Sinclair SCV-1400EB Page 48 Service Manual Download | Manualshive

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2

PCB Introduction

2.1

Types

Aqua thermal 75kW, 90kW and 140kW unit have one main control board, two compressor inverter module board, two DC fan
inverter module board and one filter board.
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

Voltage

1

CN32

POWER

Power supply port

220-240V

2

CN99

Expanding board power connector

220-240V

3

CN68

PUMP

Pump contactor control port (connected in factory)

220-240V

4

CN74/CN67

CCH

compressor heating belt

220-240V

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Summary of Contents for SCV-1400EB

Page 1: ...AIR CONDITIONING AIR COOLED MODULAR CHILLER UNIT SCV 900EB SCV 1400EB SCV 1800EB SCV 750EB SERVICE MANUAL...

Page 2: ......

Page 3: ...1 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 4: ...2...

Page 5: ...3 Part 1 General Information 1 Unit Capacities and External Appearance 4 2 Water outlet temperature range 4...

Page 6: ...emperature mode can be set through wired controller please refer to the Operation Manual for details If low leaving water temperature function is effective the operation range will extend to the red f...

Page 7: ...0EB SCV 1800EB Outlet water temperature 25 20 15 10 5 0 5 10 15 20 25 30 35 40 45 50 20 25 30 35 40 45 50 55 60 outdoor temperature HEATING 25 20 15 10 5 0 5 10 15 20 25 30 35 40 45 50 20 25 30 35 40...

Page 8: ...6...

Page 9: ...7 Part 2 Component Layout and Refrigerant Circuits 1 Layout of Functional Components 8 2 Piping Diagrams 12 3 Refrigerant Flow Diagrams 21...

Page 10: ...e heating exchanger 11 Four way valve 2 Brushless DC Motor 7 Flow switch 12 Plate heating exchanger 3 Condenser 8 Safety valve Refrigerant side 13 Oil separator 4 Exhaust valve 9 Gas liquid separator...

Page 11: ...ty valve 5 6 High pressure switch 17 Electionic expansion valve 28 Gas liquid separator 7 8 Filter 18 Heat sink assembly 29 Meter connector 9 Meter connector 19 Single pass solenoid valve suit 30 Low...

Page 12: ...Condenser 9 Electronic expansion valve 2 DC inverter compressor 2 6 Electronic expansion valve 10 Gas liquid separator 3 Oil seperator 7 Brazing plates heating exchanger 11 Plate heat exchanger 4 4 wa...

Page 13: ...28 Gas liquid separator 5 High pressure switch 17 Electionic expansion valve 29 Meter connector 6 High pressure switch 18 Heat sink assembly 30 Low pressure switch 7 Filter 19 Single pass solenoid va...

Page 14: ...temperature sensor 12 DC fan 2 36 temperature sensor 13 Filter 37 temperature sensor 14 One way valve 38 Antifreeze temperature sensor 1 15 Heating Electronic expansion valve 39 Antifreeze temperature...

Page 15: ...cooled refrigerant can achieve better heat exchange in indoor side In heating mode the refrigerant comes from the plate heat exchanger going to the compressor can enhance the refrigerant enthalpy and...

Page 16: ...ressors are stopped 22 Water side heat exchanger electric heater Protects the water side heat exchanger from ice formation 23 Water flow switch electric heater Protects the water from ice formation 24...

Page 17: ...Enhanced vapor injection solenoid valve 1 15 DC fan 1 44 Enhanced vapor injection solenoid valve 2 16 DC fan 2 45 Muffler 1 17 Filter 46 Muffler 2 18 One way valve 47 Ambient temperature sensor 19 He...

Page 18: ...purge valve Automatically removes air from the water circuit 10 Safety valve Prevents excessive water pressure by opening at 6bar and discharging water from the water circuit 11 Water flow switch Dete...

Page 19: ...17 21 Solenoid valve SV6 by pass Increase refrigerant flow 22 Solenoid valve SV8A SV8B injection Enhance enthalpy and capacity...

Page 20: ...ffler 2 19 Filter 49 Ambient temperature sensor 20 One way valve 50 temperature sensor 21 Electronic expansion valve 51 temperature sensor 22 temperature sensor 52 Antifreeze temperature sensor 1 23 P...

Page 21: ...improve the heating capacity in low ambient temperature Refrigerant volume in plate heat exchanger is controlled according to temperature different between plate heat exchanger inlet and outlet 9 Elec...

Page 22: ...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...

Page 23: ...ant Flow Diagrams SCV 750EB Heating operation Cooling and defrosting operation inlet outlet E D S C inlet outlet E D S C High temperature high press gas High temperature high press liquid Low temperat...

Page 24: ...22 SCV 900EB Heating operation Cooling and defrosting operation High temperature high press gas High temperature high press liquid Low temperature low press...

Page 25: ...n SCV 1800EB The refrigerant flow diagrams is same as SCV 900EB SCV 1800EB system consists of two independent SCV 900EB systems inlet outlet E D S C inlet outlet E D S C High temperature high press ga...

Page 26: ...24...

Page 27: ...25 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: ...rol Component control during normal operation Compressor output control Compressor step control Water pump select control Four way valve control Electronic expansion valve control Outdoor fan control...

Page 29: ...ase Heater Control The crankcase heater is used to prevent refrigerant from mixing with compressor oil when the compressors are stopped The crankcase heater is controlled according to the outdoor ambi...

Page 30: ...d is turned on for 2min if water flow switch is open water pump stops and water flow error code appears The compressor can be started after the water flow is normal Electric auxiliary heater pipe Cont...

Page 31: ...g Operation For SCV 900EB Component Wiring diagram label 90kW Control functions and states DC fan motor A Fan A According to ambient temperature compressor frequency and air side heat exchanger refrig...

Page 32: ...difference between economizer plate heat exchanger inlet and outlet Four way valve ST1 Open Solenoid valve defrost SV5 Closed Solenoid valve by pass SV6 Open for 600s then closed Solenoid valve inject...

Page 33: ...or code appears The compressor can be started after the water flow is normal Electric auxiliary heater pipe Controlled according to ambient temperature and total water outlet temperature Crank case he...

Page 34: ...o 480 Controlled according to temperature difference between economizer plate heat exchanger inlet and outlet Four way valve ST1 Closed Solenoid valve oil balance SV4 Open for 3min after every 17min S...

Page 35: ...pipe temperature Electronic expansion valve EXV Position steps from 0 fully closed to 480 fully open controlled according to outdoor ambient temperature discharge temperature suction superheat compre...

Page 36: ...is first turned on the EXV is closed for 700 steps proofreading the 0 step position and re opening at a maximum of 480 Startup Adjust from 480 to the initial position the initial opening is determined...

Page 37: ...FAN A FAN B 0 0 0 1 150 0 2 190 0 3 230 0 4 270 0 5 330 0 6 150 150 7 170 150 8 170 150 9 190 170 10 210 190 11 230 210 12 250 230 13 270 250 14 290 270 15 310 290 16 330 310 17 350 330 18 370 350 19...

Page 38: ...330 0 6 150 150 7 170 170 8 170 170 9 190 190 10 210 210 11 230 230 12 250 250 13 270 270 14 290 290 15 310 310 16 330 330 17 350 350 18 370 370 19 400 400 20 430 430 21 470 470 22 510 510 23 550 550...

Page 39: ...ratures and transient spikes in temperature When the discharge temperature rises above 115 C the system displays P0 protection and all the units stop running When the discharge temperature drops below...

Page 40: ...module temperature is calculated by inverter module When the module temperature rises above 100 C the system displays PL protection and all the units stop running When the module temperature drops bel...

Page 41: ...rotection Control When water side heat exchanger anti freeze protection occurs the system displays error code Pb and all the units stop running 6 8 Air Side Heat Exchanger High Temperature Protection...

Page 42: ...r 30s or Pe 0 5Mpa for 5s the system displays PC protection and all the units stop running When the unit stop the compressor enters re start control Low leaving water temperature mode In low water tem...

Page 43: ...with the unit with the highest address 1 2 8 9 16 Startup Startup Startup Startup Running Running Running Loading Offloading Loading in sequence from 9 to 16 Offloading in sequence from 16 to 1 1 2 8...

Page 44: ...unction of TEMP SWITCH must be set by wired controller for two target water temperature For cooling and heating mode different water temperatures can be switched just by one touch The operation method...

Page 45: ...43 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: ...44 1 Electric Control Box Layout For SCV 750EB For SCV 1400EB...

Page 47: ...ontrol board AC filter board 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 Re...

Page 48: ...wo 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 Explanat...

Page 49: ...the condenser DC3 3V 23 CN30 T4 Outdoor ambient temperature sensor DC3 3V 24 CN16 T3B Pipe temperature sensor of the condenser DC3 3V 25 CN38 TP2 DC inverter compressor B discharge temperature sensor...

Page 50: ...tion solenoid valve of compressor system A 230VAC 5 CN5 Water side heat exchanger heater 230VAC 6 CN40 Multi function solenoid valve 230VAC 7 CN13 Electric of water side heat exchanger heater 230VAC 8...

Page 51: ...nected in parallel DC5V 32 CN69 Temperature sensors input port Tp1 DC inverter compressor 1 discharge temperature sensor Tp2 DC inverter compressor 2 discharge temperature sensor Tz Coil final outlet...

Page 52: ...units parallel connection 0 Note 1 Wiring of HEAT COOL weak electric port The remote function of HEAT COOL must be set by DIP switch The remote function HEAT COOL is effective when S1 1or S5 3 is chos...

Page 53: ...h can be turned on off at any time If the switch is closed unit turns on If the switch is open unit turns off 2 Remote cool heat Connect a switch between 14 and 23 terminals of block XT2 Refer to the...

Page 54: ...pressure switch 10 S7 module address setting system A 00 system B 01 11 CN27 1 PED board connection port DC12V DC5V 12 CN27 2 PED board connection port DC12V DC5V 13 CN25 DEBUG Driver burn port WizPr...

Page 55: ...ply in L3 400VAC 6 CN12 Compressor connection port U VUV VUW VVW 0 380V AC 7 CN13 Compressor connection port V 8 CN14 Compressor connection port W 9 CN20 Power supply for fan module DC20V 10 S7 Addres...

Page 56: ...fan module board DC565V 18 IC25 EEPROM DC5V Compressor Inverter Module PCB field setting Switch Description S7 1 S7 2 S7 Compressor A inverter module address setting OFF OFF Compressor B inverter mod...

Page 57: ...age 1 CN6 Fan module control power supply output port DC19V 2 CN12 Reserve 3 SW1 Fan module address setting 4 CN1 CN4 Fan module communication port DC5V 5 CN9 DEBUG Program burn port WizPro200RS progr...

Page 58: ...ld setting Switch Description S1 1 S1 2 S1 Fan A inverter module address setting OFF OFF Fan B inverter module address setting OFF ON 2 5 AC Filter Board For SCV 750EB and SCV 1400EB Label Code Port E...

Page 59: ...V 6 CN36 Power supply for compressor inverter module 230VAC 7 CN13 Power supply port for main PCB Three phase sequence detection port 230VAC 8 CN34 Power supply for three phase water pump 400VAC 9 CN3...

Page 60: ...t installation 220 240V 5 CN121 COMP STATE Compressor Status Indication 6 CN119 HEAT1 Pipe auxiliary motor heating belt 7 CN108 PUMP V Frequency conversion pump 0 10V control signal DC 0 10V 8 CN110 W...

Page 61: ...59 3 Wiring diagram 3 1 Single unit For SCV 750EB and SCV 1400EB...

Page 62: ...60 For SCV 900EB...

Page 63: ...61 For SCV 1800EB...

Page 64: ...pipeline MAIN CONTROL WIRECONTROLLER X Y X Y X Y XT3 POWER 380 415V 3N 50Hz ENC1 AC1 AC2 MAIN CONTROL WIRECONTROLLER X Y E RD YE BK BR WH POWER 380 415V 3N 50Hz RVV 300 500 5X16mm 2 X Y E AC1 AC2 RD Y...

Page 65: ...eline 5 6 7 8 9 10 11 12 5 6 7 8 9 10 11 12 CN74 CN61 MAIN CONTROL WIRECONTROLLER CN60 5 6 7 8 9 10 11 12 5 6 7 8 9 10 11 12 CN74 CN61 WH RD YE BK BR X Y E AC1 AC2 RD YE BK BR WH MONITOR WIRECONTROLLE...

Page 66: ...MAIN CONTROL WIRECONTROLLER X Y X Y X Y XT3 POWER 380 415V 3N 50Hz POWER 380 415V 3N 50Hz ENC1 AC1 AC2 X Y E RD YE BK BR WH RVV 300 500 5X50mm 2 X Y E AC1 AC2 RD YE BK BR WH Main board Slave board CN2...

Page 67: ...65 For SCV 1800EB 7 MONITOR WIRECONTROLLER MONITOR WIRECONTROLLER 7 7 MAIN CONTROL WIRECONTROLLER MAIN CONTROL WIRECONTROLLER...

Page 68: ...error alarm for SCV 900EB and SCV 1800EB Displayed on main PCB and user interface EP Discharge sensor error alarm Displayed on main PCB and user interface EU Tz sensor error Displayed on main PCB and...

Page 69: ...CB and user interface Fd Suction temperature sensor error Displayed on main PCB and user interface FF 1FF DC fan A error Displayed on main PCB and user interface 2FF DC fan B error Displayed on main P...

Page 70: ...ce with all applicable legislation all national local and other laws standards codes rules regulations and other legislation that apply in a given situation Power off the outdoor units before connecti...

Page 71: ...e d user interface For SCV 900EB and SCV 1800EB E0 indicates main PCB EEPROM error 1H9 indicates IPM inverter module compressor A EEPROM error 2H9 indicates IPM inverter module compressor B EEPROM err...

Page 72: ...nverter module PCB For SCV 900EB and SCV 1800EB E0 H9 Main PCB or IPM inverter module EEPROM1 is not connected properly Yes Ensure the EEPROM is connected properly No EEPROM damaged Yes Replace the EE...

Page 73: ...t 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 terminal...

Page 74: ...e sequence is inverted the compressor will operate inversely If the wiring connection of each outdoor unit is in A B C phase sequence and multiple units are connected the current difference between C...

Page 75: ...uses 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 Communicatio...

Page 76: ...e close to a source of electromagnetic radiation such as transformer or strong fluorescent lamp Yes Remove the source of interference or add additional shielding to the communication wires No Damaged...

Page 77: ...ation such as transformer or strong fluorescent lamp Yes Remove the source of interference or add additional shielding to the communication wires No Damaged control box communication terminals block Y...

Page 78: ...76 5 5 E3 E4 E5 E7 Eb Ed EE EF EP EU Fb Fd Troubleshooting Digital display output...

Page 79: ...late heat exchanger refrigerant temperature sensor T6B error EF indicates unit water return temperature sensor error EP indicates discharge temperature sensor failure error EU indicates water side hea...

Page 80: ...n PCB or slave PCB is loose Yes Ensure the sensor is connected properly No Sensor has short circuited or failed2 Yes Replace the sensor No Replace main PCB or expansion PCB Notes 1 Most sensors are co...

Page 81: ...ce main PCB Notes 1 All the sensors are connected to port CN1 CN16 CN31 CN3 CN10 and CN69 on the main PCB labeled 29 30 31 32 in Part 4 2 2 1 Main PCB component 2 Measure sensor resistance If the resi...

Page 82: ...its stop running When this error occurs in the slave unit the slave unit stops running Error code is displayed on main PCB and user interface Possible causes Power supply phases not connected in corre...

Page 83: ...phase sequence requirements If the phase sequence is inverted the compressor will operate inversely If the wiring connection of each outdoor unit is in A B C phase sequence and multiple units are conn...

Page 84: ...flow switch connection on main PCB is loose1 Yes Ensure the switch is connected properly No Water flow is insufficient Yes Check the water piping and valves Make sure the water piping is clean there...

Page 85: ...me outdoor units in the system are powered off1 Yes Power on all the outdoor units No The power supply is abnormal Yes Check the power supply equipment No Troubleshoot as for an E2 error2 Notes 1 For...

Page 86: ...84 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: ...falls below 3 2MPa or discharge temperature fall below 90 C P0 is removed and normal operation resumes When P0 error occurs 3 times in 60 minutes a manual system restart is required before the system...

Page 88: ...PCB labeled 26 in Part 4 2 2 1 Main PCB component High pressure switch connection is port CN21 on the IPM inverter module PCB 2 Measure the resistance among the three terminals of the pressure sensor...

Page 89: ...ow rate is not sufficient in cooling mode Yes Inspect the water system and fix the error No Replace outdoor main PCB Notes 1 High pressure switch connection is port CN20 on the main PCB labeled 19 in...

Page 90: ...eleased and the unit can resume startup P1 the last one indicates during the operation of the compressor of the unit if the exhaust superheat is too high and lasts for 30min report P1 protection first...

Page 91: ...icient refrigerant An insufficiency of refrigerant causes compressor discharge temperature to be higher than normal discharge and suction pressures to be lower than normal and compressor current to be...

Page 92: ...lays P4 or P5 protection and all units stop running When the current returns to the normal range P4 or P5 is removed and normal operation resumes When P4 or P5 error occurs 3 times in 60 minutes a man...

Page 93: ...ioned4 Yes Replace the compressor No Replace outdoor main PCB Notes 1 In heating mode check water side heat exchanger water piping circulator pumps and water flow switch for dirt blockages In cooling...

Page 94: ...rter module protection If P6 error code is displayed please spot check the specific error code through the wired controller Specific error code1 Content xL0 Inverter module protection xL1 DC bus low v...

Page 95: ...shes 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 s...

Page 96: ...N13 V CN14 W respectively If the voltage value is 0V it means the IGBT or freewheel diode is damaged Similarly put the red pin on CN38 N and put the black pin on CN12 U CN13 V and CN14 W respectively...

Page 97: ...filter board Check the wire connection between filter board to compressor module board No Wire connection between reactor and compressor module board is abnormal Yes Rewiring according to the wiring...

Page 98: ...or compressor module board is abnormal Yes Check the wire connection between power supply terminals and filter board Check the wire connection between filter board to compressor module board No Change...

Page 99: ...d Open the ODU stop valves Reconnect the cables based on wiring diagram The resistance between 3 phases of compressor is over 5 Replace the compressor The insulation resistance of compressor is less t...

Page 100: ...rotection Compressor wiring is loose Reconnect cables based on wiring diagram An open circuit in the 3 phase U V W of compressor terminals Replace the compressor Replace the inverter module No No Yes...

Page 101: ...ance between 3 phases of compressor is over 5 Replace the compressor The insulation resistance of compressor is less than 100 Replace the compressor inverter board restart the unit and the error is so...

Page 102: ...the other compressors in the system Drain the oil from any compressors where the oil has been spoiled Go to Step 4 Step 4 Replace oil separator s and accumulator s If the oil from a compressor is spoi...

Page 103: ...rn scroll plate Normal compressor bearings Seriously worn and damaged bearings This oil is black it has been carbonized This oil is a little yellow but is clear and transparent and the condition is ac...

Page 104: ...exchanger refrigerant total outlet temperature sensor in cooling mode When the air side heat exchanger refrigerant outlet temperature is higher than 62 C the system displays P7 protection and all unit...

Page 105: ...spect the system and fix the error No The fan or fan motor is blocked or damaged Yes Inspect the system and fix the error No Replace outdoor main PCB Notes 1 Air side heat exchanger tube temperature s...

Page 106: ...changer heat exchange is poor3 Yes Inspect the system and fix the error No The fan or fan motor is blocked or damaged Yes Inspect the system and fix the error No Replace outdoor main PCB Notes 4 Air s...

Page 107: ...et 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 malfuncti...

Page 108: ...Notes 1 For SCV 900EB and SCV 1800EB water side heat exchanger water inlet temperature sensor and water side heat exchanger water outlet temperature sensor connections are port CN4 on the main PCB la...

Page 109: ...ger 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 C...

Page 110: ...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 Insufficient refrigerant Low pressure side...

Page 111: ...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 2 Measure the resistance among the three terminals of the pressure sensor If t...

Page 112: ...Ensure the sensor is connected properly No Outdoor ambient temperature sensor T4 has short circuited or failed2 Yes Replace the sensor No Ambient temperature sensor is interfered by other heat source...

Page 113: ...place the sensor No Replace main PCB Notes 3 T4 temperature sensor connection is port CN1 on the main PCB labeled 29 in Part 4 2 2 1 Main PCB component 4 Measure sensor resistance If the resistance is...

Page 114: ...tection All units stop running Error code is displayed on main PCB and user interface Possible causes Temperature sensor not connected properly or has malfunctioned Insufficient refrigerant Low pressu...

Page 115: ...ture 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 2 Measure sensor resistance If the resistance is too low the s...

Page 116: ...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 sys...

Page 117: ...sink No The screws connecting the heat sink to the inverter module are loose1 Yes Tighten the screws and make sure the heat sink is well connected No Fan motor wiring connection is wrong Yes Check th...

Page 118: ...hen a FF occurred a manual system restart is required before the system can resume operation All units stop running Error code is only displayed on the main PCB and user interface Possible causes Swit...

Page 119: ...ower supply is abnormal Yes Check the power supply equipment No Voltage between P and N on fan module is abnormal2 Yes Replace AC filter board No Replacing the fan module resolves the error No Replace...

Page 120: ...Resume automatically Possible causes Incorrect compressor inverter module address setting Loosened communication wiring from the main PCB to the inverter module Bridge rectifier damaged Main PCB dama...

Page 121: ...erter module address setting OFF OFF Compressor B inverter module address setting OFF ON 2 Communication wire from outdoor main PCB CN26 to inverter module CN8 CN9 Communication port CN28 on main PCB...

Page 122: ...dule CN8 CN9 Communication port CN65 on main PCB Communication port CN8 CN9 on inverter module 3 ED1 2 on inverter module F0 error Compressor inverter module address setting is incorrect Reset the com...

Page 123: ...ion 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 no...

Page 124: ...e has short circuited5 Yes Replace or repair the relevant parts No Replace compressor module board Notes 1 The detected voltage is detected by the compressor module board and sent to the main control...

Page 125: ...normal voltage between A and N B and N and C and N is 207 253V 2 Refer to Part 4 3 Wiring diagram and PCB components to make sure wire connection is firm 3 The normal resistances of the inverter compr...

Page 126: ...nly occurred in standby status Error code is displayed on main PCB and user interface Possible causes Abnormal power supply voltage Loosened wiring within electric control box High voltage circuit err...

Page 127: ...put 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...

Page 128: ...00EB 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...

Page 129: ...on main PCB and user interface Possible causes Discharge pipe temperature sensor connected properly or has malfunctioned For SCV 750EB and SCV 1400EB discharge pipe temperature sensor at the top of th...

Page 130: ...too high Yes The temperature difference between water inlet and water outlet or water inlet is too high No Yes Replace outdoor main PCB No Water flow is insufficient Yes Refer to E9 error Notes 1 Ele...

Page 131: ...on valve coil has malfunctioned2 Yes Replace the EXV No Discharge pressure is too high Yes The temperature difference between water inlet and water outlet or water inlet is too high No Yes Replace out...

Page 132: ...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 Possible...

Page 133: ...with the master unit For SCV 900EB and SCV 1800EB the S12_2 of slave units is different with the master unit Main PCB damaged Procedure For SCV 750EB and SCV 1400EB FP The S3_1 of slave units is diff...

Page 134: ...132 Notes 2 Dial switch S12_2 on the main PCB Switch Description ON OFF Default factory setting S12 S12 2 Water pump Multiple pumps control Single pump control OFF...

Page 135: ...compressor relay Compressor module board damaged Procedure bH Power on within 5min after power off Yes Power on after 5min after power off No Replace PED board to check whether error disappears Yes U...

Page 136: ...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 res...

Page 137: ...Total cold outlet temperature sensor1 damaged Yes Replace total cold outlet temperature sensor No Replace main control board Note 1 Total cold outlet temperature sensor connection port is CN31 on the...

Page 138: ...d Note 1 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 to...

Page 139: ...rature sensor No Replace main control board Note 1 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 com...

Page 140: ...e normal resistances between EXV coil wiring terminals is 40 50 If any of the resistances differ from the value the EXV coil has malfunctioned 2 For SCV 900EB and SCV 1800EB electronic expansion valve...

Page 141: ...istance detection YES L50 Startup failure Control fault NO L51 Out of step error Reserved NO L52 Zero speed protection NO L60 Fan motor phase loss protection Diagnostic fault NO L65 IPM short circuit...

Page 142: ...er OCP The compressor winding is short circuited between phases resulting in instantaneous high current to trigger OCP or FO The voltage of the system power supply drops or is interrupted for a short...

Page 143: ...on The compressor shuts down after a fault and resumes after reaching the fault exit condition one minute later Reset method Automatic recovery after reaching the fault exit condition one minute later...

Page 144: ...he heat dissipation silicone of the IPM module is not evenly spread resulting in poor heat dissipation The system lacks refrigerant or the refrigerant radiator pipeline is blocked resulting in poor he...

Page 145: ...recovery after reaching the fault exit condition one minute later Possible causes The input voltage is too low resulting in low bus voltage The voltage drop and interrupt resulting in the low instant...

Page 146: ...eshold set by the software one minute later Reset method Automatic recovery after reaching the fault exit condition one minute later Possible causes The input voltage is too high resulting in high bus...

Page 147: ...orresponding relationship between the three phase input power supply of the driver board and the PN voltage does not match Yes Change the drive board NO Three phase input power is too high Yes Rectify...

Page 148: ...tion The AD offset value of the current sampling circuit reaches half of the AD full scale Resume condition After this fault occurs the compressor cannot be started It is necessary to check whether th...

Page 149: ...ery after reaching the fault exit condition one minute later Possible causes Internal short circuit of the IPM module Short circuit of compressor winding System condensation results in short circuit o...

Page 150: ...fault is recovered after successful restart Reset method Automatic recovery after successful restart Possible causes There is a pressure difference when the system starts Compressor stuck Procedure L5...

Page 151: ...minute the compressor starts again Trigger resume condition Trigger condition Compressor has short circuit to ground protection Resume condition Check whether the compressor casing is damaged resultin...

Page 152: ...t of the MCU are connected to the welding If so change the replace the drive board 6 20 L6d Open circuit of V phase lower tube Description Open circuit of V phase lower tube After the fault the compre...

Page 153: ...d if the fault disappears after one minute the compressor starts again Trigger resume condition Trigger condition Open circuit of W phase lower tube corresponding to compressor Resume condition Check...

Page 154: ...6 8 56 37 32 7 295 72 1 537 112 0 4470 7 52 24 33 6 981 73 1 485 113 0 4348 6 49 32 34 6 684 74 1 435 114 0 4230 5 46 57 35 6 400 75 1 387 115 0 4116 4 44 00 36 6 131 76 1 341 116 0 4006 3 41 59 37 5...

Page 155: ...89 73 8 643 113 2 559 6 247 8 34 37 30 74 8 358 114 2 489 5 234 9 35 35 78 75 8 084 115 2 422 4 222 8 36 34 32 76 7 820 116 2 357 3 211 4 37 32 94 77 7 566 117 2 294 2 200 7 38 31 62 78 7 321 118 2 23...

Page 156: ...10 2 5 9 255 4 31 37 8 71 8 3 111 2 4 8 242 1 32 36 2 72 8 0 112 2 3 7 229 6 33 34 7 73 7 7 113 2 3 6 217 8 34 33 3 74 7 5 114 2 2 5 206 6 35 31 9 75 7 2 115 2 1 4 196 1 36 30 7 76 7 0 116 2 1 3 186 2...

Page 157: ...25 Two C 5 20 5 20 5 20 5 20 Tw C 5 20 5 20 5 20 5 20 DC fan motor current A 0 2 4 75KW 0 2 6 140KW 1 4 75KW 1 6 140KW 1 5 4 75KW 1 5 6 140KW 2 4 75KW 2 6 140KW DC inverter compressor current A 15 45...

Page 158: ...nverter compressor current A 15 45 15 48 20 56 20 56 Outdoor unit in heating mode operating parameters Outdoor ambient temperature C 10 10 to 0 0 to 7 7 to 20 20 Average discharge temperature C 50 104...

Page 159: ......

Page 160: ...0 1 234 56 0 7 8 234 0 9 1 7 1 0 6 16 3 5 9 4 260 88 4 260 88 08 88 688 0 4 08 4 6 4A8 60 B...

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