Midea V8 Series Service Manual
  1. Manuals
  2. Brands
  3. Midea Manuals
  4. Air Conditioner
  5. V8 Series
  6. Service manual
Midea V8 Series Service Manual

Midea V8 Series Service Manual

Hide thumbs Also See for V8 Series:
Table of Contents

Advertisement

Quick Links

Download this manual
Service
Manual
Commercial Air Conditioners
Series VRF
220-240V ~ 50Hz
MV8M-80WV2N1
MV8M-100WV2N1
MV8M-120WV2N1
MV8M-140WV2N1
MV8M-160WV2N1
R410A

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the V8 Series and is the answer not in the manual?

Questions and answers

Related Manuals for Midea V8 Series

Summary of Contents for Midea V8 Series

  • Page 1 R410A Commercial Air Conditioners Service Manual Series VRF 220-240V ~ 50Hz MV8M-80WV2N1 MV8M-100WV2N1 MV8M-120WV2N1 MV8M-140WV2N1 MV8M-160WV2N1...
  • Page 2 Service Manual...

  • Page 3: Table Of Contents

    V8 Mini R410A VRF 50Hz CONTENTS Part 1 General Information ................3 Part 2 Component Layout and Refrigerant Circuits ......... 18 Part 3 Control ....................26 Part 4 Field Settings ..................43 Part 5 Electrical Components and Wiring Diagrams ........ 57 Part 6 Diagnosis and Troubleshooting ............
  • Page 4 V8 Mini R410A VRF 50Hz...

  • Page 5: Part 1 General Information

    V8 Mini R410A VRF 50Hz Part 1 General Information 1 Indoor and Outdoor Unit Capacities ............. 4 2 External Appearance ..................6 3 Nomenclature ....................8 4 Combination Ratio ..................11 5 Selection Procedure ..................13...

  • Page 6: Indoor And Outdoor Unit Capacities

    V8 Mini R410A VRF 50Hz 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

    V8 Mini R410A VRF 50Hz 1.3 Outdoor Units Table 1-1.5: Outdoor unit capacity range Capacity(kW) Model Name MV8M-80WV2N1 MV8M-100WV2N1 MV8M-120WV2N1 12.3 MV8M-140WV2N1 14.0 MV8M-160WV2N1 15.5...

  • Page 8: External Appearance

    V8 Mini R410A VRF 50Hz 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 V8 Mini R410A VRF 50Hz 2.3 Outdoor Units Table 1-2.4: outdoor unit appearance 80/100/120/140/160 model...

  • Page 10: Nomenclature

    ○ ○ ○ ○ ○ 1 Legend Code Remarks Midea VRF indoor unit Function code H: HyperLink function Capacity index (the capacity in kW multiplied by 10) Indoor unit type Q1: One-way Cassette Q2: Two-way Cassette Q4C: Compact Four-way Cassette...
  • Page 11 ○ ○ ○ ○ ○ 1 Legend Code Remarks Midea VRF indoor unit Generation code 2: The 2nd generation 3: The 3rd generation Capacity index (the capacity in kW multiplied by 10) Indoor unit type Q1: One-way Cassette Q2: Two-way Cassette...
  • Page 12 ○ ○ ○ 1 ⑨ Legend Code Remarks Midea VRF indoor unit The 2 generation VRF DC indoor unit Capacity index (the capacity in kW multiplied by 10) Indoor unit type FA: Fresh Air Processing Unit Series category (D: DC series)

  • Page 13: Combination Ratio

    If all indoor units in system are V8 Series the total combination ratio must not exceed 160%. If there are non V8 series indoor unit in system the total combination ratio must not exceed 130% Piping between farthest indoor unit and first indoor branch joint should less than 40m.
  • Page 14 V8 Mini R410A VRF 50Hz Table 1-5.2: Combinations of indoor and outdoor units Outdoor unit Sum of capacity indexes of Sum of capacity indexes of connected indoor Maximum number of capacity connected indoor units units (fresh air processing units and standard connected indoor Capacity model...

  • Page 15: Selection Procedure

    V8 Mini R410A VRF 50Hz 5 Selection Procedure 5.1 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 16 V8 Mini R410A VRF 50Hz 5.2 Example The following is a selection example based on total heat load for cooling. Figure 1-5.1: Room plan Room B Room C Room A Room D Step 1: Establish design conditions  Indoor air temperature 25°C DB, 18°C WB; outdoor air temperature 33°C DB. ...
  • Page 17 V8 Mini R410A VRF 50Hz Table 1-5.2: Extract from medium static pressure duct (T2) cooling capacity table Indoor air temperature 14°C WB 16°C WB 18°C WB 19°C WB 20°C WB 22°C WB 24°C WB Capacity Model index 20°C DB 23°C DB 26°C DB 27°C DB 28°C DB...
  • Page 18 V8 Mini R410A VRF 50Hz Table 1-5.5: Combinations of Indoor and outdoor units Outdoor unit Sum of capacity indexes of capacity connected indoor units Capacity model (standard indoor units only) index 36 to 93.6 45 to 117 61.5 to 159.9 70 to 182 77.5 to 201.5 ...
  • Page 19 V8 Mini R410A VRF 50Hz Find the correction factor for piping length and level difference (“K1”) Figure 1-5.3: Mini 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 20: Part 2 Component Layout And Refrigerant Circuits

    V8 Mini R410A VRF 50Hz Part 2 Component Layout and Refrigerant Circuits 1 Layout of Functional Components .............. 19 2 Piping Diagrams ..................21 3 Refrigerant Flow Diagrams ................24...
  • Page 21 V8 Mini R410A VRF 50Hz 1 Layout of Functional Components 1.1 80/100 model layout of functional components Figure 2-1.1: 80/100 model layout of functional components Legend Parts name Parts name Compressor Electronic expansion valve (EEVA) Oil separator Plate heat exchanger High pressure switch Stop valve (liquid side) High pressure sensor...
  • Page 22 V8 Mini R410A VRF 50Hz 1.2 120/140/160 model layout of functional components Figure 2-1.2:120/140/160 model layout of functional components Legend Parts name Parts name Compressor Electronic expansion valve (EEVA) Oil separator Plate heat exchanger High pressure switch Stop valve (liquid side) High pressure sensor Stop valve (gas side) Check value...

  • Page 23: Piping Diagrams

    V8 Mini R410A VRF 50Hz 2 Piping Diagrams 2.1 80/100 model piping diagram Figure 2-2.1: 80/100 model piping diagram Legend Parts name Parts name Compressor Electronic expansion valve (EEVC) Oil separator Low pressure sensor High pressure switch Gas-liquid separator High pressure sensor Sensor Code Description Check value...
  • Page 24 V8 Mini R410A VRF 50Hz 2.2 120/140/160 model piping diagram Figure 2-2.2: 120/140/160 model piping diagram Legend Parts name Parts name Compressor Electronic expansion valve (EEVC) Oil separator Low pressure sensor High pressure switch Gas-liquid separator High pressure sensor Sensor Code Description Check value Heat exchanger pipe temperature sensor...
  • Page 25 V8 Mini R410A VRF 50Hz 2.3 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 26: Refrigerant Flow Diagrams

    V8 Mini R410A VRF 50Hz Refrigerant Flow Diagrams 3.1 Cooling operation Figure 2-3.1: Refrigerant flow during cooling operation 3.2 Heating operation Figure 2-3.2: Refrigerant flow during heating operation...
  • Page 27 V8 Mini R410A VRF 50Hz 3.3 Oil return operation in cooling mode Figure 2-3.3: Refrigerant flow during oil return operation in cooling mode 3.4 Oil return operation in heating mode and defrosting operation (4-way valve change direction) Figure 2-3.4: Refrigerant flow during oil return operation in heating mode and defrosting operation (4-way valve change direction)

  • Page 28: Part 3 Control

    V8 Mini R410A VRF 50Hz Part 3 Control 1 General Control Scheme Flowchart ............27 2 Stop Operation .................... 28 3 Standby Control ..................29 4 Startup Control ................... 29 5 Normal Operation Control ................32 6 Protection Control..................36 7 Special Control ....................

  • Page 29: General Control Scheme Flowchart

    V8 Mini R410A VRF 50Hz 1 General Control Scheme Flowchart Sections 2 to 8 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 Standby control Special control ...

  • Page 30: Stop Operation

    V8 Mini R410A VRF 50Hz 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 31: Standby Control

    V8 Mini R410A VRF 50Hz 3 Standby Control 3.1 Crankcase Heater Control The crankcase heater is used to prevent refrigerant from mixing with compressor oil when the compressors are stopped. The crankcase heater is controlled mainly according to the minimum of discharge temperatures. When the minimum of discharge temperatures is above 45°C, the crankcase heater is off;...
  • Page 32 V8 Mini R410A VRF 50Hz 4.3 Startup Control for Cooling Operation Table 3-4.1: Component control during startup in cooling mode Startup control Wiring Before Component startup STEP1 STEP2 STEP3 STEP4 STEP5 diagram label Initial step for 60S, Inverter adjust according to the high then+4Hz×Nodu / 20S.
  • Page 33 V8 Mini R410A VRF 50Hz 4.4 Startup Control for Heating Operation Table 3-4.2: Component control during startup in heating mode Startup control Wiring Before Component startup STEP1 STEP2 STEP3 STEP4 STEP5 diagram label Initial step for 60S, Adjust according to Inverter then+4Hz×Nodu / 20.

  • Page 34: Normal Operation Control

    V8 Mini R410A VRF 50Hz 5 Normal Operation Control 5.1 Component Control during Normal Operation Table 3-5.1: Outdoor unit component control during normal operation Wiring Component Cooling Heating diagram label PI control, High pressure protection, Low pressure protection, Discharge temperature protection, Inverter Over-current protection control, Inverter module Inverter compressor A COMP(A)

  • Page 35: Heat Exchanger Control

    V8 Mini R410A VRF 50Hz 5.2 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 36: Electronic Expansion Valve Control

    V8 Mini R410A VRF 50Hz 5.5 Electronic Expansion Valve Control 5.5.1EEVA control The positions of electronic expansion valves EEVA are controlled in steps from 0/0 (fully closed) to 480/2880 (fully open). 5.5.1.1 Outdoor unit heat exchanger is performed via the evaporator This function is used to exert PI control on the electronic expansion valve EEVA so that the minimum of discharge temperatures (T7C_min) will become T7CS.

  • Page 37: Outdoor Fan Control

    V8 Mini R410A VRF 50Hz 5.6 Outdoor Fan Control The speed of the outdoor unit fans is adjusted in steps, as shown in Table 3-5.9 Fan speed (rpm) Note Fan speed cooling heating index 80-100 model 120-160 model Stop operation, Startup Startup or defrosting or defrosting control[1] control[1]...

  • Page 38: Protection Control

    V8 Mini R410A VRF 50Hz 6 Protection Control 6.1 High Pressure Protection Control This control protects the system from abnormally high pressure and protects the compressors from transient spikes in pressure. Figure 3-6.1: High pressure protection control Normal operation 4.15MPa <...
  • Page 39 V8 Mini R410A VRF 50Hz 6.4 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 3-6.6: Over-current protection control Normal operation Current Current...
  • Page 40 V8 Mini R410A VRF 50Hz 6.6 Inverter Module Temperature 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. 6.6.1 Error code F62 Figure 3-6.9: Inverter module temperature protection control Normal operation Ntc <80°C...

  • Page 41: Special Control

    V8 Mini R410A VRF 50Hz 6.8 High Pressure Ratio Protection Control This high pressure ratio protection control is used to prevent the activation of protection devices due to abnormal increase of high pressure ratio, and to protect compressors against the transient increase of high pressure ratio. It is performed for entire system.

  • Page 42: Defrosting Operation

    V8 Mini R410A VRF 50Hz Cooling indoor unit 500P EEV Thermo ON unit Thermo OFF unit Keep the previous fan speed Stop or Fan Thermo ON unit Superheat control Electronic expansion valve (EEV) Thermo OFF unit 80pls Stop or Fan 80pls 7.1.2 Heating Oil Return Control It’s basically identical with defrosting operation, refer to 7.2 Defrosting Operation...

  • Page 43: Other Control

    V8 Mini R410A VRF 50Hz Heating indoor unit (ODU operates cooling main operation) 500PEEV Thermo ON unit Thermo OFF unit Stop Thermo ON unit Within 2min: 480pls Electronic expansion valve (EEV) Thermo OFF unit 2-4min: 300pls After 4min: 120pls Stop or error stop 8 Other Control 8.1 Overload control Overload control is used to maintain comfort requirement (i.e.

  • Page 44: Low Noise Mode

    V8 Mini R410A VRF 50Hz 8.3 Auto Snow-blowing Control Auto snow-blowing control is used to prevent the fans of stopped outdoor units from destroying by heavy snow. Timing of auto snow-blowing operation: T4≤3°C and outdoor units stops time elapse for TA. Table 3-8.3: Snow-blowing control TA: Level a TA: Level b...

  • Page 45: Part 4 Field Settings

    V8 Mini R410A VRF 50Hz Part 4 Field Settings Overview ....................44 Digital display and button settings ............44 System Parameter Check ................ 54...
  • Page 46 V8 Mini R410A VRF 50Hz 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 2.

  • Page 47: Menu Mode

    V8 Mini R410A VRF 50Hz 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 "n0". 2.
  • Page 48 V8 Mini R410A VRF 50Hz 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...
  • Page 49 V8 Mini R410A VRF 50Hz Table 4-2.3 Menu mode function(continue) First level menu Second level menu Specified menu mode Description Default √ 0Pa static pressure 10Pa static pressure 20Pa static pressure (static pressure) 30Pa static pressure 35Pa static pressure Power limitation mode, (Power limitation Maximum current =MCA * setting value mode)
  • Page 50 V8 Mini R410A VRF 50Hz Table 4-2.3 Menu mode function(continue) Default First level menu Second level menu Specified menu mode Description Sensors backup running unavailable √ Sensors backup running available (Manual) (Sensors) Sensors backup running available (Automatic) Backup operation time setting(1 day) Backup operation time setting(2 days) n5[1] (Backup)
  • Page 51 V8 Mini R410A VRF 50Hz Table 4-2.3 Menu mode function(continue) First level menu Second level menu Specified menu mode Description Default Dry contact 1 function selection (Force cooling only ) Dry contact 1 function selection (Force heating only ) Dry contact 1 function selection (Force incapacity requirements ) √...
  • Page 52 V8 Mini R410A VRF 50Hz 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. There are ten priority mode options: 1.
  • Page 53 V8 Mini R410A VRF 50Hz 5. Changeover mode: Before using this mode, you need to set the VIP indoor unit address. The default VIP address is 63, the VIP address also can be changed through menu mode“n1-6”. In changeover mode, if the VIP indoor unit is operating, the outdoor units will operate in the mode of the VIP indoor unit.
  • Page 54 V8 Mini R410A VRF 50Hz Step1:preparation Step2:Calculate static pressure of Outdoor unit Step3:Indoor and outdoor Display error code temperatures are within the allowable U32/U33/U34 range of test run The number of Indoor units Turn on all indoor units is greater than 4 Start the Indoor unit with singular address Step4:The stop valve has been opened...
  • Page 55 V8 Mini R410A VRF 50Hz 2.4.3 Refrigerant recovery In this mode, the operation process is as follows: Refrigerant recovery to outdoor unit: (1) First, close the liquid pipe stop valve and keep the gas pipe stop valve open; (2) Menu setting [n1-2-0], the system enters the refrigerant recovery mode, when the digital display alternately "End" and the system low pressure value, close the gas pipe stop valve.
  • Page 56 V8 Mini R410A VRF 50Hz 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 57 V8 Mini R410A VRF 50Hz Table 4-3.1 system check list(continue): DSP1 content Parameters displayed on DSP2 Remarks 31.-- EEVA position Actual value = value displayed × 24 32.-- Reserved 33.-- EEVC position Actual value = value displayed × 4 34.-- Reserved 35.-- Compressor discharge pressure (MPa)
  • Page 58 V8 Mini R410A VRF 50Hz Table 4-3.1 system check list(continue): DSP1 content Parameters displayed on DSP2 Remarks Dirty blockage rate 52.-- 0~10, 10 represents the worst (outdoor heat exchanger) 53.-- Fan historical error 54.-- Software version 55.-- Most recent error or protection code 56.-- Reserved 57.--...

  • Page 59: Part 5 Electrical Components And Wiring Diagrams

    V8 Mini R410A VRF 50Hz Part 5 Electrical Components and Wiring Diagrams Outdoor Unit Electric Control Box Layout ..........58 Outdoor Unit Main Control Board ............60 Compressor & Fan drive board ............... 64 Wiring Diagrams ..................66...

  • Page 60: Outdoor Unit Electric Control Box Layout

    V8 Mini R410A VRF 50Hz 1. Outdoor Unit Electric Control Box Layout 1.1 Electric control box Figure 5-1.2: Electric control box 1.2 Compressor & Fan Driver Board Figure 5-1.2: Compressor & Fan Driver Board...

  • Page 61: Power Supply Terminals

    V8 Mini R410A VRF 50Hz 1.3 Power Supply Terminals Figure 5-1.4: Power Supply Terminals...

  • Page 62: Outdoor Unit Main Control Board

    V8 Mini R410A VRF 50Hz 2. Outdoor Unit Main Control Board 2.1 Outdoor unit main Control Board ports Figure 5-2.1: Outdoor unit main Control Board ports ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ○ Notes: Label descriptions are given in Table 5-2.1: Main Control Board port...
  • Page 63 V8 Mini R410A VRF 50Hz Table 5-2.1: Main Control Board port Label in Figure Port code Content Port voltage 5-2.1 CN70 EEVA drive port 12Vdc CN72 EEVC drive port 12Vdc Liquid pipe inlet temperature sensor(T5) /Plate heat exchanger outlet temperature sensor(T6B) /Suction temperature sensor 1 (T71) 3.3Vdc /Discharge temperature sensor 1 (T7C1)
  • Page 64 V8 Mini R410A VRF 50Hz 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 65 V8 Mini R410A VRF 50Hz 2.2.3 Digital display output Table 5-2.3: 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 66: Compressor & Fan Drive Board

    V8 Mini R410A VRF 50Hz Compressor & Fan drive board 3.1 Compressor & Fan drive board ports Figure 5-3.1: 3.1 Compressor & Fan drive board ports Notes: Label descriptions are given in Table 5-3.1: Compressor & Fan drive board ports...
  • Page 67 V8 Mini R410A VRF 50Hz Table 5-3.1: Compressor & Fan drive board ports Label in Figure Port code Content Port voltage 5-2.1 Power input port N AC 220-240V Power input port L AC 220-240V CN11 Main Control Board Power input port AC 220-240V CN16 Relay control input port...

  • Page 68: Wiring Diagrams

    V8 Mini R410A VRF 50Hz 4. Wiring Diagrams Figure 5-3.1: V8 Mini outdoor unit wiring diagram...

  • Page 69: Part 6 Diagnosis And Troubleshooting

    V8 Mini R410A VRF 50Hz Part 6 Diagnosis and Troubleshooting 1 Error Code Table ..................68 2 Error in Main Control .................. 73 3 Error in Compressor Driver ............... 137 4 Error in Fan Drive ..................147 5 Appendix ....................156...
  • Page 70 V8 Mini R410A VRF 50Hz 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 Outdoor unit’s Emergency shutdown fault Outdoor unit’s Inverter driver board does not match the main control board fault communication Communication error between indoor and outdoor unit...
  • Page 71 V8 Mini R410A VRF 50Hz Manual re-start Error code Error description Remarks required Troubleshoot errors according to 1J-- Fan motor error, “--” refer to Table 6-1.4 Fan motor error code table the Service Manual High pressure sensor error sensor error Pressure High pressure protection protection...
  • Page 72 V8 Mini R410A VRF 50Hz 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 System Outdoor unit model is not set configuration System Outdoor unit Capacity setting error configuration System System contains the old Indoor Unit with old platforms...
  • Page 73 V8 Mini R410A VRF 50Hz 1.3 Compressor drive error code table Table 6-1.3 Compressor drive error code table Manual re-start Error code Error description Remarks required 1L1E Hardware overcurrent current overload 1L11 Software overcurrent error 1L12 Software overcurrent protection last 30s Over-temperature 1L2E Module overtemperature protection...
  • Page 74 V8 Mini R410A VRF 50Hz 1.5 Status prompt code table Table 6-1.5 Status prompt code table Manual re-start Status code Code description Remarks required2 Oil return,”x” is the current step node Status hint Defrost, ”x” is the current step node Status hint The outdoor ambient temperature exceeds the upper limit Status hint...
  • Page 75 V8 Mini R410A VRF 50Hz 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 Trigger / recover condition (1)Check menu N28 = 0: ...
  • Page 76 V8 Mini R410A VRF 50Hz Menu option NC0=3 or NC1=3? Menu option N28=0? CN55/CN56 short CN55/CN56 open circuit circuit Rule out short Rule out open circuit condition circuit condition Automatic recovery Error in the main after 5s? control board Replace the main- control board troubleshooting...
  • Page 77 V8 Mini R410A VRF 50Hz 2.2 AA1: Inverter driver board does not match the main control board Digital display output Description  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 78 V8 Mini R410A VRF 50Hz 2.3 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 outdoor unit Trigger / recover condition ...
  • Page 79 V8 Mini R410A VRF 50Hz Procedure Replace the communication cable HyperLink Diameter of with the diameter specified in the communication line＜1.5mm2 installation manual Add a repeater at the The total length of HyperLink communication place 200 communication cables exceeds meters from the outside 200 meters without a repeater machine to the inside machine Connect the communication line of...
  • Page 80 V8 Mini R410A VRF 50Hz 2.4 U38: Outdoor Unit has no address. Digital display output Description  Outdoor Unit has no address.  The ODU with error can not run.  The outdoor unit cannot communicate with indoor units. Trigger / recover condition ...
  • Page 81 V8 Mini R410A VRF 50Hz 2.5 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 outdoor unit. Trigger / recover condition ...
  • Page 82 At least one 2rd IDU exists in the system Non-V8 communication protocol RS-485 (P Q E) All the existing IDUs in the system are V8 series and Use PQ communication port and enter N45-0 to choose V8 use Hyper-Link communication protocol...
  • Page 83 V8 Mini R410A VRF 50Hz 2.6 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 outdoor unit Trigger / recover condition ...
  • Page 84 V8 Mini R410A VRF 50Hz Procedure Power on the IDUs again and check "Number of online units" after 6 minutes of standby[1] Check whether the number There are IDUs Check the power cord of the IDUs, and of online IDUs is consistent with not powered on in set the address for the IDU by the setting number...
  • Page 85 V8 Mini R410A VRF 50Hz 2.7 C28: Abnormal increase in the number of indoor units Digital display output Description  Abnormal increase in the number of indoor units  All units stop running.  Error code is only displayed on the outdoor unit Trigger / recover condition ...
  • Page 86 V8 Mini R410A VRF 50Hz Procedure Power on the ODU again and check "Number of Remove IDUs of other systems online units" after 6 minutes of standby[1] whether the number of online Check whether other The ODU mainboard is damaged. IDU is consistent with the actual IDUs are connected to Replace the mainboard...
  • Page 87 V8 Mini R410A VRF 50Hz 2.8 1C41: Communication Error between main control board and inverter driver board Digital display output Description  The communication between the main control board and inverter driver board is error  All units stop running. Trigger / recover condition ...

  • Page 88: Sensor Failure

    V8 Mini R410A VRF 50Hz 2.9 E41,F31,F41,F71,F91,FA1,FC1,Fd1: Temperature sensor error Digital display output Error code Error description Remarks Digital display output Outdoor ambient temperature sensor sensor error (T4) error(open/short) Plate heat exchanger outlet temperature sensor(T6B) sensor error error(open/short) Main heat exchanger pipe temperature sensor error sensor (T3) error(open/short) Discharge temperature...
  • Page 89 V8 Mini R410A VRF 50Hz  The main control board is damaged Procedure Sensor error Temperature sensor Ensure the sensor is connection on ODU mainBoard connected properly is loose[1] Temperature Troubleshooting ? Sensor has short-circuited Replace the sensor or failed[2][3] Replace the main Troubleshooting ? control board...
  • Page 90 V8 Mini R410A VRF 50Hz 2.10 F62, F6A: Inverter driver board NTC overtemperature protection Digital display output Description  All units stop running  Error code is displayed on the unit with the error. Trigger/ Recover condition  Trigger condition: F62: The NTC temperature inside the compressor board or fan module is higher than 100 °...
  • Page 91 V8 Mini R410A VRF 50Hz Procedure F62，F6A Power on again, Refastening Screws on the module screw[1] board are not secured troubleshooting？ Brush a layer of thermal grease Check whether the Power on again, evenly[2], and thermal grease layer is tighten the screws troubleshooting？...
  • Page 92 V8 Mini R410A VRF 50Hz 2.11 F63: Non-inductive resistance Tr overtemperature protection Digital display output Description  All units stop running  Error code is displayed on the outdoor unit with the Error Trigger/ Recover condition  Trigger condition: The non-inductive resistance temperature exceeds 95 ° C ...
  • Page 93 V8 Mini R410A VRF 50Hz Procedure The Recirculation Fan in the electric control box works Top Flow Series improperly The air intake grille at the bottom of the machine or the internal air duct removal of fault refer to is blocked the procedure of xb53 Clean up Power on again, and...
  • Page 94 V8 Mini R410A VRF 50Hz 2.12 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 95 V8 Mini R410A VRF 50Hz Procdure F72/F7A .Discharge temperature Reconnect the sensor sensors' connections on main to the Main control control board are loose[1] board Error disappear Troubleshooting The temperature sensor Replace the is abnormal[2] temperature sensor check whether there is a big The main control board difference between the measured is damaged.
  • Page 96 V8 Mini R410A VRF 50Hz 2.13 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 97 V8 Mini R410A VRF 50Hz Procedure The Discharge Ensure that the Discharge temperature temperature sensor is not sensor is properly connected and located at properly connected [1] the top of the compressor Discharge temperature Replace the sensor sensor failure [2] Replacing the high High pressure sensor failure[3] pressure Sensor...
  • Page 98 V8 Mini R410A VRF 50Hz 2.14 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 99 V8 Mini R410A VRF 50Hz 2.15 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 100 V8 Mini R410A VRF 50Hz Procedure The stop valves are close Open the stop valves 1. Connect pressure gauge to test Discharge pressure 2. Power on and run again, and check the low pressure value Check whether the pressure Discharge part of the refrigerant. Add sensor is normal[1] oil if it leaks during discharge Compare the pressure...
  • Page 101 V8 Mini R410A VRF 50Hz 2.16 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≥ 4.2MPa. ...
  • Page 102 V8 Mini R410A VRF 50Hz Procedure Ensure th e following 3 points: 1. Th e stop valve has been opened 2. Th e pressure switch is properly connected to the compressor module board 3. Th e pressure switch is in normal conduction state Th e 3 points above is normal Correct and reconfirm...
  • Page 103 V8 Mini R410A VRF 50Hz 2.17 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 slave unit with the error. Trigger / recover condition ...
  • Page 104 V8 Mini R410A VRF 50Hz Procedure Check whether the sensor is Reconnect Sensor according properly and securely connected to the wiring diagram to the mainboard 1.Use pressure gauge to measure the low pressure 2. Use multimeter to measure the pressure sensor output voltage Whether the measured pressure value and output voltage Replace the...
  • Page 105 V8 Mini R410A VRF 50Hz 2.18 P22, P25: Low pressure protection Digital display output Description  All units stop running.  Error code is displayed on the unit with the error. Trigger/ Recover condition  Trigger condition:  P22: suction pressure < 0.07MPa. ...
  • Page 106 V8 Mini R410A VRF 50Hz Procedure P22/P25 Ensure th e following 2 points: 1. Th e stop valve has been opened 2. Th e Low pressure sensor is properly connected to the compressor module board Th e 2 points above is normal Correct and reconfirm Operating system and measure the low pressure...
  • Page 107 V8 Mini R410A VRF 50Hz 2.19 P24: Abnormal elevation of low pressure Digital display output Description  All units stop running.  Error code is displayed on the unit with the error Trigger/ Recover condition  Trigger condition: Suction pressure >1.6MPa and lasts 60 minutes ...
  • Page 108 V8 Mini R410A VRF 50Hz 2.20 1P32, 1P33: Compressor high DC bus current protection Digital display output Description  The DC bus current of 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 109 V8 Mini R410A VRF 50Hz Procedure 1P32,1P33 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 110 V8 Mini R410A VRF 50Hz 2.21 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 111 V8 Mini R410A VRF 50Hz 2.22 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 112 V8 Mini R410A VRF 50Hz Procedure Check the power input: 1. Whether the input voltage is within the allowed range (±10%) 2. Whether the input power supply is phase missing or wiring error 3. Whether the three-phase input voltage imbalance is less than 12V Whether the power Repairing the input input is abnormal...
  • Page 113 V8 Mini R410A VRF 50Hz 2.23 P53: Phase B and N of the power cable are connected to the opposite protection Digital display output Description  System zero line, phase line reverse connection  All units stop running  Error code is displayed on the unit with the error Trigger / recover condition ...
  • Page 114 V8 Mini R410A VRF 50Hz Procedure Whether there is any abnormality in Replace inverter the input voltage of the power supply of the control board inverter drive board [1] Whether the line connection is normal Ensure proper (Whether the connection is missed or the wiring screw is not tight) Whether the power supply...
  • Page 115 V8 Mini R410A VRF 50Hz 2.24 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 116 V8 Mini R410A VRF 50Hz 2.25 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 117 V8 Mini R410A VRF 50Hz Procedure Standby check whether the three- Rectify the power phase input power supply of the inverter drive supply board is missing phase or wrong phase Main relay of Standby measure whether L1L2 relay output Replace the Inverter inverter drive board is missing phase drive board...
  • Page 118 V8 Mini R410A VRF 50Hz 2.26 1P56: Inverter driver board DC bus voltage is too low Digital display output Description  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 119 V8 Mini R410A VRF 50Hz 2.27 1P57: Inverter driver board DC bus voltage is too high Digital display output Description  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 120 V8 Mini R410A VRF 50Hz 2.28 1P58: Inverter driver board DC bus voltage is seriously too high Digital display output Description  Inverter driver board DC bus voltage is seriously too high  All units stop running..  The error is displayed separately on each Outdoor Unit. Trigger / recover condition ...
  • Page 121 V8 Mini R410A VRF 50Hz 2.29 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 122 V8 Mini R410A VRF 50Hz 2.30 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: No IDU is in power down mode and the feedback voltage of the HyperLink board is > 1.5V for 120ms. ...
  • Page 123 V8 Mini R410A VRF 50Hz Procedure Remove the ODU M1M2 communication The ODU mainboard continues to restart, and the LED3 ODU mainboard is cable and measure whether there is a short circuit on the right side of HyperLink board lights up damaged, replace it between the two communication cables Measure whether there is a short circuit...
  • Page 124 V8 Mini R410A VRF 50Hz 2.31 xb01: The electronic expansion valve is in error Digital display output Description  No.x electronic expansion valve’s connection on main control board is missing(1 to 4 correspond to expansion valves A, B, C, and E respectively) ...
  • Page 125 V8 Mini R410A VRF 50Hz Procedure xb01 No.x electronic expansion valve s connection on Ensure the connection is main control board is missing correct and firm. or loose[1] Electronic expansion valve main control coil has malfunction [2] board is damaged Replace the main Replace the electronic control board...
  • Page 126 V8 Mini R410A VRF 50Hz 2.32 U11: Outdoor unit model is not set Digital display output Description  All units stop running  Error code is displayed on the unit with the error Trigger / recover condition  Trigger condition: The model information is not set. ...
  • Page 127 V8 Mini R410A VRF 50Hz 2.33 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 128 V8 Mini R410A VRF 50Hz 2.34 U21: The indoor unit connection is incorrect Digital display output Description  The indoor unit connection is incorrect  All Outdoor units stop running  Error is only displayed in main control board Trigger / recover condition ...
  • Page 129 V8 Mini R410A VRF 50Hz 2.35 U31: The test run was never successful Digital display output Description  The test run was unsuccessful  All units stop running  Error code is only displayed on the outdoor unit. Trigger / Recover condition ...

  • Page 130: Trigger Condition

    V8 Mini R410A VRF 50Hz 2.36 U32, U33, U34: The temperature is not suitable for test run Digital display output Description  Ambient temperature is out the allowed range of test run  All units stop running  Error code is only displayed on Outdoor Unit Trigger /Recover condition ...
  • Page 131 V8 Mini R410A VRF 50Hz Procedure U32\U33\U34 Check whether the ambient temperature is within the allowed range Termination of test run of test operation Power it on again and Rest runt in 30 minutes Troubleshooting...
  • Page 132 V8 Mini R410A VRF 50Hz 2.37 U35, U37: Stop valve is not open Digital display output Description  Stop valve is not open  All units stop running  Error code is only displayed on the outdoor unit. Trigger/ Recover condition ...
  • Page 133 V8 Mini R410A VRF 50Hz 2.38 U3A: The communication cable is connected incorrectly Digital display output Description  There are indoor unit in the communication system outside the refrigerant system.  All units stop running  Error code only displayed on the outdoor unit. Trigger / Recover condition ...
  • Page 134 V8 Mini R410A VRF 50Hz 2.39 U3b: The installation environment is abnormal Digital display output Description  During the test run, abnormal changes in ambient temperature are detected and the operation is stopped.  All units stop running  Error code only displayed on the outdoor unit. Trigger / Recover condition ...
  • Page 135 V8 Mini R410A VRF 50Hz Procedure Reinstall according to the Check whether the ventilation and heat dissipation are good and INSTALLATION AND meet installation requirements OWNER S MANUAL Remove other ODUs or Check whether return air heat sources, or transfer of the ODU is affected by other the machine to a well- heat sources or ODUs...
  • Page 136 V8 Mini R410A VRF 50Hz 2.40 U3C: Changeover mode error Digital display output Description  The ODU in changeover mode doesn’t detect the signal of VIP IDU.  ODUs stop running  Error code only displayed on the outdoor unit. Trigger / Recover condition ...
  • Page 137 V8 Mini R410A VRF 50Hz 2.41 U4x: Overconnection ratio Digital display output Description  Protection Overconnection ratio  All units stop running Trigger / Recover condition  Trigger condition: Code of Indoor Unit and type analysis Code of Indoor Unit Indoor Unit Indoor Unit Indoor Unit...
  • Page 138 V8 Mini R410A VRF 50Hz Possible causes Indoor/Outdoor Unit connection rate out of allowable range Procedure Check the indoor unit connection and remove the indoor unit beyond the permitted range Power on and check again Troubleshooting...
  • Page 139 V8 Mini R410A VRF 50Hz 3 Error in Compressor Driver 3.1 1L1E: Hardware overcurrent Digital display output Description  The current exceeds the OCP protection value (peak value) set by the hardware or the IPM module receives an FO signal ...
  • Page 140 V8 Mini R410A VRF 50Hz Procedure 1L1E Replace the inverter driver Failure during standby board Compressor windings short-circuit Replace the compressor between phases Replace inverter diver board , Troubleshooting and the error code disappear abnormal sound or Check whether indoor unit Replace the indoor unit shaking in compressor electronic expansion valve can...
  • Page 141 V8 Mini R410A VRF 50Hz 3.2 1L11, 1L12 : Software overcurrent Digital display output Description  The current exceeds the OCP 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 142 V8 Mini R410A VRF 50Hz 3.3 1L2E: Module overtemperature protection Digital display output Description  The temperature of the IPM exceeds 105° 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 143 V8 Mini R410A VRF 50Hz 3.4 1L3E: 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 compressor stops running after the error occurs. If the error disappears one minute later, the compressor starts again.
  • Page 144 V8 Mini R410A VRF 50Hz 3.5 1L31: 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 145 V8 Mini R410A VRF 50Hz 3.6 1L32: 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 146 V8 Mini R410A VRF 50Hz 3.7 1L43: The current sampling bias is abnormal. Digital display output Description  Bias calibration of the current sampling circuit is in error.ias calibration of the current sampling circuit is in error.  After this error occurs, the compressor cannot start. Check whether the inverter driver board is in error. Trigger / recover condition ...
  • Page 147 V8 Mini R410A VRF 50Hz 3.8 1L5E: 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 148 V8 Mini R410A VRF 50Hz 3.9 1L52: 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 149 V8 Mini R410A VRF 50Hz 4 Error in Fan Drive 4.1 1J1E: Hardware overcurrent Digital display output Description  The current exceeds the OCP protection value (peak value) set by the hardware or the IPM module receives an FO signal ...
  • Page 150 V8 Mini R410A VRF 50Hz 4.2 1J11, 1J12: Software overcurrent Digital display output Description  The current exceeds the OCP protection value set by 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 151 V8 Mini R410A VRF 50Hz 4.3 1J2E: Module overtemperature protection Digital display output Description  The temperature of the IPM exceeds 105°.  The fan stops running after the error. If the error disappears after five seconds, the fan starts again. Trigger / recover condition ...
  • Page 152 V8 Mini R410A VRF 50Hz 4.4 1J3E: 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 153 V8 Mini R410A VRF 50Hz 4.5 1J31: 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 fan stops running after the error occurs. If the error disappears five seconds later, the fan starts again. Trigger / recover condition ...
  • Page 154 V8 Mini R410A VRF 50Hz 4.6 1J32: 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 fan stops running after the error occurs. If the error disappears five seconds later, the fan starts again. Trigger / recover condition ...
  • Page 155 V8 Mini R410A VRF 50Hz 4.8 1J5E: 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 156 V8 Mini R410A VRF 50Hz 4.9 1J52: 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 157 V8 Mini R410A VRF 50Hz 4.10 1J6E: 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 158 V8 Mini R410A VRF 50Hz 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 Bottom of heat exchanger Type A Outdoor ambient temperature Type A Liquid pipe stop valve Type A Plate heat exchanger inlet pipe Type A...
  • Page 159 V8 Mini R410A VRF 50Hz (continues) Table 6-5.2: Temperature sensor temperature resistance characteristic table temperature resistance (kΩ) (°C) Type A Type B Type C 33.33 171.9 169.9 31.56 163.3 161.5 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...
  • Page 160 V8 Mini R410A VRF 50Hz (continues) Table 6-5.2: Temperature sensor temperature resistance characteristic table temperature resistance (kΩ) (°C) Type A Type B Type C 4.387 24.85 24.85 4.213 23.89 23.9 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...
  • Page 161 V8 Mini R410A VRF 50Hz (continues) Table 6-5.2: Temperature sensor temperature resistance characteristic table temperature resistance (kΩ) (°C) Type A Type B Type C 0.9366 5.488 5.492 0.9075 5.32 5.322 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...
  • Page 162 V8 Mini R410A VRF 50Hz (continues) Table 6-5.2: Temperature sensor temperature resistance characteristic table temperature resistance (kΩ) (°C) Type A Type B Type C 0.2777 1.632 0.2708 0.2641 0.2576 0.2513 0.2451...
  • Page 163 V8 Mini R410A VRF 50Hz 5.2 Normal status parameter of refrigerant system The parameters listed in Tables 5.2.1 and 5.2.2 need to be noted when the following conditions are met::  The master can detect all indoor machines:  The number of indoor units displayed for outdoor units is consistent with the actual installation. ...
  • Page 164 V8 Mini R410A VRF 50Hz 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...
  • Page 165 V8 Mini R410A VRF 50Hz 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 166 V8 Mini R410A VRF 50Hz 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 167 V8 Mini R410A VRF 50Hz 5.4 Outdoor unit main Control Board ports table Figure 6-5.1: Outdoor unit main Control Board ports ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ○...
  • Page 168 V8 Mini R410A VRF 50Hz Table 6-5.5: Main Control Board port definition Table Label in Figure Port code Content Port voltage 5-2.1 CN70 EEVA drive port 12Vdc CN72 EEVC drive port 12Vdc Liquid pipe inlet temperature sensor(T5) /Plate heat exchanger outlet temperature sensor(T6B) /Suction temperature sensor 1 (T71) 3.3Vdc /Discharge temperature sensor 1 (T7C1)
  • Page 169 V8 Mini R410A VRF 50Hz 5.5 Compressor & Fan drive board ports detection Port reference and function definition of Compressor & Fan drive board Figure 6-5.2: Compressor & Fan drive board ports Table 6-5.5: Port definition and functions table Label in Figure Port code Content Port voltage...
  • Page 170 V8 Mini R410A VRF 50Hz 5.6 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...
  • Page 171 V8 Mini R410A VRF 50Hz 5.7 Oil volume table Table 6-5.6: Oil volume table Compressor additional adding Model Oil model TOTAL OIL TOTAL OIL A (Y1) oil Volume FV68H 0.67L 0.6L 0.67L+0.6L 1.27L FV68H 0.67L 0.6L 0.67L+0.6L 1.27L FV68H 1.0L 1.2L 1.0L+1.2L 2.2L...
  • Page 172 Add.: Midea Headquarters Building, 6 Midea Avenue, Shunde, Foshan, Guangdong, China Postal code: 528311 mbt.midea.com / global.midea.com/tsp.midea.com Midea reserves the right to change the specifications of the product, and to withdraw or replace products without prior notif ication or public announcement. Midea is constantly developing and improving its products.

This manual is also suitable for:

Mv8m-80wv2n1Mv8m-100wv2n1Mv8m-120wv2n1Mv8m-140wv2n1Mv8m-160wv2n1

Table of Contents