Trane TVR Pro CO Series Service Manual
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Trane TVR Pro CO Series Service Manual

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Service Manual
TVR Pro CO Series
4TVY0077HE000AA
4TVY0096HE000AA
4TVY0115HE000AA
4TVY0140HE000AA
4TVY0155HE000AA
4TVY0170HE000AA
Commercial Air Conditioners
4TVY0192HE000AA
4TVY0210HE000AA
4TVY0229HE000AA
4TVY0249HE000AA
4TVY0268HE000AA
4TVY0290HE000AA
R410A

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  • Page 1 R410A Commercial Air Conditioners Service Manual TVR Pro CO Series 4TVY0077HE000AA 4TVY0192HE000AA 4TVY0096HE000AA 4TVY0210HE000AA 4TVY0115HE000AA 4TVY0229HE000AA 4TVY0140HE000AA 4TVY0249HE000AA 4TVY0155HE000AA 4TVY0268HE000AA 4TVY0170HE000AA 4TVY0290HE000AA...
  • Page 2 CONTENTS Part 1 General Information ................3 Part 2 Component Layout and Refrigerant Circuits ........12 Part 3 Control ....................24 Part 4 Field Settings ..................35 Part 5 Electrical Components and Wiring Diagrams ........39 Part 6 Diagnosis and Troubleshooting ............54...
  • Page 4 Part 1 General Information Indoor and Outdoor Unit Capacities ............4 External Appearance................6 Outdoor Unit Combinations ..............8 Nomenclature ..................10...

  • 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 Floor Standing Medium Static Pressure Duct...
  • Page 6 1.3 Outdoor Units Table 1-1.5: Outdoor unit capacity range Capacity Model Name Combination Type 4TVY0077HE000AA 4TVY0096HE000AA 10HP 4TVY0115HE000AA 12HP 4TVY0140HE000AA 14HP 4TVY0155HE000AA 16HP 4TVY0170HE000AA 18HP 4TVY0192HE000AA 20HP 4TVY0210HE000AA 22HP 4TVY0229HE000AA 24HP 4TVY0249HE000AA 26HP 4TVY0268HE000AA 28HP 4TVY0290HE000AA 30HP 4TVY0310HE000AA 32HP 16HP+16HP 4TVY0325HE000AA 34HP 22HP+12HP...

  • Page 7: External Appearance

    2 External Appearance 2.1 Indoor Units 2.1.1 Standard indoor unit 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 2.1.2 Fresh air processing unit Table 1-2.2: Fresh air processing unit appearance Fresh Air Processing Unit 2.2 Heat Recovery Ventilator...
  • Page 8 2.3 Outdoor Units 2.3.1 Single units Table 1-2.4: Single outdoor unit appearance 8/10/12/14/16HP 18/20/22HP 24/26/28/30 (with single fan) (with dual fans) (with dual fans) 2.3.2 Combinations of units Table 1-2.5: Combination outdoor unit appearance 32HP 34/36/38/HP 40/42/44/46HP 48/50/52HP 54/56/58/60HP 62HP 64/66/68HP 70/72/74/76HP...

  • Page 9: Outdoor Unit Combinations

    Table continued on next page… Table 1-2.5: Combination outdoor unit appearance 78/80/82HP 84/86/88/90HP 3 Outdoor Unit Combinations Table 1-3.1: Outdoor unit combinations System capacity Number Modules Outdoor branch of units joint kit 22.4 ● 28.0 ● 33.5 ● 40.0 ● 45.0 ●...
  • Page 10 Table continued on next page… Table 1-3.1: Outdoor unit combinations Number Outdoor branch System capacity Modules of units joint kit 242.0 ●● ● 248.5 ● ●● TODK03UTHP 255.0 ●●● Notes: The combinations of units shown in the table are factory-recommended. Other combinations of units are also possible. For systems with two or more outdoor units, outdoor branch joints (sold separately) are required.

  • Page 11: 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 12 4.2 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 4.3 Outdoor Units 4 T V Y 0...
  • Page 13 Part 2 Component Layout and Refrigerant Circuits Layout of Functional Components ............13 Piping Diagrams .................. 16 Refrigerant Flow Diagrams ..............20...
  • Page 14 1 Layout of Functional Components 8-16HP Figure 2-1.1: 8-16HP layout of functional components Legend Parts name Compressor Discharge temperature sensor High pressure sensor Oil separator Heat exchanger Electronic expansion valve (EXV) Fan motor Stop valve (liquid side) Stop valve (gas side) Accumulator Low pressure switch Solenoid valve...
  • Page 15 18-22HP Figure 2-1.2: 18-22HP layout of functional components Legend Parts name Compressor Discharge temperature sensor High pressure sensor Oil separator Heat exchanger Electronic expansion valve (EXV) Fan motor Stop valve (liquid side) Stop valve (gas side) Accumulator Low pressure switch Solenoid valve 9 10...
  • Page 16 24-30HP Figure 2-1.3: 24-30HP layout of functional components Legend Parts name Compressor Discharge temperature sensor High pressure sensor Oil separator Heat exchanger Electronic expansion valve (EXV) Fan motor Stop valve (liquid side) Stop valve (gas side) Accumulator Low pressure switch Solenoid valve 9 10...
  • Page 17 2 Piping Diagrams 8-16HP Figure 2-2.1: 8-16HP piping diagram EXVA °C °C Legend Parts name Parts name Compressor Stop valve (gas side) Discharge temperature sensor Accumulator High pressure sensor Low pressure switch Oil separator Solenoid valve Heat exchanger Heat exchanger temperature sensor Electronic expansion valve (EXV) Outdoor ambient temperature sensor Fan motor...
  • Page 18 18-22HP Figure 2-2.2: 18-22HP piping diagram EXVA °C °C Legend Parts name Parts name Compressor Stop valve (gas side) Discharge temperature sensor Accumulator High pressure sensor Low pressure switch Oil separator Solenoid valve Heat exchanger Heat exchanger temperature sensor Electronic expansion valve (EXV) Outdoor ambient temperature sensor Fan motor Liquid injection valve...
  • Page 19 24-30HP Figure 2-2.3: 24-30HP piping diagram EXVA °C °C Legend Parts name Parts name Compressor Stop valve (gas side) Discharge temperature sensor Accumulator High pressure sensor Low pressure switch Oil separator Solenoid valve Heat exchanger Heat exchanger temperature sensor Electronic expansion valve (EXV) Outdoor ambient temperature sensor Fan motor Liquid injection valve...
  • Page 20 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 21 3 Refrigerant Flow Diagrams 8-16HP Cooling operation Figure 2-3.1: 8-16HP refrigerant flow during cooling operation Unit on Thermostat on High temperature, high pressure gas High temperature, high pressure liquid Filter Filter Low temperature, low pressure Normal control EXVA Unit on XX°C Thermostat on XX°C...
  • Page 22 18-22HP Cooling operation Figure 2-3.3: 18-22HP refrigerant flow during cooling operation Unit on High temperature, high pressure gas Thermostat on High temperature, high pressure liquid Filter Filter Low temperature, low pressure Normal control EXVA Unit on XX°C Thermostat on XX°C Filter Filter Normal control...
  • Page 23 24-30HP Cooling operation Figure 2-3.5: 24-30HP refrigerant flow during cooling operation Unit on High temperature, high pressure gas Thermostat on High temperature, high pressure liquid Filter Filter Low temperature, low pressure Normal control EXVA XX°C Unit on Thermostat on XX°C Filter Filter Normal control...

  • Page 25: Table Of Contents

    Part 3 Control 1 General Control Scheme Flowchart ............25 2 Stop Operation ..................26 3 Startup Control ..................26 4 Normal Operation Control ................ 27 5 Protection Control ..................30 6 Special Control ..................32...

  • Page 26: General Control Scheme Flowchart

    1 General Control Scheme Flowchart Sections 3-2 to 3-6 on the following pages detail when each of the controls in the flowchart below is activated. Stop operation  Abnormal shutdown  System stops Special control  A unit stops when the load demanded decreases Thermo on Startup control Thermo on...

  • Page 27: 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 28: Normal Operation Control

    4 Normal Operation Control 4.1 Component Control during Normal Operation Table 3-4.1: Component control during normal cooling operation Wiring diagram Component 8-12HP 14-16HP 18-22HP 24-30HP Control functions and states label Inverter compressor A ● ● ● ● Controlled according to load requirement Inverter compressor B ●...
  • Page 29 Figure 3-4.1: Compressor priority and rotation – one outdoor unit No. 1 No. 1 No. 2 Figure 3-4.2: Compressor priority and rotation – two outdoor units ① No. 1 No. 2 No. 3 No. 4 No. 1 No. 2 No. 1 No.
  • Page 30 fully closed.  When all outdoor units are running:  All EXVAs are controlled according to discharge temperature. 4.6 Outdoor Fan Control The speed of the outdoor unit fans is adjusted in steps, as shown in Table 3-4.2. Table 3-4.2: Outdoor fan speed steps Fan speed (rpm) Fan speed index 18-22HP...

  • Page 31: Protection Control

    5 Protection Control 5.1 High Pressure Protection Control This control protects the system from abnormally high pressure and protects the compressors from transient spikes in pressure. Figure 3-5.1: High pressure protection control Normal operation > 4.4MPa < 3.2MPa High pressure protection, error code P1 is displayed Notes: : Discharge pressure 5.2 Low Pressure Protection Control...
  • Page 32 high temperatures. It is performed for each compressor and inverter module. Figure 3-5.4: Compressor current protection control Normal operation Current ≥ Current Current < Current Compressor current protection, error code xH4(xL0) is displayed Compressor model LNB53 LNB65 Current 48.5 Figure 3-5.5: Inverter module temperature protection control Normal operation >...

  • Page 33: Special Control

    6 Special Control 6.1 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:  After oil return operation. ...
  • Page 34 6.2 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 35 Part 4 Field Settings Outdoor Unit Field Settings ..............35...
  • Page 36 1 Outdoor Unit Field Settings 1.1 PCB Switches and Switch Settings Figure 4-1.1: Outdoor unit main PCB switches Table 4-1.1: Outdoor unit main PCB switch settings Switch Setting Switch positions Description Reserved Reserved Reserved S6-1 No action (default) Clear indoor unit addresses S6-2 Clear indoor unit addresses...
  • Page 37 Table 4-1.1: Outdoor unit main PCB switch settings (continued) Switch Setting Switch positions Description The number of indoor units is in the range 0-15 0-9 on ENC3 indicate 0-9 indoor units; A-F on ENC3 indicate 10-15 indoor units The number of indoor units is in the range 16-31 0-9 on ENC3 indicate 16-25 indoor units;...
  • Page 38 1.2 Modes Set on Main PCB 1.2.1 Silent time setting 1.2.1.1 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 39 1.2.1.2 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 40 Part 5 Electrical Components and Wiring Diagrams 1 Outdoor Unit Electric Control Box Layout ..........40 2 Outdoor Unit Main PCB ................. 42 3 Wiring Diagrams ..................51...
  • Page 41 1 Outdoor Unit Electric Control Box Layout 8-16HP Figure 5-1.1: 8-16HP top layer of electric control box Figure 5-1.2: 8-16HP bottom layer of electric control box...
  • Page 42 18-30HP Figure 5-1.3: 18-30HP top layer of electric control box Figure 5-1.4: 18-30HP bottom layer of electric control box...
  • Page 43 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 44 Table 5-2.1: Main PCB ports Label Port code Content Port voltage CN18 Reserved 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 Discharge pipe temperature sensor (single compressor units) or compressor B compressor top temperature sensor (dual 0-5V DC (varying)
  • Page 45 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 46 Menu mode Only master unit has the full menu functions, slaves 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. Press SW3 / SW4 “UP / DOWN” button to select the first level menu “n1”, “n2”, “n3”, “n4”or “nb”; 3.
  • Page 47 Menu mode function: Table 5-2.3: Menu mode function Digital display Menu mode Remarks content Debug mode Only available for the master unit (all indoor units running in cooling mode) Maintenance mode Only available for the master unit, the system does not check the indoor units’ number. Reserved Reserved Only available for outdoor unit with two compressors.
  • Page 48 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 After running 120 minutes Invalid display is not in menu selection state Maintenance mode After running 60 minutes Invalid...
  • Page 49 Table 5-2.5: System check (continued) DSP1 Parameters displayed on DSP2 Remarks content 34.-- Address of VIP indoor unit 35.-- Reserved 36.-- Reserved 37.-- Refrigerant quantity Refer to Note 7 38.-- Reserved 39.-- Power mode Refer to Note 8 “--“ is displayed if no error or protection events 40.-- Most recent error or protection code have occurred since start-up...
  • Page 50 3 Compressor Inverter Module 3.1 Ports Figure 5-3.1: Compressor inverter module ports Table 5-3.1: Compressor inverter module PCB ports Label Port code Content Port voltage CN6\CN7\CN11 3-phase power supply port to inverter module 380V AC CN12\CN13\CN14 Inverter module power output port to compressor U V W CN20 Fan module power output port 18-22V DC...
  • Page 51 3.2 Layout Figure 5-3.2: Compressor inverter module components LED indicators LED1 and LED2 Table 5-3.2: 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 Inverter module error indicator.
  • Page 52 4 Fan Module 4.1 Ports Figure 5-4.1: Fan module ports Table 5-4.1: Fan module PCB ports Label in Port code Content Port voltage Power supply port to fan module control part 18-22V DC Power supply port to fan module control part 18-22V DC Program upgrade port Communication port to main board...
  • Page 53 5 Wiring Diagrams 8-16HP Figure 5-5.1: 8-16HP wiring diagram T7C1 O-FAN H-PRO CN18 CN26 CN27 EEVA N-ON L-PRO H-YL1 T4 T3 CN70 CN82 CN19 CN17 CN2(CN3)
  • Page 54 18-30HP Figure 5-5.2: 18-30HP wiring diagram CN2(CN3) T7C1 T7C2 O-FAN H-PRO CN26 CN27 CN18 EEVA N-ON L-PRO H-YL1 T4 T3 CN70 CN82 CN13 CN17 CN19 CN2(CN3)
  • Page 55 Part 6 Diagnosis and Troubleshooting 1 Error Code Table ..................55 2 Troubleshooting ..................56 3 Appendix to Part 6 ................107...
  • Page 56 1 Error Code Table Table 6-1.1: Error code table Error Manual re-start Content Remarks code required Only displayed on the slave unit Communication error between outdoor units with the error Communication error between indoor and master unit Only displayed on the master unit Outdoor heat exchanger temperature sensor (T3) error or Displayed on the unit with the error outdoor ambient temperature sensor (T4) error...
  • Page 57 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 58 2.2 E0: Communication error between outdoor units Digital display output Description  Communication error between outdoor units.  All units stop running.  Error code is only displayed on the slave unit with the error. Trigger / recover condition  Trigger condition: Slave unit cannot receive signal from master unit for 60s. ...
  • Page 59 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 60 2.3 E2: Communication error between indoor and master unit Digital display output Description  Communication error between indoor and master unit.  All units stop running.  Error code is only displayed on the master unit. Trigger / recover condition ...
  • Page 61 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 62 2.4 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 63 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 64 2.5 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 65 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...
  • Page 66 2.6 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 67 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 68 2.7 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 2. ...
  • Page 69 Procedure The ODU's address is not in the valid Slave units addresses should be set from range 1 to 2 Replace the outdoor main PCB Notes: The master unit address should be set as 0, slave units addresses should be set from 1 to 2, and the addresses should not be repeated within one system.
  • Page 70 2.8 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 71 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 72 2.9 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 73 2.10 F6: Electronic expansion valve connection error Digital display output Description  Electronic expansion valve connection error.  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition  Trigger condition: The main control board cannot receive the feedback signal of EXV. ...
  • Page 74 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 is port CN70 on the main PCB (labeled 19 in Figure 5-2.1 in Part 5, 2.1 “Ports”). The normal resistances between EXV coil wiring terminals RED and white / yellow / orange / blue are 40-50Ω.
  • Page 75 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 76 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 77 2.12 H2, H3: Slave units decreased/increased Digital display output 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 78 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: See “E0 Troubleshooting”.
  • Page 79 2.13 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 80 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: LED indicators LED1 and LED2 on inverter module Table 5-3.2: Errors indicated on LED1 LED1 flashing pattern Corresponding error...
  • Page 81 L0: Inverter module protection L0 protection The compressor wiring is connected Reconnect the cables incorrectly based on wiring diagram The resistance between 3 phases of Disconnect compressor is over 5? the power supply Replace the compressor The insulation resistance of compressor is less than 100k? The inverter module is not well heat Fasten IPM...
  • Page 82 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: 1.
  • Page 83 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 84 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 85 L7: Phase sequence error...
  • Page 86 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 87 Compressor replacement procedure 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 88 2.14 H7: Unmatched total number of indoor units Digital display output 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. Trigger / recover condition ...
  • Page 89 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 90 2.15 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 91 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 92 2.16 yHd: Slave unit malfunction Digital display output In the error code, 'y' is a placeholder for the address (1 or 2) of the slave unit with the error. Description  1Hd indicates an error on the slave unit with address 1. ...
  • Page 93 Procedure Check relevant slave unit...
  • Page 94 2.17 P1: Discharge pipe high pressure protection Digital display output Description  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition  Trigger condition: Discharge pressure ≥ 4.3MPa.  Recover condition: Discharge pressure ≤ 4.0MPa for 2 minutes. ...
  • Page 95 … 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 96 2.18 P2, H5: Suction pipe low pressure protection Digital display output Description  All units stop running.  Error code is only displayed on the unit with the error. Trigger / recover condition  Trigger condition: For P2 protection: Suction pressure ≤ 0.05MPa. For H5 protection: P2 protection appears three times in 60 minutes.
  • Page 97 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 98 2.19 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 99 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 The indoor load is too large...
  • Page 100 2.20 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 101 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 102 2.21 xP9, xH9: Fan module protection Digital display output 'x' is a placeholder for the fan motor system (fan motor and related electrical components), with 1 representing fan motor system A and 2 representing fan motor system B. Description  Fan module protection. ...
  • Page 103 … flowchart continued from previous page 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 Voltage between P and N on fan module Replace AC filter board is abnormal Replacing the fan module resolves the error...
  • Page 104 2.22 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 105 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 106 2.23 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 107 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 108 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 109 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 110 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 111 3.2 Normal Operating Parameters of Refrigerant System Under the following conditions, the operating parameters given in Tables 6-3.4 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. ...

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