Technical service manual 2006
Contents
1. b Outdoor unit M40A 27HRIN1 res EPE II asa a Sg 3 Refrigeration Cycle Diagram 3 1 Refrigeration circuit drawing of inverter quadplex type CapillaryA EXVA Liquid valve A Axial flow fan AAAAAA gt we X Auxiliary Ser Filter A Capilla i Bch Exhaust pray Main Capillary B LEXV B Liquid valve B temp sensor o Capillary V Filter B rece Capil ary C lt EXV C Liquid valve C Z Condenser Coil temp Valve V HX en x sensor sabe s Capillary C EXV C Liquid valve D valve nee i p Filter C Indoor pipe out temp seneor A Gas valve A 7 N Indoor pipe out Compressor temp seneor B Gas valve B Indoor pipe out temp seneor C Gas valve C Indoor pipe out temp seneor D Gas valve D Outdoor Unit 3 2 Refrigeration circuit drawing of inverter trinary type PRAIA Capillary A EXVA Liquid valve A Auxiliary ets KD L Capillary 0 Exhaust Main A p y Filter A temp sensor Capillary b Capillary B _LEXVB Liquid valve B Check pare Filter B Condenser Coil temp Valve Capillary C TEXVC Liquid valve C 4 way YW f sensor AAD valve Filter C Indoor pipe out temp seneor A Gas valve A Ci Indoor pipe out en temp seneor B Gas valve B Indoor pipe out temp seneor C Gas valve2. is frequency in wires but compressor do not run the compressor is defective 2 Between U V W three terminals the resistance is about 0 6 29 Display LED STATUS P5 Outdoor low temp protection This is optional factory standard unit does not have this function Unit stops when outdoor temp is lower than 15 C and lasting time more than 60 minutes and unit runs again when outdoor temp more than 12 C Is the outdoor temp lower than 15 C Replace the outdoor main board Replace the outdoor temp sensor Display LED STATUS P6 Condenser high temperature protection When outdoor pipe temp is more than 65 C the unit will stop and unit runs again when outdoor pipe temp is less than 52 C Is the outdoor pipe temp more than 65 C Is the outdoor pipe temp sensor right according to the annex 1 Replace the outdoor main board Replace the outdoor pipe temp sensor 30 Characteristic of temp sensor Annex 1 Temp Resistance KO Temp Resistance KO Temp Resistance KO 10 62 2756 17 14 6181 44 4 3874 9 58 7079 18 13 918 45 4 2126 8 56 3694 19 13 2631 46 4 0459 7 52 2438 20 12 6431 47 3 8867 6 49 3161 21 12 0561 48 3 7348 5 46 5725 22 11 5 49 3 5896 4 44 23 10 9731 50 3 451 3 41 5878 24 10 4736 51 3 3185 2 39 8239 25 10 52 3 1918 1 37 1988 26 9 5507 53 3 0707 0
3. C Outdoor Unit Cross flow fan Evaporator Indoor Unit Cross flow fan Evaporator Indoor Unit 3 2 Refrigeration circuit drawing of inverter binary type Axial flow fan EXVA Auxiliary _ Filter A Liquid valve A Exhaust Main Capillary MIN x temp sensor Capillary Capillary A WA EXVB j Check Filter B Liquid valve B Condenser Coil temp Valve AAAAAN gt I S 7 4 Way Q sensor Capillary B 3 2 valve S 8 Indoor pipe out temp seneor A PAS valve A Compressor Indoor pipe out temp seneor B Gas valve B Indoor Unit Outdoor Unit 4 Operation Temperature Limits Indoor temperature 17 32 Cooling mode p U11321 Outdoor temperature og 500 Heating mode Indoor temperature lt 30 Outdoor temperature 150 0 330 Ditmas Indoor temperature 100 320 y Outdoor temperature og 500 5 Indoor units combination 5 1 M2OA 18HRIN1 Indoor units can be combined by 7000Btu h 9000 Btu h 12000Btu h 7000Btu h 9000 Btu h 7000Btu h 12000Btu h 9000Btu h 9000 Btu h 9000Btu h 12000Btu h 12000Btu h 12000Btu h 12000Btu h 18000Btu h 9000Btu h 18000Btu h 7000Btu h 18000Btu h 5 2 M3OA 27HRIN1 Indoor units can be combined by 7000Btu h 9000 Btu h 12000Btu h 7000Btu h 9000 Btu h 7000Btu h 12000Btu h 9000Btu h 9000 Btu h 9000Btu h 12000Btu h 12000Btu h 12000Btu h 12000Btu h 18000Btu h 9000Btu h 18000Btu h 7000Btu h 18000Btu h 7000Btu h 2 9000 Btu h 7000Btu h 2 12000 Btu h 7000B
4. Se COMPRESSOR 3 E 5 CONNECTOR sxi TT ED 255 HAS an a EDI zS LN Ba Een n bk a YG Y G Ya Y G i 0509096 RECTIFILER2 RECTIFILERI BLUE 12 7 Wire connection 7 1 Connection wire specification Standard Cores Thickness mm2 Wire cover length mm specification Connection wire between indoor 6000 4 10 Neoprene unit and outdoor L N S Grounding Y ZW 300 500V unit Remark The connection wire between indoor unit and outdoor unit is standard And it is packaged in the indoor unit 7 2 Connection wire drawing Den Tight cincture Heat retractile pipe GA 21 9 37 120 PS magnetism cycle ie el ae 13 2 Neoprene YZV 00 500V Grounding 1 0mm lt N Grouding terminal Wire connection terminal 8 Electronic control function 8 1 Protection 1 3 minutes delay at restart for compressor 2 Temperature protection of compressor top compressor stops when the temp of top of compressor is more than 120 C compressor runs when the temp of top of compressor is less than 105 C 3 When AC voltage gt 270V for 30 seconds Outdoor Unit stops operation and alarms When AC voltage lt 260V for 30 seconds outdoor unit resumes operation 4 Inverter module protection Inverter module Protection itself has a protection function against current voltage and temperature 5 Sensor protection at open circuit and breaking disconnect
5. room temperature when the air conditioner is in FAN only operation When the unit stops operation it returns to original factory settings 18 Displays the malfunction code or protection code 8 9 9 FAN SPEED indication lamp Displays the selected fan speed AUTO nothing and three fan speed levels LOW MED and HIGH 8 10 Outdoor unit LED display function 1 When stand by it display number of indoor unit online 2 When operation it display frequency of outdoor unit 3 When defrost it display df 4 When a protection or error occurred it displays error code or protection code 8 11 Check function There is a check button on outdoor pcb When push this button the outdoor LED can display in sequence Capacity demand Running mode revised capacity fan state No 1 evaporator pipe temp No 2 evaporator pipe temp No 3 evaporator pipe temp No 4 evaporator pipe temp outdoor pipe temp Outdoor temp discharge gas temp current of outdoor unit No 1 opening degree of electronic expansion valve No 2 opening degree of EXV No 3 opening degree of EXV No 4 opening degree of EXV indoor unit number last protection error code capacity demand cycle Explanation for the some display content 1 Running mode Display Corresponding mode 0 Off 1 Cooling mode 2 Heating mode 2 Fan state Display Corresponding mode 0 Off 1 Low fan 2 High fan
6. 3 Opening degree of EXV Opening degree equals the display data times 8 4 Number of indoor unit The indoor unit that can communicate with outdoor unit normally 8 12 Outdoor fan speed control There is one fan with two speed the fan speed is controlled according ambient temp After the compressor stop 30 seconds later the fan stops When cooling N gt 27 High speed Ambient temp rise lt 27 Low speed Ambient gt 25 High speed temp decline lt 25 Low speed When heating gt 14 Low speed Ambient temp rise i lt 14 High speed Ambient gt 12 Low speed temp decline lt 12 High speed 8 13 Oil return function If operation frequency is lower than 54Hz in 2 hours consecutively it will be increased to 62Hz for 3 minutes Then it recovers to the former operation frequency 20 9 Troubleshooting for outdoor unit 9 1 Safety Because of there are capacitors in PCB and relative circuit in outdoor unit even shut down the power supply electricity power still are kept in capacitors do not forget to discharge the electricity power in capacitor The value of resistance is about 1500 ohm to 2000 ohm Resistance The voltage in P3 and P4 in outdoor PCB is high voltage about 310V The voltage in P5 and P6 in outdoor PCB is high voltage about 310V 21 9 2 LED error code display for indoor unit Display LED STATUS EO EEPROM error E1 Indoor a
7. 35 2024 27 9 1245 54 2 959 1 33 3269 28 8 7198 55 2 8442 2 31 5635 29 8 3357 56 2 7382 3 29 9058 30 7 9708 57 2 6368 4 28 3459 31 7 6241 58 2 5397 5 26 8778 32 7 2946 59 2 4468 6 25 4954 33 6 9814 60 2 3577 7 24 1932 34 6 6835 61 2 2725 8 22 5662 35 6 4002 62 2 1907 9 21 8094 36 6 1306 63 2 1124 10 20 7184 37 5 8736 64 2 0373 11 19 6891 38 5 6296 65 1 9653 12 18 7177 39 5 3969 66 1 8963 13 17 8005 40 5 1752 67 1 830 14 16 9341 41 4 9639 68 1 7665 15 16 1156 42 4 7625 69 1 7055 16 15 3418 43 4 5705 70 1 6469 31 Annex 2 1 Reference voltage data a Rectifier Input 220 230V AC output 310V DC Normally In power board P3 and P4 310V DC P5 and P6 310V DC b Inverter module U V W 3ph Result U V 60 150V AC U W 60 150V AC V W 60 150V AC P N DC 310V c Photo couple PC817 PC851 Control side lt 5V AC side lt 24V AC d S terminal and N changeable from 0 24V 2 Check the Diode Bridge component In wiring diagram rectifier Remark If this part is abnormal the LED will not light Multi meter Result Forward Resistance Backward Resistance Infinite Infinite 500 ohm Infinite 500 ohm Infinite 32
8. GD Midea Retrigeration Equipment Co Ltd MULTI SPLIT TYPE HEAT PUMP AIR CONDITIONERS Technical service manual 2006 R410A Vertu Inverter multi Series Indoor Models MSV11 09HRDN1 MSV11 12HRDN1 Outdoor Models M20A 18HRIN1 M30A 27HRIN1 M40A 27HRIN1 1 Product features 2 Dimensions 3 Refrigeration cycle diagram 4 Operation temperature limits 5 Indoor units combination 6 Wiring diagram 7 Wiring connection 8 Electric control functions 9 Troubleshooting Annex 1 Characteristic of temp sensor Annex 2 Reference data 1 Product Features 1 1 Powerful at cooling heating 1 2 Low voltage start up function 1 3 Anti icing function at cooling mode 1 4 Anti cold air function at heating mode 1 5 Auto defrosting 1 6 Outdoor electric current protection 1 7 Temperature protection of the outdoor compressor top 1 8 Error self diagnosis function 1 9 Free connection between indoor and outdoor unit 2 Dimensions 2 1 Indoor unit mj aE Dimension W H D Mode 9K 795 270 165 12K 845 286 165 2 2 Outdoor unit a Outdoor unit M2OA 18HRIN1 amp M3OA 27HRIN1 845 Tv JC C CIC CIC KENI Q c oe J wy
9. and duct can not be combined in a system When heating capacity attenuate sharply if indoor unit capacity exceed too much 6 Wiring Diagram 6 1 Indoor unit 2205209008 CNG N12 CN11 CN14 AUTO RESTART TTT n w OUTDOOR UNIT TRANSFORMER SWITCH BOARD DISPLAY BOARD 6 2 Outdoor unit M20A 18HRIN1 weende sas aa E benenden sonic seepeansseuedewusinus de bad leet E AE eepeeweaaed vad LERNE ELECTRONIC HEPANSIVE EXPANSIVE VALVE A YALE B HEAT EECHANGER aS DOT mn sis EH TEP Ay ares Xe Pore E IST BACK TEMP SENSOR FILTER pap GE l se CONNECTOR KIA SER COMPRESSOR INDOOR PIPE OUT PIPE OUT TENP B INDOOR TEMP A RECTIFIER RECTIFIER si 4 TAYS VALVE 6 3 Outdoor unit M3OA 27HRIN1 ELECTRONIC ELECTRONIC ELECTRONIC EXPANSIVE EEPANSIVE EXPANSIVE VALVE A VALVE B VALVE C TEMP gt Grote or E BLACK TEMP SENSOR FILTER TE RED WITE COMPRESSOR INDOOR INDOOR PIPE OUT PIPE GUT PIPE OUT TEMP B TEMP A TEMP C IPM BLUE RED BLACK Uh th 1 1OPTN L I Lt INDOOR SOCKET RECT IFILER2 RECTIFILER 4 WAYS VALVE 11 6 4 Outdoor unit M40A 27HRIN1 ELECTRONIC ELECTRONIC ELECTRONIC ELECTRONIC EXPANSIVE EXPANSIVE EXPANSIVE EXPANSIVE VALVE A VALVE B VALVE C VALVE D erere Bowes R Kx DQ LISENSR wam a TE i mir P 1 PRorEcren F a E meP
10. e time Heating mode has a priority 8 3 1Definition Cooling mode Heating Mode Fan Off Cooling mode No Yes No No Heating Mode Yes No Yes No Fan No Yes No No Off No No No No No No mode conflict Yes Mode conflict 8 3 2 Unit action e In case of one Indoor unit working in cooling mode or fan mode and another indoor unit is set to heating mode the indoor unit working in cooling mode or fan mode will 16 change to stand by The outdoor unit will work in heating mode e In case of one Indoor unit working in heating mode and another indoor unit is set to cooling mode or fan mode the indoor unit setting to cooling mode or fan mode will change to stand by 8 4 Manual switch Mode changes when push this button Cooing mode Auto mode gt Unit off gt Cooing mode At Cooing mode after 30 minutes cooling operation whose fan speed is set as low the A C operates with a setting temp of 24 C At auto mode the A C operates with a set temp of 24 C 8 5 Timer Function 1 The maximum length of timer is 24 hours and the minimum resolving power is 15 minutes 2 Timer on first turn off the A C the A C will be automatically on at the set time 3 Timer off first turn on the A C the A C will be automatically off at the set time 4 Timer on off function on time is earlier than off time first turn off the A C it will be automatically on at set time and later be off at the set time then unit turn
11. g fan speed can be set in high mid low Auto 2 Auto fan at cooling mode T Indoor Temp Setting Temp Condition Indoor fan speed Room temp up T lt 1 5 C Low 1 5 C lt T lt 4 C Mid T gt 4 C High Room temp down T gt 3 C High 1 C lt T lt 3 C Mid T lt 1 C Low 3 Anti freezing control to indoor evaporator at cooling mode T evaporator temp 14 Evaporator Temp Compressor T lt 4 C Off T gt 8 C On 8 2 2 Dehumidifying mode 1 The indoor fan is fixed in low speed 2 Low room temperature protection When room temperature decreases to below 10 C indoor fan stop when room temperature restores to over 12 C indoor fan start 3 At dehumidifying mode the anti freezing function of the indoor heat exchanger is the same as that of cooling mode 8 2 3 Heating mode 1 Indoor Fan actions at heating mode Indoor Fan can be set at HIGH MID LOW AUTO by using a remote controller but Anti cold wind function prevails Anti cold wind control function at heating mode Condition Indoor fan speed T Indoor exchanger temp Indoor exchanger temp T lt 34 C Off up 34 C lt T lt 37 C Breeze 37 C lt T lt 44 C Low speed T gt 44 C Setting fan speed Indoor exchanger temp T gt 38 C Setting fan speed down 33 C lt T lt 38 C Low speed 24 C lt T lt 33 C Breeze T lt 24 C Off Auto wind at heating mode Conditio
12. ion 6 Fan Speed is out of control When Indoor Fan Speed is too high higher than High Fan 300RPM or too low lower than 400RPM the unit stops and LED displays failure information and can t return to normal operation automatically 7 Cross Zero signal error warning If there is no Cross Zero signals in 4 minutes the unit stops and LED displays failure information and can t return to normal operation automatically 8 Current protection When the current is more than 25A the compressor stops 9 Outdoor condenser high temperature protection Under cooling mode if T3 gt 65 C for 3 minutes the compressor will stop When T3 lt 52 C the protection is not valid 10 Outdoor low temperature protection If the outdoor temperature is lower than 15 C for 1hour the compressor and fan motor will stop If the outdoor temperature is higher than 12 C for 10 minutes and the compressor stops operation for 1h or the outdoor temperature is higher than 5 C for 10 minutes then restart and enter into the prior operation mode 11 Compressor pre heating function When the outdoor temperature is lower than 3 C and the compressor stops operation for more than 3 hours or the outdoor temperature is lower than 3 C and the power is just put on the compressor enters into pre heating condition When outdoor temp is more than 5 C or user operate it pre heating condition will finish 8 2 Operating mode 8 2 1 Cooling mode 1 Indoor fan keeps runnin
13. mal Normally the resistance of the protector is 0 ohm Gas charging Is abnormality the same after gas charging Replace protector Check the outdoor main PCB Refrigerant system such as clogging of capillary clogging of pipe etc 27 Display LED STATUS P3 Compressor current protection Check the resistance of compressor normally U and V is 0 6 ohm U and W is 0 6 ohm V and W is 0 6 ohm The compressor is defective Turn one indoor unit only Does the compressor start after 3 minutes The compressor is defective Does the trouble occur again after compressor running some time Check the refrigerant circulation volume and pressure If refrigerant circulation volume and pressure is OK change the outdoor main PCB 28 Display LED STATUS P4 Inverter module protection Check the connectors CN12 CN7 CN1 in outdoor PCBs Is connection to connector good Yes Are the wires to compressor right Yes Check the outdoor inverter module Repair connector Is it breakdown between P N P U P V N W N U N V At inverter module Normally P N 1 0MQ P U 2 0MO P V 2 0MO P W 2 0MO N W 1 0MOQ N U 1 0MO N V 1 0MOQ Inverter module is defective Check compressor 1 Turn on the unit in cooling or heating in different season use a frequency meter to test the frequency in one of the three wires to compressor if there
14. n Indoor fan speed T Indoor Temp Setting Temp Room temp up T lt 1 5 C High 1 5 C lt T lt 2 5 C Mid T gt 2 5 C Low Room temp down T lt 1 0 C High 1 0 C lt T lt 2 0 C Mid T gt 2 0 C Low Indoor evaporator high temperature protection at heating mode Condition Compressor T Indoor exchanger temp T lt 48 C On 53 C lt T lt 63 C Decrease frequency of compressor T gt 63 C Off 8 2 4 Defrost operation 1 Defrosting condition The temperature of outdoor heat exchanger remains consecutively lower than 2 c for more than 40 minutes 2 Ending condition of defrosting If one of following conditions is satisfied end the defrosting and turn into heating mode a The defrost time has reached to 10 minutes b When the temperature of outdoor heat exchanger rises up to 15 C 3 Defrosting Actions a Compressor runs b 4 way valve switches off c Outdoor fan switches off d Indoor fan running according to anti cold wind function in heating mode 4 Automatic operation mode The air conditioner automatically selects one of the following operation modes cooling heating or fan only according to the temp difference between room temp TA and set temp TS TA TS Operation mode TA TS gt 2 C Cooling 1 C lt TA TS lt 2 C Fan only TA TS lt 1 C Heating air only for cooling only type 8 3 Mode conflict The indoor units can not work cooling mode and heating at sam
15. n off the power supply and turn it on again after 1 minute Does the trouble occur again 23 Display LED STATUS Ei No 1 Indoor units pipe temp sensor or connector of pipe temp sensor is defective Is connection to connector of pipe temp sensor good Yes Check the resistance of the temp sensor according to Annex 1 Repair connector Replace the sensor Display LED STATUS E2 No 2 Indoor units pipe temp sensor or connector of pipe temp sensor is defective Is connection to connector of pipe temp sensor aood Repair connector Check the resistance of the temp sensor according to Annex 1 Replace the sensor Display LED STATUS ES No 3 Indoor units pipe temp sensor or connector of pipe temp sensor is defective Is connection to connector of pipe temp sensor aood Repair connector Check the resistance of the temp sensor according to Annex 1 Replace the sensor 24 Display LED STATUS E4 Outdoor units temp sensor or connector of temp sensor is defective Is connection to connector of pipe temp sensor good Repair connector Check the resistance of the temp sensor according to Annex 1 Replace the sensor Display LED STATUS E5 Compressor voltage protection Check the voltage of power supply if the voltage is about 220V turn off the power suppl
16. nd outdoor unit communication error E2 Zero crossing examination error E3 Fan speed beyond control E5 Outdoor units temp sensor or connector of temp sensor is defective E6 Indoor units temp sensor or connector of temp sensor is defective PO Inverter module protection P1 Outdoor unit voltage protection P2 Compressor top temperature protection P3 Outdoor low temp protection P4 Inverter compressor drive protection P5 Mode conflict protection 9 3 LED error code display for outdoor unit Display Explanation EO EEPROM error E1 No 1 Indoor units pipe temp sensor or connector of pipe temp sensor is defective E2 No 2 Indoor units pipe temp sensor or connector of pipe temp sensor is defective E3 No 3 Indoor units pipe temp sensor or connector of pipe temp sensor is defective E4 Outdoor temp sensor or connector of temp sensor is defective E5 Compressor voltage protection E6 No 4 Indoor units pipe temp sensor or connector of pipe temp sensor is defective E7 Outdoor inverter communication error P0 Compressor top protection against temperature P1 High pressure protection reserve P2 Low pressure protection reserve P3 Compressor current protection P4 Inverter module protection P5 Outdoor low temp protection P6 Condenser high temperature protection 22 9 3 Trouble shooting Display LED STATUS EO EEPROM error Replace the indoor PCB Temporarily tur
17. s on at set time 5 Timer off on function off time is earlier than on time first turn on the A C it will be automatically off at set time and later be on at the set time then unit turns off at set time 8 6 Sleep mode 8 6 1It is available at cooling heating or auto mode 8 6 2Cooling The set temperature rise 1 C per hour Two hours later the set temperature will maintain as a constant and the fan speed is kept at low speed 8 6 3Heating The set temperature decrease 1 C per hour Two hours later the set temperature will maintain as a constant and the air circulation is kept at low speed Cold air proof function takes precedence over all 8 6 4 Auto The Sleep Mode running function operates in accordance with selected running mode by auto mode 8 6 5After 7 hours unit cancels this mode automatically J2 On On Off Off J3 On Off On Off Stop time 7 hours 8 hours 6 hours 7 hours 17 8 7 Auto restart function In case of a sudden power failure this function automatically sets the unit to previous settings before the power failure when power returns 8 8 Capacity test frequency locked When test the cooling capacity the frequency can be locked at Rated Frequency by following the below 1 Setthe indoor temp to 17 C and high speed 2 Push the outdoor check button for 5 seconds then its frequency can be fixed at Rated Frequency After the test is over turn off the indoor to exit When tes
18. t the heating capacity the frequency can be locked at 85Hz by following the below 1 Setthe indoor temp to 30 C and high speed 2 Push the outdoor check button for 5 seconds then its frequency can be fixed at Rated Frequency After the test is over turn off the indoor to exit 8 9 Indoor unit indicator displayer 8 9 1 OPERATION indicator This indicator flashes after power is on and illuminates when the unit is in operation 8 9 2 AUTO indicator This indicator illuminates when the air conditioner is in AUTO operation 8 9 3 G gt TIMER indicator This indicator illuminates when TIMER is set ON OFF 8 9 4 CLEAN AIR indication lamp Lights up when CLEAN AIR feature is activated and lonizer can generate abundant anions to fill the room with refreshing and natural air 8 9 5 PRE DEF Indicator For Cooling amp Heating models only This indicator illuminates when the air conditioner starts defrosting automatically or when the warm air control feature is activated in heating mode 8 9 6 TURBO indication lamp Lights up when select TURBO function on cooling operation or on heating operation 8 97 FREQUENCY indicator This indicator appears only when the compressor is in operation and indicates the current operating frequency 8 9 8 TEMPERATURE indicator Usually it displays the temperature settings When change the setting temperature this indicator begins to flash and stops 20 seconds later It displays the
19. tu h 2 18000 Btu h 7000Btu h 3 9000Btu h 2 7000 Btu h 9000Btu h 2 12000 Btu h 9000Btu h 3 12000Btu h 2 7000 Btu h 12000Btu h 2 9000 Btu h 12000Btu h 7000Btu h 9000Btu h 5 3 M40A 27HRIN1 Indoor units can be combined by 7000Btu h 9000 Btu h 12000Btu h 7000Btu h 9000 Btu h 7000Btu h 12000Btu h 9000Btu h 9000 Btu h 9000Btu h 12000Btu h 12000Btu h 12000Btu h 12000Btu h 18000Btu h 9000Btu h 18000Btu h 7000Btu h 18000Btu h 7000Btu h 2 9000 Btu h 7000Btu h 2 12000 Btu h 7000Btu h 2 18000 Btu h 7000Btu h 3 9000Btu h 2 7000 Btu h 9000Btu h 2 12000 Btu h 9000Btu h 2 18000 Btu h 9000Btu h 3 12000Btu h 2 7000 Btu h 12000Btu h 2 9000 Btu h 1 2000Btu h 3 7000Btu h 9000Btu h 12000Btu h 7000Btu h 9000Btu h 18000Btu h 9000Btu h 9000Btu h 18000Btu h 7000Btu h 12000Btu h 18000Btu h 9000Btu h 12000Btu h 18000Btu h 7000Btu h 2 9000 Btu h 2 7000Btu h 2 9000 Btu h 12000 Btu h 7000Btu h 3 9000 Btu h 7000Btu h 3 12000 Btu h 7000Btu h 3 18000 Btu h 7000Btu h 4 9000Btu h 2 7000 Btu n 12000 Btu h 9000Btu h 3 7000 Btu h 9000Btu h 3 12000 Btu h 97000Btu h 4 Remark 1 2 3 One two three or four indoor units can be connected according your need As 18000 Btu h unit just Cassette and duct are available There should be no more two duct indoor units and other indoor units should be all wall mounted in a system There should be no more one cassette and other indoor units should be all wall mounted in a system Cassette
20. y to indoor unit and turn it on again after 1 minute Does the trouble occur again Yes Check the voltage of secondary of T3 transformer in outdoor power board is this voltage 12 14V AC No Replace the outdoor power board 25 Display LED STATUS E7 Indoor outdoor units communication protection Is the LED in outdoor main PCB light Check the signal wires between outdoor PCB s is it connected good 1 ls the 5 voltage in outdoor main board Power Board CN1 Red wire and yellow GND Outdoor main PCB CZ1 2 ls the 12 voltage in outdoor main board Power Board CN1 Purple wire and yellow GND Inverter module defective Rectifier circuit is bad connection or defective when the voltage in outdoor is abnormal P3 and P4 310V DC P5 and P6 310V DC Check the PC521 PC851 at Outdoor power PCB Normally Input voltage lt 5V changeable Output voltage lt 24V changeable Outdoor power PCB is defective Yes Check the PC817 PC851 at Indoor main PCB and outdoor main board Normally Input voltage lt 5V changeable Output voltage lt 24V changeable Indoor PCB or outdoor main PCB are defective 26 Display LED STATUS P0 Compressor top protection against temperature Off 120 C On 105 C Does compressor operate No r Is protector on the top of compressor Is refrigerant circulation volume normal P P P nor
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