Midea MSC-90D2N8-A Manual
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Midea MSC-90D2N8-A Manual

Pool heat pump
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Midea Building Technologies Division
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ESG-Inv M Series
Pool Heat Pump
MBT Confidential

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Summary of Contents for Midea MSC-90D2N8-A

  • Page 1 Midea Building Technologies Division Technical Manual ESG-Inv M Series Pool Heat Pump MBT Confidential...

  • Page 2: Table Of Contents

    ESG-Inv M CONTENTS Part 1 General Information ................3 Part 2 Engineering Data ................. 5 Part 3 Component Layout and Refrigerant Circuits ........17 Part 4 Control ....................21 Part 5 Diagnosis and Troubleshooting ............27 Part 6 Parts Replacement ................71 MBT Confidential...
  • Page 3 ESG-Inv M MBT Confidential...

  • Page 4: Part 1 General Information

    ESG-Inv M Part 1 General Information 1 LINEUP ....................... 4 2 NOMENCLATURE ..................6 MBT Confidential...
  • Page 5 ESG-Inv M 1 Lineup Model MSC-70D2N8-A MSC-90D2N8-A MSC-120D2N8-A Appearance 220-240V~ 50Hz ● ● ● 2 Nomenclature Design code Refrigerant: R32 DC Inverter design: Compressor, fan motor Capacity: 7kW C: Mono type S: Swimming pool application M: Midea MBT Confidential...

  • Page 6: Part 2 Engineering Data

      ESG‐Inv M       Part 2  Engineering  Data        1 Specifications ...... ……………………………………………………………6  2 Electrical characteristics ................ 7  3 Dimensions and center of gravity ............ 8  4 Operating limits  .................. 8  5 Heating performance ................ 9  6 Hydronic performance  ................. 12  7 Octave band sound level .............. 13              5  MBT Confidential...

  • Page 7: 1 Specifications

    ESG‐Inv M         1 Specifications      MODEL  MSC‐70D2N8‐A  MSC‐90D2N8‐A  MSC‐120D2N8‐A  Power supply  220‐240V~ 50Hz  220‐240V~ 50Hz  220‐240V~ 50Hz  Capacity  kW  7.16    9.15    12.50    Heating    Rated input  kW  0.95    1.35    1.79    (A27/24.3℃, W28℃)  COP  7.50    6.80    7.00 ...
  • Page 8   ESG‐Inv M       Water pressure drop  kPa  4.6  7.3  13.8  dB(A)  41  43  49  Heating (A27/24.3℃, W28℃) Heating max  dB(A)  48  52  55  heating slince mode1  dB(A)  39  39  40  heating slince mode2  dB(A)  38  38  38  Sound presssure Level  Cooling (A35/‐℃, W28℃)  dB(A)  43  45  48  Cooling max  dB(A)  43  45  48 ...

  • Page 9: 3 Dimensions And Center Of Gravity

    ESG‐Inv M         3 Dimensions and Center of Gravity  MSC‐70D2N8‐A  MSC‐90D2N8‐A  MSC‐120D2N8‐A  )  Unit: mm 4 Operating limit  Heating  ‐10 ‐7 ‐5 Ambient temperature℃   Cooling  Ambient temperature℃   8      MBT Confidential...

  • Page 10: 5 Heating Performance

      ESG‐Inv M       5 Heating performance  Normal heating, rating heating frequency, W 28℃  MSC‐70D2N8‐A  Ambient temperature(℃) Ambient temperature(℃)   MSC‐90D2N8‐A  10.0 Ambient temperature(℃) Ambient temperature(℃)     MSC‐120D2N8‐A  14.0 13.0 12.0 11.0 10.0 Ambient temperature(℃) Ambient temperature(℃)           9  MBT Confidential...
  • Page 11 ESG‐Inv M         Normal heating, A27/24.3℃, W28℃  MSC‐70D2N8‐A  13.0 12.0 11.0 10.0 Compressor frequency(Hz) Compressor frequency(Hz)   MSC‐90D2N8‐A  10.0 13.0 12.0 11.0 10.0 Compressor frequency(Hz) Compressor frequency(Hz) MSC‐120D2N8‐A  12.0 14.0 11.0 12.0 10.0 10.0 Compressor frequency(Hz) Compressor frequency(Hz)             10      MBT Confidential...
  • Page 12   ESG‐Inv M       Normal heating, A15/12℃, W28℃  MSC‐70D2N8‐A  Compressor frequency(Hz) Compressor frequency(Hz) MSC‐90D2N8‐A  Compressor frequency(Hz) Compressor frequency(Hz) MSC‐120D2N8‐A  10.0 Compressor frequency(Hz) Compressor frequency(Hz)             11  MBT Confidential...

  • Page 13: 6 Hydronic Performance

    ESG‐Inv M         6 Hydronic performance  30.00 25.00 20.00 15.00 10.00 5.00 0.00 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 Water flow rate (m             12      MBT Confidential...

  • Page 14: 7 Octave Band Sound Level

      ESG‐Inv M       7 Octave band sound level      Heating: A27/24.3℃, W28℃                                                Side D   Side C  Side A   Side B     ...
  • Page 15 ESG‐Inv M         MSC‐90D2N8‐A  NR‐90   NR80    NR70    NR60    NR50    NR40    NR30    NR20    NR10    NR0  ‐10 31.5 1000 2000 4000 8000     Octave band central frequency (Hz)              ...
  • Page 16   ESG‐Inv M       MSC‐120D2N8‐A  NR‐90   NR80    NR70    NR60    NR50    NR40    NR30    NR20    NR10    NR0  ‐10 31.5 1000 2000 4000 8000     Octave band central frequency (Hz)           15  MBT Confidential...
  • Page 17 ESG‐Inv M           16      MBT Confidential...

  • Page 18: Part 3 Component Layout And Refrigerant Circuits

    ESG-Inv M Part 3 Component Layout and Refrigerant Circuits 1 Layout of Functional Components ............18 2 Piping Diagrams ..................19 MBT Confidential...
  • Page 19 ESG-Inv M 1 Layout of Functional Components MSC-70D2N8-A, MSC-90D2N8-A, MSC-120D2N8-A Air side heat exchanger Fan motor Electronic control box Water side Titanium heat exchager Low pressure switch High pressure switch Compressor 4 way valve Electric expansion valve Water flow switch Water outlet Water inlet MBT Confidential...
  • Page 20 ESG-Inv M 2 Piping Diagrams Refrigerant piping graphic example: High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas liquid mixture Low temperature, low pressure gas Heating mode Cooling/Defrost mode MBT Confidential...
  • Page 21 ESG-Inv M Legend Compressor Water flow switch 4-way valve Discharge temperature sensor(Tp) Air side heat exchanger Ambient temperature sensor(T4) Electronic expansion valve Evaporation temperature sensor in heating /Condenser temperature sensor in cooling(T3) Strainer Refrigerant inlet(liquid pipe) temperature sensor(T2) Water side titanium heat exchanger Refrigerant outlet(gas pipe) temperature sensor(T2B) High pressure switch Water outlet temperature sensor...

  • Page 22: Part 4 Control

      ESG‐Inv M       Part 4  Control    1 Stop ...................... 22   2 Standby .................... 22   3 Startup operation .................. 22   4 Normal operation .................. 23   5 Special Control  .................. 24                                                                                                                                                                                                                                           21  MBT Confidential...
  • Page 23 ESG‐Inv M         1 Stop  The stop operation occurs for one of the following reasons:  • Abnormal shutdown: in order to protect the compressors, if an abnormal state occurs the system stops and an error  code is displayed on the outdoor unit PCB digital displays and on the user interface.  • The system stops when the set temperature has been reached.  2 Standby  2.1 Water Pump Control      The water pump will run regularly to circulate the pool water to the heat pump so that the water temperature of the pool  can be detected, and heat pump can provide hot/cold water in time.  3 Startup operation  3.1 Compressor  • Startup Delay  In initial startup control and in restart control (except in oil return operation and defrosting operation), compressor startup  is delayed such that a minimum of the set re‐start delay time 3minutes has elapsed since the compressor stopped, in order  to prevent frequent compressor on/off and to equalize the pressure within the refrigerant system.    • Startup platform  In  initial  startup  control  and  in  re‐start  control,  compressor  startup  is  controlled  according  to  outdoor  ambient  temperature. Compressor startup follows one of two startup programs until the target rotation speed is reached. ...
  • Page 24   ESG‐Inv M       3.3 Cooling  Component  Wiring diagram label  Control functions and states  Inverter compressor    COMP  Compressor startup program selected according to ambient temperature  DC fan motor  FAN  Fan run at maximum speed  Position  (steps)  from  0  (fully  closed)  to  480  (fully  open),  controlled  according  to  Electronic expansion valve    EXV  outdoor ambient temperature, discharge temperature, suction superheat, compressor  speed and refrigerant system pressure  Four‐way valve  4‐WAY  Off  4 Normal operation  4.1 Heating ...
  • Page 25 ESG‐Inv M         When the outdoor unit stops:The EXV first moves to 480 (steps) and remains for 30 seconds, then closes fully, then moves  to the standby position (480 (steps)).    • Four‐way Valve Control    The four‐way valve is used to change the direction of refrigerant flow through the water side heat exchanger in order to  switch between cooling and heating mode.    During heating operation, the four‐way valve is on; during cooling and defrosting operations, the four‐way valve is off.    • Fan  The speed of the outdoor unit fan is adjusted in steps, as shown below  Fan speed (rpm)  Fan speed index  MSC‐70D2N8‐A  MSC‐90D2N8‐A  MSC‐120D2N8‐A  W1  150  150  150    200  200  200    250  250  250    300  300  300   ...
  • Page 26   ESG‐Inv M       For cooling mode:  Component  Wiring diagram label  Control functions and states  Inverter compressor    COMP  Runs at oil return operation rotation speed  DC fan motor  FAN  Controlled according to cooling mode  Electronic expansion valve  EXV  304 (steps)  Four‐way valve  4‐WAY  Off      5.2 Defrosting Operation  • Normal defrosting  In order to recover heating capacity, the defrosting operation is conducted when the outdoor unit air side heat exchanger  is performing as a condenser. The defrosting operation is controlled according to outdoor ambient temperature, air side  heat exchanger refrigerant outlet temperature and the compressor running time.    • Manual defrosting  It can be active by setting on the wired controller, which is also aimed to help heat pump recover heating capacity quickly.  Manual defrosting function will be deactivated automatically after normal defrosting.    Component  Wiring diagram label  Control functions and states  Inverter compressor ...
  • Page 27 ESG‐Inv M           26      MBT Confidential...

  • Page 28: Part 5 Diagnosis And Troubleshooting

    ESG-Inv M Part 5 Diagnosis and Troubleshooting 1 Electric wiring diagram ................28 2 Electric Control Box Layout ............... 29 3 PCB ......................30 4 Error Code Table ..................33 5 Troubleshooting ..................34 6 Temperature Sensor Resistance Characteristics ........68 7 USB function ....................
  • Page 29 ESG-Inv M 1 Electric wiring diagram Version: D DIP switch settings ON=1 OFF=0 DIP Switch Instruction 1-phase for 7kW unit 1-phase for 9kW unit 1-phase for 12kW unit Other combinations Reserved Factory default setting Other combinations Reserved 1-phase power supply Reserved External pump Reserved...
  • Page 30 ESG-Inv M 2 Electric Control Box Layout Inverter module PCB Main PCB Transformer Main PCB Terminal block for: External pump Power supply MBT Confidential...
  • Page 31 ESG-Inv M 3 PCB Main PCB Label Port Content Voltage(V) Power input port from main control board 220VAC CN43 Port for communication with Inverter module 12VDC/5VDC CN15 Port for remote ON/OFF 3.3VDC CN16 Port for flow switch 3.3VDC CN18 Port for high pressure switch 3.3VDC CN17 Port for low pressure switch...
  • Page 32 ESG-Inv M Reserved 3.3VDC Reserved 3.3VDC Port for T3,T4 temperature sensor 3.3VDC CN23 Port for EEV3/SG EVU 3.3VDC CN33 Port for electrical expansion valve1 12VDC CN22 Reserved 5VDC CN20 Reserved 5VDC CN11 Port for communication with wired controller PQE 5VDC CN29 Port for communication with wired controller AB 5VDC...
  • Page 33 ESG-Inv M Inverter module PCB Label Port Content Voltage(V) Compressor connection port U 380VAC Compressor connection port V 380VAC Compressor connection port W 380VAC CN32 Port for fan 380VAC CN10 Port for communication with main control board 12VDC Input port L for rectifier bridge 220VAC Input port N for rectifier bridge 220VAC...
  • Page 34 ESG-Inv M 4 Error Code Table Error code Content Ambient temp. sensor (T4) out of operation range High temperature protection of inverter module Water flow malfunction(after 3 times E8) Communication malfunction between controller and main control board Air side heat exchanger temperature sensor (T3)malfunction The ambient temperature sensor (T4)malfunction Water flow malfunction Suction temperature sensor(Th) malfunction...
  • Page 35 ESG-Inv M 5 Troubleshooting 5.1 Warning Warning  All electrical work must be carried by competent and suitably qualified, certified accredited professionals and in accordance with all applicable legislation (all national, local and other laws, standards, codes, rules, regulations and other legislation that apply in a given situation). ...

  • Page 36: Ba Ambient Temp. Sensor (T4) Out Of Operation Range

    ESG-Inv M 5.4 bA Troubleshooting Digital display output Procedure bA: Ambient temp. sensor (T4) out of operation range The setting value of T4MAX or T4MIN is out of Adjust the setting value according to the operation range operation range Temperature sensor is not installed Installed the temperature sensor Place the ambient temperature sensor(T4) in the normal using...

  • Page 37: C7 High Temperature Protection Of Inverter Module

    ESG-Inv M 5.5 C7 Troubleshooting Digital display output Procedure C7: High temperature protection of inverter module Power supply voltage is too high or too Adjust the power supply and make sure the power supply is stable Install the heat pump in the place with Poor ventilation at installation position good ventilation.
  • Page 38 ESG-Inv M 5.6 E0, E8 Troubleshooting Digital display output Procedure E0: Water flow malfunction(after 3 times E8) E8: Water flow malfunction Water flow switch connection on main Ensure the switch is connected properly PCB is loose Check the water piping and valves. Make sure the water piping is clean, there is no Water flow is insufficient air in the water piping and all valves are...

  • Page 39: E2 Communication Malfunction Between Controller And Main Control Board

    ESG-Inv M 5.8 E2 Troubleshooting Digital display output Procedure E2: Communication malfunction between controller and main control board Interference from high voltage (220V or Ensure the communication wires and higher) wires high voltage wires are separated Communication wires are close to a Remove the source of interference, or source of electromagnetic radiation such add additional shielding to the...

  • Page 40: Ed Inlet Water Temperature Sensor (Tw-In) Malfunction

    ESG-Inv M 5.9 E3, E5, E6, E9, EA, Ed, H2, H3, HA Troubleshooting Digital display output Procedure E5: ODU heat exchanger temperature sensor error (T3) E6: ODU ambient temperature sensor error (T4) E9: Suction temperature sensor error (Th) EA: Discharge temperature sensor error (Tp) Ed: Inlet water temperature sensor (TW-in) malfunction H2: Liquid refrigerant temperature sensor(T2)
  • Page 41 ESG-Inv M Discharge temperature sensor(Tp) connection is port CN4 on the refrigerant system PCB Inlet water temperature sensor (TW-in) connection, Outlet water temperature sensor (TW-out), Liquid refrigerant temperature sensor(T2), Gas refrigerant temperature sensor(T2B) malfunction is port CN10 on the refrigerant system PCB MBT Confidential...
  • Page 42 ESG-Inv M 5.10 EF Troubleshooting Digital display output Procedure EE: EEprom malfunction Replace main PCB MBT Confidential...
  • Page 43 ESG-Inv M 5.11 F1 Troubleshooting Digital display output Procedure F1: DC bus low voltage protection Power supply is abnormal. Provide normal power Wiring between power supply and Ensure the wiring is right inverter module PCB is wrong Replace inverter module PCB MBT Confidential...
  • Page 44 ESG-Inv M 5.12 F6 Troubleshooting Digital display output Procedure H6: EXV1 fault The EEV1 connector of the main PCB is loose or not Ensure the connection is well inserted Replace the coil of electronic expansion The coil of electronic expansion valve is damaged valve Replace main PCB Note:...
  • Page 45 ESG-Inv M 5.13 H1 Troubleshooting Digital display output Procedure H1: Communication malfunction between main control board and inverter board The connection between main PCB and inverter Ensure the connection is firm module is loosen The voltage of CN10 on inverter PCB isn’t 12VDC Replace the inverter PCB The voltage of CN43 on refrigerant PCB isn’t 12/5VDC...

  • Page 46: H4 Three Times L0 Protection

    ESG-Inv M 5.14 H4 Troubleshooting Digital display output Description  H4 indicates three times L0 protection in one hour  Heat pump stops running.  Error code is displayed on the refrigerant system PCB digital tube and user interface.. Procedure H4: Three times L0 protection Refer to P6 trouble shooting MBT Confidential...

  • Page 47: H6 The Dc Fan Malfunction

    ESG-Inv M 5.15 H6, HH Troubleshooting Digital display output Procedure H6: The DC fan malfunction HH: 10 times H6 in 2 hours Strong wind is blowing towards the Changer the outdoor unit’s installation fan, making the fan running in the wrong direction or build a shelter to protect the direction or the fan speed is too high or fan from strong wind...

  • Page 48: H7 Voltage Protection

    ESG-Inv M 5.16 H7 Troubleshooting Digital display output Procedure H7: Voltage protection Power supply voltage is not within ±10% of rated voltage or a phase is missing(for Provide normal power supply 3 phase model) Wires between main PCB, AC filter board (for 3 phase model) and electric control Ensure the wires are connected properly box power supply terminals are loose...
  • Page 49 ESG-Inv M Protection logic Normal operation Voltage ≥ 265V 180V≤Voltage < 256V for 30s Voltage ≤ 172V Error code H7 MBT Confidential...

  • Page 50: H8 Hp Pressure Sensor Malfunction

    ESG-Inv M 5.17 H8 Troubleshooting Digital display output Procedure H8: HP pressure sensor malfunction Pressure sensor connection Ensure the sensor is connected properly refrigerant system PCB is loose Pressure sensor has short-circuited or Replace the sensor failed Replace refrigerant system PCB Note: Pressure sensor connection is port CN3 on the main PCB.

  • Page 51: Hb Three Times Pp Protection And Tw-Out Below

    ESG-Inv M 5.18 Hb, PP Troubleshooting Digital display output Procedure Hb: Three times PP protection and TW- out below 7 ℃ PP: |TW-out-TW-in| abnormal protection Temperature sensor is not installed Installed the temperature sensor Temperature sensor connection on main Ensure the sensor is connected properly PCB is loose Temperature sensor is affected by Dry the sensor...
  • Page 52 ESG-Inv M 5.19 HF Troubleshooting Digital display output Procedure HF: Inverter module board EE prom malfunction Main PCB DIP switch setting is wrong Adjust the DIP switch setting Replace inverter module PCB MBT Confidential...

  • Page 53: Hp Low Pressure Protection In Cooling Mode

    ESG-Inv M 5.20 HP, P0 Troubleshooting Digital display output Procedure HP: Low pressure protection in cooling mode P0: Low pressure switch protection Ensure low pressure switch port is Low pressure switch port is not connected properly connected properly Inspect the system for leaks and add Insufficient refrigerant caused by refrigerant leakage refrigerant Globe valve is closed...
  • Page 54 ESG-Inv M Replace main PCB Notes: 1. Low pressure switch connection is port CN17 on the main PCB. 2. An insufficiency of refrigerant causes compressor discharge temperature to be higher than normal, discharge and suction pressures to be lower than normal and compressor current to be lower than normal, and may cause frosting to occur on the suction pipe. These issues disappear once sufficient refrigerant has been charged into the system.

  • Page 55: P1 High Pressure Switch Protection

    ESG-Inv M 5.21 P1 Troubleshooting Digital display output Procedure P1: High pressure switch protection Ensure the pressure switch is connected High pressure switch connection is loose properly Too much refrigerant is charged in the Release the right amount of refrigerant system Check water side heat exchanger, water The water flow rate is not sufficient in...
  • Page 56 ESG-Inv M Replace main PCB Notes: High pressure switch connection is port CN18 on the main PCB. High pressure side blockage causes discharge temperature to be higher than normal, discharge pressure to be higher than normal and suction pressure to be lower than normal.

  • Page 57: P3 Compressor Overcurrent Protection

    ESG-Inv M 5.22 P3 Troubleshooting Digital display output Procedure P3: Compressor overcurrent protection Power supply is abnormal Ensure power supply is normal Inverter module PCB is broken Replace the inverter module PCB Inverter module PCB is broken Replace compressor Notes: Set a multi-meter to buzzer mode and test any two terminals of P N and U V W of the inverter module.
  • Page 58 ESG-Inv M 5.23 P4 Troubleshooting Digital display output Procedure P4: Compressor discharge temperature too high protection High pressure switch protection Refer to P1 trouble shooting Discharge temperature sensor is not Installed the discharge temperature installed sensor Discharge temperature sensor Ensure the sensor is connected properly connection on main PCB is loose Discharge temperature sensor is affected Dry the sensor...

  • Page 59: P5 |Tw-Out-Tw-In| Value Too Big Protection

    ESG-Inv M 5.24 P5 Troubleshooting Digital display output Procedure P5: |TW-out-TW-in| value too big protection Inlet water temperature sensor (TW-in), outlet water temperature sensor is not Installed the temperature sensor installed Inlet water temperature sensor (TW-in), outlet water temperature sensor Ensure the sensor is connected properly connection on main PCB is loose Inlet water temperature sensor (TW-in),...
  • Page 60 ESG-Inv M Water system pressure is not satisfied the Ensure the pressure is in the reasonable range requirement Replace main PCB Notes: Inlet water temperature sensor (TW-in) connection, outlet water temperature sensor (TW-out) connection is port CN10 on the main PCB. MBT Confidential...

  • Page 61: Pb Anti-Freeze Mode

    ESG-Inv M 5.25 Pb Troubleshooting Digital display output Protection logic Pb: Anti-freeze mode Anti-freeze is used to protect the water system from cracking during winter. It is normal protection operation and heat pump will return to the normal operation automatically. Heating mode Normal operation Ambient temperature <...
  • Page 62 ESG-Inv M 5.26 Pd Troubleshooting Digital display output Procedure Pd: High temperature protection of air side heat exchanger temperature(T3) Ensure the fan or fan motor works The fan or fan motor is blocked or damaged normally The air side heat exchanger dirty or blockage Clean the air side heat exchanger The location of heat pump is near the place Make sure heat pump is away from high...
  • Page 63 ESG-Inv M Protection logic Normal operation Air side heat exchanger temperature > 61°C Air side heat exchanger temperature < 55°C Error code Pd MBT Confidential...
  • Page 64 ESG-Inv M 5.27 Inverter module Troubles shooting for single-phase models Digital display output Description L0 indicates Inverter or compressor protection L1 indicates DC bus low voltage protection L2 indicates DC bus high voltage protection L3 indicates current sampling error of PFC circuit L4 indicates rotating stall protection L5 indicates zero speed protection L7 indicates phase loss protection of compressor...
  • Page 65 ESG-Inv M Principle of DC inverter Inductor Power Bridge Inverter Comp Contactor Capacitor supply rectifier module ressor (220V) ○ ○ ○ ①Contactor is open, the current across the PTC to charge capacitor. After 5 seconds, the contactor closed. ②220-240V AC power supply change to DC power supply after bridge rectifier. ③The capacitor output steady power supply for inverter module P N terminals.
  • Page 66 ESG-Inv M IGBT Diode Brigde rectifier The normal resistances of the inverter compressor are 0.7-1.5Ω among U V W and infinite between each of U V W and ground. If any of the resistances differ from these specifications, the compressor has malfunctioned. Situation 2: L0 or L4 error appears after the compressor has been running for a period of time and the compressor speed is over 60rps L0 / L4...
  • Page 67 ESG-Inv M Situation 3: L0 error appears occasionally/irregularly The outdoor unit ventilation is not good Ensure enough space for unit ventilation L1/L2 troubleshooting The normal DC voltage between terminals P and N on inverter module is 1.4 time of AC power supply in standby , the DC voltage is 377V when the fan motor is running.
  • Page 68 ESG-Inv M Situation 2: L1 or L2 error appears after the compressor has been running for a period of time and the compressor speed is over 20rps L1 /L2 Re-start the unit once the power supply Power supply is abnormal has returned to normal Refer to the wiring diagram to reset the DIP Switch S1 setting is wrong...
  • Page 69 ESG-Inv M 6 Temperature Sensor Resistance Characteristics Outdoor ambient temperature sensor, water side heat exchanger refrigerant inlet(liquid pipe) / outlet(gas pipe) temperature sensor, air side heat exchanger refrigerant temperature sensor and suction pipe temperature sensor resistance characteristics Temperature Resistance Temperature Resistance Temperature Resistance...
  • Page 70 ESG-Inv M Compressor discharge pipe temperature sensor resistance characteristics Temperature Temperature Temperature Temperature Resistance Resistance Resistance Resistance (kΩ) (kΩ) (kΩ) (kΩ) (°C) (°C) (°C) (°C) 542.7 68.66 13.59 3.702 511.9 65.62 13.11 3.595 483.0 62.73 12.65 3.492 455.9 59.98 12.21 3.392 430.5 57.37...
  • Page 71 ESG-Inv M Water side heat exchanger water inlet / outlet temperature sensor, final outlet water temperature sensor resistance characteristics Temperature Temperature Temperature Temperature Resistance Resistance Resistance Resistance (kΩ) (kΩ) (kΩ) (kΩ) (°C) (°C) (°C) (°C) 867.29 98.227 17.600 4.4381 815.80 93.634 16.943 .3022...

  • Page 72: Part 6 Parts Replacement

    ESG-Inv M 7 USB function Installers can quickly copy the wired controller parameter settings or update the program via USB disk, which save the time of on-site installation. Step 1 Insert the USB into port CN26 on the main PCB. If the unit is operating, then it will shut down. Digital display USB port, CN26 SW2 CHECK button...
  • Page 73 ESG-Inv M Part 6 Parts Replacement 1 Wired controller ................... 73 2 Flow switch ................... 74 3 Compressor ..................75 4 Titanium heat exchanger ..............76 5 Inverter module PCB ................77 MBT Confidential...
  • Page 74 ESG-Inv M Warning  Servicing shall only be performed as recommended by the equipment manufacturer. Maintenance and repair requiring the assistance of other skilled personnel shall be carried out under the supervision of the person competent in the use of flammable refrigerants. Danger ...

  • Page 75: Wired Controller

    ESG-Inv M 1 Wired controller 1.1 Remove the component Isolate the main power supply, and prevent from accidental reconnection. Remove the screws of the junction box(a) Disconnect the connection wire(b) Open the cover of the protect box and use a flat-head screwdriver to pry it from the bottom of the controller(c) Take out the controller(d) Junction box Protect box...

  • Page 76: Flow Switch

    ESG-Inv M 2 Flow switch 2.1 Remove the component Isolate the main power supply, and prevent from accidental reconnection. Shut off the water supply to the unit and disconnect the water pipe joint Remove the screws of the junction box(a) Remove the top panel(b) Remove the support panel(c) Remove the flow switch which installed on the titanium heat exchanger and remove the wire terminal from main...

  • Page 77: Compressor

    ESG-Inv M 3 Compressor 3.1 Remove the component Isolate the main power supply, and prevent from accidental reconnection. Remove the panels(a) Take out all of the refrigerant and keep the needle valve/ stop-off valve opening. Remove the compressor power cables. Remove the retaining nut of waterproof cover and the retaining nuts on the feet(b) Remove the connecting copper tubes using welding equipment(c) Junction box...

  • Page 78: Titanium Heat Exchanger

    ESG-Inv M 4 Titanium heat exchanger 4.1 Remove the component Isolate the main power supply, and prevent from accidental reconnection. Shut off the water supply to the unit and disconnect the water pipe joint Remove the panels(a) Take out all of the refrigerant and keep the needle valve/ stop-off valve opening. Remove the temperature sensors.

  • Page 79: Inverter Module Pcb

    ESG-Inv M 5 Inverter module PCB 5.1 Remove the component Isolate the main power supply, and prevent from accidental reconnection. Remove the panels(a) Remove the connecting cables if necessary Remove the retaining screws(b) Pull the inverter module PCB and mounting plate out from the top(c) Remove the retaining screws on the board.
  • Page 80 Ver. 2022-07 Midea Building Technologies Division Midea Group Add.: Midea Headquarters Building, 6 Midea Avenue, Shunde, Foshan, Guangdong, China Postal code: 528311 mbt.midea.com www.midea-group.com tsp.midea.com Note: Product specifications change from time to time as product improvements and developments are released and may vary from those in this document.

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