Heiko M2T050-D2 Service Manual
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Heiko M2T050-D2 Service Manual

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SERVICE MANUAL
Model M2T050-D2
WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or
Repair the product or products dealt with in this service information by anyone else could result in serious injury or death
Version V1
Date 2023-03-02

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  • Page 1 SERVICE MANUAL Model M2T050-D2 WARNING This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.

  • Page 2: Table Of Contents

    Contents Contents 1. Introduction .................... 1 2. Specifications ..................7 3. Sensors list .................... 8 4. Piping diagrams ..................9 5. Operation range ..................10 6. Printed Circuit Board Connector Wiring Diagram ......... 11 7. Functions and Control ................8. Dimensional drawings ................9.

  • Page 3: Introduction

    Introduction 1 Introduction 1.1 Model name explanation series 18000 BTU 1 outdoor by 2 indoor Multi Domestic air conditioner...
  • Page 4 Introduction 1.2 Safety Cautions Be sure to read the following safety cautions before conducting repair work. The caution items are classified into “Warning” and “Caution”. The “Warning” items are especially important since they can lead to death or serious injury if they are not followed closely. The “Caution” items can also lead to serious accidents under some conditions if they are not followed.
  • Page 5 Introduction Warning Do not repair the electrical components with wet hands . Working on the equipment with wet hands can cause an electrical shock Do not clean the air conditioner by splashing water. Washing the unit with water can cause an electrical shock.
  • Page 6 Introduction Warning Be sure to use an exclusive power circuit for the equipment, and follow the technical standards related to the electrical equipment, the internal wiring regulations and the instruction manual for installation when conducting electrical work. Insufficient power circuit capacity and improper electrical work can cause an electrical shock or fire. Be sure to use the specified cable to connect between the indoor and outdoor units.
  • Page 7 Introduction Do not install the equipment in a place where there is a possibility of combustible gas leaks. If a combustible gas leaks and remains around the unit, it can cause a fire. Be sure to install the packing and seal on the installation frame properly. If the packing and seal are not installed properly, water can enter the room and wet the furniture and floor.
  • Page 8 Introduction Check the grounding, and repair it if the equipment is not properly grounded. Improper grounding can cause an electrical shock. Be sure to measure the insulation resistance after the repair, and make sure that the resistance is 1 M ohm or higher.

  • Page 9: Specifications

    Specification 2 Specifications NOMINAL DISTRIBUTION SYSTEM VOLTAGE 220-240 NOMINAL CAPACITY and NOMINAL INPUT 09+09 n i l Capacity rated Btu/h 17060(5460-20135) 16380(4430-18430) Power Consumption(Rated) 1.34 Annual energy consumption 1400 ³ 12 single:2×10 TECHNICAL SPECIFICATIONS-UNIT Dimensions H*W*D 553×800×275 Packaged 625×908×405 H*W*D Dimensions Sound level ELECTRICAL SPECIFICATIONS...

  • Page 10: Sensors List

    Specification TECHNICAL SPECIFICATIONS-OTHERS Refrigerant type Refrigerant charge Refrigerant Maximum allowable distance 30(double) 20(single) circuit between indoor and outdoor Maximum allowable level difference Refrigerant control liquid 6.35 Piping connections 9.52 (external diameter) drain Heat insulation type Both liquid and Gas pipes Max.

  • Page 11: Piping Diagrams

    Pinping diagrams 4 Pinping diagrams 9.52CuT 6.35CuT 9.52CuT 6.35CuT Domes t ic air condi t ioner...

  • Page 12: Operation Range

    Operation range 5 Operation range Domestic air conditioner...

  • Page 13: Printed Circuit Board Connector Wiring Diagram

    Wiring diagram 6. Printed Circuit Board Connector Wiring Diagram Connectors PCB (1) Control PCB Connector for power N and L Connector for ground Connector for CN2,CN1 on the module board CN 8 CN10 Connector for four way valve coil CN17 Connector for electric expansion valves CN16 CN18...
  • Page 14 Wiring diagram PCB (2) Module PCB P (CN8) Connector for CN26,CN24 on the control board N (CN9) LO (CN4) Connector for reactor LI (CN3) AC_L(CN1) Connector for CN8,CN9 on the control board AC_N(CN2) CN5(U) Connector for the compressor CN6(V) CN7(W) CN10 Connector for the DC power 5V and 15V form the control PCB Connector for communicate between the control board and the module...
  • Page 15 wiring diagram PCB (1) Domestic air conditioner...
  • Page 16 wiring diagram PCB(2) Domestic air conditioner...
  • Page 17 Wiring diagram OUTDOOR WIRING DIAGRAM 0011506856 Compressor Condensor R(U) C(W) S(V) CN26 CN38 CN29 CN24 RJ45 DRAM AC-L AC-N 2U18: AC-L OUT MOUDLE 2U14: CN23 AC-N OUT CN11 MOUDLE CN22 COM B POWER CN10 COM A MOUDLE PCB OUTDOOR PCB CN11 CN12 AC-L OUT...

  • Page 18: Functions And Control

    Functions and control 7.Functions and Control 7.1 The control system of outdoor unit 7.1.1 The operation frequency of outdoor unit and its control 7.1.1.1 The operation frequency control of compresso r The operation frequency scope of compressor Mode Minimun operation frequency Maximun operation frequency 7.1.1.2 The starting of compressor When the compressor is started for the first time, it must be kept under the conditions of...
  • Page 19 Functions and control Refrigeration/dehumidification mode:: Serial No. Temperature scope Frequency limitation Wh_c<16 Max_hz1 37 HZ Wh_c<23 Max_hz2 45 HZ Wh_c<29 Max_hz3 56 HZ Wh_c<32 Max_hz4 63 HZ Wh_c<40 Max_hz5 90 HZ Wh_c<48 Max_hz4 90 HZ Wh_c>48 Max_hz5 90 HZ Remarks: the above are not only the maximum frequency limitations of the complete appliance which are affected by the environment, but also the maximum ability limitation of the system.
  • Page 20 Functions and control When the outdoor unit is shut down, the valve is opened completely for 2 minutes, and then begin initialization. The scope of refrigerationg valve 90-----480 steps The scope of heating valve 70-----480 steps The valves are adjusted according to the degree of superheat SHa.
  • Page 21 Functions and control Fgh_t1 Decreasing the frequency rapidly Fgh_t2 58℃ Fgh_t2 Fgh_t3 Fgh_t3 Fgh_t4 Fgh_t4 Fgh_t5 2 Normal N Decreasing at the speed of 1HZ/1 second P Decreasing at the speed of 1Hz/10 seconds Q Continue to keep the last-time instruction cycle R Increasing at the speed of 1Hz/10seconds Remarks: the outdoor unit 7.1.3.3...
  • Page 22 Functions and control 7.1.3.5 Antifreezing protection of the indoor heat exchanger When refrigerating/heating, prevent freezing. Tpg_indoor is the minimum value of the effective indoor unit (start it and it is in accord with the running state). 11 //ice_temp_3+5 8 //ice_temp_3+2 Keeping the frequency ice_temp_3 ice_temp_2...
  • Page 23 Functions and control 7.1.4.1 The ou tdoor fan control when refrigerating or dehumidifying In 3 minutes, the outdoor fan is After the compressor is started for 5 seconds, started according to the temperature conditions of the outdoor environment. Twh（℃） Twh <23℃ 23℃<Twh<29℃...
  • Page 24 Functions and control 7.1.5 The control of the outdoor electronic expansion valve When starting the compressor: the opening size of the valve must be guaranteed to have entered into the standard opening size, and then the compressor can be started. When refrigeration is in vain (the machine is shut down or is in the state of retrograde operation), the opening size of the expansion valve of the indoor unit is 5 steps;...
  • Page 25 Functions and control 7.2 Value of thermistor outdoor Unit Ambient Sensor, Defrosting Sensor, Pipe sensor R25 =10K 3% B25 /50 =3700K 3% Temp.( ) Max.(K ) Normal(K ) Min.(K ) Tolerance( ) 165.2170 147.9497 132.3678 -1.94 1.75 155.5754 139.5600 125.0806 -1.93 1.74 146.5609...
  • Page 26 Functions and control 37.4465 35.0144 32.7108 -1.41 1.33 35.6202 33.3552 31.2062 -1.38 1.31 33.8936 31.7844 29.7796 -1.36 1.29 32.2608 30.2968 28.4267 -1.34 1.28 30.7162 28.8875 27.1431 -1.32 1.26 29.2545 27.5519 25.9250 -1.29 1.24 27.8708 26.2858 24.7686 -1.27 1.22 26.5605 25.0851 23.6704 -1.25 1.20...
  • Page 27 Functions and control 5.3916 5.1308 4.8783 -1.37 1.33 5.2001 4.9430 4.6944 -1.41 1.36 5.0163 4.7630 4.5185 -1.45 1.40 4.8400 4.5905 4.3500 -1.49 1.44 4.6708 4.4252 4.1887 -1.53 1.47 4.5083 4.2666 4.0342 -1.57 1.51 4.3524 4.1145 3.8862 -1.61 1.55 4.2026 3.9686 3.7443 -1.65 1.59...
  • Page 28 Functions and control 1.2583 1.1448 1.0405 -3.43 3.15 1.2226 1.1113 1.0092 -3.48 3.19 1.1880 1.0789 0.9789 -3.53 3.24 1.1546 1.0476 0.9497 -3.58 3.28 1.1223 1.0174 0.9215 -3.64 3.33 1.0910 0.9882 0.8942 -3.69 3.37 1.0607 0.9599 0.8679 -3.74 3.42 1.0314 0.9326 0.8424 -3.80 3.46...
  • Page 29 Functions and control 9687.0270 8074.3787 6724.1389 -2.88 2.41 9057.2314 7564.2244 6311.6413 -2.87 2.41 8472.2852 7089.4741 5927.0206 -2.86 2.40 7928.7217 6647.4547 5568.2222 -2.84 2.39 7423.3626 6235.7109 5233.3554 -2.83 2.39 6953.2930 5851.9864 4920.6791 -2.82 2.38 6515.8375 5494.2064 4628.5894 -2.80 2.37 6108.5393 5160.4621 4355.6078 -2.79 2.37...
  • Page 30 Functions and control 691.3524 622.3161 559.6694 -2.16 1.96 656.8979 592.1831 533.3634 -2.14 1.95 624.3328 563.6604 508.4261 -2.12 1.93 593.5446 536.6540 484.7796 -2.10 1.92 564.4275 511.0760 462.3510 -2.09 1.90 536.9865 486.9352 441.1516 -2.07 1.89 511.0105 464.0500 421.0258 -2.05 1.87 486.4151 442.3499 401.9146 -2.03 1.86...
  • Page 31 Functions and control 89.0211 85.0614 81.2048 -1.18 1.15 85.4976 81.7908 78.1744 -1.15 1.12 82.1303 78.6615 75.2715 -1.13 1.10 78.9116 75.6668 72.4902 -1.10 1.08 75.8343 72.8004 69.8249 -1.08 1.06 72.8916 70.0561 67.2703 -1.05 1.03 70.0770 67.4283 64.8213 -1.03 1.01 67.3844 64.9115 62.4731 -1.00 0.99...
  • Page 32 Functions and control 18.5157 17.4166 16.3680 -2.02 1.93 17.9590 16.8769 15.8458 -2.06 1.96 17.4214 16.3564 15.3427 -2.10 2.00 16.9023 15.8542 14.8577 -2.15 2.04 16.4010 15.3696 14.3902 -2.19 2.08 15.9167 14.9020 13.9394 -2.23 2.12 15.4489 14.4506 13.5047 -2.27 2.16 14.9968 14.0149 13.0855 -2.32 2.19...

  • Page 33: Dimensional Drawings

    Dimensional drawing 8.Dimensional drawings 9.Center of gravity ● Domestic air conditioner...

  • Page 34: Service Diagnosis

    Service Diagnosis 10 Service Diagnosis 10.1 Caution for Diagnosis The operation lamp flashes when any of the following errors is detected. 1.When a protection device of the indoor or outdoor unit is activated or when the thermistor malfunctions, disabling equipment operation. 2.When a signal transmission error occurs between the indoor and outdoor units.In either case, conduct the diagnostic procedure described in the following pages.
  • Page 35 Service Diagnosis Error Codes and Description indoor display 10.4 Split board: LED1 light of outdoor PCB flash; All-in-one board: LED2 light of outdoor PCB flash OUTDOOR ERROR CODE FAULT DESCRIPTION SPARE PART (LED FLASH TIMES) Indoor PCB Indoor and Communication fault between indoor Outdoor PCB Outdoor and outdoor units...
  • Page 36 Service Diagnosis OUTDOOR ERROR CODE FAULT DESCRIPTION SPARE PART (LED FLASH TIMES) Lack of refrigerant Refrigerant 4-way valve reverse failure 4-way valve Power over/under voltage protection Power module Outdoor pipe temperature sensor High pressure protection Outdoor PCB Outdoor coil temperature sensor Defrost temperature sensor Power module Outdoor Alternating current over...
  • Page 37 Service Diagnosis 10.4.1 Thermistor or Related Abnormality Indoor Display E1: Room temperature sensor failure E2: Heat-exchange sensor failure Outdoor display LED1 flash 10 times Defrost temperature sensor failure LED1 flash 11 times Suction temperature sensor failure LED1 flash 12 times Ambient temperature sensor failure LED1 flash 13 times Discharge temperature sensor failure Method of Malfunction...
  • Page 38 Service Diagnosis 10.4.2 EEPROM abnormal E4: Indoor EEPROM error Indoor Display Indoor display F12: Outdoor EEPROM error; Outdoor LED1 flash 1 times Method of Malfunction The Data detected by the EEPROM are used to determine MCU Detection Malfunction When the data of EEPROM is error or the EEPROM is damaged Decision Conditions Supposed...
  • Page 39 Service Diagnosis Indoor DC fan motor malfunction 10.4.3 Indoor Display E14 Indoor DC fan motor malfunction Method of When the fan motor is running, the speed detected by the Hall IC is used to judge the Malfunction abnormal operation of the fan motor Detection Malfunction When the detected rotation feedback signal don’t received in 2 minutes...
  • Page 40 Service Diagnosis Turn on the unit and check if Measure whether there is a voltage the motor can run pulse (0-15VDC) between 4 and 5 of the CN9 terminal on the indoor PCB The indoor motor is damaged Is it ok? and need replace The indoor PCB is damaged and need replace...
  • Page 41 Service Diagnosis 10.4.4 Outdoor DC fan motor fault Outdoor display F8 LED1 flash 9 times Method of DC fan motor is detected by checking the fan running condition and so on Detection Malfunction When the detected rotation feedback signal don’t received i n2 minutes Decision Conditions ■...
  • Page 42 Service Diagnosis The resistances The module PCB is between black line and The resistances are damaged, replace it red line, between black more than 40kΩ with a new one. line and white line of the fan terminal of outdoor PCB are greater than 10MΩ...
  • Page 43 Service Diagnosis 10.4.5 IPM protection Outdoor display: F1 LED1 flash 2 times Method of IPM protection is detected by checking the compressor running condition and so on Malfunction Detection The system leads to IPM protection due to over current Malfunction Decision The compressor faulty leads to IPM protection Circuit component of IPM is broken and led to IPM protection...
  • Page 44 Service Diagnosis 10.4.6 Over-current of the compressor Outdoor Display F22, F2, F23 LED1 flash 3 or 24 or 25 times Method of The current of the compressor is too high Malfunction Detection Malfunction When the IPM Module is damaged or the compressor is damaged. Decision Conditions Power supply voltage is too low or too high...
  • Page 45 Service Diagnosis 10.4.7 The communication fault between IPM and outdoor PCB Outdoor display: F3 LED1 flash 4 times Method of Malfunction Communication is detected by checking the IPM module and the outdoor PCB Detection Malfunction ■ The outdoor PCB broken leads to communication fault Decision ■...
  • Page 46 Service Diagnosis 10.4.8 Power Supply Over or under voltage fault Outdoor display: F19 LED1 flash 6 times An abnormal voltage rise or fall is detected by checking the specified voltage detection circuit. Method of The power supply is over voltage Malfunction Detection Malfunction...
  • Page 47 Service Diagnosis 10.4.9 Overheat Protection for Discharge Temperature Outdoor display: F4 LED1 flash 8 times Method of Check the control of the discharge temperature by the temperature detected by the Malfunction discharge pipe thermistor Detection Malfunction When the compressor discharge temperature is above 110℃ Decision Conditions ■...
  • Page 48 Service Diagnosis 10.4.10 The communication fault between indoor and outdoor Split board Indoor display E7 outdoor display LED1 flash 15 times Method of Communication is detected by checking the indoor PCB and the outdoor PCB. Malfunction Detection Malfunction The outdoor PCB broken leads to communication fault. Decision The indoor PCB broken leads to communication fault.
  • Page 49 Service Diagnosis Check the indoor PCB: only indoor charged measure the voltage between 3 and 4 of IC6 on the indoor PCB with a universal meter. And measure the voltage between CN23(S) and CN17 (L) with a universal meter. If the voltage is a constant value from DC 0V to DC 5V.Or The indoor PCB is the voltage between...
  • Page 50 Service Diagnosis Remove fan motor after Fan motor is switch off the power and damaged. And restart the unit, the LED replace it with a new 1 becomes light or flash. one. Test the fan motor terminal resistance between pin 1(310V) and pin 4(0V), or pin 5(15V) and pin 4(0V) of CN21 are close to 0mΩ...
  • Page 51 Service Diagnosis All-in-one board Indoor display E7 outdoor display LED2 flash 15 times Method of Communication is detected by checking the indoor PCB and the outdoor PCB. Malfunction Detection The outdoor PCB broken leads to communication fault. Malfunction  The indoor PCB broken leads to communication fault. Decision ...
  • Page 52 Service Diagnosis Check the indoor PCB: Only indoor charged measure the voltage between 3 and 4 of IC6 on the indoor mainboard with a universal meter. And measure the voltage between CN23(S) and CN52 (L) with a universal meter. If the voltage is a constant value of 0V DC to 5V DC .Or the voltage between communication line (red) The indoor PCB is damaged;...
  • Page 53 Service Diagnosis Remove fan motor after switch off the power and Fan motor is damaged. Replace restart the unit, the LED 2 it with a new one. becomes light or flash. Test the fan motor terminal resistance between pin 1 (310V) and pin 4 (0V), or pin5 (15V) and pin4 (0V) of CN21 are close to 0mΩ...
  • Page 54 Service Diagnosis 10.4.11 Loss of synchronism detection (Compressor position detection circuit fault) Outdoor Display F11 LED1 flash 18 times F28 LED1 flash 19 times Method of The position of the compressor rotor can’t detected normally Malfunction Detection Malfunction When the wiring of compressor is wrong or the connection is poor; Decision Or the compressor is damaged Conditions...
  • Page 55 Service Diagnosis 10.4.12 High work-intense protection Outdoor display E 9 LED1 flash 21 times High work-intense control is activated in the heating mode if the temperature Method of being sensed by the heat exchanger thermistor exceeds the limit. Malfunction Detection Malfunction Activated when the temperature being sensed by the heat exchanger rises above 65℃...

  • Page 56: Performance And Cerves Diagrams

    Performance curves diagram Performance Curves Diagram 11.1 cooling capacity-temp. curves Domestic air conditioner...
  • Page 57 Performance curves diagram 11.2 heating capacity-temp.curves Domestic air conditioner...
  • Page 58 Performance curves diagram 11.3 Coolingpower consumption-temp.curves Domestic air conditioner...
  • Page 59 Performance curves diagram 11.4 heating power consumption-temp.curves Domestic air conditioner...
  • Page 60 Performance curves diagram 11.5 Cooling discharge pressure Domestic air conditioner...
  • Page 61 Performance curves diagram 11.6 cooling suction pressure curves Domestic air conditioner...
  • Page 62 Performance curves diagram 11.7 heating discharge pressure curves Domestic air conditioner...
  • Page 63 Performance curves diagram 11.8 heating suction pressure curves Domestic air conditioner...

  • Page 64: Sound Level

    Sound level 12 Sound level Sound presure level 230V,50Hz sound power level Measuring location Model Cooling/heating (cooling/heating) Location of microphone M2T050-D2 cooling heating 1700 3400 6800 1700 3400 6800 NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20...

  • Page 65: Circuit Diagrams

    Circuit diagrams 13 Circuit diagrams 13.1 Outdoor unit control board Circuit Diagrams 4.7K 0.1uF R100 4.7K 10K-0805 4.7K 1-6-MODE 100Ω -0805 0.1uF 1-18-DEBUG-RX1 100Ω -0805 100Ω -0805 1-20-DEBUG-TX1 STEPA1 R101 GT24C1024 1-9-RST 100Ω -0805 R102 EEPROM STEPD TJC-06 TJC-04 在线烧写 560-0805 1-28-EESCL CN30...
  • Page 66 Circuit diagrams 13 Circuit diagrams 13.1 Outdoor unit control board Circuit Diagrams Domestic air conditioner...
  • Page 67 Circuit diagrams 13.2 Module board Circuit Diagram Domestic air conditioner...

  • Page 68: Removal Procedure

    14.Removal Procedure 1.Removal of Outdoor panel Outdoor unit Loosen the service Be careful not to cover screw and cut your finger by remove the service the fins of the cover. heat exchanger...
  • Page 69 Step Procedure Step Procedure Points Step Procedure Points Points 2. Remove the panels. Loosen the 7 screws and lift the top panel Loosen the screws of the panel. Pull and remove the front panel. Domestic air conditioner...
  • Page 70 Remove the fixting screws, then lift the electrical box Domestic air conditioner...
  • Page 71 Remove the air filters and horizontal flap Loosen the fixting screws and remove back protect net . ■ Loosen the fixting screws and remove the side panel. Domestic air conditioner...
  • Page 72 Remove the casing Loosen the fixting screws and remove the side panel. ■ Loosen the fixting screws and remove the cross beam. Domestic air conditioner...
  • Page 73 Loosen the fixting screws remove the fan Loosen the fixting screws and lift the fan motor. Domestic air conditioner...
  • Page 74 Release stepping motor (2type) Remove fixing screws,then lift the fan motor bracket Cut down and pull out compressor and remove Domestic air conditioner...
  • Page 75 Removal of Heat Exchanger Loosen the marked fixing screws Loosen the fixting hook Domestic air conditioner...
  • Page 76 Remove fixing screw,then lift valve set Domestic air conditioner...
  • Page 77 Generalny Dystrybutor Systemów Klimatyzacji i Pomp Ciepła HEIKO REFSYSTEM Sp. z o. o. ul. Metalowców 5 86-300 Grudziądz +48 723 737 378 www.heiko.pl...

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