Trane 4TVH0086FE000AA Service Manual
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Trane 4TVH0086FE000AA Service Manual

Commercial air conditioners
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Service Manual
4TVH0086FE000AA
4TVH0096FE000AA
4TVH0115FE000AA
4TVH0140FE000AA
4TVH0155FE000AA
4TVH0170FE000AA
Commercial Air Conditioners
4TVH0192FE000AA
4TVH0210FE000AA
4TVH0229FE000AA
4TVH0249FE000AA
4TVH0268FE000AA
4TVH0290FE000AA
4TVH0307FE000AA
R410A

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  • Page 1 R410A Commercial Air Conditioners Service Manual 4TVH0086FE000AA 4TVH0192FE000AA 4TVH0210FE000AA 4TVH0096FE000AA 4TVH0229FE000AA 4TVH0115FE000AA 4TVH0249FE000AA 4TVH0140FE000AA 4TVH0268FE000AA 4TVH0155FE000AA 4TVH0290FE000AA 4TVH0170FE000AA 4TVH0307FE000AA...

  • Page 2: Table Of Contents

    CONTENTS Part 1 General Information ................3 Part 2 Component Layout and Refrigerant Circuits ........16 Part 3 Control ....................39 Part 4 Field Settings ..................53 Part 5 Electrical Components and Wiring Diagrams ........59 Part 6 Diagnosis and Troubleshooting ............72...

  • Page 4: Part 1 General Information

    Part 1 General Information Indoor and Outdoor Unit Capacities ............4 External Appearance ................6 Nomenclature ..................8 Combination Ratio ................10 Selection Procedure ................11...

  • Page 5: Indoor And Outdoor Unit Capacities

    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 & Floor Four-way Cassette S, N, U Floor Standing...
  • Page 6 1.3 Outdoor Units Table 1-1.5: Outdoor unit capacity range Capacity Model Name 4TVH0086FE000AA 10HP 4TVH0096FE000AA 12HP 4TVH0115FE000AA 14HP 4TVH0140FE000AA 16HP 4TVH0155FE000AA 18HP 4TVH0170FE000AA 20HP 4TVH0192FE000AA 22HP 4TVH0210FE000AA 24HP 4TVH0229FE000AA 26HP 4TVH0249FE000AA 28HP 4TVH0268FE000AA 30HP 4TVH0290FE000AA 32HP 4TVH0307FE000AA...

  • Page 7: External Appearance

    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 Medium Static Pressure Duct High Static Pressure Duct Wall-mounted Ceiling & Floor Floor Standing S,N,U 2.1.2 Fresh air processing unit Table 1-2.2: Fresh air processing unit appearance Fresh Air Processing Unit...
  • Page 8 2.3 Outdoor Units Table 1-2.4: Outdoor unit appearance 8/10/12HP 14/16/18HP 20/22HP 24/26/28/30/32HP (with single fan) (with single fan) (with dual fans) (with dual fans)

  • Page 9: Nomenclature

    4 T V E 0 1 2 3 4 5 Legend Code Remarks R-410A Trane Indoor Unit Type E: One - Way Cassette G: Two - Way Cassette B: Compact Four - Way Cassette C: Four - Way Cassette D: Medium Static Pressure Duct...
  • Page 10 3.2 Heat recovery ventilator AC Series T E R V 0 1 2 3 Legend Code Remarks Energy recovery Fan Trane TVR 1: 380V/60Hz/1Ph B: 380/50Hz/1Ph Currently not used First design sequence First service sequence 3.3 Outdoor Units 4 T V H 0...

  • Page 11: Combination Ratio

    4 Combination Ratio Sum of capacity indexes of the indoor units Combination ratio = Capacity index of the outdoor unit 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 units only units only...

  • Page 12: Selection Procedure

    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: Indoor unit capacity corrected for indoor air temperature WB...
  • Page 13 5.2 Example The following is a selection example based on total heat load for cooling. Figure 1-5.1: Room plan Room H Room G Room A Room F Room B Room E Room C Room D Step 1: Establish design conditions ...
  • Page 14 Table 1-5.2: Extract from medium static pressure duct (T2) cooling capacity table Indoor air temperature Capacity 14°C WB 16°C WB 18°C WB 19°C WB 20°C WB 22°C WB 24°C WB Model index 20°C DB 23°C DB 26°C DB 27°C DB 28°C DB 30°C DB 32°C DB...
  • Page 15 Table 1-5.5: Extract from Table 1-5.2 Combinations of Indoor and outdoor units Outdoor unit capacity Sum of capacity indexes of Maximum number of connected indoor units (standard connected indoor Capacity indoor units only) units index 50.0 250 to 650 56.0 280 to 728 61.5 307.5 to 799.5...
  • Page 16 Find the correction factor for piping length and level difference (“K1”) Figure 1-5.3: V6-i rate of change in cooling capacity K1 = 0.898 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 -100 -110 Notes:...

  • Page 17: Part 2 Component Layout And Refrigerant Circuits

    Part 2 Component Layout and Refrigerant Circuits Layout of Functional Components ............17 Piping Diagrams .................. 23 Refrigerant Flow Diagrams ..............29...
  • Page 18 1 Layout of Functional Components 8/10/12HP Figure 2-1.1: 8/10/12HP layout of functional components Legend Parts name Compressor Discharge temperature switch High pressure switch High pressure sensor Oil separator Four-way valve Heat exchanger Electronic expansion valve (EXV) Low pressure switch Fan motor Stop valve (liquid side) Stop valve (gas side) Plate heat exchanger...
  • Page 19 14/16/18HP Figure 2-1.2: 14/16/18HP layout of functional components Legend Parts name Compressor Discharge temperature switch High pressure switch High pressure sensor Oil separator Four-way valve Heat exchanger Electronic expansion valve (EXV) Low pressure switch Fan motor Stop valve (liquid side) Stop valve (gas side) Plate heat exchanger Accumulator...
  • Page 20 20/22HP Figure 2-1.3: 20/22HP layout of functional components Legend Parts name Compressor Discharge temperature switch High pressure switch High pressure sensor Oil separator Four-way valve Heat exchanger Electronic expansion valve (EXV) Low pressure switch Fan motor Stop valve (liquid side) Stop valve (gas side) Accumulator...
  • Page 21 24HP Figure 2-1.4: 24HP layout of functional components Legend Parts name Compressor Discharge temperature switch High pressure switch High pressure sensor Oil separator Four-way valve Heat exchanger Electronic expansion valve (EXV) Low pressure switch Fan motor Stop valve (liquid side) Stop valve (gas side) Accumulator...
  • Page 22 26/28HP Figure 2-1.5: 26/28HP layout of functional components Legend Parts name Compressor Discharge temperature switch High pressure switch High pressure sensor Oil separator Four-way valve Heat exchanger Electronic expansion valve (EXV) Low pressure switch Fan motor Stop valve (liquid side) Stop valve (gas side) Plate heat exchanger Accumulator...
  • Page 23 30/32HP Figure 2-1.6: 30/32HP layout of functional components Legend Parts name Compressor Discharge temperature switch High pressure switch High pressure sensor Oil separator Four-way valve Heat exchanger Electronic expansion valve (EXV) Low pressure switch Fan motor Stop valve (liquid side) Stop valve (gas side) Plate heat exchanger Accumulator...
  • Page 24 2 Piping Diagrams 8/10/12HP Figure 2-2.1: 8/10/12HP piping diagram E S C EXVA EXVC T7C1 Legend Parts name Parts name Compressor Plate heat exchanger Discharge temperature switch Accumulator High pressure switch Heat exchanger temperature sensor High pressure sensor Outdoor ambient temperature sensor Oil separator Plate heat exchanger inlet temperature sensor Four-way valve...
  • Page 25 14/16/18HP Figure 2-2.2: 14/16/18HP piping diagram EXVA EXVC T7C1 Legend Parts name Parts name Compressor Plate heat exchanger Discharge temperature switch Accumulator High pressure switch Heat exchanger temperature sensor High pressure sensor Outdoor ambient temperature sensor Oil separator Plate heat exchanger inlet temperature sensor Four-way valve Plate heat exchanger outlet temperature sensor Heat exchanger...
  • Page 26 20/22/24HP Figure 2-2.3: 20/22/24HP piping diagram E S C EXVA T7C1 T7C2 Legend Parts name Parts name Compressor Stop valve (gas side) Discharge temperature switch Accumulator High pressure switch Heat exchanger temperature sensor High pressure sensor Outdoor ambient temperature sensor Oil separator T7C1 Compressor A discharge temperature sensor...
  • Page 27 26/28HP Figure 2-2.4: 26/28HP piping diagram EXVA EXVC T7C1 T7C2 Legend Parts name Parts name Compressor Accumulator Discharge temperature switch Heat exchanger temperature sensor High pressure switch Outdoor ambient temperature sensor High pressure sensor Plate heat exchanger inlet temperature sensor Oil separator Plate heat exchanger outlet temperature sensor Four-way valve...
  • Page 28 30/32HP Figure 2-2.5: 30/32HP piping diagram EXVA EXVC T7C1 T7C2 Legend Parts name Parts name Compressor Accumulator Discharge temperature switch Heat exchanger temperature sensor High pressure switch Outdoor ambient temperature sensor High pressure sensor Plate heat exchanger inlet temperature sensor Oil separator Plate heat exchanger outlet temperature sensor Four-way valve...
  • Page 29 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 30 3 Refrigerant Flow Diagrams 8/10/12HP Cooling operation Figure 2-3.1: 8/10/12HP refrigerant flow during cooling operation High temperature, high pressure gas High temperature, high pressure liquid Medium temperature, medium pressure gas Unit on Low temperature, low pressure Thermostat on Filter Filter Normal control E S C Unit on...
  • Page 31 Oil return operation in heating mode and defrosting operation Figure 2-3.3: 8/10/12HP refrigerant flow during oil return operation in heating mode and during defrosting operation High temperature, high pressure gas High temperature, high pressure liquid Medium temperature, medium pressure gas Unit on Low temperature, low pressure Thermostat on...
  • Page 32 14/16/18HP Cooling operation Figure 2-3.5: 14/16/18HP refrigerant flow during cooling operation High temperature, high pressure gas High temperature, high pressure liquid Medium temperature, medium pressure gas Unit on Low temperature, low pressure Thermostat on Filter Filter Normal control E S C Unit on EXVA Thermostat on...
  • Page 33 Oil return operation in heating mode and defrosting operation Figure 2-3.7: 14/16/18HP refrigerant flow during oil return operation in heating mode and during defrosting operation High temperature, high pressure gas High temperature, high pressure liquid Medium temperature, medium pressure gas Unit on Low temperature, low pressure Thermostat on...
  • Page 34 20/22/24HP Cooling operation Figure 2-3.9: 20/22/24HP refrigerant flow during cooling operation High temperature, high pressure gas Unit on High temperature, high pressure liquid Thermostat on Medium temperature, medium pressure gas Filter Filter Low temperature, low pressure Normal control Unit on E S C Thermostat on Filter...
  • Page 35 Oil return operation in heating mode and defrosting operation Figure 2-3.11: 20/22/24HP refrigerant flow during oil return operation in heating mode and during defrosting operation High temperature, high pressure gas Unit on Thermostat on High temperature, high pressure liquid Medium temperature, medium pressure gas Filter Filter Low temperature, low pressure...
  • Page 36 26/28HP Cooling operation Figure 2-3.13: 26/28HP refrigerant flow during cooling operation High temperature, high pressure gas Unit on High temperature, high pressure liquid Thermostat on Medium temperature, medium pressure gas Filter Filter Low temperature, low pressure Normal control Unit on E S C Thermostat on Filter...
  • Page 37 Oil return operation in heating mode and defrosting operation Figure 2-3.15: 26/28HP refrigerant flow during oil return operation in heating mode and during defrosting operation High temperature, high pressure gas Unit on High temperature, high pressure liquid Thermostat on Medium temperature, medium pressure gas Filter Filter Low temperature, low pressure...
  • Page 38 30/32HP Cooling operation Figure 2-3.17: 30/32HP refrigerant flow during cooling operation High temperature, high pressure gas Unit on High temperature, high pressure liquid Thermostat on Medium temperature, medium pressure gas Filter Filter Low temperature, low pressure Normal control Unit on E S C Thermostat on Filter...
  • Page 39 Oil return operation in heating mode and defrosting operation Figure 2-3.19: 30/32HP refrigerant flow during oil return operation in heating mode and during defrosting operation High temperature, high pressure gas Unit on High temperature, high pressure liquid Thermostat on Medium temperature, medium pressure gas Filter Filter Low temperature, low pressure...

  • Page 40: Part 3 Control

    Part 3 Control General Control Scheme Flowchart ............40 Stop Operation ..................41 Standby Control ................... 41 Startup Control ..................42 Normal Operation Control ..............44 Protection Control ................48 Special Control ..................50...

  • Page 41: General Control Scheme Flowchart

    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 ...

  • Page 42: Stop Operation

    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 43: Startup Control

    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 outdoor 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 44 4.3 Startup Control for Heating Operation Table 3-4.2: Component control during startup in heating mode Wiring Component diagram 8-12HP 14-18HP 20-24HP 26-28HP 30-32HP Control functions and states label Inverter compressor A COMP(A) Controlled according to load requirement, ● ● ● ●...

  • Page 45: Normal Operation Control

    5 Normal Operation Control 5.1 Component Control during Normal Operation Table 3-5.1: Component control during normal cooling operation Wiring Component diagram 8-12HP 14-18HP 20-24HP 26-28HP 30-32HP Control functions and states label Inverter compressor A COMP(A) ● ● ● ● ● Controlled according to load requirement Inverter compressor B COMP(B)
  • Page 46 Table 3-5.2: Component control during heating operation Wiring Component diagram 8-12HP 14-18HP 20-24HP 26-28HP 30-32HP Control functions and states label Inverter compressor A COMP(A) ● ● ● ● ● Controlled according to load requirement Inverter compressor B COMP(B) ● ● ●...
  • Page 47 5.2 Compressor Output Control The compressor rotation speed is controlled according to the load requirement. Before compressor startup, the outdoor unit first estimates the indoor unit load requirement according to the nominal capacity of indoor units currently running, and then correct for ambient temperature. The compressors then start up according to the corrected load requirement. During operation the compressors are controlled according to the nominal capacity of indoor units currently running and the indoor unit heat exchanger temperatures.
  • Page 48  When the outdoor unit is in standby:  EXVC is fully closed.  When the outdoor unit is running:  EXVC is controlled according to temperature different between plate heat exchanger inlet and outlet. 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...

  • Page 49: Protection Control

    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 < 3.2MPa High pressure protection, error code P1 is displayed Notes: : Discharge pressure 6.2 Low Pressure Protection Control...
  • Page 50 6.4 Compressor and Inverter Module Protection Control This control protects the compressors from abnormally high currents and protects the inverter modules from abnormally high temperatures. It is performed for each compressor and inverter module. Figure 3-6.4: Compressor current protection control Normal operation Current ≥...

  • Page 51: Special Control

    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 52 Tables 3-7.3 and 3-7.4 show component control during oil return operation in heating mode. Table 3-7.3: Outdoor unit component control during oil return operation in heating mode Wiring Component 8-12HP 14-18HP 20-24HP 26-28HP 30-32HP Control functions and states diagram label Inverter compressor A COMP(A) ●...
  • Page 53 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 unit running time. When the outdoor unit is running in defrosting, the digital display on outdoor main PCB will display “df”.

  • Page 54: Part 4 Field Settings

    Part 4 Field Settings Outdoor Unit Field Settings ..............54...
  • Page 55 1 Outdoor Unit Field Settings 1.1 PCB Switches and Switch Settings Figure 4-1.1: Outdoor unit main PCB switches PCB switches S4 S5 ENC2 ENC1 S9 ENC5 S13 S8 S6 S12 ENC3 ENC4 Table 4-1.1: Outdoor unit main PCB switch settings Switch Setting Switch positions...
  • Page 56 Table 4-1.1: Outdoor unit main PCB switch settings (continued) Switch Setting Switch positions Description No action (default) Clear indoor unit addresses S6-2 Clear indoor unit addresses Auto addressing (default) Addressing S6-3 mode Manual addressing Reserved Reserved S8-1 Start-up time is 12 minutes (default) Start-up time S8-2 Start-up time is 7 minutes...
  • Page 57 1.2 Modes Set on Main PCB 1.2.1 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. Figure 4-1.2: Indoor unit digital displays Digital display Digital display...
  • Page 58 3. VIP priority mode or voting priority mode: The default VIP address is 63, and the VIP address also can be changed through menu mode, refer to Part 5, 2.2.3 “Menu mode” Table 5-2.3 “nb8”. If the VIP indoor unit is operating, the outdoor unit operates in the mode of the VIP indoor unit.
  • Page 59 1.2.2.2 Silent mode setting In silent mode 1 / 2 / 3 and night silent mode, the outdoor fan speed decreases gradually. In super silent mode 1 / 2 / 3 / 4, not only the fan speed decreases gradually, but also the compressor frequency decreases gradually. Table 4-1.3: Silent mode setting Switch Switch positions...

  • Page 60: Part 5 Electrical Components And Wiring Diagrams

    Part 5 Electrical Components and Wiring Diagrams Outdoor Unit Electric Control Box Layout ..........60 Outdoor Unit Main PCB ............... 62 Compressor Inverter Module ............... 69 Wiring Diagrams .................. 70...
  • Page 61 1 Outdoor Unit Electric Control Box Layout 8-18HP Figure 5-1.1: 8-18HP top layer of electric control box Figure 5-1.2: 8-18HP bottom layer of electric control box Inverter Reactor module Fan module Bridge Compressor connection wire Pipe temp. sensor...
  • Page 62 20-32HP Figure 5-1.3: 20-32HP top layer of electric control box Figure 5-1.4: 20-32HP bottom layer of electric control box...
  • Page 63 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 64 Table 5-2.1: Main PCB ports Label in Port code Content Port voltage Figure 5-2.1 High pressure switch and discharge temperature switch(es) CN18 0V or 5V DC connections CN19 Low pressure switch connection 0V or 5V DC Compressor top temperature sensor (single compressor units) or compressor A compressor top temperature sensor 0-5V DC (varying) (dual compressor units) connection...
  • Page 65 2.2 Components Layout Figure 5-2.2: Outdoor unit main PCB components 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 menu SW3 (UP) modes. Not in menu mode: previous and next buttons for SW4 (DOWN) system check information.
  • Page 66 Menu mode 1. Long press SW5 “MENU” button for 5 seconds to enter menu mode, and the digital display displays “n1”; 2. Press SW3 / SW4 “UP / DOWN” button to select the first level menu “n1”, “n2”, “n3”, “n4”or “nb”; 3.
  • Page 67 Menu mode function: Table 5-2.3: Menu mode function Digital display Menu mode Remarks content Debug mode 1 All indoor units running in cooling mode If all indoor units in the system are the 2nd generation indoor units, all the indoor units Debug mode 2 will run in heating mode.
  • Page 68 How to exit specified menu mode: Table 5-2.4: Exit specified menu mode method: Menu mode Manual exit method Automatic exit method System restart Long press SW6 “OK” button when the digital Debug mode 1 (2) After running 120 minutes Invalid display is not in menu selection state Maintenance mode After running 60 minutes...
  • Page 69 Table 5-2.5: System check (continued) DSP1 Parameters displayed on DSP2 Remarks content 34.-- Reserved 35.-- Reserved 36.-- DC voltage A Actual value = value displayed × 10 37.-- DC voltage B Actual value = value displayed × 10 38.-- Reserved 39.-- Address of VIP indoor unit 40.--...
  • Page 70 3 Compressor Inverter Module Layout Figure 5-3.1: Compressor inverter module components LED indicators LED1 and LED2 Table 5-3.1: LED indicators LED1 and LED2 Indicator LED indicator function and status Inverter module operating indicator. Continuously on if the compressor is running normally and LED 1 flashing if an inverter module error has occurred LED 2...
  • Page 71 4 Wiring Diagrams 8-28HP Figure 5-4.1: 8-28HP wiring diagram EEVC T7C1 T7C2 O-FAN CN72 CN26 CN27 EEVA EEVB N-ON H-PRO L-PRO H-YL1 T4 T3 CN13 CN15 CN70 CN71 CN82 CN18 CN19 CN17 CN28...
  • Page 72 30-32HP Figure 5-4.2: 30-32HP wiring diagram EEVC T7C1 T7C2 O-FAN CN72 CN26 CN27 EEVA EEVB N-ON H-PRO L-PRO H-YL1 T4 T3 CN13 CN15 CN70 CN71 CN82 CN18 CN19 CN17 CN28...

  • Page 73: Part 6 Diagnosis And Troubleshooting

    Part 6 Diagnosis and Troubleshooting Error Code Table .................. 73 Troubleshooting .................. 74 Appendix to Part 6 ................126...
  • Page 74 1 Error Code Table Table 6-1.1: Error code table Error Manual re-start Content Remarks code required Communication error between indoor and outdoor units Displayed on the unit with the error Outdoor heat exchanger temperature sensor (T3) error or Displayed on the unit with the error outdoor ambient temperature sensor (T4) error Abnormal power supply voltage Displayed on the unit with the error...
  • Page 75 Table 6-1.1: Error code table (continued) Error Manual re-start Content Remarks code required Inverter module temperature protection Displayed on the unit with the error Compressor discharge insufficient superheat protection Displayed on the unit with the error Inverter module protection Displayed on the unit with the error DC bus low voltage protection Displayed on the unit with the error DC bus high voltage protection...
  • Page 76 2.2 E2: Communication error between indoor and outdoor unit Digital display output Description  Communication error between indoor and outdoor unit.  All units stop running.  Error code is only displayed on the outdoor unit. Trigger / recover condition ...
  • Page 77 Procedure Communication wires P Q E have short Reconnect the communication wires circuited or disconnected Communication wires P Q E are not Connect the communication wires in a connected in a daisy chain daisy chain IDU power supply is abnormal Ensure normal power supply Wires between outdoor main PCB and electric control box communication...
  • Page 78 2.3 E4: Temperature sensor (T3/T4) error Digital display output Description  Outdoor heat exchanger temperature sensor (T3) error or outdoor ambient temperature sensor (T4) error.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition ...
  • Page 79 Procedure Temperature sensor connection on main Ensure the sensor is connected properly PCB is loose Temperature sensor has short-circuited Replace the sensor or failed Replace outdoor main PCB Notes: Outdoor ambient temperature sensor (T4) and heat exchanger temperature sensor (T3) connection is port CN1 on the main PCB (labeled 11 in Figure 5-2.1 in Part 5, 2.1 “Ports”).
  • Page 80 2.4 E5: Abnormal power supply voltage Digital display output Description  Abnormal power supply voltage.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition  Trigger condition: Outdoor unit power supply phase voltage < 165V. ...
  • Page 81 Procedure ODU power supply is abnormal or a Provide normal power supply phase is missing Wires between outdoor main PCB, AC filter boards and electric control box Ensure the wires are connected properly power supply terminals are loose High voltage circuit error has occurred, such as the compressor has malfunctioned , the fan motor has short-...
  • Page 82 2.5 E7: Temperature sensor (T7C1/2) error Digital display output Description  A compressor top temperature sensor or discharge pipe temperature sensor (T7C1/2) error.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition ...
  • Page 83 Procedure Temperature sensor connection on main Ensure the sensor is connected properly PCB is loose Temperature sensor has short-circuited Replace the sensor or failed Replace outdoor main PCB Notes: Compressor top temperature sensor and discharge pipe temperature sensor connections are ports CN4 and CN5 on the main PCB (labeled 3 and 4, respectively, in Figure 5-2.1 in Part 5, 2.1 “Ports”).
  • Page 84 2.6 E8: Outdoor unit address error Digital display output Description  Outdoor unit address error.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition  Trigger condition: Outdoor unit address is set more than 3. ...
  • Page 85 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 V6 Individual outdoor unit address should be set as 0.
  • Page 86 2.7 xE9: EEPROM mismatch Digital display output In the error code, 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. Description  1E9 indicates a compressor A EEPROM mismatch. ...
  • Page 87 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 88 2.8 xF1: DC bus voltage error Digital display output 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. Description  1F1 indicates compressor A DC bus voltage error; 2F1 indicates compressor B DC bus voltage error. ...
  • Page 89 Procedure...
  • Page 90 2.9 F3, F5: Temperature sensor (T6B/T6A) error Digital display output Description  F3 indicates plate heat exchanger cooling refrigerant outlet temperature sensor (T6B) error.  F5 indicates plate heat exchanger cooling refrigerant inlet temperature sensor (T6A) error.  All units stop running. ...
  • Page 91 Procedure F3 / F5 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: Plate heat exchanger cooling refrigerant inlet temperature sensor (T6A) and plate heat exchanger cooling refrigerant outlet temperature sensor (T6B) connection are port CN8 and CN8_1 on the main PCB (labeled 10 and 12, respectively, in Figure 5-2.1 in Part 5, 2.1 “Ports”).
  • Page 92 2.10 F6: Electronic expansion valve connection error Digital display output In the error code, 'x' is a placeholder for the EXV system, with 1 representing EXVA, 2 representing EXVB, and 3 representing EXVC. Description  Electronic expansion valve connection error. ...
  • Page 93 Procedure Electronic expansion valve coil Ensure the sensor is connected properly connection on main PCB is loose Electronic expansion valve coil has Replace the sensor malfunctioned Replace outdoor main PCB Notes: Electronic expansion valve coil connections are port CN70, CN71 and CN72 on the main PCB (labeled 18, 19 and 20, respectively, in Figure 5-2.1 in Part 5, 2.1 “Ports”).
  • Page 94 2.11 xH0: Communication error Digital display output In the error code, 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. Description  1H0 indicates a communication error between the main control chip and the compressor A inverter driver chip. ...
  • Page 95 Notes: Compressor inverter module address is set through dial switch S7 on the inverter module. The compressor inverter module A/B location refers to the wiring diagram. S7 on inverter module Inverter module address 0 for compressor inverter module A 1 for compressor inverter module B Communication wire from outdoor main PCB CN26 to inverter module CN8/CN9.
  • Page 96 2.12 xH4: Inverter module protection Digital display output In the error code, 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. Description  1H4 indicates compressor A inverter module protection. ...
  • Page 97 The specific error codes xL0, xL1, xL2 and xL4 can also be obtained from the inverter module LED indicators. If an inverter module error has occurred, LED2 is continuously on and LED1 flashes. Figure 6-2.4: LED indicators LED1 and LED2 on inverter module Table 5-3.2: Errors indicated on LED1 LED1 flashing pattern Corresponding error...
  • Page 98 L0: Inverter module protection 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...
  • Page 99 Note: 1. The normal DC voltage between terminals P and N on inverter module should be 450-650V. When the voltage is lower than 350V, L1 protection will be appeared. Figure 6-2.6: Inverter module terminals U V W...
  • Page 100 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 101 L4: MCE error Notes: Compressor inverter module address is set through dial switch S7 on the inverter module. The compressor inverter module A/B location refers to the wiring diagram. S7 on inverter module Inverter module address 0 for compressor inverter module A 1 for compressor inverter module B...
  • Page 102 L7: Phase sequence error...
  • Page 103 L8: Compressor frequency variation greater than 15Hz within one second protection L9: Actual compressor frequency differs from target frequency by more than 15Hz protection...
  • Page 104 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 105 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 V6 Engineering Data Book, Part 3. Figure 6-2.10: Inspecting compressor oil This oil is a little This oil is black yellow, but is clear...
  • Page 106 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 107 2.13 H7: Unmatched total number of indoor units Digital display output Description  Number of indoor units detected by the outdoor unit not same as number set on main PCB.  All units stop running.  Error code is displayed on the outdoor unit. Trigger / recover condition ...
  • Page 108 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 109 2.14 H8: High pressure sensor error Digital display output Description  High pressure sensor error.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition  Trigger condition: Discharge pressure ≤ 0.3MPa. ...
  • Page 110 Procedure High pressure sensor connection on main Ensure the sensor is connected properly PCB is loose High pressure sensor has short-circuited Replace the sensor or failed Insufficient refrigerant caused by Add refrigerant and inspect system for refrigerant leakage leaks The low pressure side is blocked, caused Inspect the system and fix the error.
  • Page 111 2.15 P1: Discharge pipe high pressure protection Digital display output Description  Discharge pipe high pressure protection. If the system has a 3-phase protector and the 3-phase protector is connected with the high pressure switch, the system will display P1 protection when initially powered on, and P1 protection will disappear once the system reaches a steady state.
  • Page 112 … flowchart continued from previous page Discharge part of the refrigerant. Add oil Excess refrigerant if it leaks during discharge Flush all refrigerant then vacuum the System contains air or nitrogen system and recharge the refrigerant. Add oil to the system if it leaks The high pressure side is blocked, caused Inspect the system and fix the error by crushed or bent pipe or blocked EXV...
  • Page 113 2.16 P2, H5: Suction pipe low pressure protection Digital display output Description  Suction pipe low pressure protection. If the system has a 3-phase protector and the 3-phase protector is connected to the low pressure switch, the system will display P2 protection when initially powered on, and P2 protection will disappear once the system reaches a steady state.
  • Page 114 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 115 2.17 xP3: Compressor current protection Digital display output 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. Description  1P3 indicates current protection on compressor A; 2P3 indicates current protection on compressor B. ...
  • Page 116 … 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 The high pressure side is blocked, caused...
  • Page 117 2.18 P4, H6: Discharge temperature protection Digital display output Description  Discharge temperature protection.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition  Trigger condition: For P4 protection: Discharge temperature (T7C1/2) ≥ 120 For H6 protection: P4 protection appears three times in 100 minutes.
  • Page 118 … 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 Make sure the combination ratio is less...
  • Page 119 2.19 P5: Outdoor heat exchanger temperature protection Digital display output Description  Outdoor heat exchanger temperature protection.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition  Trigger condition: Outdoor heat exchanger temperature (T3) ≥ 65 ...
  • Page 120 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% Flush all refrigerant then vacuum the...
  • Page 121 2.20 P9, H9: Fan module protection Digital display output Description  Fan module protection.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition  Trigger condition: For P9 protection: Fan speed is too low. For H9 protection: P9 protection appears ten times in 120 minutes.
  • Page 122 … flowchart continued from previous page Some power wires or communication Ensure power and communication wires wires of fan module are not connected are connected properly properly Remove obstruction or replace the fan The fan motor is blocked or has failed motor The power supply is abnormal Check the power supply equipment...
  • Page 123 2.21 PL, C7: Inverter module temperature protection Digital display output 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and 2 representing compressor system B. Description  1PL indicates inverter module A temperature protection. ...
  • Page 124 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 connection on main PCB is loose...
  • Page 125 2.22 PP: Compressor discharge insufficient superheat protection Digital display output Description  Compressor discharge insufficient superheat protection.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition  Trigger condition: Discharge gas superheat is ≤ 0 C for 20 minutes or ≤...
  • Page 126 Procedure Compressor top temperature sensor and/or discharge pipe temperature Ensure the sensors are connected sensor connections on main PCB are properly loose Compressor top temperature sensor and/or discharge pipe temperature Replace the faulty sensor(s) sensor have short circuited or failed Poor heat insulation of compressor top temperature sensor resulting in Ensure sufficient heat insulation for...
  • Page 127 3 Appendix to Part 6 3.1 Temperature Sensor Resistance Characteristics Table 6-3.1: Outdoor ambient temperature sensor and outdoor heat exchanger temperature sensor resistance characteristics Temperature Resistance Temperature Resistance Temperature Resistance Temperature Resistance (°C) (kΩ) (°C) (kΩ) (°C) (kΩ) (°C) (kΩ) 115.3 12.64 2.358...
  • Page 128 Table 6-3.2: Compressor top temperature sensor and discharge pipe temperature sensor resistance characteristics Temperature Temperature Temperature Temperature Resistance Resistance Resistance Resistance (kΩ) (kΩ) (kΩ) (kΩ) (°C) (°C) (°C) (°C) 542.7 68.66 13.59 3.702 511.9 65.62 13.11 3.595 483.0 62.73 12.65 3.492 455.9 59.98...
  • Page 129 Table 6-3.3: Inverter module temperature sensor resistance characteristics Temperature Temperature Temperature Temperature Resistance Resistance Resistance Resistance (kΩ) (kΩ) (kΩ) (kΩ) (°C) (°C) (°C) (°C) 971.4 109.0 19.70 5.000 912.8 103.9 18.97 4.855 858.2 99.02 18.26 4.705 807.3 94.44 17.59 4.566 759.7 90.11 16.94...
  • Page 130 3.2 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 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. ...

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