Home

Model Numbers:

1.
2. L1 DZ1 7 lt CN38 C83 E28 E33 D C B Ac CN24 CN22 CN19 CN18 LIN P R111 TVON N tel R112 07 C80 o o o o O O R114 R113 17 c62 C64 1C32 2 Dei an IC6 LD 1C3 S c63 cn CN37 DC MOTOR a R115 CN17 T3 T4 ps as R31 R39 R6 e D5 R116 R34 e i R118 R117 ES E eu e 285 S kd E10 2222 L30 Gr e e 8 ee NO E M J pia D15 PAI QI R100 Q3 E E B E 2 22 q R5 R83 B S R16 8 a Get 8 3 G By 9 H Hm E31 Es ES E6 E7 ena cn g Vis a ES C58 y Cc 7t 7 C73 R77 e K j och y V y TE eo CC H DSP1 Dia md r ut Wu M NZ Guo E S D7 D8 DM ieee O CN27 Rizo ges E CN39 I D a PFC CONTROL pa 10 RE Q2 i i CN15 R79 x1 R73 R76 R78 R80 R96 Z 22 1 N P T2B e c55 24 R27 FRIES R29 1C14 o iH Ic2 RE E D28 RGO Hs C67 su C19 CN 1 6 no no CN28 els e a nie R52 Hm aus D31 D10 C40 OC LAIO Ea 2 E R107 ERE C77 4 O S O GEO rios TH C9 lo 1 R54 gz E Rao C18 mag CN10 SEN R S O d on S C 2 rios C23 R53 E C29 or CE Set C30 IC7 D14 D R22 R56 E C60 Am HM D32 7 99998 790 B gg 164 1 rO l R15 NRO 023 R652N Ran LST 22 m Tm O O Do D6 um B 3 2 so 2 Roo C76 1 E O a en 2 ca L 92 9 H HE 2 R46 c32 Ic8 R49 PS i C61 ei ME 3 B M B Be mms O
3. Silent mode O Horizontal 8Vertical Swing Function O Louver Position Memory Function Refrigerant Leakage Detect Self diag Function Hydrophilic Aluminum Fin Anti rust Cabinet Valve Protection Cover PTC Heating Belt O Compressor Crankcase Heater O optional function e Cold Catalyst Filter Eliminate formaldehyde and other volatile organic compounds as well as harmful gases and odors e lonizer Release negative ions eliminate odor dust smoke and pollen particles to give you fresh and healthy air e Plasma Generate a high voltage electrostatic zone absorb and eliminate dust smoke and pollen particles It also deodorizes air as removing tobacco odors garbage smells etc e Silver lon Filter Sterilize bacteria effectively by decomposing cell wall of bacteria e Vitamin C Filter Release Vitamin C which can eliminate active oxygen to beautify the skin e 3M HAM Filter Open hole structure with charged electrostatic effectively capture dust and particles ensure maximum air flow and minimum pressure drop e Bio Filter O Bio filter consists of a specialized biological enzyme and Eco filter The Eco filter catches very small airborne dust particles and bacteria fungi and microbes Biological enzyme kills bacteria by dissolving their cell wall thus eliminating the problem of re polluti
4. If AC is off before power off and AC is required to start up now the compressor will have 1 minute delay when power on Other conditions the compressor will have 3 minutes delay when restarts 8 4 10 Follow me 1 Ifthe indoor PCB receives the signal which results from pressing the FOLLOW ME button on remote controller the buzzer will emit a sound and this indicates the follow me function is initiated But when the indoor PCB receives signal which sent from remote controller every 3 minutes the buzzer will not respond When the unit is running with follow me function the PCB will control the unit according to the temperature from follow me signal and the temperature collection function of room temperature sensor will be shielded but the error detective function of room temperature sensor will be still valid 2 When the follow me function is available the PCB will control the unit according to the room temperature from the remote controller and the setting temperature 3 The PCB will take action to the mode change information from remote controller signal but it will not affected by the setting temperature 4 When the unit is running with follow me function if the PCB doesn t receive any signal from remote controller for 7 minutes or pressing FOLLOW ME button again the follow me function will be turned off automatically and the temperature will control the unit according to the room temperature detected from its own r
5. 21 2 B Off Auto fan action in heating mode For MWOHCO9S MWOHC12S MWOHC18S models L H L 0 2 L H L 0 4 L H L 0 6 L H L 0 8 L H For MWOHC24S model For 9k 12k T1 Ts mainan Frequency F2 FrequencyF8 ro E f Low v E il e so 2 5 amp 36 5jB Awayvave Do 0 Too off lie wee ey A 2 0 6 35 6 8 a team ae Outdoor fan Medium GE EE d ote 1 5 8 34 7 5 D A O aa E 1 0 6 33 8 B l iia e TT EES E High Indoor fan breeze 10s 10s 8 4 3 4 Defrosting mode no longer than 10m 30s Condition of defrosting TA 0 C 32 F When the units are running if the following two xx 60s items are satisfied the units start defrosting The units run with T3 lt 3 C 37 4 F for 40 For 18k 24k models minutes and T3 keeps lower than TCDI C for Frequency F2 Frequency F8 more than 3 minutes on The units run with T3 lt 3 C 37 4 F for 80 E NR MEME MM minutes and T3 keeps lower than K Maz Me ad TCDI 2 C 35 6 F for more than 3 minutes DOM TTD ee ee T4 lt 0 C 32 F on Outdoor fan If the 1 condition and 2 condition items are off dE EE E LLLI satisfied then the program judges if T2 has pisc dh bur uscite b rat donee 42 d T decreased more than 5 C 41 F When T2 has an A ER decreased more than 5 C 41 F enter the
6. 78 MROHC24AS W310 BP R 001 1 8 rar Name o Ambient temperature sensor assembly Condenser assembly Pipe temperature sensor assembly Valve plate Chassis assembly Rear right clapboard assembly e BOM Code 202301310075 2011482G000 201538090077 20 4 Main control board assembly Inverter control board assembly Installation board for E parts 202301300111 20 5 Installation plate 201248300316 20 6 of PCB 201257190085 201238090067 Big handle 1 201237390104 Water collector 201138090002 79 Terminal board assembly Terminal board Liquid valve assembly 1 BOM Code 201338090071 201357190085 201157190010 202301901173 201295200010 203338090315 202301450155 201257190116 201638091091 Front right MEN O clapboard 1 201248200082 22 1 Liquid valve 1 201600740706 assembly Electronic Front panel 201248200103 201601300032 expansion valve Air outlet grille 4 way valve 01238090068 23 1 201638091121 assembly 201100300827 201600720598 i 202400300047 4 Ways valve 201600600119 motor Supporter assembly of fan 1 201257190071 24 Compressor 1 201400601740 motor Crankcase Rear supporter 1 201248200095 25 1 202403101715 electric heater Discharge Top cover assembly 1 201248300309 26 temperature 1 202448200000 sensor assembly Cover of Left supporter 201248400036 27 1 201248390003 inductance Partition board 20125
7. 1 Connect the charge hose to the charging cylinder open the 2 way valve and the 3 way valve Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder If the refrigerant is RA10A make the cylinder bottom up to ensure liquid charge 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air be careful of the liquid refrigerant 3 Put the charging cylinder onto the electronic scale and record the weight 4 Open the valves Low side on the charge set and charge the system with liquid refrigerant If the system cannot be charge with the specified amount of refrigerant or can be charged with a little at a time approximately 150g each time operating the air conditioner in the cooling cycle however one time is not sufficient wait approximately 1 minute and then repeat the procedure 5 When the electronic scale displays the proper weight disconnect the charge hose from the 3 way valve s service port immediately If the system has been charged with liquid refrigerant while operating the air conditioner turn off the air conditioner before disconnecting the hose 6 Mounted the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N m Be sure 23 7 Operation Characteristics Temperature Cooling operation Heating oper
8. OX Main control board Air outlet assembly 201133091008 21 3 201333090678 assembly Ambient T 1 Louver motor 1 202400200070 21 5 temperature sensor 1 202430790040 assembly Pipe temperature Drain hose 1 201101020038 21 6 1 202301300426 sensor assembly Cover of electronic Pipe nut 1 201600330004 21 7 1 201133190184 control box 21 1 NE 201600330002 ul Fan motor capacitor 202401100354 Fix clamp of 201102000305 23 Remote Controller 203355091532 temperature sensor Evaporator 201533090129 24 Seal 202720090001 S 142 Fan motor cover E a 201133090991 201101020011 Asynchronous 202400401301 26 Air freshening filter 201131410703 motor Horizontal louver 15 Bearing holder 1 201119900952 27 1 201133090993 above Horizontal louver 16 Bearing base 1 202719900606 28 below 1 201133090999 elow 12 10 2 Outdoor unit MROHCOOAS t L Bo 7 gt e SR 15 E cet 14 e t vi A D TX e S a 3 a xus 13 079 17 i M S w T t ST e 12 EC A 222 19 1 22 y 21 2 10 e Em ne ui 7 d PU e20 e P ar T e 20 1 t e 22 1 an 20 2 WA S e e 106 KR o e 21 1 ef SS e 23 e 25 ye e 8 e 24 B se 5 a H i 06 y No pan Name Lon BOMCode No pan Name aty BOMCode Ambient 202301300115 Left supporter 201237400400 temperature sensor assembly ET 2011374G0003 Top cover assembly DES 201237900028 C
9. e m CN23 CN14 R94 S o D20 cn RA EEG E1 E c36 Ge E12 C37 R51 1C10 a SE D16 O Sto 4 A ue E T Ha a ux T E 4 LC Dia Bjo CompTop ay 3 Um O T 9 LOW HIGH LR E Kk icis C75 1 4 O C84 1 R58 C41 E 8 8 gms O vm Ti ca R59 CN25 S A to CONdebug1 2 E S 2 EM cas 15 1 apo R67 C46 IC13 ale Se ati ar 16 2 PE po K OU O L OUT mene O FO C51 A O P ces 1 HH O GND CN1 H D3 H CN2 C41 ATA a SEI RY1 4 WAY N FUSE1 RY2 CNG q gt fp TTT LT D RY3 HEAT1 N Jr ME 0 T5A 250VAC o CN9 q a I4 D 7 D ch CNS le b 5 T LIN na H HEAT2 N P2 PTC1 EN HO d CN3 Q1 J 202302130895 RY4 ZR1 N OUT CE KFRSOW BP3T4N1 DC MOTOR 310 D 03 WP1 1 C2 C48 C3 AS1 E E e e b C52 CN4 C5 N IN C6 C7 C8 ZR3 ZR2 P1 casna OWAOSZ VOEL 40 9 3 Diagnosis and Solution 9 3 1 EEPROM parameter error diagnosis and solution EO F4 Malfunction decision Indoor or outdoor PCB main chip does not receive feedback conditions from EEPROM chip Supposed causes e Installation mistake e PCB faulty Trouble shooting Shut off the power supply and turn it on 5 seconds later Is it still displaying the error code Yes v If the EEPROM chip is welded on main PCB replace the main PCB directly Otherwise check No gt Correct the connection whether the EEPROM chip plugged In main PCB well Yes Y Replace the main PCB EEPROM a read on
10. 1 Temperature Sensor Resistance Value Table for T1 12 T3 T4 C K c F kom TR TE Kom TR mo a zs 20 9 R Cw we z ns eo ras 7 pss e Cs rus ar or Le pese 2 02 pense oo Ta 12 soos 20 oa esse oo Cao es o e rere 70 Ls ss pss ape rem mo Ls ie rss 22 90 rama 72 aer a sens 7 Ls x pese e sese 7 Do o pea a0 ros sus 00 Ls e ae s s amo oo s e ase wo o e mee ao 120 see oo o so are so sexe 0 Dis o posses a 27223 o0 e o se se e 2500 0 e e me so we 207 00 58 F 140 142 144 145 147 149 151 153 154 156 158 160 162 163 165 167 169 171 172 174 176 178 180 181 183 185 187 189 190 192 194 196 198 199 201 203 205 207 208 210 K Ohm 2 35774 2 21249 2 19073 2 11241 2 03732 1 96532 1 89627 1 83003 1 76647 1 70547 1 64691 1 59068 1 53668 1 48481 1 43498 1 38703 1 34105 1 29078 1 25423 1 2133 1 17393 1 13604 1 09958 1 06448 1 03069 0 99815 0 96681 0 93662 0 90753 0 8795 0 85248 0 82643 0 80132 0 77709 0 75373 0 73119 0 70944 0 68844 0 66818 0 64862 100 101 102 103 104 105 106 Es 113 114 119 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 139 136 137 138 139 EE AE 214 216 217 219 221 223 225 226 228 230 232 234 FAS 237 239 241 243 244 246 248 250 252 253 255 2
11. 8 1 Operation time in sleep mode is 7 hours After 7 hours the AC quits this mode and turns off 8 4 8 2 Operation process in sleep mode is as follow When cooling the setting temperature rises 1 C 33 8 F be lower than 30 C 86 F every one hour 2 hours later the setting temperature stops rising and indoor fan is fixed as low speed When heating the setting temperature decreases 1 C 33 8 F be higher than 17 C 62 6 F every one hour 2 hours later the setting temperature stops rising and indoor fan is fixed as low speed Anti cold wind function has the priority 8 4 8 3 Timer setting is available 8 4 8 4 When user uses timer off function in sleep mode or sleep function in timer off mode if the timing is less than 7 hours sleep function will be cancelled when reaching the setting time If the timing is more than 7 hours the machine will not stop until reaches the setting time in sleep mode 8 4 9 Auto Restart function The indoor unit is equipped with auto restart function which is carried out through an auto restart module In case of a sudden power failure the module memorizes the setting conditions before the power failure The unit will resume the previous operation setting not including swing function automatically after 3 minutes when power returns If the memorization condition is forced cooling mode the unit will run in cooling mode for 30 minutes and turn to auto mode as 24 C 75 2 F setting temp
12. Replace indoor or table1 p64 and table outdoor main PCB 2 p65 Is it normal No v Replace the sensor and check If the problem happen again 48 9 3 6 Refrigerant Leakage Detection diagnosis and solution EC Malfunction decision Define the evaporator coil temp T2 of the compressor just starts conditions running as Tcool In the beginning 5 minutes after the compressor starts up if T2 lt Tcool 2 C Tcool 35 6 F does not keep continuous 4 seconds and this situation happens 3 times the display area will show EC and AC will turn off Supposed causes T2 sensor faulty Indoor PCB faulty System problems such as leakage or blocking Trouble shooting Shut off the power supply and tum it on 5 seconds later Is it still displaying the error code Yes Check if T2 sensor is well fixed Correct Yes the installation or replace T2 sensor Does the problem remain again Is there cool air blowing out from indoor air outlet Yes No Y Replace indoor PCB Y Is there any leakage Especially the connection parts such as the Yes gt bes ordre at gas valve and the liquid valve No Y Is there any blocking Such as the capillary or the welded points of the pipes Yes Y Clear the blocking 49 9 3 7 IPM malfunction or IGBT over strong current protection
13. WAY VALVE Rr dM T5 Discharge temp sensor COOLING Compressor d HEATING T3 Condenser temp sensor HEAT EXCHANGE CONDENSER 11 5 Wiring Diagram 5 1 Indoor Unit MWOHCO9S MWOHC12S MWOHC18S 202032891227 SWING MOTOR OPTIONAL OPTIONAL emm HR CNT 1 CNI2 2 OPTIONAL PLASMA DISPLAY BOARD e e ve CH TEMPERATURE Des si Y Ss 64 69 G9 NDOOR UNIT is AIRE THRE SE S ECT OS Sl ow OUTDOOR UNIT INDOOR WIRING DIAGRAM This symbol indicates the element is optional the actual shape shall be prevail 12 MWOHC24S SWING MOTOR 202033091128 gaap OPTIONAL i Swa eiae 3 VERTICAL Ll BOARD merum 1 SWING CAP M P HN LZ 1 2 3 4 1 2 3 4 X Y G RASA Ze e OPTIONAL PONER BOARD E AB wre contr MEE TE DISPLAY BOARD WHITE YELLOW This symbo Indicates the element A g 7 optional he actual shape shal a i 9 be preval T2 pipe T1 room 1 The Color Of Power Supply Cord L N E Measures Up To The IEC Standards BROWN BIUE Y G Or The UL Standards BLACK WHITE GREEN 10 OUTDOOR UNIT 2 The Functions In The Rectangle Are Available For Particular Air condition 3 Connecting CN TIN and CN TO is TRANSFORMER or POWER PCB 13 5 2 Outdoor Unit MROHCO9AS MROHC12AS OPTIONAL EXPANSIVE VALVE 202037590983 6 U 1 BLUE es COMPRESSOR YIG Panda d me cu e m ar b
14. damage failure of product or electric shock e Donotopen the inlet grill of the product during operation Do not touch the electrostatic filter if the unitis so equipped There is risk of physical injury electric shock or product failure e When the product is soaked contact an authorized service center There is risk of fire or electric shock e Be caution that water could not enter the product There is risk of fire electric shock or product damage e Ventilate the product from time to time when operating it together with a stove etc There is risk of fire or electric shock e Turn the main power off when cleaning or maintaining the product There is risk of electric shock e When the product is not be used for a long time disconnect the power supply plug or turn off the breaker There is risk of product damage or failure or unintended operation e Takecare to ensure that nobody could step on or fall onto the outdoor unit This could result in personal injury and product damage CAUTION e Always check for gas refrigerant leakage after installation or repair of product Low refrigerant levels may cause failure of product e Install the drain hose to ensure that water is drained away properly A bad connection may cause water leakage e Keep level even when installing the product It can avoid vibration of water leakage e Do not install the product where the noise or hot air from t
15. in heating operation OPERATION indication lamp This lamp illuminates when the air conditioner is in operation TIMER indication lamp Lights up during Timer operation Temperature indicator Displays the temperature settings when the air conditioner is operational Displays the malfunction code 25 8 3 Main Protection 8 3 1 Three minutes delay at restart for compressor 1 minute delay for the 1 time stand up and 3 minutes delay for others 8 3 2 Temperature protection of compressor top The unit will stop working when the compressor top temp protector cut off and will restart after the compressor top temp protector restart 8 3 3 Temperature protection of compressor discharge When the compressor discharge temp is getting higher the running frequency will be limited as below rules Compressor discharge temp 15 gt 115 C 239 F for 5s compressor stops 108 C 226 F lt T5 lt 115 C 239 F decrease the frequency to the lower level every 3 minutes 90 C 194 F lt T5 lt 105 C 221 F keep running at the current frequency T5 90 C 194 F no limit for frequency 8 3 4 Fan speed is out of control When Indoor fan speed keeps too low 300RPM for certain time the unit will stop and the LED will display the failure 8 3 5 Inverter module protection The Inverter module has a protection function about current voltage and temperature If these protections happen the corresponding code will display on in
16. solution only for 9k 12k models Mi A O Inverter compressor drive error O Clight X Coff x flash 37 9 2 Outdoor unit error display gt MROHCO9AS and MROHC12AS LIGA C OO d j E m a 4 7 Ge d A Ze sc e Sali 2 K m LR DU US coo A E Go ECKE sf I ED301 LED3010n and LED300 off standby LED300 LED301 off and LED300 on running other status error LED100 After power on LED100 Blue color will be slow flash 0 2Hz when the unit is in standby and quick flash 2 5Hz if the unit has some problems Green Red keen po El s primate 108 oversrongcurereon e k po ae hea P O light X Coff x 2 5Hz flash SCT STOT i N 38 gt MROHCI18AS 2023021300584 USE E3 N32 E4 E2 T O a t X X cil cnz o BRI q LZ RED 5 X d f TTE P PE Me Le tof CN28 2 e c BLUE a Z Re ctg y DZ1 po EM O od E BROWN mu Y CN29 R43 de Wk BLUE ch IC40 R217 EE SR Z a Ss WF ul MP 8 l 3 E o SEH 26 L OUT rl e gu g 8 8 T IE LL E 000 OO S Go ME S rs 207 o R214 ae un E2 Geh San 207 U d E202 E207 E R202 vB Dz2 R201 E16 V R2 P ds C20 j E13 34 R205 SE E201 E203 cnis W w J gt
17. 3 rnnned to PM BDARD CNG Status light my which you can Judge the unit Normal or Errar lt HSI 17IV DC isterndioy Flashhg amce per secondilon speed flashing terror Flashing once per half second High speed Flashing feunning amars an o Connect to Electre Expansion Valve INO E 5 Uaaapagq 2404 asjad Aq ASI OWO 2 1 Made FADE asd an ASH ONO C aaa ante ss Cp ASDe HUE uasajan asns ad aq Aal fa N DC FAN PD ER SUPPLY C chet E ada wn H JL nn wx MEN Low VOL supply an 8 Y I T connect to IPM BOARD CMI U bo n a ga 0 0 D D d X 44 3 3YIC Pulse wove 41 631 000 Pulse wave E ML Wis Une CHE S S e HO USE connect to detector 999 CN24 Cua CH19 cms LL Je E ET cos DO roo t p smsor RT cl o 3 plpe ieMp oensoc RT test GU Er E B A S R d g T CN37 rnnned to autOoor OC FA D 3 I 290 3CCV DC lt stondby Exouot P sensor CI 4 3 1 15 17V OC ecce oo n n te ffe mm D OU A D M r em s ARB sees a Si emm RATS Eege HH L Ve U 4 mw nod Leia i dmm Keier T t Gh FERE Ki E n 7 1 ND DE na DTE S gi PE Um E 2 2777 n c H gms cms ol EN e eis gt CNICI OI a EIAS a S UDR A pus jui too E wi e des M caf op perca Get RF Se sg T E ceuli vet CNAI CNI0 n Ee PEU maim in ME gag Di T m TE NDUSE Ba i Ig es IT CHS Sc br Da para RE CHEO WR S E RASE SE H We LT Cu d S B com e EES En pol 2 T CNS Se ra serao L pum E
18. 3 24LC04 c 7 ER ca E e ch 64 A ca vigas 358888 AAA eu Wm 20222222 c2 mal 2410256 nd m RTN Sg E er O L irs Y R46 IC7 car i C58 ct Ez 8 s R58 W mis R72 ULT CNT Ou Iso C43 HN C48 is 7 m 87 C70 O R63 o C3 CN38 C5 Pu Re Fa C55 VE o o _ RSS ROS R81 RES RE 38588 n D o ne Y 11 T Dh RE R110 E24 ompTop MV a ON Pai gu PM 08 _LED2 LED2 on and LED1 off standby LED1 LED2 off and LED1 on running en other status error power light LED4 when power is on LED4 aways on LED3 Flashing once per second low speed flashing standby Flashing once per half second high speed flashing error aways on running standby for normal Operation normally IPM malfunction or IGBT over strong current protection Over voltage or too low voltage protection Inverter compressor drive error Inverter compressor drive error Inverter compressor drive error Over voltage or too low voltage protection O light X Coff x 2 5Hz flash 39 gt MROHC24AS LED standby Flashing once per second low speed flashing error Flashing once per half second high speed flashing running aways on
19. 305 19 5 1 202301300584 temperature sensor sensor assembly Evaporator TEE 1 201532590453 19 6 Wire joint 1 202301450119 assembly Cover of electronic 10 Fan motor cover 1 201132490127 20 1 201132490126 control box Asynchronous i 202400370022 21 Remote Controller 203355091532 motor 12 Bearing holder S 201119900952 zm e 202720090001 Cross flow fan 201100200054 Air freshening filter 201131410703 66 MWOHC12S gt Cie e e e F V es S 7a lt a sz d Y K a ES Ed e ir acm 7 Cn w e ert a i e D TS a mee me T E om s Te c i PB E E D Gg 7 1 Geen xs e Ip E D i a d 4 Bn i Uu S e ui a gt e ig 2 d K ka E e P 1 D i E n ec 2 e 11 d l Le y b c Ka e Bes 2 ed Ba 1 A e Cal 4 AA w 9 ee E Set amp SK D 9 ba a e Nu e 5 EUM vi gt 1 Au DIM ve A T Ei Cv o e rar aed Panel assembly 201132590959 Horizontal louver Air filter 201132590962 Chassis assembly 202400200031 Display box 1 203332390972 16 1 Louver motor 1 assembly Display board l 3 1 1 201332391249 17 Pipe clamp board 1 201119900949 assembly Cover of indoor electronic control 201119900948 Installation plate 201232590037 box E Panel frame assembly Electronic control 1 201132590958 19 1 203332591105 box assembly Electronic control 5 1 Screw cap 2 201119900950 19 1 box 1 201132490125 OX Electroni
20. 31 5 amp 88 7 amp Fmax F8 29 5 amp 85 1j amp 22 0 6 71 6 8 Fmax F6 20 0 6 08 0 8 Fmax F3 Fmax The maximum operation frequency of compressor F1 F8 The detailed value of the compressor operation frequency If users switch on AC by remote controller the compressor will run at the Fmax frequency for 7 minutes according to the outdoor ambient temp During the 7 minutes the frequency limitation is active 7 minutes later the compressor running frequency will be controlled as below T1 Ts 3 56 38 3jB 3 018 37 4 B 2 516 36 5 B 2 018 35 6 B 1 5 amp 34 7 B 1 0 amp 33 8 B 0 5 32 9 B 0 5 amp 31 1 B 1 0 amp 30 2 8 While the zones of A B C are corresponding to different compressor running frequency Note Ta When T1 Ts keeps in the same temp zone for 3 minutes the compressor will run as the below 28 6 82 4 8 rules H A E Increase the frequency to the higher level until to F8 26 8 78 8 B F Keep the current frequency 22 8 71 6 B M G Decrease the frequency to the lower level until to F1 H Run at F1 for 1h if T1 Ts lt 2 C 28 4 F the SE L compressor will stop Meanwhile the compressor running frequency 8 4 2 3 Indoor fan running rules is limited by the current In cooling mode indoor fan runs all the time and the speed can be selected as high medium low aut
21. 5 seconds the compressor will stop until T3 lt 52 C 125 6 F 8 3 10 Evaporator temperature protection T2 lt 0 C 32 F the compressor will stop and restart when T2 5 C 41 F 0 C 32 F T2 lt 4 C 39 2 F the compressor frequency will be limited and decreased to the lower level 4 C 39 2 F sT2s7 C 44 6 F the compressor will keep the current frequency 26 12 gt 7 C 44 6 F the compressor frequency will not be limited 21 8 4 Operation Modes and Functions 8 4 1 Fan mode 1 Outdoor fan and compressor stop 2 Temperature setting function is disabled and no setting temperature is displayed 3 Indoor fan can be set to high med low auto 4 The louver operates same as in cooling mode 5 Auto fan For MWOHCO9S MWOHC12S MWOHC18S models T1 24 amp 75 2 B 6 06 42 8 B H 5 0 amp 41 0 amp 4 0 amp 39 2 amp 2 5 8 36 5 8 1 0 6 33 8 amp or A o H L 0 75 L H L 0 5 L H L 0 25 L N LA O AY or A a an OW e L e For MWOHC24S model ur 27 5 8 81 5 B f qm High 27 0 6 80 6 5 25 5 8 77 9 5 25 0 8 77 0 6 8 4 2 Cooling Mode 8 4 2 1 Compressor running rules The maximum operation frequency of compressor after starting submits to following rule 26 T4 j Fmax F4 45 amp 113j B 43 amp 109 4 B 40 amp 104jB Fmax F7 38 amp 100 4jB
22. 57 299 261 262 264 266 268 270 271 273 275 217 419 280 282 0 62973 0 61148 0 59386 0 57683 0 56038 0 54448 0 52912 0 51426 0 49989 0 486 0 47256 0 45957 0 44699 0 43482 0 42304 0 41164 0 4006 0 38991 0 37956 0 36954 0 35982 0 35042 0 3413 0 33246 0 3239 0 31559 0 30754 0 29974 0 29216 0 28482 0 2777 0 27078 0 26408 0 25757 0 25125 0 24512 0 23916 0 23338 0 22776 0 22231 Appendix 2 Temperature Sensor Resistance Value Table for T5 C K else o fu fs 99 c F kom ro kom ro Kom rar pm que ras ose ar 129 264 266 A ppendix 3 ANTE qn HA TOW 5 3 266 23 734 1274 84 1832 239 26 6 E NETOS E KS E 185 116 2408 4 302 24 05 3 7 KS HE 244 es 83 179 6 eC L x 5 338 26 77 9 E PR ai L 2 788 5 131 LS 25 356 29 806 HEM H3 E l E 87 186 8 116 EE ME ua AEN 1364 EN EIN mE OS 383 a S E 45 392 3X 808 N E RE E E 40 1 MEM 896 62 Gs f AAA GE e T ES E E ENS 8 HE 064 145 4 S os E T 46 ee P ES ES E 8 464 RARE ERES 149 SL mm 0 482 E gt a 80 1004 69 E Ro 58 4 1022 ES E E 13 3 536 NN 304 04 EX SS E iu Z EF 554 4 ER RW SES E E MIT MEN 45 E SES T HE 2192 Z me 6 MEN A 1094 09 4 73 mi EM 7 608 45 NE
23. 7 14 8 57 2B iss 12 amp 53 6 R ce 11 8 51 8 8 7 6 0 amp 42 8jB 5 0 amp 41 0 Fmax F9 Fmax F10 Fmax The maximum operation frequency of compressor F1 F8 The detailed value of the compressor operation frequency If users switch on AC by remote controller the compressor will run at the Fmax frequency for 7 minutes according to outdoor ambient temp During the 7 minutes the frequency limitation is active 7 minutes later the compressor running frequency will be controlled as below 30 T1 Ts 0 5 0 amp 41j amp H 4 5 amp 40 1 B 3 5 6 38 3 5 d 3 0 8 37 4 B F 2 5 8 36 5jB E 2 0 6 35 6 B 1 0 6 33 8jB 0 5 amp 32 9 B A While the zones of A B C are corresponding to different compressor running frequency AT 0 C 32 F as default Note When T1 Ts keeps in the same temp zone for 3 minutes the compressor will run as the below rules A E Increase the frequency to the higher level until to F10 F Keep the current frequency G Decrease the frequency to the lower level until to F1 H Run at F1 for 1h if T1 Ts AT gt 6 C 42 8 F the compressor will stop Meanwhile the compressor running frequency is limited by the current I3HEAT Decrease IZHEAT MHEAT Hold Resume I3HEAT I2HEAT I1 HEAT mean different running current value Off Compressor stops Decrease Decrease
24. 7190115 28 Reactor 1 202301000943 assembly Electronic control 1 203338090316 29 Small Handle 2 201148700009 box assembly Axial flow fan Asynchronous 14 O1 N 18 9 1 Cover of electronic control box 80
25. CH e e L 56 46 11 T7059 082 82 078 78 081 81 086 86 101 101 e 70 59 f 75 63 f 80 67 75 23 89 85 29 44 95 35 105 40 56 115 46 11 63 Heating Chart 57 53 47 43 37 33 27 23 17 13 Ce EE E BAR 75 57 53 47 43 37 33 27 23 17 13 C a 89 11 ae 33 6 11 78 0 2 8 33 10 56 PSI OO 302 m HT 435 339 57 53 47 43 37 33 27 23 17 13 Ls 13 89 11 67 8 33 6 11 2 78 0 56 2 78 5 8 33 10 56 AO 57 53 47 43 37 33 27 23 17 13 13 89 11 67 8 33 6 11 2 78 0 56 2 78 5 8 33 10 56 64 10 Exploded View Version of 2013 07 19 10 1 Indoor unit MWOHCO9S Accessory part Panel assembly 201132590959 Horizontal louver Air filter 201132590962 16 Chassis assembly Display box 203332390972 16 1 Louver motor assembly Display board 201332391249 Pipe clamp board assembly DH D Cover of indoor 4 electronic control 1 201119900948 1 Installation plate 1 box D D e 5 1 1 T 8 Panel frame Electronic control 1 201132590958 19 assembly box assembly Electronic control Screw cap 2 201119900950 19 1 box Electronic control Drain hose 1 201101020038 19 box II Main control board Pipe nut 1 201600330002 19 3 1 assembly 65 Ambient 7 Pipe nut 1 201600330001 19 4 temperature sensor 1 202433190000 assembly Fix clamp of Pipe temperature 1 201102000
26. DOR UNIT POWER SUPPLY d CNS CNI CN2 YELLOW REACTOR R6025 ORANGE ORANGE REACTOR R1815 RED E B RED ORANGE d I E Lei vyerow CAPACITOR OUTDOOR WIRING DIAGRAM MROHCO9AS MROHC12AS Rectlfler Input Voltage Rectifler output Voltage the same as power supply 290 330V DC standby current transformer 208 230V AC 250 350V DC Running CNI4 connect to the eorth 202302130906 a k FUSE M SAO OX e D T20AL 250VAC x gt Tm ta R CNS CN9 3 PFC TERMINAL ENIO connect to REACTER CNH 0 5 0 8V ACCstandly Eee 5 50V AC running connect to the 4 WAY a when 4 woy Is EN output 208 230VAC nv A D El CN4 CN7 CNS CN6 5 connect to heater ET Vi CH x when heater Is EIN output 208 230VAC E Wi SR D FaAN U gas m CN400 e connect to outdoor DC FAN e he A E a e e 0VAC standby ii s mma 50 200VAC running e AAA n FA W j q e pe DUM dis ai wi L ss 5 4 1 a d da a connect to the compressor Ba 6 LE ML ovac standby B m e 10 200VAC amp runnlng L m s Fe ma E E mad 4 R 3 U qu E 1 e E db see ob Em ke E La a H E a a E D e b T E rat q R e I hon G y C ka LE ta E a TF SS EB e ep a n m L 4 p ul a T HA _ a E D e L y d a a a 5 8 7 D L e 7 Y CNI04 CN101
27. EME ETT TEE 8 9 2 OU OO AINEs Rs sere ne bte Se a ns caen dd 10 4 Refrigerant Cycle Diagramme sn Kee 11 E KEE DIE Lo LES APR ER TE 12 Mises AO q PEER PP RER O 12 A EP 14 GC Installation Deal Sorrir AN I UEM 19 6 1 Wrench torque sheet for installation see ee ee 19 6 2 Connecting Bue el 19 6 3 PIpe length and the ele VAMO a pax ede Eve do paia ii e a Rr a da e 19 6 4 Installation for the first me 20 6 5 Adding the refrigerant after running the system for many years ccccccccccnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnns 21 6 6 Re installation while the indoor unit need to be repaired eee eee ee 21 6 7 Re installation while the outdoor unit need to be repaired sss sees 22 Operation Characteris His nn dd 24 m Electronic FUNCION arc E x cS 25 S IP 16 0 C 3 e aate ant dia 25 9 2 Bre TUMGHOM EE 25 E TUN Ee te WEE 26 8 4 Operation Modes and FUNCTIONS sisi 28 St TFOUDICS Le Le a Lo HHH 36 9 1 Indoor e ire e RE EE 37 9 2 O tdoor ILE OT display noria td do itane IAS 38 9 9 Dlagnosis a d SO TOM ula 41 TO Exploded VIEW ui aa 65 RIO plo eLo HI A On a a EE 65 102 QUIGOOF ilg URP 73 11 Disassembly INS TUCHON Sita iia 81 A door uneer A iaa 81 TZ eles e a n ii ec od De 85 1 Precaution 1 1 Safety Precaution e To prevent injury to the user or other people and property damage the following instructions must be followed e Incorrect operation due to ignoring instruction will cause harm or damage o Before se
28. MWOHC24S pos 2 56 o mos 10 8in 10 8in 1 8in jeu 3 2 Outdoor Unit More than 30cm 11 8in SK SIA IS gt f HAS More than 60cm 23 6in SSS SESS Service space YE MOM More than 30cm 11 8in A ad Ke al no o MW S w a d x v More than 60cm 23 6in More than 70cm 27 6in Alr inlet Air SEN Wi Note The above EMEN is T for reference The a of _ units sa be T I E MROHCO9AS 760mm 285mm 590mm 823mm 530mm 290mm MROHC12AS 29 9in 11 2in 23 2in 32 4in 20 9in 11 4in 845mm 320mm 700mm 908mm 560mm 335mm 33 3in 12 6in 27 6in 35 7in 22 0in 13 2in MROHC24AS SOIN SN SEI SEN een Ses 36 7in 12 9in 35 1in 40in 24 1in 13 6in 10 4 Refrigerant Cycle Diagram INDOOR OUTDOOR Electronic CAPILIARY TUBE expansion valve CAPILIARY TUBE SJ 0080 LIQUID SIDE de DUDUDU gt 2 WAY VALVE HEAT EXCHANGE EVAPORATOR T1 Room temp sensor T2 Evaporator temp sensor gt d NY GAS SIDE KE 1 WAY VALVE Accumulator T4 Ambient temp sensor d i E Es
29. Model Numbers MWOHCO9S MROHCO9AS MWOHC12S MROHC12AS MWOHC18S MROHC18AS MWOHC24S MROHC24AS Table of Contents Precaution Part Names And Functions Dimension Refrigerant Cycle Diagram Wiring Diagram Installation Details Operation Characteristics Electronic Function Pn See er I o Troubleshooting _ Exploded View Zu ered CERTIFIED esch Disassembly Instructions ENERGY STAR Intertek WARNING e Installation MUST conform with local building codes or in the absence of local codes with the National Electrical Code NFPA70 ANSI C1 1993 or current edition and Canadian Electrical Code Part1 CSA C 22 1 e The information contained in the manual is intended for use by a qualified service technician familiar with safety procedures and equipped with the proper tools and test instruments e Installation or repairs made by unqualified persons can result in hazards to you and others e Failure to carefully read and follow all instructions in this manual can result in equipment malfunction property damage personal injury and or death e This service is only for service engineer to use AIR CONDITIONERS CONTENTS T2 OG AUN CIO I E 1 1 Satety PRECAUTION Net 1 MZ VV A PPP AN 1 2 Part Names And FUNGCUONS eenegen gege EES EE 4 2 1 Model Names of Indoor Outdoor units ss 4 2 2 Part names of Indoor Outdoor units iii 4 2 3 Functions of Indoor Outdoor untts sise 5 Ss DIO SION EE 8 SM nere M
30. Pipe length and the elevation ES 3 8in 1 4in MWOHCO9S MROHCO9AS 69 52mm 66 35mm 1 2in 1 4in MWOHC12S MROHC12AS 612 7mm 66 35mm 1 2in MWOHC18S MROHC18AS 612 7mm 5 8in 3 8in MWOHC24S MROHC24AS d15 9mm Max Standard Max Additional Length length Elevation refrigerant A Om 25m 15g m 32 8ft 82 0ft 0 160z ft Om 25m 15g m 32 8ft 82 0ft 0 160z ft Om eft 5m Oft 69 52mm MWOHCO9S MROHCO9AS 1 1 MWOHC12S MROHC12AS 2 30m 15g m MWOHC18S MROHC18AS 65 6ft 98 4ft 0 160z ft 2 50m 30g m 82 0ft 164ft 0 320z ft MWOHC24S MROHC24AS 19 6 4 Installation for the first time Air and moisture in the refrigerant system have undesirable effects as below Pressure in the system rises Operating current rises Cooling or heating efficiency drops Moisture in the refrigerant circuit may freeze and block capillary tubing Water may lead to corrosion of parts in the refrigerant system Therefore the indoor units and the pipes between indoor and outdoor units must be leak tested and evacuated to remove gas and moisture from the system Gas leak check Soap water method Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor unit connections by a soft brush to check for leakage of the connecting points of the piping If bubbles come out the pipes have leakage 1 Air purging with vacuum pump Indoor uniti Outdoor uni
31. T s ce 24 L m oun ge Ambient Electronic control 1 temperature sensor 1 202301310075 1 203337890332 box assembly assembly 2011481G000 Terminal board 2 Rear net 1 1 203337990161 assembly Condenser 3 1 201537890068 21 1 Wire joint 202301400256 assembly Pipetemperatue temperature 202440500004 21 2 Terminal board 201237890064 sensor assembly Liquid valve Valve plate 201237300285 22 201637891245 assembly S Chassis assembly 201257090054 Liquid valve 201600700078 Rear right Electronic clapboard 1 201237890100 22 2 expansion valve 201601300554 assembly assembly 4 way valve Big handle 1 201237390104 23 1 201637891247 assembly 1 9 Water collector 201137390017 201600720194 Front right clapboard 1 201248100389 23 2 4 Ways valve 1 201600690011 assembly 7 Front panel Air outlet grille m mem Crankcase 25 1 202403100501 electric heater 201237890112 Asynchronous 202400300033 motor Supporter Cover of 27 1 201248090001 inductance 28 1 202301000820 Rear supporter 1 201248100384 28 Top cover assembly 201248100363 Left supporter 201248100367 Partition board 19 1 201237790031 assembly assembly of fan 201257090031 Discharge 13 Axial flow fan 1 201145500002 26 temperature 1 202301310068 sensor assembly 202301000819 30 Clamp of front net 201135110801 Capacitor of 31 1 202401000078 compressor 32 Capacitor clip 1 201200100002
32. UEN 112 LE 163 4 Z AB 8 626 46 RCE 13 75 m TE H EE 9 844 EPA 148 14 8 76 ES 3 KS o FE 20 66 2 48 1166 16 6 CT Y KS E 62 4 M84 TB EINE ri E 50 120 2 79 E S s 79 1742 742 SC q Fais a e 228 2 e m 2 L 282 2 233 6 ar 143 Lm w s m s nef ne ns we 24 60 2 Compressor checking Measure the resistance value of each winding by using the tester Input Terminal Blue Blue q Red 2 Black Black 3 Red Position ResistanceValue SR RECHERCHER H 0 80 1 770 0 550 20 C 68 F 20 C 68 F 20 C 68 F 61 3 IPM continuity check Turn off the power let the large capacity electrolytic capacitors discharge completely and dismount the IPM Use a digital tester to measure the resistance between P and UVWN ul MEA and N a tester Normal resistance value EIL tester Normal resistance value SS 4 Indoor AC Fan Motor Measure the resistance value of each winding by using the tester Input Terminal Red Red 1 Black 2 White White 3 Black Position Resistance Value Black Red 100 50 8 1000 8 20 C 68 F 20 C 68 F Brand Weiling Brand Dayang White Black 64 50 8 68 50 8 20 C 68 F 20 C 68 F Brand Weiling Brand Dayang 62 ES 75 85 95 105 115 KS 23 89 29 44 35 40 56 46 11 105 115 ge d E d be L a 7 70 59 119 L ie META 105 115 Lem e E
33. a cneq amp D MO USE ENIE E Al Jl E FE connect to the conperssor top temp sensor on Jum Seet me XE ge it Cue E L 1 a ZC ER current transformer gro SE act PA op ms CNS 5 RES E ee s pri f AG ES A DS connect a IPN FOART Gia Be Le T T TI conect to the EnrthlOptional cross the current transformer L BUT SL OWT N OWT EUB E3UV AL E j Og ne E cne ll cu e connect ta Pe RO E connect to IPN BOARD CA M OUT SL OLTI N OUT 208 240 AC r AWAY CHE ear FUSEL TSA EaU VAC FUSES TEAL 690 AE CNSIL IN CNS UMACN IPDA UNSH power supply 208 2d0w AC connect to the terminal CM1 CME teomtraled by BY relayer Ehb CN3 controled ly RYJ rglayer connect to the 4 WAY CMS CMB contruled ky RTA reloper when 4 may 5 ON output BDB E3DVAC comect to the heater when heater ls ON output 208 290 AC P 1 11DI rnnned to the eorth 18 6 Installation Details 6 1 Wrench torque sheet for installation Additional tightening Outside diameter torque 4500N cm 459kgf cm E io 6500N cm 663kgf cm 6700N cm 683kgf cm 6 2 Connecting the cables The power cord should be selected according to the following specifications sheet 0 The cable size and the current of the fuse or switch are determined by the maximum current indicated on the nameplate which located on the side panel of the unit Please refer to the nameplate before selecting the cable fuse and switch 6 3
34. ar m m em em een gem ve Jeng E RA R oprIoNAL i i l i HEATER HEATER 2 mii HR e eg e A HEAT EXCHANGER AMBIENT SENSOR DISCHARGE SENSOR SENSOR l GREEN OLP TEMP SENSOR RAE IL orina i El OUTDOOR MAIN PCB LA A G OUTDOOR REACTOR FAN R1005 R20035 OPTIONAL A Gm edd OUTDOOR WIRING DIAGRAM 14 Note according to different terminals GND can be connected i l l in different ways ECC Ferererereise Jit exo Ba ear be ba pe mie wee eg Re Ewe E santa i YIG eke INDOOR UNIT l MROHC18AS J E 202037890705 DISCHARGE SENSOR OPTIONAL s E Jorge sensor OPTIONAL 6 i OPTIONAL Y G d BLUE x YELLOW RED LE iE e Dip Tie BROWN II UU UE LS 5 Li Le L1 essea amp COMPRESSOR POWER SUPPLY WIG j G Eas GD S o OPTIONAL HEATER zd e YELLOW 2 ORANGE REACTOR1 R1815 l HEATER 1 27 R1310 OUTDOOR K wo LES S RED i ORANGE i O OUTDOOR WIRING DIAGRAM CAPACITOR YELLOW 15 MROHC24AS 202038090851 o MEE E O 1 Only being used HEAT EXCHAMGER SENSOR OPTIONAL HEATER A AMB ENT SENSOR L x na aller sales LEL Lose E GE m HEATER 2 maintenance BLACK WHITE gt ET a HEATER RS exa 5S 0200 OUTDOOR MA IN EG YG 51 81 ELA E L1 L2 S Li 12 q5ielelelelel La La 8 Compressor TO ND
35. ation Drying operation gt 17 C lt 30 C gt 10 C Room temperature o o o 62 F 86 F 50 F 0 C 50 C 32 F 122 F ABC 50 C 15 C 30 C 0 C 50 C 5 F 122 F 5 F 86 F 32 F 122 F For the models with Outdoor temperature low temperature cooling system aren TT 21 CAUTION 1 If the air conditioner is used beyond the above conditions certain safety protection features may come into operation and cause the unit to operate abnormally 2 The room relative humidity should be less than 8096 If the air conditioner operates beyond this figure the surface of the air conditioner may attract condensation Please set the vertical air flow louver to its maximum angle vertically to the floor and set HIGH fan mode 3 The optimum performance will be achieved during this operating temperature zone 24 8 Electronic Function 8 1 Abbreviation 11 Indoor room temperature T2 Coil temperature of evaporator T3 Coil temperature of condenser T4 Outdoor ambient temperature T5 Compressor discharge temperature 8 2 Display function 8 2 1 Icon explanation on indoor display board Signal receiver too Bg ION indication lamp optional function This lamp illuminates when Clean Air feature is activated DEFROST indication lamp For cooling amp heating models only Lights up when the air conditioner starts defrosting automatically or when the warm air control feature is activated
36. ay valves are set to the opened position Remove the valve stem caps and confirm that the valve stems are in the opened position Be sure to use a hexagonal wrench to operate the valve stems 2 Connect the charge hose with the push pin of handle lo to the 3 way valves gas service port 3 Air purging of the charge hose Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and then close it quickly 4 Set the 2 way valve to the close position 5 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0 1Mpa 14 5Psi 6 Set the 3 way valve to the closed position immediately Do this quickly so that the gauge ends up indicating 0 3Mpa 43 5Psi to 0 5 Mpa 72 5Psi Disconnect the charge set and tighten the 2 way and 3 way valve s stem nuts Use a torque wrench to tighten the 3 way valves service port cap to a torque of 18N m Be sure to check for gas leakage 2 Air purging by the refrigerant Procedure 1 Confirm that both the 2 way and 3 way valves are set to the closed position 2 Connect the charge set and a charging cylinder to the service port of the 3 way valve Leave the valve on the charging cylinder closed 3 Air purging Open the valves on the charging cylinder and the charge set Purge the air by loosening the flare nut on the 2 way valve approximately 45 for 3 seconds then closing it for 1 minute repeat 3 times A
37. c control Drain hose 1 201101020038 19 2 ne 1 201132490139 OX Main control board T Pipe nut 1 201600330003 19 3 1 201332591013 assembly Ambient T Pipe nut 1 201600330001 19 4 1 202433190000 assembly temperature sensor Fix clamp of Pipe temperature 1 201102000305 19 5 1 202301300584 temperature sensor sensor assembly 67 Evaporator UM 1 201532590458 19 6 Wire joint 1 202301450119 assembly Cover of electronic 10 Fan motor cover 1 201132490127 20 1 201132490126 control box Asynchronous 11 1 202400370022 21 Remote Controller 1 203355091532 motor Bearing holder 201119900952 202720090001 Cross flow fan 201100200054 Air freshening filter 201131410703 68 MWOHC18S ONLY FOR STANDARD BOM CUSTOMIZED FEATURE MAY CHANGE THE PART LIST Accessory part Es tr Panel assembly 201132890674 Bearing holder Display box Cross flow fan assembly Display board 201332391249 18 Chassis assembly assembly D D Cover of indoor electronic control 1 201133091048 Pipe clamp board 1 bo D D 1 203332390972 1 Panel frame 1 201132890673 2 Installation plate assembly Electronic control Screw cap 3 201119900950 2 box assembly m 201132890671 Electronic control Air outlet assembly 1 201132890677 2 b OX 1 Main control board Louver motor 1 202400200120 21 3 1 assembly 69 1 2 15 1 17 9 0 1 1 1 1 Ambient Drain hose 201101020038 21 5 temperature sen
38. defrosting mode Indoor fan breeze 10s n No matter what value T4 is if the machine S 10s runs with T3 lt 3 C 37 4 F for more than 120 LEE minutes and T3 keeps lower than no longer than 10m 309 TCDI 4 C 39 2 F for more than 3 minutes the machine will enter defrosting mode no matter if XX 90 T2 drops more than 5 C 41 F or not Condition of ending defrosting 8 4 3 5 Evaporator coil temperature If any one of the following items is satisfied the protection defrosting will finish and the machine will turn to T2 gt TEH2 C the compressor running normal heating mode frequency decreases to the lower level and T3 rises to be higher than TCDE1 C runs for 20s 3 keeps to be higher than TCDE2 C for 80 When the frequency decreases to F2 and the seconds T2 is still over TEH2 C for 3 minutes the he machine has run for 10 minutes in compressor will stop defrosting mode T2 48 C 118 4 F or T2 stays in Defrosting action 48 C 118 4 F TEH2 C for 6 minutes the 32 frequency will not be limited by T2 2260 C 140 F the compressor will stop and restart when T2 lt 48 C 118 4 F 8 4 4 Auto mode This mode can be chosen with remote controller and the setting temperature can be changed between 17 C 62 6 F 30 C 86 F In auto mode the machine will choose cooling heating or fan only mode according to AT AT T1 Ts AT T1 Ts AT gt 1 C 33 8 F not resume until room temperature
39. diagnosis and solution P0 Pi m Malfunction decision When the voltage signal that IPM send to compressor drive chip conditions is abnormal the display LED will show P0 and AC will turn off Supposed causes Wiring mistake IPM malfunction Outdoor fan ass y faulty Compressor malfunction Outdoor PCB faulty Trouble shooting Check if the wiring between main PCB and compressor connected by Yes E Correct the connection or replace the error and H the wires and connectors wires and connectors are broken No IPM continuity check Check if the Replace the IPM board or replace the IPM terminal resistance values are No gt main PCB if the IPM board and main uniform Refer to page 64 PCB are integrated together Yes v Check if the outdoor fan runs Nu proper ar the outdoor uni Mi a ventilation Is good bas Yes Check If the compressor resistance values are uniform Refer to page 63 S A A RT Yes v Replace the outdoor main PCB if the main PCB and IPM ara separate 90 Take the 9k model as example sm d o ANNA em 4 vn 555 LEE L R A o T pep CTO DW CELEER 91 K m a roe NE raro SS es EELE iE S a WU am O y tai DOT TE AREA E 3 P v i ER s Ten ed ef 2 Es 7 gt v N E d Y i KI gn wee o M PY A dd a ge O a gt 1 o
40. door unit and the unit will stop working 8 3 6 Indoor fan delayed open function When the unit starts up the louver will be active immediately and the indoor fan will open 10s later If the unit runs in heating mode the indoor fan will be also controlled by anti cold wind function 8 3 7 Compressor preheating functions Preheating permitting condition If T4 outdoor ambient temperature 3 C 37 4 F and the machine connects to power supply newly or if T4 lt 3 C 37 4 F and compressor has stopped for over 3 hours the compressor heating cable will work Preheating mode A weak current flow through the coil of compressor from the wiring terminal of the compressor then the compressor is heated without operation Preheating release condition If T4 gt 5 C 41 F or the compressor starts running the preheating function will stop 8 3 8 Zero crossing detection error protection If AC detects time interval is not correct for continuous 240s the unit will stop and the LED will display the failure The correct zero crossing signal time interval should be between 6 13ms 8 3 9 Condenser temperature protection 55 C 131 F lt T3 lt 60 C 140 F the compressor frequency will decrease to the lower level until to F1 and then runs at F1 If T3 lt 54 C 129 2 F the compressor will keep running at the current frequency 3 52 C 125 6 F the compressor will not limit the frequency and resume to the former frequency 3260 C 140 F for
41. e DC voltage between P and N port The normal value should be around 310V 9 3 9 High temperature protection of compressor top diagnosis and solution P2 Error Code Malfunction decision If the sampling voltage is not 5V the LED will display the failure conditions Supposed causes e Powersupply problems e System leakage or block e PCBfaulty Trouble shooting Check if the air fiow system Clear up the air inlet and outlet or the heat of indoor and outdoor units Yee anger of i nds units are obstructed exch ndoor utdoor No Y Turn off the power supply and tum it on 10 minutes later Yes Check i y Check if all the connection especially Tum No the connection of OLP Over Load No Correct the connection bicho Protector sensor is good Yes T Measure the resistance between the two parts of No gt Replace the OLP Check if the refrigerant the OLP Is it zero charge volume is normal E Yes d Replace the outdoor control PCB Yes No q Recharge the correct refrigerant volume Refrigerant system is blocked such as capillary or welded point of pipes 99 9 3 10 Inverter compressor drive error diagnosis and solution P4 Mor Malfunction decision An abnormal inverter compressor drive is detected by a special conditions detection circuit including co
42. e Use afirm stool or ladder when cleaning or maintaining the product Be careful and avoid personal injury e Replace the all batteries in the remote control with new ones of the same type Do not mix old and new batteries or different types of batteries There is risk of fire or explosion e Do not recharge or disassemble the batteries Do not dispose of batteries in a fire They may burn of explode e If the liquid from the batteries gets onto your skin or clothes wash it well with clean water Do not use the remote of the batteries have leaked 2 Part Names And Functions 2 1 Model Names of Indoor Outdoor units ELM DER ZE DEE MWOHCO9S MROHCO9AS se MWOHC12S E Inverter MWOHC18S MROHC18AS MWOHC24S MROHC24AS 2 2 Part names of Indoor Outdoor units 2 3m or more 4 s OD kh o E ke o LS FT gt Je Oe SCH Te o Ge i i 3 S P A T d ro Pg if i i j i e i i y N A Al HE pg bn e c o ed y y A i i fer Ai d 2 3 Functions of Indoor Outdoor units Filter Cold catalyst filter m lonizer O 4 Plasma O Silver Ico Filter O m Vitamin C Filter O 3M HAM Filter O Bio Filter O 4 Golden Fin O Self Clean O Follow Me O _ 1W Standby
43. e nut of the 3 way valves about 45 counterclockwise for 6 or 7seconds after the gas coming out then tighten the flare nut again Make sure the pressure display in the pressure indicator is a little higher than the atmosphere pressure Then remove the charge hose from the 3 way valve 8 Fully open the 2 way valve and 3 way valve and securely tighten the cap of the 3 way valve 2 Air purging by refrigerant Procedure 1 Confirm that both the 2 way and 3 way valves are set to the closed position 2 Connect the charge set and a charging cylinder to the service port of the 3 way valve 3 Air purging Open the valves on the charging cylinder and the charge set Purge the air by loosening the flare nut on the 2 way valve approximately 45 for 3 seconds then closing itfor 1 minute repeat 3 times After purging the air use a torque wrench to tighten the flare nut on the 2 way valve 4 Check the gas leakage Check the flare connections for gas leakage 5 Discharge the refrigerant Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2 way valve approximately 45 until the gauge indicates 0 3Mpa 43 5Psi to 0 5 Mpa 72 5Psi 6 Disconnect the charge set and the charging cylinder and set the 2 way and 3 way valves to the open position Be sure to use a hexagonal wrench to operate the valve stems 7 Mount the valve stems nuts and the service port cap Be s
44. eakage detect The refrigerant leakage detect function can better prevent the compressor being damaged by refrigerant leakage or compressor overload e Self diagnostic Function Monitoring some abnormal operations or parts failures microcomputer of the air conditioner will switch off 6 and protect the system automatically Meanwhile the error or protection code will be displayed on the indoor unit e PTC heating belt With a PTC heating belt fitted on the base plate of the outdoor unit the rain snow or defrosted water accumulating on the base plate is avoided e Compressor crankcase heater The oil dissolves easily in refrigerant especially in low temperature condition The crankcase heating belt can heat the bottom of the compressor to avoid pumping out too much oil with the refrigerant which helps to protect the compressor 3 Dimension 3 1 Indoor Unit MWOHCO9S 835mm MWOHC12S 32 9in 990mm MWOHC18S menes 39 0in MWOHC24S FIOI 46 7in D 198mm 7 8in 218mm 8 6in 258mm 10 2in H 280mm 11 0in 315mm 12 4in 340mm 13 4in MWOHCO9S 140mm 110mm 45mm P65mm 2 56in MWOHCI2S 5 5in 4 3in 1 8in Maiel L R 260mm 135mm MWOHC18S oce 10 2in 5 3in Dimension of installation hole 275mm 275mm 45mm
45. emperature sensor assembly Rear net Condenser assembly Pipe temperature sensor assembly T BE Jemi EBE 1237590091 H SC 201237590080 o Water collector 201137400000 4 Ways valve 201600690010 6 Chassis Chassis assembly Po right clapboard assembly 202301300115 17 2011374G000 1 18 3 201537690004 1 m 202440600004 20 19 BOM Code Left supporter 1 201237400400 Top cover assembly 201237900028 Electronic control 203337590101 box assembly T board EISES 203887500049 assembly 202301400256 EE 237590046 201637591413 Terminalboard board 4 VVays Valve assembly Liquid valve Air outlet grille 201237390105 22 201637391145 assembly 1 Clamp of front net E 201135110801 Liquid valve rr EE 201600740523 Electronic Front panel 201237400392 22 2 expansion valve 201601300554 assembly 8 Axinowien 1 201100390002 1 201400601810 Asynchronous Crankcase electric 202400300060 24 202403100501 motor heater Supporter Discharge assembly of fan 1 201237390026 25 temperature sensor 1 202301310068 motor assembly Partition board 16 1 201237500259 27 Reactor 1 202301000867 assembly 76 MROHC18AS E e 1 17 e 16 15 3 1 13 ER a v E SL i D 4 E e e 31 f UM e 22 2 E 7 Y F ge 23 2 gt q E el 32 Pus d q R 20 12e q fe 23 0767 21 E d Sis re e21 1 i e 19 e221 le L
46. essor running frequency will keep lower than F2 and the indoor unit will bring faint breeze which will reduce the noise to the lowest level and create a quiet and comfortable room for you 9 Troubleshooting Safety Electricity power is still kept in capacitors even the power supply is shut off Do not forget to discharge the electricity power in capacitor Electrolytic Capacitors HIGH VOLTAGE CAUTION For other models please connect discharge resistance approx 1000 40W or soldering iron plug between terminals of the electrolytic capacitor on the contrary side of the outdoor PCB Discharging position Discharging period 10 seconds or more Plug of 4 soldering IIE iron AJA Note The picture above is only for reference The plug of your side may be different 36 9 1 Indoor Unit Error Display an Et indoor outdoor units communication error Cre a 7 i 74 a circuit mme ox e a o o ooo short circuit T mes T ms x EC Refrigerant leakage detection X 2 times F1 Gwa amem temperature sensor T4 open circuit or short circuit Xx 3 times F2 SE coil temperature sensor T3 open circuit or short circuit xx 4 times F3 compressor EE Ee temperature sensor T5 open circuit or short circuit Stmes O F4 Outdoor unit EEPROM parameter error 6tmes o F5 Outdoor fan speed has been outof contol Kee KEREN High temperature protection of compressor top diagnosis and
47. exceeds 12 C 53 6 F 8 4 5 4 Evaporator anti freezing protection condenser high temperature protection and outdoor unit frequency limit are active and the same as that in cooling mode 8 4 5 5 The outdoor fan operates the same as in cooling mode 8 4 6 Forced operation function 8 4 6 1 Enter forced operation function When the machine is off pressing the touch s button will carry the machine to forced auto mode If pressing the button once again within 1 C 30 2 F lt ATS1 C 33 8 F 5 seconds the machine will turn into forced AT lt 1 C 30 2 F Indoor fan will run at auto fan of the relevant mode The louver operates same as in relevant mode If the machine switches mode between heating and cooling the compressor will keep stopping for 15 minutes and then choose mode according to T 1 Ts If the setting temperature is modified the machine will choose running function again 8 4 5 Drying mode 8 4 5 1 Indoor fan speed is fixed at breeze and can t be changed The louver angle is the same as in cooling mode 8 4 5 2 Compressor running rules T1 Ts 2 5 amp 36 5 B 2 0 amp 35 6 B 1 5 amp 34 7 B F2 1 0 amp 33 8 B 0 5 amp 32 9 B F1 0 0 amp 32 0 amp F1 8 4 5 3 Low indoor room temperature protection In drying mode if room temperature is lower than 10 C 50 F the compressor will stop and cooling mode In forced auto forced c
48. fter purging the air use a torque wrench to tighten the flare nut on the 2 way valve 4 Check the gas leakage Check the flare connections for gas leakage 5 Discharge the refrigerant Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2 way valve approximately 45 until the gauge indicates 0 3Mpa 43 5Psi to 0 5 Mpa 72 5Psi 6 Disconnect the charge set and the charging cylinder and set the 2 way and 3 way valves to the open position Be sure to use a hexagonal wrench to operate the valve stems 7 Mount the valve stems nuts and the service port cap Be sure to use a torque wrench to tighten the service port cap to a torque 18N m Be sure to check the gas leakage 6 7 Re installation while the outdoor unit need to be repaired 1 Evacuation for the whole system Procedure 1 Confirm that both the 2 way and 3 way valves are set to the opened position 2 Connect the vacuum pump to 3 way valve s service port 3 Evacuation for approximately one hour Confirm that the compound meter indicates 0 1Mpa 14 5Psi 4 Close the valve Low side on the charge set turn off the vacuum pump and confirm that the gauge needle does not move approximately 5 minutes after turning off the vacuum pump 5 Disconnect the charge hose from the vacuum pump to check for gas leakage 2 Refrigerant charging f indor Y EAS Lagi ado t Procedure
49. he outdoor unit could damage the neighborhoods It may cause a problem for your neighbors e Use two or more people to lift and transport the product e Do not install the product where it will be exposed to sea wind salt spray directly It may cause corrosion on the product Corrosion particularly on the condenser and evaporator fins could cause product malfunction or inefficient operation Operational e Do not expose the skin directly to cool air for long time Do not sit in the draft e Do not use the product for special purposes such as preserving foods works of art etc It is a consumer air conditioner not a precision refrigerant system There is risk of damage or loss of property e Do not block the inlet or outlet of air flow e Use a soft cloth to clean Do not use harsh detergents solvents etc There is risk of fire electric shock or damage to the plastic parts of the product e Do not touch the metal parts of the product when removing the air filter They are very sharp e Do not step on or put anything on the product outdoor units e Always insert the filter securely Clean the filter every two weeks or more often if necessary A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage e Do not insert hands or other objects through air inlet or outlet while the product is operated e Do not drink the water drained from the product
50. ision When indoor fan speed keeps too low 300RPM for certain time conditions the unit will stop and the LED will display the failure Supposed causes Wiring mistake Fan ass y faulty Fan motor faulty PCB faulty Trouble shooting shut off the power supply and tum it on 5 seconds No later Is If still displaying the error code gt The unit operates normally Yes y Find out the cause and shut off the power supply have it pausa For rotate the fan by hand No Gxample check Does it rotate properly whether the fan is blocked or the bearing is broken Yes Check the wires of fan motor Are all the No Correct tha connections connections good Yes Y If the Check whether the fan matfunction is motor Is normal through No fan 4 still existing index 1 replace the A A maln PCB No Yes Replace the Check whether the main PCB is dic normal through index 2 No The malfunction is solved Yes 45 Index 1 1 Indoor or Outdoor DC Fan Motor control chip is in fan motor Measure the resistance value of each winding by using the tester If any resistance value is zero the fan motor must has problems and need to be replaced Red Black White Yellow Blue Index2 1 Indoor or Outdoor DC Fan Motor control chip is in fan motor Power on and when the unit is in standby mea
51. ly memory whose contents can be erased and reprogrammed using a pulsed voltage For the location of EEPROM chip please refer to the below photos B 41 9 3 2 Indoor outdoor unit s communication diagnosis and solution E1 d DAE Malfunction decision Indoor unit does not receive the feedback from outdoor unit during conditions 110 seconds and this condition happens four times continuously Supposed causes e Wiring mistake e Indoor or outdoor PCB faulty Trouble shooting Power off then turn on the unit 5 seconds later reconnect the power wire Is the error still displaying after several minutes Yes Y Measure Vs is it moving alternately with positive value Vs is the voltage between L2 and S of outdoor unit Connect the red pin of multimeter with L2 port black pin with S port No Yes v Check all the wiring with outdoor units Is the wiring to the outdoor main PCB connected correctly Is the reactor connected well Yes Y Y Measure the resistance of the reactor The one without capacitor If it is zero follow the below step If not replace a new reactor Check all the wiring with indoor units Is the wiring to the indoor main PCB connected correctly Yes Replace the outdoor main PCB Replace the indoor main PCB Power on Is the error extinguished Power on Is the erro
52. mmunication signal detection voltage detection compressor rotation speed signal detection and so on Supposed causes Wiring mistake IPM malfunction Outdoor fan ass y faulty Compressor malfunction Outdoor PCB faulty Trouble shooting Check H the wiring between main PCB and compressor connected by Yes E Correct the connection or replace the error and if the wires and connectors wires and connectors are broken IPM continulty check Check if the Replace the IPM board or replace the IPM terminal resistance values are No main PCB if the IPM board and main uniform Refer to page 64 PCB are integrated together Yes Y Check if the outdoor fan runs property or the outdoor unit No Please fan speed ventilation ls good Yes Check if tha compressor resistance values are unitorm Refer to paga 63 No d Replace the compressor Yes v Replace the outdoor main PCB if the main PCB and IPM ara separate 96 Main parts check 1 Temperature sensor checking Disconnect the temperature sensor from PCB measure the resistance value with a tester Le Weg Tester Temperature sensors Room temp T1 sensor Indoor coil temp T2 sensor Outdoor coil temp T3 sensor Outdoor ambient temp T4 sensor Compressor discharge temp T5 sensor Measure the resistance value of each winding by using the multi meter of Appendix
53. o and silent mode When the compressor is running the indoor fan is IBCOOL en controlled as below Decrease For MWOHCO9S MWOHC1 25 COOL MWOHC18S models gag COOL gs Resume ISCOOL 12COOL I1COOL mean different running current value Off Compressor stops Decrease Decrease the running frequency to the lower level Auto fan running rules Hold Keep the current frequency For MWOHCOS9S MWOHC12S Resume No limitation for frequency MWOHC18S models Note T1 Ts When AC is in hold zone for 3 minutes the compressor frequency will rise to the higher level frequency will increase twice at most E 8 4 2 2 Outdoor fan running rules 6 0 amp 42 8 8 Lb H 5 0 amp 41 0j E por 4 0 6 39 2 8 10 Inna 2 5 8 36 5 8 EEN 1 0 amp 33 8j B 29 For MWOHC24S model 11 Ts 4 amp 39 2 B8 High 316 37 4 8 Medium 1 5 8 34 7 5 1 0 6 33 8 amp Low 8 4 3 Heating Mode 8 4 3 1 Compressor running rules The maximum operation frequency of the compressor after starting submits to the following rule T4 34 8 93 2 5 Off 33 8 91 4 B 28 8 82 4 8 Fmax F2 27 amp 80 6jB 25 8 77 0 5 E 24 6 75 2 8 mars 221 amp 71 6 8 21 8 69 8 6 MARES 19 amp 66 2 amp 18 amp 64 4 B Fmax F5 17 8 62 6 8 S 16 8 60 8 5 DA 15 8 59 0 B Fmax F
54. on e Golden Fin The Golden hydrophilic condenser can improve the heating efficiency by accelerating the defrosting process The unique anticorrosive golden coating on the condenser can withstand the salty air rain and other corrosive elements e Self Clean When this function is activated firstly the indoor unit operates as Fan only mode with low fan speed during this period the condensed water will take some dust on evaporator fins away After that the unit turns to heating operation with low fan speed which dries the inside of indoor unit Finally it turns to fan only mode and blows away the wet air The whole process cleans the internal side of indoor unit and prevents the breeding of bacteria e Follow me With this technology a temperature sensor is built in the remote control when you stay close to the remote control the unit will automatically change the operation mode to supply comfortable temperature just like the air conditioner is following you e Silent mode Indoor fan will run at super breeze speed and indoor unit noise level can be extremely low to 20dB A when the unit enters silent mode operation e Horizontal amp Vertical Swing Function The unit has auto horizontal swing and auto vertical swing function which supplies more even and comfortable air flow e Louver position memory function When starting the unit again after shutting down its louver will restore to the angle originally set by the user e Refrigerant l
55. ondenser Electronic control 201537690004 203337390226 assembly box assembly Pipe temperature Terminal board 4 1 202440500004 20 1 203337590049 sensor assembly assembly 5 Valve plate 1 201237200282 20 1 Wire joint 1 202301400256 6 Chassis assembly 1 201237590091 20 2 Terminal board 1 201237590046 Rear right 4 Ways valve 1 201237590080 21 1 201637391606 clapboard assembly 8 Big handle 1 201237390104 21 1 Gas valve 1 201600720095 9 Water collector 1 201137400000 21 2 4 Ways valve 1 201600690010 Liquid valve 10 Air outlet grille 1 201237390105 22 1 201637391145 assembly 11 Clamp of front net 6 201135110801 22 1 Liquid valve 1 201600740523 73 201601300554 Electronic Front panel 201237400392 22 2 expansion valve assembly 2 201400601510 Axial flow fan 01100390002 Compressor Supporter assembly of fan motor Partition board assembly Discharge 201237390026 25 temperature sensor 202301310068 assembly 201237500259 202301000867 Asynchronous Crankcase electric 14 1 202400300060 24 1 202403100501 motor heater 74 MROHC12AS 18 lt 11 10 lt baas in a i e gt he S Mes q w n w x a pa RK me amp e PA ETA n 3 17 S S ci 22 2 19 S T o 21 2 o os ge T 20 1 pa 22 1 Se E e 20 2 e 21 1 eT a 23 g u e 25 P i e e 8 Ma ei 3 IN 9 e 6 t No Part Name Qty BOMCode No Part Name 0 Ambient t
56. ooling or any other operation mode pressing touch button will turn off the machine 8 4 6 2 In forced operation mode all general protections and remote control are available 8 4 6 3 Operation rules Forced cooling mode The compressor runs at F2 frequency and indoor fan runs as breeze After running for 30 minutes the machine will turn to auto mode as 24 C 75 2 F setting temperature Forced auto mode The action of forced auto mode is the same as normal auto mode with 24 C 75 2 F setting temperature 8 4 7 Timer function 8 4 7 1 Timing range is 24 hours 8 4 7 2 Timer on The machine will turn on automatically when reaching the setting time 8 4 7 3 Timer off The machine will turn off automatically when reaching the setting time 8 4 7 4 Timer on off The machine will turn on automatically when reaching the setting on time and then turn off automatically when reaching the setting off time 8 4 7 5 Timer off on The machine will turn off automatically when reaching the setting off time and then turn on automatically when reaching the setting on time 8 4 7 6 The timer function will not change the AC current operation mode Suppose AC is off now it will not start up firstly after setting the timer off function And when reaching the setting time the timer LED will be off and the AC running mode has not been changed 8 4 7 7 The setting time is relative time 8 4 8 Sleep function mode 8 4
57. oom temperature sensor and setting temperature 8 4 11 Self clean For heat pump models which are provided with this function after running in cooling or drying mode if the user press Self Clean button on remote controller firstly indoor unit runs in fan only mode for a while then low heat operation and finally runs in fan only again This function can keep the inside of indoor unit dry and prevent breeding of mold 8 4 12 Refrigerant Leakage Detection With this new technology the display area will show EC when the outdoor unit detects refrigerant leakage 8 4 13 Louver Position Memory Function When starting the unit again after shutting down its louver will restore to the angle originally set by the user but the precondition is that the angle must be within the allowable range if it exceeds it will memorize the maximum angle of the louver During operation if the power fails or the end user shuts down the unit in the turbo mode the louver will restore to the default angle 8 4 14 8 C Heating optional In heating operation the preset temperature of the air conditioner can be as lower as 8 C 35 which keeps the room temperature steady at 8 C and prevents household things freezing when the house is unoccupied for a long time in severe cold weather 8 4 15 Silence operation optional Press the silence button on remote controller to initiate SILENCE function When the Silence function is activated the compr
58. ould fall with it causing property damage product failure and personal injury e Do not let the air conditioner run for a long time when the humidity is very high and a door or a window is left open e Takecare to ensure that power cable could not be pulled out or damaged during operation There is risk of fire or electric shock e Donot place anything on the power cable There is risk of fire or electric shock e Do not plug or unplug the power supply plug during operation There is risk of fire or electric shock e Do not touch operation the product with wet hands e Do not place a heater or other appliance near the power cable There is risk of fire and electric shock e Do not allow water to run into electrical parts It may cause fire failure of the product or electric shock e Do not store or use flammable gas or combustible near the product There is risk of fire or failure of product e Donotuse the product in a tightly closed space for a long time Oxygen deficiency could occur e When flammable gas leaks turn off the gas and open a window for ventilation before turn the product on e fstrange sounds or smoke comes from product turn the breaker off or disconnect the power supply cable There is risk of electric shock or fire e Stop operation and close the window in storm or hurricane If possible remove the product from the window before the hurricane arrives There is risk of property
59. r extinguished No No Y Replace the indoor main PCB Replace the outdoor main PCB 42 T am MA AT R LART ALAR rura arte om 43 Remark Use a multimeter to test the DC voltage between L2 port and S port of outdoor unit The red pin of multimeter connects with L2 port while the black pin is for S port When AC is normal running the voltage will move alternately between 50V to 50V If the outdoor unit has malfunction the voltage will move alternately with positive value While if the indoor unit has malfunction the voltage will be a certain value Remark Use a multimeter to test the resistance of the reactor which does not connect with capacitor The normal value should be around zero ohm Otherwise the reactor must have malfunction and need to be replaced 9 3 3 Zero crossing detection error diagnosis and solution E2 m Pr Malfunction decision When PCB does not receive zero crossing signal feedback for 4 conditions minutes or the zero crossing signal time interval is abnormal Supposed causes e Connection mistake e PCBfaulty Trouble shooting Check if the connections and No q Correct the connections Tum on the power supply is normal unit when the power supply is good Yes Indoor main PCB is defective Replace indoor main PCB 44 9 3 4 Fan speed has been out of control diagnosis and solution E3 I Malfunction dec
60. rvice the unit be sure to read this service manual at first 1 2 Warning gt Installation e Do not use a defective or underrated circuit breaker Use this appliance on a dedicated circuit There is risk of fire or electric shock o For electrical work contact the dealer seller a qualified electrician or an authorized service center Do not disassemble or repair the product there is risk of fire or electric shock e Always ground the product There is risk of fire or electric shock e Install the panel and the cover of control box securely There is risk of fire of electric shock e Always install a dedicated circuit and breaker Improper wiring or installation may cause electric shock e Use the correctly rated breaker of fuse There is risk of fire or electric shock e Do not modify or extend the power cable There is risk of fire or electric shock e Do not install remove or reinstall the unit by yourself customer There is risk of fire electric shock explosion or injury e Be caution when unpacking and installing the product Sharp edges could cause injury be especially careful of the case edges and the fins on the condenser and evaporator e For installation always contact the dealer or an authorized service center e Do not install the product on a defective installation stand e Be sure the installation area does not deteriorate with age If the base collapses the air conditioner c
61. sor assembly Pipe temperature Pipe nut 201600330001 21 6 sensor assembly 202432390005 202301300584 Cover of electronic 201600330003 22 1 201133090981 control box Fix clamp of 10 201102000305 23 Remote Controller 1 203355091532 temperature sensor Evaporator 4 assembly 1 1 201532890153 24 202720090001 1 1 Fixing board of fan m 13 201133090167 26 Air freshening filter 201131410703 motor Asynchronous 14 202400300064 motor 1 1 1 1 1 1 1 70 MWOHC24S ONLY FOR STANDARD BOM CUSTOMIZED FEATURE MAY CHANGE THE PART LIST H 0 rl i e ccessory pa E E pe de eeh DN wd DW MM UE E M J a gt E LL yl il 0 ie TN Se Ze KA a h 45 p s L WC mn gt A EN Mmaa ER ee po MI M pe gt ba ms IN a SE D n e b Ma gt T P ee E tes A i Fa 9 Bean a t ai Jom x zT ee A E o Pan ame Jay sm ws Part wame ay BOM ove c Panel assembly 1 201133090997 Cross flow fan 1 201100200057 2 Airfiter Ce 201133090992 Chassis assembly i 201133090995 S box 203332390972 19 Pipe clamp board 201133090989 assembly Display board 3 1 1 201332391249 20 Installation plate 1 201232990002 assembly Cover of indoor Electronic control electronic control 201119900948 1 203333090465 box assembly Panel frame 201133090996 Wire joint 1 202301450119 assembly Electronic control Screw cap 201119900950 201133190200
62. sseuse cW 1 e 449242933 C 1 A Oe ai 1 pa AO o re weet m np 0 rv o H at f sso HS de SZ q E e le UA d e L l A A gt q Dq 92 ES S s F T FLUKE COKE Mc ru rur EX 3 e sl SR Kal P e e es a2 A A egen cr CN SZ Eggs TILL LE 2 53 HE 12221222 9 3 8 Over voltage or too low voltage protection diagnosis and solution P1 Moog Malfunction decision An abnormal voltage rise or drop is detected by checking the conditions specified voltage detection circuit Supposed causes e Power supply problems e System leakage or block e PCBfaulty Trouble shooting normal No supply and try to restart the unit l when power supply gets normal Yes tE If all tha connections Correct the connections or replace d Check H the power supply is Disconnect the unit with power and wires are good m g the wires Yes v Power on and when the unit Is In standby check if the voltage between P and N Is around DG ud or 340V or 380V For different Replace the IPM board If It ls inds of units the voltage differs No separate with main PCB Consult with technical engineer to get definite value Then start up the unit measure the voltage between P and N Is itin 220V 400V Yes y Replace outdoor main PCB Remark Measure th
63. sure the voltage of pin1 pin3 pin4 pin3 in fan motor connector If the value of the voltage is not in the range showing in below table the PCB must has problems and need to be replaced Red Black White Yellow Blue DC motor voltage input and output 1 Red vem aaa Ds e 7 s Bw ro wiv 46 2 Outdoor DC Fan Motor control chip is in outdoor PCB CM cem Feedback 1 5 AA FT Sa o 1 Siga mm Hw je GND o Color Red Bue Yellow signal w v iu 1 2 3 Release the UVW connector Measure the resistance of U V U W V W If the resistance is not equal to each other the fan motor must has problems and need to be replaced Otherwise go to step 2 Power on and when the unit is in standby measure the voltage of pin4 5 in feedback signal connector If the value is not 5V change the PCB Otherwise go to step 3 Rotate the fan by hand measure the voltage of pin1 5 pin 2 5 and pin 3 5 in feedback signal connector If any voltage is not positive voltage fluctuation the fan motor must has problems and need to be replaced 47 9 3 5 Open circuit or short circuit of temperature sensor diagnosis and solution E5 Wiring mistake Sensor faulty Trouble shooting Check the connections between temperature sensor and main PCB No Correct the connections Are the connections good Yes y Check the resistance value of the sensor via Yes
64. t LIQUID Side de m ba H o Bu Two way valve em d LOSE A T emeng Sa A OGU ez GAS side L I E Three Way Valve Manifold valve j WE cipse Compound meter f Zi UTR 12 Le 1 Pressure TH ITT 4 92098 3 P MEI Handle LO ead Handle Hi Charge hose Charge hose rd H Vacunmi j pump g a kenn M k i MBCUILITM pimp f mt a A 1 Completely tighten the flare nuts of the indoor and outdoor units confirm that both the 2 way and 3 way valves are set to the closed position 2 Connect the charge hose with the push pin of handle lo to the 3 way valves gas service port 3 Connect the charge hose of handle hi connection to the vacuum pump 20 4 Fully open the handle Lo of the manifold valve 5 Operate the vacuum pump to evacuate 6 Make evacuation for 30 minutes and check whether the compound meter indicates 0 1Mpa 14 5Psi If the meter does not indicate 0 1Mpa 14 5Psi after pumping 30 minutes it should be pumped 20 minutes more If the pressure can t achieve 0 1Mpa 14 5Psi after pumping 50 minutes please check if there are some leakage points Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump Confirm that the gauge needle does not move approximately 5 minutes after turning off the vacuum pump 7 Turn the flar
65. test port D S E NE USE connect to the comperssor top temp sensor connect to detector CAPACITNR Voltoge CN300 0v DC 290 330VDC standby 250 350V DC Running e on en aa E ae lag 16 MROHC18AS current Eoo saa 202302130651 CN6 CN9 CN7 CN8 HA connect to compressor heater when heater Is MN output 208 230V AC BLUE BREWN the ralay output wlre cross t FUSE Is compon 84oAL 250VAC 208 230V AC connect CN30 CN29 CN3 connect to the earth FUSE Te0AL 250VAC CNHICS Signal wire connect to the terminal 24VDC Pulse wave betweene CND CNI115 CNICN IND CN38 YE CN27 connect to CNe5 a CNECL IND CN37 e power supply 208 230V AC connect to the terminal E Va D qd PN CN14 4 G connect to the comperssor top temp sensor H ov DC 2 eS um y e R ds CNI6 Bag CN20 2 m CNIS Len CN22 CN22 p l s ss H m NN USE EA ARI gS LED on and LED1 off standby NE USE test port a na e c un 4 g LED off and LEDI on running connect to detector n HIN s ad E 3 LEDH Other status error fo f 3 8 m eS ES D n D H m E a d LED4 id Ught 9 5 7 when power Is on LED4 aways on 17 V Rectifler Voltage 205 240V DC standby 210 300V DC Running connect to the compressor OVAC standby 10 200VAC running MROHC24AS CN
66. the running frequency to the lower level Hold Keep the current frequency Resume No limitation for frequency Note When AC is in hold zone for 3 minutes the compressor frequency will rise to the higher level The frequency will increase twice at most 8 4 3 2 Outdoor fan running rules T4 17 8 62 6 5 L 15 amp 59 0 B 12 amp 53 6 amp M 10 amp 50 0 amp H 8 4 3 3 Indoor fan running rules Indoor fan speed can be set as high medium low silent mode or auto grade During all the fan speeds the anti cold wind function is preferential If the compressor stops caused by the room temperature rising the indoor fan will run at super breeze When the compressor is running the indoor fan is controlled as below T2 TEL8 TEL7 TEL6 Setting TELS Medium TEL4 TEL3 Low TEL2 TEL1 Breeze TELO Super Breeze Off For MWOHC24S model speed H E ENE 3 S o Aene nz EA Y unen 3 M M M 27 E E IIS AS IN Sec RA VW R H H w MAMI f Sei H WOW ORE H WA R WAR H Sei EVA R For MWOHCO9S MWOHC12S MWOHC18S models 31 6 5 6 20 3 8 T12 8 TEL8 TEL TEL6 TELS Medium TEL4 TEL3 Low TEL2 TELO Breeze T1 Ts E 0 0 amp 32 B 1 amp 30 2 B 2 amp 28 4 B 3j amp 26 6j B 4 amp 24 8 B 5 8 23 0 8 6 amp
67. ure to use a torque wrench to tighten the service port cap to a torque 18N m Be sure to check the gas leakage 6 5 Adding the refrigerant after running the system for many years Procedure 1 Connect the charge hose to the 3 way service port open the 2 way valve and the 3 way valve Connect the charge hose to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure liquid charge 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air be careful of the liquid refrigerant 21 3 Put the charging cylinder onto the electronic scale and record the weight 4 Operate the air conditioner at the cooling mode 5 Open the valves Low side on the charge set and charge the system with liquid refrigerant 6 When the electronic scale displays the proper weight refer to the gauge and the pressure of the low side disconnect the charge hose from the 3 way valve s service port immediately and turn off the air conditioner before disconnecting the hose 7 Mount the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N m Be sure to check for gas leakage 6 6 Re installation while the indoor unit need to be repaired 1 Collecting the refrigerant into the outdoor unit m Procedure 1 Confirm that both the 2 way and 3 w

Model Numbers:

Contents

Download Pdf Manuals

Related Search

Related Contents