Midea V6R VRF Series Service Manual
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Midea V6R VRF Series Service Manual

R410a commercial air conditioners
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  • Page 1 R410A Commercial Air Conditioners Service Manual MV6-R252WV2RN1 MV6-R400WV2RN1 MV6-R280WV2RN1 MV6-R450WV2RN1 MV6-R335WV2RN1 MV6-R500WV2RN1...
  • Page 2 V6R VRF 50Hz CONTENTS Part 1 General Information ................ 3 Part 2 Component Layout and Refrigerant Circuits ........ 13 Part 3 Control .................... 25 Part 4 Field Settings ................. 51 Part 5 Electrical Components and Wiring Diagrams ....... 57 Part 6 Diagnosis and Troubleshooting ............. 83...
  • Page 3 V6R VRF 50Hz...
  • Page 4 V6R VRF 50Hz Part 1 General Information 1 Indoor and Outdoor Unit Capacities ............4 2 External Appearance ................5 3 Outdoor Unit Combinations ..............10 4 Combination Ratio ................. 11...

  • Page 5: Indoor And Outdoor Unit Capacities

    V6R VRF 50Hz 1 Indoor and Outdoor Unit Capacities 1.1 Indoor Units 1.1.1 VRF indoor units Table 1-1.1: Standard indoor unit abbreviation codes Abbreviation Abbreviation Type Type code code One-way Cassette High Static Pressure Duct Two-way Cassette Wall-mounted Compact Four-way Cassette Ceiling &...
  • Page 6 V6R VRF 50Hz 1.1.2 Fresh air processing unit Table 1-1.3: Fresh air processing unit capacity range Capacity 12.5kW 14kW 20kW 25kW 28kW Capacity index Notes: V6R series outdoor units are compatible with the 2nd generation DC Fresh air processing unit. 1.2 Heat recovery ventilator Table 1-1.4: Heat recovery ventilator capacity range Capacity...

  • Page 7: External Appearance

    V6R VRF 50Hz 2 External Appearance 2.1 Indoor Units Table 1-2.1: Indoor unit appearance One-way Cassette Two-way Cassette Compact Four-way Cassette Four-way Cassette Medium Static Pressure Duct High Static Pressure Duct Wall-mounted Ceiling & Floor Floor Standing Console 2.1.1 Fresh air processing unit Table 1-2.2: Fresh air processing unit appearance Fresh Air Processing Unit...
  • Page 8 V6R VRF 50Hz 2.2 Heat Recovery Ventilator Table 1-2.3: Heat recovery ventilator appearance Heat Recovery Ventilator 2.3 High Temperature Hydro Module Table 1-2.4: High temperature Hydro module appearance High Temperature Hydro Module...
  • Page 9 V6R VRF 50Hz 2.4 Outdoor Units 2.4.1 Single units Table 1-2.5: Single outdoor unit appearance 8/10/12HP 14/16/18HP (with single fan) (with dual fan) 2.4.2 Combinations of units Table 1-2.6: Combination outdoor unit appearance 20/22HP 24/26/28/30HP 32/34/36HP 38/40HP 42/44HP 46/48/50/52/54HP...
  • Page 10 V6R VRF 50Hz 2.5 Mode Selection Box Table 1-2.7: MS box appearance Max. number of Model name Appearance downstream indoor units MS01/N1-D MS04/N1-D MS06/N1-D MS08/N1-D MS10/N1-D MS12/N1-D Notes: MS01 can be ceiling-suspended installed and wall-mounted installed. Low temperature cooling operation and leakage detection function are available in MS01.

  • Page 11: Outdoor Unit Combinations

    V6R VRF 50Hz 3 Outdoor Unit Combinations Table 1-3.1: Outdoor unit combinations System capacity Modules Number Outdoor branch of units joint kit 22.4 ● 28.0 ● 33.5 ● — 40.0 ● 45.0 ● 50.0 ● 56.0 ●● 61.5 ● ● 68.0 ●...

  • Page 12: Combination Ratio

    V6R VRF 50Hz 4 Combination Ratio Sum of capacity indexes of the indoor units Combination ratio = Capacity index of the outdoor units Table 1-4.1: Indoor and outdoor unit combination ratio limitations Allowed combination ratio Total Fresh air Type HT hydro combination ratio VRF indoor units module...
  • Page 13 V6R VRF 50Hz Table 1-4.2: Combinations of indoor and outdoor units Maximum Outdoor unit capacity Sum of capacity indexes number of connected VRF indoor units VRF indoor units + indoor Capacity VRF indoor units VRF indoor units + HT hydro fresh air processing units index...
  • Page 14 V6R VRF 50Hz Part 2 Component Layout and Refrigerant Circuits 1 Layout of Functional Components ............14 2 Piping Diagrams ..................16 3 Refrigerant Flow Diagrams ..............19...
  • Page 15 V6R VRF 50Hz 1 Layout of Functional Components 8/10/12HP Figure 2-1.1: 8/10/12HP top view Legend 14 15 Parts name Inverter compressor Discharge temperature switch Plate heat exchanger Electronic expansion valve (EEVC) Stop valve (liquid side) Stop valve (high pressure gas side) Stop valve (low pressure gas side) Refrigerant charge solenoid valve(SVC) (customization option)
  • Page 16 V6R VRF 50Hz 14/16/18HP Figure 2-1.3: 14/16/18HP top view Legend Parts name Inverter compressor Discharge temperature switch Plate heat exchanger Electronic expansion valve (EEVC) Stop valve (liquid side) Stop valve (high pressure gas side) Stop valve (low pressure gas side) Electronic expansion valve (EEVA) High pressure sensor Hot gas bypass solenoid valve(SV7)
  • Page 17 V6R VRF 50Hz 2 Piping Diagrams Figure 2-2.1: 8HP/10HP/12HP piping diagram Legend Parts name Parts name Inverter compressor Compressor vapor injection valve ( SV8A) Discharge temperature switch Injection bypass solenoid valve(SV5) Plate heat exchanger FAN A Electronic expansion valve (EEVC) 4-way valve Stop valve (liquid side) Pressure relief valve (customization option)
  • Page 18 V6R VRF 50Hz Figure 2-2.2: 14HP/16HP/18HP piping diagram Legend Parts name Parts name Inverter compressor Refrigerant charge solenoid valve(SVC) (customization option) Discharge temperature switch Pressure relief valve (customization option) Plate heat exchanger 4-way valve Electronic expansion valve (EEVC) Injection bypass solenoid valve(SV5) Stop valve (liquid side) FAN A Stop valve (high pressure gas side)
  • Page 19 V6R VRF 50Hz 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 20 V6R VRF 50Hz 3 Refrigerant Flow Diagrams Cooling operation Figure 2-3.1: Refrigerant flow during cooling operation...
  • Page 21 V6R VRF 50Hz Main cooling operation Figure 2-3.2: Refrigerant flow during main cooling operation...
  • Page 22 V6R VRF 50Hz Heating operation Figure 2-3.3: Refrigerant flow during heating operation...
  • Page 23 V6R VRF 50Hz Main heating operation Figure 2-3.4: Refrigerant flow during main heating operation...
  • Page 24 V6R VRF 50Hz Oil return operation in cooling mode Figure 2-3.5: Refrigerant flow during oil return operation in cooling mode...
  • Page 25 V6R VRF 50Hz Oil return operation in heating mode and defrosting operation Figure 2-3.6: Refrigerant flow during oil return operation in heating mode and defrosting operation...

  • Page 26: Table Of Contents

    V6R VRF 50Hz Part 3 Control 1 General Control Scheme Flowchart ............26 2 Stop Operation ..................27 3 Standby Control ..................28 4 Startup Control ..................28 5 Normal Operation Control ..............31 6 Protection Control .................. 37 7 Special Control ..................41 8 Other Control ..................

  • Page 27: General Control Scheme Flowchart

    V6R VRF 50Hz 1 General Control Scheme Flowchart Sections 3-2 to 3-8 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 28: Stop Operation

    V6R 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 makes a 'stop with thermos-off' operation and an error code is 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 29: Standby Control

    V6R 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 discharge temperature. When the discharge temperature is above 45°C, the crankcase heater is off; when the discharge temperature is below 40°C, the crankcase heater turns on if one of the three conditions is matched: The first time powered on In defrost operation...
  • Page 30 V6R VRF 50Hz 4.3 Startup Control for Cooling Only/Main Cooling Operation Table 3-4.1: Component control during startup in cooling only/main cooling mode Startup control Wiring Before startup Component diagram STEP1 STEP2 STEP3 label 8-10HP 42Hz, 12- 22HP 51Hz, 24-34HP Initial step for 30S, then+8Hz×Nstep / 88HZ, 36-60HP Inverter INV1...
  • Page 31 V6R VRF 50Hz 4.4 Startup Control for Heating Only/Main Heating Operation Table 3-4.2: Component control during startup in heating only / main heating mode Startup control Wiring Before startup Component diagram STEP1 STEP2 STEP3 label Adjust according to Initial step for 30s, then+8Hz×Nstep / Inverter the high pressure INV1...

  • Page 32: Normal Operation Control

    V6R 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 Normal Simultaneous Component Normal Cooling Normal Heating diagram label Cooling / Heating PI control, High pressure protection, Low pressure protection, Discharge temperature protection, Inverter Over-current protection control, Inverter module temperature Inverter compressor A COMP(A)
  • Page 33 V6R VRF 50Hz Table 3-5.3: MS04-12 component control during normal operation Wiring Normal Simultaneous Component Normal Cooling Normal Heating diagram label Cooling / Heating Electronic expansion valve EEVA 0pls Superheat PI control Superheat PI control A(Subcooling) Solenoid valve (Cooling) SV(n)A SV(n)A and SV(n)B turn ON or OFF depending on the operation mode of the port.
  • Page 34 V6R VRF 50Hz Table 3-5.6: Electric ball valve turn ON or OFF depending on the operation mode of the port. Electric ball valve ODU mode IDU state EVBA EVBB EVBC Cooling Cooling Thermo OFF Cooling only 2950pls 0pls 2950pls Error or Stop Maintain current Maintain...
  • Page 35 V6R VRF 50Hz 5.3 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 ( ) indicate the rotation sequence.
  • Page 36 V6R VRF 50Hz 5.5 Electronic Expansion Valve Control EEVA control The positions of electronic expansion valves EEVA are controlled in steps from 0 (fully closed) to 2880 (fully open). When the outdoor unit heat exchanging is performed via the evaporator, this function is used to exert PI control on the electronic expansion valve EEVA so that the evaporator outlet superheated degree (SH) will become constant.
  • Page 37 V6R 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 Table 3-5.9: Outdoor fan speed steps Fan speed (rpm) Fan speed index 14-18HP Note 8-12HP FANA / FANB Stop operation Startup or defrosting control 150/0...

  • Page 38: Protection Control

    V6R 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 in cooling operation Normal operation 3.9MPa <...
  • Page 39 V6R VRF 50Hz Figure 3-6.4: Low pressure protection control in heating operation Normal operation < 0.07MPa 0.18MPa When P2 protection occurs 3 times in ≥ 60 minutes, the H5 error is displayed. When an H5 error occurs, a manual Low pressure protection, error code P2 is displayed system restart is required before the system can resume operation.
  • Page 40 V6R VRF 50Hz 6.5 Ambient temperature out of range protection control When the outdoor ambient temperature rises above 30.5°C heating mode is disabled to prevent the mechanical load on compressors becoming too high and to prevent low compression ratios which can result in insufficient compressor internal oil lubrication.
  • Page 41 V6R VRF 50Hz 6.7 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. This control is performed for each compressor. Figure 3-6.10: Wet compression protection control Normal operation DSH <...

  • Page 42: Special Control

    V6R VRF 50Hz 7 Special Control 7.1 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 43 V6R VRF 50Hz Table 3-7.2: Indoor unit component control during oil return operation in cooling only/main cooling mode Cooling indoor unit 2000P EEV 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...
  • Page 44 V6R VRF 50Hz 7.2 Defrosting Operation In order to recover heating capacity, the defrosting operation is conducted when the outdoor unit heat exchanger is performing as an evaporator. The defrosting operation is controlled according to outdoor ambient temperature, outdoor heat exchanger temperature, indoor heat exchanger temperature and outdoor units running time. When the outdoor unit is running in defrosting, the digital display on outdoor main PCB will display “df”.
  • Page 45 V6R VRF 50Hz Table 3-7.4: Indoor unit component control during defrosting operation Cooling indoor unit 2000P EEV 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 1200pls 300pls...
  • Page 46 V6R VRF 50Hz Switching action of three-module parallel system heat exchanger Figure 3-7.3: Switching action of three-module parallel system heat exchanger Condition E  Total defrosting control time has reached 5 minutes.  T3 >Target value for a certain time. Notes: This function is only available when the indoor units connected in V6R system are 2nd generation AC VRF indoor units (which will be released soon) or 2nd generation DC VRF indoor units produced after May 31st, 2020 only (The package of upgraded indoor units will add yellow label on both sides to distinguish...

  • Page 47: Other Control

    V6R VRF 50Hz 8 Other Control 8.1 Overload control Overload control is used to maintain comfort requirement (i.e. outlet air temperature) and keep proper system pressure. Figure 3-8.1: Overload control Normal operation Indoor unit operation ratio <105% Indoor unit operation ratio 130% ≥...
  • Page 48 V6R VRF 50Hz Recover refrigerant to indoor units and MS boxes In order to recover the refrigerant from the outdoor unit to indoor units, MS boxes and connection pipes, this pump-down operation is conducted as below and the LED display r002 in this control. Table 3-8.2: Recover refrigerant to indoor units and MS units Wiring Startup control...
  • Page 49 V6R 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 Disabled...
  • Page 50 V6R VRF 50Hz Figure 3-8.3: Case 1: Tsh=Tsc Mode change: Mode change: Mode change: Heating to cooling Heating to cooling Cooling to heating 2 ℃ Cooling ON Cooling ON Cooling ON 1 ℃ Heating satisfied 26 ℃ Cooling/Heating ON 1 ℃ Cooling satisfied 2 ℃...
  • Page 51 V6R VRF 50Hz 8.5 Low Noise Mode Low noise mode is used to decrease the noise produced by outdoor units. There are 3 kinds of low noise mode: night silent mode, silent mode and super silent mode. When low noise mode activating, both the fan step and compressor are limited. In order to maintain the reliability of V6R system, the lowest fan step for inverter module temperature protection is prior to low noise control.
  • Page 52 V6R VRF 50Hz Part 4 Field Settings 1 Outdoor Unit Field Settings ..............52 2 Mode Selection Box Field Settings ............55...
  • Page 53 V6R VRF 50Hz 1 Outdoor Unit Field Settings 1.1 PCB Switches and Switch Settings Figure 4-1.1: Outdoor unit main PCB switches ENC2 ENC1 S4 S9 ENC5 S13 S8 S6 S10 S12 ENC3 ENC4 Table 4-1.1: Outdoor unit main PCB switch settings Switch Setting Switch positions...
  • Page 54 V6R VRF 50Hz Table 4-1.1: Outdoor unit main PCB switch settings (continued) Switch Setting Switch positions Description Reserved Reserved S8-1 Start-up time is 12 minutes (default) Start-up time S8-2 Start-up time is 7 minutes Reserved Reserved S8-3 No auto dust-clean (default) Auto dust-clean Auto dust-clean No force commissioning (default)
  • Page 55 V6R VRF 50Hz 1.2 Modes Set on Main PCB 1.2.1 Night silent mode setting Night silent mode is activated X hours after the peak daytime temperature, and is deactivated after Y hours, where X and Y are as specified in Table 4-1.2. Table 4-1.2: Night silent time setting Switch Switch positions...
  • Page 56 V6R VRF 50Hz 2 Mode Selection Box Field Settings 2.1 MS01 Switches Settings Figure 4-2.1: MS01 PCB switches ENC1 SW1 SW2 SW3 SW4 Table 4-2.1: MS01 PCB switch settings Switch Setting Switch positions Description Refrigerant Refrigerant leakage function invalid (default) leakage S1-1 function setting...
  • Page 57 V6R VRF 50Hz 2.2 MS04-12 Switches Settings ENC2 SW1 SW2 SW3 SW4 Table 4-2.1: MS04-12 PCB switch settings Switch Setting Switch positions Description No synchronous control for 2 ports (default) synchronous control setting synchronous control for 2 ports (First PCB is port 1 and 2, Second PCB is port 5 and 6, third PCB is port 9 and 10) No synchronous control for 2 ports (default) synchronous...
  • Page 58 V6R VRF 50Hz Part 5 Electrical Components and Wiring Diagrams 1 Outdoor Unit Electric Control Box Layout ..........58 2 Outdoor Unit Main PCB ................60 3 Data Transfer Module ................68 4 Compressor Inverter Module ..............70 5 Fan Module ....................74 6 Mode Selection Box Main PCB..............

  • Page 59: Outdoor Unit Electric Control Box Layout

    V6R VRF 50Hz 1 Outdoor Unit Electric Control Box Layout 8-12HP Figure 5-1.1: 8-12HP top layer of electric control box Filter board Main PCB Inductor Communication terminals block Power supply terminals Figure 5-1.2: 8-12HP bottom layer of electric control box Inverter module Reactor Fan module...
  • Page 60 V6R VRF 50Hz 14-18HP Figure 5-1.3: 14-18HP top layer of electric control box Main PCB Filter board Inductor Communication terminals block Power supply terminals Figure 5-1.4: 14-18HP bottom layer of electric control box Inverter module Reactor Fan module Fan module...

  • Page 61: Outdoor Unit Main Pcb

    V6R VRF 50Hz 2 Outdoor Unit Main PCB 2.1 Ports Figure 5-2.1: Outdoor unit main PCB ports Notes: Label descriptions are given in Table 5-2.1.
  • Page 62 V6R VRF 50Hz Table 5-2.1: Main PCB port Label in Figure Port code Content Port voltage 5-2.1 CN70 EXVA drive port 0V or 12V DC CN72 EXVC drive port 0V or 12V DC Reserved 12V DC CN82 Control port of relay for AC filter board 0V or 12V DC Heat exchanger gas temperature sensor(T8) connection, 0-5V DC (varying)
  • Page 63 V6R VRF 50Hz 2.2 Components Layout Figure 5-2.2: Outdoor unit main PCB components Dial switches Dial switches Digital display Buttons Main control chip 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 64 V6R VRF 50Hz 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 65 V6R VRF 50Hz Menu mode function: Table 5-2.3: Menu mode function Digital display Menu mode Remarks content Test operation Only available for the master unit Cooling test Only available for the master unit (all indoor units running in cooling mode) Only available for the master unit (all the indoor units will run in heating mode.
  • Page 66 V6R VRF 50Hz Table 5-2.3: Menu mode function (continued) Only available for master unit (Tc target temperature during heating operation, Automatic Low locking capacity (Tcs0=42) control) Medium-to-low locking capacity Only available for master unit (Tc target temperature during heating operation, Locking) (Tcs0=44) Medium locking capacity (Tcs0=46) Only available for master unit (Tc target temperature during heating operation, Locking)
  • Page 67 V6R VRF 50Hz Table 5-2.5: System check DSP content Parameters displayed on DSP2 Remarks ---- Standby (ODU address + IDU Qty.)/frequency/particular state 0.-- Unit address Master unit: 0; slave units: 1, 2 1.-- Single module capacity 8-18HP 2.-- Number of outdoor units Displayed on master unit PCB only 3.-- Number of indoor units as set on PCB...
  • Page 68 V6R VRF 50Hz Digital display output Table 5-2.6: Digital display output in different operating states Outdoor unit state Parameters displayed on DSP1 Parameters displayed on DSP2 DSP1 The number of indoor units in Standby Unit's address communication with the outdoor units Normal For single Running speed of the compressor in...

  • Page 69: Data Transfer Module

    V6R VRF 50Hz 3 Data Transfer Module 3.1 Layout Data Transfer Module is an additional auxiliary small PCB installed on the side columns of the outdoor unit, this design greatly helps the installer or service man to set Auto-commissioning or CHECK the operation status without removing the front panel.
  • Page 70 V6R VRF 50Hz Sync information from main PCB digital display The digital display on data transfer module displays the same information as the digital display on main PCB. Auto snow-blowing setting SW5 / S11: enter/exit auto snow-blowing mode (only available for the outdoor unit which has been customized auto-blowing function) Mode Remark...

  • Page 71: Compressor Inverter Module

    V6R VRF 50Hz 4 Compressor Inverter Module 4.1 Ports 8-12HP Figure 5-4.1: 8-12HP compressor inverter module ports Notes: Label descriptions are given in Table 5-4.1.
  • Page 72 V6R VRF 50Hz Table 5-4.1: 8-12HP compressor inverter module ports Label in Code Content Port voltage Figure 5-4.1 P-in connect to reactor 560V DC between P and N; CN16 Three phase power input of L1 380V AC between L1/L2 and L3; P-out connect to reactor 560V DC between P and N;...
  • Page 73 V6R VRF 50Hz 14-18HP Figure 5-4.2: 14-18HP compressor inverter module ports Notes: Label descriptions are given in Table 5-4.2.
  • Page 74 V6R VRF 50Hz Table 5-4.2: 14-18HP compressor inverter module ports Label in Code Content Port voltage Figure 5-3.1 P-in connect to reactor 560V DC between P and N; CN16 Three phase power input of L1 380V AC between L1/L2 and L3; P-out connect to reactor 560V DC between P and N;...

  • Page 75: Fan Module

    V6R VRF 50Hz 5 Fan Module Figure 5-5.1: Fan module ports ① ② ③ ⑧ ④ ⑦ ⑤ ⑥ Notes: Label descriptions are given in Table 5-5.1. Table 5-5.1: Fan module ports Label in Code Content Port voltage Figure 5-4.1 Power input of DC fan drive board 18V-22V DC Power input of DC fan drive board...

  • Page 76: Mode Selection Box Main Pcb

    V6R VRF 50Hz 6 Mode Selection Box Main PCB 6.1 Ports MS01 Figure 5-6.1: MS01 main PCB ports Notes: Label descriptions are given in Table 5-6.1 Table 5-6.1: MS01 main PCB ports Label in Code Content Port voltage Figure 5-5.1 CN24 Temperature sensor(T1C1,T2C2) connection 5VDC...
  • Page 77 V6R VRF 50Hz MS04-12 Figure 5-6.1: MS04-12 main PCB ports Notes: Label descriptions are given in Table 5-6.2 Table 5-6.2: MS04-12 main PCB ports Label in Code Content Port voltage Figure 5-5.2 CN24 Temperature sensor(T1C1,T2C2) connection 5VDC CN18 Electric expansion valve A connection 12VDC CN20 Program port...
  • Page 78 V6R VRF 50Hz 6.2 Spot Check Press SW1 and SW2 on MS main PCB forward and backward to spot check the MS box data. After 1s shows the no., the display will automatically show the data. For example, to check the outdoor operation mode, press SW1/SW2 to show - -02, then stop and wait for 1s, and the display will show the number of the current outdoor operation mode.

  • Page 79: Wiring Diagrams

    V6R VRF 50Hz         7 Wiring Diagrams Figure 5‐7.1: V6R outdoor unit wiring diagram  T7C1 EEVC T8 TL L-YL1 O-FAN CN26 CN72 CN12 CN10 CN16 CN27 EEVA N-ON H-PRO L-PRO INV1 INV2 H-YL1 T4 T3 CN70 CN82 CN18 CN19 CN14 CN15 CN17 CN28  ...
  • Page 80 V6R VRF 50Hz       Figure 5‐7.2: MS01 wiring diagram   ...
  • Page 81 V6R VRF 50Hz         Figure 5‐7.3: MS04/MS06 wiring diagram       ...
  • Page 82 V6R VRF 50Hz       Figure 5‐7.4: MS08/MS10/MS12 wiring diagram   ...
  • Page 83 V6R VRF 50Hz...
  • Page 84 V6R VRF 50Hz Part 6 Diagnosis and Troubleshooting 1 Error Code Table ..................84 2 Troubleshooting for Outdoor Unit ............87 3 Troubleshooting for Mode Selection Box ........... 150 4 Appendix to Part 6 ................162...
  • Page 85 V6R VRF 50Hz 1 Error Code Table Table 6-1.1: Outdoor Error code table Manual re-start Error code Content Remarks required Only displayed on the slave unit with Communication error between outdoor units the error Only displayed on the master unit with Communication error between MS and master unit the error T3/T4 temperature sensor error...
  • Page 86 V6R VRF 50Hz Table 6-1.1: Error code table (continued) Manual re-start Error code Content Remarks required Emergency shutdown Refrigerant leakage protection There are other indoor unit connected except the 2 Only displayed on the master unit with generation DC IDU the error Only displayed on the master unit with The system is connected to AHU kit only.
  • Page 87 V6R VRF 50Hz Table 6-1.2: MS04-12 Error code table Manual re-start Error code Content Remarks required Communication failure between MS The indoor unit display board or wired controller and master outdoor unit connected under this MS displays "F8" fault code Malfunction of subcooler outlet The indoor unit display board or wired controller thermistor(T1C1)
  • Page 88 V6R VRF 50Hz 2 Troubleshooting for Outdoor Unit 2.1 Warning Warning  All electrical work must carried by competent and suitably qualified, certified accredited professionals and in accordance with all applicable legislation (all national, local and other laws, standards, codes, rules, regulations and other legislation that apply in a given situation). ...
  • Page 89 V6R VRF 50Hz Procedure ODU addresses on switch ENC1 are set Set the ODU addresses correctly incorrectly Ensure the communication wires are Communication wires between ODUs are two-core shielded cable and are not connected properly connected properly Wires between outdoor main PCB and electric control box communication Ensure the wires are connected properly terminals block are loose...
  • Page 90 V6R VRF 50Hz 2.3 E2: Communication error between MS box and master unit Digital display output Description  Communication error between MS box and master outdoor unit.  All units stop running.  Error code is only displayed on the master unit. Trigger / recover condition ...
  • Page 91 V6R VRF 50Hz Procedure Communication wires P Q have short Reconnect the communication wires circuited or disconnected Communication wires P Q are not Connect the communication wires in a connected in a daisy chain daisy chain MS box power supply is abnormal Ensure normal power supply Wires between outdoor main PCB and electric control box communication...
  • Page 92 V6R VRF 50Hz 2.4 E4: T3/T4 Temperature sensor error Digital display output Description  Heat exchanger deicer temperature sensor (T3) error or outdoor air temperature sensor (T4) error.  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition ...
  • Page 93 V6R VRF 50Hz 2.5 E5: Abnormal power supply voltage Digital display output Description  Abnormal power supply voltage.  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition  Trigger condition: Outdoor unit power supply phase voltage < 170V or ≥ 270V. ...
  • Page 94 V6R VRF 50Hz Procedure ODU power supply is abnormal or a Provide normal power supply phase is missing Wires between outdoor main PCB, AC filter boards and electric control box Ensure the wires are connected properly power supply terminals are loose High voltage circuit error has occurred, such as the compressor has malfunction Replace or repair the relevant parts...
  • Page 95 V6R VRF 50Hz 2.6 E7: Discharge Temperature sensor error (T7C1) Digital display output Description  A compressor top temperature sensor or discharge pipe temperature sensor (T7C1) error.  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition ...
  • Page 96 V6R VRF 50Hz 2.7 E8: Outdoor unit address error Digital display output Description  Outdoor unit address error.  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition  Trigger condition: Outdoor unit address is set more than 2. ...
  • Page 97 V6R VRF 50Hz 2.8 E9: EEPROM mismatch of compressor Digital display output Description  EEPROM mismatch of compressor.  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition  Trigger condition: Compressor drive parameter is mismatch. ...
  • Page 98 V6R VRF 50Hz 2.9 F1: DC bus voltage error Digital display output Description  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition  Trigger condition: DC bus voltage < 300V or DC bus voltage >800V continuously for 10 seconds. ...
  • Page 99 V6R VRF 50Hz 2.10 F3, F5, F9, FA, Fb, Fc, Fd: T6B/T6A/T5/T8/T9/TL/T7 Temperature sensor error Digital display output Description  F3 indicates subcooling gas temperature sensor (T6B) error.  F5 indicates injection liquid temperature sensor (T6A) error.  F9 indicates liquid pipe temperature sensor (T5) error. ...
  • Page 100 V6R VRF 50Hz Procedure F3/F5/F9/FA/Fb/FC/Fd Temperature sensor connection on Ensure the sensor is connected properly outdoor main PCB is loose Temperature sensor has short-circuited Replace the sensor or failed Replace the outdoor main PCB Notes: Injection liquid temperature sensor (T6A) and subcooling gas temperature sensor (T6B) connection are port CN8 and CN6 on the outdoor main PCB. Liquid pipe temperature sensor (T5) and Heat sink Temperature sensor (T9) error connection are port CN12 and CN14 on the outdoor main PCB.
  • Page 101 V6R VRF 50Hz 2.11 zF6: Electronic expansion valve connection error Digital display output Description  1F6 indicates Electronic expansion valve A connection error.  2F6 indicates Electronic expansion valve C connection error.  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition ...
  • Page 102 V6R VRF 50Hz Procedure Electronic expansion valve coil connection on outdoor main PCB is Ensure the sensor is connected properly loose Electronic expansion valve coil has Replace the coil. malfunction Replace the outdoor main PCB Notes: Electronic expansion valve coil connections are port CN70 and CN72 on the outdoor main PCB The normal resistances between EEV coil wiring terminals RED and white / yellow / orange / blue are 40-50Ω.
  • Page 103 V6R VRF 50Hz 2.12 H0: Communication error between main board and compressor drive board Digital display output Description  H0 indicates a communication error between main board and compressor drive board.  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition ...
  • Page 104 V6R VRF 50Hz Procedure Communication wire from outdoor main PCB CN26 to inverter module CN8/CN9 is Reconnect the communication wire. loosened. Both LED1 and LED2 on inverter module Check the power supply circuit. are off when power on. Replace the outdoor main PCB, is the Normal.
  • Page 105 V6R VRF 50Hz 2.13 H2, H3: Qty. of outdoor unit decreases/ increases error Digital display output Description  H2 indicates Qty. of outdoor unit decreases error.  H3 indicates Qty. of outdoor unit increases error.  All units stop running. ...
  • Page 106 V6R VRF 50Hz Procedure H2 / H3 Some outdoor units in the system are Power on all the outdoor units powered off The power supply is abnormal Check the power supply equipment Troubleshoot as for an E0 error Notes: Refer to “E0 Troubleshooting”.
  • Page 107 V6R VRF 50Hz 2.14 H4: Compressor inverter module protection Digital display output Description  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition  Trigger condition: Compressor appears three inverter module protections. ...
  • Page 108 V6R VRF 50Hz The specific error codes L0, L1, L2, L5, L7 and LA can also be obtained from the inverter module LED indicators. If an inverter module error has occurred, LED2(green) is continuously on and LED1(red) flashes. Figure 6-2.4: 8-12HP LED indicators LED1 and LED2 on inverter module LED2 LED1 Figure 6-2.5: 14-18HP LED indicators LED1 and LED2 on inverter module...
  • Page 109 V6R VRF 50Hz L0: Inverter module protection L0 Fault L0 Protection Check whether the compressor wiring is Reconnect the cables based properly connected. on wiring diagram Disconnect the Measure whether resistance between 3 power supply phases of compressor is below 5Ω. Replace the compressor Measure the insulation resistance of compressor.
  • Page 110 V6R VRF 50Hz L1: DC bus low voltage protection L1 protection Check the power supply The power supply is abnormal equipment No output from bridge rectifier Replace the The DC bus voltage (P, N) is abnormal The reactor performs well reactor Replace the inverter module Note:...
  • Page 111 V6R VRF 50Hz L2: DC bus high voltage protection L2 protection Check the power supply The power supply is abnormal equipment Replace the 3-phase bridge The DC bus voltage (P, N) is abnormal rectifier Replace the inverter module Note: The normal DC voltage between terminals P and N on inverter module should be 450-650V. When the voltage is higher than 700V, L2 protection will be appeared.
  • Page 112 V6R VRF 50Hz L5: Zero speed protection L5 Fault L5 Protection There is abnormal noise of compressor Replace the compressor when startup or running Disconnect the power supply Replace the inverter module...
  • Page 113 V6R VRF 50Hz L7: Phase sequence error L7 protection Reconnect cables based on Compressor wiring is loose wiring diagram Disconnect the An open circuit in the 3-phase U/V/W power supply Replace the compressor of compressor terminals Replace the inverter module...
  • Page 114 V6R VRF 50Hz LA: PED software verification failed LA Fault LA Protection Short circuit high pressure sensor High pressure sensor has short- Disconnect the connection on the inverter module, the circuited or failed, replace the power supply error code “LA” disappeared sensor Replace the inverter module Notes...
  • Page 115 V6R VRF 50Hz Compressor replacement procedure Figure 6-2.8: Draining oil from a compressor Step 1: Remove faulty compressor and remove oil  Remove the faulty compressor from the outdoor unit.  Before removing the oil, shake the compressor so as to not allow impurities to remain settled at the bottom.
  • Page 116 V6R VRF 50Hz       Step 8: Vacuum drying and refrigerant charging  Once  all  the  compressors  and  other  components  have  been  fully  connected,  vacuum  dry  the  system  and  recharge  refrigerant. Refer to the V6R Engineering Data Book, Part 3.      Figure 6-2.10: Inspecting compressor oil   This oil is a little ...
  • Page 117 V6R VRF 50Hz Figure 6-2.11: Effects of spoiled compressor oil Worn crankshaft Worn scroll plate Worn scroll plate Normal compressor bearings Seriously worn and damaged bearings Filter blocked by impurities, which leads to abnormal compressor suction...
  • Page 118 V6R VRF 50Hz 2.15 H7: Qty. of indoor units mismatching Digital display output Description  Number of indoor units detected by master unit not same as number set on outdoor main PCB.  All units stop running.  Error code is only displayed on the master unit. Trigger / recover condition ...
  • Page 119 V6R VRF 50Hz Procedure Number of indoor units set on outdoor Change the setting on the PCB to be the main PCB not same as actual number of same as the actual number of indoor indoor units units Some indoor units are powered off Power on all indoor units After re-starting the ODUs and IDUs and Refer to indoor unit troubleshooting...
  • Page 120 V6R VRF 50Hz 2.16 H8: High pressure sensor error Digital display output Description  High pressure sensor error.  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition  Trigger condition: Discharge pressure ≤ 0.3MPa and T4 ≥ -10℃ for a consecutive of 20s or Discharge pressure ≤...
  • Page 121 V6R VRF 50Hz Procedure ODU stop valves are closed Open the stop valves High pressure sensor connection on Ensure the sensor is connected properly outdoor main PCB is loose High pressure sensor has short-circuited Replace the sensor or failed Insufficient refrigerant caused by Add refrigerant and inspect system for refrigerant leakage leaks...
  • Page 122 V6R VRF 50Hz 2.17 Hb: Low pressure sensor error Digital display output Description  Low pressure sensor error.  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition  Trigger condition: The main control board cannot receive the feedback signal of low pressure sensor. ...
  • Page 123 V6R VRF 50Hz Procedure ODU stop valves are closed Open the stop valves Low pressure sensor connection on Ensure the sensor is connected properly outdoor main PCB is loose Low pressure sensor has failed Replace the sensor Replace the outdoor main PCB Notes: High pressure sensor connection is port CN17 on the outdoor main PCB.
  • Page 124 V6R VRF 50Hz 2.18 yHd: Slave unit malfunction Digital display output In the error code, 'y' is a placeholder for the address (1, 2) of the slave unit with the error. Description  1Hd indicates an error on the slave unit with address 1. ...
  • Page 125 V6R VRF 50Hz 2.19 P1: High pressure protection Digital display output Description  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition  High pressure sensor protection  Trigger condition: Discharge pressure ≥ 3.9 MPa. ...
  • Page 126 V6R VRF 50Hz Procedure ODU stop valves are closed Open the stop valves High pressure sensor connection on Ensure the sensor is connected properly outdoor main PCB is loose High pressure sensor has short-circuited Replace the sensor or failed Discharge part of the refrigerant. Add oil Excess refrigerant if it leaks during discharge Flush all refrigerant then vacuum the...
  • Page 127 V6R VRF 50Hz 2.20 P2, H5: Suction pipe low pressure protection Description  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition  Trigger condition: For P2 protection: Suction pressure < 0.07MPa. For H5 protection: P2 protection appears three times in 60 minutes.
  • Page 128 V6R VRF 50Hz Procedure P2 / H5 ODU stop valves are closed Open the stop valves Insufficient refrigerant caused by Add refrigerant or inspect the system for refrigerant leakage leaks The low pressure side is blocked, caused Inspect the system and fix the error. If the by crushed or bent pipe, blocked EEV, or filter is blocked by ice, the piping should dirty filter...
  • Page 129 V6R VRF 50Hz 2.21 P31: Primary current protection Digital display output Description  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition  Trigger condition: Refer to Part 3 6.4 Over-current Protection Control ...
  • Page 130 V6R VRF 50Hz … flowchart continued from previous page Discharge part of the refrigerant. Add oil Excess refrigerant if it leaks during discharge Flush all refrigerant then vacuum the System contains air or nitrogen system and recharge refrigerant. Add oil to the system if it leaks The condenser heat exchange is poor Inspect the system and fix the error...
  • Page 131 V6R VRF 50Hz 2.22 P32: Secondary current protection Digital display output Description  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition  Trigger condition: Refer to Part 3 6.4 Over-current Protection Control ...
  • Page 132 V6R VRF 50Hz … flowchart continued from previous page Discharge part of the refrigerant. Add oil Excess refrigerant if it leaks during discharge Flush all refrigerant then vacuum the System contains air or nitrogen system and recharge refrigerant. Add oil to the system if it leaks The condenser heat exchange is poor Inspect the system and fix the error...
  • Page 133 V6R VRF 50Hz 2.23 P4, H6: Discharge temperature protection or discharge temperature switch protection Digital display output Description  Discharge temperature protection.  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition ...
  • Page 134 V6R VRF 50Hz Procedure P4 / H6 ODU stop valves are closed Open the stop valves Compressor top temperature sensor, discharge pipe temperature sensor Ensure the sensors and switch are and/or discharge temperature switch connected properly connections on outdoor main PCB are loose Compressor top temperature sensor and/or discharge pipe temperature...
  • Page 135 V6R VRF 50Hz characteristics table, the sensor has failed. Refer to Table 6-4.2 in Part 6, 4.1 “Temperature Sensor Resistance Characteristics “. An insufficiency of refrigerant causes compressor discharge temperature to be higher than normal, discharge and suction pressures to be lower than normal and compressor current to be lower than normal, and may cause frosting to occur on the suction pipe.
  • Page 136 V6R VRF 50Hz 2.24 P9, H9: Fan module protection Digital display output Description  Fan module protection.  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition  Trigger condition: For P9 protection: Fan speed is too low.
  • Page 137 V6R VRF 50Hz Procedure P9 / H9 The capacity set on switch ENC2 on the Ensure the setting on switch ENC2 outdoor main PCB and the capacity given matches the unit capacity given on the on the unit’s nameplate do not match unit’s nameplate Some power wires or communication Ensure power and communication wires...
  • Page 138 V6R VRF 50Hz 2.25 PL, C7: Inverter module temperature protection Digital display output Description  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition  Trigger condition: For PL protection: Refer to Part 3 6.5 Inverter Module Temperature Protection Control For C7 protection: PL protection appears three times in 100 minutes.
  • Page 139 V6R VRF 50Hz 2.26 PP: Compressor discharge insufficient superheat protection Digital display output Description  Compressor discharge insufficient superheat protection.  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition ...
  • Page 140 V6R VRF 50Hz Procedure Compressor discharge pipe temperature Ensure the sensor are connected sensor does not be properly connected properly to outdoor main PCB. Compressor discharge pipe temperature Replace the faulty sensor sensor have short circuited or failed High pressure sensor connection on Ensure the sensor is connected properly outdoor main PCB is loose High pressure sensor has short-circuited...
  • Page 141 V6R VRF 50Hz 2.27 A0: Emergency shutdown Digital display output Description  Compressor discharge insufficient superheat protection.  All units stop running.  Error code is only displayed on the master unit. Trigger / recover condition  Trigger condition: The port of CN91 on the outdoor main PCB has short-circuited； Received the emergency shutdown instructions from centralized controller.
  • Page 142 V6R VRF 50Hz Procedure The port of CN91 on the outdoor main Replace the outdoor main PCB PCB has short-circuited Received the emergency shutdown Cancel the emergency shutdown instructions from centralized controller instructions Replace centralized controller...
  • Page 143 V6R VRF 50Hz 2.28 A1w: Refrigerant leakage protection Digital display output Description  Refrigerant leakage protection.  All units stop running.  Error code is displayed on the unit with the error. Trigger / recover condition  Trigger condition: If any MS reports refrigerant leak failure A1, the failure is sent to the ODU. Menu Settings Error Code Description...
  • Page 144 V6R VRF 50Hz 2.29 CA1, CA2, CA3, CA4, CA5: Connection combination error Digital display output Description  Connection combination error.  All units stop running.  Error code is only displayed on the master unit. Trigger / recover condition  Trigger condition: The types of inside equipment that can be connected to the V6R series heat recovery outdoor unit include: •...
  • Page 145 V6R VRF 50Hz 2.30 CB1, CB2, CB3, CB4: Overmatch protection Digital display output Description  CB1: VRF indoor exceeds the match range (the highest priority)  CB2: AHU kit exceeds the match range (second highest priority)  CB3: HT exceeds the match range (third highest priority) ...
  • Page 146 V6R VRF 50Hz 2.31 U0: Force cooling operation not performed Digital display output Description  Forced cooling operation is set by switch S10 but it not performed in 30 minutes after power-on.  All units stop running.  Error code is only displayed on the master unit. Trigger / recover condition ...
  • Page 147 V6R VRF 50Hz 2.32 U21, U22, U23: Ambient temperature is out range of test operation. Digital display output Description  Ambient temperature is out range of test operation.  All units stop running.  Error code is only displayed on the master unit. Trigger / recover condition ...
  • Page 148 V6R VRF 50Hz Possible causes  Temperature is out of range. Procedure U21, U22, U23 After selecting n15 for forced heating operation in the menu for a period of time (increasing the inside temperature), enter the self-test again.
  • Page 149 V6R VRF 50Hz 2.33 U31, U32, U33: Stop valve is not open. Digital display output Description  U31: Liquid side stop valve is not opened.  U32: High pressure gas side stop valve is not opened.  U33: Low pressure gas side stop valve is not opened. ...
  • Page 150 V6R VRF 50Hz 2.34 U4: Indoor unit refrigerant pipe and signal cable connection are inconsistent Digital display output Description  Indoor unit refrigerant pipe and signal cable connection are inconsistent.  All units stop running.  Error code is only displayed on the master unit. Trigger / recover condition ...
  • Page 151 V6R VRF 50Hz 3 Troubleshooting for Mode Selection Box 3.1 Warning Warning  All electrical work must carried by competent and suitably qualified, certified accredited professionals and in accordance with all applicable legislation (all national, local and other laws, standards, codes, rules, regulations and other legislation that apply in a given situation). ...
  • Page 152 V6R VRF 50Hz Procedure Communication wires P Q have short Reconnect the communication wires circuited or disconnected Wires between outdoor and MS Ensure the wires are connected properly communication terminals block are loose The sequence of the PQE signal lines is Reverse the sequence of signal lines.
  • Page 153 V6R VRF 50Hz 3.3 E3/E4: T1C1/T2C2 Temperature sensor error Digital display output Description  E3 indicates malfunction of subcooler outlet temperature sensor (T1C1).  E4 indicates malfunction of subcooler outlet temperature sensor (T2C2).  All units stop running.  Error code is displayed on the malfunction MS box. ...
  • Page 154 V6R VRF 50Hz 3.4 E7: EEPROM error Digital display output Description  EEPROM error.  All units stop running.  Error code is displayed on the malfunction MS box.  The indoor unit display board or wired controller connected to this MS displays "F8”. Trigger / recover condition ...
  • Page 155 V6R VRF 50Hz 3.5 FE: MS has no address when first powered on Digital display output Description  MS has no address when first powered on.  All units stop running.  Error code is displayed on the malfunction MS box. ...
  • Page 156 V6R VRF 50Hz 3.6 LL: S1+S2 dialing setting error (for MS04-12) Digital display output Description  S1+S2 dialing setting error.  All units stop running.  Error code is displayed on the malfunction MS box.  The indoor unit display board or wired controller connected to this MS displays "F8”. Trigger / recover condition ...
  • Page 157 V6R VRF 50Hz 3.7 H0: Communication between master and slave control boards failed (for MS04-12) Digital display output Description  H0 indicates a communication error between master and slave MS PCB.  All units stop running.  Error code is displayed on the malfunction MS box. Trigger / recover condition ...
  • Page 158 V6R VRF 50Hz 3.8 F6: Electronic ball valve connection failure (for MS01) Digital display output Description  Electronic ball valve (EBVA/EBVB/EBVC) connection failure.  All units stop running.  Error code is displayed on the unit with the error. The indoor unit display board or wired controller connected under this MS displays "F8"...
  • Page 159 V6R VRF 50Hz Procedure Electronic expansion valve coil Ensure the valve coil is connected connection on MS main PCB is loose. properly Electronic ball valve coil has Replace the coil. malfunction Replace the MS main PCB Notes: The normal resistances between EBV coil wiring terminals Gray (common port) and Blake / Yellow / Red / Orange are 40-50Ω. If any of the resistances differ from the value, the EBV coil has malfunction.
  • Page 160 V6R VRF 50Hz 3.9 F7: Main power off (for MS01) Digital display output Description  Main power off.  All units stop running.  Error code is displayed on the malfunction MS box.  The indoor unit display board or wired controller connected to this MS displays "F8”. Trigger / recover condition ...
  • Page 161 V6R VRF 50Hz 3.10 F9: Overload error (for MS01) Digital display output Description  Overload error.  All units stop running.  Error code is displayed on the malfunction MS box.  The indoor unit display board or wired controller connected to this MS displays "F8”. Trigger / recover condition ...
  • Page 162 V6R VRF 50Hz 3.11 A1: Refrigerant leakage protection (for MS01) Digital display output Description  Refrigerant leakage protection.  All units stop running.  Error code is displayed on the malfunction MS box. Trigger / recover condition  Trigger condition: Communication between main control board and inverter driver board is abnormal for 2 minutes. ...
  • Page 163 V6R VRF 50Hz 4 Appendix to Part 6 4.1 Temperature Sensor Resistance Characteristics Table 6-4.1: Temperature sensor resistance characteristics Temp. Temp. Resistance Voltage Temp. Temp. Resistance Voltage Temp. Temp. Resistance Voltage (°C) (°F) (KΩ) (°C) (°F) (KΩ) (°C) (°F) (KΩ) -38.2 387.13 0.1020...
  • Page 164 V6R VRF 50Hz Table 6-4.2: Compressor discharge pipe temperature sensor (T1C1) resistance characteristics Temp. Temp. Resistance Voltage Temp. Temp. Resistance Voltage Temp. Temp. Resistance Voltage (°C) (°F) (KΩ) (°C) (°F) (KΩ) (°C) (°F) (KΩ) 542.7 0.0732 89.6 40.57 0.8287 183.2 6.033 2.8596 -2.2...
  • Page 165 V6R VRF 50Hz 4.2 Pressure Sensor Voltage Characteristics Table 6-4.3: Low pressure sensor resistance characteristics Low pressure Low pressure Resistance Output Low pressure Low pressure Resistance Output (MPa) (psi) (KΩ) voltage(V) (MPa) (psi) (KΩ) voltage(V) 14.5 49.51142857 0.68 98.6 13.60666667 1.86 0.11 47.91222222...
  • Page 166 V6R VRF 50Hz 4.3 Parameters of Excess and Insufficient Refrigerant System Under the following conditions, the operating parameters given in Tables 6-4.4 and 6-4.5 should be observed:  The master outdoor unit can detect all the indoor units.  The number of indoor units displayed on DSP2 is steady and is equal to the actual number of indoor units installed. ...
  • Page 167 Ver. 2020-04 Commercial Air Conditioner Division Midea Group Add.: Midea Headquarters Building, 6 Midea Avenue, Shunde, Foshan, Guangdong, China Postal code: 528311 cac.midea.com / global.midea.com Note: Product specifications change from time to time as product improvements and developments are released and may vary from those in this...

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