Midea ATOM MDV-V18WMN1T Service Manual
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Midea ATOM MDV-V18WMN1T Service Manual

Midea ATOM MDV-V18WMN1T Service Manual

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◼ MDV-V18WMN1T
◼ MDV-V24WMN1T
◼ MDV-V36WMN1T
Model:
◼ MDV-V36WMN1TE
◼ MDV-V48WMN1TE
◼ MDV-V60WMN1TE
Service Manual
Midea ATOM X R410A Series

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Summary of Contents for Midea ATOM MDV-V18WMN1T

  • Page 1 Service Manual Midea ATOM X R410A Series Model: ◼ MDV-V18WMN1T ◼ MDV-V24WMN1T ◼ MDV-V36WMN1T Model: ◼ MDV-V36WMN1TE ◼ MDV-V48WMN1TE ◼ MDV-V60WMN1TE...

  • Page 2: Table Of Contents

    Restrictions On Refrigerant Pipes ..............................10 2.3.1 Piping Design ..................................10 2.3.2 Refrigerant Charge Calculation ............................13 Midea VRF System ......................................15 Refrigerant Circuit ..................................15 3.1.1 Functional Parts Layout Of Outdoor Units .......................... 15 3.1.2 Major Components Functions and Circuit Diagrams of Outdoor Units ................17 3.1.3...
  • Page 3 High Pressure Sensor Voltage Characteristics ..........................94 Low Pressure Sensor Voltage Characteristics ..........................95 Update Record ........................................ 96...

  • Page 4: Safety Cautions

    1 Safety Cautions Please read the following safety cautions before installing the unit or service work. WARNING may cause personal death or serious injury. CAUTION may lead to serious injury or structural damage under some conditions. All electric work must be performed by qualified personnel.
  • Page 5 These substances may cause certain components of the unit to corrode, which can result in refrigerant leakage, injury, electric shock, malfunctions or fire. Do not use a refrigerant other than R410A. Midea can’t be held responsible for malfunctions or accidents resulting from the use of the wrong type of refrigerant.
  • Page 6 Use the accessories parts listed and appropriate tools for installation or maintenance. Otherwise, it will cause water leakage, electrical shock, excessive heat generation or fire. Be sure to wear a safety helmet, gloves, and a safety belt when working at a high place. Insufficient safety measures may cause an accident.
  • Page 7 Please use wet cloth to cool valves (4-way valve, check valve, etc.) close to brazing point. High temperature may lead to inner leakage, which makes the system operate abnormal. Coil Guard Removal Please remove this coil guard in areas where winter design temperature is below 15F to prevent ice from building up. DO not cut the reusable strain-relief wire ties.
  • Page 8 Caution Be sure to check that the refrigerating cycle section has cooled down enough before conducting repair work. Working on the unit when the refrigerating cycle section is hot may cause scald. Do not touch the heat exchanger fins. Improper handling may result in injury because fins are sharp.

  • Page 9: General Information

    2 General Information Capacity 1.5TON 2TON 3TON 3TON 4TON 5TON MDV- MDV- MDV- Model Name MDV-V18WMN1T MDV-V48WMN1T MDV-V60WMN1T V24WMN1T V36WMN1T V36WMN1TE Capacity index Combination ratio *1 65%-130% 50-130% 50%-130% 50%-130% 50%-130% 50%-130% Indoor unit connectable Max. unit number Legend Refer to 2.1.2 Combination ratio restrictions 2.1.1 Combination Ratio Restrictions ����������...

  • Page 10: External Appearance

    2.2 External Appearance ◼ MDV-V18WMN1T ◼ MDV-V24WMN1T ◼ MDV-V36WMN1T ◼ MDV-V36WMN1TE ◼ MDV-V48WMN1T ◼ MDV-V60WMN1T...

  • Page 11: Restrictions On Refrigerant Pipes

    2.3 Restrictions On Refrigerant Pipes 2.3.1 Piping Design ◼ As bends cause pressure loss on transportation of refrigerant, the fewer bends in the system, the better it is. Piping length needs to take the actual equivalent length of bends into account. ODU model Bent equivalent length (m [ft.])/bend 18k-60k...
  • Page 12 OUTDOOR UNIT MAIN PIPE SELECTION (L1) Main Gas Main Liquid Maximum Total Capacity of Indoor Pipe Indoor Unit Model No. Capacity Liquid Pipe Length Pipe Diameter Number of Units Combination Diameter Branch Pipe Required Indoor Units Ratio Range Required MDV- Less than 148 ft.
  • Page 13 2.3.1.2 Pipe connection with third-part AHU indoor unit Fig. 2.3-2 Typical Refrigerant Piping Diagram Table 2.3-2 Piping and Component Names Length and Maximum Height Difference Maximum Permitted Length Piping Actual Length ≤ 164 ft. (50 m) Piping Length Maximum Piping Length Equivalent Length ≤...

  • Page 14: Refrigerant Charge Calculation

    2.3.2 Refrigerant Charge Calculation Amount of additional refrigerant to be charged Based on the field installed refrigerant pipe and system layout, additional refrigerant charge may be required. Please add additional refrigerant according to the calculation below. Recording the size of each liquid pipe from outdoor unit to indoor units is recommended. As well as the amount of refrigerant that was charged on the outdoor unit for future reference.
  • Page 15 Branch Pipe Kit Calculation Add 1.66 ft. (504 mm) per EACH liquid line branch pipe (incoming pipe size only) for additional charge calculation. Example: The branch pipe kit has an incoming pipe size of 7/8” and outgoing pipe sizes of 3/8” and 5/8”. Use only the incoming pipe size of 7/8” to calculate the additional refrigerant charge for this branch pipe kit.

  • Page 16: Midea Vrf System

    3 Midea VRF System MV6-R heat recovery system is consists of Outdoor Unit (ODU), Multiport Distribution Controller (MS) and Indoor Units (IDU). MV6-X heat pump system is consists of Outdoor Unit (ODU) and Indoor Units (IDU). 3.1 Refrigerant Circuit 3.1.1 Functional Parts Layout Of Outdoor Units MDV-V18/24/36WMN1T ◼...
  • Page 17 MDV-V36WMN1TE/ MDV-V48WMN1T/ MDV-V60WMN1T ◼ Fan motor Four-way Valve High pressure switch Low pressure sensor High pressure sensor Fusible plug Discharge temperature sensor Electronic expansion valve Compressor Accumulator Oil separator Gas valve Filter Liquid valve...

  • Page 18: Major Components Functions And Circuit Diagrams Of Outdoor Units

    3.1.2 Major Components Functions and Circuit Diagrams of Outdoor Units 18, 24, 36, 48, 60K Symbol Name Major Function Refrigerant Electrical Wiring Circuit Diagram Diagram Varies the refrigerant flow rate by adjusting the frequency based on Inverter compressor COMP objective pressure 1) Used to separate liquid refrigerant from gas refrigerant Gas-liquid separator 2) Refrigerant storage...

  • Page 19: Refrigerant Flow For Each Operation Mode

    3.1.3 Refrigerant Flow for Each Operation Mode Cooling Operation...

  • Page 20: Heating Operation

    Heating Operation...
  • Page 21 Oil Return and Defrost Operation...

  • Page 22: Electrical Components And Wiring Diagrams

    3.2 Electrical Components And Wiring Diagrams 3.2.1 Outdoor Unit Circuit Board Arrangement (HIGH VOLTAGE WARNING) ◼ The control box contains high-voltage components, when removing the cover of control box at installation or maintenance work, do not let the cover contact with any of the electrical components inside the control box. ◼...

  • Page 23: Outdoor Unit Circuit Board Components

    3.2.2 Outdoor Unit Circuit Board Components 3.2.2.1 Compressor and Fan motor Drive Board The compressor and fan motor drive board contains main board at the bottom right. Note: The main board contains high-voltage components. Please pay the most attentions when inspecting it if power on the unit is required.

  • Page 24: Communication Board

    3.2.2.2 Communication Board Communication board is used for communication wiring connection and...

  • Page 25: Filter Board

    3.2.2.3 Filter Board...
  • Page 26 3.2.2.4 Wiring Diagrams of Outdoor Unit...
  • Page 27 3.2.2.5 Typical Communication Wiring with VRF Indoor Unit Outdoor Unit Indoor Unit 1 Indoor Unit 2 Indoor Unit 3 Indoor Unit 4 Notes: ◼ Install a terminating resistor (Ω120) on terminals P&Q on the indoor unit which is furthest from the outdoor unit. ◼...
  • Page 28 3.2.2.6 Typical Communication Wiring with third-part AHU Notes: ◼ Make sure the O/B type of indoor unit, and choose the correct O/B type on thermostat and outdoor unit...

  • Page 29: Function And Control

    3.3 Function And Control 3.3.1 Operation Mode Outdoor unit (cooling and heating mode) Stop Control Start Control Standby Prepare Stop Start Normal Control Defrost Control Oil return NOTE 1： The system may go into the error mode on either the outdoor unit or the indoor units. If some of the indoor units are experiencing a problem, only those with problem will shut down.

  • Page 30: Stop Control

    3.3.2 Stop control 3.3.2.1 Operations of different parts when the system stops. Part Name Symbol Stop control Inverter compressor FANA Keeps for 2 min, then OFF Inverter fan FANB Keeps for 2 min, then OFF Four way valve Keep the state before stop Electronic expansion valves 300 pulse Low speed for 40sec.

  • Page 31: Startup Control

    3.3.3 Startup control The default period for restarting after stopping is 5 minutes, which is necessary to equalize the pressure in the whole system. Note: If indoor unit is AHU with thermal expansion valve, the period for restarting after stopping should be 5 minutes at least. 3.3.3.1 Third-part AHU start control Outdoor unit receives 24V electrical signal from thermostat and decide what mode operates into.
  • Page 32 3.3.3.2 Startup Control in Cooling Operation Part Name Symbol Startup control Inverter compressor 32Hz for 60s, then start platform FANA Operating for 2 minutes before compressor starting Inverter fan FANB Operating for 2 minutes before compressor starting Four way valve OFF (cooling) Electronic expansion valves 320 pulse...

  • Page 33: Basic Control

    3.3.4 Basic Control Outdoor unit exchanges heat to surrounding air by its heat exchanger (HEX). Outdoor HEX discharges heat to outside environment as a condenser when operating cooling mode. Otherwise, it absorbs heat from ambient environment as an evaporator when operating heating mode. 3.3.4.1 Normal Operation ◼...

  • Page 34: Compressor Control

    3.3.4.2 Compressor Control The compressor capacity control is to maintain evaporating pressure (Te) at constant during cooling operation and condensing pressure (Tc) at constant during heating operation. ◼ Cooling operation Compressor frequency is controlled to keep IDU evaporating pressure (Te) at target pressure (Tes). ➢...
  • Page 35 ◼ Operating frequency ranges During normal operation, the minimum frequency is always 18Hz for all outdoor units and the maximum one is limited as the table below. Frequency Range in Cooling or main Cooling Frequency Range in Heating or main Heating Model MDV-V18WMN1T 18 Hz...

  • Page 36: Electronic Expansion Valve Control

    3.3.4.3 Electronic expansion valve control ◼ EXVA control in cooling mode The target of EXVA control in cooling mode, is to keep compressor superheat, heat exchanger outlet subcool, and liquid pipe pressure in proper range. ◼ EXVA control in heating mode The target of EXVA control in heating mode, is to keep compressor superheat and heat exchanger outlet superheat in proper range.

  • Page 37: Outdoor Unit Fan Control

    3.3.4.4 Outdoor Unit Fan Control Fan step control of 018/024/036/048/060 ATOM X Model Single Fan Model Double Fan Model Fan Step Fan Step RPM-UP RPM-UP RPM-DOWN...

  • Page 38: Heat Exchanger Control

    3.3.4.5 Heat Exchanger Control The ODU heat exchanger operates as condenser in cooling mode, and operates as evaporator in heating mode. Heat Exchanger Arrangement ◼ Operation mode State Four-way Valve Cooling Condenser Heating Evaporator Oil return/Defrost Condenser...

  • Page 39: Special Control

    3.3.5 Special Control 3.3.5.1 Oil Return Control Refer to the following conditions, ODU starts cooling oil return operation. When cumulative compressor operating time exceeds 8 hours. When oil discharge calculated is more than safety value. Step1 Step2 Step3 Part Name Symbol Prepare for oil returning Oil returning...
  • Page 40 Pure Heating Oil Return Control ◼ When cumulative compressor operating time exceeds 8 hours. Step1 Step2 Step3 Part Name Symbol Prepare for oil returning Oil returning After oil returning Inverter Decrease to 32Hz 3 Ton: 58 Hz; 4 Ton: 66 Hz; 5 Ton: 66 Hz Start platform compressor Inverter fan 1...

  • Page 41: Defrosting Operation

    3.3.5.2 Defrosting Operation In low temperature operation, the outdoor heat exchanger operating as evaporator may be covered by frost which will cause a dramatically decrease of capacity. The system carries out defrosting operation automatically by the following conditions. Initiate conditions: If cumulative operating time is more than 40 minutes, and T3 is continuously below X°C for more than 5 minutes after the last defrosting or oil returning, the system would enter defrosting mode according to T3.
  • Page 42 3.3.5.3 Refrigerant auto-charge Note: Refrigerant auto-charging is only recommended when the conditions below are met: ◼ Refrigerant pipe’s length is uncertain; ◼ Only one indoor unit , which is AHU with thermostatic expansion valve, is connected to outdoor unit; ◼ The matching ratio (IDU/ODU) is between 80% and 100%;...
  • Page 43 Note: ◼ During refrigerant auto-charging, do not power off the system. ◼ The refrigerant charging amount should be calculated and recorded. Operate IDU in cooling mode with highest fan speed (high fan mode). Turn on refrigerant supply, the system will charge refrigerant automatically in 30 to 60 minutes. The refrigerant amount charged should be calculated and recorded.
  • Page 44 There are several reasons could lead to this situation: ◼ Refrigerant supply is not enough The refrigerant needed is more than the refrigerant charged, and the refrigerant supply is not enough (e.g. refrigerant canister is empty). Please check the refrigerant supply, press “OK” on mainboard for 5 seconds to quit auto-charging mode, and reenter this mode as described above. ◼...
  • Page 45 3.3.5.4 Chassis electric heating belt control Chassis electric heating belt control is used to prevent chassis from being freeze by condensate water and ice rain, when ambient temperature is less than 0°C. Accumulated ice on chassis would block drain hole and damage condenser, which can melted by electrical heating. The heater will take effect when both conditions below are met Ambient temperature T4 is less than 2°C.
  • Page 46 3.3.5.5 W/D signal control When ambient temperature is too low, and during defrosting period, “W/D” would send 24V signal to thermostat and indoor unit to turn on auxiliary heating source to prevent indoor temperature drop. Heating mode with compressor running During defrosting Ambient temp.

  • Page 47: Crankcase Heater Control

    3.3.5.6 Crankcase Heater Control In order to prevent the refrigerant from melting in the compressor oil, this mode is used to control the crankcase heater. T4 < 10 and continuous down time > 4 hours Crankcase heater OFF Crankcase heater ON Discharge temp.
  • Page 48 3.3.5.7 Cooling Test Control Cooling test control is used to check whether the system can operate cooling mode normally. Press “1-1-0” on PCB to enter cooling test mode, and all indoor units downstairs operate in cooling mode set at 17°C with high wind. The system operates in cooling mode normally.
  • Page 49 3.3.5.8 Heating Test Control Heating test control is used to check whether the system can operate heating mode normally. Press “1-1-1” on PCB to enter heating test mode, and all indoor units downstairs operate in heating mode set at 30°C with high wind. The system operates in heating mode normally.

  • Page 50: Test Operation Control

    3.3.5.9 Test Operation Control Test operation is used to debug malfunction because of incorrect installation. Press “1-1-2” on PCB to enter test operation. Basic procedure of test operation Before entering test operation, please debug malfunction in stop mode, such as temperature sensor error, communication error and so on. Function menu Settings to the <1-1-2>, the system will perform a test operating.
  • Page 51 3.3.5.10 Heating prohibition control This control is used to set ambient temperature T4 for heating permitted temperature range. When T4 < T4set, the indoor units operating in heating mode with auxiliary heating source (please check function instruction of indoor unit) will turn to thermo-OFF. When T4 ≥ T4set+1°C, the indoor units will recover to operate in heating mode.
  • Page 52 3.3.5.11 Mode priority control Mode priority control Choose priority mode from menu “2-0-0” to “2-0-9”. Menu Mode priority T4 priority mode Cooling priority mode VIP priority mode 2-0- Heating only mode Cooling only mode Heating priority mode Demand priority mode T4 priority mode (Auto priority mode) ◼...
  • Page 53 3.3.5.12 Operation Limits Control Before compressors are about to start, the outdoor unit judge whether it’s suitable to operate or not by the value of ambient temperature (T4). • Cooling startup when -15°C T4 50°C • Heating startup when -25°C T4 30°C Startup allowable Startup prohibited •...

  • Page 54: Field Setting

    3.4 Field Setting 3.4.1 Commissioning 3.4.1.1 Check List before Start Up All Interconnecting pipework has been fully completed. Condensate disposal system fully completed and gravity portions have been tested. Control cabling installation complete except for final connection to outdoor units. Required additional refrigerant added - Add refrigerant before opening the service valves.
  • Page 55 3.4.1.2 Commissioning Step 1: Power on ◼ Cover the lower panel of the ODU, and power on all IDUs and ODU. Step 2: Enter commissioning mode ◼ When the ODU is first powered on, it displays "-. -. -. -." , which means the unit is not commissioned. Press and hold the "DOWN" and "UP" buttons simultaneously for 5 seconds to enter the commissioning mode.

  • Page 56: Spot Check

    3.4.2 Spot check Press SW 3(UP) & SW 2(DOWN) to CHECK the number of times shown in the No** column to view system data and performance information. DISP. CONTENT DESCRIPTION "Standby (ODU address+ IDU quantity)/frequency/special status" ODU address ODU capacity Unit: Ton Quantity of ODU Quantity of IDUs...
  • Page 57 Quantity of running IDUs Actual quantity [0] OFF [1] C1: Condenser [2] D1: Reserved [3] D2: Reserved Heat exchanger status [4] E1: Evaporator [5] F1: Reserved [6] F2: Reserved [0] Not in special mode [1] Oil return [2] Defrost Special mode [3] Startup [4] Stop [5] Quick check...

  • Page 58: Access Service Menu

    3.4.3 Access Service Menu...
  • Page 59 Function Menu First-level Second-level Specified menu Description Default menu menu mode 【0】 Error code history 【0】 【1】 Clear error code history 【0】 【1】 【0】 IDU address 【2】 【1】 Driver's version 【0】 【-】 Service mode 【0】 Cooling test 【1】 【1】 Heating test 【0】...
  • Page 60 【5】 Evaporation temperature setting (Ke0=8) 【6】 Evaporation temperature setting (Ke0=9) 【7】 Evaporation temperature setting (Ke0=10) 【8】 Evaporation temperature setting (Ke0=11) 【0】 Condensation temperature setting (Kc0=41) 【1】 Condensation temperature setting (Kc0=42) 【2】 Condensation temperature setting (Kc0=43) 【3】 Condensation temperature setting (Kc0=44) 【2】...

  • Page 61: Troubleshooting

    4 Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. 4.1 Malfunction Code of Outdoor unit Error Code Definition Communication error between indoor units and outdoor unit Temperature sensor (T3 or T4) error Power voltage protection DC fan error Compressor discharge temperature sensor (T5) error...

  • Page 62: Service Code Of Outdoor Unit

    4.2 Service Code of Outdoor unit Service code represents details of error code. If outdoor unit stopped and displayed error code, please press “UP”/”DOWN” button to check what No.55 shows, and see troubleshooting below to find solutions. Mainboard service code Service Code Error Code Description...
  • Page 63 Compressor driver service code 1L01 1L1* error occurs 3 times in 60 minutes 1L11 Software overcurrent 1L13 Magnetic overload protection 1L2E Inverter module high temperature protection 1L3E Low bus voltage error 1L31 High bus voltage error 1L43 Abnormal current sampling 1L46 IPM protection Startup failed...
  • Page 64 Fan motor driver service code 1J01 1J** error occurs 10 times in 120 minutes 1J11 Software overcurrent 1J12 Software overcurrent protection in last 30s 1J13 Magnetic overload protection 1J2E Inverter module high temperature protection 1J3E Low bus voltage error 1J31 High bus voltage error 1J43 Abnormal current sampling...

  • Page 65: Troubleshooting Of Mainboard

    4.3 Troubleshooting of mainboard 4.3.1 A01: Emergency Stop Definition and inspection of faults: ◼ The emergency stop signal is detected Supposed causes: ◼ Controller send emergency signal to outdoor unit ◼ Defective main board Check whether the controller send Contact house holder to confirm the emergency signal to outdoor unit reason of emergency stop Press [9-5] on function menu to...

  • Page 66: Aa1: Inverter Driver Chip And Main Control Chip Mismatch

    4.3.2 AA1: Inverter driver chip and main control chip mismatch Definition and inspection of faults: ◼ The driving parameters of the driver board do not match the mainboard Supposed causes: ◼ Wrong type of driver board ◼ Model Dial Switch (ENC1) setting is wrong ◼...

  • Page 67: 1B01/4B01: Electronic Expansion Valve (Eeva/C) Error

    4.3.3 1b01/4b01: Electronic expansion valve (EEVA/C) error Definition and inspection of faults: ◼ The electronic expansion valve signal was not detected by the mainboard for 2 minutes Supposed causes: ◼ The electric expansion valve (EEVA/C) winding is disconnected to mainboard ◼...

  • Page 68: C21: Communication Error Between Indoor Units And Outdoor Unit

    4.3.4 C21: Communication error between indoor units and outdoor unit Definition and inspection of faults ◼ Outdoor unit can’t communicate with indoor units Supposed causes ◼ Communication cables between ODU and IDUs are unstably or wrongly connected, or in short circuit. ◼...

  • Page 69: C26/C28: Number Of Indoor Units Detected By The Outdoor Unit Has Decreased/Increased

    4.3.5 C26/C28: Number of indoor units detected by the outdoor unit has decreased/increased Definition and inspection of faults ◼ The total number of IDUs set in commission is not the same as the actual detected total ones Supposed causes ◼ Repetitive addresses are exist for the IDUs in the refrigerant system ◼...

  • Page 70: 1C41: Communication Error Between Main Control Chip And Inverter Driver Chip

    4.3.6 1C41: Communication error between main control chip and inverter driver chip Definition and inspection of faults ◼ Communication fault between main board and compressor drive board Supposed causes ◼ Defective ODU mainboard...

  • Page 71: E41/F41/F91/Fa1/Fc1/Fd1: T4/T3/T5/T8/Tl/T7 Error (Open/Short)

    4.3.7 E41/F41/F91/FA1/FC1/Fd1: T4/T3/T5/T8/TL/T7 error (open/short) Definition and inspection of faults ◼ The temperature sensor (T4/T3/T7C/T5/T8/TL/T7) has short circuit or open circuit. ◼ Detective voltage > 4.95V or < 0.05V Supposed causes ◼ Contact failure between sensor and main board ◼ The temperature sensor is located at wrong place ◼...

  • Page 72: F71: Discharge Temperature Sensor Error (Open/Short)

    4.3.8 F71: Discharge temperature sensor error (open/short) Definition and inspection of faults ◼ The discharge temperature sensor (T7C) has short circuit or open circuit. ◼ Detective voltage > 4.95V or < 0.05V Supposed causes ◼ Contact failure between sensor and main board ◼...

  • Page 73: F62/F6A: Inverter Module Temperature (Tf) Protection

    4.3.9 F62/F6A: Inverter module temperature (Tf) protection Definition and inspection of faults ◼ NTC temperature is higher than 100°C Supposed causes ◼ Poor contact between driver board and cooler ◼ Lack of silicone thermal grease ◼ Defective driver board ◼ Gas/liquid valves closed ◼...

  • Page 74: F72/F7A: Discharge Temperature (T7C) Protection

    4.3.10 F72/F7A: Discharge temperature (T7C) protection Definition and inspection of faults ◼ Discharge temperature is higher than 115°C ◼ F7A will be reported when 3 times of F72 occurs within 100 minutes. Supposed causes ◼ Too high discharge temperature caused by little refrigerant remains in the system ◼...

  • Page 75: F75: Compressor Discharge Insufficient Superheat Protection

    4.3.11 F75: Compressor discharge insufficient superheat protection Definition and inspection of faults ◼ The discharge temperature superheat of compressor is less than 43°F (6°C) for more than 60 minutes Supposed causes ◼ Some valves of IDU cannot be fully closed ◼...

  • Page 76: P11: High Pressure Sensor Malfunction

    4.3.12 P11: High pressure sensor malfunction Definition and inspection of faults: ◼ The detected output voltage is beyond the high pressure sensor voltage characteristics in Appendix. ◼ High pressure sensor is in open or short circuit Supposed causes: ◼ The high pressure and low pressure are too low caused by less refrigerant in the system ◼...

  • Page 77: P12: Discharge Pipe High Pressure Protection

    4.3.13 P12: Discharge pipe high pressure protection Definition and inspection of faults: ◼ The detected high pressure is higher than 4.2 MPa Supposed causes: ◼ Extremely high pressure for too much refrigerant ◼ The refrigerant has been blocked in high pressure zone owing to the valve fault ◼...

  • Page 78: P22/P25: Low Pressure Protection

    4.3.14 P22/P25: Low pressure protection Definition and inspection of faults: ◼ The detected low pressure is lower than 0.12 MPa ◼ P25 fault will be shown when 3 times of P22 has been occurred in 60 minutes Supposed causes: ◼ There is too little refrigerant in the system ◼...

  • Page 79: 1P32/1P33: Compressor High Dc Bus Current Protection

    4.3.15 1P32/1P33: Compressor high DC bus current protection Definition and inspection of faults: ◼ Compressor current is higher than 17A (single fan model)/24A (double fan model) Supposed causes: ◼ Stop valve is closed ◼ Abnormal voltage of power supply ◼ Too much refrigerant in the system ◼...

  • Page 80: P51/P52: Power Voltage Protection

    4.3.16 P51/P52: Power voltage protection Definition and inspection of faults ◼ The detected voltage of ODU is not within the range of accepted value Supposed causes ◼ The voltage of ODU power supply is not within ±10% of rated voltage ◼...

  • Page 81: 1P56: Inverter Module Dc Bus Low Voltage Error

    4.3.17 1P56: Inverter module DC bus low voltage error Definition and inspection of faults ◼ Driver board DC bus under voltage Supposed causes ◼ Under voltage or phase loss in the ODU power supply ◼ Loose internal wiring in the electric control box ◼...

  • Page 82: 1P57/1P58: Inverter Module Dc Bus High Voltage Error

    4.3.18 1P57/1P58: Inverter module DC bus high voltage error Definition and inspection of faults ◼ Driver board DC bus over voltage Supposed causes ◼ ODU power supply overvoltage ◼ Driver board PCB damage...

  • Page 83: 1P59: Inverter Module Dc Bus Voltage Drop Protection

    4.3.19 1P59: Inverter module DC bus voltage drop protection Definition and inspection of faults ◼ Driver board DC bus over voltage Supposed causes ◼ Under voltage or phase loss in the ODU power supply ◼ Loose internal wiring in the electric control box ◼...

  • Page 84: 1P71: Eeprom Error

    4.3.20 1P71: EEPROM error Definition and inspection of faults ◼ EEPROM can’t communicate with main chip ◼ Unmatched data for EEPROM Supposed causes ◼ EEPROM is broken ◼ Software in EEPROM is wrong ◼ Wrong EEPROM model...

  • Page 85: Troubleshooting Of Compressor Driver

    4.4 Troubleshooting of Compressor driver 4.4.1 1L11: Software overcurrent Definition and inspection of faults ◼ The compressor current exceeds the protective value set by the software. Supposed causes ◼ There are impurities in the refrigerant system or the compressor is instantly stuck ◼...

  • Page 86: 1L2E: Inverter Module High Temperature Protection

    4.4.2 1L2E: Inverter module high temperature protection Definition and inspection of faults ◼ Module temperature exceeds the set value (100°C) Supposed causes ◼ The compressor or fan drive power module (IPM) on the drive board is not tightened, leading to poor heat dissipation; ◼...

  • Page 87: 1L46: Ipm Protection

    4.4.3 1L46: IPM protection Definition and inspection of faults ◼ Overcurrent fault in the power module of the drive board, or under voltage fault in the power module drive. Supposed causes ◼ Compressor wiring reversed, loose, short-circuited; ◼ There are impurities in the refrigerant system or the compressor is instantly stuck; ◼...

  • Page 88: 1L5E: Startup Failed

    4.4.4 1L5E: Startup failed Definition and inspection of faults ◼ Compressor failed to start Supposed causes ◼ The stop valve is not open ◼ There is a pressure difference at system startup ◼ Compressor stuck, wear, system blockage ◼ Abnormal compressor drive board Remove all obstacles from heat Is the ODU in good ventilation and heat exchanging with surroundings...

  • Page 89: 1L52: Locked-Rotor Protection

    4.4.5 1L52: Locked-rotor Protection Definition and inspection of faults ◼ Compressor locked-rotor occurred Supposed causes ◼ The system has impurities or lacks oil, causing compressor locked Is the stop valve open Open the stop valve Balance anomaly, check Is the high and low pressure difference during start-up higher than 0.3Mpa? the refrigerant system Inspect the drive IPM after powering off...

  • Page 90: 1L6E: Motor Phase Loss Protection

    4.4.6 1L6E: Motor phase loss protection Definition and inspection of faults ◼ Compressor phase loss protection occurred Supposed causes ◼ Poor contact of compressor wiring or terminal screw is not tightened Power off and check if the UVW output terminals of the drive board or the UVW Secure the wiring terminals of the compressor are disconnected...

  • Page 91: Troubleshooting Of Fan Driver

    4.5 Troubleshooting of Fan driver 4.5.1 1J01: 1J** error occurs 10 times in 120 minutes Definition and inspection of faults ◼ The compressor current exceeds the protective value set by the software. Supposed causes ◼ Fan motor is stuck or open circuit ◼...

  • Page 92: Appendix

    5 Appendix 5.1 Key components and parts type Components Single Fan Double Fan Compressor INV1 EATM240D57UMT ATQ420D1UMU FAN1 ZL-580*200*12-3N ZL-508*170*12-3N ZL-508*170*12-3N MOTORA ZKSN-200-10-4L ZKSN-100-8-4L 310 Fan Motor MOTORB ZKSN-100-8-4L 310 Oil Seprator Oil Seprator YFLQ-02VA(Y) YFLQ-03VC Accumulator 4.6 L 5.6L EXVA EEV24T500P EEV32T500P...

  • Page 93: Resistance Of Temperature Sensor A

    5.2 Resistance of Temperature sensor A Temp. Temp. Resistance Voltage Temp. Temp. Resistance Voltage Temp. Temp. Resistance Voltage (°C) (°F) (KΩ) (°C) (°F) (KΩ) (°C) (°F) (KΩ) -38.2 387.13 0.1020 51.8 19.617 1.4561 141.8 2.2728 3.9002 -36.4 360.98 0.1092 53.6 18.656 1.5085 143.6...

  • Page 94: Resistance Of Temperature Sensor B

    5.3 Resistance of Temperature sensor B Temp. Temp. Resistance Voltage Temp. Temp. Resistance Voltage Temp. Temp. Resistance Voltage (°C) (°F) (KΩ) (°C) (°F) (KΩ) (°C) (°F) (KΩ) 542.7 0.0732 89.6 40.57 0.8287 183.2 6.033 2.8596 -2.2 511.9 0.0775 91.4 38.89 0.8584 5.844 2.8984...
  • Page 95 5.4 High Pressure Sensor Voltage Characteristics High pressure (MPa) High pressure (psi) Resistance (KΩ) Output voltage(V) 14.5 60.59885239 0.58696 51.73938272 0.67392 43.5 44.90498791 0.76088 39.47255331 0.84784 72.5 35.05082585 0.9348 31.38174757 1.02176 101.5 28.28822137 1.10872 25.64467015 1.19568 130.5 23.35957213 1.28264 21.36464953 1.3696 159.5 19.60792992...
  • Page 96 5.5 Low Pressure Sensor Voltage Characteristics Low pressure Low pressure Resistance Output Low pressure Low pressure Resistance Output (MPa) (psi) (KΩ) voltage(V) (MPa) (psi) (KΩ) voltage(V) 14.5 49.51142857 0.68 98.6 13.60666667 1.86 0.11 47.91222222 0.72 13.15052632 0.12 17.4 46.39945946 0.74 0.73 12.50122449 1.96...
  • Page 97 6 Update Record...

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