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MDV VC MAX Series Service Manual

Commercial air conditioners
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MDVO-VCM224V2R1A
MDVO-VCM280V2R1A
MDVO-VCM335V2R1A
MDVO-VCM400V2R1A
MDVO-VCM450V2R1A
MDVO-VCM500V2R1A
Commercial Air Conditioners
Series VRF
MDVO-VCM560V2R1A
MDVO-VCM615V2R1A
MDVO-VCM670V2R1A
MDVO-VCM730V2R1A
MDVO-VCM785V2R1A
MDVO-VCM850V2R1A
R410A

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  • Page 1 R410A Commercial Air Conditioners Service Manual Series VRF MDVO-VCM560V2R1A MDVO-VCM224V2R1A MDVO-VCM615V2R1A MDVO-VCM280V2R1A MDVO-VCM670V2R1A MDVO-VCM335V2R1A MDVO-VCM730V2R1A MDVO-VCM400V2R1A MDVO-VCM785V2R1A MDVO-VCM450V2R1A MDVO-VCM850V2R1A MDVO-VCM500V2R1A...
  • Page 2 Service Manual...

  • Page 3: Table Of Contents

    VC MAX VRF 50/60Hz CONTENTS Part 1 General Information Part 2 Component Layout and Refrigerant Circuits Part 3 Control Part 4 Field Settings Part 5 Electrical Components and Wiring Diagrams Part 6 Diagnosis and Troubleshooting...
  • Page 4 VC MAX VRF 50/60Hz...

  • Page 5: Part 1 General Information

    VC MAX VRF 50/60Hz Part 1 General Information Indoor and Outdoor Unit Capacities External Appearance Outdoor Unit Combinations Nomenclature Combination Ratio 12 Selection Procedure...

  • Page 6: Indoor And Outdoor Unit Capacities

    VC MAX 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 7: Outdoor Units

    VC MAX VRF 50/60Hz 1.2 Heat recovery ventilator Table 1-1.4: Heat recovery ventilator capacity range Airflow rate 200m 300m 400m 500m 800m 1000m 1500m 2000m 1.3 Outdoor Units Table 1-1.5: Outdoor unit capacity range Capacity Model Name Combination Type MDVO-VCM224V2R1A 10HP MDVO-VCM280V2R1A 12HP...

  • Page 8: External Appearance

    VC MAX VRF 50/60Hz 2 External Appearance 2.1 Indoor Units 2.1.1 Standard indoor units Table 1-2.1: Standard indoor unit appearance One-way Cassette Two-way Cassette Compact Four-way Cassette Four-way Cassette Arc Duct Medium Static Pressure Duct High Static Pressure Duct Floor Standing Wall-mounted Ceiling &...
  • Page 9 VC MAX VRF 50/60Hz 2.3 Outdoor Units 2.3.1 Single units Table 1-2.4: Single outdoor unit appearance 8/10/12/14/16/18/20HP 22/24/26/28/30HP (with single fan) (with dual fans) 2.3.2 Combinations of units Table 1-2.5: Combination outdoor unit appearance 32/34/36/38HP 40/42/44/46/48/50HP 52/54/56/58/60HP 62/64/66/68HP 70/72/74/76/78/80HP 82/84/86/88/90HP...

  • Page 10: Outdoor Unit Combinations

    VC MAX VRF 50/60Hz 3 Outdoor Unit Combinations Table 1-3.1: Outdoor unit combinations System capacity Modules Outdoor No. of units branch joint kit 22.4 ● 28.0 ● 33.5 ● 40.0 ● 45.0 ● 50.0 ● — 56.0 ● 61.5 ● 67.0 ●...

  • Page 11: Nomenclature

    VC MAX VRF 50/60Hz 4 Nomenclature 4.1 Indoor Units 4.1.1 Standard indoor units VC MAX indoor units MDV I 3 - 18 D1 V D ○ ○ ○ ○ ○ ○ ○ Legend Code Remarks VRF indoor unit V8 genera�on with Hyperlink...
  • Page 12 F: Floor Standing Series category (D: DC series) Power supply Omit: 1 phase, 220-240V, 50Hz H: 1 phase, 220-240V, 50/60Hz Refrigerant type (N1: R410A) AC indoor units MDV - D 18 - Q4 / N1 E ○ ○ ○ ○ ○...
  • Page 13 VC MAX VRF 50/60Hz 4.1.2 Fresh air processing unit MDV I3 200 OA V R12 D ○ ○ ○ ○ ○ ○ ○ 1 Legend Code Remarks V8 VRF indoor unit Capacity index (the capacity in kW mul�plied by 10)

  • Page 14: Combination Ratio

    VC MAX VRF 50/60Hz 4.2 Outdoor Units MDV O - VCM 252 V2 R1 A ○ ○ ○ ○ ○ ○ ① Legend Code Remarks Outdoor unit VC MAX VRF Capacity index (the capacity in kW multiplied by 10) Type (V2: All DC inverter)
  • Page 15 VC MAX VRF 50/60Hz Table 1-5.2: Combinations of indoor and outdoor units Outdoor unit capacity Sum of capacity indexes of Sum of capacity indexes of connected indoor Maximum number of Capacity connected indoor units (standard units (fresh air processing units and standard connected indoor index indoor units only)

  • Page 16: Selection Procedure

    VC MAX VRF 50/60Hz 6 Selection Procedure 6.1 Procedure Step 1: Establish design conditions Design temperature and humidity (indoor and outdoor) Required heat load of each room System peak load Piping length, level differences Indoor unit specifications (type and quantity) Step 2: Select indoor units Decide indoor unit safety factor Select indoor unit models ensuring that:...
  • Page 17 VC MAX VRF 50/60Hz 6.2 Example The following is a selection example based on total heat load for cooling. Figure 1-6.1: Room plan Room H Room G Room A Room F Room B Room E Room C Room D Step 1: Establish design conditions ▪...
  • Page 18 VC MAX VRF 50/60Hz Table 1-6.2: Extract from medium static pressure duct (T2) cooling capacity table Indoor air temperature Capacity 14°C WB 16°C WB 18°C WB 19°C WB 20°C WB 22°C WB 24°C WB Model index 20°C DB 23°C DB 26°C DB 27°C DB 28°C DB...
  • Page 19 VC MAX VRF 50/60Hz Table 1-6.5: Extract from Table 1-5.2 Combinations of Indoor and outdoor units Outdoor unit capacity Sum of capacity indexes of Maximum number of connected indoor units (standard connected indoor Capacity index indoor units only) units 50.0 250 to 650 56.0 280 to 728...
  • Page 20 VC MAX VRF 50/60Hz Find the correction factor for piping length and level difference (“K1”) Figure 1-6.3: VC MAX rate of change in cooling capacity Notes: The horizontal axis shows equivalent length of piping between farthest indoor unit and first outdoor branch joint;...

  • Page 21: Part 2 Component Layout And Refrigerant Circuits

    VC MAX VRF 50/60Hz Part 2 Component Layout and Refrigerant Circuits 1 Layout of Functional Components 2 Piping Diagrams 24 3 Refrigerant Flow Diagrams...
  • Page 22 VC MAX VRF 50/60Hz 1 Layout of Functional Components 1.1 8-12HP layout of functional components Figure 2-1.1: 8-12HP layout of functional components Legend Parts name Compressor Oil separator High pressure switch Check value High pressure sensor Microchannel heat exchanger Stop valve(gas side) Electronic expansion valve (EEVA) Stop valve(liquid side) Electronic expansion valve (EEVC)
  • Page 23 VC MAX VRF 50/60Hz 1.2 14-20HP layout of functional components Figure 2-1.2: 14-20HP layout of functional components Legend Parts name Compressor Oil separator High pressure switch Check value High pressure sensor Microchannel heat exchanger Stop valve (liquid side) Electronic expansion valve (EEVA) Charge port Electronic expansion valve (EEVC) Injection bypass solenoid valve(SV5)
  • Page 24 VC MAX VRF 50/60Hz 1.3 22-24HP layout of functional component Figure 2-1.3: 22-24HP layout of functional components Legend Parts name Compressor Oil separator High pressure switch Check value High pressure sensor Microchannel heat exchanger Stop valve (liquid side) Electronic expansion valve (EEVA) Charge port Electronic expansion valve (EEVC) Injection bypass solenoid valve(SV5)
  • Page 25 VC MAX VRF 50/60Hz 1.4 26-30HP layout of functional component Figure 2-1.3: 26-30HP layout of functional components Legend Parts name Compressor Oil separator High pressure switch Check value High pressure sensor Microchannel heat exchanger Stop valve (gas side) Electronic expansion valve (EEVA) Charge port Stop valve (liquid side) Electronic expansion valve (EEVC)

  • Page 26: Piping Diagrams

    VC MAX VRF 50/60Hz 2 Piping Diagrams 2.1 8-12HP piping diagram Figure 2-2.1: 8-12HP piping diagram Legend Parts name Parts name Compressor Low pressure sensor Oil separator Gas-liquid separator High pressure switch Heat exchanger Check value Sensor Code Description High pressure sensor Outdoor air temperature sensor Liquid pipe temperature sensor Microchannel heat exchanger...
  • Page 27 VC MAX VRF 50/60Hz 2.2 14-20HP piping diagram Figure 2-2.2: 14-20HP piping diagram Legend Parts name Parts name Compressor Low pressure sensor Oil separator Gas-liquid separator High pressure switch Muffler Check value Heat exchanger High pressure sensor Sensor Code Description Outdoor air temperature sensor Microchannel heat exchanger Liquid pipe temperature sensor...
  • Page 28 VC MAX VRF 50/60Hz 2.3 22-24HP piping diagram Figure 2-2.3: 22-24HP piping diagram Legend Parts name Parts name Compressor Low pressure sensor Oil separator Gas-liquid separator High pressure switch Muffler Check value Heat exchanger High pressure sensor Sensor Code Description Outdoor air temperature sensor Microchannel heat exchanger Liquid pipe temperature sensor...
  • Page 29 VC MAX VRF 50/60Hz 2.4 26-30HP piping diagram Figure 2-4.4: 26-30HP piping diagram Legend Parts name Parts name Compressor Low pressure sensor Oil separator Gas-liquid separator High pressure switch Muffler Check value Heat exchanger High pressure sensor Liquid bypass valve (SV6) Sensor Code Description Microchannel heat exchanger...

  • Page 30: Key Components

    VC MAX VRF 50/60Hz 2.5 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. Gas-liquid separator: Separates liquid refrigerant from gas refrigerant, stores liquid refrigerant and oil to protect compressor from liquid hammering.

  • Page 31: Refrigerant Flow Diagrams

    VC MAX VRF 50/60Hz Refrigerant Flow Diagrams 3.1 8-12HP 3.1.1 Cooling operation Figure 2-3.1: 8-12HP refrigerant flow during cooling operation 3.1.2 Oil return operation in cooling mode Figure 2-3.3: 8-12HP refrigerant flow during oil return operation in cooling mode...
  • Page 32 VC MAX VRF 50/60Hz 3.2 14-20HP 3.2.1 Cooling operation Figure 2-3.6: 14-20HP refrigerant flow during cooling operation 3.2.2 Oil return operation in cooling mode Figure 2-3.8: 14-20HP refrigerant flow during oil return operation in cooling mode...
  • Page 33 VC MAX VRF 50/60Hz 3.3 22-24HP 3.3.1 Cooling operation Figure 2-3.11: 22-24HP refrigerant flow during cooling operation 3.3.2 Oil return operation in cooling mode Figure 2-3.13: 22-24HP refrigerant flow during oil return operation in cooling mode...
  • Page 34 VC MAX VRF 50/60Hz 3.4 26-30HP 3.4.1 Cooling operation Figure 2-3.11: 26-30HP refrigerant flow during cooling operation 3.4.2 Oil return operation in cooling mode Figure 2-3.13: 26-30HP refrigerant flow during oil return operation in cooling mode...

  • Page 35: Part 3 Control

    VC MAX VRF 50/60Hz Part 3 Control 1 General Control Scheme Flowchart 34 2 Stop Operation 35 3 Startup Control 36 4 Normal Operation Control 5 Protection Control 6 Special Control 47 7 Other Control...
  • Page 36 VC MAX VRF 50/60Hz 1 General Control Scheme Flowchart Sections 2 to 7 on the following pages detail when each of the controls in the flowchart below is activated. Stop operation ▪ Abnormal shutdown ▪ System stops ▪ A unit stops when the load demanded decreases Special control Thermo on Startup control...

  • Page 37: Stop Operation

    VC MAX VRF 50/60Hz 2 Stop Operation The stop operation occurs for one of the three following reasons: Abnormal shutdown: in order to protect the compressors, if an abnormal state occurs, the system will makes a 'stop with thermos-off' operation and an error code will be displayed on the outdoor unit digital displays. The system stops when the set temperature of all indoor unit has been reached, or all indoor units has stop or error.

  • Page 38: Startup Control

    VC MAX VRF 50/60Hz 3 Startup Control 3.1 Startup Sequence and Frequency Control in Combination Modules During the start-up process, the control of the compressor and the heat exchange mode is uniformly judged by the master outdoor unit, and the electronic expansion valve and solenoid valve are self-judged by the salve unit according to its own sensor status.
  • Page 39 VC MAX VRF 50/60Hz 3.3 Startup Control for Cooling Operation Table 3-3.1: Component control during startup in cooling mode Startup control Wiring Before Component startup STEP1 STEP2 STEP3 STEP4 STEP5 diagram label Inverter compressor INV1 Initial step for 30S, Adjust according to the high then+8Hz×Nodu / 10S.

  • Page 40: Normal Operation Control

    VC MAX VRF 50/60Hz 4 Normal Operation Control 4.1 Component Control during Normal Operation Table 3-4.1: Outdoor unit component control during normal operation Wiring Component Cooling diagram label PI control, High pressure protection, Low pressure Inverter compressor A COMP(A) protection, Discharge temperature protection, Inverter Over-current protection control, Inverter module temperature protection control, Wet Inverter compressor B[1]...
  • Page 41 VC MAX VRF 50/60Hz 4.2 Compressor Control Cooling operation Compressor frequency is PI controlled to keep low pressure at target temperature. Te: Low pressure equivalent saturation temperature (°C) Tes: Target Te value. Tes will be decided by Te setting, if you choose Auto that means except Te setting, the Tes would be adjusted according to the ambient temperature, refrigerant pipe length, etc.
  • Page 42 VC MAX VRF 50/60Hz 4.3 Rotation of Compressors In order to make operating time equal for each compressor of combination outdoor units, outdoor units are used in rotation. Figures 3-5.1 to 3-5.2 show the compressor rotation in systems with two and three units. The master unit and slave units 1 and 2 are shown from left to right in that order, and the circled numbers ( ①,②,③,④,⑤,⑥...
  • Page 43 VC MAX VRF 50/60Hz 4.5 Electronic Expansion Valve Control 4.5.1EEVA control The positions of electronic expansion valves EEVA are controlled in steps from 0/0 (fully closed) to 480/2880 (fully open). 4.5.1.1 Outdoor unit heat exchanger is performed via the condenser This function is used to exert PI control on the electronic expansion valve EEVA so that the condenser outlet subcooled degree (SC) will become constant.

  • Page 44: Outdoor Fan Control

    VC MAX VRF 50/60Hz 4.6 Outdoor Fan Control The speed of the outdoor unit fans is adjusted in steps, as shown in Table 3-4.4 Table 3-4.4 Outdoor unit fan step Fan speed (rpm) Note Fan speed index 22-30HP Maximum operation Fan speed 8-20HP FANA / FANB Cooling...
  • Page 45 VC MAX VRF 50/60Hz Table 3-4.5 Upper limit fan step in static pressure mode Static Pressure mode 0Pa(default) 20Pa 40Pa 60Pa 80Pa 100Pa 120Pa...

  • Page 46: High Pressure Protection Control

    VC MAX 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 4.15MPa < 3.5MPa ≥...
  • Page 47 VC MAX VRF 50/60Hz 5.4 Over-current Protection Control Over current protection control is performed to prevent tripping due to transient inverter over-current. It protects the compressors from abnormally high currents. It is performed for each compressor. Figure 3-5.4: Over-current protection control Normal operation Current Current...
  • Page 48 VC MAX VRF 50/60Hz 5.6.2 Error code F63 Figure 3-5.7: Non-inductance resistors temperature protection control Normal operation 95°C Tr <70°C ≥ Non-inductance resistors temperature protection, error code F63 is displayed Notes: Tr: Non-inductance resistors temperature 5.7 Wet Compression Protection Control This protection is used to prevent compressor from damaging for the long time wet compression so that it can’t be lubricated well.
  • Page 49 VC MAX VRF 50/60Hz 6 Special Control 6.1 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 50 VC MAX VRF 50/60Hz 7 Other Control 7.1 Overload control Overload control is used to maintain comfort requirement (i.e. outlet air temperature) and keep proper system pressure. Figure 3-7.1: Overload control Normal operation Indoor unit operation ratio <105% Indoor unit operation ratio 130% ≥...
  • Page 51 VC MAX VRF 50/60Hz Table 3-7.1: Low noise mode (continued) Silent mode 8 Silent mode 9 Silent mode 10 Silent mode 11 Silent mode 12 Silent mode 13 Silent mode 14 Max. Max. Max. Max. Max. Max. Max. Max. Max. Max.

  • Page 52: Part 4 Field Settings

    VC MAX VRF 50/60Hz Part 4 Field Settings Overview Digital display and button settings System Parameter Check 59...
  • Page 53 VC MAX VRF 50/60Hz 1. Overview This chapter describes how the system configuration can be implemented once the installation is completed, and other relevant information. It contains the following information: ● Implement field settings ● Using the Check function Note: The installation personnel should read this chapter. 2.

  • Page 54: Menu Mode

    VC MAX VRF 50/60Hz 2.3 Menu mode Only master unit has the full menu functions, slave 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 55 VC MAX VRF 50/60Hz Menu mode function: Table 4-2.3 Menu mode function: First level menu Second level menu Specified menu mode Description Default Query History error (last ten error codes) (History error) Cleaning history error Query Indoor unit's address (Information (address) Query the address of Indoor unit in power-off condition query)
  • Page 56 VC MAX VRF 50/60Hz Table 4-2.3 Menu mode function(continue) First level menu Second level menu Specified menu mode Description Default Silent mode 8 Silent mode 9 Silent mode 10 Silent mode 11 (Silent mode) Silent mode 12 Silent mode 13 Silent mode 14 √...
  • Page 57 VC MAX VRF 50/60Hz Table 4-2.3 Menu mode function(continue) First level menu Second level menu Specified menu mode Description Default 0m level difference between indoor unit and outdoor unit √ 20m level difference between indoor unit and outdoor unit 40m level difference between indoor unit and outdoor unit 2[1] 60m level difference between indoor unit and outdoor unit (Level difference)
  • Page 58 VC MAX VRF 50/60Hz Table 4-2.3 Menu mode function(continue) First level menu Second level menu Specified menu mode Description Default -3°C 0°C 3°C 6°C √ (target evaporation 7°C temperature of the 8°C indoor unit) 9°C (evaporation 10°C 11°C condensation 41°C temperature) 42°C 43°C...

  • Page 59: Test Running

    VC MAX VRF 50/60Hz 2.4 Special mode introduction 2.4.1 Priority mode setting Priority mode can only be set on the master unit. When an indoor unit is in mode conflict with the outdoor units the unit displays the mode conflict error. The digital display on indoor main PCB will display error code E0. Cooling only mode: The outdoor units only operate in cooling mode.
  • Page 60 VC MAX VRF 50/60Hz 2.4.2.3. System refrigerant quantity detection After entering this mode, the system will automatically run and finally output the diagnostic results of the system refrigerant quantity. Diagnostic results: Normal: Digital display “d34” Significantly excessive: Digital display “d32” Excessive: Digital display “d33”...
  • Page 61 VC MAX VRF 50/60Hz 3. System Parameter Check 3.1 UP / DOWN system check button Before pressing UP or DOWN button, allow the system to operate steadily for more than an hour. On pressing UP or DOWN button, the parameters listed in below table will be displayed in sequence. Table 4-3.1 system check list: DSP1 content Parameters displayed on DSP2...
  • Page 62 VC MAX VRF 50/60Hz Table 4-3.1 system check list(continue): DSP1 content Parameters displayed on DSP2 Remarks 27.-- Discharge superheat degree (°C) Actual value = value displayed 28.-- Primary current(A) Actual value = value displayed /10 29.-- Inverter compressor A current (A) Actual value = value displayed /10 30.-- Inverter compressor A current (A)
  • Page 63 VC MAX VRF 50/60Hz Table 4-3.1 system check list(continue): DSP1 content Parameters displayed on DSP2 Remarks 50.-- Reserved Actual value = value displayed 【0】:No result 【1】:Significantly insufficient 【2】:insufficient 51.-- Refrigerant volume judgment 【3】:Normal 【4】:excessive 【5】:Significantly excessive 52.-- Dirty blockage rate (outdoor heat exchanger) 0~10, 10 represents the worst 53.-- Fan historical error...

  • Page 64: Part 5 Electrical Components And Wiring Diagrams

    VC MAX VRF 50/60Hz Part 5 Electrical Components and Wiring Diagrams Outdoor Unit Electric Control Box Layout Outdoor Unit Main Control Board Compressor & Fan drive board 69 Wiring Diagrams...
  • Page 65 VC MAX VRF 50/60Hz 1. Outdoor Unit Electric Control Box Layout 1.1 8-18HP electric control box Figure 5-1.1: 8-18HP electric control box 1.2 20HP electric control box Figure 5-1.2: 20HP electric control box Notes: The differences between electric control box of 20HP and 8-18HP are shown in the Figure 5-1.2. Others are the same as 8-18HP electric control box.
  • Page 66 VC MAX VRF 50/60Hz 1.3 22-24HP electric control box Figure 5-1.3: 22-24HP electric control box Notes: The differences between electric control box of 22-24HP and 8-18HP are shown in the Figure 5-1.3. Others are the same as 8-18HP electric control box. 1.4 26-36HP electric control box Figure 5-1.4: 26-30HP electric control box Notes:...
  • Page 67 VC MAX VRF 50/60Hz Outdoor Unit Main Control Board 2.1 Outdoor unit main Control Board ports Figure 5-2.1: Outdoor unit main Control Board ports Notes: Label descriptions are given in Table 5-2.1: Main Control Board port...
  • Page 68 VC MAX VRF 50/60Hz Table 5-2.1: Main Control Board port Label in Figure Port code Content Port voltage 5-2.1 CN82 Reserved 5Vdc CN36 Recirculation fan control port 3.3Vdc CN70 EEVA drive port 12Vdc CN71 EEVB drive port(Reserved) 12Vdc CN72 EEVC drive port 12Vdc CN73 EEVE drive port...
  • Page 69 VC MAX VRF 50/60Hz 2.2 Outdoor unit main Control Board components 2.2.1 Layout Figure 5-2.2: Outdoor unit main Control Board components 2.2.2 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 SW3 (UP) menu modes.
  • Page 70 VC MAX VRF 50/60Hz 2.2.3 Digital display output Table 5-2.4: Digital display output in different operating states Outdoor unit state Parameters displayed on DSP1 Parameters displayed on DSP2 The number of indoor units in DSP1 Standby The address of outdoor unit communication with the outdoor units For single...
  • Page 71 VC MAX VRF 50/60Hz Compressor & Fan drive board 3.1 Corresponding table of Compressor & Fan drive board and outdoor units Table 5-3.1: Corresponding table of Compressor & Fan drive board and outdoor units Compressor & Fan drive board model Outdoor unit series Model VC MAX...
  • Page 72 VC MAX VRF 50/60Hz 3.3 Compressor & Fan drive board of 50A Figure 5-3.2: Compressor & Fan drive board of 50A...
  • Page 73 VC MAX VRF 50/60Hz 3.4 Compressor & Fan drive board of 35A Figure 5-3.3: Compressor & Fan drive board of 35A...
  • Page 74 VC MAX VRF 50/60Hz 3.5 Compressor & Fan drive board ports Figure 5-3.4: Compressor & Fan drive board ports Table 5-3.2: Compressor & Fan drive board port Label in Port Feature Content Port voltage Figure 5-2.5 code identifier Positive pole Input terminal of the high voltage capacitors P-in 438Vdc-650Vdc(Rated at 540Vdc) (connected to reactor)
  • Page 75 VC MAX VRF 50/60Hz Table 5-3.2: Compressor & Fan drive board port (continued) Label in Port Feature Content Port voltage Figure 5-2.5 code identifier DCFAN Three phase output of the inverter ,connected to the DC fan 0~100%*input voltage(varying) Ports from top to bottom are defined CN8/C Communication port between main control board and O-Motor...
  • Page 76 VC MAX VRF 50/60Hz 3.6 The installation guide of Compressor & Fan drive board Figure 5-3.5: The installation guide of Compressor & Fan drive board 1. Before maintaining or repairing the outdoor unit, cut off the power supply of the outdoor unit for 5 minutes and use a mustimeter to ensure that the voltage is zero to avoid electric shock.
  • Page 77 VC MAX VRF 50/60Hz 4. Wiring Diagrams Figure 5-3.1: Outdoor unit wiring diagram...
  • Page 78 VC MAX VRF 50/60Hz Legend Code Name Code Name COMP A/ COMP B Compressor Terminal block EEVA / EEVC / EEVE Electronic expansion valve Outdoor ambient temperature sensor FAN A/ FAN B DC Fan Liquid pipe temperature sensor DC FAN A/DC FAN B Recirculation Fan Microchannel heat exchanger inlet pipe temperature sensor HEAT A/ HEAT B...

  • Page 79: Part 6 Diagnosis And Troubleshooting

    VC MAX VRF 50Hz/60Hz Part 6 Diagnosis and Troubleshooting 1 Error Code Table 78 2 Error in Main Control 83 3 Error in Compressor Driver 4 Error in Fan Drive 5 Appendix 174...

  • Page 80: Error Code Table

    VC MAX VRF 50/60Hz 1 Error Code Table 1.1 Outdoor Error code table Table 6-1.1 Outdoor Error code table Manual re-start Error code Error description Remarks required Emergency shutdown Outdoor unit’s fault No.x Inverter driver board does not match the main control board Outdoor unit’s fault xA61 No.x slave unit error...
  • Page 81 VC MAX VRF 50Hz/60Hz Table 6-1.1 Outdoor Error code table (continued) Manual re-start Error code Error description Remarks required Gas pipe temperature sensor (Tg) error (open/short) sensor error Liquid pipe temperature sensor (T5) error (open/short) sensor error Outdoor Heat exchanger gas temperature sensor (T8) error (open/short) sensor error Outdoor heat exchanger liquid temperature sensor (TL) error (open/short) sensor error...
  • Page 82 VC MAX VRF 50/60Hz 1.2 Installation and debugging error code table Table 6-1.2 Installation and debugging error code table Manual re- Error code Error description Remarks start required Outdoor unit model is not set System configuration Outdoor unit Capacity setting error System configuration System contains the old Indoor Unit with old platforms System configuration...
  • Page 83 VC MAX VRF 50Hz/60Hz Table 6-1.3 Compressor drive error code table (continued) Manual re-start Error code Error description Remarks required xL47 Module type mismatch Module error xL4E EEPROM error E party error xL5E Startup failed Control error xL51 Out-of-step error Control error xL52 Locked-rotor protection...
  • Page 84 VC MAX VRF 50/60Hz Table 6-1.5 Status prompt code table (continued) Manual re-start Status code Code description Remarks required2 The outdoor ambient temperature exceeds the lower limit Status hint (Cooling mode) Refrigerant judgment: no result Status hint Refrigerant quantity judgment:Significantly excessive Status hint Refrigerant quantity judgment:Slightly excessive Status hint...
  • Page 85 VC MAX VRF 50Hz/60Hz 2 Error in Main Control 2.1 A01: Emergency shutdown of Outdoor Units Digital display output Description ▪ Compressor protection shut down ▪ All Outdoor Units stop running ▪ Error codes are displayed only on master uint. Trigger / recover condition Scenario 1: ODU menu item n28 is set to 0: ▪...
  • Page 86 VC MAX VRF 50/60Hz Procedure One or both of the following If nC0 3, ignore port Input1 in the following troubleshooting are true: nC0 = 3 or nC1 = 3 If nC1 3, ignore port Input2 in the following troubleshooting Menu set item n28 = 0 未与消防开关相连...
  • Page 87 VC MAX VRF 50Hz/60Hz 2.2 xA61: No.x slave unit error Digital display output Description ▪ xA61 shows a slave unit error with the ODU address of x (x = 1,2,3). ▪ All Outdoor Units stop running ▪ Error code are displayed only on master unit. Trigger / recover condition ▪...
  • Page 88 VC MAX VRF 50/60Hz 2.3 AAx: Inverter driver board X does not match the main control board Digital display output Description ▪ No.x Inverter driver board does not match the main control board ▪ All units stop running. ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪...
  • Page 89 VC MAX VRF 50Hz/60Hz 2.4 xb53: No.x Recirculation fan error Digital display output Description ▪ No.x Recirculation Fan[1] is in error ▪ Unit with the error stop running. ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪...
  • Page 90 VC MAX VRF 50/60Hz 2.5 bA1: HyperLink cannot open or close IDU’s Electronic expansion valve Digital display output Description ▪ When some IDUs are powered off, HyperLink fail to close their EEV. ▪ All units stop running. ▪ Error code is only displayed on the master unit ▪...
  • Page 91 VC MAX VRF 50Hz/60Hz Digital display output Description ▪ All units stop running ▪ Error code is displayed on the unit with the error. Trigger / recover condition Trigger condition: The main control board has not detected signals from the EEV for 2 minutes. Recover condition: The main control board detects a signal from the EEV.
  • Page 92 VC MAX VRF 50/60Hz Digital display output Description ▪ The address of Outdoor Unit is repeated. ▪ Error code is displayed on the master outdoor unit. Trigger /recover condition ▪ Trigger:Two or more outdoor units in the combined system have the same address ▪...
  • Page 93 VC MAX VRF 50Hz/60Hz 2.8 C21: Communication error between IDU and ODU. Digital display output Description ▪ Communication error between IDU and ODU ▪ All units stop running. ▪ Error code is only displayed on the master unit. Trigger / recover condition ▪...
  • Page 94 VC MAX VRF 50/60Hz 2. Faults caused by other factors (1) All indoor units are not set address; (2) All indoor units are not powered on; (3) The communication wiring between the master unit and the first IDU is not reliably connected: ▪...
  • Page 95 VC MAX VRF 50Hz/60Hz 2.9 C26 Abnormal reduction in the number of indoor units Digital display output Description ▪ The number of online indoor units is smaller than the configured number ▪ All units stop running. ▪ Error code is only displayed on the master unit Trigger / recover condition ▪...
  • Page 96 VC MAX VRF 50/60Hz Procedure Select one of the following solutions Is the IDU address Solution 1: Reset the address. In menu n44, set to [0] code not set or (automatic addressing)[1]. duplicated. Solution 2: Manually set the address of IDUs. After setting, ensure that the IDU addresses are not duplicated.
  • Page 97 VC MAX VRF 50Hz/60Hz 2.10 C28: Abnormal increase in the number of indoor units Digital display output Description ▪ The number of online indoor units is greater than the configured number ▪ All units stop running. ▪ Error code is only displayed on the master unit Trigger / recover condition ▪...
  • Page 98 VC MAX VRF 50/60Hz 2.11 xC31: Communication error between No.x slave outdoor unit and master outduoor unit. Digital display output Description ▪ The No.x outdoor slave unit cannot communicate with the outdoor master unit. ▪ Outdoor units that display the error code stop running. ▪...
  • Page 99 VC MAX VRF 50Hz/60Hz 2.12 C32: Abnormal reduction in the number of outdoor units Digital display output Description ▪ The number of online slave outdoor units detected by the master outdoor unit decreases ▪ All units stop running. ▪ Error code is only displayed on the master unit Trigger / recover condition ▪...
  • Page 100 VC MAX VRF 50/60Hz 2.13 C33: Abnormal increase in the number of outdoor units Digital display output Description ▪ The number of online outdoor slave units detected by the outdoor master unit increases ▪ All units stop running. ▪ Error code is only displayed on the master unit Trigger / recover condition ▪...
  • Page 101 VC MAX VRF 50Hz/60Hz 2.14 xC41: Communication Error between main control board and No.x inverter driver board Digital display output Description ▪ The communication between the main control board and No.x inverter driver board is error ▪ All units stop running. ▪...
  • Page 102 VC MAX VRF 50/60Hz Procedure Measure the ODU main power Eliminate the problems with L1/L2/L3. Is there phase loss or voltage the power supply accordingly failure? Measure the input voltage Is there circuit break, L1/L2/L3 after module rectification. Change the connecting misphase, or poor contact with the Is there phase loss or power supply cable...
  • Page 103 VC MAX VRF 50Hz/60Hz 2.15 E41,F31,F51,xF71,F81,F91,FC1,xFd1,Fp1: Temperature sensor error Digital display output Error code Error description Remarks Digital display output Outdoor ambient temperature sensor sensor error (T4) error(open/short) Gas pipe temperature sensor (Tg) error sensor error (open/short) Outdoor heat exchanger liquid temperature sensor (TL) error sensor error (open/short)
  • Page 104 VC MAX VRF 50/60Hz ▪ The temperature sensor is not properly connected to the main control board. ▪ The sensor is short-circuited or fails. ▪ The main control board is damaged Procedure 1. E41/F81/FC1/FP1 E41/F81/FC1/FP1 Temperature sensor Correctly connect connection on main board is temperature sensor loose[1] Temperature...
  • Page 105 VC MAX VRF 50Hz/60Hz 3. xF71 1F71, 2F71 T7C sensors are not Connect T7C sensors correctly connected to the compressor top or to the compressor top and fix T7C1 and T7C2 are connected reversely them with spring clips. to the compressor T7C sensor is Correctly connect not connected or is in...
  • Page 106 VC MAX VRF 50/60Hz 2.16 F63: Non-inductive resistance Tr overtemperature protection Digital display output Description ▪ The temperature of the Tr non-inductive resistance NTC is too high. ▪ All units stop running ▪ Error code is displayed on the outdoor unit with the Error Trigger/ Recover condition ▪...
  • Page 107 VC MAX VRF 50Hz/60Hz 2.17 F72, F7A: Discharge Temperature protection Digital display output Description ▪ Discharge Temperature is over the limit. ▪ All outdoor Unit stop running ▪ Error code is displayed on the unit with the error Trigger / Recover condition ▪...
  • Page 108 VC MAX VRF 50/60Hz Procdure F72/F7A Open the ODU check Is the ODU check valve closed? valve and power on. Does the error display again? Correctly connect the Is the piping and wiring piping and wiring, then power on. connected correctly? Does the error display again? Is the temperature of the discharge temperature...
  • Page 109 VC MAX VRF 50Hz/60Hz 2.18 F75: Compressor discharge insufficient superheat protection Digital display output Description ▪ Superheat degree of compressor discharge temperature is too low, triggering protection shutdown ▪ Determination during operation of outdoor unit. ▪ All units stop running. ▪...
  • Page 110 VC MAX VRF 50/60Hz Procedure Correctly connect the Is the piping and wiring piping and wiring, then power on. Does connected correctly? the error display again? Figure I Do any of the following conditions occur? 1. T7C sensors are not Correctly connect T7C sensors to the connected to the compressor top compressor top and fix them with spring...
  • Page 111 VC MAX VRF 50Hz/60Hz 2.19 P11: High pressure sensor error Digital display output Description ▪ Open/short circuit error of high pressure sensor ▪ All units stop running. ▪ The error code is displayed on the Outdoor Unit with error. Trigger / recover condition ▪...
  • Page 112 VC MAX VRF 50/60Hz 2.20 P12/P14: High pressure protection Digital display output Description ▪ P12: The high pressure is over the limit. ▪ P14: 3 times P12 in 100 minutes ▪ All units stop running ▪ Error code is displayed on the unit with the Error Trigger / recover condition ▪...
  • Page 113 VC MAX VRF 50Hz/60Hz Procedure Enter the MENU vacuum Is the high pressure mode (n15) after power off. Wait for value measured for the main board Replace the main 1min. Are the HP and LP pressures normal after the pressure sensor board close, and troubleshooting? is unplugged? [1]...
  • Page 114 VC MAX VRF 50/60Hz 2.21 P13: High pressure switch protection Digital display output Description ▪ All units stop running ▪ Error code is displayed on the unit with the Error Trigger / recover condition ▪ Trigger condition: discharge pressure≥ 4.1MPa or the switch is open-circuited. ▪...
  • Page 115 VC MAX VRF 50Hz/60Hz 2.22 P21: Low pressure sensor error Digital display output Description ▪ Open/short circuit Error in suction pressure sensor ▪ All units stop running. ▪ Error code is only displayed on the unit with the error. Trigger / recover condition ＜0.02MPa or P ＞2.1MPa (including sensor open circuit).
  • Page 116 VC MAX VRF 50/60Hz 2.23 P22/P25: Low pressure protection Digital display output Description ▪ P22: Low pressure protection; ▪ P25: Low pressure protection occurs 3 times in 60 min. ▪ All units stop running. ▪ Error code is displayed on the unit with the error. Trigger/ Recover condition ▪...
  • Page 117 VC MAX VRF 50Hz/60Hz Procedure P22/P25 Enter the MENU vacuum Is the low pressure mode (n15) after power off. Wait for value measured for the main board Replace the main 1min. Are the HP and LP pressures normal after the pressure sensor board close, and troubleshooting? is unplugged? [1]...
  • Page 118 VC MAX VRF 50/60Hz 2.24 P24: Low Pressure too High Protection Digital display output Description ▪ All units stop running. ▪ ODU fault is determined based on the sensor. ▪ Error code is displayed on the unit with the error Trigger/ Recover condition ▪...
  • Page 119 VC MAX VRF 50Hz/60Hz Procedure Is the pressure of the detection The main board is valve during s teady Is the main board pressure normal? [3] damaged. Rep lace it operation 1.6 MPa? [1] Measure the pressure and voltage of the pressure sensor. Contact the after-sales There may be 3 co nditio ns for the sys tem: Do they satisfy sensor ch aracteristics?
  • Page 120 VC MAX VRF 50/60Hz 2.25 P31: Primary Side Overcurrent Protection Digital display output Description ▪ The AC current at the device primary side is too high, which triggers protective shutdown. The current is transmitted by the module to the main control board. ▪...
  • Page 121 VC MAX VRF 50Hz/60Hz 2.26 xP32, xP33: No.(x) compressor high DC bus current protection Digital display output Description ▪ The DC bus current of No.x compressor is too high, triggering protection shutdown ▪ All units stop running. ▪ Error code is displayed on the unit with the error. Trigger / recover condition ▪...
  • Page 122 VC MAX VRF 50/60Hz Procedure XP32，XP33 Open ODU stop ODU stop valve is closed? valve compressor cable is Replacing the damaged compressor Cable The resistance of The compressor is the compressor wiring damaged. Replace terminals to the ground is the compressor less than 1 MΩ...
  • Page 123 VC MAX VRF 50Hz/60Hz 2.27 P51: High AC voltage protection Digital display output Description ▪ The AC voltage of the system is too high, triggering the protection shutdown ▪ All units stop running ▪ Error code is displayed on the unit with the error. Trigger / recover condition ▪...
  • Page 124 VC MAX VRF 50/60Hz 2.28 P52: Low voltage protection Digital display output Description ▪ The AC voltage of the system is too low, triggering the protection shutdown ▪ All units stop running. ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪...
  • Page 125 VC MAX VRF 50Hz/60Hz 2.29 P53: Phase B and N of the power cable are connected to the opposite protection Digital display output Description ▪ System phase and neutral wires are connected reversely and fail the inspection ▪ All units stop running ▪...
  • Page 126 VC MAX VRF 50/60Hz 2.30 P54: DC bus low voltage protection Digital display output Description ▪ The DC bus voltage of the compressor is too low ▪ All units stop running. ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪...
  • Page 127 VC MAX VRF 50Hz/60Hz 2.31 P55: DC bus ripple over protection Digital display output Description ▪ The ripple of the DC bus on the module is over the limits. ▪ All units stop running. ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪...
  • Page 128 VC MAX VRF 50/60Hz 2.32 xP56: No.x inverter driver board DC bus voltage is too low Digital display output Description ▪ No.x inverter driver board DC bus voltage is too low ▪ All units stop running. ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪...
  • Page 129 VC MAX VRF 50Hz/60Hz 2.33 xP57: No.x inverter driver board DC bus voltage is too high Digital display output Description ▪ No.x inverter driver board DC bus voltage is too high ▪ All units stop running. ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪...
  • Page 130 VC MAX VRF 50/60Hz 2.34 xP58: No.x inverter driver board DC bus voltage is seriously too high Digital display output Description ▪ No.x inverter driver board DC bus voltage is seriously too high ▪ All units stop running ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪...
  • Page 131 VC MAX VRF 50Hz/60Hz 2.35 xP5A: Phase B Misphase of Inverter Module P5A Input Power Supply Digital display output Description ▪ The phase and neutral wires are connected reversely and fail the inspection. ▪ All units stop running ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪...
  • Page 132 VC MAX VRF 50/60Hz 2.36 P71: Error in EEPROM Digital display output Description ▪ The EEPROM parameter of the ODU main control board is incorrect ▪ All units stop running. ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪...
  • Page 133 VC MAX VRF 50Hz/60Hz 2.37 Pb1: HyperLink overcurrent error Digital display output Description ▪ HyperLink overcurrent error ▪ All units stop running. ▪ Error code is displayed on master ODU. Trigger / recover condition ▪ Trigger condition: The M1M2 communication wiring is short-circuited, or M1M2 is connected to the 485 communication port by mistake ▪...
  • Page 134 VC MAX VRF 50/60Hz 2.38 Pd1, Pd2: Anti-condensation protection Digital display output Description ▪ Anti-condensation protection ▪ All units stop running. ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪ Trigger condition: Pd1: Liquid pipe inlet temperature (T5) remains lower than the anti-condensation setting temperature for more than 10 min Pd2: Pd1 protection occurs 2 times in 60 minutes ▪...
  • Page 135 VC MAX VRF 50Hz/60Hz Procedure Pd1/Pd2 Check the following aspects first: 1. EEVC terminal is correctly connected to the main board and the EEVC is correctly Connect the EEVC or sensor connected to the coil [1] according to the correct connection 2.
  • Page 136 VC MAX VRF 50/60Hz 2.39 U11: Outdoor unit model is not set Digital display output Description ▪ The outdoor unit model is not set into the main board. ▪ All units stop running ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪...
  • Page 137 VC MAX VRF 50Hz/60Hz 2.40 U12: Outdoor unit Capacity setting error Digital display output Description ▪ The capability information of outdoor unit is not set ▪ All units stop running ▪ Error code is displayed on the unit with the Error Trigger / recover condition ▪...
  • Page 138 VC MAX VRF 50/60Hz 2.41 U21: The indoor unit connection is incorrect Digital display output Description ▪ Connected to the 1 generation indoor unit or indoor unit address repeated in system ▪ All Outdoor units stop running ▪ Error code is displayed on the master unit Trigger / recover condition ▪...
  • Page 139 VC MAX VRF 50Hz/60Hz 2.42 U31: The test run was never successful Digital display output Description ▪ The system is not in the test run or the test run is unsuccessful ▪ All units stop running ▪ Error code is only displayed on the master unit. Trigger / Recover condition ▪...
  • Page 140 VC MAX VRF 50/60Hz 2.43 U32, U33, U34: The temperature is not suitable for test run Digital display output Description ▪ During the test run, the indoor or outdoor temperature exceeds the operating range ▪ All units stop running ▪ Error code is only displayed on outdoor unit Trigger /Recover condition ▪...
  • Page 141 VC MAX VRF 50Hz/60Hz 2.44 U35, U37: Stop valve is not open Digital display output Description ▪ The outdoor unit stop valve is not opened during the test run. ▪ All units stop running ▪ Error code is only displayed on the master unit. Trigger/ Recover condition ▪...
  • Page 142 VC MAX VRF 50/60Hz 2.45 U38: Outdoor Unit has no address. Digital display output Description ▪ Outdoor Unit has no address. ▪ Outdoor Unit with error can not run. ▪ Outdoor Unit with error cannot communicate with indoor units. Trigger / recover condition ▪...
  • Page 143 VC MAX VRF 50Hz/60Hz 2.46 U3A: The communication wiring is connected incorrectly Digital display output Description ▪ Indoor unit piping and communication wiring are not connected in the same system. ▪ All units stop running ▪ Error code only displayed on the master unit. Trigger / Recover condition ▪...
  • Page 144 VC MAX VRF 50/60Hz 2.47 U3b: The installation environment is abnormal Digital display output Description ▪ Ambient temperature of the test environment exceeds the allowed range during the test run ▪ All units stop running ▪ Error code only displayed on the master unit. Trigger / Recover condition ▪...
  • Page 145 VC MAX VRF 50Hz/60Hz 2.48 U3C: Changeover mode error Digital display output Description ▪ ODU in changeover mode doesn’t set the VIP IDU address. ▪ ODUs stop running ▪ Error code only displayed on the master unit. Trigger / Recover condition ▪...
  • Page 146 VC MAX VRF 50/60Hz 2.49 U4x: Overconnection ratio Digital display output Description ▪ Combination ratio of indoor unit and outdoor unit is out of range ▪ All units stop running ▪ Error code only displayed on the master unit Trigger / Recover condition ▪...
  • Page 147 VC MAX VRF 50Hz/60Hz ▪ Reset method: Resume manually Possible causes ▪ Indoor units and outdoor units combination ratio is out of range. ▪ Outdoor unit address is repeated or the slave outdoor unit does not have an address. ▪ Individual series indoor unit is installed in combination with a combinable series. Procedure Check the indoor unit connection and remove the indoor unit beyond the...
  • Page 148 VC MAX VRF 50/60Hz 2.50 U51: More than One Outdoor Unit Models in the Individual Series System Digital display output Description ▪ Outdoor unit of Individual Series is installed in combine system, and the number of ODUs detected is greater than 1. ▪...
  • Page 149 VC MAX VRF 50Hz/60Hz 2.51 U53: Two or More Outdoor Unit Models in the Combined System Digital display output Description ▪ Detected different series outdoor units in the combined system ▪ All units stop running ▪ Error code is only displayed master unit Trigger / Recover condition ▪...
  • Page 150 VC MAX VRF 50/60Hz 3 Error in Compressor Driver 3.1 xL1E: Hardware overcurrent Digital display output Description ▪ The compressor current exceeds the protection value set for the hardware. ▪ The compressor stops running after the error occurs. If the error disappears one minute later, the compressor starts again Trigger / recover condition ▪...
  • Page 151 VC MAX VRF 50Hz/60Hz 3.2 xL11, xL12 : Software overcurrent Digital display output Description ▪ The compressor current exceeds the protection value set by the software. ▪ The compressor will shutdowm when the error occurs. If the error disappears one minute later, the compressor will start again.
  • Page 152 VC MAX VRF 50/60Hz 3.3 xL2E: Module overtemperature protection Digital display output Description ▪ The temperature of the compressor or fan drive board (IPM) exceeds the set value (100°C). ▪ The compressor will stop when the error occurs. If the error disappears one minute later, the compressor will start again Trigger / recover condition ▪...
  • Page 153 VC MAX VRF 50Hz/60Hz 3.4 xL3E: The bus voltage is too low Digital display output Description ▪ The DC bus voltage of the drive board is lower than 350VDC. ▪ The compressor stops running after the error occurs. If the error disappears one minute later, the compressor starts again.
  • Page 154 VC MAX VRF 50/60Hz 3.5 xL31: The bus voltage is too high Digital display output Description ▪ Bus voltage is higher than the high bus voltage protection threshold set by the software (800VDC). ▪ The compressor stops running after the error occurs. If the error disappears one minute later, the compressor starts again.
  • Page 155 VC MAX VRF 50Hz/60Hz 3.6 xL32: The bus voltage is excessively high Digital display output Description ▪ Bus voltage is higher than the high bus voltage protection threshold set by the software (820VDC). ▪ The compressor stops running after the error occurs. If the error disappears one minute later, the compressor starts again.
  • Page 156 VC MAX VRF 50/60Hz 3.7 xL43: The current sampling bias is abnormal. Digital display output Description ▪ The drive board is faulty upon the power-on self test. ▪ Once this fault occurs, the compressor cannot be started up, and the drive board must be checked. Trigger / recover condition ▪...
  • Page 157 VC MAX VRF 50Hz/60Hz 3.8 XL45: Motor Code Mismatch Digital display output Description ▪ The compressor parameters set by the main control board do not match the compressor parameters of the drive board. ▪ Once this fault occurs, the compressor cannot be started up, and the drive board must be checked. Trigger / recover condition ▪...
  • Page 158 VC MAX VRF 50/60Hz 3.9 XL46: Motor Code Mismatch Digital display output Description ▪ IPM has overcurrent or IPM has drive undervoltage. ▪ The compressor stops running after the error occurs. If the error disappears one minute later, the compressor starts again.
  • Page 159 VC MAX VRF 50Hz/60Hz 3.10 XL47: Motor Code Mismatch Digital display output Description ▪ The compressor parameters set by the main control board do not match the compressor parameters, the driver board specifications set by the main control board do not match the compressor specifications of the drive board. Trigger / recover condition ▪...
  • Page 160 VC MAX VRF 50/60Hz 3.11 xL5E: Startup failed Digital display output Description ▪ The compressor fails to start ▪ The compressor stops running after the error occurs. If the error disappears one minute later, the compressor starts again. Trigger / recover condition ▪...
  • Page 161 VC MAX VRF 50Hz/60Hz 3.12 xL52: Locked-rotor protection Digital display output Description ▪ The compressor is blocked. ▪ The compressor stops running after the error occurs. If the error disappears one minute later, the compressor starts again. Trigger / recover condition ▪...
  • Page 162 VC MAX VRF 50/60Hz 3.13 xL6E: Compressor motor lack of phase protection Digital display output Description ▪ Compressor motor lack of phase protection. ▪ The compressor stops running after the error occurs. If the error disappears one minute later, the compressor starts again.
  • Page 163 VC MAX VRF 50Hz/60Hz 4 Error in Fan Drive 4.1 xJ1E: Hardware overcurrent Digital display output Description ▪ The fan current exceeds the protection value set for the hardware. ▪ The fan stops running after the error occurs. If the error disappears five seconds, the fan starts again Trigger / recover condition ▪...
  • Page 164 VC MAX VRF 50/60Hz 4.2 xJ11, xJ12: Software overcurrent Digital display output Description ▪ The fan current exceeds the protection value set for the software. ▪ The fan will stop when the error occurs. If the error disappears five seconds later, the fan will start again. Trigger / recover condition ▪...
  • Page 165 VC MAX VRF 50Hz/60Hz 4.3 xJ2E: Module overtemperature protection Digital display output Description ▪ The internal temperature of the fan drive module (IPM) is higher than 100 ℃ Trigger / recover condition ▪ Trigger condition:The temperature of the IPM exceeds 100 ℃...
  • Page 166 VC MAX VRF 50/60Hz 4.4 xJ3E: The bus voltage is too low Digital display output Description ▪ Bus voltage is lower than the low bus voltage protection threshold set by the software (350VDC). ▪ The fan stops running after the error occurs. If the error disappears five seconds later, the fan starts again. Trigger / recover condition ▪...
  • Page 167 VC MAX VRF 50Hz/60Hz 4.5 xJ31: The bus voltage is too high Digital display output Description ▪ Bus voltage is higher than the high bus voltage protection threshold set by the software (750VDC). ▪ The fan stops running after the error occurs. If the error disappears five seconds later, the fan starts again. Trigger / recover condition ▪...
  • Page 168 VC MAX VRF 50/60Hz 4.6 xJ32: The bus voltage is excessively high Digital display output Description ▪ Bus voltage is higher than the high bus voltage protection threshold set by the software (770VDC). ▪ The fan stops running after the error occurs. If the error disappears five seconds later, the fan starts again. Trigger / recover condition ▪...
  • Page 169 VC MAX VRF 50Hz/60Hz 4.7 xJ43: The current sampling bias is abnormal Digital display output Description ▪ The detection circuit of the drive board fails the power-on self test. ▪ After this error occurs, the fan cannot start. Check whether the inverter driver board is in error. Trigger / recover condition ▪...
  • Page 170 VC MAX VRF 50/60Hz 4.8 Motor Code Mismatch Digital display output Description ▪ The compressor parameters set by the main control board do not match the compressor parameters of the drive board. ▪ Once this fault occurs, the fan cannot be started up, and the drive board must be checked. Trigger / recover condition ▪...
  • Page 171 VC MAX VRF 50Hz/60Hz 4.9 XL47: Motor Code Mismatch Digital display output Description ▪ The fan parameters set by the main control board do not match the fan parameters, the driver board specifications set by the main control board do not match the fan specifications of the drive board. Trigger / recover condition ▪...
  • Page 172 VC MAX VRF 50/60Hz 4.10 xJ5E: Startup failed Digital display output Description ▪ The fan fails to be started. ▪ The fan stops running after the error. If the error disappears after five seconds, the fan starts again. Trigger / recover condition ▪...
  • Page 173 VC MAX VRF 50Hz/60Hz 4.11 xJ52: Locked-rotor protection Digital display output Description ▪ The fan is blocked. ▪ The fan stops running after the error. If the error disappears after five seconds, the fan starts again. Trigger / recover condition ▪...
  • Page 174 VC MAX VRF 50/60Hz 4.12 xJ6E: Motor lack of phase protection Digital display output Description ▪ The fan has phase loss protection. ▪ The fan stops running after the error. If the error disappears after five seconds, the fan starts again Trigger / recover condition ▪...
  • Page 175 VC MAX VRF 50Hz/60Hz 4.13 xJ65: Fan IPM Short Circuit Protection Digital display output Description ▪ The fan is in IPM short circuit protection. ▪ The fan stops running after the error. If the error disappears after five seconds, the fan starts again Trigger / recover condition ▪...
  • Page 176 VC MAX VRF 50/60Hz 5 Appendix 5.1 Resistance characteristics of temperature sensor Table 6-5.1: Temperature probe symbol and position Temperature probe symbol and position The probe type Outdoor ambient temperature Type A Liquid pipe stop valve Type A Microchannel heat exchanger inlet pipe Type A Microchannel heat exchanger outlet pipe Type A...
  • Page 177 VC MAX VRF 50Hz/60Hz (continues) Table 6-5.2: Temperature sensor temperature resistance characteristic table temperature resistance (kΩ) (°C) Type A Type B Type C 29.91 155.2 153.6 28.35 147.6 146.1 26.88 140.4 139.1 25.5 133.5 132.3 24.19 127.1 22.57 21.81 115.2 114.3 20.72 109.8...
  • Page 178 VC MAX VRF 50/60Hz (continues) Table 6-5.2: Temperature sensor temperature resistance characteristic table temperature resistance (kΩ) (°C) Type A Type B Type C 4.046 22.89 22.98 3.887 22.1 22.1 3.735 21.26 21.26 3.59 20.46 20.47 3.451 19.69 19.7 3.318 18.96 18.97 3.192 18.26...
  • Page 179 VC MAX VRF 50Hz/60Hz (continues) Table 6-5.2: Temperature sensor temperature resistance characteristic table temperature resistance (kΩ) (°C) Type A Type B Type C 0.8795 5.157 5.159 0.8525 0.8264 4.849 4.855 0.8013 4.703 4.705 0.7771 4.562 4.566 0.7537 4.426 4.431 0.7312 4.294 4.301 0.7094...
  • Page 180 VC MAX VRF 50/60Hz (continues) Table 6-5.2: Temperature sensor temperature resistance characteristic table temperature resistance (kΩ) (°C) Type A Type B Type C 0.2641 0.2576 0.2513 0.2451...
  • Page 181 VC MAX VRF 50Hz/60Hz 5.2 Normal status parameter of refrigerant system The parameters listed in Tables 6.5.3 need to be noted when the following conditions are met:: ▪ The master outdoor unit can detect all indoor machines: ▪ The number of indoor units displayed for outdoor units is consistent with the actual installation. ▪...
  • Page 182 VC MAX VRF 50/60Hz 5.3 Analysis of the cause of system anomalies Cause Analysis of Excessive discharge Temperature Check whether coil is not failure of SV7 coil properly installed failure of SV7 body Control failure of Control failure of mainboard Check whether coil failure of EEVC coil is normal...
  • Page 183 VC MAX VRF 50Hz/60Hz Cause Analysis of too high Pressure Stop valve is closed Check the stop valve The resistance of the Piping is bent or severely Check the pipe high-pressure side pipe deformed is too large Check whether there is a large temperature difference The pipe is blocked.
  • Page 184 VC MAX VRF 50/60Hz Cause Analysis of too Low Pressure Whether there is a big difference Failure of low Control failure of between the actual low pressure pressure sensor and the spot low pressure The compressor *cooling mode Check whether the power supply of capacity Mainboard is damaged...
  • Page 185 VC MAX VRF 50Hz/60Hz 5.4 Inverter drive board measurement guidelines Please give priority to the following things before testing Inverter drive board: Cut off the power supply: To avoid electric shock from capacitor discharge, power off for 10 minutes and wait for capacitor discharge before operation: Remove all wiring on the Inverter drive board.
  • Page 186 VC MAX VRF 50/60Hz Schematic diagram of measuring points of Inverter drive board:...
  • Page 187 VC MAX VRF 50Hz/60Hz 5.5 Appendix of Pressure Sensor Detection Pressure sensor characteristics 5.00 High Pressure sensor P Low Pressure sensor P 4.50 y = 2x + 0.5 y = 0.87x + 0.5 4.00 3.50 3.00 2.50 2.00 1.50 1.00 0.50 0.00 Pressure（MPa)
  • Page 188 VC MAX VRF 50/60Hz 5.6 Refrigerant volume diagnosis When running the refrigerant quantity detection program, the machine calculates the system refrigerant quantity according to the ambient temperature, condensing temperature and evaporation temperature, heat exchanger inlet and outlet temperature and other parameters, and give hints according to the results The detection results of the system have V6 IDUs may have a large deviation.
  • Page 189 VC MAX VRF 50Hz/60Hz Procedure Start Confirm whether the following two points meet the requirements: 1. Whether all IDUs in the system are V8 series? 2. Does the system choose V8 communication protocol or HyperLink? Whether the above two The detection results of the system have points are consistent V6 IDUs may have a large deviation Enter the refrigerant...
  • Page 190 VC MAX VRF 50/60Hz 5.7 Oil volume table Table 6-5.6: Oil volume table Compressor Compressor Total additional adding Oil model TOTAL OIL TOTAL OIL A (Y1) B (Y2) compressors oil oil Volume FV68H 1.1L 1.1L 5L+1.1L 6.1L 10HP FV68H 1.1L 1.1L 5L+1.1L 6.1L...
  • Page 191 S-VCMAX Ver. 2023-11 Professional Equipment Midea Group Add.: Midea Headquarters Building, 6 Midea Avenue, Shunde, Foshan, Guangdong, China Postal code: 528311 mbt.midea.com / global.midea.com/tsp.midea.com Note: Product specifications change from time to time as product improvements and developments are released and may vary from those in this document.

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