Download
Share
Print this page
Midea M thermal A Mono Series Service Manual
  1. Manuals
  2. Brands
  3. Midea Manuals
  4. Air Conditioner
  5. M thermal A Mono Series
  6. Service manual

Midea M thermal A Mono Series Service Manual

Commercial air conditioners
Hide thumbs

Advertisement

Quick Links

R32
Commercial Air Conditioners
Service
Manual
M thermal A Series Mono(18~30kW)
Midea CAC Confidential

Advertisement

loading

Related Manuals for Midea M thermal A Mono Series

Summary of Contents for Midea M thermal A Mono Series

  • Page 1 Commercial Air Conditioners Service Manual M thermal A Series Mono(18~30kW) Midea CAC Confidential...
  • Page 2 M thermal Mono CONTENTS Part 1 General Information ................3 Part 2 Component Layout and Refrigerant Circuits ........5 Part 3 Control ....................11 Part 4 Diagnosis and Troubleshooting ............25 202008 Midea CAC Confidential...
  • Page 3 M thermal Mono 202008 Midea CAC Confidential...
  • Page 4 M thermal Mono Part 1 General Information 1 Unit Capacities and External Appearance ..........4 202008 Midea CAC Confidential...
  • Page 5 M thermal Mono 1 Unit Capacities and External Appearance 1.1 Unit Capacities Table 1-1.1: Capacity range Capacity 18kW 22kW 26kW 30kW Model MHC-V18W/D2RN8 MHC-V22W/D2RN8 MHC-V26W/D2RN8 MHC-V30W/D2RN8 1.2 External Appearance Table 1-1.2: Appearance 18/22/26/30kW 202008 Midea CAC Confidential...
  • Page 6 M thermal Mono Part 2 Components Layout and Refrigerant Circuits 1 Layout of Functional Components .............. 6 2 Piping Diagrams ..................7 3 Refrigerant Flow Diagrams ................. 9 202008 Midea CAC Confidential...
  • Page 7 High pressure switch Low pressure switch Water pump Gas-liquid separator Safety valve Manometer DC inverter compressor Figure 2-1.2: MHC-V18(22,26,30)W/D2RN8 side view Accumulator One-way valve Air purge valve Water flow switch Expansion vessel Water side heat exchanger 202008 Midea CAC Confidential...
  • Page 8 Air side heat exchanger refrigerant outlet temperature sensor(cooling) Water outlet temp. sensor Filter Manometer Electronic expansion valve Safety valve Accumulator Circulating pump Refrigerant temperature sensor (liquid line) Expansion vessel Refrigerant temperature sensor (gas line) Air purge valve Pressure sensor Flow switch Gas-liquid separator 202008 Midea CAC Confidential...
  • Page 9 8. Water flow switch: Detects water flow rate to protect compressor and water pump in the event of insufficient water flow. 9. Manometer: Provides water circuit pressure readout. 10. Water pump: Circulates water in the water circuit. 202008 Midea CAC Confidential...
  • Page 10 High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure Pressure sensor 4-way Air side heat exchanger Accumulator Low pressure valve switch Filter Electronic High pressure expansion valve switch Filter Single-way electromagnetic valve Capillary 202008 Midea CAC Confidential...
  • Page 11 M thermal Mono 202008 Midea CAC Confidential...

  • Page 12: Table Of Contents

    2 Standby Control ..................12 3 Startup Control ..................13 4 Normal Operation Control ............... 14 5 Protection Control ................... 16 6 Special Control ..................19 7 Roles of Temperature Sensors in Control Functions ........22 202008 Midea CAC Confidential...

  • Page 13: Stop Operation

    (either manually or when the power has returned following a power outage), the crankcase heater turns on. 2.2 Water Pump Control When the outdoor unit is in standby, the internal and external circulator pumps run continuously. 202008 Midea CAC Confidential...

  • Page 14: Startup Control

    Control functions and states Compressor startup program selected according to Inverter compressor COMP ambient temperature and discharge temperature DC fan motor FAN_UP / FAN_DOWN Fan runs at higher speed Electronic expansion valve EEV1 304 steps Four-way valve 202008 Midea CAC Confidential...

  • Page 15: Normal Operation Control

    The running speed of six-pole compressors (used on all models) in rotations per second (rps) is one third of the frequency (in Hz) of the electrical input to the compressor motor. The frequency of the electrical input to the compressor motors can be altered at a rate of 1Hz per second. 202008 Midea CAC Confidential...
  • Page 16 The EXV is fully closed firstly, then moves to the standby position (304 steps). 4.6 Outdoor Fan Control The speeds of the outdoor unit fans are adjusted in steps, as shown below. Table 3-4.3: Fan speed index Fan speed (rpm) Fan speed index Upper fan Lower fan 202008 Midea CAC Confidential...

  • Page 17: Protection Control

    Low pressure protection, error code P0 is displayed Notes: : Suction pressure When the suction pressure drops below 0.14MPa the system displays P0 protection and the unit stops running. When the suction pressure rises above 0.3MPa, the compressor enters re-start control. 202008 Midea CAC Confidential...
  • Page 18 Compressor current protection, error code P3 is displayed When the compressor current rises above Current the system displays P3 protection and the unit stops running. When the compressor current drops below Current , the compressor enters re-start control. 202008 Midea CAC Confidential...
  • Page 19 5°C, the anti-freeze protection actions. In heating/DHW mode, leaving water temperature is below 2°C, the anti-freeze protection actions. When water side heat exchanger anti-freeze protection occurs the system displays Pb and the unit stops running. 202008 Midea CAC Confidential...

  • Page 20: Special Control

    Runs at oil return operation rotation speed Controlled according to outdoor heat exchanger pipe DC fan motor FAN_UP / FAN_DOWN temperature, ambient temperature, discharge temperature and compressor speed Electronic expansion valve EEV1 304 (steps) Four-way valve 202008 Midea CAC Confidential...
  • Page 21 (3-way valve SV3) control function will be activated to adjust the water temperature of the low temperature zone by control the opening time and closing time of the valve. The mixing valve will only turn on when two 202008 Midea CAC Confidential...
  • Page 22 TBH is only controlled by M1M2. If dry contract closes, T5<65 then TBH opens until water tank temperature reaches 70 . For AHS control In heating mode AHS on/off is only controlled by M1M2. In DHW mode, M1M2 control does not affect AHS on/off. 202008 Midea CAC Confidential...

  • Page 23: Roles Of Temperature Sensors In Control Functions

    3-way valve Distributor Bypass valve Floor heating loop Distributor Collector Radiator Fan coil units Collector Notes: The names and functions of the temperature sensors labelled 1 to 12 in this figure are detailed in Table 3-7.1. 202008 Midea CAC Confidential...
  • Page 24 10. Refer to Part 3, 5.7 Water Side Heat Exchanger Anti-freeze Protection Refer to Part 3, 2 Compressor Startup Program . Refer to Part 3, 4.2 Compressor Output Control . 11. Refer to Part 3, 6.3 Fast DHW Operation . 202008 Midea CAC Confidential...
  • Page 25 M thermal Mono 202008 Midea CAC Confidential...
  • Page 26 Part 4 Diagnosis and Troubleshooting 1 Outdoor Unit Electric Control Box Layout ..........26 2 Outdoor Unit PCBs ................... 27 3 Error Code Table ..................34 4 Troubleshooting ..................36 5 Appendix to Part 4 ................... 89 202008 Midea CAC Confidential...
  • Page 27 1 Outdoor Unit Electric Control Box Layout Figure 4-1.1: Electric control box front view Main control board Invert module(PCB A) of unit(PCB B) Main control board of hydraulic module Figure 4-1.2: Electric control box side view Invert module(PCB A) Filter board(PCB C) 202008 Midea CAC Confidential...
  • Page 28 The locations of each PCB in the outdoor unit electric control boxes are shown in Figures 4-1.1 to 4-1.7 in Part 4, 1 Outdoor Unit Electric Control Box Layout . 2.2 PCB Instruction Figure 4-2.1: MHC-V18(22,26,30)W/D2RN8 hydronic system main PCB 202008 Midea CAC Confidential...
  • Page 29 Feedback port for temperature switch(shorted in default) CN22 Control port for backup heater1/booster heater/Reserved CN41 Port for anti-freeze electric heating tape CN42 Port for anti-freeze electric heating tape CN29 Port for anti-freeze electric heating tape IC39 EEPROM 202008 Midea CAC Confidential...
  • Page 30 M thermal Mono Figure 4-2.2: MHC-V18(22,26,30)W/D2RN8 outdoor unit main PCB for refrigerant system 18 2 13 22 20 16 7 21 10 202008 Midea CAC Confidential...
  • Page 31 Port for communication D1D2E CN31 Port for high pressure switch and quick check CN30 Port for fan 15VDC power supply CN107/109 Port for fan CN36 Port for communication with PCB A CN38 Port for GND CN20/27 Port for SV 202008 Midea CAC Confidential...
  • Page 32 Input port P_out for IPM module Input port P_in for IPM module CN23 Input port for high pressure switch Power for switching power supply Power filtering L1 Power filtering L2 Power filtering L3 PED board IC25 EEPROM 202008 Midea CAC Confidential...
  • Page 33 Power supply port for DC fan CN30 Power supply port for main control board Power filtering L1 Power filtering L2 Power filtering L3 Port for communication with PCB B CN214 Power supply for PCB A switching power supply 202008 Midea CAC Confidential...
  • Page 34 Normal operation Leaving water temperature (°C) rotations per second Error or protection Error or protection code Error or protection code 2.4 Modbus Function Figure 4-2.6: Connection Unit Wired controller Modbus Max 16 units Figure 4-2.7: Wiring 202008 Midea CAC Confidential...
  • Page 35 H6 displayed 10 times in 120 minutes. Low pressure protection Pe<0.6 occured 3 times in 1 hour in cooling mode Low pressure protection High pressure protection Compressor overcurrent protection Table 4-3.1: Error code table (continued) Compressor discharge temp. too high protection 202008 Midea CAC Confidential...
  • Page 36 DC bus high voltage protection from DC driver MCE fault Zero speed protection Phase sequence fault Compressor frequency variation greater than 15Hz within 1 second protection Actual compressor frequency differs from target frequency by more than 15Hz protection 202008 Midea CAC Confidential...
  • Page 37 Power-off the outdoor units before connecting or disconnecting any connections or wiring, otherwise electric shock (which can cause physical injury or death) may occur or damage to components may occur. 202008 Midea CAC Confidential...
  • Page 38 M thermal Mono stops running. Error code is displayed on hydronic system main PCB and user interface. 4.2.3 Possible causes The wire circuit is short connected or open. Water flow rate is too low. Water flow switch damaged. 202008 Midea CAC Confidential...
  • Page 39 Water flow switch connection is port CN8 on the main PCB for hydronic system (labeled 9 in Figure 4-2.1). Check water pressure on the manometer. If the water pressure is not > 1 bar, water flow is insufficient. Refer to Figure 2-1.1. 202008 Midea CAC Confidential...
  • Page 40 M thermal Mono stops running. Error code is displayed on outdoor unit main PCB and user interface. 4.3.3 Possible causes Power supply phases not connected in correct sequence. Power supply terminals loose. Power supply abnormal. Main PCB damaged. 202008 Midea CAC Confidential...
  • Page 41 Therefore if multiple units are to be used, the phase sequence should be staggered, so that the current is distributed among the three phases equally. Loose power supply terminals can cause the compressors to operate abnormally and compressor current to be very large. 202008 Midea CAC Confidential...
  • Page 42 Communication wires between hydronic system and user interface not connected properly. Communication wiring X Y E terminals misconnected. Loosened wiring within electric control box. Interference from high voltage wires or other sources of electromagnetic radiation. Damaged main PCB or electric control box communication terminals block. 202008 Midea CAC Confidential...
  • Page 43 Replace hydronic system main PCB Notes: Measure the resistance among X, Y Y and E is infinite. Communication wiring has polarity. Ensure that the X wire is connected to X terminals and the Y wire is connected to Y terminals. 202008 Midea CAC Confidential...
  • Page 44 M thermal Mono stops running. Error code is displayed on hydronic system main PCB and user interface. 4.5.3 Possible causes Temperature sensor not connected properly or has malfunctioned. Damaged hydronic system main PCB. 202008 Midea CAC Confidential...
  • Page 45 Set a multi-meter to buzzer mode and test any two terminals of sensor. If the resistance is too low, the buzzer sounds, which means the sensor has short-circuited. If the resistance is not consistent with the sensor s resistance characteristics table, the sensor has failed. Refer to Table 4-5.1 or 4-5.3. 202008 Midea CAC Confidential...
  • Page 46 EA indicates a discharge temperature sensor error. M thermal Mono stops running. Error code is displayed on outdoor unit main PCB and user interface. 4.6.3 Possible causes Temperature sensor not connected properly or has malfunctioned. Damaged outdoor unit main PCB. 202008 Midea CAC Confidential...
  • Page 47 Set a multi-meter to buzzer mode and test any two terminals of sensor. If the resistance is too low, the buzzer sounds, which means the sensor has short-circuited. If the resistance is not consistent with the sensor s resistance characteristics table, the sensor has failed. Refer to Table 4-5.1, and Table 4-5.2. 202008 Midea CAC Confidential...
  • Page 48 Hydronic system main PCB EEPROM Ensure the EEPROM is connected not connected properly properly Replace hydronic system main PCB Notes: Hydronic system main PCB EEPROM is designated IC39 on the main PCB for hydronic system (labeled 31 in Figure 4-2.1). 202008 Midea CAC Confidential...
  • Page 49 LED on the Inverter Voltage of PN is 380V. Check the main board. Modules is lighting The input power of The main board is inverter module is damaged, change it. abnormal The invert module is damaged, change it. 202008 Midea CAC Confidential...
  • Page 50 Outdoor unit invert module EEPROM Ensure the EEPROM is connected not connected properly properly Replace outdoor unit invert module Notes: Outdoor unit invert module EEPROM is designated IC25 on the outdoor unit invert module (labeled 14 in Figure 4-2.3).. 202008 Midea CAC Confidential...
  • Page 51 Error code is displayed on hydronic system main PCB, outdoor unit main PCB and user interface. 4.10.3 Possible causes Power supply abnormal. Transformer malfunction. Interference from a source of electromagnetic radiation. Outdoor unit main PCB or hydronic system main PCB damaged. 202008 Midea CAC Confidential...
  • Page 52 Measure the voltages of transformer output port ports. If the voltages are not normal, the transformer has malfunctioned. 202008 Midea CAC Confidential...
  • Page 53 There is a source of electromagnetic radiation near the unit, such as Remove the source of interference high-frequency transmitter or other high strength radiation device Replace outdoor unit main PCB and inverter driven module in turn 202008 Midea CAC Confidential...
  • Page 54 Error code is displayed on outdoor unit main PCB and user interface. 4.12.3 Possible causes DC fan wire is loosed. High wind speed. Fan motor blocked or has failed. Invert module damaged. Main PCB is damaged. 202008 Midea CAC Confidential...
  • Page 55 The normal voltage is 15V when the unit is in standby. If the voltage is significantly different from 15V, the IPM module on the inverter module is damaged. DC fan connection is CN107/109 on the outdoor unit refrigerant system main PCB (labeled 23 in Figure 4-2.2). 202008 Midea CAC Confidential...
  • Page 56 Power supply voltage not within 90%~110% of rated voltage. Outdoor unit main PCB is damaged. 4.13.4 Procedure Power supply voltage is not within Provide normal power supply 90%~110% of rated voltage Replace outdoor unit main PCB 202008 Midea CAC Confidential...
  • Page 57 Measure the resistance among the three terminals of the pressure sensor. If the resistance is of the order of mega Ohms or infinite, the pressure sensor has failed. The pressure sensor connection is port CN6 on the outdoor unit refrigerant system main PCB (labeled 3 in Figure 4-2.2). 202008 Midea CAC Confidential...
  • Page 58 Low pressure switch not connected properly or has malfunctioned. Insufficient refrigerant. Low pressure side blockage. Poor evaporator heat exchange in heating mode or DHW mode. Insufficient water flow in cooling mode. Outdoor unit main PCB damaged. 202008 Midea CAC Confidential...
  • Page 59 For normal system parameters. Check air side heat exchanger, fan and air outlets for dirt/blockages. Check water side heat exchanger, water piping, circulator pumps and water flow switch for dirt/blockages. 202008 Midea CAC Confidential...
  • Page 60 Error code is displayed on outdoor unit main PCB and user interface. 4.16.3 Possible causes Pressure sensor/switch not connected properly or has malfunctioned. Excess refrigerant. System contains air or nitrogen. High pressure side blockage. Poor condenser heat exchange. Outdoor unit main PCB damaged. 202008 Midea CAC Confidential...
  • Page 61 In heating mode check water side heat exchanger, water piping, circulator pumps and water flow switch for dirt/blockages. In cooling mode check air side heat exchanger, fan(s) and air outlets for dirt/blockages. Check water pressure on the manometer. If the water pressure is not > 1 bar, water flow is insufficient. Refer to Figure 2-1.1. 202008 Midea CAC Confidential...
  • Page 62 Mono stops running. When the current returns to the normal range, P3 is removed and normal operation resumes. Error code is displayed on refrigerant system main PCB and user interface. 4.17.3 Possible causes Poor condenser heat exchange. High pressure side blockage. Inverter module damaged. Compressor damaged. Outdoor unit main PCB damaged. 202008 Midea CAC Confidential...
  • Page 63 The normal resistances of the inverter compressor are 0.7- 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. 202008 Midea CAC Confidential...
  • Page 64 Mono stops running. When the discharge temperature falls below 90°C, P4 is removed and normal operation resumes. Error code is displayed on refrigerant system main PCB and user interface. 4.18.3 Possible causes Temperature sensor error. High pressure side blockage. Poor condenser heat exchange. Outdoor unit main PCB damaged. 202008 Midea CAC Confidential...
  • Page 65 Discharge pipe temperature sensor connection is port CN8 on the outdoor unit refrigerant system main PCB (labeled 5 in Figure 4-2.2). Final outlet water temperature sensor and water side heat exchanger water outlet temperature sensor connections are port CN6 on the hydronic system 202008 Midea CAC Confidential...
  • Page 66 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. Check air side heat exchanger, fan and air outlets for dirt/blockages. Check the water side heat exchanger, water piping, circulator pumps and water flow switch for dirt/blockages. 202008 Midea CAC Confidential...
  • Page 67 M thermal Mono stops running. Error code is displayed on hydronic system main PCB and user interface. 4.19.3 Possible causes Temperature sensor not connected properly or has malfunctioned. Water piping contains air. Insufficient water flow. Hydronic system main PCB damaged. 202008 Midea CAC Confidential...
  • Page 68 If the resistance is not consistent with the sensor s resistance characteristics table, the sensor has failed. Refer to Table 5-5.3. Check water pressure on the manometer. If the water pressure is not > 1 bar, water flow is insufficient. Refer to Figures 2-1.1 202008 Midea CAC Confidential...
  • Page 69 MCE error(DC bus low or high voltage protection or software over current protection) Zero speed protection Compressor frequency variation greater than 15Hz within one second protection Actual compressor frequency differs from target frequency by more than 15Hz protection 202008 Midea CAC Confidential...
  • Page 70 380-415V AC power supply change to DC power supply after bridge rectifier. Contactor is open the current across the PTC to charge capacitor, after 5 seconds the contactor closed. The capacitor output steady 540V DC power supply for inverter module P N terminals. 202008 Midea CAC Confidential...
  • Page 71 When replacing an inverter module, a layer of thermally conductive silica gel should be painted on the IPM module (on the reverse side of the inverter module PCB). Refer to Figure 4-4.3. Figure 4-4.2: F0 and GND voltage on IC28-1 F0 IC28-4 GND Vnormal = 5V IC28-1 F0 IC28-4 GND Figure 4-4.3: Replacing an inverter module 202008 Midea CAC Confidential...
  • Page 72 N terminal of capacitor. Refer to Figure 4-4.4. Figure 4-4.4: DC bus wire connection L1L2L3,PIN- POUT L1 L2 L3 Pin Pout The normal resistances of the inverter compressor are 0.7- differ from these specifications, the compressor has malfunctioned. 202008 Midea CAC Confidential...
  • Page 73 Figure 4-4.5: Connection port for inverter module When replacing an inverter module, a layer of thermally conductive silica gel should be painted on the IPM module (on the reverse side of the inverter module PCB). Refer to Figure 4-4.3. 202008 Midea CAC Confidential...
  • Page 74 Use clip-on ammeter to measure the compressor current, if the current is normal indicates the inverter module is failed, if the current is abnormal indicates the compressor has failed. Situation 5: L0 error appears occasionally/irregularly The outdoor unit ventilation is not good Ensure enough space for unit ventilation 202008 Midea CAC Confidential...
  • Page 75 DC voltage between terminal P and N is Check power supply, three phase bridge abnormal rectifier Replace the main PCB Notes: P N +15V terminal on refrigerant system main PCB. Refer to Figure4-4.9. Voltage between N and +15. Refer to Figure4-4.7 202008 Midea CAC Confidential...
  • Page 76 (terminals 1, 2 and 3) in turn. The voltage between terminal 4 and each of terminals 1, 2 and 3 should be infinite. If the voltage is 0, the bridge rectifier has failed. Figure 4-4.8: Bridge rectifier Three phase AC power input DC power output Schematic diagram 202008 Midea CAC Confidential...
  • Page 77 Re-start the unit, use clip-on ammeter to measure the compressor current, if the current is normal indicates the compressor is failed, if the current is abnormal indicates the inverter PCB is failed.. 4.20.9 L5/L8/L9 troubleshooting L5/L8/L9 The wire is not connected properly Ensure wire is connected properly Inverter module PCB has malfunctioned Replace inverter module PCB Replace the compressor 202008 Midea CAC Confidential...
  • Page 78 M thermal Mono stops running. Error code is displayed on outdoor unit main PCB and user interface. 4.21.3 Possible causes Temperature sensor not connected properly or has malfunctioned. Poor condenser heat exchange. Fan motor damaged. Hydronic system main PCB damaged. 202008 Midea CAC Confidential...
  • Page 79 If the resistance is not consistent with the sensor s resistance characteristics table, the sensor has failed. Refer to Table 4-5.1. Check air side heat exchanger, fan and air outlets for dirt/blockages. High pressure switch connection is port CN31 on the outdoor unit refrigerant system main PCB (labeled 21 in Figure 4-2.2) 202008 Midea CAC Confidential...
  • Page 80 Error code is displayed on hydronic system main PCB and user interface. Hb indicates PP has displayed 3 times. 4.22.3 Possible causes Temperature sensor not connected properly or has malfunctioned. 4-way valve is blocked or damaged. Hydronic system main PCB damaged. 202008 Midea CAC Confidential...
  • Page 81 If the resistance is not consistent with the sensor s resistance characteristics table, the sensor has failed. Refer to Table 4-5.3 Restart the unit in cooling mode to change the refrigerant flow direction. If the unit does not operate normally, the 4-way valve is blocked or damaged. 202008 Midea CAC Confidential...
  • Page 82 The space between the units is too narrow for heat exchanger. Heat exchanger is dirty or something is block on the surface. Fan is not running. Water flow rate is low. Water outlet temp. sensor is loosen or broken. 202008 Midea CAC Confidential...
  • Page 83 Set a multi-meter to buzzer mode and test any two terminals of sensor. If the resistance is too low, the buzzer sounds, which means the sensor has short-circuited. If the resistance is not consistent with the sensor s resistance characteristics table, the sensor has failed. Refer to Table 4-5.3. 202008 Midea CAC Confidential...
  • Page 84 Digital display output 4.24.2 Description PED PCB failure M thermal Mono stops running. Error code is displayed on hydronic system main PCB and user interface. 4.24.3 Possible causes Power supply problem. PED board broken. IPM module broken. 202008 Midea CAC Confidential...
  • Page 85 Replace PED PCB and power on again. IPM module broken. Replace IPM module and power on again. Notes: PED is labeled 13 in Figure 4-2.3. 202008 Midea CAC Confidential...
  • Page 86 5 system will resume 2. Water side heat exchanger water outlet temperature/water automatically inlet temperature/backup electric heater outlet water temperature 2 Notes: Refer to Part 3, 5.7 Water Side Heat Exchanger Anti-freeze Protection Control . 202008 Midea CAC Confidential...
  • Page 87 Temperature collecting plate(Optional) connection wire is not connected. Temperature collecting plate(Optional) is damaged. 4.26.4 Procedure Temperature collecting plate Check the connection line and joint. connection wire is not connected. Temperature collecting plate Replace temperature collecting plate damaged. 202008 Midea CAC Confidential...
  • Page 88 Part 2. Make sure wires Wire connection problem are connected effectively and no strong electricity or strong magnetic interference. Add network matching wire between ports H1 and Communication between units is unstable H2 at the terminal of the communication system 202008 Midea CAC Confidential...
  • Page 89 M thermal Mono Address code missing or address code setting duplicate Reset address code by another controller Main board fuse is damaged Replace main board 202008 Midea CAC Confidential...
  • Page 90 29.528 4.571 1.041 28.026 4.387 1.007 26.608 4.213 0.974 25.268 4.046 0.942 24.003 3.887 0.912 22.808 3.735 0.883 21.678 3.59 0.855 20.61 3.451 0.828 19.601 3.318 0.802 18.646 3.191 0.777 17.743 3.069 0.753 16.888 2.952 0.73 202008 Midea CAC Confidential...
  • Page 91 1.717 115.2 20.46 5.157 1.674 109.8 19.69 5.000 1.632 104.6 18.96 4.849 99.69 18.26 4.703 95.05 17.58 4.562 90.66 16.94 4.426 86.49 16.32 4.294 82.54 15.73 4.167 78.79 15.16 4.045 75.24 14.62 3.927 71.86 14.09 3.812 202008 Midea CAC Confidential...
  • Page 92 176.840 28.269 6.5228 168.001 27.139 6.3114 159.653 26.061 6.1078 151.766 25.031 5.9117 144.311 24.048 5.7228 137.264 23.109 5.5409 130.599 22.212 5.3655 124.293 21.355 5.1965 118.326 20.536 5.0336 112.679 19.752 4.8765 107.330 19.003 4.7251 102.265 18.286 4.5790 202008 Midea CAC Confidential...
  • Page 93 Note: Product specifications change from time to time as product improvements and developments are released and may vary from those in this document. GD MIDEA Heating & Ventilating Equipment Co. Ltd participates in the ECP programme for LCP-HP. Check ongoing validity of certificate: www. eurovent-certification.com...

This manual is also suitable for:

Mhc-v18w/d2rn8Mhc-v22w/d2rn8Mhc-v26w/d2rn8Mhc-v30w/d2rn8