Midea Aqua thermal Super Series Service Manual
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Midea Aqua thermal Super Series Service Manual

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Midea Building Technologies Division
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Aqua thermal Super Series
All DC Inverter
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Summary of Contents for Midea Aqua thermal Super Series

  • Page 1 Midea Building Technologies Division Service Manual Aqua thermal Super Series All DC Inverter MBT Confidential...
  • Page 2 Aqua thermal Super CONTENTS Part 1 General Information ................3 Part 2 Component Layout and Refrigerant Circuits ........5 Part 3 Control ....................15 Part 4 Diagnosis and Troubleshooting ............33 MBT Confidential...
  • Page 3 Aqua thermal Super MBT Confidential...
  • Page 4 Aqua thermal Super Part 1 General Information Unit Capacities and External Appearance..........4 Water outlet temperature range ............4 MBT Confidential...
  • Page 5 Aqua thermal Super 1 Unit Capacities and External Appearance MH-SU65-RN8L/ MH-SU65M-RN8L MH-SU110-RN8L/ MH-SU110M-RN8L Model MH-SU75-RN8L/ MH-SU75M-RN8L MH-SU140-RN8L/ MH-SU140M-RN8L Power supply 380-415V/3Ph/50Hz 380-415V/3Ph/50Hz Appearance 2 Water outlet temperature range Heating and cooling operating range Hot water range Cold water range -12, 62 -10, 65 36, 65 40, 63...
  • Page 6 Aqua thermal Super Part 2 Component Layout and Refrigerant Circuits 1 Layout of Functional Components .............. 6 2 Piping and Refrigerant Flow Diagrams ............10 MBT Confidential...
  • Page 7 Aqua thermal Super 1 Layout of Functional Components MH-SU65-RN8L / MH-SU75-RN8L Component Component Air outlet Condenser Top cover Water outlet Electric control box Air inlet Compressor Water inlet Evaporator Wire controller (It can be placed indoors) MBT Confidential...
  • Page 8 Aqua thermal Super MH-SU65M-RN8L / MH-SU75M-RN8L Component Component Air outlet Water outlet Top cover Air inlet Electric control box Water inlet Compressor Wire controller (It can be placed indoors) Evaporator Expansion tank Water pump Condenser MBT Confidential...
  • Page 9 Aqua thermal Super MH-SU110-RN8L / MH-SU140-RN8L Component Component Main parts of 110 Air outlet Condenser Top cover Water outlet Electric control box Air inlet Compressor Water inlet Evaporator Wire controller (It can be placed indoors) MBT Confidential...
  • Page 10 Aqua thermal Super MH-SU110M-RN8L / MH-SU140M-RN8L Component Component Air outlet Water outlet Top cover Air inlet Electric control box Water inlet Compressor Wire controller (It can be placed indoors) Evaporator Expansion tank Water pump Condenser MBT Confidential...
  • Page 11 Aqua thermal Super 2 Piping and Refrigerant Flow Diagrams For 65/75 kW High temperature, high press gas High temperature, high press liquid Low temperature, low press Cooling operation FAN1 FAN2 outlet EXVA 45 46 DN50 Taf1 EXVC Taf2 inlet DN50 DD110 EXVB Heat1...
  • Page 12 Aqua thermal Super Legend Symbol Description Symbol Description Enhanced vapor injection solenoid valve L-YL Low pressure sensor Crankcase heater L-PRO Low pressure switch Muffler GL/S Vapor-liquid separator DC inverter compressor EXVA Heating Electronic expansion valve Tp-pro Discharge temperature switch 1 Plate heat exchanger Discharge temperature sensor 1 T6A /T6B...
  • Page 13 Aqua thermal Super For 110/140 kW High temperature, high press gas High temperature, high press liquid Low temperature, low press Cooling operation FAN1 FAN2 16mm outlet 38 39 EXVA DN65 Taf1 EXVC Taf2 inlet DN65 DD110 Heat2 W-Heat on/off Heating operation FAN1 FAN2 16mm...
  • Page 14 Aqua thermal Super Legend Symbol Description Symbol Description Crankcase heater Taf1 Antifreeze temperature sensor 1 DC inverter compressor Taf2 Antifreeze temperature sensor 2 Discharge temperature sensor 1 Plate heat exchanger SV8A Enhanced vapor injection solenoid valve T3A/B Temperature sensor Muffler Safety valve Discharge temperature switch 1 Water drain...
  • Page 15 Aqua thermal Super functions as an evaporator and water side heat exchanger function as a condenser. Vapor-liquid separator: Stores liquid refrigerant to protect the compressor from liquid hammering. Oil separator: Separates oil from gas refrigerant pumped out of the compressor and quickly returns it to the compressor. Separation efficiency is up to 99%.

  • Page 16: Table Of Contents

    Aqua thermal Super Part 3 Control 1 General Control Scheme Flowchart ............16 2 Stop Operation ..................17 3 Standby Control ..................17 4 Startup Control ..................19 5 Normal Operation Control ............... 21 6 Protection Control ................... 26 7 Special Control ..................30 MBT Confidential...

  • Page 17: General Control Scheme Flowchart

    Aqua thermal Super 1 General Control Scheme Flowchart Stop operation  Abnormal shutdown  System stops Standby control  Crankcase heater control  Water pump control Special control Startup control  Compressor startup delay control  Startup control for heating operation ...

  • Page 18: Stop Operation

    Aqua thermal Super 2 Stop Operation The stop operation occurs for one of the following reasons: 1. Abnormal shutdown: in order to protect the compressors, if an abnormal state occurs the system makes a stop with thermo off operation and an error code is displayed on the outdoor unit’s PCB digital displays and on the user interface. 2.
  • Page 19 Aqua thermal Super When S1-4=OFF, it is the single inverter water pump of the unit machine Inverter water pump control (default). Selection When S1-4=ON, the unit inverter water pump and fixed frequency pump are connected in parallel When S1-3=OFF, single pump control (one set of system, one main pump, Single pump/ Multiple pump main engine control) When S1-3=ON, multi-pump control (one pump per machine, each control)

  • Page 20: Startup Control

    Aqua thermal Super 4 Startup Control 4.1 Compressor Startup Delay Control In initial startup control and restart control (except in defrosting operation), compressor startup is delayed such that a minimum 7 minutes has elapsed since the compressor stopped, in order to prevent frequency compressor on/off and to equalize the pressure within the refrigerant system.
  • Page 21 Aqua thermal Super 4.3 Startup Control for Cooling Operation Wiring diagram Component 65/75kW 110/140kW Control functions and states label Non-standard component: After the pump is turned on for 2 minutes, detect the water flow ● ● Water pump PUMP switch continuously. The compressor can be started only after the water flow is normal.

  • Page 22: Normal Operation Control

    Aqua thermal Super 5 Normal Operation Control 5.1 Component Control during heating mode Wiring 65/75kW 110/140kW Control functions and states Component diagram label ● ● Water pump PUMP Open Inverter compressor ● ● Control the outlet water temperature. The operating increased and decreased frequency is 1Hz/s.
  • Page 23 Aqua thermal Super Enhanced vapor injection EXV, Step from 0 to 480. Controlled according to temperature Electronic expansion ● ● EXV-C valve difference between economizer plate heat exchanger inlet and outlet. ● ● Closed Four-way valve ● ● Closed Solenoid valve (defrost) ●...
  • Page 24 Aqua thermal Super  Startup: Adjust from 480 to the initial position, (the initial opening is determined by the ambient temperature), maintain for a period of time. EXV is controlled according to suction superheat, exhaust, and compressor speed.  When the outdoor unit is in standby: The EXV is at position 480 (steps).
  • Page 25 Aqua thermal Super For 110/140kW:: Fan speed (rpm) Fan speed index FAN A FAN B MBT Confidential...
  • Page 26 Aqua thermal Super Fan speed index The conditions required for Fan operation mode 75/140kW implementation 65kW 110kW standard mode Set by wire control Night silent mode 1 Set by wire control Night silent mode 2 T3min≥40℃ Forced exit. Night silent mode 3 Can enter when T3min≤35℃.

  • Page 27: Protection Control

    Aqua thermal Super 6 Protection Control 6.1 High Pressure Protection Control This control protects the refrigerant system from abnormally high pressure and protects the compressor from transient spikes in pressure. Normal operation > 4.3MPa < 3.2MPa When P0 protection occurs 3 times in 60 minutes, a manual system restart is High pressure protection, error code P0 is displayed required before the system can...
  • Page 28 Aqua thermal Super 6.4 Compressor and Inverter Module Protection Control The protection current for 65&75kW are 53A, for 110&140kW are 106A. Normal operation Current > protection current Current < protection current CL is displayed when PL error occurs 3 times in 100 minutes, a manual Compressor current protection, error code P4/P5 is displayed system restart is required before the system can resume operation.
  • Page 29 Aqua thermal Super 6.8 Air Side Heat Exchanger High Temperature Protection Control This control protects the air side heat exchanger from high temperature. Normal operation T3 < 55°C T3 > 62°C High temperature protection, error code P7 is displayed Note: 1.
  • Page 30 Aqua thermal Super 6.11 Water Side Heat Exchanger Low Pressure Protection Control This control protects the water side heat exchanger from ice formation.  Normal cooling mode Normal operation 0.5Mpa≤ Pe < 0.6Mpa for 30s Unit stops Or Pe < 0.5Mpa for 5s Low pressure protection, error code PC is displayed In normal cooling mode, when 0.5Mpa≤...

  • Page 31: Special Control

    Aqua thermal Super 7 Special Control 7.1 Outdoor Unit Duty Cycling In systems with multiple outdoor units, outdoor unit duty cycling is used to balance the compressor running time. Outdoor unit duty cycling occurs whenever all the outdoor units stop running (either because the leaving water set temperature has been reached or because a master unit error has occurred): Take 16 units in parallel as an example: ...
  • Page 32 Aqua thermal Super 7.2 Defrosting Operation 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 temperature, water inlet temperature, compressor running time and defrosting time.
  • Page 33 Aqua thermal Super MBT Confidential...
  • Page 34 Aqua thermal Super Part 4 Diagnosis and Troubleshooting 1 Electric Control Box Layout ............... 34 2 PCB Introduction ..................36 3 Wiring diagram ..................45 4 Check Code Table ..................49 5 Troubleshooting ..................53 6 Drive Module Failure ................88 7 Compressor replacement procedure ............

  • Page 35: Electric Control Box Layout

    Aqua thermal Super 1 Electric Control Box Layout For MH-SU65-RN8L and MH-SU75-RN8L Main control board Inductor Fan module board (Fan B) Expanding board AC filter board PED board Main power supply wiring set Module components (Compressor + Fan A) For MH-SU110-RN8L and MH-SU140-RN8L Main control board AC filter board A Inductor A...
  • Page 36 Aqua thermal Super For MH-SU65M-RN8L and MH-SU75M-RN8L Main control board Inductor Fan module board (Fan B) Expanding board AC filter board PED board Main power supply wiring set Module components (Compressor + Fan A) For MH-SU110M-RN8L and MH-SU140M-RN8L Main control board AC filter board A Inductor A Inductor B...

  • Page 37: Pcb Introduction

    Aqua thermal Super 2 PCB Introduction 2.1 Types Aqua thermal Super 65&75kW unit have one main control board, one compressor inverter module boards, two DC fan inverter module boards and one filter board. Aqua thermal Super 110&140kW unit have one main control board, two compressor inverter module boards, two DC fan inverter module boards and two filter boards.
  • Page 38 Aqua thermal Super CN49 One-way solenoid valve 220-240V CN84 SV8A One-way solenoid valve 220-240V CN83 SV8B One-way solenoid valve 220-240V CN93 ALARM Fault alarm port CN65 USB program burning port DC5V CN28 PH-PRO Three-phase protector signal detection port DC12V External unit parallel connection communication port & CN22 DC5V external unit and wired controller communication port...
  • Page 39 Aqua thermal Super Main PCB field setting Multiple pumps control: output pump signal on all units. Single pump control: only the master unit output pump signal, no pump signal output on the slave units. Default factory Switch Description setting S1-1 Control mode Remote control Normal control...
  • Page 40 Aqua thermal Super Spot Check Description The spot check sequence is shown as follows: Serial Contents of spot check number Standby: host address (left 88) + number of online units (right 88), Power-on: display frequency Defrosting: dFdF 0.xx Host address 1.xx Number of external units (e.g.
  • Page 41 Aqua thermal Super 42.xx Te (saturation temperature corresponding to low pressure) spot check value + 30 43.xx 44.xx 45.xx Version number of main control software 46.xx Extension board software version number 47.xx The last failure 48.xx Penultimate failure 49.xx Third failure from the bottom 50.xx...
  • Page 42 Aqua thermal Super 2.3 Compressor Inverter Module Board Compressor Inverter Module PCB component For 65/75/110/140kW Label Code Port Explanation Voltage P-in Reactor input to module board terminals P-out Module board outputs to reactor terminal CN16 Power supply for module board 380-415V CN15 CN17...
  • Page 43 Aqua thermal Super Compressor Inverter Module PCB field setting Switch Description S7-1 S7-2 Compressor A inverter module address setting Compressor B inverter module address setting 2.4 Fan Module Board For 65/75kW Label Code Port Explanation Voltage Fan module control power supply input DC19V port CN12...
  • Page 44 Aqua thermal Super 2.5 AC Filter Board For 65/75/110/140kW Label Code Port Explanation Voltage Input port L1 Input port L2 380-415V Input port L3 Input port N CN11 Power supply port for main PCB Port for three phase protector CN12 380-415V (reserve) L3’...
  • Page 45 Aqua thermal Super 2.7 Slave PCB Board For 65/75/110/140kW Label Code Port Explanation Voltage CN140 POWER Slave PCB board strong power supply 220-240V CN115 W-HEAT Water pipe electric heating belt 220-240V Three-way valve for making hot water (used for customized CN125 3-way valve 220-240V...

  • Page 46: Wiring Diagram

    Aqua thermal Super 3 Wiring diagram 3.1 Single unit For 65/75/110/140kW MBT Confidential...
  • Page 47 Aqua thermal Super Default factory Switch Description setting S1-1 Control mode Remote control Normal control Multiple water pumps Single water S1-3 Water pump control pump control Single variable frequency water pump Single variable S1-4 Water pump plus single constant frequency water frequency water pump pump control control...
  • Page 48 Aqua thermal Super 3.2 Multiple units For 65/75kW CN46 CN46 0-10V 3-way valve A C 1 CN46 MBT Confidential...
  • Page 49 Aqua thermal Super For 110/140kW CN46 CN46 IN 2 0-10V 3-way valve A C 2 A C 1 CN46 MBT Confidential...

  • Page 50: Check Code Table

    Aqua thermal Super 4 Check Code Table 4.1 Unit No. Code Content Recovery condition The capability selection is inconsistent with Main control Model setting error the actual model, power on again after setting (Other Model Main control EPROM error) correctly Phase sequence error of main control board check Automatic recovery after the fault is rectified Communication failure between master and the Automatic recovery after the fault is rectified...
  • Page 51 Aqua thermal Super No. Code Content Recovery condition Automatic recovery after the fault is rectified Cooling evaporator pressure too low for 3 times in 60 minutes (Recovered by power off) Automatic recovery after the fault is rectified Cooling evaporator low temperature antifreeze for 3 times in 60 minutes protection (Recovered by power off)
  • Page 52 Aqua thermal Super L20 Module over temperature protection Over temperature fault No. Code Content Recovery condition L30 Low bus voltage error L31 High bus voltage error Power fault L32 Excessively high bus voltage error L34 Phase loss error L43 Phase current sampling bias abnormal L45 Motor code not match hardware fault L46 IPM protection...
  • Page 53 Aqua thermal Super Clean the cooling ribs of The motor heats. the motor. E020 immediate 300s 300s The motor is foreseen Ambient temperature to run at an ambient higher than +40°C. temperature of +40°C. Dismantle the The motor is in motor-converter of the E023 immediate...

  • Page 54: Troubleshooting

    Aqua thermal Super 5 Troubleshooting 5.1 Warning Warning  All electrical work must be carried out by competent and suitably qualified, certified and 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 55 Aqua thermal Super 5.2 E0/H9 Troubleshooting Digital display output Description  E0 indicates that the capability dialing code of the main PCB is inconsistent with the actual model.  1H9 indicates that the driving model of IPM inverter module (compressor A) does not match. ...
  • Page 56 Aqua thermal Super 5.3 E1 Troubleshooting Digital display output Description  Phase sequence error.  Unit stops running.  Error code is displayed on main PCB and user interface. Possible causes  Power supply phases not connected in correct sequence. ...
  • Page 57 Aqua thermal Super 5.4 E2 Troubleshooting Digital display output Description  Communication error between outdoor unit and user interface.  Communication failure between master and slave units  All units stop running.  Error code is displayed on main PCB and user interface. Possible causes ...
  • Page 58 Aqua thermal Super The length of communication wire is over Reduce the wire length to less than 1200m 1200mm or strengthen the signal Replace main PCB or user interface Notes: 1. Measure the resistance among X, Y and E. The normal resistance between X and Y is 120Ω, between X and E is infinite, between Y and E is infinite.
  • Page 59 Aqua thermal Super Description  E3 indicates total water outlet temperature sensor error (valid for the main unit)  E4 unit water outlet temperature sensor error  1E5 indicates condenser tube temperature sensor T3A error  2E5 indicates condenser tube temperature sensor T3B error ...
  • Page 60 Aqua thermal Super Sensor has short-circuited or failed Replace the sensor If the fault is EP, it is also necessary to Confirm whether the exhaust sensor on confirm whether the exhaust sensor on the top of the compressor has fallen the top of the compressor has fallen Replace main PCB or expansion PCB Notes:...
  • Page 61 Aqua thermal Super Ensure all supply terminals are securely Some power supply terminals are loose fastened The power supply is abnormal Check the power supply equipment Power phase protector wire connection Check the wire connection of Power loose phase protector Replace power phase protector Error code disappear Replace Main PCB...
  • Page 62 Aqua thermal Super Procedure 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 open.
  • Page 63 Aqua thermal Super 5.8 EC Troubleshooting Digital display output Description  EC indicates that the number of slave units detected by master unit has decreased.  The slave unit that has lost contact with the main unit stops running.  Error code is only displayed on the user interface. Possible causes ...
  • Page 64 Aqua thermal Super 5.9 P0 Troubleshooting Digital display output Description  Discharge pipe high pressure or discharge temperature switch protection. When the discharge pressure rises above 4.2MPa or discharge temperature rises above 115°C, the system displays P0 protection and all units stop running. When the discharge pressure falls below 3.2MPa or discharge temperature fall below 90°C, P0 is removed and normal operation resumes.
  • Page 65 Aqua thermal Super The water flow rate is not sufficient in Inspect the water system and fix the cooling mode error Drain the refrigerant in the system, Excess refrigerant or System contains air vacuum with a vacuum pump, and refill the nominal weight of refrigerant after or nitrogen ensuring that the vacuum degree meets...
  • Page 66 Aqua thermal Super Procedure Insufficient refrigerant caused by Add refrigerant or inspect the system for refrigerant leakage leaks The low pressure side is blocked, caused Inspect the system and fix the error. If the by crushed or bent pipe, blocked EXV, or filter is blocked by ice, the piping should dirty filter be cleaned...
  • Page 67 Aqua thermal Super 5.11 P4, P5 Troubleshooting Digital display output Description  1 P4 indicates system A current protection  2 P4 indicates system A DC bus current protection  1 P5 indicates system B current protection  2 P5 indicates system B DC bus current protection ...
  • Page 68 Aqua thermal Super Procedure P4/P5 The power supply is abnormal Check the power supply equipment Discharge part of the refrigerant. Add oil Excess refrigerant if it leaks during discharge refrigerant process Flush all refrigerant then vacuum the System contains air or nitrogen system and recharge refrigerant.
  • Page 69 Aqua thermal Super 5.12 P7 Troubleshooting Digital display output Description  High temperature protection of air side heat exchanger tube temperature sensor “T3a / T3b” in cooling mode. When the tube temperature of air side heat exchanger is higher than 62°C, the system displays P7 protection and the faulty unit stops running.
  • Page 70 Aqua thermal Super 5.13 P9 Troubleshooting Digital display output Description  Water inlet and outlet temperature difference protection  The faulty unit stops running.  Error code is displayed on main PCB and user interface. Possible causes  Temperature sensor not connected properly or has malfunctioned. ...
  • Page 71 Aqua thermal Super 5.14 Pb Troubleshooting Digital display output Description  Water side heat exchanger anti-freeze protection.  The unit enters anti-freezing mode (When the unit is a single water pump, all the units jointly determine the entry and exit conditions of anti-freezing protection. When multiple water pumps are used, the main unit and slave units respectively determine the entry and exit conditions of anti-freezing protection).
  • Page 72 Aqua thermal Super 5.15 PC Troubleshooting Digital display output Description  Water side heat exchanger low pressure protection.  The faulty unit stops running.  Error code is displayed on main PCB and user interface. Possible causes  Low pressure switch not connected properly or has malfunctioned. ...
  • Page 73 Aqua thermal Super 2. 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. 3. To check for insufficient refrigerant: 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.
  • Page 74 Aqua thermal Super 5.17 PE Troubleshooting Digital display output Description  Water side heat exchanger low temperature antifreeze protection.  The faulty unit stops running.  Error code is displayed on main PCB and user interface. Possible causes  Temperature sensor not connected properly or has malfunctioned. ...
  • Page 75 Aqua thermal Super 2. Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor’s resistance characteristics table, the sensor has failed. Refer to Part 4, 6.1 “Temperature Sensor Resistance Characteristics”. 3.
  • Page 76 Aqua thermal Super 5.19 PU/FF Troubleshooting Digital display output Description  1PU/FF indicates fan A module protection.  2PU/FF indicates fan B module protection.  FF indicates PU protection has displayed 10 times. When a FF occurred, a manual system restart is required before the system can resume operation.
  • Page 77 Aqua thermal Super Procedure PU/FF Some power wires or communication Ensure power and communication wires wires of fan module are not connected are connected properly properly Remove obstruction or replace the fan The fan motor is blocked or has failed motor The power supply is abnormal Check the power supply equipment...
  • Page 78 Aqua thermal Super Procedure F0 error Reset the compressor Compressor inverter module address inverter module address via setting is incorrect dial switch S7 on inverter module Communication wire from outdoor Reconnect the main PCB CN26 to inverter module CN8/ communication wire CN9 is loosened Check the power supply LED3 on inverter module...
  • Page 79 Aqua thermal Super 3. LED3 on inverter module 4. Check the wired connection between CN5/CN6/CN7 of filter board and CN6/CN7/CN15 of compressor module board, the normal voltage should be 380-415VAC MBT Confidential...
  • Page 80 Aqua thermal Super 5.21 H5 Troubleshooting Digital display output Description  Abnormal power supply voltage.  The faulty unit stops running.  Error code is only displayed on main PCB and user interface. Possible causes  Outdoor unit power supply voltage at or above 265V or drops below 170V or a phase is missing. ...
  • Page 81 Aqua thermal Super 5.22 F6 Troubleshooting Digital display output Description  1F6 indicates A system buss voltage error (PTC)  2F6 indicates B system buss voltage error (PTC)  Only occurred in standby status.  Error code is displayed on main PCB and user interface. Possible causes ...
  • Page 82 Aqua thermal Super Procedure Electronic expansion valve coil Ensure the sensor is connected properly connection on main PCB is loose Electronic expansion valve coil has Replace the EXV malfunctioned Replace outdoor main PCB Notes: 1. Electronic expansion valve coil connections are port CN70, CN71 and CN72 on the main PCB (labeled 31, 32,30 in Part 4, 2.2.1 Main PCB component) 2.
  • Page 83 Aqua thermal Super Procedure Discharge temperature sensor Ensure the sensor is connected properly connection on main PCB is loose Temperature or pressure sensor has Replace the sensor short-circuited or failed Ensure that the sensor is installed in an Discharge pipe temperature sensor at accurate position and well insulated the top of the compressor falls or is not insulated.
  • Page 84 Aqua thermal Super 5.25 F4 Troubleshooting Digital display output Description  1F4 module A L0 or L1 protection occurs for 3 times in 60 minutes  2F4 module B L0 or L1 protection occurs for 3 times in 60 minutes ...
  • Page 85 Aqua thermal Super 5.27 bH troubleshooting Digital display output Description  bH indicates adhesion of compressor relay or PED board damaged  The faulty unit stops running.  Error code is only displayed on main PCB and user interface. Possible causes ...
  • Page 86 Aqua thermal Super Procedure Pressure sensor damaged Replace high pressure sensor Replace main control board Note: 1． Pressure sensor connection is port CN40 on the main PCB (labeled 20 in Part 4, 2.2.1 Main PCB component). 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.
  • Page 87 Aqua thermal Super 5.30 PA troubleshooting Digital display output Description  PA indicates abnormal water inlet and outlet temperature difference protection  The faulty unit stops running.  Error code is only displayed on main PCB and user interface. Possible causes ...
  • Page 88 Aqua thermal Super Possible causes  Evaporator pressure less than 0.6MPa  Water flow is too low  Electronic expansion valve damaged  Pressure sensor damaged  Main control board damaged Procedure Check whether the water system is clean Water flow is too low and water pump is running Check whether the electronic expansion Replace electronic expansion valve...

  • Page 89: Drive Module Failure

    Aqua thermal Super 6 Drive Module Failure 6.1 Check code table Error code Content Error category Need to power on again Overcurrent protection Overcurrent fault Transient phase current overcurrent protection Phase current overcurrent lasts 30s protection Module over temperature protection Over temperature fault Low bus voltage error High bus voltage error...
  • Page 90 Aqua thermal Super 6.2 L10: Hardware overcurrent Description  The current exceeds the OCP protection value (peak value) set by the hardware or receives the FO signal from the IPM module.  After the fault, the compressor stops running. If the fault disappears after one minute, the compressor starts again. Trigger/resume condition ...
  • Page 91 Aqua thermal Super  Module board Icd op amp sampling circuit is abnormal. Procedure Drive board fault(swap the drive board to judge) Change the drive board Impurities in the refrigerant system or the compressor is momentarily stuck (noise when Change the compressor running or starting) 6.4 L20: Module overheat protection Description...
  • Page 92 Aqua thermal Super 6.5 L30: Low bus voltage protection Description  The bus voltage is lower than the low bus voltage protection threshold (350VDC) set by the software.  After the fault, the compressor stops running, and if the fault disappears after one minute, the compressor starts again. Trigger/resume condition ...
  • Page 93 Aqua thermal Super Possible causes  The input voltage is too high, resulting in high bus voltage;  The grid voltage is abnormally high instantaneously.  The module board bus voltage detection circuit is abnormal. Procedure Fault while running 1. The voltage drop and interrupt, need to rectify the Report error while in standby power supply...
  • Page 94 Aqua thermal Super terminal is not tightened, or disconnect other electrical equipment that shares the power supply with the unit.  Reset method: Automatic recovery after reaching the fault exit condition one minute later. Possible causes  Abnormal system power wiring leads to phase loss, or the N line and the phase line are reversed; ...
  • Page 95 Aqua thermal Super Procedure Spot check whether the unit model matches the dial reset model dial code of the model on the main control board Whether the model of the module board matches Change the driver board the model of the compressor 6.11 L46: IPM protection (FO) Description ...
  • Page 96 Aqua thermal Super 6.13 L50: Startup failure Description  Compressor failed to start.  After the fault, the compressor stops running, and if the fault disappears after one minute, the compressor starts again. Trigger/resume condition  Trigger condition: Compressor failed to start. ...
  • Page 97 Aqua thermal Super Possible causes  The compressor casing is in poor insulation. Procedure  Disconnect the compressor wire, measure the compressor UVW resistance to ground, confirm and replace the compressor. 6.17 L65: IPM short circuit protection Description  The IPM corresponding to the compressor has short circuit protection. ...
  • Page 98 Aqua thermal Super 6.21 L6E: Open circuit of W-phase upper tube Description  Open circuit of W-phase upper tube.  After the fault, the compressor stops running, and if the fault disappears after one minute, the compressor starts again. Trigger/resume condition ...

  • Page 99: Compressor Replacement Procedure

    Aqua thermal Super 7 Compressor replacement procedure Step 1: Remove faulty compressor and remove oil  Remove the faulty compressor from the outdoor unit.  Before removing the oil, shake the compressor so as to not allow impurities to remain settled at the bottom. ...
  • Page 100 Aqua thermal Super Inspecting compressor oil This oil is black This oil is a little - it has been yellow, but is clear carbonized and transparent and the condition is acceptable This oil is still transparent but there are impurities which Cloudy or gray may clog the filter oil indicates...

  • Page 101: Appendix

    Aqua thermal Super 8 Appendix 8.1 Temperature Sensor Resistance Characteristics Resistance table of exhaust temperature sensor -- 3950K(25-50) 5K(R90) 3% (with deviation) Contains: TP1/TP2 exhaust temperature sensor R90=5KΩ±3%，B25/50=3950K± 3% Temp Resistance（KΩ） Resist.tol(%) Temp.tol(℃) （℃） Rmax R （t） Normal Rmin MAX(+) MIN(-) MAX(+) MIN(-)
  • Page 102 Aqua thermal Super 19.0 82.539 72.815 63.091 13.35 13.35 2.87 2.87 20.0 78.789 69.596 60.404 13.21 13.21 2.86 2.86 21.0 75.228 66.537 57.845 13.06 13.06 2.84 2.84 22.0 71.846 63.627 55.409 12.92 12.92 2.82 2.82 23.0 68.633 60.860 53.088 12.77 12.77 2.81 2.81...
  • Page 103 Aqua thermal Super 76.0 8.288 7.890 7.492 5.04 5.04 1.47 1.47 77.0 8.003 7.629 7.256 4.90 4.90 1.43 1.43 78.0 7.729 7.379 7.028 4.75 4.75 1.40 1.40 79.0 7.466 7.137 6.809 4.60 4.60 1.36 1.36 80.0 7.213 6.905 6.597 4.46 4.46 1.32 1.32...
  • Page 104 Aqua thermal Super Resistance table of water temperature sensor -- 3970(0-100) 2% 17.6K(R50) 3% (with deviation) Contains: Taf2 board changing anti-freezing sensor, Twi unit water inlet sensor, Two unit water outlet sensor, Tw total water outlet sensor R50=17.6± 3%，B0/100=3970± 2% Temp Resistance（KΩ）...
  • Page 105 Aqua thermal Super 64.636 61.184 57.731 5.64 5.64 1.28 1.28 20.0 21.0 61.729 58.486 55.243 5.54 5.54 1.26 1.26 22.0 58.967 55.921 52.875 5.45 5.45 1.25 1.25 56.345 53.483 50.621 5.35 5.35 1.23 1.23 23.0 24.0 53.854 51.165 48.476 5.26 5.26 1.22 1.22...
  • Page 106 Aqua thermal Super 74.0 7.818 7.461 7.105 4.78 4.78 1.45 1.45 7.565 7.215 6.866 4.85 4.85 1.48 1.48 75.0 76.0 7.322 6.978 6.635 4.92 4.92 1.50 1.50 77.0 7.087 6.750 6.414 4.99 4.99 1.53 1.53 6.861 6.531 6.201 5.05 5.05 1.56 1.56 78.0...
  • Page 107 Aqua thermal Super 128.0 1.634 1.512 1.390 8.08 8.08 3.15 3.15 1.593 1.473 1.354 8.13 8.13 3.18 3.18 129.0 130.0 1.553 1.436 1.318 8.19 8.19 3.22 3.22 131.0 1.515 1.399 1.284 8.24 8.24 3.25 3.25 1.477 1.364 1.251 8.29 8.29 3.29 3.29 132.0...
  • Page 108 Aqua thermal Super Resistance table of pipe temperature sensor -- 4100K(25-50) 10K(R25) 3% (with deviation) Contains: T6A auxiliary inlet temperature sensor, T6B auxiliary outlet temperature sensor, Th suction temperature sensor, Tz/7 heating plate exchange outlet sensor, T4 outdoor temperature sensor, T3A/T3B evaporator sensor. R25=10KΩ±3%，B25/50=4100K±...
  • Page 109 Aqua thermal Super 20.0 13.093 12.635 12.183 3.62 3.57 0.77 0.74 21.0 12.471 12.050 11.634 3.50 3.46 0.75 0.72 22.0 11.883 11.496 11.112 3.37 3.34 0.73 0.70 23.0 11.327 10.971 10.617 3.25 3.23 0.71 0.68 24.0 10.800 10.473 10.147 3.12 3.11 0.69 0.66...
  • Page 110 Aqua thermal Super 77.0 1.367 1.276 1.188 7.12 6.88 2.06 2.02 78.0 1.321 1.233 1.147 7.17 6.94 2.09 2.05 79.0 1.277 1.191 1.108 7.23 6.99 2.12 2.08 80.0 1.235 1.151 1.070 7.28 7.04 2.14 2.11 81.0 1.195 1.113 1.034 7.33 7.09 2.17 2.13...
  • Page 111 Aqua thermal Super 8.2 Normal Operating Parameters of Refrigerant System Under the following conditions, the operating parameters given in Tables should be observed:  If the outdoor ambient temperature is high, the system is being run in normal cooling mode with the following settings: temperature 5°C.
  • Page 112 Add.: Midea Headquarters Building, 6 Midea Avenue, Shunde, Foshan, Guangdong, China Postal code: 528311 mbt.midea.com / global.midea.com Midea reserves the right to change the specifications of the product, and to withdraw or replace products without prior notification or public announcement. Midea is constantly developing and improving its products. MBT Confidential...

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