Sinclair SCV-750EB Service Manual
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Sinclair SCV-750EB Service Manual

Air-cooled modular chiller unit
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AIR-COOLED
MODULAR CHILLER UNIT
SERVICE MANUAL
SCV- 750
EB
SCV- 900
EB
SCV- 1400
EB
SCV-1800EB
AIR CONDITIONING

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Summary of Contents for Sinclair SCV-750EB

  • Page 1 AIR-COOLED MODULAR CHILLER UNIT SERVICE MANUAL SCV- 750 SCV- 900 SCV- 1400 SCV-1800EB AIR CONDITIONING...
  • Page 3 CONTENTS Part 1 General Information ................3 Part 2 Component Layout and Refrigerant Circuits ........7 Part 3 Control ....................25 Part 4 Diagnosis and Troubleshooting ............43...

  • Page 5: Part 1 General Information

    Part 1 General Information Unit Capacities and External Appearance..........4 Water outlet temperature range ............4...
  • Page 6 1 Unit Capacities and External Appearance Model SCV-750EB SCV-900EB SCV-1400EB SCV-1800EB Power 380-415V/3Ph/50Hz 380-415V/3Ph/50Hz 380-415V/3Ph/50Hz 380-415V/3Ph/50Hz supply Appearance 2 Water outlet temperature range 2.1 Cooling operating range ② ① Outlet water temperature ( ℃ ) Notes: ① Normal mode ② Low leaving water temperature mode Low leaving water temperature mode can be set through wired controller, please refer to the Operation Manual for details.
  • Page 7 2.2 Heating operating range SCV-750EB, SCV-1400EB SCV-900EB, SCV-1800EB HEATING Outlet water temperature ( ℃ ) Outlet water temperature ( ℃ )

  • Page 9: Part 2 Component Layout And Refrigerant Circuits

    Part 2 Component Layout and Refrigerant Circuits 1 Layout of Functional Components .............. 8 2 Piping Diagrams ..................12 3 Refrigerant Flow Diagrams ............... 21...
  • Page 10 1 Layout of Functional Components Component list of SCV-750EB Axial fan Plate heating exchanger Four-way valve Brushless DC Motor Flow switch Plate heating exchanger Condenser Safety valve (Refrigerant side) Oil separator Exhaust valve Gas-liquid separator DC inverter scroll compressor Safety valve (Water side)
  • Page 11 Component list of SCV-900EB Compressor 1 Filter Liquid storage tank Compressor 2 One-way valve Solenoid valve suit Vapor injection solenoid valve 1 Electronic expansion valve Pressure sensor Vapor injection solenoid valve 2 Plate heating exchanger Safety valve High pressure switch Electionic expansion valve Gas-liquid separator Filter...
  • Page 12 Component list of SCV-1400EB DC inverter compressor 1 Condenser Electronic expansion valve DC inverter compressor 2 Electronic expansion valve Gas-liquid separator Oil seperator Brazing plates heating exchanger Plate heat exchanger 4-way valve Electronic expansion valve...
  • Page 13 Component list of SCV-1800EB DC inverter compressor 1 Filter Single pass solenoid valve suit DC inverter compressor 2 One-way valve Pressure sensor Enhanced vapor injection solenoid valve 1 Electronic expansion valve Safety valve Enhanced vapor injection solenoid valve 2 Brazing plates heating exchanger Gas-liquid separator High pressure switch Electionic expansion valve...
  • Page 14 2 Piping Diagrams SCV-750EB Legend Crankcase heater Solenoid valve DC inverter compressor Vapor-liquid separator Discharge temperature sensor 1 Filter Discharge temperature switch 1 Suction temperature sensor High pressure switch Low pressure sensor High pressure sensor Low pressure switch Pin valve (Discharge side)
  • Page 15 Key components: 1. Compressor: Maintains pressure differential between high and low pressure sides of the refrigerant system. 2. Fan: Ventilates the air side heat exchanger. 3. Air side heat exchanger: In the cooling mode, the heat of the refrigerant from the water side heat exchanger can be released into the air. In the heating mode, the refrigerant can absorb the heat in the air and provide it to the water side heat exchanger.
  • Page 16 Prevents excessive refrigerant pressure by opening at 42bar and discharging refrigerant from the refrigerant system. 21. Crankcase heater: Prevents refrigerant from mixing with compressor oil when the compressors are stopped. 22. Water side heat exchanger electric heater: Protects the water side heat exchanger from ice formation. 23.
  • Page 17 SCV-900EB Legend Crankcase heater 1 System pressure sensor Crankcase heater 2 Solenoid valve DC inverter compressor 1 Vapor-liquid separator DC inverter compressor 2 Pin valve (Suction side) Discharge temperature sensor 1 Suction temperature sensor Discharge temperature sensor 2 Low pressure switch Discharge temperature switch 1 Fast oil return solenoid valve Discharge temperature switch 2...
  • Page 18 Key components: 1. Compressor Maintains pressure differential between high and low pressure sides of the refrigerant system. 2. Fan: Ventilates the air side heat exchanger. 3. 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%.
  • Page 19 21. Solenoid valve SV6(by pass): Increase refrigerant flow. 22. Solenoid valve SV8A, SV8B(injection): Enhance enthalpy and capacity.
  • Page 20 SCV-1400EB 16m m inlet EXVA Taf1 EXVC Taf2 outlet EXVB W-Heat Legend Crankcase heater 1 Filter Crankcase heater 2 Plate heat exchanger DC inverter compressor 1 Solenoid valve DC inverter compressor 2 Pin valve (Suction side) Discharge temperature sensor 1 Safety valve Discharge temperature sensor 2 Vapor-liquid separator...
  • Page 21 Key components: 1. Compressor Maintains pressure differential between high and low pressure sides of the refrigerant system. 2. Fan: Ventilates the air side heat exchanger. 3. Air side heat exchanger: In the cooling mode, the heat of the refrigerant from the water side heat exchanger can be released into the air. In the heating mode, the refrigerant can absorb the heat in the air and provide it to the water side heat exchanger.
  • Page 22 24. Pressure gauge joint (high and low pressure side): Charges or discharges refrigerant. 25. Capillary: Normally return oil to the compressor. 26. Wired Controller: Control and query the operation status of the unit. SCV-1800EB The piping diagrams is the same as SCV-900EB. SCV-1800EB system consists of two independent SCV-900EB systems.
  • Page 23 3 Refrigerant Flow Diagrams SCV-750EB High temperature, high press gas High temperature, high press liquid Low temperature, low press Heating operation inlet outlet Cooling and defrosting operation inlet outlet...
  • Page 24 SCV-900EB High temperature, high press gas High temperature, high press liquid Low temperature, low press Heating operation Cooling and defrosting operation...
  • Page 25 SCV-1400EB High temperature, high press gas High temperature, high press liquid Low temperature, low press Heating operation inlet outlet Cooling and defrosting operation inlet outlet SCV-1800EB The refrigerant flow diagrams is same as SCV-900EB. SCV-1800EB system consists of two independent SCV-900EB systems.

  • Page 27: Table Of Contents

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

  • Page 28: General Control Scheme Flowchart

    1 General Control Scheme Flowchart Stop operation  Abnormal shutdown  System stops Standby control  Crankcase heater control  Water pump control Special control Startup control  Compressor startup delay control  Startup control for heating operation  Startup control for cooling operation ...

  • Page 29: Stop Operation

    2 Stop Operation The stop operation occurs for one of the 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’s PCB digital displays and on the user interface. 2.

  • Page 30: Startup Control

    Electric auxiliary heater (pipe) temperature. Controlled according to ambient temperature and discharge ● Crank case heater temperature. For SCV-750EB and SCV-1400EB: 75kW 140kW Control functions and states Component Wiring diagram label Non-standard component: After the pump is turned on for 2 minutes, detect the water flow switch continuously.
  • Page 31 ● ● Open Four-way valve ● ● Closed Solenoid valve (defrost) ● ● Closed Solenoid valve (by pass) ● ● SV8A/B Open Solenoid valve (injection) After water pump (field supplied) is turned on for 2min, if water flow switch is open, water pump stops and water ●...
  • Page 32 For SCV-750EB and SCV-1400EB: 75kW 140kW Control functions and states Component Wiring diagram label Non-standard component: After the pump is turned on for 2 minutes, detect the water flow switch continuously. The ● ● Water pump PUMP compressor can be started only after the water flow is normal.

  • Page 33: Normal Operation Control

    Controlled according to ambient temperature and total water ● (pipe) outlet temperature. Controlled according to ambient temperature and discharge ● Crank case heater temperature. For SCV-750EB and SCV-1400EB: Wiring 75kW 140kW Control functions and states Component diagram label ● ●...
  • Page 34 Controlled according to ambient temperature, water inlet ● Water flow switch heater temperature and water outlet temperature. Controlled according to ambient temperature and discharge ● Crank case heater temperature. For SCV-750EB and SCV-1400EB: 75kW 140kW Control functions and states Component Wiring diagram label ● ●...
  • Page 35 Step from 0 to 480. Controlled according to discharge ● ● EXV-B Electronic expansion valve temperature superheat. Enhanced vapor injection EXV, Step from 0 to 480. Controlled according to temperature difference ● ● EXV-C Electronic expansion valve between economizer plate heat exchanger inlet and outlet.
  • Page 36 When the outdoor unit stops: After the compressor shuts down for 1 minute, the EXV is fully closed first, and then opened to the initial position. 5.7 Outdoor Fan Control For SCV-750EB: Fan speed (rpm) Fan speed index FAN A...
  • Page 37 For SCV-900EB and SCV-1800EB: Fan speed (rpm) Fan speed index FAN A FAN B...
  • Page 38 For SCV-1400EB: Fan speed (rpm) Fan speed index FAN A FAN B...

  • Page 39: Protection Control

    6 Protection Control 6.1 High Pressure Protection Control This control protects the refrigerant system from abnormally high pressure and protects the compressor from transient spikes in pressure. Normal operation > 4.2MPa < 3.2MPa When P0 protection occurs 3 times in 60 minutes, a manual system restart is High pressure protection, error code P0 is displayed required before the system can...
  • Page 40 6.4 Compressor and Inverter Module Protection Control For SCV-750EB and SCV-1400EB: The protection current for SCV-750EB is 54A, for SCV-750EB is 106A. Normal operation Current > protection current Current < protection current CL is displayed when PL error occurs 3...
  • Page 41 6.5 Voltage Protection Control This control protects the units from abnormally high or abnormally low voltages. Normal operation Voltage ≥ 265V Voltage < 250V or Voltage ≤ 170V or Voltage ≥ 180V Compressor voltage protection, error code H5 is displayed When the phase voltage of AC power supply is at or above 265V for more than 30 seconds, the system displays H5 protection and all the units stop running.
  • Page 42 6.9 Water Side Heat Exchanger Temperature Difference Protection Control Normal operation ∣Twi-Two∣≥ 10°C ∣Twi-Two∣≤ 6°C Temperature difference protection, error code P9 is displayed Notes: Twi: Water side heat exchanger inlet temperature; Two: Water side heat exchanger outlet temperature. When the temperature difference rises at or above 10°C, the system displays P9 protection and all the units stop running. When the temperature difference drops below 6°C, the compressor enters re-start control.

  • Page 43: Special Control

    7 Special Control 7.1 Outdoor Unit Duty Cycling In systems with multiple outdoor units, outdoor unit duty cycling is used to balance the compressor running time. Outdoor unit duty cycling occurs whenever all the outdoor units stop running (either because the leaving water set temperature has been reached or because a master unit error has occurred): Take 16 units in parallel as an example: ...
  • Page 44  Wire connection: Shorting the terminal block CN110 at slave board (Refer to the Part 4, 3.1 Single unit) for SCV-750EB and SCV-1400EB.Connect a switch between 20 and 25 terminals of block XT2 (Refer to the Part 4, 3.1 Single unit) for SCV-900EB and SCV-1800EB.If the switch is off, unit operates at first target water temperature.

  • Page 45: Part 4 Diagnosis And Troubleshooting

    Part 4 Diagnosis and Troubleshooting 1 Electric Control Box Layout ............... 44 2 PCB Introduction ..................46 3 Wiring diagram ..................59 4 Error Code Table ..................66 5 Troubleshooting ..................68 6 Drive Module Failure ................139 7 Appendix ....................152...

  • Page 46: Electric Control Box Layout

    1 Electric Control Box Layout For SCV-750EB For SCV-1400EB...
  • Page 47 Fan module A Fan module B Connection terminal Power supply Electric control box side view-bottom layer  Compressor Inverter module A Compressor Inverter module B Reactor Reactor PED board PED board Sinclair electric control side view  For SCV-1800EB only...

  • Page 48: Pcb Introduction

    Aqua thermal 180kw unit have two main control board, four compressor inverter module board, four DC fan inverter module board and two filter board. 2.2 Main PCB Main PCB component For SCV-750EB and SCV-1400EB Label Code Port Explanation...
  • Page 49 CN75/CN66 EVA-HEAT Plate heat exchanger electric heating belt 220-240V CN48 Four-way valve 220-240V CN47 One-way solenoid valve 220-240V CN49 One-way solenoid valve 220-240V CN84 SV8A One-way solenoid valve 220-240V CN83 SV8B One-way solenoid valve 220-240V CN93 ALARM Fault alarm port CN65 USB program burning port DC5V...
  • Page 50 S3-1 1 (Default) DC3.3V SCV-750EB：0011； Ability dial DC3.3V SCV-1400EB：0111 For SCV-900EB and SCV-1800EB 30 29 28 27 26 25 24 23 22 21 20 19 18 Label Code Port Voltage CN30 Power supply port/ sequence detection port 400VAC CN12 Quick oil return solenoid valve...
  • Page 51 CN71 System electronic expansion valve(For cooling) DC12V CN72 Electronic expansion valve(For EVI) DC12V CN70 System electronic expansion valve1 DC12V CN60 Outdoor units communication or HMI communication port DC5V CN61 Outdoor units communication or HMI communication port DC5V CN64 Fan inverter module communication port DC5V CN65 Compressor inverter module communication port...
  • Page 52 Multiple water pumps control, valid for S12-2 ON。 Main PCB field setting Multiple pumps control: output pump signal on all units. Single pump control: only the master unit output pump signal, no pump signal output on the slave units. SCV-750EB and SCV-1400EB Default factory Switch Description...
  • Page 53 Connect a switch between 14 and 23 terminals of block XT2 (Refer to the Part 4, 3.1 Single unit) which can change operation mode at any time. If the switch is closed, unit runs in heating mode. If the switch is open, unit runs in cooling mode. Digital display output For SCV-750EB, SCV-900EB and SCV-1400EB: Outdoor unit state Parameters displayed on DSP1...
  • Page 54 2.3 Compressor Inverter Module Board Compressor Inverter Module PCB component For SCV-750EB and SCV-1400EB Label Code Port Explanation Voltage P-in Reactor output port P-out Reactor input port CN16 Power supply for module board 380-415V CN15 CN17 CN18 Compressor output CN19...
  • Page 55 For SCV-900EB and SCV-1800EB: Label Code Port Voltage DC565V Reactor output port 400VAC Three-phase power supply in (L1) DC565V Reactor input port 400VAC Three-phase power supply in (L2) CN11 400VAC Three-phase power supply in (L3) CN12 Compressor connection port U VUV=VUW=VVW CN13 Compressor connection port V...
  • Page 56 CN38 DC565V Power supply for fan module board IC25 DC5V EEPROM Compressor Inverter Module PCB field setting Switch Description S7-1 S7-2 Compressor A inverter module address setting Compressor B inverter module address setting...
  • Page 57 2.4 Fan Module Board Fan Module Board component For SCV-750EB and SCV-1400EB Label Code Port Explanation Voltage Fan module control power supply output port DC19V CN12 Reserve Fan module address setting CN1/CN4 Fan module communication port DC5V DEBUG Program burn port (WizPro200RS programmer)
  • Page 58 Fan Module PCB field setting Switch Description S1-1 S1-2 Fan A inverter module address setting Fan B inverter module address setting 2.5 AC Filter Board For SCV-750EB and SCV-1400EB Label Code Port Explanation Voltage Input port L1 Input port L2...
  • Page 59 For SCV-900EB and SCV-1800EB Label Code Port Voltage 400VAC Input port N 400VAC Input port L3 400VAC Input port L2 400VAC Input port L1 CN30 DC12V Relay driver signal for compressor from main PCB CN36 230VAC Power supply for compressor inverter module Power supply port for main PCB/Three phase sequence CN13 230VAC...
  • Page 60 Label Code Port Explanation Voltage CN26 For connecting compressor module board CN27 For connecting compressor module board 2.7 Slave PCB Board For SCV-750EB and SCV-1400EB only: Label Code Port Explanation Voltage CN140 POWER Slave PCB board strong power supply 220-240V...

  • Page 61: Wiring Diagram

    3 Wiring diagram 3.1 Single unit For SCV-750EB and SCV-1400EB...
  • Page 62 For SCV-900EB:...
  • Page 63 For SCV-1800EB:...
  • Page 64 3.2 Multiple units For SCV-750EB: CN46 CN46 CN46...
  • Page 65 For SCV-900EB:...
  • Page 66 For SCV-1400EB: CN46 CN46 CN46...
  • Page 67 SCV-1800EB:...

  • Page 68: Error Code Table

    4 Error Code Table Code Content Remarks Main control EPROM error Displayed on main PCB and user interface Phase sequence failure of main control board check Displayed on main PCB and user interface Main control and wired control transmission error Displayed on main PCB and user interface Communication failure between master and slave Total water outlet temperature sensor error (valid for the main unit)
  • Page 69 Continued: Code Content Remarks 1PU DC fan A module protection Displayed on main PCB and user interface 2PU DC fan B module protection Displayed on main PCB and user interface 1H9 Compressor A inverter module is not matched Displayed on main PCB and user interface 2H9 Compressor A inverter module is not matched Displayed on main PCB and user interface High pressure sensor error...

  • Page 70: Troubleshooting

    5 Troubleshooting 5.1 Warning Warning All electrical work must be carried out by competent and suitably qualified, certified and 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 71 5.2 E0/H9 Troubleshooting Digital display output Description For SCV-750EB and SCV-1400EB E0 indicates that the capability dialing code of the main PCB is inconsistent with the actual model.  1H9 indicates that the driving model of IPM inverter module (compressor A) does not match.
  • Page 72 Procedure For SCV-750EB and SCV-1400EB E0/H9 Main PCB or IPM inverter module PCB Ensure the dialing code is correct dialing code is not correct Replace Main PCB or IPM inverter module Notes: 1. Main PCB capability dialing code is designated S4 on the main PCBs (labeled 39 in Part 4, 2.2.1 Main PCB component);...
  • Page 73 5.3 E1 Troubleshooting Digital display output Description Phase sequence error.  Unit stops running.  Error code is displayed on main PCB and user interface.  Possible causes Power supply phases not connected in correct sequence.  Power supply terminals loose. ...
  • Page 74 Procedure The phase sequence of the 3-phase power Exchange any two of the 3 phase wires 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 refrigerant system main PCB Notes: 1.
  • Page 75 Error code is displayed on main PCB and user interface. Possible causes Communication wires between outdoor unit and user interface not connected properly.  For SCV-900EB, Communication wiring P Q E terminals misconnected. For SCV-750EB, SCV-1400EB SCV-1800EB,  Communication wiring X Y E terminals misconnected Wiring connection is loosen ...
  • Page 76 Procedure For SCV-900EB: Communication wires P Q E have short circuited, disconnected or are Reconnect the communication wires misconnected Communication wires P Q E are not Connect the communication wires in a connected in a daisy chain daisy chain Wires between outdoor main PCB and electric control box communication Ensure the wires are connected properly terminals block are loose...
  • Page 77 For SCV-750EB, SCV-1400EB and SCV-1800EB: Communication wires X Y E have short circuited, disconnected or are Reconnect the communication wires misconnected Communication wires X Y E are not Connect the communication wires in a connected in a daisy chain daisy chain...
  • Page 78 5.5 E3, E4, E5, E7, Eb, Ed, EE, EF, EP, EU, Fb, Fd Troubleshooting Digital display output...
  • Page 79 Description For SCV-750EB and SCV-1400EB E3 indicates total water outlet temperature sensor error (valid for the main unit)  E4 unit water outlet temperature sensor error  1E5 indicates condenser tube temperature sensor T3A error  2E5 indicates condenser tube temperature sensor T3B error ...
  • Page 80 Sensor not connected properly or has malfunctioned. Damaged main PCB.  Procedure For SCV-750EB and SCV-1400EB E3 / E4 / E5 / E6 /E7 / Eb / Ed /EE/ EF / EP / EU / Fb / Fd Sensor connection on main PCB or slave...
  • Page 81 For SCV-900EB and SCV-1800EB E3 / E4 / E5 / E7 / Eb / Ed /EE/ EF / EP / EU / Fb / Fd Sensor connection on main PCB is loose Ensure the sensor is connected properly Sensor has short-circuited or failed Replace the sensor Replace main PCB Notes:...
  • Page 82 5.6 E8 Troubleshooting Digital display output Description Power supply phase sequence protector output error  When this error occurs in the main unit, all units stop running. When this error occurs in the slave unit, the slave unit stops  running.
  • Page 83 For SCV-750EB and SCV-1400EB, wire connected to port CN28 on the main PCB. For SCV-900EB and SCV-1800EB, wire connected to port CN91 on the main PCB. (labeled 34 in Part 4, 2.2.1 Main PCB component)
  • Page 84 Notes: For SCV-750EB and SCV-1400EB, Water flow switch connection is port CN114 on the slave PCB (labeled 12 in Part 4, 2.7 Slave PCB component). For SCV-900EB and SCV-1800EB, Water flow switch connection is port CN8 on the main PCB (labeled 38 in Part 4, 2.2.1 Main PCB component).
  • Page 85 Notes: For SCV-750EB and SCV-1400EB, check digital display on the main PCB. If digital display is on, the main PCB is powered on, if digital display is off, the main PCB is powered off. Please refer to labeled 11 in Part 4, 2.7 Slave PCB component.
  • Page 86 5.9 EH Troubleshooting (for SCV-900EB and SCV-1800EB only) Digital display output Description EH indicates system self-check in the factory, it will not display in the normal operating. ...
  • Page 87 5.10 P0 Troubleshooting Digital display output Description Discharge pipe high pressure or discharge temperature switch protection. When the discharge pressure rises above 4.2MPa  or discharge temperature rises above 115°C, the system displays P0 protection and all units stop running. When the discharge pressure falls below 3.2MPa or discharge temperature fall below 90°C, P0 is removed and normal operation resumes.
  • Page 88 Procedure For SCV-750EB and SCV-1400EB High pressure switch or discharge Ensure High pressure switch or discharge temperature switch connection on main temperature switch are connected properly PCB is loose High pressure switch or discharge Replace the high pressure switch or...
  • Page 89 For SCV-900EB and SCV-1800EB High pressure switch or discharge Ensure High pressure switch or discharge temperature switch connection on main temperature switch are connected properly PCB is loose High pressure switch or discharge Replace the high pressure switch or temperature switch have short-circuited or discharge temperature switch failed The high pressure side is blocked, caused...
  • Page 90 5.11 P1 Troubleshooting Digital display output Description For SCV-750EB and SCV-1400EB P1 indicates suction pipe low pressure protection. When the suction pressure falls below 0.05MPa, the system displays P1  protection and all units stop running. When the pressure rises above 0.15MPa, P1 is removed and normal operation resumes.
  • Page 91 Procedure Insufficient refrigerant caused by Add refrigerant or inspect the system for refrigerant leakage leaks The low pressure side is blocked, caused by Inspect the system and fix the error. If the crushed or bent pipe, blocked EXV, or dirty filter is blocked by ice, the piping should be filter cleaned...
  • Page 92 5.12 P4, P5 Troubleshooting Digital display output Description 1 P4 indicates system A current protection  2 P4 indicates system A DC bus current protection  1 P5 indicates system B current protection  2 P5 indicates system B DC bus current protection ...
  • Page 93 Procedure P4/P5 The power supply is abnormal Check the power supply equipment Discharge part of the refrigerant. Add oil if Excess refrigerant it leaks during discharge refrigerant process 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 94 5.13 P6 Troubleshooting (for SCV-900EB and SCV-1800EB) Digital display output Description Indicates inverter module failure  When a P6 error occurs, a manual system restart is required before the system can resume operation. The cause of a  P6 error should be addressed promptly in order to avoid system damage. All units stop running.
  • Page 95 LED indicators LED1 and LED2 on inverter module Errors indicated on LED1 LED1 flashing pattern Corresponding error Flashes 8 times and stops for 1 second, then repeats xL0 - Inverter module protection Flashes 9 times and stops for 1 second, then repeats xL1 - DC bus low voltage protection Flashes 10 times and stops for 1 second, then repeats xL2 - DC bus high voltage protection...
  • Page 96 L0: Inverter module protection L0 protection Ensure the wire is The DC bus wire connected incorrectly connected properly The compressor wiring is connected Reconnect the cables incorrectly based on wiring diagram The resistance between 3 phases of Disconnect compressor is over 5Ω the power supply Replace the compressor...
  • Page 97 L1: Low-voltage protection The power supply is abnormal Check the power supply equipment DC bus voltage(P, N) is abnormal Change compressor module board Check the wire connection between power Power supply for compressor module supply terminals and filter board; Check the wire connection between filter board to board is abnormal compressor module board...
  • Page 98 L2: High-voltage protection The power supply is abnormal Check the power supply equipment DC bus voltage(P, N) is abnormal Change compressor module board Check the wire connection between power Power supply for compressor module supply terminals and filter board; Check the wire connection between filter board to board is abnormal compressor module board...
  • Page 99 L4: MCE error L4 protection Remove barriers from heat ODU ventilation is not good exchanger and air outlet of ODU ODU stop valves are closed Open the ODU stop valves Reconnect the cables based on Compressor wiring is not properly Disconnect wiring diagram the power...
  • Page 100 L7: Phase sequence error L7 protection Reconnect cables based on Compressor wiring is loose wiring diagram Disconnect the An open circuit in the 3-phase U/V/W power supply Replace the compressor of compressor terminals Replace the inverter module...
  • Page 101 L8: Compressor frequency variation greater than 15Hz within one second protection L9: Actual compressor frequency differs from target frequency by more than 15Hz protection L8 protection L9 protection ODU stop valves are closed Open the ODU stop valves Reconnect the cables based on Compressor wiring is not properly wiring diagram The resistance between 3 phases of...
  • Page 102 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. Drain the oil out of the compressor and retain it for inspection.
  • Page 103 Inspecting compressor oil This oil is This oil is a little black - it has yellow, but is clear been and transparent carbonized and the condition is acceptable This oil is still transparent but there are impurities which Cloudy or may clog the filter gray oil indicates...
  • Page 104 5.15 P7 Troubleshooting Digital display output Description For SCV-750EB and SCV-1400EB High temperature protection of air side heat exchanger tube temperature sensor “T3a / T3b” in cooling mode. When the  tube temperature of air side heat exchanger is higher than 62°C, the system displays P7 protection and all units stop running.
  • Page 105 Procedure For SCV-750EB and SCV-1400EB Air side heat exchanger tube temperature Ensure the temperature sensor is sensor “T3a / T3b” is loose connected properly Ensure fan motor wiring is connected Fan motor wiring connection is wrong properly Air side heat exchanger tube temperature sensor “T3a / T3b”...
  • Page 106 For SCV-900EB and SCV-1800EB Air side heat exchanger refrigerant outlet temperature sensor or air side heat Ensure the temperature sensor is exchanger refrigerant total outlet connected properly temperature sensor is loose Ensure fan motor wiring is connected Fan motor wiring connection is wrong properly Air side heat exchanger refrigerant outlet temperature sensor or air side heat...
  • Page 107 5.16 P9 Troubleshooting Digital display output Description Water inlet and outlet temperature difference protection  All units stop running.  Error code is displayed on main PCB and user interface.  Possible causes Temperature sensor not connected properly or has malfunctioned. ...
  • Page 108 Procedure Water side heat exchanger water inlet / Ensure the temperature sensor is outlet temperature sensor is loose connected properly Water side heat exchanger water inlet / outlet temperature sensor has Replace the temperature sensor short-circuited or failed Water piping contains air Purge air from the water system The water flow rate is not sufficient, caused by crushed or bent water piping, pump...
  • Page 109 Notes: For SCV-750EB and SCV-1400EB, combined Water side heat exchanger water outlet temperature sensor(Two), water side heat exchanger water inlet temperature sensor (Twi) and water side heat exchanger anti-freezing temperature sensor(Taf2) connections are ports CN4 and CN45 on the main PCB(labeled 29,21 in Part 4, 2.2.1 Main PCB component).Water outlet temperature sensor (Tw) connections is ports CN101 on the slave PCB (labeled 14 in...
  • Page 110 5.18 PC Troubleshooting Digital display output Description Water side heat exchanger low pressure protection.  All units stop running.  Error code is displayed on main PCB and user interface.  Possible causes  Low pressure switch not connected properly or has malfunctioned. ...
  • Page 111 Notes: For SCV-750EB and SCV-1400EB, low pressure sensor connection is port CN42 on the main PCB (labeled 27 in Part 4, 2.2.1 Main PCB component). For SCV-900EB and SCV-1800EB, low pressure sensor connection is port CN16 on the main PCB (labeled 30 in Part 4, 2.2.1 Main PCB component);...
  • Page 112 Actual ambient temperature is higher than 43℃.  Main PCB damaged.  Procedure For SCV-750EB and SCV-1400EB Outdoor ambient temperature sensor T4 Ensure the sensor is connected properly connection on main PCB is loose Outdoor ambient temperature sensor T4 has...
  • Page 113 For SCV-900EB and SCV-1800EB Outdoor ambient temperature sensor T4 Ensure the sensor is connected properly connection on main PCB is loose Outdoor ambient temperature sensor T4 Replace the sensor has short-circuited or failed Replace main PCB Notes: T4 temperature sensor connection is port CN1 on the main PCB (labeled 29 in Part 4, 2.2.1 Main PCB component). Measure sensor resistance.
  • Page 114 5.20 PE Troubleshooting Digital display output Description Water side heat exchanger low temperature antifreeze protection.  All units stop running.  Error code is displayed on main PCB and user interface.  Possible causes Temperature sensor not connected properly or has malfunctioned. ...
  • Page 115 Notes: For SCV-750EB and SCV-1400EB, Water side heat exchanger anti-freezing temperature sensor (Taf2) connection are ports CN45 on the main PCB (labeled 21 in Part 4, 2.2.1 Main PCB component). For SCV-900EB and SCV-1800EB, Water side heat exchanger anti-freezing temperature sensor (Taf, include Taf1 and Taf2) connection are ports CN31 and CN69 on the main PCB (labeled 31,32 in Part 4, 2.2.1 Main PCB component);...
  • Page 116 5.21 PL/C7 Troubleshooting Digital display output Description  PL indicates inverter module temperature protection. When the main inverter module temperature rises above 100 C, the system displays PL protection and all the units stop running. When the inverter module temperature drops below 70°C, the compressor enters re-start control When a PL error occurs 3 times in 100 minutes, C7 will display, a manual system restart is required before the system can ...
  • Page 117 Procedure PL/C7 The inverter compressor module heat sink Clean or replace the heat sink is blocked or dirty The screws connecting the heat sink to the Tighten the screws and make sure the heat inverter module are loose sink is well-connected Fan motor wiring connection is wrong Check the fan motor wiring connection Replace outdoor main PCB...
  • Page 118 5.22 PU/FF Troubleshooting Digital display output Description 1PU/FF indicates fan A module protection.  2PU/FF indicates fan B module protection.  FF indicates PU protection has displayed 10 times. When a FF occurred, a manual system restart is required before the ...
  • Page 119 Procedure PU/FF Some power wires or communication wires Ensure power and communication wires are of fan module are not connected properly connected properly The fan motor is blocked or has failed Remove obstruction or replace the fan motor The power supply is abnormal Check the power supply equipment Voltage between P and N on fan module is Replace AC filter board...
  • Page 120 Main PCB damaged.   the inverter module. Compressor inverter module damaged.  Procedure, For SCV-750EB and SCV-1400EB F0 error Reset the compressor inverter Compressor inverter module address setting module address via dial switch is incorrect S7 on inverter module...
  • Page 121 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. Switch Description S7-1 S7-2 Compressor A inverter module address setting Compressor B inverter module address setting Communication wire from outdoor main PCB CN26 to inverter module CN8/CN9.
  • Page 122 For SCV-900EB and SCV-1800EB F0 error Reset the compressor inverter Compressor inverter module address setting module address via dial switch is incorrect S7 on inverter module Communication wire from outdoor main Reconnect the communication PCB CN65 to inverter module CN8/CN9 is wire loosened Both LED1 and LED2 on inverter module are...
  • Page 123 Check the wired connection between CN36 of filter board and CN2/CN3 of compressor module board, the normal voltage should be 230AC. Check the wired connection between CN30 of filter board and CN58 of main control board, the normal voltage should be DC12V.
  • Page 124 High voltage circuit error.  Main PCB damaged.  Procedure For SCV-750EB and SCV-1400EB The grid power input voltage is too high Provide normal power supply (>456V) or too low (<342V) Communication fault between the Check the communication cable between...
  • Page 125 For SCV-900EB and SCV-1800EB ODU power supply voltage at or above 265V or drops below 170V or a phase is Provide normal power supply missing Wires between outdoor main PCB, AC filter boards and electric control box power Ensure the wires are connected properly supply terminals are loose High voltage circuit error has occurred, such as the compressor has...
  • Page 126 5.25 F6 Troubleshooting Digital display output Description  1F6 indicates A system buss voltage error (PTC). 2F6 indicates B system buss voltage error (PTC).  Only occurred in standby status.  Error code is displayed on main PCB and user interface. ...
  • Page 127 5.26 HE Troubleshooting Digital display output Description Electronic expansion valve connection error.  All units stop running.  Error code is only displayed on the unit with the error.  Possible causes Electronic expansion valve coil not connected properly or has malfunctioned. ...
  • Page 128 Notes: For SCV-750EB and SCV-1400EB, electronic expansion valve coil connections are port CN70, CN71 and CN72 on the main PCB (labeled 31, 32, 30 in Part 4, 2.2.1 Main PCB component). For SCV-900EB and SCV-1800EB, electronic expansion valve coil connections are port CN70, CN71 and CN72 on the main PCB (labeled 22, 20, 21 in Part 4, 2.2.1 Main PCB component).
  • Page 129 Discharge pipe temperature sensor connected properly or has malfunctioned.  For SCV-750EB and SCV-1400EB, discharge pipe temperature sensor at the top of the compressor falls or is not insulated.  For SCV-900EB and SCV-1800EB, electronic expansion valve coil not connected properly or has malfunctioned.
  • Page 130 Procedure For SCV-750EB and SCV-1400EB Discharge temperature sensor connection Ensure the sensor is connected properly on main PCB is loose Temperature or pressure sensor has Replace the sensor short-circuited or failed Discharge pipe temperature sensor at the Ensure that the sensor is installed in an...
  • Page 131 For SCV-900EB and SCV-1800EB Discharge temperature sensor connection Ensure the sensor is connected properly on main PCB is loose Temperature or pressure sensor has Replace the sensor short-circuited or failed Electronic expansion valve coil connection Ensure the sensor is connected properly on main PCB is loose Electronic expansion valve coil has Replace the EXV...
  • Page 132 5.28 F4 Troubleshooting Digital display output Description  1F4 module A L0 or L1 protection occurs for 3 times in 60 minutes.  2F4 module B L0 or L1 protection occurs for 3 times in 60 minutes. When F4 displays, a manual system restart is required before the system can resume operation. ...
  • Page 133 Error code is only displayed on main PCB and user interface. Possible causes For SCV-750EB and SCV-1400EB, The S3_1 of slave units is different with the master unit.  For SCV-900EB and SCV-1800EB, the S12_2 of slave units is different with the master unit.
  • Page 134 Notes: Dial switch S12_2 on the main PCB Default factory Switch Description setting Multiple pumps Single pump S12-2 Water pump control control...
  • Page 135 5.30 bH troubleshooting Digital display output Description bH indicates adhesion of compressor relay or PED board damaged.  All units stop running.  Error code is only displayed on main PCB and user interface.  Possible causes Power on within 5min after power off ...
  • Page 136 Note: 1． For SCV-750EB and SCV-1400EB, pressure sensor connection is port CN40 on the main PCB (labeled 20 in Part 4, 2.2.1 Main PCB component). Measure the resistance among the three terminals of the pressure sensor. If the resistance is of the order of mega Ohms or infinite, the pressure sensor has failed.
  • Page 137 5.32 P2 troubleshooting (for SCV-900EB and SCV-1800EB only) Digital display output Description P2 indicates total cold outlet temperature too high.  All units stop running.  Error code is only displayed on main PCB and user interface.  Possible causes Temperature sensor damaged ...
  • Page 138 Note: For SCV-750EB and SCV-1400EB, ambient temperature sensor connection port is CN30 on the main PCB (labeled 23 in Part 4, 2.2.1 Main PCB component). Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor’s resistance characteristics table, the sensor has failed.
  • Page 139 Note: For SCV-750EB and SCV-1400EB, inlet and outlet water temperature sensor connection port is CN4 on the main PCB (labeled 29 in Part 4, 2.2.1 Main PCB component). Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor’s resistance characteristics table, the sensor has failed.
  • Page 140 Note: 1． For SCV-750EB and SCV-1400EB, electronic expansion valve coil connections are port CN70, CN71 and CN72 on the main PCB (labeled31, 32, 30 in Part 4, 2.2.1 Main PCB component). The normal resistances between EXV coil wiring terminals is 40-50Ω. If any of the resistances differ from the value, the EXV coil has malfunctioned.

  • Page 141: Drive Module Failure

    6 Drive Module Failure (For SCV-750EB and SCV-1400EB only) 6.1 Error code table Error code Content Error category Need to power on again Overcurrent protection Overcurrent fault Transient phase current overcurrent protection Phase current overcurrent lasts 30s protection Module over temperature protection...
  • Page 142 6.2 L10: Hardware overcurrent Description The current exceeds the OCP protection value (peak value) set by the hardware or receives the FO signal from the IPM  module. After the fault, the compressor stops running. If the fault disappears after one minute, the compressor starts again. ...
  • Page 143 6.3 L11: Software overcurrent Description The current exceeds the OCP protection value (peak value) set by the software;  After the fault, the compressor stops running. If the fault disappears after one minute, the compressor starts again.  Trigger/resume condition Trigger condition: It is detected that the compressor current exceeds the OCP protection value set by the software for three ...
  • Page 144 6.4 L20: Module overheat protection Description IPM module temperature exceeds 105 °C.  After the fault, the compressor stops running, and if the fault disappears after one minute, the compressor starts again.  Trigger/resume condition Trigger condition: IPM module temperature exceeds 105 °C; ...
  • Page 145 6.5 L30: Low bus voltage protection Description The bus voltage is lower than the low bus voltage protection threshold (350VDC) set by the software.  After the fault, the compressor stops running, and if the fault disappears after one minute, the compressor starts again. ...
  • Page 146 6.6 L31: High bus voltage error Description The bus voltage is higher than the high bus voltage protection threshold (750VDC) set by the software.  After the fault, the compressor stops running, and if the fault disappears after one minute, the compressor starts again. ...
  • Page 147 6.7 L32: Excessively high bus voltage error Description The bus voltage is higher than the excessively high bus voltage protection threshold (770VDC) set by the software.  After the fault, the compressor stops running, and if the fault disappears after one minute, the compressor starts again. ...
  • Page 148 Procedure Check whether the three-phase input power supply of the driver board is out of Rectify the power supply phase or wrong while Standby Check whether the rear end of the L1L2 L1L2 main relay of driver Change the drive board relay input is out of phase while standby board is not operating After power off and complete discharge,...
  • Page 149 Possible causes The main controller's capacity dial or model dial is set incorrectly;  The matching model of the module board is incorrectly selected;  The main board circuit or the module board circuit is abnormal.  Procedure Spot check whether the unit model matches the dial reset model dial code of the model on the main control board Whether the model of the module board matches...
  • Page 150 Wrong module board which does not correspond to the model;  Module board fault.  Procedure Spot check whether the dial code of the main control Reset the dial code of the unit board is corresponding to the unit model model Whether the module board model match the Change the drive board...
  • Page 151 Procedure If possible, switch the compressors and start up again. If the problem persists, replace the two compressors. 6.15 L60: Fan motor phase loss protection Description Compressor has phase loss protection.  After the fault, the compressor stops running, and if the fault disappears after one minute, the compressor starts again. ...
  • Page 152 Trigger/resume condition Trigger condition: Open circuit of U-phase lower tube corresponding to compressor.  Resume condition: Check whether the IPM module is working.  Reset method: Change the module board. Power on and start up again.  Possible causes There IPM module is damaged. ...
  • Page 153 Procedure Check whether the IPM virtual welding and the PWM related transmission circuit of the MCU are connected to the welding.  If so, change the replace the drive board. 6.22 L6F: Open circuit of W-phase lower tube Description Open circuit of W-phase lower tube. ...

  • Page 154: Appendix

    7 Appendix 7.1 Temperature Sensor Resistance Characteristics Outdoor ambient temperature sensor, suction temperature sensor, coil final outlet temperature sensor, air side heat exchanger pipe temperature sensor and refrigerant temperature sensor of EVI plate heat exchanger resistance characteristics. Temperature Resistance Temperature Resistance Temperature Resistance...
  • Page 155 Compressor 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 12.21 3.392 430.5 57.37 11.79 3.296...
  • Page 156 Water side antifreeze temperature sensor, leaving water temperature sensor, entering water temperature and total leaving water temperature sensor resistance characteristics Temperature Temperature Temperature Temperature Resistance Resistance Resistance Resistance (kΩ) (kΩ) (kΩ) (kΩ) (°C) (°C) (°C) (°C) 470.8 61.2 12.2 444.5 58.5 11.7 419.9...
  • Page 157 If the outdoor ambient temperature is low, the system is being run in heating mode with the following settings:  temperature 55°C. The system has been running normally for more than 30 minutes.  For SCV-750EB and SCV-1400EB Outdoor unit in normal cooling mode operating parameters Outdoor ambient temperature °C < 10...
  • Page 158 For SCV-900EB and SCV-1800EB Outdoor unit in normal cooling mode operating parameters Outdoor ambient temperature °C < 10 10 to 25 25 to 35 35 to 48 Average discharge temperature °C 60-90 65-95 70-99 75-105 Average discharge superheat °C 15-30 28-40 29-42 30-46...

This manual is also suitable for:

Scv-900ebScv-1400ebScv-1800eb

Table of Contents