Midea MV5-X252W/V2GN1 Service Manual
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Midea MV5-X252W/V2GN1 Service Manual

Commercial air conditioners
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MV5-X252W/V2GN1
MV5-X280W/V2GN1
MV5-X335W/V2GN1
MV5-X400W/V2GN1
Commercial Air Conditioners
MV5-X450W/V2GN1
MV5-X500W/V2GN1
MV5-X560W/V2GN1
MV5-X615W/V2GN1
R410A

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Summary of Contents for Midea MV5-X252W/V2GN1

  • Page 1 R410A Commercial Air Conditioners Service Manual MV5-X252W/V2GN1 MV5-X450W/V2GN1 MV5-X280W/V2GN1 MV5-X500W/V2GN1 MV5-X335W/V2GN1 MV5-X560W/V2GN1 MV5-X400W/V2GN1 MV5-X615W/V2GN1...
  • Page 2 V5 X VRF 50/60Hz CONTENTS Part 1 General Information ................3 Part 2 Component Layout and Refrigerant Circuits ........11 Part 3 Control ....................21 Part 4 Field Settings ..................35 Part 5 Diagnosis and Troubleshooting ............41 201608...
  • Page 3 V5 X VRF 50/60Hz 201608...
  • Page 4 V5 X VRF 50/60Hz Part 1 General Information Indoor and Outdoor Unit Capacities ............4 External Appearance................6 Outdoor Unit Combinations ..............8 Combination Ratio ................. 9 201608...

  • Page 5: Indoor And Outdoor Unit Capacities

    V5 X VRF 50/60Hz 1 Indoor and Outdoor Unit Capacities 1.1 Indoor Units 1.1.1 Standard indoor units Table 1-1.1: Standard indoor unit abbreviation codes Abbreviation Abbreviation Type Type code code One-way Cassette High Static Pressure Duct Two-way Cassette Wall-mounted Q4-C Compact Four-way Cassette Ceiling &...
  • Page 6 V5 X VRF 50/60Hz 1.3 Outdoor Units Table 1-1.5: Outdoor unit capacity range Capacity 10HP 12HP 14HP 16HP 18HP 20HP 22HP Model X252W X280W X335W X400W X450W X500W X560W X615W (MV5-*/V2GN1) Capacity 24HP 26HP 28HP 30HP 32HP 34HP 36HP 38HP Model X670W X730W...

  • Page 7: External Appearance

    V5 X VRF 50/60Hz 2 External Appearance 2.1 Indoor Units 2.1.1 Standard indoor units Table 1-2.1: Standard indoor unit appearance One-way Cassette Two-way Cassette Compact Four-way Cassette Four-way Cassette Q4-C Low Static Pressure Duct Medium Static Pressure Duct High Static Pressure Duct Wall-mounted Ceiling &...
  • Page 8 V5 X VRF 50/60Hz 2.2 Heat Recovery Ventilator Table 1-2.3: Heat recovery ventilator appearance Heat Recovery Ventilator 2.3 Outdoor Units 2.3.1 Single units Table 1-2.4: Single outdoor unit appearance 8/10/12HP 14/16/18/20/22HP 2.3.2 Combinations of units Table 1-2.5: Combination outdoor unit appearance 24HP 26/28/30/32/34HP 36/38/40/42/44HP...

  • Page 9: Outdoor Unit Combinations

    V5 X VRF 50/60Hz 3 Outdoor Unit Combinations Table 1-3.1: Outdoor unit combinations System capacity Modules Number Outdoor branch joint kit of units 25.2 ● 28.0 ● 33.5 ● 40.0 ● — 45.0 ● 50.0 ● 56.0 ● 61.5 ● 67.0 ●●...

  • Page 10: Combination Ratio

    V5 X VRF 50/60Hz 4 Combination Ratio Sum of capacity indexes of the indoor units Combination ratio = Capacity index of the outdoor units Table 1-4.1: Indoor and outdoor unit combination ratio limitations Maximum combination ratio Minimum Type Standard indoor Fresh air processing Fresh air processing units and combination ratio...
  • Page 11 V5 X VRF 50/60Hz 201608...
  • Page 12 V5 X VRF 50/60Hz Part 2 Component Layout and Refrigerant Circuits Layout of Functional Components ............12 Piping Diagrams .................. 14 Refrigerant Flow Diagrams ..............16 201608...
  • Page 13 V5 X VRF 50/60Hz 1 Layout of Functional Components MV5-X252W/V2GN1 / MV5-X280W/V2GN1 / MV5-X335W/V2GN1 Figure 2-2.1: MV5-X252(280, 335)W/V2GN1 top view High pressure sensor Discharge temperature switch Compressor top temperature sensor Figure 2-2.2: MV5-X252(280, 335)W/V2GN1 front view Solenoid valve SV5 DC fan motor...
  • Page 14 V5 X VRF 50/60Hz MV5-X400W/V2GN1 MV5-X450W/V2GN1 MV5-X500W/V2GN1/ MV5-X560W/V2GN1 MV5-X615W/V2GN1 Figure 2-2.3: MV5-X400(450, 500, 560, 615)W/V2GN1 top view Discharge temperature switch Discharge temperature switch Compressor top Compressor top temperature sensor temperature sensor Figure 2-2.4: MV5-X400(450, 500, 560, 615)W/V2GN1 front view Solenoid valve SV5 (fast defrosting) DC fan motor DC fan motor...
  • Page 15 V5 X VRF 50/60Hz 2 Piping Diagrams MV5-X252W/V2GN1 / MV5-X280W/V2GN1 / MV5-X335W/V2GN1 Figure 2-1.1: MV5-X252(280, 335)W/V2GN1 piping diagram Solenoid 1-way valve valve SV6 Heat exchanger Filter Liquid pipe Electronic expansion valve Filter Stop valve Four-way valve Gas pipe Stop valve...
  • Page 16 V5 X VRF 50/60Hz Key components: 1. Oil separator: Separates oil from gas refrigerant pumped out of the compressor and quickly returns it to the compressor. Separation efficiency is up to 99%. 2. Accumulator: Stores liquid refrigerant and oil to protect compressor from liquid hammering. 3.
  • Page 17 V5 X VRF 50/60Hz 3 Refrigerant Flow Diagrams MV5-X252W/V2GN1 / MV5-X280W/V2GN1 / MV5-X335W/V2GN1 Cooling operation Figure 2-3.1: MV5-X252(280, 335)W/V2GN1 refrigerant flow during cooling operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure Solenoid 1-way valve...
  • Page 18 V5 X VRF 50/60Hz Oil return operation in heating mode and defrosting operation Figure 2-3.3: MV5-X252(280, 335)W/V2GN1 refrigerant flow during oil return operation in heating mode and during defrosting operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure 1-way valve Heat exchanger...
  • Page 19 V5 X VRF 50/60Hz MV5-X400W/V2GN1 / MV5-X450W/V2GN1 / MV5-X500W/V2GN1/ MV5-X560W/V2GN1 / MV5-X615W/V2GN1 Cooling operation Figure 2-3.5: MV5-X400(450, 500, 560, 615)W/V2GN1 refrigerant flow during cooling operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure 1-way Solenoid valve valve SV6...
  • Page 20 V5 X VRF 50/60Hz Oil return operation in heating mode and defrosting operation Figure 2-3.7: MV5-X400(450, 500, 560, 615)W/V2GN1 refrigerant flow during oil return operation in heating mode and during defrosting operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure Solenoid 1-way...
  • Page 21 V5 X VRF 50/60Hz 201608...

  • Page 22: Table Of Contents

    V5 X VRF 50/60Hz Part 3 Control General Control Scheme Flowchart ............22 Stop Operation ..................23 Standby Control ................... 23 Startup Control ..................24 Normal Operation Control ..............25 Protection Control ................30 Special Control ..................32 201608...

  • Page 23: General Control Scheme Flowchart

    V5 X VRF 50/60Hz 1 General Control Scheme Flowchart Sections 3-2 to 3-7 on the following pages detail when each of the controls in the flowchart below is activated. Stop operation  Abnormal shutdown  System stops  A unit stops when the load demanded decreases Standby control Special control ...

  • Page 24: Stop Operation

    V5 X VRF 50/60Hz 2 Stop Operation The stop operation occurs for one of the three following reasons: 1. Abnormal shutdown: in order to protect the compressors, if an abnormal state occurs the system makes a 'stop with thermo off' operation and an error code is displayed on the outdoor unit digital displays. 2.

  • Page 25: Startup Control

    V5 X VRF 50/60Hz 4 Startup Control 4.1 Compressor Startup Delay Control In initial startup control, compressor startup is delayed for 12 minutes in order to let the master unit search for the indoor units’ addresses. In restart control (except in oil return operation and defrosting operation), compressor startup is delayed such that a minimum of 7 minutes has elapsed since the compressor stopped, in order to prevent frequent compressor on/off and to equalize the pressure within the refrigerant system.

  • Page 26: Normal Operation Control

    V5 X VRF 50/60Hz 5 Normal Operation Control 5.1 Component Control During Normal Operation Table 3-5.1: Component control during normal cooling operation Wiring Component 8-12HP 14-22HP Control functions and states diagram label Inverter compressor A ● ● COMP(INV) Controlled according to load requirement Inverter compressor B COMP(INV1) ●...
  • Page 27 V5 X VRF 50/60Hz 5.3 Compressor Step Control The running speed of the compressors in rotations per second (rps) is half the frequency (in Hz) of the electrical input to the compressor motors. The compressor speed can be altered in increments of 1 rps. 5.4 Operating Priority and Rotation of Compressors Figures 3-5.1 to 3-5.4 show the compressor operating priority and rotation in systems with one, two, three and four outdoor units.
  • Page 28 V5 X VRF 50/60Hz Figure 3-5.4: Compressor priority and rotation – four outdoor units No. 1 No. 2 No. 3 No. 4 ① No. 4 No. 1 No. 2 No. 3 ② No. 3 No. 4 No. 1 No. 2 ③...
  • Page 29 V5 X VRF 50/60Hz No. 1 No. 2 No. 3 No. 4 No. 5 No. 6 No. 7 No. 8 ① ② No. 7 No. 8 No. 1 No. 2 No. 3 No. 4 No. 5 No. 6 ③ No. 5 No.
  • Page 30 V5 X VRF 50/60Hz 5.6 Outdoor Fan Control The speed of the outdoor unit fans is adjusted in steps, as shown in Table 3-5.3. Table 3-5.3: Outdoor fan speed steps Fan speed (rpm) Fan speed index 14/16HP 18HP 20/22HP 10HP 12HP FANA FANB...

  • Page 31: Protection Control

    V5 X VRF 50/60Hz 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 > 4.4MPa <...
  • Page 32 V5 X VRF 50/60Hz high temperatures. It is performed for each compressor and inverter module. Figure 3-6.4: Compressor current protection control Normal operation Current > Current Current < Current Compressor current protection, error code xP3 is displayed Table 3-6.1: Current limitation for compressors Compressor model E705DHD-72 E655DHD-65...

  • Page 33: Special Control

    V5 X VRF 50/60Hz 7 Special Control 7.1 Outdoor Unit Duty Cycling In systems with multiple outdoor units, outdoor unit duty cycling is used to prevent compressor burn out due to unbalanced oil levels between outdoor units. Timing of outdoor unit duty cycling: ...
  • Page 34 V5 X VRF 50/60Hz Table 3-7.2: Indoor unit component control during oil return operation in cooling mode Component Unit state Control functions and states Thermo on Remote controller setting Standby Thermo off Remote controller setting Thermo on Normal control Electronic expansion valve Standby 300 (steps) Thermo off...
  • Page 35 V5 X VRF 50/60Hz 7.3 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.
  • Page 36 V5 X VRF 50/60Hz Part 4 Field Settings Outdoor Unit Field Settings ..............36 201608...
  • Page 37 V5 X VRF 50/60Hz 1 Outdoor Unit Field Settings 1.1 PCB Switches and Switch Settings Figure 4-1.1: Outdoor unit main PCB switches PCB switches ENC1 ENC3 S12 S3 S8 ENC2 S1 ENC4 S10 Table 4-1.1: Outdoor unit main PCB switch settings Switch Setting Switch positions...
  • Page 38 V5 X VRF 50/60Hz Table 4-1.1: Outdoor unit main PCB switch settings (continued) Switch Setting Switch positions Description Heating priority (default) 1 2 3 Cooling priority 1 2 3 Priority mode VIP priority or voting priority 1 2 3 Heating only 1 2 3 Cooling only 1 2 3...
  • Page 39 V5 X VRF 50/60Hz 1.2 Modes Set on Main PCB 1.2.1 Night silent time setting Night silent mode is activated X hours after the peak daytime temperature, and is deactivated after Y hours, where X and Y are as specified in Table 4-1.2. Table 4-1.2: Night silent time setting Switch Switch positions...
  • Page 40 V5 X VRF 50/60Hz 1.2.2 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. If the indoor unit has a digital display, it will display error code E0; if the indoor unit display board has LED indicators, the “DEF./FAN”...
  • Page 41 V5 X VRF 50/60Hz 1.2.3 Addressing mode setting The V5 X supports two addressing modes, auto addressing and manual addressing:  If an indoor centralized controller (CCM03, CCM09 or CCM30) is connected directly to the master outdoor unit’s X Y E terminals, the master unit must be set to auto addressing mode.
  • Page 42 V5 X VRF 50/60Hz Part 5 Diagnosis and Troubleshooting Outdoor Unit Electric Control Box Layout ..........42 Outdoor Unit Main PCB ............... 43 Error Code Table .................. 47 Troubleshooting .................. 49 Appendix to Part 5 ................101 201608...
  • Page 43 V5 X VRF 50/60Hz 1 Outdoor Unit Electric Control Box Layout MV5-X252W/V2GN1 / MV5-X280W/V2GN1 / MV5-X335W/V2GN1 Figure 5-1.1: Bottom layer of electric control box Figure 5-1.2: Top layer of electric control box Inverter module Three-phase bridge rectifier Transformers DC filter board...
  • Page 44 V5 X VRF 50/60Hz 2 Outdoor Unit Main PCB 2.1 Types There are four main PCB types for V5 X outdoor units. 8/10/12HP units share a main PCB type, 14/16HP share a main PCB type, 18HP has a unique main PCB type, and 20/22HP share a main PCB type. The type label is affixed to the main PCB. When changing a main PCB, be sure to use the right type of main PCB.
  • Page 45 V5 X VRF 50/60Hz Table 5-2.2: Main PCB ports Label in Port Content Port voltage Figure 5-2.1 code Compressor top temperature sensor (single compressor units) or CN10 compressor A compressor top temperature sensor (dual 0-5V DC (varying) compressor units) connection Discharge pipe temperature sensor (single compressor units) or CN11 compressor B compressor top temperature sensor (dual...
  • Page 46 V5 X VRF 50/60Hz 2.3 Components 2.3.1 Layout Figure 5-2.2: Outdoor unit main PCB components DSP1 Digital display DSP2 Current sensors Buttons SW1/2/3/4 Inverter drive chips LED indicators LED1/2/3 LED indicators Main control chip LED6/7 Communication chip LED indicators LED4/5 2.3.2 Function of buttons SW1 to SW4 Table 5-2.3: Function of buttons SW1 to SW4...
  • Page 47 V5 X VRF 50/60Hz Table 5-2.4: SW2 system check (continued) DSP1 Parameters displayed on DSP2 Remarks content Fan B speed index Refer to Note 3 Indoor heat exchanger pipe temperature (°C) Actual value = value displayed Outdoor heat exchanger pipe temperature (°C) Actual value = value displayed Outdoor ambient temperature (°C) Actual value = value displayed...
  • Page 48 V5 X VRF 50/60Hz 2.3.4 Digital display output Table 5-2.5: Digital display output in different operating states Outdoor unit state Parameters displayed on DSP1 Parameters displayed on DSP2 DSP1 number indoor units Standby Unit's address communication with the outdoor units For single Running speed of the compressor in Normal...
  • Page 49 V5 X VRF 50/60Hz Table 5-3.1: Error code table (continued) Error code Content Remarks Number of indoor units detected by master unit not same as number set Only displayed on the master unit on main PCB Discharge pipe low pressure protection. Displayed on the unit with the error Slave unit malfunction Only displayed on the master unit...
  • Page 50 V5 X VRF 50/60Hz 4 Troubleshooting 4.1 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 51 V5 X VRF 50/60Hz 4.2 E0 Troubleshooting 4.2.1 Digital display output 4.2.2 Description  Communication error between outdoor units.  All units stop running.  Error code is only displayed on the slave unit with the error. 4.2.3 Possible causes ...
  • Page 52 V5 X VRF 50/60Hz 4.2.4 Procedure ODU addresses on switch ENC1 are set Set the ODU addresses correctly incorrectly Ensure the communication wires are Communication wires between ODUs are three-core shielded cable and are not connected properly connected properly Wires between outdoor main PCB and electric control box communication Ensure the wires are connected properly terminals block are loose...
  • Page 53 V5 X VRF 50/60Hz 4.3 E1 Troubleshooting 4.3.1 Digital display output 4.3.2 Description  Phase sequence error.  All units stop running.  Error code is only displayed on the unit with the error. 4.3.3 Possible causes  Power supply phases not connected in correct sequence. ...
  • Page 54 V5 X VRF 50/60Hz 4.3.4 Procedure The phase sequence of the 3-phase Exchange any two of the 3 phase wires power supply is incrorrect Ensure all supply terminals are securely Some power supply terminals are loose fastened The power supply is abnormal Check the power supply equipment Replace outdoor main PCB Notes:...
  • Page 55 V5 X VRF 50/60Hz 4.4 E2 Troubleshooting 4.4.1 Digital display output 4.4.2 Description  Communication error between indoor and master unit.  All units stop running.  Error code is only displayed on the master unit. 4.4.3 Possible causes  Communication wires between indoor and outdoor units not connected properly. ...
  • Page 56 V5 X VRF 50/60Hz 4.4.4 Procedure Communication wires P Q E have short Reconnect the communication wires circuited or disconnected Communication wires P Q E are not Connect the communication wires in a connected in a daisy chain daisy chain IDU power supply is abnormal Ensure normal power supply Wires between outdoor main PCB and...
  • Page 57 V5 X VRF 50/60Hz 4.5 E4, E7 Troubleshooting 4.5.1 Digital display output 4.5.2 Description  E4 indicates an outdoor ambient temperature sensor error.  E7 indicates a compressor top temperature sensor or discharge pipe temperature sensor error.  All units stop running. ...
  • Page 58 V5 X VRF 50/60Hz 4.5.4 Procedure E4 / E7 Temperature sensor connection on main Ensure the sensor is connected properly PCB is loose Temperature sensor has short-circuited Replace the sensor or failed Replace outdoor main PCB Notes: Outdoor ambient temperature sensor connection is port CN1 on the main PCB (labeled 32 in Figure 5-2.1 in Part 5, 2.2 “Ports”). Compressor top temperature sensor and discharge pipe temperature sensor connections are ports CN10 and CN11 on the main PCB (labeled 1 and 2, respectively, in Figure 5-2.1 in Part 5, 2.2 “Ports”).
  • Page 59 V5 X VRF 50/60Hz 4.6 E5 Troubleshooting 4.6.1 Digital display output 4.6.2 Description  Abnormal power supply voltage.  All units stop running.  Error code is only displayed on the unit with the error. 4.6.3 Possible causes  Outdoor unit power supply voltage not within ±10% of rated voltage or a phase is missing. ...
  • Page 60 V5 X VRF 50/60Hz 4.6.4 Procedure ODU power supply voltage is not within ±10% of rated voltage or a phase is Provide normal power supply 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...
  • Page 61 V5 X VRF 50/60Hz 4.7 E8 Troubleshooting 4.7.1 Digital display output 4.7.2 Description  Outdoor unit address error.  All units stop running.  Error code is only displayed on the unit with the error. 4.7.3 Possible causes  Invalid outdoor unit address. ...
  • Page 62 V5 X VRF 50/60Hz 4.7.4 Procedure The ODU's address is not in the valid Slave units addresses should be set from range 1 to 3 Replace the outdoor main PCB Notes: The master unit address should be set as 0, slave units addresses should be set from 1 to 3, and the addresses should not be repeated within one system. Refer to Part 4, 1.1 “PCB Switches and Switch Settings”.
  • Page 63 V5 X VRF 50/60Hz 4.8 xE9 Troubleshooting 4.8.1 Digital display output In the error code, 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. 4.8.2 Description ...
  • Page 64 V5 X VRF 50/60Hz 4.8.4 Procedure Power off the unit and wait for the digital The outdoor unit was powered on display to turn off before restarting the immediately after being powered off unit Replace outdoor main PCB Notes: When performing a manual restart of an outdoor unit, once the unit has been powered off it should not be powered on again until the digital display has turned off.
  • Page 65 V5 X VRF 50/60Hz 4.9 xH0, H1 Troubleshooting 4.9.1 Digital display output In the error code, 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. 4.9.2 Description ...
  • Page 66 V5 X VRF 50/60Hz 4.9.4 Procedure xH0 / H1 Power supply for main PCB and Provide normal power supply transformer is abnormal The transformer has malfunctioned Replace the transformer There is a source of electromagnetic radiation near the unit, such as Remove the source of interference high-frequency transmitter or other high strength radiation device...
  • Page 67 V5 X VRF 50/60Hz 4.10 H2, H3 Troubleshooting 4.10.1 Digital display output 4.10.2 Description  H2 indicates that the number of slave units detected by master unit has decreased.  H3 indicates that the number of slave units detected by master unit has increased. ...
  • Page 68 V5 X VRF 50/60Hz 4.10.4 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: Check LED1 on the main PCB.
  • Page 69 V5 X VRF 50/60Hz 4.11 xH4 Troubleshooting 4.11.1 Digital display output In the error code, 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. 4.11.2 Description ...
  • Page 70 V5 X VRF 50/60Hz Table 5-4.1: Specific error codes for error xH4 Specific error code Content Inverter module protection DC bus low voltage protection DC bus high voltage protection MCE error Zero speed protection Phase sequence error Compressor frequency variation greater than 15Hz within one second protection Actual compressor frequency differs from target frequency by more than 15Hz protection Notes: 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and...
  • Page 71 V5 X VRF 50/60Hz 4.11.5 First troubleshooting step To troubleshoot xH4 errors, first ensure that the DC bus wire is connected correctly. The DC bus wire should run from the N terminal on the inverter module, through the current sensor (in the direction indicated by the arrow on the current sensor), and end at the N terminal on the DC filter board.
  • Page 72 V5 X VRF 50/60Hz Figure 5-4.8: Inverter module terminals U V W 4.11.7 xL1/xL4 troubleshooting Step 1: Check inverter module  Check the DC voltage between terminals P and N. The normal value is 510-580V. If the voltage is lower than 510V, go to Step 2.
  • Page 73 V5 X VRF 50/60Hz 4.11.8 xL2 troubleshooting Step 1: Check inverter module  Check the DC voltage between terminals P and N. The normal value is 510-580V, if the voltage is higher than 580V, go to Step 2. Figure 5-4.11: Inverter module terminals Step 2: Check capacitor board ...
  • Page 74 V5 X VRF 50/60Hz and ensure the wiring is correct; if the compressor with the xL8/xL9 error still does not run normally, it needs to be replaced. Refer to Part 5, 4.11.10 “Compressor replacement procedure”. Figure 5-4.13: Connecting compressor to an error-free unit Unit with error Unit operating normally Connect...
  • Page 75 V5 X VRF 50/60Hz Step 5: Check filters(s)  If the oil from a compressor is spoiled (lightly or heavily), check the filter between the gas stop valve and the 4-way valve in that unit. If it is blocked, clean with nitrogen or replace. Figure 5-4.15: Compressor piping Step 6: Replace the faulty compressor and re-fit the other compressors ...
  • Page 76 V5 X VRF 50/60Hz Figure 5-4.17: 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 201608...
  • Page 77 V5 X VRF 50/60Hz 4.12 H7 Troubleshooting 4.12.1 Digital display output 4.12.2 Description  Number of indoor units detected by master unit not same as number set on main PCB.  All units stop running.  Error code is only displayed on the master unit. 4.12.3 Possible causes ...
  • Page 78 V5 X VRF 50/60Hz 4.12.4 Procedure Number of indoor units set on main PCB Change the setting on the PCB to be the not same as actual number of indoor same as the actual number of indoor units units Some indoor units are powered off Power on all indoor units After re-starting the ODUs and IDUs and Refer to indoor unit troubleshooting...
  • Page 79 V5 X VRF 50/60Hz 4.13 H8 Troubleshooting 4.13.1 Digital display output 4.13.2 Description  Discharge pipe low pressure protection. When the discharge pressure falls below 0.3MPa, the system displays H8 protection and all units stop running. When the discharge pressure returns to normal, H8 is removed and normal operation resumes.
  • Page 80 V5 X VRF 50/60Hz 4.13.4 Procedure ODU stop valves are closed Open the stop valves High pressure sensor connection on main Ensure the sensor is connected properly PCB is loose High pressure sensor has short-circuited Replace the sensor or failed Insufficient refrigerant caused by Add refrigerant and inspect system for refrigerant leakage...
  • Page 81 V5 X VRF 50/60Hz 4.14 yHd Troubleshooting 4.14.1 Digital display output In the error code, 'y' is a placeholder for the address (1, 2 or 3) of the slave unit with the error. 4.14.2 Description  1Hd indicates an error on the slave unit with address 1. ...
  • Page 82 V5 X VRF 50/60Hz 4.14.4 Procedure Check relevant slave unit 201608...
  • Page 83 V5 X VRF 50/60Hz 4.15 P0, P4, H6 Troubleshooting 4.15.1 Digital display output 4.15.2 Description  P0 indicates compressor temperature protection.  P4 indicates discharge temperature protection. When the discharge temperature rises above 120°C the system displays P4 protection and all units stop running. ...
  • Page 84 V5 X VRF 50/60Hz … flowchart continued from previous page Insufficient refrigerant caused by Add refrigerant and inspect the system refrigerant leakage for leaks Inspect the system and fix the error. If the The system is blocked, caused by crushed filter is blocked by ice, the piping should or bent pipe, blocked EXV or dirty filter be cleaned...
  • Page 85 V5 X VRF 50/60Hz 4.16 P1 Troubleshooting 4.16.1 Digital display output 4.16.2 Description  Discharge pipe high pressure protection. When the discharge pressure rises above 4.4MPa, the system displays P1 protection and all units stop running. When the discharge pressure falls below 3.2MPa, P1 is removed and normal operation resumes.
  • Page 86 V5 X VRF 50/60Hz … flowchart continued from previous page Flush all refrigerant then vacuum the System contains air or nitrogen system and recharge the refrigerant. Add oil to the system if it leaks The high pressure side is blocked, caused Inspect the system and fix the error by crushed or bent pipe or blocked EXV The condenser heat exchange is poor...
  • Page 87 V5 X VRF 50/60Hz 4.17 P2, H5 Troubleshooting 4.17.1 Digital display output 4.17.2 Description  P2 indicates suction pipe low pressure protection. When the suction pressure falls below 0.05MPa, the system displays P2 protection and all units stop running. When the pressure rises above 0.15MPa, P2 is removed and normal operation resumes.
  • Page 88 V5 X VRF 50/60Hz 4.17.4 Procedure P2 / H5 ODU stop valves are closed Open the stop valves Insufficient refrigerant caused by Add refrigerant or inspect the system for refrigerant leakage leaks The low pressure side is blocked, caused Inspect the system and fix the error. If the by crushed or bent pipe, blocked EXV, or filter is blocked by ice, the piping should dirty filter...
  • Page 89 V5 X VRF 50/60Hz 4.18 xP3 Troubleshooting 4.18.1 Digital display output 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. 4.18.2 Description  1P3 indicates current protection on compressor A. ...
  • Page 90 V5 X VRF 50/60Hz … flowchart continued from previous page Discharge part of the refrigerant. Add oil Excess refrigerant if it leaks during discharge Flush all refrigerant then vacuum the System contains air or nitrogen system and recharge refrigerant. Add oil to the system if it leaks The condenser heat exchange is poor Inspect the system and fix the error...
  • Page 91 V5 X VRF 50/60Hz 4.19 P5 Troubleshooting 4.19.1 Digital display output 4.19.2 Description  Outdoor heat exchanger temperature protection. When the outdoor heat exchanger temperature rises above 65 the system displays P5 protection and all units stop running. When the temperature returns to the normal range, P5 is removed and normal operation resumes.
  • Page 92 V5 X VRF 50/60Hz 4.19.4 Procedure ODU stop valves are closed Open the stop valves Outdoor heat exchanger temperature Ensure the sensor is connected properly sensor connection on main PCB is loose Outdoor heat exchanger temperature Replace the sensor sensor has short-circuited or failed Make sure the combination ratio is less The indoor load is too large than 130%...
  • Page 93 V5 X VRF 50/60Hz 4.20 P9, H9 Troubleshooting 4.20.1 Digital display output 4.20.2 Description  P9 indicates fan module protection. All units stop running.  H9 indicates that P9 protection has occurred 3 times in 60 minutes. When an H9 error occurs, a manual system restart is required before the system can resume operation.
  • Page 94 V5 X VRF 50/60Hz … flowchart continued from previous page The power supply is abnormal Check the power supply equipment Voltage between P and N on fan module Replace AC filter board is abnormal Replacing the fan module resolves the error Replace outdoor main PCB Notes:...
  • Page 95 V5 X VRF 50/60Hz 4.21 PL, C7 Troubleshooting 4.21.1 Digital display output 4.21.2 Description  PL indicates inverter module temperature protection. When the main inverter module temperature rises above 80 the system displays PL protection and all units stop running. ...
  • Page 96 V5 X VRF 50/60Hz 4.21.4 Procedure PL / C7 The inverter module heat sink is blocked Clean or replace the heat sink or dirty The screws connecting the heat sink to Tighten the screws and make sure the the inverter module are loose heat sink is well-connected Inverter module temperature sensor Ensure the sensor is connected properly...
  • Page 97 V5 X VRF 50/60Hz 4.22 PP, F0 Troubleshooting 4.22.1 Digital display output 4.22.2 Description  PP indicates compressor discharge insufficient superheat protection. When the discharge gas superheat is ≤0°C for 20 minutes or ≤5°C for 60 minutes, the system displays PP protection and all units stop running. ...
  • Page 98 V5 X VRF 50/60Hz 4.22.4 Procedure PP / F0 Compressor top temperature sensor and/or discharge pipe temperature Ensure the sensors are connected sensor connections on main PCB are properly loose Compressor top temperature sensor and/or discharge pipe temperature Replace the faulty sensor(s) sensor have short circuited or failed Poor heat insulation of compressor top temperature sensor resulting in...
  • Page 99 V5 X VRF 50/60Hz 4.23 xF1 Troubleshooting 4.23.1 Digital display output 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. 4.23.2 Description  1F1 indicates compressor A DC bus voltage error. ...
  • Page 100 V5 X VRF 50/60Hz … flowchart continued from previous page Wires between DC filter board and Ensure the wires are inverter module are loose connected properly Wires from three-phase bridge rectifier Ensure the wires are to reactor, DC filter board and/or AC connected properly filter board are loose Check the power...
  • Page 101 V5 X VRF 50/60Hz Voltage monitor port is port CN5 on the inverter module. Refer to Figure 5-4.20. Figure 5-4.20: Voltage monitor port (CN5) on inverter module terminals U V W Refer to Figures 5-1.1 to 5-1.4 in Part 5, 1 “Outdoor Unit Electric Control Box Layout” and to the V5 X Engineering Data Book, Part 2, 5 “Wiring Diagrams”. Power output port is port CN54 on the main PCB (labeled 16, in Figure 5-2.1 in Part 5, 2.2 "Ports").
  • Page 102 V5 X VRF 50/60Hz 5 Appendix to Part 5 5.1 Temperature Sensor Resistance Characteristics Table 5-5.1: Outdoor ambient temperature sensor and outdoor heat exchanger temperature sensor resistance characteristics Temperature Resistance Temperature Resistance Temperature Resistance Temperature Resistance (°C) (kΩ) (°C) (kΩ) (°C) (kΩ) (°C)
  • Page 103 V5 X VRF 50/60Hz Table 5-5.2: Compressor top temperature sensor and discharge pipe temperature sensor resistance characteristics Temperature Temperature Temperature Temperature Resistance Resistance Resistance Resistance (kΩ) (kΩ) (kΩ) (kΩ) (°C) (°C) (°C) (°C) 542.7 68.66 13.59 3.702 511.9 65.62 13.11 3.595 483.0 62.73...
  • Page 104 V5 X VRF 50/60Hz Table 5-5.3: Inverter module temperature sensor resistance characteristics Temperature Temperature Temperature Temperature Resistance Resistance Resistance Resistance (kΩ) (kΩ) (kΩ) (kΩ) (°C) (°C) (°C) (°C) 971.4 109.0 19.70 5.000 912.8 103.9 18.97 4.855 858.2 99.02 18.26 4.705 807.3 94.44 17.59...
  • Page 105 V5 X VRF 50/60Hz 5.2 Normal Operating Parameters of Refrigerant System Under the following conditions, the operating parameters given in Tables 5-5.4 and 5-5.5 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 106 Commercial Air Conditioner Division Midea Group Add.: Midea Headquarters Building, 6 Midea Avenue, Shunde, Foshan, Guangdong, China Postal code: 528311 Tel: +86-757-26338346; Fax: +86-757-22390205 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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