1. General information of Outdoor Units
Contents
1. Display Number of indoor unit 1 1 2 2 6 4 5 Outdoor ambient temp Display Corresponding temp Display Corresponding Display Corresponding temp temp 15 7 5 50 10 80 25 16 7 51 10 5 81 25 5 17 6 5 52 11 82 26 18 6 53 11 5 83 26 5 19 5 5 53 11 5 84 27 20 5 54 12 85 27 5 21 4 5 55 12 5 86 28 22 4 56 13 87 28 5 23 3 5 57 13 5 88 29 24 3 58 14 89 29 5 26 2 59 14 5 90 30 27 1 5 60 15 91 30 5 28 1 61 15 5 92 31 29 0 5 62 16 93 31 5 30 0 63 16 5 93 31 5 31 0 5 63 16 5 94 32 32 1 64 17 95 32 5 33 1 5 65 17 5 96 33 34 2 65 17 5 97 33 5 35 2 5 66 18 98 34 36 3 67 18 5 99 34 5 37 3 5 68 19 10 35 40 38 4 69 19 5 11 40 45 39 4 5 70 20 12 45 50 40 5 71 20 5 13 50 55 41 5 5 72 21 14 55 60 42 6 73 21 5 15 60 65 43 6 5 74 22 16 65 70 44 7 75 22 5 45 7 5 75 22 5 46 8 76 23 47 8 5 77 23 5 48 9 78 24 49 9 5 79 24 5 6 4 6 Opening degree of electronic expansion valve Actual opening degree equals the display data divided 8 6 5 Protection 6 5 1 Three minutes delay at restart for compressor 6 5 2 Temperature protection of compressor discharge When the compressor discharge temp is getting higher the running frequency will be limited as below rules 1 102 C T5 115 C decrease the frequency to the lower level every 2 minutes till to F1 If 5 gt 115 for 10 seconds2. CONTENTS General information of Outdoor Units 3 DIMENSI N 4 Wiring Diagram ii i aa rail dp dk bg ida a ada ba d Ga a d ida g a ada idi 5 Refrigeration Cycle Diagram 7 Indoor nits combination 2 2 2 2 2220 ns an a ese deucaebeetednenseucuacadiecenteceduantbecdetedTendeuteatetees 8 Electronic control function ecccecc cerent ccr ann ann anna an Lean aa ann nn ore rues 9 Troubleshooting E 1 pais ana capu nada Cad Falda saa na Boca siebadesaazsdecacdaaducuaeausaucdeducadd 14 1 General information of Outdoor Units Outdoor unit Power relay control Low noise air flow system Hydrophilic aluminum fin The hydrophilic fin can improve the heating efficiency at operation mode 4 way valve control It is only operated in the heating operation mode except defrosting operation Anti rust cabinet Valve protection cover It protects the valves and prevents water from dripping Discharge pipe temperature protection Compressor crankcase heat
3. EG Indoor units temp sensor or connector of temp sensor is defective PO Inverter module protection P1 Outdoor voltage too low protection P2 Compressor discharge temp protection P3 Outdoor temp too low protection P4 Compressor driving protection 7 2 Outdoor unit error code explanation Display LED STATUS 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 EG E4 No 4 Indoor units pipe temp sensor or connector of pipe temp sensor is defective Outdoor temp sensor or connector of temp sensor is defective E5 Compressor volt protection E7 Communication error between outdoor IC and DSP PO Compressor discharge temp protection Pi High pressure protection just for 36K 1x4 units P2 Low pressure protection just for 36K 1x4 units P3 Compressor current protection P4 Inverter module protection P5 Outdoor temp too low protection P6 Condenser high temperature protection P7 Compressor driving protection PF PFC protection 7 3Trouble shooting 7 3 1 Indoor unit trouble shooting Indoor unit display LED STATUS EO E
4. 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 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 Annex 2 1 Reference voltage data a Rectifier Input 220 230V AC output 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 31 OV Photo couple PC817 PC851 2 Check the Diode Bridge component In wiring diagram rectifier Control side lt 5V AC side lt 24V AC d Sterminal and N changeable from 0 24V Remark If this part is abnormal the LED will not light Multi meter Result
5. Indoor Unit Cross flow fan Evaporator Indoor Unit 5 Indoor units combination 5 1 Indoor unit combination for One unit Two unit 9 9 9 9412 12 5 2 Indoor unit combination for One unit Two unit Three unit 9 949 9412 94949 949412 12 12412 5 3 Indoor unit combination for One unit Two unit Three unit Four unit 9 949 94 12 9 9 9 9 9 12 9 9 9 9 9 9 9 12 9 9 12 12 12 12 12 9 12 12 12 12 12 6 Electronic control function 6 1 Abbreviation T1 Indoor ambient temperature T2 Coil temperature of indoor heat exchanger middle T2B Coil temperature of indoor heat exchanger outlet T3 Coil temperature of outdoor heat exchanger T4 Outdoor ambient temperature T5 Compressor discharge temperature Ts Setting temp 6 2 Electric control working environment 6 2 1 Input voltage 230V 6 2 2 Input power frequency 60Hz 6 2 3 Indoor fan normal working amp is less than 1A 6 2 4 Outdoor fan Normal working amp is less than 1 5A 6 2 5 Four way valve normal working amp is less than 1A 6 2 6 Swing motor DC12V 6 3 Outdoor unit s digital display tube There is a digital display tube in outdoor PCB Digital display tube display function In standby the LED displays n compressor operation the LED display the running frequency e In defrosting mode The LED displays dF or alternative displ
6. Is connection to connector of pipe temp sensor good Check the resistance of the temp sensor according to Annex 1 Repair connector Outdoor unit display LED STATUS E3 No 3 Indoor units pipe temp sensor or connector of pipe temp sensor is defective Replace the sensor Is connection to connector of pipe temp sensor good Check the resistance of the temp sensor according to Annex 1 Repair connector Outdoor unit display LED STATUS EG No 4 Indoor units pipe temp sensor or connector of pipe 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 Outdoor unit display LED STATUS E4 Outdoor units temp sensor or connector of 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 Outdoor unit display LED STATUS E5 Compressor volt protection Check the voltage of power supply if the voltage is about 220V turn off the power supply 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
7. the compressor will stop and restart till T5 90 C 6 5 3 Low voltage protection VOLTAGE No limit VOLLIMT1 VOLFRE1 VOLREL2 VOLLIMT2 VOLFRE2 VOLREL3 VOLLIMT3 Off Y Model VOLLIMT1 VOLLIMT2 VOLLIMT3 VOLREL1 VOLREL2 VOLREL3 VOLFRE1 VOLFRE2 230 200 120 260 210 135 62 54 M 3 245 220 120 265 240 135 78 45 POM365HX 200 185 120 210 195 135 54 42 Note if the low voltage protection occurs and not resumes within 3min it will keep the protection always after restart the machine 6 5 4 Compressor current limit protection If the compressor current exceeds the current limit value for 10 seconds the compressor frequency will be limited as below table Cooling mode Current frequency Hz Current limit value A Frequency limit COOL_F10 ICOOLLMT6 COOL_F9 ICOOLLMT5 COOL F8 ICOOLLMT4 COOL_F7 ICOOLLMT3 COOL_F6 ICOOLLMT2 COOL_F5 ICOOLLMT1 Decrease the frequecny to COOL F4 and run at COOL _F4 for minutes After that the frequency will be adjusted according to the capacity demand and rise to the upper level every 3 minutes When the frequency COOL F4 via capacity demand If the current frequency is lower than COOL F4 the frequency will not be limited After 10s of the compressor start if the current gt ICOOL the AC will display the failure for 30 seconds and stop The AC will restart 3 minutes later Heating mode
8. Current frequency Hz Current limit value A Frequency limit HEAT F12 IHEATLMT8 HEAT F11 IHEATLMT7 HEAT F10 IHEATLMT6 HEAT F9 IHEATLMTS HEAT F8 IHEATLMT4 Decrease the frequency to HEAT F4 and run at HEAT F4 for 3 minutes After that the frequency will be adjusted according to the capacity demand and rise to the upper level every 3 minutes HEAT F7 IHEATLMT3 When the frequency Heat F4 via capacity demand HEAT F6 IHEATLMT2 HEAT F5 IHEATLMT1 If the current frequency is lower than HEAT FA the frequency will not be limited After 10s of the compressor start if the current gt IHEAT the AC will display the failure for 30 seconds and stop The AC will restart 3 minutes later 6 5 5 Indoor outdoor units communication protection If the indoor units can not receive the feedback signal from the outdoor units for 2 minutes the AC will stop and display the failure 6 5 6 High condenser coil temp protection When T3 gt 65 C for seconds the compressor will stop while the indoor fan and outdoor fan will continue When 3 lt 52 the protection will release and the compressor will restart after 3 minutes 6 5 7 Outdoor unit anti freezing protection When T2B 0 for 250 seconds the indoor unit capacity demand will be zero and resume to normal when T2B gt 10 C 6 5 8 Oil return Running rules 1 If the compressor frequency keeps lower than RECOILI
9. Forward Resistance Backward Resistance T uM Infinite Infinite 500 ohm Infinite 500 ohm Infinite
10. last error or protection code 00 means no malfunction 20 frequency value Actual data 21 Ambient temp of 1 indoor unit Actual data 22 Condenser pipe temp of 1 indoor unit Actual data 23 Ambient temp of 2 indoor unit Actual data 24 Condenser pipe temp of 2 indoor unit Actual data 25 Ambient temp of 3 indoor unit Actual data 26 Condenser pipe temp of 3 indoor unit Actual data 27 Ambient temp of 4 indoor unit Actual data 28 Condenser pipe temp of 4 indoor unit Actual data 29 Check point over The following items from 6 4 1 to 6 4 6 are for the explanation of the point check functions 6 4 1 Frequency of compressor Display Frequency of compressor Hz 30 30 Stand by 60 60 6 4 2 Running mode Display Corresponding mode 0 Off 1 Cooling mode 2 Heating mode 6 4 3 Capacity demand Cooling mode Capacity 2000 2 2000 2 3000 3 4500 5 5000 5 5500 6 6100 7 7000 7 7500 8 gt 7500 500 500 800 000 500 100 000 500 000 Correspondi 1 2 3 4 5 6 7 8 9 gt 10 ng Code Heating mode Capacity 2000 2 2000 2 3000 3 4500 5 5500 6 6100 7 6100 7 7000 7 7500 8 gt 8000 500 500 800 000 100 000 000 500 000 Correspondin 1 2 3 4 5 6 7 8 9 10 gt 11 g Code Note The capacity is just for reference 6 4 4Number of indoor unit
11. voltage 12 14V AC No Replace the outdoor power board Outdoor unit display LED STATUS E7 outdoor units communication protection Is the LED in outdoor main PCB light Check the signal wires between outdoor PCBs is it connected good 1 15 the 5 voltage in outdoor main board Power Board CN4 Red wire and yellow GND Outdoor main PCB CZ1 2 15 the 3 3v 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 D and N 310V DC Check the IC6 IC7 at Outdoor power PCB Normally Input voltage 5V changeable Output voltage 5V changeable Outdoor power PCB is defective Outdoor unit display LED STATUS PO Compressor top protection against temperature Off 105c On 90c The trouble shooting is same with the one of indoor unit P2 protection Outdoor unit display LED STATUS P3 Compressor current protection Check the resistance of compressor normally U and V is 1 ohm U and W is 1 ohm V and W is 1ohm The compressor is defective Turn one indoor unit only Does the compressor start after No 3 minutes Yes Rec pom The compressor is defective Does the trouble occur again after compressor running some time Check the refrigerant circulation volume and pressure Yes If refrigerant cir
12. EPROM error Circuit or software error on indoor PCB Replace indoor PCB Indoor unit display LED STATUS E1 outdoor communication error Disconnect the power supply after 1 minute connect the power supply turn on the unit with remote controller Does the unit work normally Check the wiring between indoor and outdoor unit Is the connection of L N S and GND good Is the GND connection on outdoor PCB good NO Reconnect and retest again Is the LED4 red on outdoor PCB bright and LED yellow blinking Replace indoor PCB and repower on Is the failiire cleared The power supply for outdoor PCB is fail Check the wiring on outdoor PCB comparing with wiring plate Is the connection good Correct the connection Replace outdoor e box Indoor unit display LED STATUS E2 Zero crossing examination error Is power supply and connection of connectors aood Be sure the power supply is good and correct the connection Indoor PCB is defective Replace the indoor PCB Indoor unit display LED STATUS E3 Fan speed beyond control Is the indoor fan motor Repair th d epair the connector connector and connection p t good reconnec Is voltage being applied to the fan motor Indoor PCB is defective rang 90v 160v
13. NFRE for 2hours the AC will rise the frequency to RECOILFRE for 3mins and then resume to former frequency Model RECOILINFRE POM182HX 45 POM273HX 45 POM365HX 40 2 During the oil return process the EXV and indoor units keep the current running mode the frequency will not be limited by the compressor discharge temp and the current 6 5 9 Compressor preheating functions Preheating permitting condition If T4 outdoor ambient temperature 3 C and newly powered on or if T4 3 C 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 compressor then the compressor is heated without operation Preheating release condition If T4 gt 5 C or the compressor starts running preheating function will stop 6 5 10 Compressor crankcase heater When T4 lt 3 C and the compressor is not running the crankcase heater will be active When T4 5 C or the compressor starts up the crankcase heater will stop work For MSOA 36HRDN1 Q T4 28 7 Troubleshooting 7 1 Indoor unit error code explanation Vertu series Display LED STATUS EO EEPROM error E1 Communication error between indoor and outdoor unit E2 Zero crossing examination error E3 Fan speed beyond control E5 Outdoor units temp sensor or connector of temp sensor is defective
14. ays between running frequency and dF each displays 2s In compressor pre heating The LED displays e n protection or malfunction the LED displays error code or protection code 6 4 Outdoor unit point check function There is a check switch in outdoor PCB Push the switch SW1 to check the states of unit when the unit is running The digital display tube will display the follow procedure when push SW1 each time Display Remark 1 Indoor unit capacity demand code 2 Outdoor unit running mode code Off 0 Cooling 1 Heating 2 3 Amendatory capacity demand code 4 Outdoor unit fan motor state Off 0 Low speed 1 High speed 2 5 Evaporator outlet temp for 1 indoor unit Actual data 6 Evaporator outlet temp for 2 indoor unit Actual data 7 Evaporator outlet temp for 3 indoor unit Actual data 8 Evaporator outlet temp for 4 indoor unit Actual data 9 Condenser pipe temp Actual data 10 Ambient temp Actual data 11 Compressor discharge temp Actual data 12 Inverter current Actual data 13 EXV open angle for 1 indoor unit Actual data divide 8 14 EXV open angle for 2 indoor unit Actual data divide 8 15 EXV open angle for 3 indoor unit Actual data divide 8 16 EXV open angle for 4 indoor unit Actual data divide 8 17 Power supply of outdoor unit AD data 18 Indoor unit number The indoor unit can communicate with outdoor unit well 19 The
15. between Replace the indoor PCB mid pin and N on CN1 Replace the indoor fan motor Indoor unit display LED STATUS E5 Outdoor units temp sensor or connector of temp sensor is defective Is the outdoor temperature A Sensor connector vand Repair the connector and connection aood reconnect Replace the Sensor and Replace outdoor e box check if E5 display again Indoor unit display LED STATUS E6 Indoor units temp sensor or connector of temp sensor is defective Is the indoor temperature and evaporator sensor connector and connection good Replace the sensor and check if E6 display again Repair the connector and reconnect Replace the indoor PCB Indoor unit display LED STATUS PO Inverter module protection NO Is voltage normal NO Is all connection good Is the wiring to compressor right lt lt m m n n Check the modular if some components blow out or be failure YES YES Is it breakdown between P N P V P W N V N W or V W of inverter moduler YES YES Revise the power and retest Revise the power and retest Repair or replace the modular Replace the modular Check the compressor Indoor unit display LED STATUS P1 Outdoor voltage protection Is the power supply good Be sure the power supply is normal wh
16. culation volume and pressure is OK change the outdoor main PCB Outdoor unit display LED STATUS P4 Compressor drive malfunction drive protection arose Are the U V W connected to compressor and inverter module right Yes Replace the outdoor power board No pair connector If the problem comes to again check wingding resistance of inverter compressor is it 1 ohm No Replace inverter compressor Outdoor unit display LED STATUS PA LED flashes for nine times Compressor drive malfunction module protection arose Are the U V W connected to compressor and inverter module Yes No Replace the module to see if it is normal Replace the outdoor power board If the problem comes to again check wingding resistance of inverter compressor is it right No Replace inverter compressor Outdoor unit 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 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 Annex 1 Characteristic of temp sensor Resistance Resistance Resistance
17. en usina the units Replace the outdoor e box Indoor unit display LED STATUS P2 Compressor top protection against temperature YES Is refrigerant circulation volume normal Charge refrigerant Is abnormality the same after aas charaina Does compressor nnarata Is the connection good YES Reconnect and retest Replace the protector Is protector normal Check the outdoor main PCB Is there some Replace the outdoor Check refrigerant such as cloaaina of capillarv System Indoor unit display LED STATUS P3 Compressor current protection The trouble shooting is same with one of outdoor unit P3 protection 8 4 1 Outdoor unit trouble shooting Outdoor unit display LED STATUS EO EEPROM error Circuit or software error on indoor Replace indoor Outdoor unit display LED STATUS E1 No 1 Indoor units pipe temp sensor or connector of pipe temp sensor is defective Check the resistance of the temp sensor according to Annex 1 Replace the sensor Is connection to connector of pipe temp sensor good Repair connector Outdoor unit display LED STATUS E2 No 2 Indoor units pipe temp sensor or connector of pipe temp sensor is defective Yes Replace the sensor
18. er 2 Dimensions a 1075 390 3 Wiring Diagram 3 1 ELECTRONIC ELECTRONIC EXPANSIVE COMPRESSOR SCHARGE RECTIFILER2 RECTIFILIRT RID RI325 RED R1502 EXPANSIVE VALVE B VALVE B MAIN BOARD ELECTRONIC EXPANSIVE r COMPRESSOR MIEN t SENSOR DISCE ut nic RUE RED fex RECTIFILER REGTIFILERI MD 0325 RD BLUE BLACK ELECTRONIC ELECTRONIC EXPANSIVE EXPANSIVE VALVE 8 C 4 B BLACK YELLOW air MAIN BOARD MIE AO 2508 4 VALVE OPTIONAL ELECTRONIC ELECTRONIC ELECTRONIC ELECTRONIC EXPANSIVE EXPANSIVE EXPANSIVE EXPANSIVE VALVE A VALVE B VALVE C VALVE D COMPRESSOR COMPRESSOR TEMP PRO TEW ABCD PIPE OUT RECTIFILER2 FAN CAPACITOR PFC MODULE OPTIONAL 4 Refrigeration Cycle Diagram 4 1 Refrigeration circuit drawing of inverter binary type Exhaust temp sensor 4 way valve Compressor Exhaust temp sensor A N N VA 4 way valve Compressor Exhaust temp sensor Compressor Axial flow fan X Condenser Auxiliary Capilla Main i vite Capillary Check Coil te
19. mp Valve sensor Outdoor Unit 4 2 Refrigeration circuit drawing of inverter trinary type Axial flow fan X Auxiliary Capilla Main NA v A Capillary Check Condenser Coil temp Valve sensor Outdoor Unit 4 3 Refrigeration circuit drawing of inverter quadplex type EXVA co XS s SO Filter A_ Liquid valve A Capillary A KO Filter B Liquid valve VV VV VS IN Capillarv B Indoor pipe out temp sensor A Gas valve A Indoor pipe out temp Senso B Gas valve B Capillary A DEXVA Liquid valve A Capillary B N Liquid valve B Capillary xl Liquid valve C Filter C Indoor pipe out temp sensor A Gas valve A Indoor pipe out T temp sensor B Gas valve B Indoor pipe out temp sensor C Gas valve C Liquid valve A Capillary A EXV A Axial flow fan Auxiliary Filter A Capillary Main Capillary B EXVB Liquid valve B Capill AAG _ plan Filter B Check Capillary C Ex C Liquid valve C Condenser Coiltemp Valve AWA i PR sensor Capillary D EXVD Liquid valve D Filter D Indoor pipe out temp sensor A XP valve A 0 Indoor pipe out temp sensor B Gas valve B Indoor pipe out temp sensor C Gas valve C Outdoor Unit Indoor pipe out temp sensor D Gas valve D flow fan Evaporator Cross Indoor Unit flow Evaporator Cross
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