Technical service manual

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1 GD Midea Refrigeration Equipment Co.,Ltd ODMI-A-1202 MULTI SPLIT TYPE, HEAT PUMP AIR CONDITIONERS Technical service manual R410A Multi DC inverter 220~240V-1Ph-50Hz Outdoor units Models M2OC-14HRDN1 M2OC-14HRDN1-Q M2OC-18HRDN1 M2OC1-18HRDN1-Q M3OC1-21HRDN1-Q M3OC-27HRDN1 M3OC1-27HRDN1-Q M4OC-24HRDN1-Q M4OC1-27HRDN1-Q M4OC-27HRDN1 M4OC-36HRDN1-Q M5OA-36HRDN1-Q

2 CONTENTS 1. General information of Outdoor Units Features Dimensions Wiring Diagram Refrigeration Cycle Diagram Indoor units combination Electronic control function Troubleshooting... 24

3 1. General information of Outdoor Units Model name Dimension (mm) Net/Gross weight (kg) Compressor M2OC-14HRDN1 760*590*285 39/41 DA108X1C-20FZ3 M2OC-14HRDN1-Q 760*590*285 39/41 DA108X1C-20FZ3 M2OC-18HRDN1 845*700* /61.5 C-6RVN93H0N M2OC1-18HRDN1-Q 845*700* /57 DA130S1C-20FZ M3OC1-21HRDN1-Q 845*700*320 55/60 DA130S1C-20FZ M3OC-27HRDN1 845*700*320 59/62 C-6RZ146H1A M3OC1-27HRDN1-Q 845*700*320 57/60.5 DA150S1C-20FZ M4OC-24HRDN1-Q 845*700*320 56/60 DA150S1C-20FZ M4OC-27HRDN1 900*860*315 73/78 TNB220FLHMC-L M4OC1-27HRDN1-Q 900*860*315 73/78 DA250S2C-30MT M4OC-36HRDN1-Q ( ) M4OC-36HRDN1-Q ( ) M5OA-36HRDN1-Q ( ) M5OA-36HRDN1-Q ( ) 990*965*345 86/90 TNB306FPGM 990*965*345 86/90 TNB306FPGMC-L 990*965* /91 TNB306FPGM 990*965* /91 TNB306FPGMC-L

4 2. Features 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 heater

5 3. Dimensions More than 30cm More than 30cm More than 60cm (Service space Fence or obstacles More than 60cm More than 70cm MODEL W D H W1 A B M2OC-14HRDN1-Q M2OC-14HRDN M2OC-18HRDN M2OC1-18HRDN1-Q M3OC1-21HRDN1-Q M3OC-27HRDN M3OC1-27HRDN1-Q M4OC-24HRDN1-Q M4OC-27HRDN1 M4OC1-27HRDN1-Q M4OC-36HRDN1-Q M5OA-36HRDN1-Q

6 4. Wiring Diagram 4.1 M2OC-14HRDN1-Q 4.2 M2OC-14HRDN1

7 4.3 M2OC1-18HRDN1-Q 4.4 M3OC1-21HRDN1-Q M3OC1-27HRDN1-Q M3OC-27HRDN1

8 4.5 M2OC-18HRDN1 4.6 M4OC-24HRDN1-Q

9 4.7 M4OC1-27HRDN1-Q M4OC-27HRDN1 4.8 M4OC-36HRDN1-Q

10 4.9 M5OA-36HRDN1-Q

11 5. Refrigeration Cycle Diagram 5.1 Refrigeration circuit drawing of inverter binary type 4.2 Refrigeration circuit drawing of inverter trinary type 5.3 Refrigeration circuit drawing of inverter quadplex type

12 5.4 Refrigeration circuit drawing of inverter quintuple type

13 6. Indoor units combination 6.1 Indoor unit combination for M2OC-14HRDN1-Q M2OC-14HRDN1 One unit Two unit te: There should be no more than one cassette or duct or console or ceiling & floor unit. 6.2 Indoor unit combination for M2OC1-18HRDN1-Q M2OC-18HRDN1 One unit Two unit te: The 18k indoor unit should only be wall mounted unit. 6.3 Indoor unit combination for M3OC1-21HRDN1-Q One unit Two unit Three unit te: There should be no more than one cassette or duct or console or ceiling & floor unit. And the 18k indoor unit should only be wall mounted unit. 6.4 Indoor unit combination for M3OC1-27HRDN1-Q M3OC-27HRDN1 One unit Two unit Three unit te: The 18k indoor unit should only be wall mounted unit. 6.5 Indoor unit combination for M4OC-24HRDN1-Q One unit Two unit Three unit Four unit te: The 18k indoor unit should only be wall mounted unit.

14 6.6 Indoor unit combination for M4OC1-27HRDN1-Q M4OC-27HRDN1 One unit Two unit Three unit Four unit Indoor unit combination for M4OC-36HRDN1-Q One unit Two unit Three unit Four unit Indoor unit combination for M5OA-36HRDN1-Q One Unit Two Unit Three Unit Four Unit Five Unit

15 7. Electronic control function 7.1 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. 7.2 Electric Control working environment Input voltage: 190~264V Input power frequency:50hz Indoor fan normal working amp. is less than 1A Outdoor fan. rmal working amp. is less than 1.5A Four-way valve normal working amp. is less than 1A Swing motor: DC12V. 7.3 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 - - In compressor operation, the LED display the running frequency, In defrosting mode, The LED displays df or alternative displays between running frequency and df (each displays 2s) In compressor pre-heating, The LED displays - - In protection or malfunction, the LED displays error code or protection code. 7.4 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. For units except M5OA-36HRDN1-Q model: Display 1 Indoor unit capacity demand code Remark 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

16 13 EXV open angle for 1# indoor unit Actual data/8 14 EXV open angle for 2# indoor unit Actual data/8 15 EXV open angle for 3# indoor unit Actual data/8 16 EXV open angle for 4# indoor unit Actual data/8 17 Power supply of outdoor unit AD data 18 Indoor unit number The indoor unit can communicate with outdoor unit well. 19 The 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 For M5OA-36HRDN1-Q model: Display Remark 1. of indoor units in good connection Actual data 2 Outdoor unit running mode code Off:0, Cooling:2, Heating:3, Forced cooling:4 3 A indoor unit capacity 4 B indoor unit capacity 5 C indoor unit capacity 6 D indoor unit capacity 7 E indoor unit capacity 8 A Indoor unit capacity demand code 9 B Indoor unit capacity demand code 10 C Indoor unit capacity demand code 11 D Indoor unit capacity demand code 12 E Indoor unit capacity demand code 13 Total indoor units amendatory capacity demand code 14 The frequency corresponding to the total indoor units amendatory capacity demand 15 The frequency after the frequency limit 16 The frequency sending to compressor control chip 17 A indoor unit evaporator outlet temp.(t 2BA) 18 B indoor unit evaporator outlet temp.(t 2BB) 19 C indoor unit evaporator outlet temp.(t 2BC) 20 D indoor unit evaporator outlet temp.(t 2BD) 21 E indoor unit evaporator outlet temp.(t 2BE) 22 A indoor unit room temp.(t 1A) 23 B indoor unit room temp.(t 1B) 24 C indoor unit room temp.(t 1C) 25 D indoor unit room temp.(t 1D) 26 E indoor unit room temp.(t 1E) The capacity unit is horse power. If the indoor unit is not connected, the digital display tube will show: If the temp. is lower than -9 degree, the digital display tube will show -9.If the temp. is higher than 70 degree, the digital display tube will show 70. If the indoor unit is not connected, the digital display tube will show:

17 27 A indoor unit evaporator outlet temp.(t 2BA) 28 B indoor unit evaporator outlet temp.(t 2BB) 29 C indoor unit evaporator outlet temp.(t 2BC) 30 D indoor unit evaporator outlet temp.(t 2BD) 31 E indoor unit evaporator outlet temp.(t 2BE) 32 Condenser pipe temp.(t3) 33 Outdoor ambient temp.(t4) If the temp. is lower than -9 degree, the digital display tube will show -9.If the temp. is higher than 70 degree, the digital display tube will show 70. If the indoor unit is not connected, the digital display tube will show: 34 Compressor discharge temp.(tp) The display value is between 30~120 degree. If the temp. is lower than 30 degree, the digital display tube will show 30.If the temp. is higher than 99 degree, the digital display tube will show single digit and tens digit. For example, the digital display tube show 0.5,it means the compressor discharge temp. is 105 degree.) 35 AD value of current 36 AD value of voltage The display value is hex number. 37 EXV open angle for A indoor unit 38 EXV open angle for B indoor unit 39 EXV open angle for C indoor unit 40 EXV open angle for D indoor unit 41 EXV open angle for E indoor unit 42 Frequency limit symbol Actual data/4. If the value is higher than 99, the digital display tube will show single digit and tens digit. For example,the digital display tube show 2.0,it means the EXV open angle is 120 4=480p.) Bit7 0 The display value is hex Bit6 0 number. For Bit5 Frequency limit caused by T4. example, the digital display Bit4 Frequency limit caused by T2. tube show Bit3 Frequency limit caused by T3. 2A,then Bit5=1, Bit3=1, Bit1=1. Bit2 Frequency limit caused by Tp. It means frequency limit Bit1 Frequency limit caused by current caused by T4,T3 and Bit0 Frequency limit caused by voltage current. 43 Average value of T2 (Sum T2 value of all indoor units)/(indoor units number) 44 Outdoor unit fan motor state Off:0, High speed:1, Med speed:2, Low speed:3 45 The last error or protection code 00 means no malfunction Frequency of compressor: Display Frequency of compressor (Hz) Stand by Running mode: Display Corresponding mode 0 Off 1 Cooling mode 2 Heating mode

18 7.4.3 Capacity demand: Cooling mode Capacity Correspondi ng Code Heating mode Capacity Correspondin g Code > >= te: The capacity is just for reference > >=11

19 7.4.4Number of indoor unit Display Number of indoor unit Outdoor ambient temp: Display Corresponding temp. Display Corresponding temp. Display Corresponding temp ~ ~ ~ ~ ~ ~ ~

20 7.4.6 Opening degree of electronic expansion valve: Opening degree equals the display data times Protection Three minutes delay at restart for compressor Temperature protection of compressor discharge. rules: When the compressor discharge temp. is getting higher, the running frequency will be limited as below ----If 102 <T5<115, decrease the frequency to the lower level every 2 minutes till to F1. ---If T5>115 for 10 seconds, the compressor will stop and restart till T5< Under voltage protection VOLTAGE limit VOLREL1 VOLLIMT1 VOLLIMT2 VOLLIMT3 VOLFRE1 VOLFRE2 Off VOLREL2 VOLREL3 Mode VOLLIMT1(V) VOLLIMT2(V) VOLLIMT3(V) VOLREL1(V) VOLREL2(V) VOLREL3(V) VOLFRE1(Hz) VOLFRE2(Hz) M2OC-14HRDN M2OC-14HRDN1-Q M2OC-18HRDN M2OC1-18HRDN1-Q M3OC1-21HRDN1-Q M3OC-27HRDN M3OC1-27HRDN1-Q M4OC-24HRDN1-Q M4OC-27HRDN M4OC1-27HRDN1-Q M4OC-36HRDN1-Q For M5OA-36HRDN1-Q, VOLTAGE limit VOLT_RST1_ADD VOLT_LTM1_ADD VOLT_LTM_FREQ1_ADD VOLT_RST2_ADD VOLT_LTM2_ADD VOLT_LTM_FREQ2_ADD

21 VOLT_RST1_ADD=210V, VOLT_LIM1_ADD=200V, VOLT_RST2_ADD=195V, VOLT_LIM2_ADD=185V. VOLT_LIM_FREQ1_ADD=54Hz, VOLT_LIM_FREQ2_ADD=42Hz 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. For models except M5OA-36HRDN1-Q. Cooling mode: Current frequency(hz) Current limit value(a) Frequency limit COOL_F10 ICOOLLMT6 Decrease the frequency to COOL_F4 and COOL_F9 ICOOLLMT5 run at COOL_F4 for 3 minutes. COOL_F8 COOL_F7 COOL_F6 COOL_F5 ICOOLLMT4 ICOOLLMT3 ICOOLLMT2 ICOOLLMT1 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>icool, the AC will display the failure for 30 seconds and stop. The AC will restart 3 minutes later. Heating mode: Current frequency(hz) Current limit value(a) Frequency limit HEAT_F12 IHEATLMT8 Decrease the frequency to HEAT_F4 and HEAT_F11 IHEATLMT7 run at HEAT_F4 for 3 minutes. HEAT_F10 HEAT_F9 HEAT_F8 HEAT_F7 HEAT_F6 HEAT_F5 IHEATLMT6 IHEATLMT5 IHEATLMT4 IHEATLMT3 IHEATLMT2 IHEATLMT1 After that, the frequency will be adjusted according to the capacity demand and rise to the upper level every 3 minutes (When the frequency>heat_f4 via capacity demand). If the current frequency is lower than HEAT_F4, the frequency will not be limited. After 10s of the compressor start, if the current>iheat, the AC will display the failure for 30 seconds and stop. The AC will restart 3 minutes later. For M5OA-36HRDN1-Q model: Cooling mode: Current (Hz) frequency Current limit value(a) Frequency limit COOL_F16 ICOOLLMT12 Decrease the frequency to COOL_F4 and run at COOL_F15 ICOOLLMT11 COOL_F4 for 3 minutes. COOL_F14 COOL_F13 COOL_F12 COOL_F11 COOL_F10 ICOOLLMT10 ICOOLLMT9 ICOOLLMT8 ICOOLLMT7 ICOOLLMT6 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).

22 COOL_F9 COOL_F8 COOL_F7 COOL_F6 COOL_F5 ICOOLLMT5 ICOOLLMT4 ICOOLLMT3 ICOOLLMT2 ICOOLLMT1 If the current frequency is lower than COOL_F4, the frequency will not be limited. After 10s of the compressor start, if the current>icool, the AC will display the failure for 30 seconds and stop. The AC will restart 3 minutes later. Heating mode: Current frequency Current limit value(a) Frequency limit (Hz) HEAT_F16 HEAT_F15 IHEATLMT12 IHEATLMT11 Decrease the frequency to HEAT_F4 and run at HEAT_F4 for 3 minutes. HEAT_F14 HEAT_F13 HEAT_F12 HEAT_F11 HEAT_F10 HEAT_F9 HEAT_F8 HEAT_F7 HEAT_F6 HEAT_F5 IHEATLMT10 IHEATLMT9 IHEATLMT8 IHEATLMT7 IHEATLMT6 IHEATLMT5 IHEATLMT4 IHEATLMT3 IHEATLMT2 IHEATLMT1 After that, the frequency will be adjusted according to the capacity demand and rise to the upper level every 3 minutes (When the frequency>heat_f4 via capacity demand). If the current frequency is lower than HEAT_F4, the frequency will not be limited. After 10s of the compressor start, if the current>iheat, the AC will display the failure for 30 seconds and stop. The AC will restart 3 minutes later 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 High condenser coil temp. protection. When T3>65 for 3 seconds, the compressor will stop while the indoor fan and outdoor fan will continue. When T3<52, the protection will release and the compressor will restart after 3 minutes 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> Oil return Running rules:

23 1. If the compressor frequency keeps lower than RECOILINFRE for Te minutes, the AC will rise the frequency to RECOILFRE for Tf seconds and then resume to former frequency. For M4OC-36HRDN1-Q, RECOILINFRE=45Hz, RECOILFRE=48Hz,Te=120,Tf=180; For M5OA-36HRDN1-Q, RECOILINFRE=45Hz, RECOILFRE=48Hz, Te=90,Tf=100; For other models, RECOILINFRE=50Hz, RECOILFRE=62Hz, Te=120,Tf= During the Tf seconds, the EXV and indoor units keep the current running mode(except M5OA-36HRDN1-Q model), the frequency will not be limited by the compressor discharge temp. and the current. For M5OA-36HRDN1-Q model, the EXV will keep 300p while the indoor units will keep the current running mode. 3. If the outdoor ambient is higher than 15 during the oil return, the AC quit oil return Compressor preheating functions ----Preheating permitting condition: If T4(outdoor ambient temperature)<3 and the machine connects to power supply no longer than 5 seconds or if T4<3 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 5 or the compressor starts running, preheating function will stop Compressor crankcase heater When T4<3 and the compressor is not running, the crankcase heater will be active. When T4 5 or the compressor starts up, the crankcase heater will stop work.(for M5OA-36HRDN1-Q,T4 8 )

24 8. Troubleshooting 8.1 Indoor unit error code explanation: Glory series NO. MALFUNCTION DEF TIMER AUTO RUN 1 Indoor EEPROM malfunction O O O O 2 Indoor / outdoor units communication error 3 Zero-crossing signal error O O 4 Indoor fan speed has been out of control O O 5 Open circuit or short circuit of outdoor temperature sensor X O X 6 Open circuit or short circuit of T1 or T2 temperature sensor O O O 8 IPM module protection or IGBT over-strong current protection X X O 9 Over voltage or too low voltage protection X O O 10 Temperature protection of compressor top O X X 11 Inverter compressor drive protection O X 12 Mode conflict X O Flash(at 0.5Hz, Mode conflict at 0.25Hz) O light X(off) 9V series+vertu series+9a series+corona series+ R series+y series+ X series Display E0 E1 E2 E3 E5 E6 P0 P1 P2 P4 P5 LED STATUS Indoor EEPROM malfunction Indoor/ outdoor units communication error Zero-crossing signal error Indoor fan speed has been out of control Open circuit or short circuit of outdoor temperature sensor Open circuit or short circuit of T1 or T2 temperature sensor IPM module protection or IGBT over-strong current protection Over voltage or too low voltage protection Temperature protection of compressor top Inverter compressor drive protection Mode conflict NEOLA series +PREMIER series +OASIS series: Display Operation lamp flash times Timer lamp Failure E0 1 X Indoor EEPROM malfunction E1 2 X Indoor / outdoor units communication error E2 3 X Zero-crossing signal error E3 4 X Indoor fan speed has been out of control E4 5 X Open or short circuit of T1 temperature sensor E5 6 X Open or short circuit of T2 temperature sensor F1 2 O Open or short circuit of T4 temperature sensor

25 F2 3 O Open or short circuit of T3 temperature sensor F3 4 O Open or short circuit of T5 temperature sensor F4 5 O Outdoor EEPROM malfunction F6 7 O Open or short circuit of T2B temperature sensor P0 1 IPM module protection or IGBT over-strong current protection P1 2 Over voltage or too low voltage protection P2 3 Temperature protection of compressor top P4 5 Inverter compressor drive protection P5 6 Mode conflict O (light) X (off) (flash) Cassette series: Operation Timer De-frost Alarm LED STATUS X X X Open or short circuit of T1 temperature sensor X X X Open or short circuit of T2 temperature sensor X X X Indoor / outdoor units communication error X X X Full-water malfunction X X Indoor EEPROM malfunction X X IPM module protection X X Open or short circuit of T3 or T4 temperature sensor X Outdoor voltage protection Temperature protection of compressor top X Mode conflict X Inverter compressor drive protection Ceiling &Floor series: flash, light, X extinguished. Operation Timer De-frost Alarm LED STATUS X X X Open or short circuit of T1 temperature sensor X X X Open or short circuit of T2 temperature sensor X X X Indoor / outdoor units communication error X X X Full-water malfunction X X Indoor EEPROM malfunction X X IPM module protection X X Open or short circuit of T3 or T4 temperature sensor X Outdoor voltage protection X X Temperature protection of compressor top X Mode conflict flash, light, X extinguished.

26 A5 Duct series: Operation Timer De-frost Alarm LED STATUS DISPLAY DIGITAL TUBE X X X Open or short circuit of T1 temperature sensor E0 X X X Open or short circuit of T2 temperature sensor E1 X X X Indoor / outdoor units communication error E2 X X X Full-water malfunction E3 X X Indoor EEPROM malfunction E4 X X IPM module protection E5 X X Open or short circuit of T3 or T4 temperature sensor X Outdoor voltage protection P0 Temperature protection of compressor top P3 X X Inverter compressor drive protection P4 X X Mode conflict P5 flash at 5Hz, light, X extinguished flash at 0.5Hz E6 Console series: Operation Timer De-frost LED STATUS X X Open or short circuit of T1 temperature sensor X X Open or short circuit of T2 temperature sensor X X Indoor / outdoor units communication error X Indoor EEPROM malfunction X IPM module protection Open or short circuit of T3 or T4 temperature sensor X Top temperature protection of compressor X Inverter compressor drive protection X Mode conflict Indoor fan speed has been out of control flash at 5Hz, light, X extinguished

27 Outdoor unit error code explanation: For units(except M5OA-36HRDN1-Q model) Display LED STATUS E0 E1 E2 E3 E6 E4 E5 E7 Outdoor EEPROM malfunction A Indoor unit coil outlet temp. sensor or connector of sensor is defective B Indoor unit coil outlet temp. sensor or connector of sensor is defective C Indoor unit coil outlet temp. sensor or connector of sensor is defective D Indoor unit coil outlet temp. sensor or connector of sensor is defective Open or short circuit of outdoor unit temperature sensor Compressor voltage protection Communication malfunction between IPM board and outdoor main board Temperature protection of compressor discharge or compressor top. P0 For M4OC-27HRDN1, M4OC1-27HRDN1-Q,M4OC-36HRDN1-Q,it only means Temperature protection of compressor discharge P1 P2 P3 P4 P6 P7 High pressure protection(only for M4OC1-27HRDN1-Q, M4OC-27HRDN1-Q,M4OC-36HRDN1-Q) Low pressure protection(only for M4OC1-27HRDN1-Q, M4OC-27HRDN1-Q,M4OC-36HRDN1-Q) Current protection of compressor IPM module protection High temperature protection of condenser Inverter compressor drive protection

28 For M5OA-36HRDN1-Q model Display LED STATUS E0 E2 E3 E4 E5 E6 F1 F2 F3 F4 F5 P1 P2 P3 P4 P5 P6 Outdoor EEPROM malfunction Indoor / outdoor units communication error Communication malfunction between IPM board and outdoor main board Open or short circuit of outdoor unit temperature sensor Compressor voltage protection PFC module protection A Indoor unit coil outlet temp. sensor or connector of sensor is defective B Indoor unit coil outlet temp. sensor or connector of sensor is defective C Indoor unit coil outlet temp. sensor or connector of sensor is defective D Indoor unit coil outlet temp. sensor or connector of sensor is defective E Indoor unit coil outlet temp. sensor or connector of sensor is defective High pressure protection Low pressure protection Current protection of compressor Temperature protection of compressor discharge High temperature protection of condenser IPM module protection

29 8.3Trouble shooting For the indoor unit Indoor EEPROM malfunction

30 Indoor / outdoor units communication error Start: Power off, then Power on the A/C by the Breaker. (reconnect the power wire). Is E1 extinguish? Check wiring on the outdoor and indoor terminal follow the wiring diagram. Is all connecting correctly? Reconnect the wiring Reconnect the wiring Turn on all indoor unit by remote controller. Is all indoor unit display Measure Vs, is it moving alternately between positive value and negative value? (Vs is the voltage between S and L2). Refer PIC 1 Turn off the all indoor units. Is IPM power LED lamp On? Refer PIC 3 change IPM A: Is all the wiring between terminal and Indoor PCB connect ok? Is PFC power LED lamp off? Refer PIC 3. change PFC change the Indoor PCB Reconnect the wiring Power on by remote controller, Is the E1 extinguish after 3 minutes? Is Main board " lamp on? Refer PIC 4. Is the Reactor connection. Is indoor units number correct? Check on the outdoor check point (18). (2 for dual zone, 3 for tri zone, 4 for qua zone). Refer PIC 5. Change Outdoor Main PCB E1 error problem solved. The unit operation normally. fist time Change outdoor unit PCB assembly(include wiring) totally second time A

31 Pic 1: Measure the voltage of L2 to S (Vs), is it moving alternately between positive value and negative value? PIC 2, Check the wiring. PIC 3:IPM (For dual/tri/qua-zone) PFC (qua-zone only) Off is OK Power on Self-Check OK Operati PIC4 :Main board LED when power on and unit standby. PIC 5: check piont buttom, pess 18 times for check how many indoor units are connected.

32 Zero-crossing signal error Indoor fan speed has been out of control Shut off the power supply and turn it on 1 minute later. Is it still displaying the error code? The unit operates normally. S h u t o f f t h e p o w e r supply, rotate the cross fan by hand. Does it rotate properly? Disassembly the connection between fan and motor, check if the bearing is normal? Replace the bearing. Check the wires of fan motor. Are all the connections good? Correct the connections. Replace indoor fan motor. Check the resistance value of indoor fan motor, is it normal? Replace indoor PCB.

33 Open or short circuit of temperature sensor Full-water malfunction Full-water malfunction Check whether the water-level switch is inserted well Insert the water-level switch well Check whether the water-level switch is broken Replace the water-level switch Check whether the water pump is normal Replace the water pump Check PCB board or replace the indoor main PCB

34 8.3.2 For the outdoor unit Outdoor EEPROM malfunction Outdoor EEPROM malfunction If the EEPROM chip is welded on PCB, replace the PCB directly. Otherwise, check whether the EEPROM chip plugged in PCB well? Insert the EEPROM well Replace the outdoor main board

35 Voltage protection of compressor Voltage protection of compressor Check the voltage of outdoor unit power supply, whether the voltage between L(1) and N is about 220VAC Check the power supply Replace the power board, then check whether the system can run normally Trouble is solved Check whether the voltage of IPM board P and N is VDC Replace bridge rectifiers, then check whether the system can run normally Trouble is solved Replace IPM board Replace outdoor main board

36 Communication malfunction between IPM board and outdoor main board Check whether the IPM board has error display Replace IPM board Insert the connecting wiring between the IPM module and the main board well over again Trouble is solved Replace the IPM board Trouble is solved Replace outdoor PCB Trouble is solved The problem is not resolved. Replace the electric control box

37 Temperature protection of compressor discharge Discharge temperature protection of compressor Check whether the compressor discharge temp. is more than 115 C? Check whether the wiring connection is right between compressor discharge temp. sensor and PCB according to wiring diagrams Correct the wiring connection Judge: The discharge temp. sensor is broken Check whether the refrigerant is leak Stop leaking and add refrigerant Method: Check whether the resistance of compressor discharge temp. sensor is right refer to the Appendix 2 Replace the compressor discharge temp. sensor Replace outdoor main board

38 Temperature protection of compressor top Temperature protection of compressor top Judge 1: Whether compressor operates? Whether the connection is good? Reconnect retest. and Judge 2: Whether refrigerant circulation volume is normal? Whether protector is normal? Replace the protector. Method: Charge refrigerant Check the outdoor main PCB. Is there some problem? Replace the outdoor main PCB Whether abnormality is the same after gas charging? Check refrigerant system (such as clogging of capillary etc.)

39 High pressure protection(for M4OC1-27HRDN1-Q, M4OC-27HRDN1-Q,M4OC-36HRDN1-Q, M5OA-36HRDN1-Q) High pressure protection Judge 1: Whether the wiring between the high pressure switch and main control board is connected well or correctly Connect it well Judge 2: Whether the high pressure switch is broken Method: Short connect the high pressure switch socket, check whether the system can run normally Replace high pressure switch Check whether the refrigerant system is ok Judge 3: Check whether the outdoor ambient temperature is too high Stop the unit Judge 4: Check whether the outdoor unit is bad ventilation Make the outdoor unit ventilate well Judge 5: Check whether the heat exchanger is dirty Clean the heat exchanger Judge 6: Check whether the refrigerant pipe is blocked Let the refrigerant out, then use the high pressure nitrogen or refrigerant to blow pipe, vacuumize and charge the refrigerant again Replace outdoor main board

40 Low pressure protection (For M4OC1-27HRDN1-Q, M4OC-27HRDN1-Q,M4OC-36HRDN1-Q, M5OA-36HRDN1-Q) Low pressure protection Judge 1: The wiring between the low pressure switch and main control board is connected well or correctly Connect it well Judge 2: Whether the low pressure switch is broken Method: Short connect the low pressure switch socket, check whether the system can run normally Replace low pressure switch Check whether the refrigerant system is ok Judge 3: Check whether the outdoor ambient temperature is too low Stop the unit Judge 4: The refrigerant of the system is leakage Method: Connect the pressure gauge to the gauge joint of the system, check whether the pressure is lower than 0.14MPa Leak hunting: Charge nitrogen or refrigerant to the system, if the leakage is serious, there will be distinct gas leakage cici sound; if the leakage is slight, use the suds (mixture of water and abluent is also ok if it can make bubble) or electronic leak detector. Judge 5: The refrigerant pipe is blocked Let the refrigerant out, then use the high pressure nitrogen or refrigerant to blow pipe, vacuumize and charge the refrigerant again Replace outdoor main board

41 Current protection of compressor Current protection of compressor Judge 1: Check whether the input current of the power supply wire is more than 8.5A (For 18-21K, it is 15A..For 27K(1x3), it is 15A.For 27K(1x4), it is 18.5A, For 36K, it is 21.5A) Check whether the refrigerant system is ok Judge 2: Check whether the outdoor ambient temperature is too high Stop the unit Judge 3: Check whether the outdoor unit is bad ventilation Make the outdoor unit ventilate well Judge 4: Check whether the heat exchanger is dirty Clean the heat exchanger Judge 5: The refrigerant pipe is blocked Let the refrigerant out, then use the high pressure nitrogen or refrigerant to blow pipe, vacuumize and charge the refrigerant again Replace outdoor main board Trouble is solved The problem is not resolved. Replace the electric control box

42 IPM module protection IPM module protection Check whether the voltage range of P-N on IPM module is normal? DC V for 14-27KBtu/h; DC V for 36KBtu/h Check whether the input power supply is correct? V, 1N, 50Hz Regulate it to correct, then check whether the system can work normally? Check whether the connecting line between main board and the IPM module is connected tightly Connect it tightly, check ok or not? Check whether the power supply line is connected correctly and tightly Connect it correctly and tightly, check ok or not? Check whether the connecting line of the compressor is connected correctly or tightly Connect it well, check ok or not? Check whether the lines in E-part box are connected tightly Connect it tightly, check ok or not? Replace the IPM module, check whether the system can work normally? Check whether the single-phase bridge is normal? Use the multimeter to measure the resistance between each two terminals, check whether there is the condition that value of resistance is 0 Replace the single-phase bridge Trouble is solved Replace the main board, check whether the system can work normally? Trouble is solved Check whether the connecting line of every reactor is normal? If the line is broken, the resistance of the two ports is (models except for M5OA-36HRDN1-Q);Check whether the PFC module broken(for M5OA-36HRDN1-Q) Replace the connecting line or reactor or replace the PFC module Replace the compressor, check whether the system can work normally? Trouble is solved

43 High temperature protection of condenser 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. High temperature protection of condenser Check whether the condenser temperature is more than 65 C Check whether the resistance of condenser temp. sensor is correct refer to the Appendix 1 Replace the temperature sensor Replace outdoor main board Stop the unit Judge1: The outdoor temp. is too high Clean the heat exchanger Judge 2: Check whether the heat exchanger is dirty Let the refrigerant out, then use the high pressure nitrogen or refrigerant to blow pipe, vacuumize and charge the refrigerant again Judge 3: The refrigerant pipe is blocked

44 PFC module protection PFC module protection Check whether the connecting line between main board and the PFC module is connected tightly Connect it tightly, check normal or not Check whether the voltage between P and N of IPM module is VDC Replace the outdoor main board Check whether the inductance of PFC module is good? Replace the PFC module Replace the inductance Inverter compressor drive protection The trouble shooting is same with one of IPM module protection

45 Appendix 1 Temperature Sensor Resistance Value Table ( --K) K Ohm K Ohm K Ohm K Ohm

46 Appendix 2 Unit: ---K Discharge temp. sensor table B(25/50)=3950K R(90 )=5KΩ±3%

47 Appendix 3 1. Reference voltage data: a) Rectifier : Input : V(AC), output :310V(DC) b) Inverter module: U,V, W 3ph. Result U-V U-W V-W P-N V(AC) V(AC) V(AC) DC 310V 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 ~ ~1.7M ohm Infinite ~ + - ~ ~1.7M ohm Infinite ~

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