 60 70 80 32 50 68 86 104 122 140 158 176 F Temperature Thermistor R50 17 kO 2 B constant 4150 3 Rt 17exp 4150 a3 t C F 32 1 8 OBH702A s From Outdoor Control P C board 5 VDC pulse wave Connect to earth CNAC2 1 208 230 VAC Connect to earth Output F1FUSE T6 3AL250V 208 230 VAC y Input F2 FUSE T6 3AL250V AC1 208 230 V Output 2 Outdoor power P C board MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ
13. NOTE Activate this function to confirm the correct wiring after replacing the outdoor control P C board Previous records are deleted when the outdoor control P C board is replaced The record cannot be shown if auto line correcting is not canceled Refer to How to activate this function OBH702A 9 11 TROUBLESHOOTING MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ 11 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 unit first with the remote controller and then after confirm ing 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 outdoor control P C board 3 When removing the electrical parts be careful of 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 connector housing DO NOT pull the lead wires Incorrect Correct Lead wiring Connector housing 3 Troubleshooting procedure 1 Ch
14. 6 7 8 23 5 8 6 7 8 Rear Air V niae 2 13 16 9 1 16 4 19 32 2 4 32 3 M 16 2 U Shaped Notched Hole w Foundation Bolt M10 13 32 1 343 324 s 2 m me m lt AS P amp 2 e LEN 65 5 S RE EAT Side Air Intake c gt i 8 V 4 N Air 13 32 6 91 5 16 Drain Hole M Discharge Q esz n 2 15 32 X1 13 32 Oval Hole tV 2 47 8 knockout hole f gundation Bel MEO 4 4 2 Connecting wire hole 1 5 8 37 13 32 31 32 13 119 32 3 7 8 punched hole Connecting wire hole Handle N SQQ A Handle Handle g N x N l m i Ll SEEN re R 4 4 06 39 FLARE o L m GAS 3 8 09 52 FLARE Ei it 1 4 66 35 FLARE L 1 4 6 3S FLAI 2 GAS Unit A GAS 1 2 012 7 FLARE FEM Ri IN 1 111 32 14 7132 1FREE SPACE 9 5 E g 9 5 E 5 5 _ 3 15 16 _ 5 X e r i 7 WITT 3 15 16 _or 13 25 32 or more Conduit plates OBH702A 2 5 SPAC 3 15 16 or more 15 16 or 3 m 3 19 11 16 or more SERVICE SPACE 13 25 32 13 25 32 or more t or more 13 Conduit connector MXZ 4C36NA Unit inch mm
15. amp d GAS Uni Lo 114 06 35 ELARE 4l LO Juri a f GAS 37810952 NIE sese 1 5 16 a Y 14 7 32 d ES k 1FREE SPACE o 8 5 g E Lock nut Conduit plate M 5 42 15716 or more m 9 D 2 a 2 K A 77777 3 15 16 or more 13 25 32 or more w 2 SERVICE SPACE 5 w El 2 ix 2 Conduit connector a ix 7 y d 3 15 16 or more SERVICE SPACE 13 25 32 or more 13 25 32 or t OBH702A is MXZ 3C24NAHZ MXZ 3C30NAHZ Unit inch mm 6 7 8 23 5 8 6 7 8 Rear Air V intake 2 13 16 i 9327 32 2 1 32 A 19 82 2 U Shaped Notched Hole 3 3 16 Foundation Bolt MO 13 32 pn a o B 1 8 s S m ES wu m 1 PS T x 4 22m Side Air Intake gt 95m 8 8 amp 4 m NI 1 3 32 punched hole 6 1 5 16 Drain Hole m 43
16. OCTAVE BAND SOUND PRESSURE LEVEL 0dB 20 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE F 63 125 250 500 1000 2000 BAND CENTER FREQUENCIES Hz MXZ 3C30NAHZ 4000 8000 FAN SPEED FUNCTION SPL dBu LINE High Cooling 54 o _e High Heating 58 o o 90 I SE q x i i i amp 80 4 F o x T I 1 F t P 1 FP 1 i ji ieu 8 F I NC 70 F ORE E 8 Ps SS m m 60 a i i i f 1 34 gt 50 i 8 T T i NES EE rx E N lt et ate qTocARLOL g a I X S 5 40 i P Y o o a z a i F 30 amp o H r 20 APPROXIMATE FL E THRESHOLD OF F HEARING FOR 3 E CONTINUOUS 7 NOISE F 10 63 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz 12 MXZ 3C24NA MXZ 3C30NA 5 OUTLINES AND DIMENSIONS Unit inch mm
17. Cooling Heating Cooling Heating Capacity 22 000 25 000 23 600 24 600 SHF Input 1 62 1 75 2 10 1 90 Electrical circuit Power supply V phase Hz 208 230 1 60 Input 1 554 1 684 1 920 1 780 Comp current 208 230V 7 47 1 6 76 8 1 7 32 9 23 8 35 8 56 7 74 Fan motor current 0 3 0 3 0 3 0 3 Refrigerant circuit Condensing pressure 395 310 419 345 Suction pressure 162 101 138 102 Discharge temperature 143 137 155 141 Condensing temperature 116 98 120 106 Suction temperature 59 36 50 34 Comp shell bottom temp 137 146 131 Ref pipe length Total pipe length for multi system 25 75 Refrigerant charge R410A 6l b 13oz Outdoor unit Intake air temperature DB 95 WB Fan speed Airflow MXZ 3C30NA Non Duct 09 09 12 Duct 09409412 Cooling Heating Cooling Heating Capacity 28 400 28 600 27 400 27 600 SHF Input 2 68 2 15 2 84 2 22 Electrical circuit Power supply V phase Hz 208 230 1 60 Input 2 614 2 084 2 650 2 090 Comp current 208 230V 12 57 11 37 10 02 9 06 12 74 11 52 10 05 9 09 Fan motor current 0 3 0 3 0 3 0 3
18. M NC 30 OCTAVE BAND SOUND PRESSURE LEVEL 0dB OCTAVE BAND SOUND PRESSURE LEVEL 0dB 20 APPROXIMATE 20 APPROXIMATE j THRESHOLD OF 5 THRESHOLD OF E HEARING FOR J 20 HEARING FOR F J ne 20 CONTINUOUS CONTINUOUS F NOISE I 1 NOISE 1 E 31 10 10 63 125 250 500 1000 2000 4000 8000 63 125 250 500 1000 2000 4000 8000 HAH BAND CENTER FREQUENCIES Hz BAND CENTER FREQUENCIES Hz MXZ 4C36NA FAN SPEED FUNCTION SPL dBa LINE High Cooling 54 ee High Heating 56 o o 90 J I 9 J x t FP f 4 a 80 F F F NE i i i 4 L C T mE RQ k E om a s s 3 5 1 e 60 i Eo i f nes 4 K i k ee rH E 50 4 L pl i i o 1 r FE f 2 F F i i NC 50 a 3 CERCLE a F T 3 E a no 5 40 1 9 1 ROM i NR we z 1 q F 2 1 F F 1 t F pm z 1 L I NC 30 i F F i s i OUTDOOR UNIT F r 20 APPROXIMATE F j THRESHOLD OF F F i HEARING FOR f F 4 39 4 CONTINUOUS 1 1985 er o4 MICROPHONE 63 125 250 500 1000 2000 4000 8000 BA
19. 9 3 16565656 565 7 1 2 1 6 o 9 3 N CNF1 CNDC CN702 CN701 CNAC MC E n TB3 X e T801 OUTDOOR CONTROL P C BOARD F711 WHT Sa 12 24V Z es mE tt cana aie IC801 i S CN611 O wHT eese LED2 1 00009 5 WHT CN741 CN791 x714 5 Q1Ioo009 5 gt RED c3 t LED1 O BLU 12 24V RED CN601 O TOINDOOR CNTH1 CNTH2 CN792 CN712 CN713 CN714 CN63H 91 BLK 208 2304 UNIT No A 119 9 900008 1100009 5 1 21 2 1 2 2 1 a gH gH 5 5 RED 2 2BLK BLK E B M 2184 2182 HPS TST BLK BLK H 26H RT6 RT62 I YW 2 es 2BLK BENE ALENA BLK 1 1BLK H SYMBOL NAME SYMBOL NAME NOTES 2 1 CB1 4 SMOOTHING CAPACITOR 11 12 REACTOR 1 About the indoor side electric wiring refer to the indoor unit Di ODE LED 1 3 LED electric wiring diagram for servicing x F1 F2_ FUSE T6 3AL 250V LEV A B EXPANSION VALVE 2 Use copper conductors only For field wiring F711 FUSE T3 15AL 250V MC COMPRESSOR 3 Symbols below indicate HPS HIGH PRESSURE SWITCH MF FAN MOTOR Terminal block 1C401_ DIODE BRIDGE T801 TRANSFORMER 659 connector 1411 POWER MODULE TB1 3 TERMINAL BLOCK 1C501_ POWER MODULE X52CA B RELAY NOTES IC801_ POWER DEVICE X65A_ RELAY 1A propos du c blage lectrique de c t int rieur se r f rer l unit int rieure c blage PTC1 3 CIRCUIT PROTECTION X712 RELAY sch ma lectrique pour l entretien RT61 DEFROST THERMISTOR X713 R
20. Check of R V coil When cooling operation does not work CNAC Outdoor control c CN712 P C board 1 Disconnect the lead wire leading to the compressor 2 3 minutes after turning ON the power supply start EMERGENCY CNAc2 Outdoor power OPERATION in COOL mode P C board Is there voltage of 208 230 VAC between pin 1 No in No Replace the outdoor and pin 2 at connector CN712 p p power P C board connector CNAC ye ves Turn OFF the power supply Replace the outdoor connector CNAC2 control P C board Is there normal resistance No Replace the R V coil z R V coil Refer to my en goll V Yes Replace the 4 way valve 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 Is there voltage of 208 230 VAC between 1 No and pin 2 at connector CN712 Replace the Away Vave Replace the outdoor control board OBH702A 18 kee When cooling heat exchanger of non operating indoor unit frosts When heating non operating indoor unit gets warm Check of LEV Turn ON the power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely Is click click sound heard Yes Or do you feel vibration of LEV coil wit
21. Refrigerant charge R410A 6 10 13 oz Outdoor unit Intake air temperature DB 95 WB Fan speed Airflow OBH702A 35 Model MXZ 5C42NA Indoor type Non Duct 06 09 09 09 09 Duct 09 09 09 09 09 Item Cooling Heating Cooling Heating Total Capacity 40 500 45 000 37 500 41 000 SHF Input 4 41 3 58 4 17 3 47 Electrical circuit Power supply V phase Hz 208 230 1 60 Input 4 300 3 465 3 870 3 270 Comp current 208 230V 20 67 18 7 16 66 15 07 18 61 16 83 15 72 14 22 Fan motor current 0 43 0 39 0 43 0 39 0 43 0 39 0 43 0 39 Refrigerant circuit Condensing pressure 466 305 446 326 Suction pressure 153 93 137 98 Discharge temperature 172 155 165 143 Condensing temperature 127 97 124 102 Suction temperature 53 27 47 29 Comp shell bottom temp 156 145 121 Ref pipe length Total pipe length for multi system Refrigerant charge R410A Model DB Intake air temperature WB Fan speed Airflow MXZ 2C20NAHZ Indoor type Non Duct 09 09 Duct 09 12 Item Cooling Heating Cooling Heating Total Capacity 18 000 22 000 20 000 22 000 SHF Inp
22. Weight 135 Remote controller Wireless type Control voltage by built in transformer 4 Refrigerant piping Not supplied optional parts Liquid 1 4 Valve size Gas A 1 2 B C 3 8 Indoor Flared Connection method i Outdoor Flared Refrigerant charge R410A 6lb 1302 Refrigeration oil Model NOTE Test conditions are based on ARI 210 240 Mode Test 24 7 FV50S Unit F Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling 1 A Cooling steady state at rated compressor speed 80 67 95 75 B 2 Cooling steady state at rated compressor speed 80 67 82 65 B 1 Cooling steady state at minimum compressor speed 80 67 82 65 Low ambient cooling steady state at minimum compressor speed 80 67 67 53 5 Intermediate cooling steady state at intermediate compressor speed 80 67 87 69 Heating 1 Standard rating heating at rated compressor speed 70 60 47 43 2 Low temperature heating at maximum compressor speed 70 60 17 15 Maximum temperature heating at minimum compressor speed 70 60 62 56 5 High temperature heating at minimum compressor speed 70 60 47 43 Frost accumulation at rated compressor speed 70 60 35 33 Frost accumulation at intermediate compressor speed 70 60 35 33 OBH702A I Outdoor model MXZ 4C36NA Indoor type Non Duct 09 09 09 09 Duct 09 09 0
23. F 2 HEAT operation Data is based on the condition of outdoor humidity 75 Set air flow to High speed Ginverter output frequency is 20 Hz _ IRN D LER 12121 16 er 9 gt Outdoor unit current A a mf 15 20 25 30 35 40 45 50 55 60 65 70 75 F Ambient temperature F OBH702A SS 12 24 class unit in single operation OUTDOOR UNIT MXZ 5C42NA MXZ 3C30NAHZ 1 COOL operation Data is based on the condition of indoor J r 4 humidity 5096 How to work fixed frequency operation MIT 1 Set emergency switch to COOL or HEAT The switch is located Air flow speed High GInverter output frequency 18 Hz aniindoor unit 2 Press emergency run ON OFF button 3 Compressor starts running at 18 Hz COOL or 20 Hz HEAT 4 Indoor fan runs at High speed and continues for 30 minutes 5 To cancel this operation press emergency run ON OFF button or any button on remote controller Pei i i Se a E h arte Se ed Outdoor low pressure Outdoor unit current A 130 0 0 65 70 75 80 85 90 95 100105 110 115 F 65 70 75 80 85 90 95 100105 110 115 F Ambient temperature F Ambient temperature F 2 HEAT operation Data is based on the condition of outdoor humidity 75 Set air flow to High speed GInverter o
24. Refrigerant circuit Condensing pressure 432 323 439 323 Suction pressure 137 97 132 99 Discharge temperature 159 136 165 136 Condensing temperature 122 101 124 101 Suction temperature 49 32 47 32 Comp shell bottom temp 145 121 156 128 Ref pipe length Total pipe length for multi system Refrigerant charge R410A Outdoor unit Intake air temperature DB WB Fan speed Airflow OBH702A 34 MXZ 4C36NA Non Duct 09 09 09 09 Duct 09 09 09 09 Cooling Heating Cooling Heating Capacity 35 400 36 000 34 400 34 400 SHF Input 3 76 3 02 3 94 3 10 Electrical circuit Power supply V phase Hz 208 230 1 60 Input 3 672 2 932 3 700 2 940 Comp current 208 230V 17 65 15 97 14 1 12 75 17 79 16 09 14 13 12 78 Fan motor current 0 3 0 3 0 3 0 3 Refrigerant circuit Condensing pressure 461 297 470 334 Suction pressure 141 89 129 91 Discharge temperature 172 138 176 147 Condensing temperature 127 95 129 103 Suction temperature 51 28 46 29 Comp shell bottom temp 162 165 139 Ref pipe length Total pipe length for multi system 25 100
25. aaa aja a 1 po00000 7 1 9 3 1 Oo O O J7 100 2 1 9J3 5 CNDC CN702 CN701 E To INDOOR CN621 0 V UNIT No B T801 F711 SH yw E LED3 5 CN741 3 orn 1 59699 5 OUTDOOR CONTROL P C BOARD r Nr LED OH wer TONDOOR YLW BLU RED WHT 1 30V UNIT No A CN794 CN793 CN792 CN791 X712 X714 199009 5 1loooool5 1000005 1100000 5 5 RED LED E nores 9 CN601 op BLU 1 About the indoor side electric CNTH1 CNTH2 CN712 CN714 BLK Wiring refer to the indoor unit 1 2 1 2 10 2 19 ole 1 electric wiring diagram for servicing 5 5 5 5 2 copper ue only or field wiring A Jd d d 2184 3 Symbole below RT61 RT62 RT68 LEVD LEVC LEVB LEVA HPS DOG comedor SYMBOL NAME SYMBOL NAME SYMBOL NAME SYMBOL NAME SYMBOL NAME NOTES 00 CB1 3 SMOOTHING CAPACITOR IC501 POWER MODULE PTC 1 2 CIRCUIT PROTECTION Rreg OUTDOOR HEAT EXCHANGER TRANSFORMER 1 propos du cablage electrique Fi FUSE T6 3AL 250V L REACTOR RT61 DEFROST THERMISTOR TEMPERATURE THERMISTOR TB1 5 TERMINAL BLOCK l unit int rieure c blage F2 FUSE T6 3AL 250V LED 1 3 LED mre DISCHARGE TEMP X52C RELAY oig REVERSING VALVE china F711 FUSE T3 15AL 250V LEVA D EXPANSION VALVE THERMISTOR X65 RELAY SOLENOID COIL 2 Utiiser des conducteurs HPS HIGH PRESSURE SWITCH MC COMPRESSOR RT64 FIN TEMP THERMISTOR X712 RELAY y Qn eue pour le c bla
26. GInverter output frequency 18 Hz On indoor unt 2 Press emergency run ON OFF button 3 Compressor starts running at 18 Hz COOL or 20 Hz HEAT 4 Indoor fan runs at High speed and continues for 30 minutes 5 To cancel this operation press emergency run ON OFF button or any button on remote controller ee m ss Outdoor low pressure Outdoor unit current A e 70 75 80 85 90 95 100 105 110 115 F Ambient temperature F Ambient temperature F 2 HEAT operation Data is based on the condition of outdoor humidity 75 Set air flow to High speed GInverter output frequency is 20 Hz 7 0 D gt Outdoor unit current A a 5 20 25 30 35 40 45 50 55 60 65 70 75 F Ambient temperature F OBH702A P lI a a i 10 15 class unit in single operation OUTDOOR UNIT MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ 1 COOL operation Data is based on the condition of indoor terre s s humidity 50 lt How to work fixed frequency operation gt MIT 1 Set emergency switch to COOL or HEAT The switch is located Air flow speed High GInverter output frequency 18 Hz aniindoor unit 2 Press emergency run ON OFF button 3 Compressor starts running at 18 Hz COOL or 20 Hz HEAT 4 Indoor fan runs at High speed and continues for 30 minutes 5 To cancel this operation press emergency run ON OFF button or any button on remote controller Brio ae a a Cassia Sa
27. SW1 switch O0RX ia gt LB SW871 CD oh 16 er SW872 o d oooo o oojooo ooooo H id Sw2 gt e C BERN V LED3 gt 3 EPT T uoom LED2 HN E E EEEEE LED1 S 58 88888 as 5 ga 5 Discharge temperature thermistor RT62 839822c 38 Esha nna i ose s sapo 5528 3333313 600 MoMMODI 6P52 2955 Q O on oe 5220 amp STSS9VESO SESO SEENE Q 500 gt gt So 2 gt OOOOO x 9 56822 6883 8 400 Vibe LEV 12 VDC S pulse wave i 300 N e 200 100 OO 40 20 30 40 50 60 70 80 90 100 110 120 C 32 50 68 86 104 122 140 158 176 194 212 230 248 Temperature Thermistor R100 13 36 2 B constant 4014 gi 1 nose sh 74 i OBH702A 2 Outdoor power P C board MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA RT64 5 e E E Se o S 8 go ello ooo ogsa 550 2068 5222 i gt gt Output to drive compressor Saba CN171 T Fin temperature thermistor CN152 Signal Transmission Nm WHT v WHT N os otto HS Connect to reactor onnect to reactor CNDC Red line White line Bus bur voltage 290 370 VDC Fin temperature thermistor RT64 200 o AER 88 o Resistance Boo o0 o
28. 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 Check of bus bar voltage Check the voltage of power supply Confirm outdoor unit failure mode recall function Refer to 11 2 2 Confirm LED1 indication lamp on the outdoor control P C board Blink 5 times Y Replace the outdoor power Replace the outdoor control P C board P C board X Y Y Turn ON power supply Start Turn ON power supply Start operation operation Y Y Confirm LED1 indication lamp Confirm LED1 indication lamp on the outdoor control P C eT gt Norma lt RTT on the outdoor control P C board Lighting Lighting board Blink 9 times Blink 9 times Y Y Replace the outdoor control Replace the outdoor power P C board X P C board X X Turn OFF power supply before removing P C board OBH702A m 11 7 TEST POINT DIAGRAM AND VOLTAGE 1 Outdoor control P C board MXZ 3C24NA MXZ 3C30NA Serial signal 12 24 V Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 100
29. 0 0 5 0 5 0 5 0 5 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150Hz Frequency Frequency Frequency Frequency 6 24 class unit in single operation MXZ 5C42NA MXZ 3C30NAHZ only COOL Capacity COOL Total input HEAT Capacity HEAT Total input 2 0 2 0 2 0 2 0 1 5 1 5 1 5 1 5 1 0 1 0 1 0 1 0 0 5 0 5 0 5 0 5 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150 Hz Frequency Frequency Frequency Frequency 43 OBH702A pe 8 4 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT 1 06 class unit in single operation OUTDOOR UNIT MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA 1 COOL operation Data is based on the condition of indoor r A ee ga a SCIT humidity 50 lt How to work fixed frequency operation gt a 1 Set emergency switch to COOL or HEAT The switch is located GAir flow speed High on Indoor unit Olnverter output frequency 24 Hz 2 Press emergency run ON OFF button 3 Compressor starts running at 24 Hz COOL 32 Hz HEAT 4 Indoor fan runs at High speed and continues for 30 minutes 5 To cancel this operation press emergency run ON OFF button or any button on remote controller lobe See oe see See eee e tu y eee iu e ow DI ee ee o We A eM ee LM Outdoor low pressure Outdoor unit current A 110 0 0 65 70 75 80 85 90 95 100 105 110 115 F 65 70 75 80 85 90 95 100 105 110 115 Ambient temperature F Ambient temperature F 2 HEAT operation Data is based on the c
30. 0 1 0 1 0 1 0 0 5 0 5 0 5 0 5 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150 Hz Frequency Frequency Frequency Frequency 4 15 class unit in single operation COOL Capacity COOL Total input HEAT Capacity HEAT Total input 2 0 2 0 2 0 2 0 1 5 1 5 1 5 1 5 1 0 1 0 1 0 1 0 0 5 0 5 0 5 0 5 0 50 100 T50Hz 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150Hz Frequency Frequency Frequency Frequency 5 18 class unit in single operation lt COOL gt Capacity lt COOL gt Total input lt HEAT gt Capacity HEAT Total input 2 0 2 0 2 0 2 0 1 5 1 5 1 5 1 5 1 0 1 0 1 0 1 0 0 5 0 5 0 5 0 5 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150Hz Frequency Frequency Frequency Frequency 6 24 class unit in single operation MXZ 3C30 4C36NA only COOL Capacity COOL Total input HEAT Capacity lt HEAT gt Total input 2 0 2 0 2 0 2 0 1 5 1 5 1 5 1 5 1 0 1 0 1 0 1 0 0 5 0 5 0 5 0 5 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150Hz 0 50 100 150 Hz Frequency Frequency Frequency Frequency OBH702A OUTDOOR UNIT MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ 1 06 class unit in single operation
31. 01 4 100 LEVC Indooruntc C MN amp 23 OBH702A Operating Range MXZ 3C24NA MXZ 3C30NA Indoor intake air temperature Outdoor intake air temperature Maximum 95 FDB 71 FWB 115 FDB Cooling Minimum 67 FDB 57 FWB 14 FDB Maximum 80 FDB 67 FWB 75 FDB 65 FWB Heating Minimum 70 FDB 60 FWB 6 FDB 5 FWB MAX REFRIGERANT PIPING LENGTH amp PIPE SIZE SELECTION MXZ 3C24NA MXZ 3C30NA Piping length each indoor unit a b c 82 ft MAX Total piping length a b c 230 ft MAX Bending point for each unit 25 MAX Total bending point 70 MAX lt is irrelevant which unit is higher Max height difference i Outdoor 49 ft A 49 ft Refrigerant pipe diameter is different according to indoor unit to be connected When using extension pipes refer to the tables below When the diameter of refrigerant pipe is different from that of outdoor unit union use optional Different diameter pipe For further information on Different diameter pipe refer to PARTS CATALOG OBH702A Unit inch Outdoor unit union diameter For Liquid 1 4 Indoor unit A Gas 1 2 Liquid 1 4 Indoor unit B Gas 3 8 Liquid 1 4 Indoor unit C Gas 3 8 24 MXZ 4C36NA Unit inch mm
32. 32 mu 13 32 y Connecting wire hole f Discharge 2 97 8 punched hole 2 15 32 X1 13 32 Oval Hole 2 15 16 Connecting wire hole Foundation Bolt M10 2 3 32 3 7 8 knockout hole 1 5 32 Connecting wire hole 37 13 32 31 32 13 19 32 gt 5 N HHI Handle Handle Air Intake 4 1 3 4 n E ath o mp a i N E 5 fe unit C Lia 174 66 35 FLARE Es RISE q k unit GAS 3 8 09 521FLARE Bb LIQ unit A LQ 1 4 6 35 FLARE GAS GAS 1 2 12 7 FLARE o o i a 14 7 32 1FREE SPACE 2 5 2 g Lock nut Conduit plate Top 5 S 5 315 16 or more amp 5 Conduit connector T g a 4 E d 1A M 3 15 16 or more 13 25 32 or more o 2 SERVICE SPACE 5 o 2 5 5 5 a 4 Lg Conduit plate Under 3 15 16 or more OBH702A 13 25 32 or more SERVICE SPACE 13 25 32 or more 17 6 WIRING DIAGRAM MXZ 3C24NA MXZ 3C30NA CIRCUIT
33. MC T801 OUTDOOR CONTROL P C BOARD F711 12 24V Z g Tania By IC801 onn CN611 O WHT On SS ne Gu 7 CN741 x712 N x713Q x7140 ooo99 5 1 ooooojs RED LED1 ol BLU 12 24 RED CN601 O INDOOR CNTH1 CNTH2 CN792 CN712 CN713 CN714 CN63H 9 BLK 208 230V UNIT No A 1999900 o o 2 Q1loooool5 1 21 2 1 2 2 1 O yy 4 5 5 5 RED 2 2BLK rut t t 2184 2182 B HPS TT TBIK BLK RT61 RT62 5 Ya oy 2BLK LEVC LEVA 195 oo SYMBOL NAME SYMBOL NAME NOTES i CB1 4 SMOOTHING CAPACITOR 11 12 REACTOR 1 About the indoor side electric wiring refer to the indoor unit Di ODE LED 1 3 LED electric wiring diagram for servicing F1 F2 FUSE T6 3AL 250V LEV A C EXPANSION VALVE 2 Use copper conductors only For field wiring F711 FUSE T3 15AL 250V MC COMPRESSOR 3 Symbols below indicate HPS HIGH PRESSURE SWITCH MF FAN MOTOR Terminal block IC401 DIODE BRIDGE TB0 TRANSFORMER connector IC411 POWER MODULE TB1 4 TERMINAL BLOCK 1 501 POWER MODULE X52CA B RELAY NOTES 1 801 POWER DEVICE X65A RELAY 1A propos du c blage lectrique de c t int rieur se r f rer l unit int rieure c blage PTC1 3 CIRCUIT PROTECTION X712 RELAY sch ma lectrique pour l entretien RT61_ DEFROST THERMISTOR X713 RELAY 2 Utiliser des conducteurs en cuivre pour le c blage RT62 DISCHARGE TEMP THERMISTOR X714 RELAY 3 Symbole
34. Not lighted The bus bar voltage exceeds 400 V or falls to low level during compressor operating Check the voltage of power supply Replace the outdoor control P C board 15 time flash LEV and drain pump Lighted Lighted The indoor unit detects an abnormality in the LEV and drain pump Refer to 11 6 Check of LEV Check the drain pump of the indoor unit NOTE Blinking patterns of this mode differ from the ones of Troubleshooting check table 11 4 OBH702A 61 11 3 INSTRUCTION OF TROUBLESHOOTING Check the indoor unit with referring to the indoor 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 LED 1 or LED 2 has blinked Both LED 1 and Refer to 11 6 Check of power supply Both LED1 and LED 2 are lighting LED2 are OFF Refer to 11 4 Troubleshooting check table OBH702A Indoor unit COOL or When cooling heat When cooling e When heating When cooling serial signal HEAT exchanger of dew drops in the room does not get room is not error operation only non operating indoor non operating warm cool Refer to 11 6 Refer to 11 6 unit frosts indoor unit Refer to 11 6 Refer to 11 6 How t
35. at rated compressor speed 80 67 95 75 B 2 Cooling steady state at rated compressor speed 80 67 82 65 B 1 Cooling steady state at minimum compressor speed 80 67 82 65 Low ambient cooling steady state at minimum compressor speed 80 67 67 53 5 Mode Test Intermediate cooling steady state at intermediate compressor speed 80 67 87 69 Heating 1 Standard rating heating at rated compressor speed 70 60 47 43 2 Low temperature heating at maximum compressor speed 70 60 17 15 Maximum temperature heating at minimum compressor speed 70 60 62 56 5 High temperature heating at minimum compressor speed 70 60 47 43 Frost accumulation at rated compressor speed 70 60 35 33 Frost accumulation at intermediate compressor speed 70 60 35 33 OBH702A 4 NOISE CRITERIA CURVES MXZ 3C24NA MXZ 3C30NA FAN SPEED FUNCTION SPL dBya LINE FAN SPEED FUNCTION SPL dBu LINE High Cooling 51 eo _e High Cooling 52 9 High Heating 55 oo High Heating 56 o o 90 90 80 80 70 70 0 0002 MICRO BAR 0 0002 MICRO BAR NC 70 NC 70 Ld M 60 60 NC 60 NC 60 50 50 NC 50 NC 50 40 40 NC 40 NC 40 30 30
36. charge R410A 8 Ib 13 oz DB 95 Intake air temperature i p u WB Fan speed Airflow OBH702A 37 8 1 OPERATING RANGE 1 POWER SUPPLY Model Rating Guaranteed Voltage MXZ 3C24NA MXZ 2C20NAHZ MXZ 3C30NA MXZ 3C24NAHZ 208 230 V 60 Hz 14 Min 198 208 V 230 V Max 253 V MXZ 4C36NA MXZ 3C30NAHZ MXZ 5C42NA Outdoor unit 2 OPERATION Intake air dor Function temperature Condition DB F DB F WB F A Cooling steady state at rated compressor speed B 2 Cooling steady state at rated compressor speed B 1 Cooling steady state at minimum compressor speed Low ambient cooling steady state at minimum compressor speed Intermediate cooling steady state at intermediate compressor speed Standard rating heating at rated compressor speed Low temperature heating at rated compressor speed Max temperature heating Heating at minimum compressor speed High temperature heating at minimum compressor speed Frost accumulation at rated compressor speed Frost accumulation at intermediate compressor speed 80 95 75 80 82 65 Cooling 80 82 65 80 67 53 5 80 87 69 70 47 43 70 17 15 70 62 70 47 70 35 70 35 OBH702A 2 3 24 MXZ 3C30NA MXZ 4C36NA MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ The standard specifications apply only to the ope
37. current exceeds 15 A These symptoms do not mean any abnormality of the product but check the following points Lighted High pressure protec tion The indoor gas pipe temperature exceeds 113 F during heating Check if indoor filters are clogged Check if refrigerant is short Defrosting in cooling The indoor gas pipe temperature falls 37 4 F or below during cooling Check if indoor outdoor unit air circulation is short cycled Lighted Discharge temperature protection The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 122 F COOL mode 104 F HEAT mode for more than 40 minutes Check refrigerant circuit and refrigerant amount Refer to 11 6 Check of LEV Refer to 11 6 Check of outdoor thermistors Ligh Low discharge temperature protection The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 102 2 F for more than 20 minutes Refer to 11 6 O Check of LEV Check refrigerant circuit and refrigerant amount Cooling high pressure protection The outdoor heat exchanger temperature exceeds 136 4 F during operation This symptom does not mean any abnormality of the product but check the following points Check if indoor filters are clogged Check if refrigerant is short Check if indoor outdoor unit air circulation is short cycled Outdoor
38. each indoor unit a b c d 82 ft MAX Total piping length atb c d 230 ft MAX Bending point for each unit 25 MAX Total bending point 70 MAX lt is irrelevant which unit is higher Max height difference Outdoor 49 ft 49 ft Refrigerant pipe diameter is different according to indoor unit to be connected When using extension pipes refer to the tables below When the diameter of refrigerant pipe is different from that of outdoor unit union use optional Different diameter pipe For further information on Different diameter pipe refer to PARTS CATALOG OBH702A Unit inch Outdoor unit union diameter For Liquid 1 4 Indoor unit A Gas 1 2 Liquid 1 4 Indoor unit B Gas 3 8 Liquid 1 4 Indoor unit C Gas 3 8 Liquid 1 4 Indoor unit D Gas 3 8 26 MXZ 5C42NA Unit inch mm R V coil OFF gt Refrigerant flow in heating z ON gt Refrigerant flow in cooling eere dus Accumulator Compressor Compressor shell Service port I temperature Oil separator thermistor RT62 High pressure switch Union Header Gas Service port lt H 01 2 Indoor unit A x 4 way valve X 5 3 8 b SET BARTS gt Indoor unit B lt f 2 3 8 Stop valve Header Evaporator Indoor unit C lt with service port lt IM
39. or open circuit is detected in the thermistor during operation Refer to 11 6 Check of outdoor thermistors Replace the outdoor control P C board Lighted 5 times Ambient temperature hermistor A short or open circuit is detected in the thermistor during operation Outdoor heat ex changer temperature hermistor A short circuit is detected in the thermistor during operation or an open circuit is detected in the thermistor after 5 minutes in cooling and 10 minutes in heating of compressor start up Defrost thermistor A short circuit is detected in the thermistor during operation or an open circuit is detected in the thermistor after 5 minutes of compressor start up Refer to 11 6 Check of outdoor thermistors 7 times Outdoor control system The nonvolatile memory data cannot be read properly Replace the outdoor control P C board 8 times Current sensor Current sensor protection cut out operates 2 con secutive times Replace the outdoor power P C board 11 times Communication error between P C boards The communication protection cut out between boards operates 2 consecutive times Check the connecting wire between outdoor con trol P C board and outdoor power P C board M NET communication error M NET adapter P C board detects an abnormality in the communication error Check the connecting wire between M NET adap
40. the outdoor control P C board 10 time flash Low discharge temperature protection Lighted Lighted The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 102 2 F for more than 20 minutes Check refrigerant circuit and refrig erant amount Refer to 11 6 Check of LEV 11 time flash Communication error between P C boards Lighted 6 times Communication error occurs between the out door control P C board and outdoor power P C board for more than 10 seconds The communication between boards protec tion cut out operates 2 consecutive times Check the connecting wire between outdoor control P C board and out door power P C board Current sensor Lighted A short or open circuit is detected in the cur rent sensor during compressor operating Current sensor protection cut out operates 2 consecutive times Zero cross detecting circuit 5 times Not lighted Zero cross signal cannot be detected while the compressor is operating The protection cut out of the zero cross detecting circuit operates 10 consecutive times Check the connecting wire among outdoor control P C board and out door power P C board Converter Not lighted A failure is detected in the operation of the converter during operation Check the voltage of power supply Replace the outdoor power P C board Bus bar voltage
41. unit operates normally 9 times Inverter check mode The unit is operated with emergency operation Switch Lighted Normal NOTE 1 The location of LED is illustrated at the right figure Refer to 11 7 1 2 LED is lighted during normal operation The flashing frequency shows the number of Example When the flashing frequency is 2 ON OFF 2 5 second OFF OBH702A D 0 5 second ON 2 5 second OFF imes the LED blinks after every 2 5 second OFF E 0 5 second ON 64 Outdoor control P C board Parts side LED1LED2 v vu Lighted gt e IT II AA lm U UE 11 5 TROUBLE CRITERION OF MAIN PARTS MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ Part name Check method and criterion Defrost thermistor RT61 Fin temperature thermistor RT64 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 Measure the resistance with a tester Refer to 11 7 Test point diagram and voltage 1 Outdoor control P C board 2 Outdoor power P C board for the chart of thermistor Discharge temperature thermistor RT62 Measure the resistance with a tester Before measurement hold the thermistor with your hands to warm it up Refer to 11 7 Test point diagram and voltage 1 Outdoor control P C board for the chart of thermistor Comp
42. winding The compressor uses about 50 W when pre heat control is turned ON Pre heat control is ON at initial setting How to deactivate pre heat control Turn OFF the power supply for the air conditioner before making the setting Set the 4 of SW2 on the outdoor control P C board to ON to deactivate pre heat control function Outdoor control P C board E LED D l SW L TI 6 SW2 coo 0101 aul Zr LJ LJ oO 123456 ooo COICO co SW871 Turn ON the power supply for the air conditioner NOTE Pre heat control will be turned OFF when the breaker is turned OFF OBH702A f pe 10 2 AUTO LINE CORRECTING Outdoor unit has an auto line correcting function which automatically detects and corrects improper wiring or piping Improper wiring or piping can be automatically detected by pressing the piping wiring correction switch SW871 When improper wiring or piping is detected wiring lines are corrected This will be completed in about 10 to 20 minutes How to activate this function 1 Check that outside temperature is above 32 F This function does not work when outside temperature is not above 32 F 2 Check that the stop valves of the liquid pipe and gas pipe are open 3 Check that the wiring between indoor and outdoor unit is correct If the wiring is not correct this function does not work 4 Tu
43. 1 4 66 35 FLARE Gas JUnit A GAS ECARE Conduit plate Top Conduit connector Lock Conduit plate Under MXZ 2C20NAHZ Unit inch mm 6 7 8 23 5 8 6 7 8 Rear Air Viniake 2 13 16 9 27 32 2 U Sh d Notched Hol aped Notched Hole 4 19 g2 3 Foundation Bolt M10 o lt 2 5 ci T 2 fun Side Air Intake gt _ A OS a amp m os a m wh f 6 91 5 16 Drain Hole B m Q 13 32 Air 13 32 mirc oe 9 Discharge u 91 3 32 punched hole 2 15 32 X1 13 32 Oval Hole Connecting wire hole Foundation Bolt M10 2 7 8 punched hole Connecting wire hole 37 13 32 31 32 13 19 32 m amp N Handle SITE Handle Handle Air Intake H B x 35 n n i x N Ny 2 3 4
44. 20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ Measure the resistance using a tester Part temperature 14 F 104 F Normal 0 35 0 50 kQ OBH702A 65 eee 11 6 TROUBLESHOOTING FLOW Outdoor unit does not operate Check of power supply Check the main power supply circuit for proper connections v Turn ON the power supply Y Is there voltage of 208 230 VAC in the No power supply terminal block Check the power supply cable Yes Is the output voltage from the outdoor Yes power P C board 294 325 VDC Replace the outdoor control P C board No vY Tum OFF the power supply and recconnect the reactor v Is the reactor short circuited peo Replace the reactor Yes Replace the outdoor power P C board OBH702A d 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 in every 0 5 second Outdoor unit does not operate How to check miswiring and serial signal error when outdoor unit does not work E Turn OFF the power supply 3 Y Is there rated voltage in No Check the power the power supply supply Yes LED indication for communication status Communication status is indicated by the LED Unit status Blinking normal communication Light
45. 3 41 17 64 Weight 189 Item Power consumption Remote controller Wireless type Control voltage by built in transformer 4 Refrigerant piping Not supplied optional parts Liquid 1 4 NEVE size Gas in A 1 2 B C 3 8 Indoor Flared Outdoor Flared Refrigerant charge R410A 8 Ib 13 oz Refrigeration oil Model 37 4 FV50S NOTE Test conditions are based on ARI 210 240 Connection method Unit F Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling 1 A Cooling steady state at rated compressor speed 80 67 95 75 B 2 Cooling steady state at rated compressor speed 80 67 82 65 B 1 Cooling steady state at minimum compressor speed 80 67 82 65 Low ambient cooling steady state at minimum compressor speed 80 67 67 53 5 Intermediate cooling steady state at intermediate compressor speed 80 67 87 69 Heating 1 Standard rating heating at rated compressor speed 70 60 47 43 2 Low temperature heating at maximum compressor speed 70 60 17 15 Maximum temperature heating at minimum compressor speed 70 60 62 56 5 High temperature heating at minimum compressor speed 70 60 47 43 Frost accumulation at rated compressor speed 70 60 35 33 Frost accumulation at intermediate compressor speed 70 60 35 33 Mode Test
46. 5 14 23 32 41 50 59 Seg S z SP SI ast oN Outdoor intake air Wet bulb temperature F 25 5 2 s a Es 8 9 5 E Total input Heating at Rated frequency 555 8 oT XY 525 5 1 2 79 68 9 14 Ture 59 lt 1 0 5 0 9 te a zF nde u E 0 8 22 2 207 20 6 0 5 0 4 AMXZ 5C42NA MXZ 3C24 30NAHZ 5 14 23 32 41 50 59 Outdoor intake air Wet bulb temperature F 2MXZ 5C42NA MXZ 3C30NAHZ NOTE The above broken lines are for the heating operation without any frost and defrost operation OBH702A i 8 3 CAPACITY AND INPUT CORRECTION BY MEANS OF INVERTER OUTPUT FREQUENCY OUTDOOR UNIT MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA 1 06 class unit in single operation
47. 6 0 HSPF IV V Heating 9 8 9 2 COP Heating 4 20 3 80 External finish Munsell 3 0Y 7 8 1 1 Power supply V phase Hz 208 230 1 60 Max fuse size time delay A 25 Min circuit ampacity A 22 1 Fan motor 1 9 Model SNB220FQGMC Winding resistance Compressor at 68 F U V 0 95 V W 0 95 W U 0 95 12 13 7 Refrigerant control LEV Sound level 51 55 Defrost method Reverse cycle 37 13 32 Dimensions 13 31 11 32 Weight 135 Remote controller Wireless type Control voltage by built in transformer 4 Refrigerant piping Not supplied optional parts Liquid 1 4 Valve size Gas A 1 2 B C 3 8 Indoor Flared Connection method Outdoor Flared Refrigerant charge R410A 6lb 13oz Refrigeration oil Model NOTE Test conditions are based on ARI 210 240 Mode Test 24 7 FV50S Unit F Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling 1 A Cooling steady state at rated compressor speed 80 67 95 75 B 2 Cooling steady state at rated compressor speed 80 67 82 65 B 1 Cooling steady state at minimum compressor speed 80 67 82 65 Low ambient cooling steady state at minimum compressor speed 80 67 67 53 5 Intermediate cooling steady
48. 80 67 82 65 Low ambient cooling steady state at minimum compressor speed 80 67 67 53 5 Intermediate cooling steady state at intermediate compressor speed 80 67 87 69 Heating 1 Standard rating heating at rated compressor speed 70 60 47 43 2 Low temperature heating at maximum compressor speed 70 60 17 15 Maximum temperature heating at minimum compressor speed 70 60 62 56 5 High temperature heating at minimum compressor speed 70 60 47 43 Frost accumulation at rated compressor speed 70 60 35 33 Frost accumulation at intermediate compressor speed 70 60 35 33 OBH702A Mode Test MXZ 5C42NA Non Duct 06 09 09 09 09 Duct 09 09 09 09 09 40 500 37 500 45 000 41 000 24 400 23 000 4 403 4 112 Heating 47 3 575 3 463 Heating 17 2 943 2 869 Cooling 9 2 9 0 SEER Cooling 19 7 15 2 HSPF IV V Heating 10 3 9 1 COP Heating 3 69 3 47 External finish Munsell 3 0Y 7 8 1 1 Power supply V phase Hz 208 230 1 60 Max fuse size time delay A 40 Min circuit ampacity A 31 9 Fan motor 1 9 Model MNB33FBTMC L Winding resistance at 68 F U V 0 30 V W 0 30 W U 0 30 20 28 8 Refrigerant control LEV Sound level 56 58 Defrost method Reverse cycle 37 13 32 Dimensions in 13 41 17 64 Weight 189 Outdoor model Indoor type Cooling Btu h Heating 47 Btu h Heating 17 Btu h Cooling W Item Capacity Power consumption
49. 9 09 Cooling Btu h 35 400 34 400 Capacity Heating 47 Btu h 36 000 34 400 Heating 17 Btu h 26 600 26 600 Cooling 3 760 3 940 Heating 47 3 020 3 100 Heating 17 3 340 3 450 EER Cooling 9 4 8 7 SEER Cooling 19 2 16 0 HSPF IV V Heating 11 0 9 8 COP Heating 3 50 3 25 External finish Munsell 3 0Y 7 8 1 1 Power supply V phase Hz 208 230 1 60 Max fuse size time delay 25 Min circuit ampacity 22 1 Fan motor 1 9 Model SNB220FQGMC Winding resistance 7 _ Compressor at 68 F U V 0 95 V W 0 95 W U 0 95 12 13 7 Refrigerant control LEV Sound level 54 56 Defrost method Reverse cycle 37 13 32 Dimensions in 13 31 11 32 Weight I 137 Remote controller Wireless type Control voltage by built in transformer 4 Refrigerant piping Not supplied optional parts Liquid in 1 4 Gas in A 1 2 B C D 3 8 Indoor Flared Outdoor Flared Refrigerant charge R410A 6lb 1307 Refrigeration oil Model 24 7 FV50S NOTE Test conditions are based on ARI 210 240 Item Power consumption Valve size Connection method Unit F Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling 1 A Cooling steady state at rated compressor speed 80 67 95 75 B 2 Cooling steady state at rated compressor speed 80 67 82 65 B 1 Cooling steady state at minimum compressor speed
50. AT The switch is located on indoor unit 2 Press emergency run ON OFF button 3 Compressor starts running at 24 Hz COOL or 32 Hz HEAT 4 Indoor fan runs at High speed and continues for 30 minutes 5 To cancel this operation press emergency run ON OFF button or any button on remote controller D m I MIA ccc EMEN 5 0 5 lt 2 o4 a 5 o o 5 S3 5 140 22 1 0 j 120 0 0 65 70 75 8 SN i 1 95 i 65 70 75 80 85 90 95 100105 110 115 Ambient temperature F Ambient temperature F 2 HEAT operation Data is based on the condition of outdoor humidity 75 Set air flow to High speed GInverter output frequency is 32 Hz Outdoor unit current A 2 0 15 20 25 30 35 40 45 50 55 60 65 70 75 Ambient temperature F OBH702A AT pe 5 18 class unit in single operation OUTDOOR UNIT MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA 1 COOL operation Data is based on the condition of indoor humidity 5096 Air flow speed High lnverter output frequency 24 Hz How to work fixed frequency operation 1 Set emergency switch to COOL or HEAT The switch is located on indoor unit 2 Press emergency run ON OFF button 3 Compressor starts running at 24 Hz COOL or 32 Hz HEAT 4 Indoor fan runs at High speed and continues for 30 minutes 5 To cancel this operation press emergency run ON OFF button or any button on remo
51. Ambient temperature F 2 HEAT operation Data is based on the condition of outdoor humidity 75 Set air flow to High speed lnverter output frequency is 32 Hz Outdoor unit current A Ambient temperature F OBH702A M EE 7 06 class unit in single operation OUTDOOR UNIT MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ 1 COOL operation Data is based on the condition of indoor r cco0000c humidity 5096 How to work fixed frequency operation E 1 Set emergency switch to COOL or HEAT The switch is located Air flow speed High on indoor unit Inverter output frequency 18 Hz 2 Press emergency run ON OFF button 3 Compressor starts running at 18 Hz COOL or 20 Hz HEAT 4 Indoor fan runs at High speed and continues for 30 minutes 5 To cancel this operation press emergency run ON OFF button or any button on remote controller NZ Z 2 ccr ccc cc n Outdoor low pressure Outdoor unit current A os 70 75 80 85 90 95 100 105 110 115 F Ambient temperature F Ambient temperature F 2 HEAT operation Data is based on the condition of outdoor humidity 75 Set air flow to High speed GInverter output frequency is 20 Hz 7 0 D gt Outdoor unit current A a 5 20 25 30 35 40 45 50 55 60 65 70 75 F Ambient temperature F OBH702A me SSS 8 09 class unit in single operation OUTDOOR UNIT MXZ 5
52. BISHI ELECTRIC CORPORATION Distributed in Oct 2014 No OBH702 REVISED EDITION A Distributed in Sep 2014 No OBH702 New publication effective Oct 2014 Made in Japan Specifications are subject to change without notice OBH702A d
53. C lt S Ay Q OBH702A 31 pO Operating Range MXZ 3C24NAHZ MXZ 3C30NAHZ Indoor intake air temperature Outdoor intake air temperature Maximum 95 FDB 71 FWB 115 FDB Cooling Minimum 67 FDB 57 FWB 14 FDB Maximum 80 FDB 67 FWB 75 FDB 65 FWB Heating Minimum 70 FDB 60 FWB 12 FDB 13 FWB MAX REFRIGERANT PIPING LENGTH amp PIPE SIZE SELECTION MXZ 3C24NAHZ MXZ 3C30NAHZ Piping length each indoor unit a b c 82 ft MAX Total piping length a b c 230 ft MAX Bending point for each unit 25 MAX Total bending point 70 MAX is irrelevant which unit is higher Max height difference i Outdoor 49 ft A 49 ft Refrigerant pipe diameter is different according to indoor unit to be connected When using extension pipes refer to the tables below When the diameter of refrigerant pipe is different from that of outdoor unit union use optional Different diameter pipe For further information on Different diameter pipe refer to PARTS CATALOG OBH702A Unit inch Outdoor unit union diameter For Liquid 1 4 Indoor unit A Gas 1 2 Liquid 1 4 Indoor unit B Gas 3 8 Liquid 1 4 Indoor unit C Gas 3 8 32 PUMPING DOWN When relocating or disposing of the air conditioner pump down the system following the procedure belo
54. C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ Cooling capacity at Rated frequency 79 11 3 13 8 13 5 17 1 15 6 1 5 Indoor intake air Wet bulb temperature F 79 72 68 64 23 32 41 50 59 68 77 86 95 104 113 Outdoor intake air Dry bulb temperature F Indoor air Wet bulb temperature difference degree Indoor unit class Inverter output frequency Total input Cooling at Rated frequency 1 3 o 2 1 2 E TI s 14 64 2 1 0 o 5 09 7 0 8 Indoor intake air Wet bulb temperature F 14 23 32 4 50 59 68 77 86 95 104 113 Outdoor intake air Dry bulb temperature F Heating capacity at Rated frequency 243 p 340 4487 49 1 533 398 1 cn s 22 5 1 2 79 ST 5 xe ge 205 511 jov 9 185 223 5 1 0 aS n Be 166 50 9 a ER Pb 148 Teen deft Sel 0 8 M o gt ze 13 0 907 912 So gt 5 110 gt 2 9 2 0 5 2 7A 0 4 Sg 25 Ba 24 2
55. C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ 1 COOL operation Data is based on the condition of indoor emesene humidity 5096 How to work fixed frequency operation MIT 1 Set emergency switch to COOL or HEAT The switch is located Air flow speed High GInverter output frequency 18 Hz aniindoor unit 2 Press emergency run ON OFF button 3 Compressor starts running at 18 Hz COOL or 20 Hz HEAT 4 Indoor fan runs at High speed and continues for 30 minutes 5 To cancel this operation press emergency run ON OFF button or any button on remote controller Pei SUS Se ee a a ee Sa ee oO ee eed Outdoor low pressure Outdoor unit current A 0 45 70 75 80 85 90 95 100 105 110 115 F Ambient temperature F Ambient temperature F 2 HEAT operation Data is based on the condition of outdoor humidity 75 Set air flow to High speed GInverter output frequency is 20 Hz Outdoor unit current A 5202 5 30 35 40 45 50 55 60 65 70 75 F Ambient temperature F OBH702A Ww PO 9 12 class unit in single operation OUTDOOR UNIT MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ 1 COOL operation Data is based on the condition of indoor r 4 humidity 5096 How to work fixed frequency operation MT 1 Set emergency switch to COOL or HEAT The switch is located Air flow speed High
56. Condensing pressure 397 302 377 329 Suction pressure 164 106 136 109 Discharge temperature 144 122 152 127 Condensing temperature 114 97 115 103 Suction temperature 59 42 48 36 Comp shell bottom temp 128 136 109 Ref pipe length Total pipe length for multi system Refrigerant charge R410A Model DB Intake air temperature WB Fan speed Airflow MXZ 3C30NAHZ Indoor type Non Duct 09 09 12 Duct 09 09 12 Item Cooling Heating Cooling Heating Total Capacity 28 400 28 600 27 400 27 600 SHF Input 2 28 2 10 2 67 2 19 Electrical circuit Power supply V phase Hz 208 230 1 60 Input 2 214 2 031 2 480 2 060 Comp current 208 230V 10 64 9 63 9 76 8 83 11 92 10 78 9 9 8 96 Fan motor current 0 43 0 39 0 43 0 39 0 43 0 39 0 43 0 39 Refrigerant circuit Condensing pressure 404 321 416 329 Suction pressure 146 103 131 107 Discharge temperature 146 131 153 128 Condensing temperature 117 101 118 103 Suction temperature 52 35 45 35 Comp shell bottom temp 129 111 135 108 Ref pipe length Total pipe length for multi system 25 70 Refrigerant
57. ELAY 2 Utiliser des conducteurs en cuivre pour le cablage RT62 DISCHARGE TEMP THERMISTOR X714 RELAY 3 Symbole ci dessous indique RT64 FIN TEMP THERMISTOR 2192 2WAY VALVE SOLENOID COIL bornier RT65_ AMBIENT TEMP THERMISTOR 21S4 REVERSING VALVE SOLENOID COIL oo g connecteur RT68 OUTDOOR HEAT EXCHANGER 26H HEATER PROTECTOR EMPERATURE THERMISTOR H DEFROST HEATER OBH702A 21 MXZ 3C24NAHZ MXZ 3C30NAHZ CIRCUIT Z B 1 BREAKER lt POWER SUPPLY 208 230V IC501 Gani L2 3U t phase 60Hz b BLK U 1 O O O OUTDOOR POWER BOARD TBE1 TBE2 TBE3 TBE4 CNAC2 CN171 1l99999099 7 1190 Q 2 i li o Q3 1 92 2 CNMC r x x x x x zl l l MF a am m m oj m BLK RED x xd 5 RT64 i 1 a aj TO INDOOR OV UNIT No C U ow 1 7 165555 7 i1 6 2 1 0 9 3 TN CN702 CN701 CNAC
58. MITSUBISHI Revision A MXZ 3C24NA MXZ 3C30NA and MXZ ELECTRIC 4C36NA have been added Please void OBH702 SPLIT TYPE AIR CONDITIONERS OUTDOOR UNIT 702 utilized REVISED EDITION A SERVICE MANUAL Models MXZ 3C24NA MXZ 3C30NA Indoor unit service manual MSZ FE NA Series OBH542 E MFZ KA NA Seis OSHC MXZ 5C42NA SEZ KD NA Series MXZ 2C20NAHZ PCA A KA CHER MXZ 3C24NAHZ 512 Series OCH487 MXZ 3C30NAHZ rcu e CONTENTS 1 TECHNICAL CHANGES 2 2 PART NAMES AND FUNCTIONS 3 aS GPECIEICATIONS A BM LEE 4 4 NOISE CRITERIA 11 5 OUTLINES AND DIMENSIONS 13 6 WIRING DIAGRANM 18 7 REFRIGERANT SYSTEM DIAGRAM 23 SuDATA rere eee DIDI 34 9 ACTUATOR 56 10 SERVICE FUNCTIONS 57 11 TROUBLESHOOTING 59 12 DISASSEMBLY INSTRUCTIONS 77 ean INDOOR UNITS COMBINATION TABLES MXZ 3C30NA ch s PARTS CATALOG OBB702 ir SA MATO
59. ND CENTER FREQUENCIES Hz NAS Test conditions Cooling Dry bulb temperature 95 F Wet bulb temperature 75 F Heating Dry bulb temperature 45 F Wet bulb temperature 43 F OBH702A MXZ 5C42NA 90 FAN SPEED FUNCTION SPL dBya LINE High Cooling 56 High Heating 58 80 70 0 0002 MICRO BAR 60 50 40 30 OCTAVE BAND SOUND PRESSURE LEVEL 0dB 20 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 10 r 4 63 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz MXZ 3C24NAHZ FAN SPEED FUNCTION SPL dBya LINE High Cooling 54 High Heating 58 90 80 70 0 0002 MICRO BAR 60 50 40 30 OCTAVE BAND SOUND PRESSURE LEVEL 0dB 20 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 10 63 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz OBH702A MXZ 2C20NAHZ FAN SPEED FUNCTION SPL dBw LINE High Cooling 54 ee High Heating 58 o O 90 80 70 0 0002 MICRO BAR 60 50 40 30
60. OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0 5 seconds Blinks The outdoor unit is abnormal Beep is emit o ted at the same timing as the blinking of the OFF OPERATION INDICATOR lamp 2 OFF Yes Blinks The outdoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the outdoor unit failure mode table 11 2 3 Make sure to check at least two consecutive blinking cycles X2 Y The outdoor unit is normal Release the failure mode recall functio Y Release the failure mode recall function X3 Y Repair the failure parts Y Delete the memorized abnormal condition X Y Release the failure mode recall function 3 NOTE 1 Make sure to release the failure mode recall function after it is 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 X2 Blinking 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 8 gt ss F st gt gt he usd OFF r N gt 4 gt q4 hH i i No beep I bre lt Beeps gt lt No beep Beeps gt lt Repe
61. Revision A MXZ 3C24NA MXZ 3C30NA and MXZ 4C36NA have been added Use the specified refrigerant only Never use any refrigerant other than that specified Doing so may cause a burst an explosion or fire when the unit is being used serviced or disposed of Correct refrigerant is specified in the manuals and on the spec labels provided with our products We will not be held responsible for mechanical failure system malfunction unit breakdown or accidents caused by failure to follow the instructions 1 TECHNICAL CHANGES MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ 1 New model MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA 1 New model OBH702A 2 PART NAMES AND FUNCTIONS MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA Back and side Drain outlet MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ Back and side Drain outlet OBH702A Outdoor model 3 SPECIFICATION MXZ 3C24NA Item Indoor type Non Duct 06 09 09 Duct 09 09 09 Cooling Btu h 22 000 23 600 Capacity Heating 47 Btu h 25 000 24 600 Heating 17 Btu h 19 600 19 600 Cooling W 1 620 2 100 P OWEN Heating 47 1 750 1 900 consumption Heating 17 W 2 120 2 230 EER Cooling 13 6 11 2 SEER Cooling 20 0 1
62. T6 3AL 250V LED 1 3 LED RT62 DISCHARGE TEMP X52C RELAY 2194 REVERSING VALVE sch ma lectrique pour F711 FUSE T3 15AL 250V LEV A C EXPANSION VALVE THERMISTOR X65 RELAY SOLENOID COIL duct HPS HIGH PRESSURE SWITCH MC COMPRESSOR RTe4 FIN TEMP THERMISTOR X712 RELAY en cuivre pour le c blage IC411 POWER FACTOR CONTROLLER MF FAN MOTOR RT65 AMBIENT TEMP THERMISTOR X714 RELAY 3 Symbole ci dessous indique tbornier connecteur OBH702A ie MXZ 4C36NA CIRCUIT BREAKER TAB6 Q TABS TAB4Q TABS x POWER SUPPLY X 208 230V CR phase 60Hz 1C501 gt OUTDOOR POWER P C BOARD CN171 o CN151 CN152 CNAC2 Rte 2 2 9 3 ieeoooog l 1 55 2 1 9 9 3 TBE4 TO INDOOR L Xx x x UNIT No C x z 5 a 5
63. a oa cn ea 2 V UYMS VW a 1 6006666 7 1 1f66066640 7 1 2 1 6 o 3 BN TB4 3 CNE1 CNDC CN702 CN701 CNAC ORNA ME X OUTDOOR CONTROL P C BOARD F711 l PES effer A Great TO INDOOR 17801 e Or vow BLK 208 230V UNIT No C LED3 E e o E IC801 NI ORN WHT Ee 1 00000 5 BLK BLU WHT 2 wr CN741 CN795 GN793 CN791 x712 xziaR BLU 10 5 Qileoooo 5 1 6 5 5 RED NA S2 TO INDOOR LEDI UNIT No B y NN BLU Si YLW RED CN601 0 CNTHI CNTH2 CN794 CN792 CN712 CN713 714 CN63H or N 119999000 9 8 10 2 1 oooool5 Q1I1eoooo9 5 1 21 2 O 2 9 2 D rep B2 wa al qd s fs 5 5 5 oTo BLU Shp zm Seer ang Here RT61 RT62 RT65 ir LEVE LEVD LEVC LEVB LEVA QU SYMBOL NAME SYMBOL NAME NOTES CBi 4 SMOOTHING CAPACITOR 11 12 REACTOR 1 About the indoor side electric wiring refer to the indoor unit Di DIODE LED 1 3 LED electric wiring diagram for servicing in FUSE See EE E 2 Use copper conductors only For field wiring Symbols below indi 2 HPS _ HIGH PRESSURE SWITCH MF _ FAN MOTOR y d paral IC401_ DIODE BRIDGE 7801 TRANSFORMER i 16417 POWER MODULE TB1 6 TERMINAL BLOCK pod connector 1 501 POWER MODULE X52CA B RELAY NOTES IU PONR E SEG mm RELAY 1 propos du c blage lectrique de c t int rieur se r f rer l unit int rieure c blage CUIT PRO sch ma l
64. ae oe eed PSIG 180 Outdoor low pressure ol o L i l L LAS Outdoor unit current A 120 0 0 65 70 75 80 85 90 95 100 105 110 115 F 65 70 75 80 85 90 95 100 105 110 115 F Ambient temperature F Ambient temperature F 2 HEAT operation Data is based on the condition of outdoor humidity 75 Set air flow to High speed GInverter output frequency is 20 Hz EE en L O Outdoor unit current A F 3 15 20 25 30 35 40 45 50 55 60 65 70 75 F Ambient temperature F OBH702A 11 18 class unit in single operation OUTDOOR UNIT MXZ 5C42NA MXZ 3C24NAHZ MXZ 3C30NAHZ 1 COOL operation Data is based on the condition of indoor 1 s humidity 5096 How to work fixed frequency operation MT 1 Set emergency switch to COOL or HEAT The switch is located Air flow speed High GInverter output frequency 18 Hz On indoor unt 2 Press emergency run ON OFF button 3 Compressor starts running at 18 Hz COOL or 20 Hz HEAT 4 Indoor fan runs at High speed and continues for 30 minutes 5 To cancel this operation press emergency run ON OFF button or any button on remote controller La Se See eee ee ee s u m ss PSIG Outdoor low pressure Outdoor unit current A 120 0 0 I 65 70 75 80 85 90 95 100105 110 115 F 65 70 75 80 85 90 95 100 105 110 115 F Ambient temperature F Ambient temperature
65. ated cycle Repeated cycle Repeated cycle OBH702A d 3 Outdoor unit failure mode table The left lamp of OPERATION IN DICATOR lamp Indoor unit Abnormal point Failure mode protection LED indication Outdoor P C board LED 1 LED 2 Condition Indoor outdoor unit failure mode recall function OFF None Normal Lighted Lighted 2 time flash Outdoor power system Lighted Lighted Overcurrent protection cut out operates 3 con secutive times within 1 minute after the com pressor gets started or converter protection cut out or bus bar voltage protection cut out operates 3 consecutive times within 3 minutes after start up Check the connection of the com pressor connecting wire Refer to 11 6 How to check inverter compres sor Check the stop valve 3 time flash Discharge temperature thermistor Lighted Once Defrost thermistor Lighted Once Ambient temperature thermistor Lighted Twice Fin temperature thermistor Lighted 3 times P C board temperature thermis tor Lighted 4 times Outdoor heat exchanger tem perature thermistor Lighted 9 times A thermistor shorts or opens during compressor running Refer to 11 6 Check of outdoor thermistors Replace the outdoor control P C board Refer to 11 6 Check of outdoor thermistors Overcurrent Once Not l
66. ci dessous indique RT64 FIN TEMP THERMISTOR 2192 2WAY VALVE SOLENOID COIL bornier RT65 AMBIENT TEMP THERMISTOR 2194 REVERSING VALVE SOLENOID COIL oo 9j connecteur RT68 OUTDOOR HEAT EXCHANGER 26H PROTECTOR EMPERATURE THERMISTOR H DEFROST HEATER 22 OBH702A MXZ 3C24NA MXZ 3C30NA REFRIGERANT SYSTEM DIAGRAM Unit inch mm R V coil OFF Refrigerant flow in heating ON gt Refrigerant flow in cooling floes Sand Accumulator Compressor EE Service port High pressure switch Compressor shell Muffler emperature y hermistor Service port RT62 Union Header Gas 01 2 Stop valve Indoor unit A with service port U 4 way valve gt 03 8 gt Indoor unit B Sub Header Evaporator muffler 3B _ b LL gt Outdoor Indoor unit C heat exchanger Outdoor heat exchanger temperature thermistor Ambient Capillary tube RT68 temperature O D 0 16 x 1 D 0 11 x 3 94 thermistor 04 0 x 22 8 x 100 Capillary tube gt RT65 Union Strainer 01 4 100 LEVA Defrost 7 temperature Indoor unitA lt AM Q3 Strainer thermistor 01 4 Strainer 100 RT61 100 d pk lt gt m Strainer Distributor 50 Indoor unit B D A Q Stop valve y sm Strainer
67. e refer to PARTS CATALOG Unit inch Outdoor unit union diameter For H Liquid 1 4 Indoor unit A Gas 3 8 Liquid 1 4 Indoor unit B Gas 3 8 OBH702A is MXZ 3C24NAHZ MXZ 3C30NAHZ R V coil K Refrigerant flow in heating ON Union 01 2 bue Refrigerant flow in cooling Accumulator Compressor temperature Oil separator thermistor RT62 High pressure switch Compressor shell gt Service port NA Header Gas Service port Indoor unit A 4 way valve Z 7 oX N vA Stop valve Indoor unitB lt 38 3 8 with service port 2 way gt solenoid valve Indoor unitc Capillary tube O D 0 16 x I D 0 11 x 3 94 Capillary tube O D 0 10 x I D 0 02 x 39 37 02 5 x 20 6 x 1000 SEE temperature thermistor Unit inch mm Header Evaporator Outdoor heat exchanger Outdoor heat exchanger Ambient temperature thermistor RT65 RT68 Unio stahet 4 0 x 22 8 x 100 1 4 4100 LEVA IndooruntA lt Defrost Strainer Capillary tube temperature 100 thermistor Strainer q RT61 Strainer 1 4 100 LEVB Distributor Stop valve 50 Indoor unit lt Ay e Strainer m sas sip 50 ii Strainer Ne 1 4 LI 100 Indoor unit
68. eck 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 OPERATIONAL INDICATOR lamp is flashing on and off before starting service work 2 When the outdoor control P C board seems to be defective check the copper foil pattern for disconnection and the components for bursting and discoloration 3 When troubleshooting refer to 11 2 11 3 and 11 4 11 2 FAILURE MODE RECALL FUNCTION This air conditioner can memorize the abnormal condition which has occurred once Even though LED indication listed on the troubleshooting check table 11 4 disappears the memorized failure details can be recalled 1 Flow chart of failure mode recall function for the indoor outdoor unit Refer to the service manual of indoor unit OBH702A 2 Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal Check if outdoor unit is abnormal according to the following procedures Y Make sure that the remote controller is set to the failure mode recall function 3X1 Regardless of normal or abnormal condition 2 short X3 beeps are emitted as the signal is received X3 Refer to the service manual of indoor unit Y With the remote controller headed towards the indoor unit press the TEM PERATURE buttons to adjust the set temperature to 77 F 25 C X1 Does the
69. ectrique pour l entretien RT61 DEFROST THERMISTOR X713 RELAY ar RT62 DISCHARGE TEMP THERMISTOR X714 RELAY 2 Utiliser des conducteurs en cuivre pour le c blage RT64 FIN TEMP THERMISTOR 2152 2WAY VALVE SOLENOID COIL 3 Symbole ci dessous indique RT65 TEMP THERMISTOR 2194 REVERSING VALVE SOLENOID COIL LLLJ bornier RT68 OUTDOOR HEAT EXCHANGER Dogl connecteur TEMPERATURE THERMISTOR OBH702A MXZ 2C20NAHZ IC501 BLU CIRCUIT p IB BREAKER Lir X poner supo 2L ace 1208290 GRN YLW 1 phase 60Hz GRF b BLK U L O O O OUTDOOR POWER P C BOARD CNDC CN151 CN182 TBE1 TBE2 TBE3 TBE4 CNAC2 CN171 C 1 3 1i 9 9 9 9 o o o 7 119 9 2 ji 1 1 9 3 ee MF a a m m m m di BLK RED z xj x Se wi a5 RT64 OV 09 PW 1 7
70. er to 11 6 Check of LEV Not ligh Fin temperature ection The fin temperature exceeds during operation board temperature ection The P C board temperature exceeds during opera tion Check refrigerant circuit and refrigerant amount Refer to 11 6 Check of outdoor fan motor Not ligh h pressure ection High pressure is detected with the high pressure switch HPS during operation The outdoor heat exchanger temperature exceeds 158 F during cooling or the indoor gas pipe tem perature exceeds 158 F during heating Check around of gas and the refrigerant circuit Check the stop valve 6 times Not lighted Pre heating protection Overcurrent is detected during pre heating Reconnect compressor connector Refer to 11 6 How to check inverter compressor Check the power module 8 times Not lighted Converter protection A failure is detected in the operation of the convert er during operation Replace the outdoor power P C board 9 times Not lighted Bus bar voltage protection The bus bar voltage exceeds 400 V or falls to low level during compressor operating Check the voltage of power supply Replace the outdoor power P C board or the out door control P C board Refer to 11 6 Check of bus bar voltage OBH702A 11 times Not lighted Low out side tempera ture protection coolin
71. ets 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 Compressor starts running at 33 Hz COOL or 45 Hz HEAT The frequency at each operation mode is fixed 7 When system stabilizes after more than 15 minutes measure temperature and take an average temperature 8 10 minutes later measure temperature again and check that the temperature does not change INDOOR UNIT OUTDOOR UNIT Wet and dry bulb S Wet and dry bulb thermometers thermometers FRONT VIEW BACK VIEW OBH702A 99 8 2 CAPACITY AND THE INPUT CURVES MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA Cooling capacity at Rated frequency Indoor inta
72. g The ambient became 10 4 F or less Low out side tempera ture protection Heating The ambient became 1 4 F or less MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA MXZ 5C42NA The ambient became 18 F or less MXZ 2C20 NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ 63 Symptom Indication Abnormal point Con LED1 Red LED2 Yellow dition Condition Remedy Outdoor unit stops and restarts 3 minutes later is repeated 13 times Not lighted Outdoor fan motor A failure occurs 3 consecutive times within 30 seconds after the fan gets started Refer to 11 6 Check of outdoor fan motor Lighted 8 times Current sensor protec tion A short or open circuit is detected in the current sensor during compressor operating Replace the outdoor power P C board Lighted 11 times Communication between P C boards protection Communication error occurs between the outdoor control P C board and outdoor power P C board for more than 10 seconds Check the connecting wire between outdoor con trol P C board and outdoor power P C board Lighted 12 times Zero cross detecting circuit protection Zero cross signal cannot be detected while the compressor is operating Check the connecting wire among outdoor control P C board and outdoor power P C board Outdoor unit operates Once Lighted Primary current protec tion The input
73. go 1 411 POWERFACTORCONTROLLER MF FAN MOTOR RT65 AMBIENT TEMP THERMISTOR X714 RELAY PTT bomer i ndque connecteur OBH702A e MXZ 5C42NA WHT RED WHT RED TABS TAB3 TAB6 TAB4 X52CA TAB BLK B BREAKER m KC IC501 IC411 IC401 X52CB L2F X f phase 60Hz TAB2 _ X65A BLK U l PTC2 WHT V PTC3 RED w 1 J J 14 BLK d BLU Bk er Lo OUTDOOR F2 CNAC1 22 POWER PC E dk a BOARD CB1 2 7 CB3 CB4 BS e e BEU sents CNDC CN151 CN152 CNAC2 CN171 BLK proada TO INDOOR ios 199999997 1 o9l2 Ue 9 0609 105 M ICA T bes CNMC Cc x x x x x al al a al a di BLK RED x 2 xxx weir 5 x XIX xx RT64 a o
74. h your hand Disconnect the connectors CN791 LEV A CN792 LEV B CN793 LEV C PNE ET LEV D 2 4 5 Replace the outdoor control P C board Is there normal resistance to LEV coil Refer to 11 5 V No Replace LEV coil OBH702A ee eee When heating room does not get warm When cooling room does not get cool How to check inverter compressor Disconnect the terminal of the compressor or the connector CNMC between the compressor and the outdoor power P C board 3 minutes after the power supply is turned ON start EMERGENCY OPERATION X1 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 X2 The output differs depending on the capacity or the No number of indoor units to be operated Measure the voltage between each lead wire leading to the compressor U BLK V WHT V WHT W RED W RED U BLK Output voltage 50V 250V Is proper output voltage detected x1 x2 Yes Is output balanced No Is the input voltage to the outdoor control P C board 370 V or more Replace the outdoor power P C board Turn OFF the power supply of indoor and outdoor unit and measure the compressor winding resistance between the compressor No terminals Is the resista
75. ighted 21 A MXZ 3C24 3C30 4C36NA 28 MXZ 5C42NA 2C20 3C24 3C30NAHZ current flows into power module Reconnect compressor connector Refer to 11 6 How to check in verter compressor Check the stop valve 5 time flash Discharge temperature Lighted Lighted The discharge temperature exceeds 240 8 F during operation Compressor can restart if discharge tempera ture thermistor reads 212 F or less 3 minutes later Check refrigerant circuit and refrig erant amount Refer to 11 6 Check of LEV High pressure Lighted Lighted The outdoor heat exchanger temperature ex ceeds 158 F during cooling or the indoor gas pipe temperature exceeds 158 F during heating Check refrigerant circuit and refrig erant amount Check the stop valve 7 time flash Fin temperature 3 times Not lighted The fin temperature exceeds 192 F during operation P C board temperature 4 times Not lighted The P C board temperature exceeds 189 F during operation Check around outdoor unit Check outdoor unit air passage Refer to 11 6 Check of outdoor fan motor Outdoor fan motor Lighted Lighted A failure occurs 3 consecutive times within 30 seconds after the fan gets started Refer to 11 6 Check of outdoor fan motor Outdoor control system Lighted 5 times Nonvolatile memory data cannot be read prop erly Replace
76. ing abnormal communication or not connected Pattern 1 and 2 is repeatedly displayed alternately Each pattern is displayed for 15 seconds NOTE Lighting in the table below does not indicate abnormal communication Turn ON the power supply Y Is there rated voltage between No outdoor terminal block S1 and Check the S2 Yes Y Press EMERGENCY OPERATION switch once Outdoor control P C board LED1 LED2 LED3 k Does the left lamp of OPERATION INDICATOR lamp light up Blinking Confirmation of the power to the indoor unit No Pattern LED 1 LED2 LED 3 Yes m Unit A Unit B Lighted Y Is there any miswiring 1 status Status ighte No poor contact or wire 2 Unit C UnitD Not lighted Is serial signal error indicated 6 minutes later gt gt _ disconnection of the Status status indoor outdoor 3 UntE linking Yes connecting wire No Y Turn OFF the power supply Check once more if the indoor outdoor B connecting wire is not miswiring Bridge the
77. ion OUTDOOR UNIT MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA 1 COOL operation Data is based on the condition of indoor a Ene eg Sore Soy ee wee ew s T humidity 50 lt How to work fixed frequency operation gt GAir flow speed High GInverter output frequency 24 Hz 1 Set emergency switch to COOL or HEAT The switch is located on indoor unit 2 Press emergency run ON OFF button 3 Compressor starts running at 24 Hz COOL or 32 Hz HEAT 4 Indoor fan runs at High speed and continues for 30 minutes 5 To cancel this operation press emergency run ON OFF button or any button on remote controller EM ay a IDEM T LT men PSIG Outdoor low pressure Outdoor unit current A wo o 110 65 70 75 80 85 90 95 100 105 110 115 F F 9s 70 75 80 85 90 95 100 105 110 115 Ambient temperature F Ambient temperature F 2 HEAT operation Data is based on the condition of outdoor humidity 75 Set air flow to High speed lnverter output frequency is 32 Hz Outdoor unit current 5 20 25 30 35 40 45 50 55 60 65 70 75 Ambient temperature F OBH702A 1 ee 4 15 class unit in single operation OUTDOOR UNIT MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA 1 COOL operation Data is based on the condition of indoor humidity 50 GAir flow speed High GInverter output frequency 24 Hz How to work fixed frequency operation 1 Set emergency switch to COOL or HE
78. ke air Wet bulb s temperature F ac E 55 28 3 8 79 7 as S 9 72 68 o 64 ss 23 32 41 50 59 68 77 86 95 104 113 2s Outdoor intake air Dry bulb temperature F 5 0 2 353 228 13 Total input Cooling at Rated frequency a o 14 64 10 2 5 0 9 0 8 Indoor intake air Wet bulb temperature F 14 23 32 41 50 59 68 77 86 95 104 113 Outdoor intake air Dry bulb temperature F Heating capacity at Rated frequency g 24 3 7 34 0 4487 491 5337 398 13 Ra H 22 5 313 414 1 45 4 491 367 12 e 79 HE 20 5 28 8 380 41 6 452 337 14 nA 39 155 257 3401374 4051 302 219 Be 166 232 306 337 365 272 Sos oa cane EB 148 207 2721299 324 4 241 Log Leet at ge 130 1180 411265 20 214 807 noe Lk S 110 1153 2021221 241 180 Soe 2 M MNT H 9 2 13 0 17 1 18 7 20 5 15 1 Sos d 74 10 3 13 5 1 148 16 0 11 9 0 4 eb amp 2 9 eo le a 5 14 23 32 41 50 59 E oF s s S 8 N Outdoor intake air Wet bulb temperature F 25 os o log o5 ea Total input Heating at Rated frequency 8 9 z Q 1 3 ZER 1 2 79 g 68 8 59 c 1 0 out xem 2 ax 1 2 09 F o Ado PB z E 0 8 F 2 207 2 0 6 0 5 0 4 MXZ 3C30 4C36NA 5 14 23 32 41 50 59 OBH702A Outdoor intake air Wet bulb temperature F NOTE The above broken lines are for the heating operation without any frost and defrost operation 40 1 MXZ 5C42NA MXZ 2
79. lever or not 2 The terminal with this connector has the locking mechanism Slide the sleeve Hold the sleeve and Pull the terminal while pull out the terminal pushing the locking slowly lever Connector 12 1 MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA Photos MXZ 4C36NA NOTE Turn OFF the power supply before disassembly OPERATING PROCEDURE PHOTOS 1 Removing the panels Photo screws of the top panel 1 Remove the screws fixing the top panel and remove the top panel 2 Remove the screws fixing the service panel 3 Pull down the service panel and remove the service panel 4 Disconnect the power supply and indoor outdoor connect ing wire 5 Remove the screws fixing the front panel and remove the front panel 6 Remove the screws fixing the back panel and remove the back panel Photo 3 Catch of the front panel Catch of the front panel Screws of the front panel Screws of the service panel Photo 2 Screws of the top panel Screws of the front panel 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 4 Screws of the back panel OBH702A a OPERATING PROCEDURE PHOTOS 2 Removing the outdoor control P C board the reac Photo 4 tor and the outdoor power P C board 1 Remove the top panel and the service panel Refer to 1 2 Disconnect the power supply and indoor outdoor connect ing wire 3 Disconnect the connectors on the outdoor control P C board 4 Remove the screws fixing the o
80. mpressor speed 80 67 82 65 B 1 Cooling steady state at minimum compressor speed 80 67 82 65 Low ambient cooling steady state at minimum compressor speed 80 67 67 53 5 Intermediate cooling steady state at intermediate compressor speed 80 67 87 69 Heating 1 Standard rating heating at rated compressor speed 70 60 47 43 2 Low temperature heating at maximum compressor speed 70 60 17 15 Maximum temperature heating at minimum compressor speed 70 60 62 56 5 High temperature heating at minimum compressor speed 70 60 47 43 Frost accumulation at rated compressor speed 70 60 35 33 Frost accumulation at intermediate compressor speed 70 60 35 33 Mode Test OBH702A 2 Outdoor model MXZ 3C24NAHZ Indoor type Non Duct 06 06 09 Duct 09 09 09 Cooling Btu h 22 000 23 600 Capacity Heating 47 Btu h 25 000 24 600 Heating 17 Btu h 14 000 14 000 Cooling WwW 1 630 2 360 Heating 47 1 725 1 871 Heating 17 1 622 1 635 Cooling 13 5 10 0 SEER Cooling 19 0 15 5 HSPF IV V Heating 10 0 9 0 COP Heating 4 25 3 80 External finish Munsell 3 0Y 7 8 1 1 Power supply V phase Hz 208 230 1 60 Max fuse size time delay A 40 Min circuit ampacity A 29 9 Fan motor 1 9 Model MNB33FBTMC L Winding resistance T at 68 F U V 0 30 V W 0 30 W U 0 30 20 28 8 Refrigerant control LEV Sound level 54 58 Defrost method Reverse cycle 37 13 32 Dimensions in 1
81. nce between each terminal normal Refer to 11 5 yes Reconnect the lead wire of compressor and turn ON the power supply to indoor and outdoor unit 3 minutes later start EMERGENCY OPERATION Clarify the causes by counting time until the inverter stops 0 to 10 seconds compressor layer short 10 to 60 seconds compressor lock 60 seconds to 5minutes refrigerant circuit defective 5 minutes or more normal OBH702A i 9 When thermistor is abnormal Check of outdoor thermistors Disconnect the connector in the following table and Abnormal Replace the thermistor except RT64 measure the resistance of the thermistor to check In case that RT64 is abnormal replace the whether the thermistor is normal or not Refer to 11 7 outdoor power P C board since RT64 is combined with the outdoor power board orma Reconnect the connector in the following table and disconnect the lead wire leading to the compressor 3 minutes after turning ON the power supply start EMERGENCY OPERATION Does the unit operate 10 minutes or more without No Replace the outdoor control P C board or the showing thermistor abnormality outdoor power P C board Yves Thermistor Symbol Connector Pin No Board Defrost RT61 Between CNTH1 pin1 and pin2 Discharge temperature RT62 Between CNTH1 pin3 and pin4 Outdoor control P C board Outdoor heat exchange
82. o Check of When heating non Check of How to check How to check check R V coil operating indoor unit miss piping inverter compressor inverter miswiring and gets warm Check mis piping compressor serial signal Refer to 11 6 shortage of capacity error Check of LEV 62 11 4 TROUBLESHOOTING CHECK TABLE Indication Symptom LED1 Red LED2 Yellow Abnormal point Con dition Condition Remedy Outdoor unit does Lighted Once LEV and drain pump The indoor unit detects an abnormality in the LEV and drain pump Refer to 11 6 Check of LEV Check the drain pump of the indoor unit not operate Ligh Outdoor power system Overcurrent protection cut out operates 3 consecu tive times within 1 minute after the compressor gets started or converter protection cut out or bus bar voltage protection cut out operates 3 consecu tive times within 3 minutes after start up Check the connection of the compressor connect ing wire Refer to 11 6 How to check inverter compres Sor Check the stop valve 3 times Discharge temperature hermistor A short circuit is detected in the thermistor during operation or an open circuit is detected in the thermistor after 10 minutes of compressor start up Refer to 11 6 Check of outdoor thermistors 4 times Fin temperature hermistor P C board tempera ure thermistor A short
83. o 4 8 Remove the propeller fan 9 Remove the screws fixing the VB fixture and remove the VB fixture 10 Remove the screws fixing the separator and remove the separator NOTE When installing the separator insert the tabs of the heat exchanger into the separator 11 Remove the sound proof felt 12 Detach the brazed parts of the suction and discharge pipes Photo 11 13 Remove the nuts of the compressor and remove the compressor Photo 11 14 Detach the brazed parts of 4 way valve and pipes OBH702A id Photo 9 Screw of the VB fixture TU Screws of the outdoor fan motor il Sound i proof felt Screws of the outdoor fan motor VB fixture Separator Photo 10 4 way valve Brazed parts OPERATING PROCEDURE PHOTOS 5 Removing the expansion valve Photo 11 1 Remove the top panel and the service panel Refer to 1 2 Disconnect the power supply and indoor outdoor connect ing wire Gas recovery is not required if the unit is pumped down N irn Z hi Discharge pipe Suction pipe brazed part brazed part 3 Remove the LEV coils aJ 4 Detach the brazed parts of expansion valves and pipes A llu H FD 1 v 1 Expansion Compressor nuts LEV coils valves I MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2014 MITSU
84. ol P C board connectors CNF1 CNTH1 CNTH2 CN63H CN712 CN791 CN792 CN793 CN794 MXZ 4C 6 Remove the screws fixing the electrical parts and remove the electrical parts Photo 4 7 Remove the propeller fan N 8 Remove the screws fixing the separator and remove the Brazed parts separator 9 Remove the sound proof felt 10 Detach the brazed parts of the compressor suction and discharge pipes Photo 9 11 Remove the compressor nuts and remove the compressor Photo 9 12 Detach the brazed parts of 4 way valve and pipes OBH702A i OPERATING PROCEDURE PHOTOS 5 Removing the expansion valve 1 Remove the top panel and the service panel Refer to 1 2 Disconnect the power supply and indoor outdoor connect ing wire Gas recovery is not required if the unit is pumped down 3 Remove the LEV coils 4 Detach the brazed parts of the expansion valves and pipes OBH702A 80 Photo 9 Discharge pipe brazed part Expansion 5 Expansion valves LEV coils 12 2 MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ Photos MXZ 3C30NAHZ NOTE Turn OFF the power supply before disassembly OPERATING PROCEDURE PHOTOS 1 Removing the panels Photo 1 1 Remove the screws fixing the top panel and remove the Screws of the top panel top panel 2 Remove the screws fixing the service panel 3 Pull down the service panel and remove
85. ondition of outdoor humidity 75 Set air flow to High speed GInverter output frequency is 32 Hz 7 0 e o gt Outdoor unit current A 2 0 15 20 25 30 35 40 45 50 55 60 65 70 75 F Ambient temperature F OBH702A M E 2 09 class unit in single operation OUTDOOR UNIT MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA 1 COOL operation Data is based on the condition of indoor mid pe ae GAS eS ae ee eg humidity 50 How to work fixed frequency operation i TN 11 Set emergency switch to COOL or HEAT The switch is located Air flow speed High t tout fi OAH on indoor unit Oral S HTC 12 Press emergency run ON OFF button 3 Compressor starts running at 24 Hz COOL or 32 Hz HEAT i4 Indoor fan runs at High speed and continues for 30 minutes 5 To cancel this operation press emergency run ON OFF button or any button on remote controller DC GC I MI Lcx PR Outdoor low pressure Outdoor unit current A 0 Gs 70 75 80 85 90 95 100 105 110 115 F 2 HEAT operation Ambient temperature Ambient temperature F Data is based on the condition of outdoor humidity 75 Set air flow to High speed GInverter output frequency is 32 Hz Outdoor unit current A 2 0 15 20 25 30 35 40 45 50 55 60 65 70 75 F Ambient temperature F OBH702A gt O 3 12 class unit in single operat
86. outdoor terminal block S2 and Miswiring may damage indoor electronic control S3 P C board during the operation x1 Be sure to confirm the wiring is correct before the operation starts Y Turn ON the power supply 2 00 eee and 0 8 second ON quick blinking Lighted or Yes not lighted 2 Be careful of the residual 1 voltage of smoothing capacitor Turn OFF the power supply Remove the bridge between outdoor terminal block S2 and S3 Turn ON the power supply Is there amplitude of 10 to 20 VDC between outdoor terminal block S2 No A and S3 Confirmation of serial g ahh signal urn OFF inverter controlled lighting equipment Turn OFF the power supply and then Yes turn ON again Press EMERGENCY OPERATION Y Is there any error of the Switch Is there rated voltage between indoor outdoor connecting wire Yes Replace the Reinstall indoor terminal block S1 and S2 Such as the damage of the wire indoor outdoor either the Confirmation of power voltage intermediate connection poor connecting wire unit or the No contact to the terminal block Is serial signal ton ach vM error indicated other No 6 minutes later Attach a filter on remote receiving Yes section of Be sure to release the failure mode Y the indoor recall function after checking B unit TTIR 2 _ _ _ Refer to indoor unit service manual n OBH702A id Pe The cooling operation or heating operation does not operate
87. r temperature Between CNTH1 pin7 and pin8 Ambient temperature Between CNTH2 pin1 and pin2 Fin temperature Between CN171 pin1 and pin2 Outdoor power P C board OBH702A a pl Fan motor does not operate or stops operating shortly after starting the operation Check of outdoor fan motor Disconnect CNF1 and measure the resistance of the outdoor fan motor CNF1 Outdoor control P C board Is the resistance of outdoor fan motor No Measuring points Resistance normal Refer to right table Replace the outdoor fan motor 9 pin 1 pin 4 Yes No pin 5 pin 4 60 kO Does the outdoor fan motor rotate smoothly Replace the outdoor fan motor pin 6 pin 4 160 kO Yes pin7 pin4 in 7 pin 4 1 Voltage P P Turn on the power supply to start operation To measure the resistance connect and measure the voltage of connector CNF1 pin 1 pin 4 294 825 VDC the negative end of the tester to pin 4 pin 5 pin 4 15 VDC pin 6 pin 4 1 5 To measure the voltage connect the negative end of the tester to pin 4 Voltage between pin 4 and 6 should be measured within 1 minute after the operation starts Is the voltage of connector CNF1 normal Refer to right table Replace the outdoor control P C board Yes Turn OFF the power supply and connect the connector CNF1 T
88. r type Non Duct 09 09 Duct 09 12 Cooling Btu h 18 000 20 000 Capacity Heating 47 Btu h 22 000 22 000 Heating 17 Btu h 13 700 13 700 Cooling W 1 334 1 819 Heating 47 1 612 1 748 Heating 17 1 450 1 588 Cooling 13 5 11 0 SEER Cooling 17 0 15 0 HSPF IV V Heating 9 8 9 5 COP Heating 4 00 3 69 External finish Munsell 3 0Y 7 8 1 1 Power supply V phase Hz 208 230 1 60 Max fuse size time delay A 40 Min circuit ampacity A 28 9 Fan motor 1 9 Model MNB33FBTMC L Winding resistance s Compressor at 68 F U V 0 30 V W 0 30 W U 0 30 20 28 8 Refrigerant control LEV Sound level 54 58 Defrost method Reverse cycle 37 13 32 Dimensions in 13 41 17 64 Weight I 187 Item Power consumption Remote controller Wireless type Control voltage by built in transformer 4 Refrigerant piping Not supplied optional parts Liquid 1 4 Valve size Gas A B 3 8 Indoor Flared Connection method Outdoor Flared Refrigerant charge R410A 8 Ib 13 oz Refrigeration oil Model NOTE Test conditions are based on ARI 210 240 37 4 FV50S Unit F Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling 1 A Cooling steady state at rated compressor speed 80 67 95 75 B 2 Cooling steady state at rated co
89. ration 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 198 253 V 60 Hz 2 AIR FLOW Air flow should be set at MAX 3 MAIN READINGS 1 Indoor intake air wet bulb temperature FWB 2 Indoor outlet air wet bulb temperature FWB Cooling 3 Outdoor intake air dry bulb temperature FDB 4 Total input W 5 Indoor intake air dry bulb temperature FDB 6 Outdoor intake air wet bulb temperature FWB Heating 7 Total input W Indoor air wet and dry bulb temperature difference on the left side of the following chart shows the difference between the indoor intake air wet and dry bulb temperature and the indoor outlet air wet and dry bulb temperature for your reference at service How to measure the indoor air wet and 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 s
90. remove the reactors Photo 7 Screws of the control box F Photo 8 gt Screws of 7 the reactor 4 OBH702A Screw of the electrical parts Photo 4 Screws of the electrical parts Photo 5 Screws of the outdoor control P C board Photo 6 Screws of the TB support Screws of the outdoor power P C board Screws of the control box separator OPERATING PROCEDURE PHOTOS 3 Removing the fan motor 1 Remove the top panel the service panel and the front panel Refer to 1 2 Disconnect the power supply and indoor outdoor connect ing wire 3 Disconnect the connector CNF1 on the outdoor control P C board 4 Remove the propeller fan 5 Remove the fan motor 4 Removing the compressor and 4 way valve 1 Remove the top panel the service panel and the front panel 2 Disconnect the power supply and indoor outdoor connect ing wire and remove the back panel 3 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm 0 MPa 5 Disconnect the compressor lead wire from the terminal of the compressor U V W 6 Disconnect the outdoor control P C board connectors CNF1 CNTH1 CNTH2 CN63H CN712 CN713 CN714 MXZ C NAHZ CN791 CN792 CN793 MXZ 5C42NA MXZ 3C24 30NAHZ CN794 MXZ 5C42NA CN795 MXZ 5C42NA 7 Remove the screws fixing the electrical parts and remove the electrical parts Phot
91. ressor RED V U WHT BLK Measure the resistance between terminals using a tester Winding temperature 14 F 104 F Normal Each phase MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA 0 83 Q 1 03 Q Measure the resistance between terminals using a tester Winding temperature 14 F 104 F Normal Each phase MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ 0 77 Q 0 95 Q Outdoor fan motor Refer to 11 6 R V coil Measure the resistance using a tester Part temperature 14 F 104 F Normal Each phase MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA 1 20 kQ 1 77 kO Measure the resistance using a tester Part temperature 14 F 104 F Normal Each phase MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ 1 24 1 86 2 way valve solenoid coil MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ Measure the resistance using a tester Part temperature 14 F 104 F Normal MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ 0 97 1 37 Linear expansion valve Measure the resistance using a tester Part temperature 14 F 104 F WEEE Color of lead wire Normal RED WHT RED ORN son 3740 5190 YLW BLU RED BLU High pressure switch s Normal HPS HPS 537 22 PSIG Close 696 5 PSIG Defrost heater MXZ 2C
92. rn ON the power supply and wait at least 1 minute 5 Press the piping wiring correction switch SW871 on the outdoor control P C board Do not touch energized parts LED indication during detection LED1 Red LED2 Yellow LED3 Green Lighted Lighted Once LED indication after detection LED1 Red LED2 Yellow LED3 Green Indication Lighted Not lighted Lighted Completed Problem corrected nomal Once Once Once Not completed Detection failed Refer to SAFETY PRECAUTIONS WHEN LED FLASHES located behind the service panel Make sure that the valves are open and the pipes are not collapsed or clogged 6 Press the switch to cancel LED indication after cancel LED1 Red LED2 Yellow LED3 Green Lighted Lighted Not lighted Other indications NOTE Indoor unit cannot be operated while this function is activated When this function is activated while indoor unit is operating the operation will be stopped Operate indoor unit after the auto line correcting is finished Pressing the switch during detection cancels this function The record of auto line correcting can be confirmed in the following way Press the switch for more than 5 seconds LED will show the record of auto correcting for about 30 seconds as shown in the table below Number of blinks LED1 Red LED2 Yellow LED3 Green Wiring line Once Once Lighted Not corrected 3 times 3 times Lighted Corrected
93. state at intermediate compressor speed 80 67 87 69 Heating 1 Standard rating heating at rated compressor speed 70 60 47 43 2 Low temperature heating at maximum compressor speed 70 60 17 15 Maximum temperature heating at minimum compressor speed 70 60 62 56 5 High temperature heating at minimum compressor speed 70 60 47 43 Frost accumulation at rated compressor speed 70 60 35 33 OBH702A Frost accumulation at intermediate compressor speed 70 60 35 33 Outdoor model MXZ 3C30NA Item Indoor type Non Duct 09 09 12 Duct 09 09 12 Cooling Btu h 28 400 27 400 Capacity Heating 47 Btu h 28 600 27 600 Heating 17 Btu h 21 000 21 000 Cooling 2 680 2 860 Power Heating 47 2 150 2 220 consumption Heating 17 2 120 2 140 EER Cooling 10 6 9 6 SEER Cooling 19 0 16 2 HSPF IV V Heating 10 6 10 6 COP Heating 3 90 3 64 External finish Munsell 3 0Y 7 8 1 1 Power supply V phase Hz 208 230 1 60 Max fuse size time delay 25 Min circuit ampacity 22 1 Fan motor 1 9 Model SNB220FQGMC Winding resistance Compressor at 68 F U V 0 95 V W 0 95 W U 0 95 12 13 7 Refrigerant control LEV Sound level 52 56 Defrost method Reverse cycle 37 13 32 Dimensions 13 31 11 32
94. tal bending point 80 MAX Max height difference Outdoor 49 ft 49 ft Refrigerant pipe diameter is different according to indoor unit to 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 refer to PARTS CATALOG OBH702A Unit inch Outdoor unit union diameter For Liquid 1 4 Indoor unit A Gas 1 2 Liquid 1 4 Indoor unit B Gas 3 8 Liquid 1 4 Indoor unit C Gas 3 8 Liquid 1 4 Indoor unit D Gas 3 8 Liquid 1 4 Indoor unit E Gas 3 8 28 MXZ 2C20NAHZ Unit inch mm R V coil OFF 5 Refrigerant flow in heating ON gt Refrigerant flow in cooling lt t Sar ascas Accumulator Compressor CO Compressor shell sx gt Service port emperature Oil separator hermistor RT62 High pressure switch VY Union Header Gas Service port 03 8 Indoor unit a 4 way valve Z Z X lt a pt Stop valve Header Evaporator with service port Capillary tube uideor 3I gt Bway O D 0 10 x D 0 02 x 39 37 aa solenoid val
95. te controller eS nove nec EAR e ALL cA lUe ei Ae M h e cy o lege All now Dei a mtl co wo ee S A B 80 e LE TT m LEAL T 0 LHH E 12 65 70 75 80 85 90 95 100 105 110 115 F Outdoor low pressure m Outdoor unit current 5 70 75 80 85 90 95 100105 110 115 Ambient temperature F Ambient temperature F 2 HEAT operation Data is based on the condition of outdoor humidity 75 Set air flow to High speed GInverter output frequency is 32 Hz Outdoor unit current 2 0 15 20 25 30 35 40 45 50 55 60 65 70 75 Ambient temperature F OBH702A x ia P ee 6 24 class unit in single operation OUTDOOR UNIT MXZ 3C30NA MXZ 4C36NA 1 COOL operation Data is based on the condition of indoor lix vaca oo pan ate oe Sok Bee S ee ee humidity 50 lt How to work fixed frequency operation gt np i1 Set emergency switch to COOL or HEAT The switch is located GAir flow speed High E en ihdosrunit l hverter gutput feguency 24 hz 2 Press emergency run ON OFF button 3 Compressor starts running at 24 Hz COOL or 32 Hz HEAT i4 Indoor fan runs at High speed and continues for 30 minutes 15 To cancel this operation press emergency ON OFF button or any button on remote controller Outdoor low pressure 130 MARE 65 70 75 80 85 90 95 100 105 110 115 F 65 70 75 80 85 90 95 100 105 110 115 F Ambient temperature F
96. ter P C board and outdoor control P C board or terminal bed 12 times Zero cross detecting circuit The protection cut out of the zero cross detecting circuit operates 10 consecutive times Check the connecting wire among outdoor control P C board and outdoor power P C board 13 times Current sensor A short or open circuit is detected in the input cur rent detection circuit during operation Replace the outdoor power P C board 14 times Voltage sensor A short or open circuit is detected in the input volt age detection circuit during operation Replace the outdoor power P C board 15 times Relay operation No relay operation is detected during operation Replace the outdoor power P C board Outdoor unit stops and restarts 3 minutes later is Not ligh IPM protection Overcurrent is detected after 30 seconds of com pressor start up Lock protection Overcurrent is detected within 30 seconds of com pressor start up Reconnect compressor connector Refer to 11 6 How to check inverter compressor Check the stop valve Check the power module PAM module repeated Not ligh Discharge temperature protection The discharge temperature exceeds 240 8 F dur ing operation Compressor can restart if discharge temperature thermistor reads 212 F or less 3 minutes later Check the amount of gas and refrigerant circuit Ref
97. the service panel 4 Disconnect the power supply and indoor outdoor connect ing wire 5 Remove the screws fixing the front panel and remove the front panel 6 Remove the screws fixing the back panel and remove the back panel Screws of the front panel Screws of the service panel Photo 2 Screws of the top panel Screw of the back panel Screws of the front panel Screws of the back panel OBH702A d OPERATING PROCEDURE PHOTOS 2 Removing the outdoor control P C board the reac tor and the outdoor power P C board 1 Remove the top panel the service panel and the front panel Refer to 1 2 Disconnect the power supply and indoor outdoor connect ing wire 3 Disconnect the connectors on the outdoor control P C board 4 Remove the screws fixing the outdoor control P C board and remove the outdoor control P C board 5 Remove the screws fixing the electrical parts and remove the electrical parts 6 Remove the screws fixing the TB support and remove the TB support 7 Remove the screws fixing the control box separator and remove the control box separator 8 Disconnect the lead wire of the outdoor power P C board 9 Remove the screws fixing the outdoor power P C board and remove the outdoor power P C board with the out door P C board holder 10 Remove the screws fixing the control box F and remove the control box F 11 Remove the screws fixing the reactors and
98. unched hole Unit inch mm 6 7 8 23 5 8 26 718 Rear Air V intake 2 13 16 9327 32 4 19 32 2 1 32 2 U Shaped Notched Hole FERE 3 13 16 gt Foundation Bolt M10 13 32 N s m S 3 1 8 s N IO oU Side Air Intake c gt Sha amp 4 P x m N 2 3S b amp ee a u 6 91 5 16 Drain Hole t 13 32 N 13 32 RA m Air gt Discharge NA 2 15 32 X1 13 32 Oval Hole Foundation Bolt M10 Handle 2 15 16 Connecting wire hole 2 3 32 1 5 32 3 97 8 punched hole 71 Connecting wire hole e n O e m hl e 9 W a d 6 9 z J mom y 2g IS e Ern T 9 oe a N 4 e 9 n 1 5 16 m m a n OBH702A 1FREE SPACE 2 5 E 5 3 15 16 _or more ME N e X 4 jl 3 15 16 or 13 25 32 or more o 2 SERVICE SPACE 5 o 2 5 5 o sx a 3 15 16 or more SERVICE SPACE 13 25 32 or more 13 25 32 or more 22 11 64 14 7 32 1 19 11 46 _or more T 37 13 32 31 32 13 19 32 Handle Air intake 2 3 4 m LIQ EQ unit E M LIQ Gaye 99 Es Juni EQ Juni B LIQ
99. urn ON the power supply and measure the voltage of connector CNF1 while rotating the motor by the hand Does the voltage between pin 7 and pin 4X No of connector CNF1 repeat OV and 5V Replace the outdoor fan motor Yes Start operation Does the fan motor operate for about 5 seconds Yes Replace the outdoor control P C board Replace the outdoor fan motor OBH702A m TE When the operation frequency does not go up from the lowest frequency Check of HPS Outdoor control P C board 1 Disconnect the connector CN63H in the outdoor control P C board 2 Check the resistance of HPS after 1 minute has passed since the outdoor unit power supply was turned OFF Infinity lt Check the resistance between each terminal gt gt Replace HPS Reconnect CN63H Turn ON the power supply to the indoor and outdoor unit 3 minutes later start EMERGENCY OPERATION Is HPS protection displayed immediately Yes the outdoor control P C board after compressor starts The other cases Indoor unit does not operate different operating models in multi system When you try to run two indoor units simultaneously one for cooling and the other for heating the unit which transmits signal to the outdoor units first decides the operation mode When the above situation occurs
100. ut 1 34 1 62 1 82 1 75 Electrical circuit Power supply V phase Hz 208 230 1 60 Input 1 296 1 574 1 670 1 660 Comp current 208 230V 6 23 5 63 7 57 6 84 8 03 7 26 7 98 7 22 Fan motor current 0 43 0 39 0 43 0 39 0 43 0 39 0 43 0 39 Refrigerant circuit Condensing pressure 406 341 406 334 Suction pressure 154 110 133 113 Discharge temperature 158 131 148 141 Condensing temperature 108 105 112 103 Suction temperature 60 37 46 37 Comp shell bottom temp 137 107 127 117 Ref pipe length Total pipe length for multi system 25 50 Refrigerant charge R410A 8 Ib 13 oz DB 95 Intake air temperature i p u WB Fan speed Airflow OBH702A 36 Model MXZ 3C24NAHZ Indoor type Non Duct 06 06 09 Duct 09 09 09 Item Cooling Heating Cooling Heating Total Capacity 22 000 25 000 23 600 24 600 SHF Input 1 63 1 73 2 36 1 88 Electrical circuit Power supply V phase Hz 208 230 1 60 Input 1 564 1 661 2 180 1 760 Comp current 208 230V 7 52 6 8 7 99 7 22 10 48 9 48 8 46 7 65 Fan motor current 0 43 0 39 0 43 0 39 0 43 0 39 0 43 0 39 Refrigerant circuit
101. utdoor control P C board holder and remove the outdoor control P C board 5 Disconnect the lead wire from the reactor 6 Remove the screws fixing the reactor and remove the reactor 7 Disconnect the lead wire of the power P C board 8 Disconnect the catches of the PB cover and remove the PB cover 9 Remove the outdoor power P C board Catches of the PB cover Photo 6 Screws of the electrical parts Photo 5 Screws of the reactor Screws of the outdoor control P C board holder OBH702A i OPERATING PROCEDURE PHOTOS 3 Removing the fan motor Photo 7 1 Remove the top panel the service panel and the front panel Refer to 1 Propeller fan 2 Disconnect the power supply and indoor outdoor connect ing wire 3 Disconnect the connector CNF1 on the outdoor control P C board 4 Remove the propeller fan 5 Remove the fan motor Screws of the outdoor fan motor Photo 8 Removing the compressor and 4 way valve 4 way valve 1 Remove the top panel the service panel and the front panel Refer to 1 2 Disconnect the power supply and indoor outdoor connect b ing wire and remove the back panel R V coil 3 Recover gas from the refrigerant circuit 1 j P NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm 0 MPa 4 Disconnect the compressor lead wire from the terminal of the compressor U V W 5 Disconnect the outdoor contr
102. utput frequency is 20 Hz Outdoor unit current A 5 20 25 30 35 40 45 50 55 60 65 70 75 F Ambient temperature F OBH702A Pe 9 ACTUATOR CONTROL MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ Relation between main sensor and actuator Actuator 2 way solenoid Defrost valve heater Sensor Purpose 3i Compressor Outdoor 4 way valve MXZ 5C42VA fan motor MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ Discharge temperature thermistor Protection S Cooling Coil frost Indoor coil temperature prevention thermistor Heating High pres O sure protection Defrost thermistor Heating Defrosting Fin temperature thermistor Protection Control Protection Ambient temperature thermistor Heating Defrosting Heater Outdoor heat exchanger Cooling Control temperature thermistor Protection Capacity code Control OBH702A i 10 SERVICE FUNCTIONS MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA MXZ 5C42NA MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ 10 1 PRE HEAT CONTROL If moisture gets into the refrigerant cycle or when refrigerant is liquefied and collected in the compressor it may interfere the start up of the compressor To improve start up condition the compressor is energized even while it is not operating This is to generate heat at the
103. ve A E nahi re 02 5 x 20 6 x 1000 Outdoor Ambient Indoor unit B heat exchanger emperature temperature i hermistor thermistor Capillary tube 1 RT68 RT65 O D 0 16 x I D 0 11 x 3 94 E 7779 04 0 x 02 8 100 Defrost 1 4 100 LEV A emperature Indoor unit A lt 1 MN Strainer Capillary tube hermistor 100 RT61 pa Distributor 5 Strainer Stop valve ana 50 50 Strainer 1 4 100 LEV B Indoor unit B D AW e OBH702A ce pe Operating Range MXZ 2C20NAHZ Indoor intake air temperature Outdoor intake air temperature Coolin Maximum 95 FDB 71 FWB 115 FDB 9 Minimum 67 FDB 57 FWB 14 FDB Maximum 80 FDB 67 FWB 75 FDB 65 FWB Minimum 70 FDB 60 FWB 12 FDB 13 FWB Heating MAX REFRIGERANT PIPING LENGTH amp PIPE SIZE SELECTION MXZ 2C20NAHZ Piping length each indoor unit a b 82 ft MAX Total piping length a b 164 ft MAX Bending point for each unit 25 MAX Total bending point 50 MAX is irrelevant which unit is higher Max height difference 1 1 49 ft 49 ft Refrigerant pipe diameter is different according to indoor unit to be connected When using extension pipes refer to the tables below When the diameter of refrigerant pipe is different from that of outdoor unit union use optional Different diameter pipe For further information on Different diameter pip
104. w so that no refriger ant is released into the atmosphere 1 Turn off the breaker 2 Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit 3 Fully close the stop valve on the liquid pipe side of the outdoor unit 4 Turn on the breaker 5 Start the emergency COOL operation on all the indoor units 6 When the pressure gauge shows 0 1 to 0 psi Gauge 0 05 to 0 MPa fully close the stop valve on the gas pipe side of the outdoor unit and stop the operation Refer to the indoor unit installation manual about the method for stopping the operation If too much refrigerant has been added to the air conditioner system the pressure may not drop to 0 1 to 0 psi Gauge 0 05 to 0 MPa or the protection function may operate due to the pressure increase in the high pressure refrigerant cir cuit If this occurs use a refrigerant collecting device to collect all of the refrigerant in the system and then recharge the system with the correct amount of refrigerant after the indoor and outdoor units have been relocated 7 Turn off the breaker Remove the pressure gauge and the refrigerant piping WARNING When pumping down the refrigerant stop the compressor before disconnecting the refrigerant pipes The compressor may burst and cause injury if any foreign substance such as air enters the pipes OBH702A s MXZ 3C24NA Non Duct 06 06 09 Duct 09 09 09

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