SUZ Service Manual
Contents
1. Bus bar voltage Smoothing Smoothing Smoothing capacitor capacitor capacitor F F701 Back side of unit DB61 use DC 260 325 C62 C61 T3 15 AL 250 V AC 208 230 V EE R V coil CN721 208 230 Eos er SE E I ue E A ANO ZS o i 5M o o ios o o ZUM pest um Fuse F901 tL UC ML ME Bul T315AL 250 mud d uu CREDE um ot GAP po gal g eR D s o Output to drive T pr es m iur Dun BE LDU qm dem qu 0 AC 208 gt BO CASU we d em 230 V LDW PRESE di cl ien mp Paru MES E EOM A Me a d S CH SE SE gg HP uc 24 gp S op H E S dog EI AUD 5 BT gt m ge CC 9 Oxia P o 5 9 5 5 5 LED LEV Jumper wire Jumper wire fa 2 5 To t 8 connector for changing for pre heat om 22. OH YOLSINUSHL WAL INZIGNY 9919 07 om 102 3AWAONISN3ASH SI MWOISINMSHLdSINH volu e Avis 99 9 WOISINHSHLdASI3ONVHOSIQ 2918 TINGOW MO IN3SITIBINI Wal pjey 04 juo siojonpuoo 1eddoo esp 2 WS3AHOJSNVML L t WOISINH3HIlISONd3d 1919 H3MOd IN3OITISINL 2089 Bum UYOLSISNVYL YIMOd ONIHOLIMS 17881 NOLLOSLOBd 9901 49014 NOlLdO USIVSH 1509390 aly Ou Dag epis jnoqy Y00719 WNINYAL 291 91 YOLOW Mei Aoc st ASN 1063 10831073 SALON MOLSINUSHL dL wem MOSS3HdWOO W JINON 3900 99901990 1v3H YOOGLNO 7100 SAIWANOISNYAXS A1 YOLIOVAVO ONIHLOOWS 99299190 9NLL23NNOO TOINA TOSNAS ON LOANNOD EIDEN EIDEN 0 1044 o5 209 eseud A31 AW En _ NUS 8 WE me 9 5 S 6914 9914 8914 7914 169 zs SIYIM 9NLO3NNO9 zT MES eo EN H H BE H L orti e See EEN iia ton eq 1901 1901 9 6 6 6
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4. lt gt Fuse F801 R V coil AC 208 230 V CN721 250 3 15A gt 208 230 AE DS DEEG DEET S E OS N E arn 5 8 5 le ol oj T P 2 Sa m 5 o e o I a T3 15AL250V Fuse F901 k E E E T315AL250V O mi em Exe H sy H ra o o JE edy E bf O00 0 57 E E ie sc if T Output to m WW m SEN fees drive MENS as d e compressor 4 0 sis m A 3 P2 208 LDU LDV a e E 76 89 TO 3 ed BO 0 3 LDW Ge Rei iiie lo Gust ERES KC R Ue BNA BE D Ki Gg Rea he E SE pH SUE gen E 4 np 9 D 000 B semel 270 CU gp A SEL CS C 8 SE Apu m d 00 B gt Gui nr Gi B uw neo a EM 2 ag re DM H n E og Be ez 58 o ole i NUS ai OT Voce DONE OUR S Hacc ELSE SEL a Site c m gt Gn la vir AL Ee INS exe LE Ti gn m Hc emn PE uit Ka c 52 35 5 gt 3 8 S ANG o 2 c 5 c oe Cio 9 bi D 2 A 1 os 50 B 83556 56 Ec i i efa 55 EF EE of 555 Front side of unit o9 t z EH west Ge sr 26 o9 5 2 Lo YES 2Sa SZ GS 2 E
5. 1 E9 Transmitting error Outdoor unit 2 UP Compressor overcurrent interruption 3 U3 U4 Open short of outdoor unit thermistors 14 Others Other errors Refer to the technical manual for the outdoor unit Notes 1 If the beeper does not sound again after the initial 2 beeps to confirm the self check start signal was received and the OPERATION INDICATOR lamp does not come on there are no error records 2 If the beeper sounds times continuously beep beep beep 0 4 0 4 0 4 sec after the initial 2 beeps to confirm the self check start signal was received the specified refrigerant address is incorrect OCH467C 19 ees 10 4 TROUBLE CRITERION OF MAIN PARTS SUZ KA09NA Part name SUZ KA12NA SUZ KA15NA Check method and criterion SUZ KA18NA 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 Inverter P C board in 10 6 TEST POINT DIAGRAM AND VOLTAGE 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 Inverter P C board in 10 6 TEST POINT DIAGRAM AND VOLTAGE for the chart of thermistor Measure the resistance between terminals with a tester Temperature 14 to 10
6. 32 12 DISASSEMBLY INSTRUCTIONS 35 PARTS CATALOG OCB467 1 COMBINATION OF INDOOR AND OUTDOOR UNITS Indoor unit Outdoor unit Heat pump type SUZ Service Ref Service SEZ KDO9NA4 TH SEZ KD12NA4 TH SEZ KD15NA4 TH SEZ KD18NA4 TH HWE08020 Manual No KA09NA TH KA12NA TH KA15NA TH KA18NA TH SLZ KAO9NA TH SLZ KA12NA TH SLZ KA15NA TH eX 3 2 2G 35 I OCH487 OCB487 2 PARTS NAMES AND FUNCTIONS SUZ KA09NA OUTDOOR UNIT SUZ KA12NA SUZ KA15NA CP SUZ KA18NA OUTDOOR UNIT U DIT OCO oCo oooO o oM OCH467C Air outlet Air inlet back and side Drain outlet Air inlet back and side Piping Drain hose Air outlet Drain outlet 3 SPECIFICATION Outdoor unit model SUZ KA09NA SUZ KA12NA SUZ KA15NA SUZ KA18NA Power supply V phase Hz 208 230 1 60 Max fuse size time delay A 15 Min circuit ampacity A 12 12 12 14 Fan motor F L A 0 50 0 93 Compressor KNBO73FQDHC KNB092FQAHC SNB130FQBH R L A 6 6 6 6 7 4 10 0 L R A 8 2 8 2 9 3 12 5 Refrigeration
7. SUZ KA15NA REQUIRED SPACE 29 32 G 7 8 gt handle 2 amp N x Si y 2 11 29 32 ei 2 5 15 16 19 11 16 31 1 2 2 23 32 20 9 32 Drain 3 holes 21 5 16 11 25 32 13 33 7 16 16 15 16 Air out 4 3 8 x 13 16 slot 19 11 16 3 3 16 33 1 16 M 4 25 32 J 7 H 2 gt E EE SS E EI NS S NS OCH467C 6 23 32 REQUIRED SPACE Open as a rule 20 inches or more if the back Liquid pipe as pipe Unit inch Basically open 4 inches or more without any obstruction in front and on both sides of the unit Open two sides of left right or rear side 1 4 flared 3 8 flared KA09 12 1 2 flared KA15 Open as a rule 20 inches or more if the front and both sides are open 4 inches or more 8 inche or more if there are obstacles to both sides both sides and top are open 8 11 32 Liquid 1 4 flared Gas 1 2 flared SUZ KA12NA WIRING DIAGRAM 5 SUZ KA09NA
8. 3 Troubleshooting procedure 1 First check if the OPERATION INDICATOR lamp is blinking ON and OFF to indicate an abnormality 2 Before servicing check that the connector and terminal are connected properly 3 When the electronic control P C board seems to be defective check the copper foil pattern for disconnection and the components for bursting and discoloration 4 Refer to 10 2 TROUBLESHOOTING CHECK TABLE and 10 3 HOW TO PROCEED SELF DIAGNOSIS OCH467C 14 10 2 TROUBLE SHOOTING CHECK TABLE SUZ KA09NA Symptoms LED indication check code SUZ KA12NA Abnormal point Condition SUZ KA15NA Condition SUZ KA18NA Remedy Outdoor unit does not op erate 1 time flash every 2 5 seconds UP Outdoor power sys tem Overcurrent protection cut out operates 3 consecutive times within 1 minute after the compressor gets started Reconnect connector of compressor Refer to 10 5 How to check in verter compressor eCheck stop valve Outdoor thermistors U4 Discharge temperature thermistor shorts or opens during compressor running Refer to 10 5 Check of outdoor thermistors Fin temperature thermistor defrost thermistor P C board temperature thermistor outdoor heat exchanger temperature thermistor or ambient temperature thermistor shorts or opens during compressor running FC Outdoor control system Nonvolatile memory data ca
9. Electromagnetic noise enters into TV sets radios Is the unit grounded No Ground the unit Yes Is the distance between the antennas and the indoor unit within 9 91 ft or is the distance between the antennas and Yes the outdoor unit within 9 91 ft No Extend the distance between the antennas and the indoor unit and or the antennas and the outdoor unit radios and the indoor unit within 3 28 Extend the distance between the TV sets and or ft or is the distance between the TV radios and the indoor unit or the TV sets or sets or radios and the outdoor unit Yes radios and the outdoor unit within 9 91 ft Is the distance between the TV sets or No Are the antennas damaged Is the coaxial cable damaged Replace or repair the antenna Is there any poor contact in the anten Yes Replace or repair the coaxial cable na wiring Is the indoor outdoor connecting wire Extend the distance between the indoor outdoor of the air conditioner and the wiring of connecting wire of the air conditioner and the wir the antennas close Yes ing of the antennas Even if all of the above conditions are fulfilled the electromagnetic noise may enter depending on the electric field strength or the installation condition combination of specific conditions such as antennas or wiring Check the followings before asking for service 1 Devices affec
10. Is there any miswiring poor contact or wire disconnection of the indoor outdoor connect ing wire Correct them Yes No lt Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not miswiring Short circuit outdoor terminal block S2 and S3 Y Turn ON the power supply Y 1 Miswiring may damage indoor electronic control P C board during the operation Be sure to confirm the wiring is correct before the opera tion starts 3 Be sure to check this within 3 minutes after turning ON After 3 minutes LED blinks 6 times Even when the inverter P C board or the outdoor electronic control P C board is normal LED blinks 6 times after 3 minutes Is the bus bar voltage of the inverter P C board or th to 10 6 TEST POINT DIAGRAM AND VOLTAGE e outdoor electronic control P C board normal Refer Check of power supply No Refer to 10 5 0 Yes lt Does the LED on the inverter P C board or the outdoor electronic control P C board repeat 3 6 second OFF and 0 8 second ON quick blinking 3 Replace the inverter P C board or the outdoor electronic control P C board 2 Yes Y Turn OFF the power supply Turn ON the power supply Remove the short circuit between outdoor terminal block S2 and S3 lt Confirmation of power voltage gt
11. 1 Instantaneous power voltage drop Short time power failure 2 When the power supply voltage is high 9 time flash 2 5 seconds OFF Inverter check mode The connector of compressor is disconnected inverter check mode starts NOTE 1 The location of LED is illustrated at the right figure Refer to 10 6 TEST POINT DIAGRAM 2 LED is lighted during normal operation The flashing frequenc Example When the flashing frequency is 2 i 0 5 second ON 2 5 second OFF OFF 2 5 second OFF OCH467C shows the number of times the LED blinks after every 2 5 second OFF p i 0 5 second ON 15 Check if the connector of the com pressor is correctly connected Refer to 10 5 9 How to check inverter compressor Inverter P C board Flashing LED SS 10 3 HOW TO PROCEED SELF DIAGNOSIS As this air conditioner has a function to memorize all the failures that had occurred the latest failure detail can be recalled by following the procedure below Use this function when the check code is not displayed with wired remote controller or the re mote controller at use is wireless type 10 3 1 Self diagnosis lt PAR 21MAA gt Whena problem occurs to the air conditioner the indoor and outdoor units will stop and the problem is shown in the remote controller display CHECK and the refrigerant address are displayed on the temperature D display and the
12. 0 79 Input 0 670 1 020 0 920 1 140 1 170 1 500 1 380 1 700 Indoor unit SEZ KD09NA4 SEZ KD12NA4 SEZ KD15NA4 SEZ KD18NA4 Power supply V Phase Hz 230 1 60 Input 0 06 0 04 0 07 0 05 0 09 0 07 0 09 0 07 Current 0 51 0 39 0 57 0 46 0 74 0 63 0 74 0 63 Outdoor unit SUZ KA09NA SUZ KA12NA SUZ KA15NA SUZ KA18NA Power supply V phase Hz 230 1 60 Input 0 61 0 98 0 85 1 09 1 08 1 43 1 39 1 63 Current 2 80 4 33 3 64 4 65 4 45 5 96 5 38 6 91 Condensing pressure 398 448 387 386 399 389 373 397 Suction pressure 135 97 135 104 133 96 142 100 Discharge temperature 148 170 162 165 159 182 150 172 Condensing temperature 116 125 114 114 116 115 112 116 Suction temperature 49 33 55 35 46 41 52 33 Electrical circuit Refrigerant circuit Ref pipe length 25 Refrigerant charge R410A Intake air temperature Indoor unit Discharge air temperature per Intake air temperature Outd un OCH467C 11 Representative matching SLZ KA09NA SLZ KA12NA SLZ KA15NA Item Cooling Heating Cooling Heating Cooling Heating Capacity 8400 10900 11100 13600 15000 18000 SHF 0 84 0 77 0 67 Input 0 700 0 930 0 920 1 180 1 460 1 950 5 o T o DI Indoor unit SLZ KA09NA SLZ KA
13. E co 250 O Bo oO 9 EE ITSO oer 0 Da2 De E SEO Or 5254 5 G5 o OC Z gt Se p ke 600 296 GES BE oo 9 s LO 0 See gt Por bei S0 2o 4 5 5 5 Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 365 Fin temperature thermistor RT64 Discharge temperature thermistor RT62 Resistance kO 0 0 TES 0 4 14 32 50 68 86 104 E 32 50 68 86 i 02045458 176 Temperature F Temperature F Temperature F OCH467C 34 11 FUNCTION SETTING 11 1 UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER S series only Each function can be set according to necessity using the remote controller The setting of function for each unit can only be done by the remote controller Select function available from the table 1 Table 1 Function selections 1 Functions available when setting the unit number to 00 Select 00 referring to setting the indoor unit number Setting Initial setting when sent from the factory Function Settings Wired remote Remarks controller o RF thermostat Power failure Not available 01 automatic recovery Available Approx 4 minute wait period after power is restored 101 Indoor temperature detecting The setting e is ap
14. Is there rated voltage between indoor terminal block S1 and S2 Yes Is there amplitude of 10 to 20 VDC between indoor terminal block S2 and S3 Confirmation of serial signal A Turn OFF inverter controlled lighting equipment Turn OFF the power supply and then turn ON again Press TEST button twice Is the self check Reinstall either of the remote con the unit or the troller indicated 6 light away from minutes later gach other OCH467C Yes Y No Lighted or not 2 Be careful of the residual voltage of smoothing lighted capacitor Check the wiring If there are any error of the indoor outdoor connecting wire such as the damage of the wire intermediate connection and or poor contact to the terminal block replace the indoor outdoor connecting wire No Is there rated voltage between indoor termi nal block S1 and S2 Confirmation of power voltage No Is there any error of the indoor out door connecting wire such as the damage of the wire intermediate connection poor contact to the terminal block Is there any error of the indoor out door connecting wire such as the damage of the wire intermediate connection poor contact to the terminal block No Replace the indoor controller P C board 28 Replace the indoor outdoor Yes connecting wire
15. The terminal without locking mechanism can be detached by pulling it out Check the shape of the terminal before detaching 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector has the locking mechanism Slide the sleeve the sleeve and the terminal while pull out the terminal pushing the locking slowly lever Connector SUZ KA09NA SUZ KA12NA SUZ KA15NA NOTE Turn OFF power supply before disassembling OPERATING PROCEDURE PHOTOS 1 Removing the cabinet Photo 1 1 Remove the screw fixing the service panel 2 Pull down the service panel and remove it Screws Sew ofthe 3 Remove the screws fixing the conduit cover of the top cabinet Screws of 4 Remove the conduit cover panel the top panel 5 Disconnect the power supply wire and indoor outdoor connecting wire Back 6 Remove the screws fixing the top panel gt JA 7 Remove the top panel E Be gt 8 Remove the screws fixing the cabinet 9 Remove the cabinet 10 Remove the screws fixing the back panel 11 Remove the back panel 390 Screw of 4 the service Photo 2 J Screw of the H conduit cover Screws of Service the cabinet panel Conduit cover gt s _ Conduit plate OCH467C 35 OPERATING PROCEDURE PHOTOS 2 Removing the inverter assembly inverter P C board 1 Remove the cabinet and panels Refer t
16. Approx 3 sec 0 5 0 5 sec starts X J Start signal Y io EM received Number of blinks beeps in pattern indicates the check Number of blinks beeps in pattern indicates code in the following table e n 5 for U2 the check code in the following table Output pattern A Errors detected by indoor unit Wireless remote controller Wired remote controller Beeper sounds OPERATION Sympt in INDICATOR lamp flashes Check code Number of times 1 P1 Intake sensor error 2 P2 Pipe TH2 sensor error P9 Pipe TH5 sensor error 3 E6 E7 Indoor outdoor unit communication error 4 P4 Drain sensor error Float switch connector CN4F open P5 Drain pump error Forced compressor stop due to water leakage abnormality As for indoor 6 P6 Freezing Overheating protection operation unit refer to 7 EE Communication error between indoor and outdoor units indoor unit s 9 E4 E5 Remote controller signal receiving error Seice manga 12 Fb Indoor unit control system error memory error etc EO Remote controller transmission error E1 E2 Remote controller control board error Output pattern B Errors detected by unit other than indoor unit outdoor unit etc Wireless remote controller Wired remote controller Beeper sounds OPERATION INDICATOR lamp flashes Check code Number of times Symptom Indoor outdoor unit communication error
17. display will flash helps you find the location ofthe indoor unit for which you want to perform function I selection AT T Y Mode number ME nna display section ad Outdoor alas unit If the temperature display flashes 88 this indicates that the selected address di Indoor unit Main Fan mode does not exist in the system Or if the unit No shows F and the address flashes this indicates that the selected unit No does not exist In this case set the correct address and unit No at the steps through Cf Remote conir ller 8 Select the mode number Mode number BD ng Press the ft TEMP buttons and A_ to select the desired mode display section eon number d Only vaild mod b be selected mode numbers selected Mode number 02 Indoor temperature detection Select the setting No in the selected mode Press the TEMP buttons A to select the desired setting Press the MENU button to flash the applying setting No Check the current setting No here 0000 ees Setting number display section Setting number 1 Indoor unit s internal sensor Setting number 3 Remote controller s internal sensor Confirm the settings made at the steps through The mode No and setting No stop flashing to confirm
18. for 5 seconds or more The display content will change as shown below to start self diagnosis When the remote controller malfunctions Error display 1 NG blinks The remote controller s transmitting receiv ing circuit is defective ae epuer gt li Er Remote controller self diagnosis result When the remote controller is functioning correctly SELF CHECK SELF r zB r UE GEN Ec io BE ew Check for other possible causes as there is no problem with the remote The remote controller must be replaced with a new one controller Where the remote controller is not defective but cannot be operated Error display 2 6833 or 6832 blinks Transmission is not possible Error display 3 ERC and the number of data errors are displayed Data error has occurred ERROR CODE Ri There might be noise or interference the transmission path or the indoor unit or other remote controllers are defective Check the transmission path and other controllers SELF CHECK ERL The number of data errors is the difference between the number of bits sent from the remote controller and the number actually transmitted through the transmis sion path If such a problem is occurring the transmitted data is affected by noise etc Check the transmission path SELFCHECK 3 When the number of data errors is 02 Transmis
19. 6 6 Sf z 0 0 o 9 0 ZEBND s cl REES E KIND 6 PHONO LE6NO E T 1 H d n n 0 60H Am 03909 Od YILYIANI L e 709 aseud N e EE ios im 51 Alddn s K MO t CES Lid re y901d W smvaNoud0 t L081 C 3 20801 CR E ps 711179 _ S Mpeg uou eS 1 LS d me re K a BE MIA SA NYO ACL 191 SUZ KA18NA OCH467C 6 REFRIGERANT SYSTEM DIAGRAM SUZ KA09NA Refrigerant pipe 03 8 with heat insulator 4 way valve Stop om Unit inch mm Outdoor heat iT exchanger with service temperature Muffler Outdoor ermistor Flared connection Eege heat RT68 temperature exchanger thermistor RT62 Service port 9 Compressor emperature Service port m thermistor V RT65 Defrost thermistor RT61 E Strainer Capillary tube 100 Flared connection O D 0 118 x 1 0 0 079 x 9 7 16 LEV X 93 0 22 0 240 BS R V coil heating ON 2 T Ee JUL gt lt cooling OFF Stop valve with strainar Refrigerant pipe 21 4 Refrigerant flow in cooling with heat insulator gt Refrigerant flow in heating SUZ KA12NA SUZ KA15NA Unit inch mm Refrigerant pipe 03 8 KA12 Refrigerant pipe 21 2 KA15 4 way valve with heat
20. E go 5z Sa CN724 defrost setting control setting Front side of unit 25 55 S ED gt EE JS JK SS Be L9 BL FE 96 o5 252 59 DL E 5 EG OF BE SE 850 EDS 55 SE gt O Go Be O 25 so KSE 2 Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 5 3 m E E 3 o o a 4 E Discharge temperature thermistor RT62 Resistance kQ Resistance kQ Resistance k 86 104 122 140 158 176 194 212 230 248 Temperature F 30 68 Temperature F 32 Temperature F OCH467C 50 68 86 104 SUZ KA18NA Bus bar voltage Smoothing Smoothing Smoothing capacitor capacitor capacitor F701 DB61 use Back side of unit C63 C62 C61 T3 15 AL250 V DC 260 325 V
21. an analog tester Replace the LEV coil Yes Replace the expansion valve Note After check of LEV turn OFF the power supply and turn ON it again OCH467C 26 D Check of inverter P C board Check the outdoor fan motor Refer to 10 5 CD Check of outdoor fan motor Is the fuse F901 blown on the inverter P C board Yes Check the connection of the connectors CN931 CN932 of the outdoor fan motor If the connection is poor make it correct Operate the outdoor unit by starting TEST RUN Check the LED indication on the in remedy following LED verter P C board Does the LED flash 10 times Refer to 10 3 HOW TO PRO CEED SELF DIAGNOSIS Yes 10 time flash Replace the inverter P C board E OCH467C 27 How to check miswiring and serial signal error Tum OFF the power supply Is there rated voltage in the power supply Check the power supply No Check the wiring No Y Yes Turn ON the power supply lt Is there rated voltage between outdoor terminal block S1 and S2 yres Press TEST button twice Y Does POWER lamp on remote controller light up Confirmation of the power to the indoor unit No Yes Y Is the self check of the remote controller indicated 6 minutes later Yes
22. check code and unit number are displayed alternately as shown below If the outdoor unit is malfunctioning the unit number will be 00 TEMP ONOFF In the case of group control for which one remote controller controls WIT oC multiple refrigerant systems the refrigerant address and check code ofthe MEN SOS PX unit that first experienced trouble i e the unit that transmitted the check ga hee D rass V OPERATION A code will be displayed To clear the check code press the 0 ON OFF button d Alternating Display ERROR GODE nn Sits LILI e Check code 2 or 4 digits Address 3 digits or unit number 2 digits When using remote local controller combined operation cancel the check code after turning off remote operation During central control by a MELANS controller cancel the check code by pressing the ON OFF button 10 3 2 Self Diagnosis During Maintenance or Service lt PAR 21MAA gt Since each unit has a function that stores check codes the latest check code can be recalled even if it is cancelled by the remote controller or power is turned off Check the error history for each unit using the remote controller Switch to self diagnosis mode Set the unit number or
23. insulator ud js 1 Outdoor heat St exchanger with NIS port temperature ara Muffler Outdoor RTOS d Flared connection heat temperature exchanger T thermistor Servi rt RT62 T Compressor Ee Service port Defrost emper thermistor RT65 E RT61 LE Capillary tube A 0 118 x 1 0 0 071 x 23 5 8 Capillary tube 23 0 x 21 8 x 600 2 Strainer Flared connection O D 0 118 x I D 0 079 100 x 9 7 16 LE 23 0 02 0 x 240 EJ eating Ee JUL gt lt cooling OFF Stop valve Refrigerant pipe 21 4 with heat insulator with strainar Refrigerant flow in cooling gt Refrigerant flow in heating OCH467C SUZ KA18NA Unit inch mm Muffler Refrigerant pipe 1 2 with heat insulator Stop valve with service port Flared connection Discharge i temperature Defrost ER thermistor thermistor Service port RTOS Compressor Outdoor heat exchanger temperature thermistor RT68 Flared connection Receiver 100 R V coil heating ON mS Stop valve Capillary tube cooling with strainar 0 142 x I D 0 094 Refrigerant pipe 21 4 x 1 31 32 gt Refrigerant flow in cooling with heat insulator 63 6x92 4x50 gt Refrigerant flow in heating MAX REFRIGERANT PIPING LENGTH and MAX HEIGHT DIFFERENCE Refrigerant piping ft Piping
24. the resistance of outdoor fan motor normal Replace the outdoor fammetor Refer to 10 4 TROUBLE CRITERION OF MAIN PARTS No poria Yes Replace the inverter P C board SUZ KA18NA Check the connection between the connector CN931 and CN932 Is the resistance between each termi nal of outdoor fan motor normal Refer to 10 4 TROUBLE CRITERION Yes i OF MAIN PARTS Disconnect CN932 from the inverter P C board and turn on the No power supply Rotate the outdoor fan motor manually and measure the voltage of CN931 Between 1 and 5 Between 2 and 5 Between 3 and 5 Y Fixed to either 5 VDC Does the voltage between each terminal become 5 and 0 No N VDC repeatedly Yes Y lt No Does the outdoor fan motor rotate smoothly Yes Y Y Replace the outdoor fan motor Replace the inverter P C board OCH467C 24 J Check of power supply Disconnect the connector CN61 between compressor and intelligent power module Turn ON power supply and press the TEST button twice Does the POWER lamp on remote controller light up Yes Is there bus bar voltage 260 325 VDC between DB61 and DB61 on the inverter P C board Refer to 10 6 TEST POINT DIAGRAM AND VOLTAGE Check the electric parts in main circuit OCH467C Rectify indoor outdoor conne
25. 12NA SLZ KA15NA Power supply V Phase Hz 230 1 60 Input 0 08 0 08 0 09 0 09 0 09 0 09 Current 0 35 0 35 0 40 0 40 0 65 0 65 Outdoor unit SUZ KA09NA SUZ KA12NA SUZ KA15NA Power supply V phase Hz 230 1 60 Input 0 63 0 86 0 84 1 10 1 38 1 87 Current 3 12 4 02 3 82 4 93 5 98 8 10 Refrigerant circuit Condensing pressure 401 406 379 418 422 475 Suction pressure 147 104 139 106 128 98 Discharge temperature 154 169 152 173 174 188 Condensing temperature 116 117 111 118 118 128 Suction temperature 52 34 51 36 51 31 Ref pipe length Refrigerant charge R410A Indoor unit Intake air temperature Discharge air temperature Outd unk Intake air temperature OCH467C 12 8 ACTUATOR CONTROL SUZ KA09NA SUZ KA12NA SUZ KA15NA SUZ KA18NA 8 1 OUTDOOR FAN MOTOR CONTROL The fan motor turns ON OFF interlocking with the compressor ON The fan motor turns ON 5 seconds before the compressor starts up OFF The fan motor turns OFF 15 seconds after the compressor has stopped running 5 seconds 15 seconds H lt Compressor OFF ON SE 8 2 R V COIL CONTROL OFF Heating DEE ON Cooling Ge UR AE RP EE eg OFF Uf roe ebore bees e bp EE OFF NOTE The 4 way valv
26. 15 C and TEST buttons to set the modes 15 through 28 FUNCTION 5 wos The cerection Will flash for a while and show as below Sy FUME TIM ae es Aadress SELECTION 25 display section FUNCT ie s IO gt SELECTIOH i n Lu If the E A and temperature displays flash 8 8 for 2 seconds and stop flashing this seems to be an error Check for noise source or interference around the transmission path Note If the operation is made incorrectly before completion finish operation by going to the step and restart from the step Set the indoor unit No Press the CLOCK buttons and _A_ to indicate the indoor unit Press the ON OFF button to flash in the unit No display No in turn such as 00 02 03 04 AL Select the unit No to which the function selection applies P Unit number FUNCTION nn FUMCTION nnnh e SELECTION EIE SELECTION Dd display section gt To set the modes 01 through 06 or 15 through 22 select 00 To set the modes 07 through 14 or 23 through 28 select 01 or 02 Confirm the address and unit No When the address and unit number are confirmed by pressing the Press the MODE button to confirm the address and unit No button the corresponding indoor unit will start fan operation This After a while the mode No
27. 4 F 10 to 40 C Normal KA12 KA09 KA15 18 1 36 to 1 93 1 52 to 2 17 0 78 to 1 11 WHT RED BLK U e Outdoor fan motor Measure the resistance between lead wires with a tester Temperature 14 to 104 F 10 to 40 Normal KA09 12 15 Color of lead wire KA18 RED BLK BLK WHT WHT RED 28 to 40 11 to 16 WHT RED BLK V coil 2154 Measure the resistance with a tester Temperature 14 to 104 F 10 to 40 C Normal 0 97 to 1 38 Expansion valve coil LEV OCH467C Measure the resistance with a tester Temperature 14 to 104 F 10 to 40 C Color of lead wire Normal Q WHT RED RED ORN YLW BRN BRN BLU 37 to 54 20 10 5 TROUBLESHOOTING FLOW How to check inverter compressor Disconnect the connector CN61 between compressor and the intelligent power module IPM Y Check the voltage between terminals See 10 5 Check of open phase y Are the voltages balanced No Replace the inverter P C board Yes Check the compressor See 10 5 Check of compressor Check of open phase e With the connector between the compressor and the intelligent power module disconnected activate the inverter and check if the inverter is normal by measuring the voltage balance b
28. Check that the remote controller s display has stopped before continuing Select the refrigerant address of the indoor unit for the self diagnosis Note Set refrigerant address using the outdoor unit s DIP switch SW1 For more information see the outdoor unit installation manual If an air conditioner error occurs the indoor unit s sensor emits an intermittent buzzer sound the operation light flashes and the check code is output It takes 3 seconds at most for check code to appear The check mode is cancelled Refer to the following tables for details on the check codes Output pattern A Beeper sounds Beep Beep Beep Beep Beep Beep Beep OPERATION del Ed A EN 2 wel 2 Repeated INDICATOR PES lamp flash Off On On On On Off On On pattern Self check Approx 2 5 sec 0 5 sec 0 5 sec 0 5 sec 0 5 sec Approx 2 5 sec 0 5 sec 0 5 sec starts 7 Start signal Ka d Nen received Number of blinks beeps in pattern indicates the check Number of blinks beeps in pattern indicates code in the following table e n 5 for P5 the check code in the following table Output pattern B Beepersounds Beep Beep Beep Beep Beep Beep Beep OPERATION 18 2nd 3 H n T dst 2nd Repeated INDICATOR gt gt gt gt lamp flash Off On On On On Off On On On pattern Self check Approx 2 5 sec Approx 3 sec 0 5 sec 0 5 sec 0 5 sec 0 5 sec Approx 2 5 sec
29. ECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2010 MITSUBISHI ELECTRIC CORPORATION Distributed in May 2014 No OCH467 REVISED EDITION C Distributed in Aug 2011 No OCH467 REVISED EDITION B Distributed in Jul 2011 No OCH467 REVISED EDITION A Distributed in Jan 2010 No OCH467 PDF 4 Made in Japan New publication effective May 2014 Specifications are subject to change without notice
30. MITSUBISHI ELECTRIC Changes for the Better SPLIT TYPE HEAT PUMP AIR CONDITIONERS SERVICE MANUAL R410A Outdoor unit Model Names SUZ KA09NA SUZ KA12NA SUZ KA15NA SUZ KA18NA PIT SS Cc SS SoS SS C e SS Cc Cc C Cc Cc e Cc SS SS SS Ss Su SS Ss Ss mu Ss C gt SS SUZ KA18NA TH Service Ref SUZ KA09NA TH SUZ KA12NA TH SUZ KA15NA TH SUZ KA18NA TH Ths senice manual describes May 2014 No OCH467 REVISED EDITION C HFC utilized R410A Revision Modified some contents in 10 TROUBLESHOOTING REVISED EDITION C Some other descriptions have been also modified Please void OCH467 REVISED EDITIN B service data of the outdoor units only RoHS compliant products have lt G gt mark on the spec name plate CONTENTS 1 COMBINATION OF INDOOR AND OUTDOOR UNITS 2 2 PARTS NAMES AND FUNCTIONS 2 39 SPECIFICATION ERU IET 3 4 OUTLINES AND DIMENSIONS 4 5 innnan nianna 5 6 REFRIGERANT SYSTEM 8 ABA IRE 11 8 ACTUATOR 13 9 SERVICE 14 10 14 11 FUNCTION
31. MOd ONIHOLIMS Laut 1991034 UCD 6921499214 1 NOLLdOJH31V3H 1508430 H Buum Joopur au wua 91191 1 1 3nd 10631083013 0 epis 1 305535400 M 31100 30010 98071980 SALON YOOGLNO 102 3MVA NOISNYdX3 Aq 9NIHLOONS 99 299 190 i ENER 08NAS SVN JO8NAS TOSWAS 2 09 aseyd 062 802 SIYM ONILOANNOD pg 8 pel LINN HOOQNI Joe 8 ech D mm S LINN HOOQNI 01 27 038 T LE Zw i E SS gle oo 0660005 59 99 z o 66 555 zem EES E SINT 9 2 EONO 93 cv9NO t Qquvog 2d 2600 eseud UI WEN M __ A cri UM pill ie e d nam n OW 089 T a 7662 d Ee M Adi X18 I Wm THM THM A 1064 Kei M Geesen A bod vd 140 a id Se d 199 295 99 FEO ES EE EE e e e e 19806 9990 D S WE mg FEL MWA NYO BEA SUZ KA15NA OCH467C
32. Measure the resistance between the lead wires at 3 points WHT RED lt lt Judgement gt gt Refer to 10 4 TROUBLE CRITERION OF MAIN PARTS 0 0 short Infinite Q Abnormal open NOTE Be sure to zero the ohmmeter before measurement E Check of compressor operation time lt lt Judgement gt gt eConnect the compressor and activate the inverter Then measure 0 second the time until the inverter stops due to over current lt lt Operation method gt gt 1 second P Abnormal Start heating or cooling operation by pressing the TEST button E failure twice on the remote controller Test run mode 2 seconds Compressor winding short TEST RUN OPERATION Refer to 10 5 Abnormal lt lt Measurement gt gt Starting dele lock out Measure the time from the start of compressor to the stop of Starting defect compressor due to overcurrent 10 seconds Abnormal Refrigerant circuit defect Closed valve 10 minutes E Check of compressor start failure Confirm that 1 4 is normal Electrical circuit check 1 Contact of the compressor connector including CN61 2 Output voltage of inverter P C board and balance of them See 10 5 3 Direct current voltage between DB61 and on the inverter P C board V 4 Voltage between outdoor terminal block 51 52 Does the compressor run for 10 seconds or Check the
33. N61 4 Remove the screws fixing the relay panel See Photo 3 5 Remove the inverter assembly See Photo 4 6 Remove the screw of the ground wire and screw of the T B support See Photo 4 7 Remove the screw of the PB fixture 8 Remove the relay panel from the PB support 9 Remove the inverter P C board from the inverter assembly Photo 4 Inverter assembly Hook of the Inverter P C Screw of the PB support board T B support 3 Removing R V coil 1 Remove the cabinet and panels Refer to procedure 1 2 Disconnect the following connectors lt Inverter P C board gt CN721 coil 3 Remove the R V coil See Photo 5 Heatsink PB support T B support D D Relay panel Screw of the j ground wire Hook of the Screw of the PB support PB fixture Photo5 Welded parts of 4 way valve OCH467C 39 OPERATING PROCEDURE PHOTOS 4 Removing the discharge temperature thermistor Photo 6 defrost thermistor outdoor heat exchanger tempera Outdoor heat Arien ture thermistor and ambient temperature thermistor exchanger temperature thermistor 1 Remove the cabinet and panels Refer to procedure 1 thermistor 2 Disconnect the lead wire to the reactor and the following connectors Inverter P C board ke CN641 Defrost thermistor and discharge temperature ther f mistor CN643 Ambient temperature thermistor CN644 Outdoor heat e
34. Nn Not available N 2 For the detail of Heater control refer to the service manual of SEZ KD NA4 8 4 degC 7 2 degF up External static pressure 5Pa 0 02in WG Mode No 08 Setting No 9 Initial setting Mode No 10 Factory setting Check 15Pa 0 06in WG 35Pa 0 14in WG 50Pa 0 20in WG OCH467C 32 11 1 1 Selecting functions using the wired remote controller First try to familiarize yourself with the flow of the function selection procedure In this section an example of setting the room temperature detection position is given For actual operations refer to steps to D Setting number Refrigerant address Unit number Mode number C O BSB Jj TEMP DOoN FF G Cv CA 20382 OMENU ON OFF S FILTER Ge emm uum xu ND f Modes 01 to 14 can be activated CAD C GA by pressing buttons 9 and Lotion ZE A simultaneously and modes 15 to i 28 by pressing buttons and Q C D Selecting functions using the wired remote controller Check the function selection setting Switch to function setting mode For modes 15 and higher Press 9 and at the same time press and at the same time with stop the remote controller
35. Specify refrigerant address 00 outdoor unit Specify unit No 00 indoor unit Use and G Enter the setting Specified indoor unit Press FAN operation Change refrigerant Select mode No 02 address or unit No room temperature detection position Select setting No 03 remote controller fixed Use Example Selecting room temperature detection position Enter the setting Press End function display Press and 9 at the same time The above procedure must be carried out only if changes are necessary 33 OCH467C Operating Procedure D Check the function selection settings Changing the function selection settings for each mode will change its relevant mode function Perform steps through to check all the function selection settings and write down the current settings in the Check column of the function selection Table 1 gt in the chapter 11 1 and then change the settings as necessary For the initial settings refer to the Table 1 gt in the chapter 11 1 The following is the procedure to operate the remote controller internal sensor 2 Turn off the remote controller 9 Set the outdoor address Hold down 2 buttons simultaneously for 2 seconds the FILTER Press the CLOCK buttons and to select the desired and TEST buttons to set the modes 01 through 14 and the address The address changes from 00 to
36. air passage e Refer to 10 5 D Check of outdoor fan motor 5 time flash 2 5 seconds OFF High pressure pro tection Indoor coil thermistor exceeds 70 in HEAT mode Defrost thermistor exceeds 70 in COOL mode Check refrigerant circuit and refrig erant amount Check stop valve 8 time flash 2 5 seconds OFF Compressor syn chronous abnormal The waveform of compressor current is distorted Reconnect connector of compressor Refer to 10 5 How to check in verter compressor 10 time flash 2 5 seconds OFF Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start up Refer to 10 5 0 Check of outdoor fan motor Refer to 10 5 Check of inverter P C board 12 time flash 2 5 seconds OFF Each phase current of compressor Each phase current of compressor cannot be detected nor mally Refer to 10 5 How to check in verter compressor 13 time flash 2 5 seconds OFF DC voltage DC voltage of inverter cannot be detected normally Refer to 10 5 9 How to check in verter compressor Outdoor unit operates 1 time flash 2 5 seconds OFF Frequency drop by current protection When the input current exceeds approximately 7A KA25 8A KA35 12A KA50 14A KA60 16A KA71 compressor frequency lowers 3 time flash 2 5 seconds OFF Frequency drop by high pressure pro tect
37. cting wire Yes Is there voltage 208 230 VAC between the indoor terminal No block 51 and S2 Replace the indoor electronic control P C board Does LED on the inverter P C board light up or flash Refer to 10 6 TEST Replace the inverter POINT DIAGRAM AND VOLTAGE No P C board Nes If light up OK 260 325 VDC If flash refer to 10 3 HOW TO PROCEED SELF DIAGNOSIS OF Inverter P C board Solder side 25 K Check of LEV Expansion valve Self check start Refer to 10 2 TROUBLESHOOTING CHECK TABLE Y Expansion valve operates in full opening direction Y Note Do you hear the expansion valve click Regardless of normal or abnormal condition a short beep is emitted once the signal is received Click Beer 2 Do you feel expansion valve vibrate Yes on touching it Is LEV coil properly fixed to No gt Properly fix the LEV coil to the expansion valve the expansion valve veS Measure each voltage between connector pins of CN724 on the inverter P C board Does the resistance of LEV 1 Pin Pin coil have the characteristics 2 Pin Pin Replace the inverter P C Refer to 10 4 TROUBLE CRITERION Yes 3 Pin Pin No board OF MAIN PARTS es 4 Pin Pina No Is there about 3 5 VAC between each NOTE Measure the voltage with
38. defrost thermistor from its holder See Photo 6 5 Pull out the outdoor heat exchanger temperature thermistor from its holder See Photo 6 6 Pull out the ambient temperature thermistor from its holder OCH467C 36 Photo 3 Screws of the relay panel Photo 4 Inverter assembly Screw of the T B support Inverter Heatsink P C board T B support Screw of the Relay panel ground wire Photo 5 R V coil Discharge temperature thermistor OPERATING PROCEDURE PHOTOS 5 Removing outdoor fan motor 1 Remove the cabinet and panels Refer to procedure 1 2 Disconnect the following connectors Inverter P C board CN931 CN932 Fan motor 3 Remove the propeller nut See Photo 7 4 Remove the propeller See Photo 7 5 Remove the screws fixing the fan motor See Photo 7 6 Remove the fan motor Outdoor heat exchanger temperature thermistor 3 1 6 Removing the compressor and 4 way valve 1 Remove the cabinet and panels Refer to procedure 1 2 Remove the inverter assembly Refer to procedure 2 3 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 PSIG Photo 7 4 Detach the welded part of the suction and the discharge pipe connected with compressor 5 Remove the nuts of compressor legs 6 Remove the compressor 7 Detach the welded part of pipes connected with 4 way valve See Photo 8 P
39. e reverses for 5 seconds right before start up of the compressor COOL HEAT 5 seconds 5 seconds ON dt Compressor ON OFF Outdoor _ az us _ accen motor OFF 8 3 RELATION BETWEEN MAIN SENSOR AND ACTUATOR Actuator Outdoor fan Indoor fan motor R V coil motor Sensor Purpose Compressor Discharge temperature Protection thermistor 3 Cooling Coil frost prevention Indoor coil temperature thermistor Heating High pressure protec tion Defrost thermistor Heating Defrosting Fin temperature thermistor Protection Ambient temperature Cooling Low ambient tempera thermistor ture operation Cooling Low ambient tempera Outdoor heat exchanger tem ture operation perature thermistor Cooling High pressure protec tion OCH467C 13 9 SERVICE FUNCTIONS SUZ KA09NA SUZ KA12NA SUZ KA15NA SUZ KA18NA 9 1 CHANGE IN DEFROST SETTING Changing defrost finish temperature JS To change the defrost finish temperature cut solder the JS wire of the outdoor inverter P C board Refer to 10 6 TEST POINT DIAGRAM AND VOLTAGE J mp t Defrost finish temperature SUZ KA09 12 15 SUZ KA18 Soldered 41 5 48 9 Initial setting Cu 50 10 64 18 9 2 PRE HEAT CONTROL SETTING PRE HEAT CONTROL When moisture gets into the refrigerant cycle it may interfere the start
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41. etween the terminals Output voltage is 50 130 V The voltage may differ according to the tester lt lt Operation method Test run operation gt gt 1 Press the TEST RUN button twice 2 Press the MODE button and switch to the COOL or HEAT mode 3 Compressor starts at rated frequency in COOL mode or 58 Hz in HEAT mode 4 Indoor fan operates at High speed 5 To cancel test run operation press the ON OFF button on remote controller lt lt Measurement point gt gt at 3 points BLK U WHT V BLK DER Measure AC voltage between the lead wires at 3 points WHT V RED W NOTE 1 Output voltage varies according to power supply voltage 2 Measure the voltage by analog type tester 3 During this check LED of the inverter P C board flashes 9 times Refer to 10 6 TEST POINT DIAGRAM AND VOLTAGE O Check of compressor Refer to 10 5 Check of compressor winding No Replace the compressor Is the compressor normal je Refer to 10 5 Check of compressor operation time No Refer to 10 5 Check of compressor start failure Does the compressor operate continuously Yes OCH467C D Check of compressor winding e Disconnect the connector CN61 between the compressor and intelligent power module and measure the resistance be tween the compressor terminals Measurement point at 3 points BLK WHT BLK RED
42. he previous page twice When the error history is reset the display will look like the one shown below within 3 seconds The self diagnosis address or refrigerant address will blink However if you fail to resetthe error history the error content will be displayed again HECK SELFCHECK 2707 Ge m nn UU d UU amp Cancel self diagnosis Self diagnosis can be cancelled by the following 2 methods Press the CHECK button in the picture in the previous page Self diagnosis will be cancelled and the screen will return to the previous state in effect twice within 3 seconds before the start of self diagnosis Press the ON OFF button in the picture in the previous page Self diagnosis will be cancelled and the indoor unit will stop 10 3 3 Remote Controller Check lt PAR 21MAA gt If the air conditioner cannot be operated from the remote controller diagnose the remote controller as explained below D First check that the power on indicator is lit S If the correct voltage DC12 V is not supplied to the remote controller the SELF indicator will not light If this occurs check the remote controller s wiring and the indoor unit E Power on indicator 9 Switch to the remote controller self diagnosis mode Press the CHECK button in the picture in the previous page Press the FILTER button in the picture in the previous page
43. ion Temperature of indoor coil thermistor exceeds 131 F 55 C in HEAT mode compressor frequency lowers Frequency drop by defrosting in COOL mode Indoor coil thermistor reads 46 F 8 C or less in COOL mode compressor frequency lowers The unit is normal but check the following Check if indoor filters are clogged Check if refrigerant is short Check if indoor outdoor unit air circulation is short cycled 4 time flash 2 5 seconds OFF Frequency drop by discharge tempera ture protection Temperature of discharge temperature thermistor exceeds 232 F 111 C compressor frequency lowers Check refrigerant circuit and refrig erant amount Refer to 10 5 Check of LEV Refer to 10 5 0 Check of outdoor thermistors 7 time flash 2 5 seconds OFF Low discharge tem perature protection Temperature of discharge temperature thermistor has been 122 F 50 C or less for 20 minutes Refer to 10 5 Check of LEV Check refrigerant circuit and refrig erant amount 8 time flash 2 5 seconds OFF PAM protection PAM Pulse Ampli tude Modulation The overcurrent flows into IGBT Insulated Gate Bipolar tran sistor TR821 or the bus bar voltage reaches 320 V or more PAM stops and restarts Zero cross detecting circuit Zero cross signal for PAM control cannot be detected This is not malfunction PAM pro tection will be activated in the fol lowing cases
44. nnot be read properly Replace inverter P C board 6 time flash 2 5 seconds OFF ES 9 Serial signal The communication fails between the indoor and outdoor unit for 3 minutes Check indoor outdoor connecting wire Replace indoor or outdoor P C board if abnormality is displayed again 11 flash 2 5 seconds OFF UE Stop valve Closed valve Closed valve is detected by compressor current Check stop valve Outdoor unit stops and restarts 3 minutes later is repeated 2 time flash 2 5 seconds OFF Overcurrent protec tion Large current flows into intelligent power module Reconnect connector of compressor Refer to 10 5 9 How to check in verter compressor Check stop valve 3 time flash 2 5 seconds OFF Discharge tempera ture overheat pro tection Temperature of discharge temperature thermistor exceeds 116 C compressor stops Compressor can restart if discharge temperature thermistor reads 100 or less 3 minutes later Check refrigerant circuit and refrig erant amount Refer to 10 5 Check of LEV 4 time flash 2 5 seconds OFF Fin temperature P C board tem perature thermistor overheat protection Temperature of fin temperature thermistor on the heat sink exceeds 72 to 86 or temperature of P C board temperature thermistor on the inverter P C board exceeds 72 to 85 Check around outdoor unit Check outdoor unit
45. o procedure 1 2 Disconnect the lead wire to the reactor and the following connectors Inverter P C board CN721 R V coil CN931 CN932 Fan motor CN641 Defrost thermistor and discharge temperature ther mistor CN643 Ambient temperature thermistor CN644 Outdoor heat exchanger temperature thermistor CN724 LEV 3 Remove the compressor connector CN61 4 Remove the screws fixing the relay panel See Photo 3 5 Remove the inverter assembly See Photo 4 6 Remove the screw of the ground wire and screw of the T B support See Photo 4 7 Remove the relay panel from the inverter assembly 8 Remove the inverter P C board from the relay panel 3 Removing R V coil 1 Remove the cabinet and panels Refer to procedure 1 2 Disconnect the following connectors Inverter P C board CN721 R V coil 3 Remove the R V coil See Photo 5 4 Removing the discharge temperature thermistor defrost thermistor outdoor heat exchanger tempera ture thermistor and ambient temperature thermistor 1 Remove the cabinet and panels Refer to procedure 1 2 Disconnect the lead wire to the reactor and the following connectors lt Inverter P C board gt CN641 Defrost thermistor and discharge temperature ther mistor CN643 Ambient temperature thermistor CN644 Outdoor heat exchanger temperature thermistor 3 Pull out the discharge temperature thermistor from its holder See Photo 5 4 Pull out the
46. oil oz Model 10 8 NEO22 15 2 NEO22 Refrigerant control Linear expansion valve Sound level Cooling dB A 49 49 54 Heating dB A 51 51 56 Defrost method Reverse cycle Dimensions W 31 1 2 33 1 16 D 11 1 4 13 H 21 5 8 33 7 16 Weight 77 80 119 External finish Munsell 3Y 7 8 1 1 Control voltage by built in transformer 12 24 Refrigerant piping Not supplied Refrigerant pipe size Min wall thickness Liquid 1 4 0 0315 Gas 3 8 0 0315 1 2 0 0315 Connection method Indoor Flared Outdoor Flared Between the indoor amp outdoor units Height difference 40 50 Piping length 65 100 Refrigerant charge R410A Note Test conditions are based on AHRI 210 240 1 Rating conditions 2 b 9 oz 3 Ib 16 oz Cooling Indoor 80 F D B 67 F W B Outdoor 95 F D B 75 F WB Heating Indoor 70 F D B 60 F W B Outdoor 47 F D B 43 F W B OPERATING RANGE 1 POWER SUPPLY Rated voltage Guaranteed voltage V Outdoor unit OCH467C 208 230 V 1 phase 60 Hz 208 230 253 4 OUTLINES AND DIMENSIONS SUZ KA09NA Air in c 1 3 4 15 3 4 Air in SUZ KA12NA Drain hole 1 5 8 2 3 8 x 13 16 Oval hole
47. plied to all the units in the same refrigerant system Indoor unit s internal sensor Data from main remote controller 1 Not supported Supported indoor unit dose not intake outdoor air through LOSSNAY Supported indoor unit intakes outdoor air through LOSSNAY Power supply 230V voltage 208V Frost prevention 2 36 F Normal temperature 37 F 1 Can be set only when a wired remote controller is used When using 2 remote controllers 2 remote controller operation the remote controller with built in sensor must be set as a main remote controller LOSSNAY connectivity C2 N NI gt N 2 Functions are available when setting the unit number to 01 Initial setting Factory setting Function Settings Ceiling conceald Ceiling cassette SEZ KD NA4 SLZ KA NA 100h 2500h No filter sign indicator 5 15 35 50Pa 0 02 0 06 0 14 0 20in WG Filter sign Refer to the table below External static pressure Refer to the table below Set temp 4 5 F ON Heater control 2 Set temp 1 8 F ON Set temperature in heating mode 3 Available Not available Fan speed during the heating thermo OFF Fan speed during the cooling thermo OFF Extra low Stop Set fan speed Set fan speed Stop Detection of abnormality of the pipe temperature P8 Available a Nle
48. refrigerant address you want to diagnose Press the CHECK button in the picture above twice within 3 seconds Press the TEMP buttons Cv and CA in the picture above The display content will change as shown below to selectthe desired number or address The number address changes between 01 and 50 or 00 and 15 SELF SELF nn _ LILI LILI e The refrigerant address will begin to blink approximately 3 seconds after being selected and the self diagnosis process will begin Unit number or refrigerant address to be diagnosed 9 Display self diagnosis results When there is error history For the definition of each check code refer to the indoor unit s installation manual or service handbook Alternating Display SELF BE z SELF d ecd gt Due D Kai nn GN LILI e Check code 2 or 4 digits Address 3 digits or unit number 2 digits When there is no error history When there is no corresponding unit sELFCHECK DDL SELFCHECK peice m MA LILI OCH467C 16 Reset the error history Display the error history in the diagnosis result display screen see step SELF D ERROR GODE EN ennan gopa nn nn LILI o LILI e Press the ON OFF button in the picture in t
49. refrigerant circuit more after it starts Yes Check the stop valve ER After the compressor is heated with a drier does the compressor start No Replace the compressor Yes H ml S Heat the compressor with Compressor start failure Activate pre heat control 6 a drier for about 20 minutes Do not recover refrigerant gas while heating Refer to 9 2 PRE HEAT CONTROL SETTING Heating part OCH467C 22 Check of outdoor thermistors Disconnect the connector of thermistor in the outdoor P C board see below table and measure the resistance of thermistor Y Is the resistance of thermistor normal Replace the thermistor except RT64 When RT64 is Refer to 10 6 TEST POINT DIAGRAM AND VOLTAGE No abnormal replace the inverter P C board Yes Y Reconnect the connector of thermistor Turn ON the power supply and press the TEST button twice Does the unit operate for 10 minutes or more without showing thermistor abnormality wg Replace the inverter board Yes OK Cause is poor contact Thermistor Connector Pin No Defrost Between CN641 pin1 and pin2 Discharge temperature Between CN641 pin3 and 4 Fin temperature Between CN642 pin1 and pin2 Inverter P C board Ambient temperature Between CN643 pin1 and pin2 Outdoor heat exchanger temperat
50. ropeller Propeller nut Photo 8 Welded parts of 4 way valve OCH467C 37 SUZ KA18NA NOTE Turn OFF power supply before disassembling OPERATING PROCEDURE PHOTOS 1 Removing the cabinet Photo 1 1 Remove the screws of the service panel Screw of the top panel 2 Remove the screws of the top panel 3 Remove the screw of the valve cover 4 Remove the service panel 5 Remove the top panel 6 Remove the valve cover 7 Disconnect the power supply and indoor outdoor connect ing wire 8 Remove the screws of the cabinet 9 Remove the cabinet 10 Remove the screws of the back panel 11 Remove the back panel Screws of the cabinet Screws of the cabinet Screws of the back panel Photo 2 Screw of the top panel Screws ofthe cabinet Screw of the H service panel Screw of 2 Screws of the valve g the back cover panel OCH467C 38 OPERATING PROCEDURE PHOTOS 2 Removing the inverter assembly inverter P C board Photo 3 Screws of the relay panel 1 Remove the cabinet and panels Refer to procedure 1 2 Disconnect the lead wire to the reactor and the following con nectors Inverter P C board CN721 R V coil CN931 CN932 Fan motor CN641 Defrost thermistor and discharge temperature ther mistor CN643 Ambient temperature thermistor CN644 Outdoor heat exchanger temperature thermistor CN724 LEV 3 Remove the compressor connector C
51. sion data from remote controller nini run Transmission data on transmission path To cancel remote controller diagnosis Press the CHECK button in the picture in the previous page for 5 seconds or more Remote controller diagnosis will be cancelled PLEASE WAIT and operation lamp will blink After approximately 30 seconds the state in effect before the diagnosis will be restored OCH467C 17 pT 10 3 4 Self diagnosis lt Wireless remote controller gt lt In case of trouble during operation gt When a malfunction occurs to air conditioner both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop lt Malfunction diagnosis method at maintenance service gt CHECK display ON OFF button CHECK button MITSUBISHI ELECTRIC mrt LILI ON OFF TEMP OG 160 MODE AUTOSTART 10 1 CHECK LOUVER _ Kees oO FAN AUTO STOP TESTRU D RESET SEL s brc A OCH467C Procedure 1 Press the CHECK button twice Refrigerant address display 2 Press the temperature 7 Temperature buttons button 3 Point the remote controller at the Se sensor on the indoor unit and press the HOUR button 4 Point the remote controller at the sensor on the indoor unit and press the ON OFF button 18 CHECK lights and refrigerant address 00 flashes
52. size O D in Model Max Length Max Height difference A B SUZ KA09 12 15NA 65 40 Gas Liquid 3 8 KA09 12 1 2 KA15 1 4 SUZ KA18NA 50 1 2 Indoor unit Max Height difference B Max Length A Outdoor unit Height difference limitations are binding regardless of the height position at which either indoor or outdoor is placed higher OCH467C 9 ADDITIONAL REFRIGERANT CHARGE R410A oz Refrigerant piping exceeding 25 ft requires additional refrigerant charge according to the calculation Outdoor unit Refrigerant piping length one way ft precharged 30 40 60 1 Ib 16 oz 2 lb 9 oz 4 86 Calculation X oz 1 62 5 oz ft x Refrigerant piping length ft 25 Outdoor unit Refrigerant piping length one way ft precharged 40 50 60 70 80 3 Ib 16 oz 3 24 5 40 7 56 9 72 11 88 Calculation X oz 1 08 5 oz ft x Refrigerant piping length ft 25 NOTE Refrigerant piping exceeding 25 ft requires additional refrigerant charge according to the calculation OCH467C 10 7 DATA STANDARD OPERATION DATA Representative matching SEZ KD09NA4 SEZ KD12NA4 SEZ KD15NA4 SEZ KD18NA4 Item Cooling Heating Cooling Heating Cooling Heating Cooling Heating Capacity 8100 10900 11500 13600 14100 18000 17200 21600 SHF 0 80 0 76 0 80
53. ted by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor outdoor unit of the air conditioner indoor outdoor wiring grounding wire antennas wiring from antennas receiver Electric field intensity of the broadcast station affected by the electromagnetic noise Presence or absence of amplifier such as booster Operation condition of air conditioner when the electromagnetic noise enters in 1 Turn OFF the power supply once and then turn ON the power supply In this situation check for the electromagnetic noise 2 Within 3 minutes after turning ON the power supply press OPERATE STOP ON OFF button on the remote controller for power ON and check for the electromagnetic noise 3 After a short time 3 minutes later after turning ON the outdoor unit starts running During operation check for the elec tromagnetic noise 4 Press OPERATE STOP ON OFF button on the remote controller for power OFF when the outdoor unit stops but the indoor outdoor communication still runs on In this situation check for the electromagnetic noise OCH467C 29 Ss 10 6 TEST POINT DIAGRAM AND VOLTAGE Inverter P C board SUZ KA09NA SUZ KA12NA SUZ KA15NA
54. the settings Press the MODE button to flash the mode No and setting No and to start registration co ca co p 0000 803 m LI e Li If the mode or setting No shows and the temperature shows 4 this seems to be a transmission error Check for noise source or interference around the transmission path 9 To make additional settings in the FUNCTION SELECTION screen repeat the steps through Note After setting the modes 07 through 14 the modes 23 through 28 cannot be set continuously or vice versa In this case after completing the settings for the modes 07 through 14 or 23 through 28 go to the step 10 to finish setting and restart setting from the step 1 At this point wait for 30 seconds or more before restarting setting Otherwise the temperature may indicate 8 8 Exit the Function Selection screen Hold down 2 buttons simultaneously for 2 seconds or more the FILTER and TEST buttons for the modes 01 through 14 and the c5 and TEST buttons for the modes 15 through 28 After a few seconds the Function Selection screen returns to the OFF screen OCH467C 34 e 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
55. up of the compressor at low outside temperature The pre heat control prevents this interference The pre heat control turns ON when outside temperature is 68 F 20 or below When pre heat control is turned ON compressor is energized About 50 W lt JK gt To activate the pre heat control cut the JK wire of the inverter P C board Refer to 10 6 TEST POINT DIAGRAM AND VOLTAGE NOTE When the inverter P C board is replaced check the Jumper wires and cut solder them if necessary 10 TROUBLESHOOTING SUZ KA09NA SUZ KA12NA SUZ KA15NA SUZ KA18NA 10 1 CAUTIONS ON TROUBLESHOOTING 1 Before troubleshooting check the following 1 Check the power supply voltage 2 Check the indoor outdoor connecting wire for miswiring 2 Take care of the following during servicing 1 Before servicing the air conditioner be sure to turn OFF the main unit first with the remote controller and turn off the breaker 2 Be sure to turn OFF the power supply before removing the front panel the cabinet the top panel and the electronic control P C board 3 When removing the electrical parts be careful 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 housing of the connector DO NOT pull the lead wires X Je Lead wiring Housing point
56. ure Between CN644 pin1 and pin3 Check of R V coil First of all measure the resistance of R V coil to check if the coil is defective Refer to 10 4 TROUBLE CRITERION OF MAIN PARTS In case CN721 is disconnected or R V coil is open voltage is generated between the terminal pins of the connector although no signal is being transmitted to R V coil Check if CN721 is connected Unit operates COOL mode even if it is set to HEAT mode Disconnect connector CN61 between the compressor and the Is there 208 230 VAC between CN721 intelligent power module O and on the inverter P C board Replace the inverter Turn ON the power supply and minutes after the power supply is turned board press the TEST button twice HEAT ON mode Yes Replace the 4 way valve Unit operates HEAT mode even if it is set to COOL mode Disconnect connector CN61 between the compressor and the Is there 208 230 VAC between CN721 intelligent power module and on the inverter P C board 3 Replace the inverter Turn ON the power supply and minutes after the power supply is turned Yes P C board press the TEST button once COOL ON mode No Replace the 4 way valve OCH467C 23 D Check of outdoor fan motor SUZ KA09 12 15NA Disconnect CN932 from the inverter P C board and measure the resistance of the outdoor fan motor Is
57. xchanger temperature thermistor 3 Pull out the discharge temperature thermistor from its hold er See Photo 8 4 Pull out the defrost thermistor from its holder See Photo 6 5 Pull out the outdoor heat exchanger temperature thermistor from its holder See Photo 6 6 Pull out the ambient temperature thermistor from its holder See Photo 6 Removing outdoor fan motor 1 Remove the top panel cabinet and service panel Refer to procedure 1 2 Disconnect the following connectors Inverter P C board CN931 and CN932 Fan motor 3 Remove the propeller Photo 7 4 Remove the screws fixing the fan motor Screws of 5 Remove the fan motor the outdoor fan motor Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to Photo 8 procedure 1 Welded part of the Discharge temperature 2 Remove the back panel Refer to procedure 1 discharge pipe thermistor 3 Remove the inverter assembly Refer to procedure 2 4 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 PSIG 5 Detach the welded part of the suction and the discharge pipe connected with compressor 6 Remove the compressor nuts 7 Remove the compressor 8 Detach the welded part of 4 way valve and pipe See Photo 5 Welded part of the suction pipe OCH467C 40 OCH467C 41 Mir SLIM MITSUBISHI EL
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