Midea VC Pro MVC-224WV2WN1 Service Manual
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Midea VC Pro MVC-224WV2WN1 Service Manual

Commercial air conditioners
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Manual
MVC-224WV2WN1
MVC-280WV2WN1
MVC-335WV2WN1
MVC-400WV2WN1
MVC-450WV2WN1
MVC-500WV2WN1
Commercial Air Conditioners
Series
MVC-560WV2WN1
MVC-615WV2WN1
MVC-670WV2WN1
MVC-730WV2WN1
MVC-785WV2WN1
MVC-850WV2WN1
R410A

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Summary of Contents for Midea VC Pro MVC-224WV2WN1

  • Page 1 R410A Commercial Air Conditioners Service Manual Series MVC-224WV2WN1 MVC-560WV2WN1 MVC-280WV2WN1 MVC-615WV2WN1 MVC-335WV2WN1 MVC-670WV2WN1 MVC-400WV2WN1 MVC-730WV2WN1 MVC-450WV2WN1 MVC-785WV2WN1 MVC-500WV2WN1 MVC-850WV2WN1...
  • Page 2 VC Pro VRF 50/60Hz CONTENTS Part 1 General Information ................3 Part 2 Component Layout and Refrigerant Circuits ........11 Part 3 Control ....................23 Part 4 Field Settings ..................33 Part 5 Electrical Components and Wiring Diagrams ........39 Part 6 Diagnosis and Troubleshooting ............
  • Page 3 VC Pro VRF 50/60Hz...
  • Page 4 VC Pro VRF 50/60Hz Part 1 General Information 1 Indoor and Outdoor Unit Capacities ............4 2 External Appearance .................. 6 3 Outdoor Unit Combinations ............... 8 4 Combination Ratio ..................9...

  • Page 5: Indoor And Outdoor Unit Capacities

    VC Pro VRF 50/60Hz 1 Indoor and Outdoor Unit Capacities 1.1 Indoor Units 1.1.1 Standard indoor units Table 1-1.1: Standard indoor unit abbreviation codes Abbreviation Abbreviation Type Type code code One-way Cassette High Static Pressure Duct Two-way Cassette Wall-mounted Compact Four-way Cassette Ceiling &...
  • Page 6 VC Pro VRF 50/60Hz 1.3 Outdoor Units Table 1-1.5: Outdoor unit capacity range Capacity Model Name Combination Type MVC-224WV2WN1 MVC-280WV2WN1 10HP MVC-335WV2WN1 12HP MVC-400WV2WN1 14HP MVC-450WV2WN1 16HP MVC-500WV2WN1 18HP MVC-560WV2WN1 20HP MVC-615WV2WN1 22HP MVC-670WV2WN1 24HP MVC-730WV2WN1 26HP MVC-785WV2WN1 28HP MVC-850WV2WN1 30HP MVC-900WV2WN1 32HP...

  • Page 7: External Appearance

    VC Pro VRF 50/60Hz 2 External Appearance 2.1 Indoor Units 2.1.1 Standard indoor unit Table 1-2.1: Standard indoor unit appearance One-way Cassette Two-way Cassette Compact Four-way Cassette Four-way Cassette Medium Static Pressure Duct High Static Pressure Duct Wall-mounted Ceiling & Floor Floor Standing Console 2.1.2 Fresh air processing unit...
  • Page 8 VC Pro VRF 50/60Hz 2.3 Outdoor Units 2.3.1 Single units Table 1-2.4: Single outdoor unit appearance 8/10/12/14/16HP 18/20/22HP 24/26/28/30 (with single fan) (with dual fans) (with dual fans) 2.3.2 Combinations of units Table 1-2.5: Combination outdoor unit appearance 32HP 34/36/38/HP 40/42/44/46HP 48/50/52HP 54/56/58/60HP...

  • Page 9: Outdoor Unit Combinations

    VC Pro VRF 50/60Hz 3 Outdoor Unit Combinations Table 1-3.1: Outdoor unit combinations System capacity Number Modules Outdoor branch of units joint kit 22.4 ● 28.0 ● 33.5 ● 40.0 ● 45.0 ● 50.0 ● — 56.0 ● 61.5 ● 67.0 ●...

  • Page 10: Combination Ratio

    VC Pro VRF 50/60Hz 4 Combination Ratio Sum of capacity indexes of the indoor units Combination ratio = Capacity index of the outdoor units Table 1-4.1: Indoor and outdoor unit combination ratio limitations Maximum combination ratio Minimum Type Standard indoor Fresh air processing Fresh air processing units and combination ratio...
  • Page 11 VC Pro VRF 50/60Hz Part 2 Component Layout and Refrigerant Circuits Layout of Functional Components ............12 Piping Diagrams .................. 15 Refrigerant Flow Diagrams ..............19...
  • Page 12 VC Pro VRF 50/60Hz 1 Layout of Functional Components 8-16HP Figure 2-1.1: 8-16HP layout of functional components Legend Parts name Compressor Discharge temperature sensor High pressure sensor Oil separator Heat exchanger Electronic expansion valve (EXV) Fan motor Stop valve (liquid side) Stop valve (gas side) Accumulator Low pressure switch...
  • Page 13 VC Pro VRF 50/60Hz 18-22HP Figure 2-1.2: 18-22HP layout of functional components Legend Parts name Compressor Discharge temperature sensor High pressure sensor Oil separator Heat exchanger Electronic expansion valve (EXV) Fan motor Stop valve (liquid side) Stop valve (gas side) Accumulator Low pressure switch Solenoid valve...
  • Page 14 VC Pro VRF 50/60Hz 24-30HP Figure 2-1.3: 24-30HP layout of functional components Legend Parts name Compressor Discharge temperature sensor High pressure sensor Oil separator Heat exchanger Electronic expansion valve (EXV) Fan motor Stop valve (liquid side) Stop valve (gas side) Accumulator Low pressure switch Solenoid valve...
  • Page 15 VC Pro VRF 50/60Hz 2 Piping Diagrams 8-16HP Figure 2-2.1: 8-16HP piping diagram EXVA ° C ° C Legend Parts name Parts name Compressor Stop valve (gas side) Discharge temperature sensor Accumulator High pressure sensor Low pressure switch Oil separator Solenoid valve Heat exchanger Heat exchanger temperature sensor...
  • Page 16 VC Pro VRF 50/60Hz 18-22HP Figure 2-2.2: 18-22HP piping diagram EXVA ° C ° C Legend Parts name Parts name Compressor Stop valve (gas side) Discharge temperature sensor Accumulator High pressure sensor Low pressure switch Oil separator Solenoid valve Heat exchanger Heat exchanger temperature sensor Electronic expansion valve (EXV) Outdoor ambient temperature sensor...
  • Page 17 VC Pro VRF 50/60Hz 24-30HP Figure 2-2.3: 24-30HP piping diagram EXVA ° C ° C Legend Parts name Parts name Compressor Stop valve (gas side) Discharge temperature sensor Accumulator High pressure sensor Low pressure switch Oil separator Solenoid valve Heat exchanger Heat exchanger temperature sensor Electronic expansion valve (EXV) Outdoor ambient temperature sensor...
  • Page 18 VC Pro VRF 50/60Hz Key components: 1. 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%. 2. Accumulator: Stores liquid refrigerant and oil to protect compressor from liquid hammering. 3.
  • Page 19 VC Pro VRF 50/60Hz 3 Refrigerant Flow Diagrams 8-16HP Cooling operation Figure 2-3.1: 8-16HP refrigerant flow during cooling operation Unit on Thermostat on High temperature, high pressure gas High temperature, high pressure liquid Filter Filter Low temperature, low pressure Normal control EXVA Unit on XX°C...
  • Page 20 VC Pro VRF 50/60Hz 18-22HP Cooling operation Figure 2-3.3: 18-22HP refrigerant flow during cooling operation Unit on High temperature, high pressure gas Thermostat on High temperature, high pressure liquid Filter Filter Low temperature, low pressure Normal control EXVA Unit on XX°C Thermostat on XX°C...
  • Page 21 VC Pro VRF 50/60Hz 24-30HP Cooling operation Figure 2-3.5: 24-30HP refrigerant flow during cooling operation Unit on High temperature, high pressure gas Thermostat on High temperature, high pressure liquid Filter Filter Low temperature, low pressure Normal control EXVA XX°C Unit on Thermostat on XX°C Filter...
  • Page 22 VC Pro VRF 50/60Hz...

  • Page 23: Table Of Contents

    VC Pro VRF 50/60Hz Part 3 Control 1 General Control Scheme Flowchart ............24 2 Stop Operation ..................25 3 Startup Control ..................25 4 Normal Operation Control ................ 26 5 Protection Control ..................29 6 Special Control ..................31...

  • Page 24: General Control Scheme Flowchart

    VC Pro VRF 50/60Hz 1 General Control Scheme Flowchart Sections 3-2 to 3-6 on the following pages detail when each of the controls in the flowchart below is activated. Stop operation  Abnormal shutdown  System stops Special control  A unit stops when the load demanded decreases Thermo on Startup control Thermo on...

  • Page 25: Stop Operation

    VC Pro VRF 50/60Hz 2 Stop Operation The stop operation occurs for one of the three 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 digital displays. 2.

  • Page 26: Normal Operation Control

    VC Pro VRF 50/60Hz 4 Normal Operation Control 4.1 Component Control during Normal Operation Table 3-4.1: Component control during normal cooling operation Wiring diagram Component 8-12HP 14-16HP 18-22HP 24-30HP Control functions and states label Inverter compressor A ● ● ● ●...
  • Page 27 VC Pro VRF 50/60Hz Figure 3-4.1: Compressor priority and rotation – one outdoor unit No. 1 No. 1 No. 2 Figure 3-4.2: Compressor priority and rotation – two outdoor units ① No. 1 No. 2 No. 3 No. 4 No. 1 No.
  • Page 28 VC Pro VRF 50/60Hz fully closed.  When all outdoor units are running:  All EXVAs are controlled according to discharge temperature. 4.6 Outdoor Fan Control The speed of the outdoor unit fans is adjusted in steps, as shown in Table 3-4.2. Table 3-4.2: Outdoor fan speed steps Fan speed (rpm) Fan speed index...

  • Page 29: Protection Control

    VC Pro VRF 50/60Hz 5 Protection Control 5.1 High Pressure Protection Control This control protects the system from abnormally high pressure and protects the compressors from transient spikes in pressure. Figure 3-5.1: High pressure protection control Normal operation ≥ 4.4MPa <...
  • Page 30 VC Pro VRF 50/60Hz 5.4 Compressor and Inverter Module Protection Control This control protects the compressors from abnormally high currents and protects the inverter modules from abnormally high temperatures. It is performed for each compressor and inverter module. Figure 3-5.4: Compressor current protection control Normal operation Current ≥...

  • Page 31: Special Control

    VC Pro VRF 50/60Hz 6 Special Control 6.1 Outdoor Unit Duty Cycling In systems with multiple outdoor units, outdoor unit duty cycling is used to prevent compressor burn out due to unbalanced oil levels between outdoor units. Timing of outdoor unit duty cycling: ...
  • Page 32 VC Pro VRF 50/60Hz 6.2 Oil Return Operation In order to prevent compressors from running out of oil, the oil return operation is conducted to recover oil that has flowed out of the compressor(s) and into the piping system. This operation is performed for all units including units that are in standby.
  • Page 33 VC Pro VRF 50/60Hz Part 4 Field Settings Outdoor Unit Field Settings ..............34...
  • Page 34 VC Pro VRF 50/60Hz 1 Outdoor Unit Field Settings 1.1 PCB Switches and Switch Settings Figure 4-1.1: Outdoor unit main PCB switches Table 4-1.1: Outdoor unit main PCB switch settings Switch Setting Switch positions Description Standard static pressure (default) Low static pressure mode (reserved) Static pressure Medium static pressure mode (reserved) High static pressure mode (reserved)
  • Page 35 VC Pro VRF 50/60Hz Table 4-1.1: Outdoor unit main PCB switch settings (continued) Switch Setting Switch positions Description Auto addressing (default) Addressing S6-3 mode Manual addressing Reserved Reserved S8-1 Start-up time is 12 minutes (default) Start-up time S8-2 Start-up time is 7 minutes Reserved Reserved S8-3...
  • Page 36 VC Pro VRF 50/60Hz 1.2 Modes Set on Main PCB 1.2.1 Silent time setting 1.2.1.1 Night silent time setting Night silent mode is activated X hours after the peak daytime temperature, and is deactivated after Y hours, where X and Y are as specified in Table 4-1.2.
  • Page 37 VC Pro VRF 50/60Hz 1.2.1.2 Silent mode setting In silent mode 1 / 2 / 3 and night silent mode, the outdoor fan speed decreases gradually. In super silent mode 1 / 2 / 3 / 4, not only the fan speed decreases gradually, but also the compressor frequency decreases gradually. Table 4-1.3: Silent mode setting Switch Switch positions...
  • Page 38 VC Pro VRF 50/60Hz...
  • Page 39 VC Pro VRF 50/60Hz Part 5 Electrical Components and Wiring Diagrams 1 Outdoor Unit Electric Control Box Layout ..........40 2 Outdoor Unit Main PCB ................. 42 3 Wiring Diagrams ..................52...
  • Page 40 VC Pro VRF 50/60Hz 1 Outdoor Unit Electric Control Box Layout 8-16HP Figure 5-1.1: 8-16HP top layer of electric control box Main PCB Fliter board Inductor Power supply terminals Communication terminals block Figure 5-1.2: 8-16HP bottom layer of electric control box...
  • Page 41 VC Pro VRF 50/60Hz 18-30HP Figure 5-1.3: 18-30HP top layer of electric control box Main PCB Fliter board Power supply terminals inductor Communication terminals block Figure 5-1.4: 18-30HP bottom layer of electric control box Inverter Inverter module module Reactor Reactor Fan module Fan module...
  • Page 42 VC Pro VRF 50/60Hz 2 Outdoor Unit Main PCB 2.1 Ports Figure 5-2.1: Outdoor unit main PCB ports Notes: Label descriptions are given in Table 5-2.1.
  • Page 43 VC Pro VRF 50/60Hz Table 5-2.1: Main PCB ports Label in Port code Content Port voltage Figure 5-2.1 High pressure switch and discharge temperature switch(es) CN18 0V or 5V DC connections CN19 Low pressure switch connection 0V or 5V DC Compressor top temperature sensor (single compressor units) or compressor A compressor top temperature sensor (dual 0-5V DC (varying)
  • Page 44 VC Pro VRF 50/60Hz 2.2 Components Layout Figure 5-2.2: Outdoor unit main PCB components Dial switches DSP 2 Digital display DSP 1 Main control chip Buttons Dial switch Function of buttons SW3 to SW6 Table 5-2.2: Function of buttons SW3 to SW6 Button Function In menu mode: previous and next buttons for...
  • Page 45 VC Pro VRF 50/60Hz Menu mode Only master unit has the full menu functions, slaves units only have error codes check and cleaning functions. 1. Long press SW5 “MENU” button for 5 seconds to enter menu mode, and the digital display displays “n1”; 2.
  • Page 46 VC Pro VRF 50/60Hz Menu mode function: Table 5-2.3: Menu mode function Digital display Menu mode Remarks content Debug mode Only available for the master unit (all indoor units running in cooling mode) Maintenance mode Only available for the master unit, the system does not check the indoor units’ number. Reserved Reserved Only available for outdoor unit with two compressors.
  • Page 47 VC Pro VRF 50/60Hz How to exit specified menu mode: Table 5-2.4: Exit specified menu mode method: Menu mode Manual exit method Automatic exit method System restart Long press SW6 “OK” button when the digital Debug mode After running 120 minutes Invalid display is not in menu selection state Maintenance mode...
  • Page 48 VC Pro VRF 50/60Hz Table 5-2.5: System check (continued) DSP1 Parameters displayed on DSP2 Remarks content 34.-- Address of VIP indoor unit 35.-- Reserved 36.-- Reserved 37.-- Refrigerant quantity Refer to Note 7 38.-- Reserved 39.-- Power mode Refer to Note 8 “--“...
  • Page 49 VC Pro VRF 50/60Hz 3 Compressor Inverter Module 3.1 Ports Figure 5-3.1: Compressor inverter module ports and components Notes: Label descriptions are given in Table 5-3.1.
  • Page 50 VC Pro VRF 50/60Hz Table 5-3.1: Compressor inverter module ports and components Label in Code Content Port voltage Figure 5-3.1 Three phase power input of L1 Rated 220V AC of any two terminals Three phase power input of L2 Rated 220V AC of any two terminals CN11 Three phase power input of L3 Rated 220V AC of any two terminals...
  • Page 51 VC Pro VRF 50/60Hz 3.2 Layout LED indicators LED1 and LED2 Table 5-3.2: LED indicators LED1 and LED2 Indicator LED indicator function and status Inverter module operating indicator. Continuously on if the compressor is running normally and LED 1 flashing if an inverter module error has occurred LED 2 Inverter module error indicator.
  • Page 52 VC Pro VRF 50/60Hz 4 Fan Module 4.1 Ports Figure 5-4.1: Compressor inverter module ports Table 5-4.1: Fan module PCB ports Label in Port code Content Port voltage Connect to fan motor CN1/CN4 Communication port to main board 0-5V DC (varying) Program upgrade port Notes: This dial switch is used to set fan module A/B address.
  • Page 53 VC Pro VRF 50/60Hz 5 Wiring Diagrams 8-16HP Figure 5-5.1: 8-16HP wiring diagram...
  • Page 54 VC Pro VRF 50/60Hz 18-30HP Figure 5-5.2: 18-30HP wiring diagram...
  • Page 55 VC Pro VRF 50/60Hz Part 6 Diagnosis and Troubleshooting 1 Error Code Table ..................56 2 Troubleshooting ..................57 3 Appendix to Part 6 ................. 112...
  • Page 56 VC Pro VRF 50/60Hz 1 Error Code Table Table 6-1.1: Error code table Error Manual re-start Content Remarks code required Only displayed on the slave unit Communication error between outdoor units with the error Phase sequence error Displayed on the unit with the error Communication error between indoor and master unit Only displayed on the master unit Outdoor heat exchanger temperature sensor (T3) error or...
  • Page 57 VC Pro VRF 50/60Hz Table 6-1.1: Error code table (continued) Error Manual re-start Content Remarks code required Inverter module temperature protection Displayed on the unit with the error Compressor discharge insufficient superheat protection Displayed on the unit with the error Inverter module protection Displayed on the unit with the error DC bus low voltage protection...
  • Page 58 VC Pro VRF 50/60Hz 2.2 E0: Communication error between outdoor units Digital display output Description  Communication error between outdoor units.  All units stop running.  Error code is only displayed on the slave unit with the error. Trigger / recover condition ...
  • Page 59 VC Pro VRF 50/60Hz Procedure ODU addresses on switch ENC1 are set Set the ODU addresses correctly incorrectly Ensure the communication wires are Communication wires between ODUs are three-core shielded cable and are not connected properly connected properly Wires between outdoor main PCB and electric control box communication Ensure the wires are connected properly terminals block are loose...
  • Page 60 VC Pro VRF 50/60Hz 2.3 E1: Phase sequence error Digital display output Description  Phase sequence error.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition  Trigger condition: Wrong phase connection for 1.6s or phase missing for 48s. ...
  • Page 61 VC Pro VRF 50/60Hz Procedure The phase sequence of the 3-phase Exchange any two of the 3 phase wires power supply is incrorrect Ensure all supply terminals are securely Some power supply terminals are loose fastened The power supply is abnormal Check the power supply equipment Replace outdoor main PCB Notes:...
  • Page 62 VC Pro VRF 50/60Hz 2.4 E2: Communication error between indoor and master unit Digital display output Description  Communication error between indoor and master unit.  All units stop running.  Error code is only displayed on the master unit. Trigger / recover condition ...
  • Page 63 VC Pro VRF 50/60Hz Procedure Communication wires P Q E have short Reconnect the communication wires circuited or disconnected Communication wires P Q E are not Connect the communication wires in a connected in a daisy chain daisy chain IDU power supply is abnormal Ensure normal power supply Wires between outdoor main PCB and electric control box communication...
  • Page 64 VC Pro VRF 50/60Hz 2.5 E4: Temperature sensor (T3/T4) error Digital display output Description  Outdoor heat exchanger temperature sensor (T3) error or outdoor ambient temperature sensor (T4) error.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition ...
  • Page 65 VC Pro VRF 50/60Hz Procedure Temperature sensor connection on main Ensure the sensor is connected properly PCB is loose Temperature sensor has short-circuited Replace the sensor or failed Replace outdoor main PCB Notes: Outdoor ambient temperature sensor (T4) and heat exchanger temperature sensor (T3) connection is port CN1 on the main PCB (labeled 11 in Figure 5-2.1 in Part 5, 2.1 “Ports”).
  • Page 66 VC Pro VRF 50/60Hz 2.6 E5: Abnormal power supply voltage Digital display output Description  Abnormal power supply voltage.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition ...
  • Page 67 VC Pro VRF 50/60Hz Procedure ODU power supply is abnormal or a Provide normal power supply phase is missing Wires between outdoor main PCB, AC filter boards and electric control box Ensure the wires are connected properly power supply terminals are loose High voltage circuit error has occurred, such as the compressor has malfunctioned...
  • Page 68 VC Pro VRF 50/60Hz 2.7 E7: Temperature sensor (T7C1/2) error Digital display output Description  A compressor top temperature sensor or discharge pipe temperature sensor (T7C1/2) error.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition ...
  • Page 69 VC Pro VRF 50/60Hz Procedure Temperature sensor connection on main Ensure the sensor is connected properly PCB is loose Temperature sensor has short-circuited Replace the sensor or failed Replace outdoor main PCB Notes: Compressor top temperature sensor and discharge pipe temperature sensor connections are ports CN4 and CN5 on the main PCB (labeled 3 and 4, respectively, in Figure 5-2.1 in Part 5, 2.1 “Ports”).
  • Page 70 VC Pro VRF 50/60Hz 2.8 E8: Outdoor unit address error Digital display output Description  Outdoor unit address error.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition ...
  • Page 71 VC Pro VRF 50/60Hz Procedure The ODU's address is not in the valid Slave units addresses should be set from range 1 to 2 Replace the outdoor main PCB Notes: The master unit address should be set as 0, slave units addresses should be set from 1 to 2, and the addresses should not be repeated within one system.
  • Page 72 VC Pro VRF 50/60Hz 2.9 xE9: EEPROM mismatch Digital display output In the error code, 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. Description ...
  • Page 73 VC Pro VRF 50/60Hz Procedure Power off the unit and wait for the digital The outdoor unit was powered on display to turn off before restarting the immediately after being powered off unit Replace outdoor main PCB Notes: When performing a manual restart of an outdoor unit, once the unit has been powered off it should not be powered on again until the digital display has turned off.
  • Page 74 VC Pro VRF 50/60Hz 2.10 xF1: DC bus voltage error Digital display output 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. Description  1F1 indicates compressor A DC bus voltage error; 2F1 indicates compressor B DC bus voltage error. ...
  • Page 75 VC Pro VRF 50/60Hz 2.11 F6: Electronic expansion valve connection error Digital display output Description  Electronic expansion valve connection error.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition ...
  • Page 76 VC Pro VRF 50/60Hz Procedure Electronic expansion valve coil Ensure the sensor is connected properly connection on main PCB is loose Electronic expansion valve coil has Replace the sensor malfunctioned Replace outdoor main PCB Notes: Electronic expansion valve coil connections is port CN70 on the main PCB (labeled 19 in Figure 5-2.1 in Part 5, 2.1 “Ports”). The normal resistances between EXV coil wiring terminals RED and white / yellow / orange / blue are 40-50Ω.
  • Page 77 VC Pro VRF 50/60Hz 2.12 xH0: Communication error Digital display output In the error code, 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. Description ...
  • Page 78 VC Pro VRF 50/60Hz Notes: Compressor inverter module address is set through dial switch S7 on the inverter module. The compressor inverter module A/B location refers to the wiring diagram. S7 on inverter module Inverter module address 0 for compressor inverter module A 1 for compressor inverter module B Communication wire from outdoor main PCB CN26 to inverter module CN8/CN9.
  • Page 79 VC Pro VRF 50/60Hz 2.13 H2, H3: Slave units decreased/increased Digital display output Description  H2 indicates that the number of slave units detected by master unit has decreased.  H3 indicates that the number of slave units detected by master unit has increased. ...
  • Page 80 VC Pro VRF 50/60Hz Procedure H2 / H3 Some outdoor units in the system are Power on all the outdoor units powered off The power supply is abnormal Check the power supply equipment Troubleshoot as for an E0 error Notes: See “E0 Troubleshooting”.
  • Page 81 VC Pro VRF 50/60Hz 2.14 xH4: Inverter module protection Digital display output In the error code, 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. Description ...
  • Page 82 VC Pro VRF 50/60Hz The specific error codes xL0, xL1, xL2 and xL4 can also be obtained from the inverter module LED indicators. If an inverter module error has occurred, LED2 is continuously on and LED1 flashes. Figure: LED indicators LED1 and LED2 on inverter module Table 5-3.2: Errors indicated on LED1 LED1 flashing pattern Corresponding error...
  • Page 83 VC Pro VRF 50/60Hz L0: Inverter module protection L0 protection The compressor wiring is connected Reconnect the cables incorrectly based on wiring diagram The resistance between 3 phases of Disconnect compressor is over 5? the power supply Replace the compressor The insulation resistance of compressor is less than 100k? The inverter module is not well heat...
  • Page 84 VC Pro VRF 50/60Hz L1: DC bus low voltage protection L1 protection Check the power supply The power supply is abnormal equipment No output from bridge rectifier Replace the The DC bus voltage (P, N) is abnormal The reactor performs well reactor Replace the inverter module Note:...
  • Page 85 VC Pro VRF 50/60Hz L2: DC bus high voltage protection L2 protection Check the power supply The power supply is abnormal equipment Replace the 3-phase bridge The DC bus voltage (P, N) is abnormal rectifier Replace the inverter module Note: The normal DC voltage between terminals P and N on inverter module should be 240-375V.
  • Page 86 VC Pro VRF 50/60Hz L4: MCE error L4 protection Remove barriers from heat ODU ventilation is not good exchanger and air outlet of ODU ODU stop valves are closed Open the ODU stop valves Reconnect the cables based on Compressor wiring is not properly Disconnect wiring diagram the power...
  • Page 87 VC Pro VRF 50/60Hz L7: Phase sequence error L7 protection Reconnect cables based on Compressor wiring is loose wiring diagram Disconnect the An open circuit in the 3-phase U/V/W power supply Replace the compressor of compressor terminals Replace the inverter module...
  • Page 88 VC Pro VRF 50/60Hz L8: Compressor frequency variation greater than 15Hz within one second protection L9: Actual compressor frequency differs from target frequency by more than 15Hz protection L8 protection L9 protection ODU stop valves are closed Open the ODU stop valves Reconnect the cables based on Compressor wiring is not properly wiring diagram...
  • Page 89 VC Pro VRF 50/60Hz 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 90 VC Pro VRF 50/60Hz 2.15 H7: Unmatched total number of indoor units Digital display output Description  Number of indoor units detected by master unit not same as number set on main PCB.  All units stop running.  Error code is only displayed on the master unit. Trigger / recover condition ...
  • Page 91 VC Pro VRF 50/60Hz Procedure Number of indoor units set on main PCB Change the setting on the PCB to be the not same as actual number of indoor same as the actual number of indoor units units Some indoor units are powered off Power on all indoor units After re-starting the ODUs and IDUs and Refer to indoor unit troubleshooting...
  • Page 92 VC Pro VRF 50/60Hz 2.16 H8: High pressure sensor error Digital display output Description  High pressure sensor error.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition ...
  • Page 93 VC Pro VRF 50/60Hz Procedure High pressure sensor connection on main Ensure the sensor is connected properly PCB is loose High pressure sensor has short-circuited Replace the sensor or failed Insufficient refrigerant caused by Add refrigerant and inspect system for refrigerant leakage leaks The low pressure side is blocked, caused...
  • Page 94 VC Pro VRF 50/60Hz 2.17 yHd: Slave unit malfunction Digital display output In the error code, 'y' is a placeholder for the address (1 or 2) of the slave unit with the error. Description  1Hd indicates an error on the slave unit with address 1. ...
  • Page 95 VC Pro VRF 50/60Hz Procedure Check relevant slave unit...
  • Page 96 VC Pro VRF 50/60Hz 2.18 P1: Discharge pipe high pressure protection Digital display output Description  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition  Trigger condition: Discharge pressure ≥ 4.3MPa. ...
  • Page 97 VC Pro VRF 50/60Hz … flowchart continued from previous page Discharge part of the refrigerant. Add oil Excess refrigerant if it leaks during discharge Flush all refrigerant then vacuum the System contains air or nitrogen system and recharge the refrigerant. Add oil to the system if it leaks The high pressure side is blocked, caused Inspect the system and fix the error...
  • Page 98 VC Pro VRF 50/60Hz 2.19 P2, H5: Suction pipe low pressure protection Digital display output Description  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition  Trigger condition: For P2 protection: Suction pressure ≤...
  • Page 99 VC Pro VRF 50/60Hz Procedure P2 / H5 ODU stop valves are closed Open the stop valves 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...
  • Page 100 VC Pro VRF 50/60Hz 2.1 xP3: Compressor current protection Digital display output 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. Description  1P3 indicates current protection on compressor A; 2P3 indicates current protection on compressor B. ...
  • Page 101 VC Pro VRF 50/60Hz … flowchart continued from previous page Discharge part of the refrigerant. Add oil Excess refrigerant if it leaks during discharge Flush all refrigerant then vacuum the System contains air or nitrogen system and recharge refrigerant. Add oil to the system if it leaks The condenser heat exchange is poor Inspect the system and fix the error...
  • Page 102 VC Pro VRF 50/60Hz 2.2 P4, H6: Discharge temperature protection Digital display output Description  Discharge temperature protection.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition  Trigger condition: For P4 protection: Discharge temperature (T7C1/2) ≥...
  • Page 103 VC Pro VRF 50/60Hz Insufficient refrigerant caused by Add refrigerant and inspect the system refrigerant leakage for leaks Inspect the system and fix the error. If the The system is blocked, caused by crushed filter is blocked by ice, the piping should or bent pipe, blocked EXV or dirty filter be cleaned Make sure the combination ratio is less...
  • Page 104 VC Pro VRF 50/60Hz 2.3 P5: Outdoor heat exchanger temperature protection Digital display output Description  Outdoor heat exchanger temperature protection.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition ...
  • Page 105 VC Pro VRF 50/60Hz Procedure ODU stop valves are closed Open the stop valves Outdoor heat exchanger temperature Ensure the sensor is connected properly sensor connection on main PCB is loose Outdoor heat exchanger temperature Replace the sensor sensor has short-circuited or failed Make sure the combination ratio is less The indoor load is too large than 130%...
  • Page 106 VC Pro VRF 50/60Hz 2.4 xP9, xH9: Fan module protection Digital display output 'x' is a placeholder for the fan motor system (fan motor and related electrical components), with 1 representing fan motor system A and 2 representing fan motor system B. Description ...
  • Page 107 VC Pro VRF 50/60Hz … flowchart continued from previous page 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 Voltage between P and N on fan module Replace AC filter board is abnormal Replacing the fan module resolves the...
  • Page 108 VC Pro VRF 50/60Hz 2.5 PL, C7: Inverter module temperature protection Digital display output 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. Description ...
  • Page 109 VC Pro VRF 50/60Hz Procedure PL / C7 The inverter module heat sink is blocked Clean or replace the heat sink or dirty The screws connecting the heat sink to Tighten the screws and make sure the the inverter module are loose heat sink is well-connected Inverter module temperature sensor Ensure the sensor is connected properly...
  • Page 110 VC Pro VRF 50/60Hz 2.6 PP: Compressor discharge insufficient superheat protection Digital display output Description  Compressor discharge insufficient superheat protection.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition ...
  • Page 111 VC Pro VRF 50/60Hz Procedure Compressor top temperature sensor and/or discharge pipe temperature Ensure the sensors are connected sensor connections on main PCB are properly loose Compressor top temperature sensor and/or discharge pipe temperature Replace the faulty sensor(s) sensor have short circuited or failed Poor heat insulation of compressor top temperature sensor resulting in Ensure sufficient heat insulation for...
  • Page 112 VC Pro VRF 50/60Hz 3 Appendix to Part 6 3.1 Temperature Sensor Resistance Characteristics Table 6-3.1: Outdoor ambient temperature sensor and outdoor heat exchanger temperature sensor resistance characteristics Temperature Resistance Temperature Resistance Temperature Resistance Temperature Resistance (°C) (kΩ) (°C) (kΩ) (°C) (kΩ) (°C)
  • Page 113 VC Pro VRF 50/60Hz Table 6-3.2: Compressor top temperature sensor and 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...
  • Page 114 VC Pro VRF 50/60Hz Table 6-3.3: Inverter module temperature sensor resistance characteristics Temperature Temperature Temperature Temperature Resistance Resistance Resistance Resistance (kΩ) (kΩ) (kΩ) (kΩ) (°C) (°C) (°C) (°C) 971.4 109.0 19.70 5.000 912.8 103.9 18.97 4.855 858.2 99.02 18.26 4.705 807.3 94.44 17.59...
  • Page 115 VC Pro VRF 50/60Hz 3.2 Normal Operating Parameters of Refrigerant System Under the following conditions, the operating parameters given in Tables 6-3.4 should be observed:  The master outdoor unit can detect all the indoor units.  The number of indoor units displayed on DSP2 is steady and is equal to the actual number of indoor units installed. ...
  • Page 116 Ver. 2019-07 Commercial Air Conditioner Division Midea Group Add.: Midea Headquarters Building, 6 Midea Avenue, Shunde, Foshan, Guangdong, China Postal code: 528311 cac.midea.com / global.midea.com Note: Product specifications change from time to time as product improvements and developments are released and may vary from those in this...

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