LG MULTIV III, Service Manual

Page 1: ...NUAL MODEL PRHR041 PRHR041A PRHR031 PRHR031A PRHR021 PRHR021A CAUTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel Internal Use Only http biz lgservice com R410A ...

Page 2: ...3 Part 1 General Information 5 Model Names 6 External Appearance 7 Nomenclature 8 Part 2 HR Units 9 Part 3 PCB Setting 19 Part 4 Trouble shooting guide 35 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 2 ...

Page 3: ...e not to do Be sure to follow the instruction WARNING Installation Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 When installing and moving the air conditioner to another site do not charge it with a different refrig erant from the refrigerant specified on the unit If a different refrigerant or air is mixed with the original ref...

Page 4: ... may not be applied to the terminals Inadequate connection and fastening may gen erate heat and cause a fire Avoid a place where rain may enter since the HR unit is for indoor There is risk of property damage failure of prod uct or electric shock Install the HR unit at a place in which it is not affected by operation mode changing noise Installation within cell such as meeting room etc may disturb...

Page 5: ... 5 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 1 General Information 1 Model Names 6 2 External Appearance 7 3 Nomenclature 8 ...

Page 6: ...eserved Only for training and service purposes LGE Internal Use Only Power Supply 2 branches 3 branches 4 branches 1Ø 220 240V 50Hz 1Ø 220V 60Hz PRHR021 PRHR031 PRHR041 1Ø 208 230V 60Hz PRHR021A PRHR031A PRHR041A 1 Model Names 1 1 HR Unit Model Names ...

Page 7: ...c All right reserved Only for training and service purposes LGE Internal Use Only External Appearance 2 External Appearance 2 1 HR Unit 2 branches 4 branches 1 2 3 1 2 4 3 branches 1 2 3 PRHR021 PRHR021A PRHR031 PRHR031A PRHR041 PRHR041A ...

Page 8: ...f Connected branches 02 For 2 branches 03 For 3 branches 04 For 4 branches Indicates that this is System HR Unit using the R410A PRHR 04 1 Serial Number No of Connected branches 02 For 2 branches 03 For 3 branches 04 For 4 branches Indicates that this is System HR Unit using the R410A PRHR 04 1 A Nomenclature 3 Nomenclature 3 1 HR Unit ...

Page 9: ... 9 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 2 HR Units ...

Page 10: ...Inc All right reserved Only for training and service purposes LGE Internal Use Only 1 Specifications 11 2 Parts Functions 12 3 Dimensions 13 4 Piping Diagrams 14 5 Wiring Diagrams 15 6 Electric Characteristics 16 7 Functions 17 HR Units ...

Page 11: ...anch Net Weight kg lbs Dimensions mm WxHxD Inch Casing Connecting Pipes Indoor Liquid Pipe mm inch Gas Pipe mm inch Outdoor Liquid mm inch Low Pressure mm inch High Pressure mm inch Sound Absorbing Insulation Material Power Supply PRHR021 PRHR021A PRHR031 PRHR031A PRHR041 PRHR041A 16 24 32 8 8 8 18 20 22 39 7 44 1 48 5 801x218x617 801x218x617 801x218x617 31 5x8 6x24 3 31 5x8 6x24 3 31 5x8 6x24 3 G...

Page 12: ...indoor unit GSP Gas pipe Liquid pipe connected with indoor unit LP2 Liquid pipe 2 Control the path for heating or cooling SOL1 2 Solenoid assembly 1 2 Liquid pipe connected with outdoor unit LP1 Liquid pipe 1 Pipe for high pressure gas HPGV High pressure gas pipe Pipe for low pressure gas LPGV Low pressure gas pipe Major function Symbol Parts name Balancing valve Low pressure gas pipe High pressur...

Page 13: ...Use Only 1 HR Units Dimensions 480 18 29 32 137 5 13 32 345 13 19 32 481 18 15 16 218 8 19 32 38 1 1 2 60 2 3 8 30 1 3 16 174 6 27 32 453 17 27 32 204 8 1 32 98 3 27 32 CHASSIS CODE Outdoor Unit PRHR041 PRHR041A PRHR031 PRHR031A PRHR021 PRHR021A 76 Seongsan dong Changwon City Gyeongnam 641 713 Korea Dimensions ...

Page 14: ...d pipe Gas pipe Liquid pipe Gas pipe s Solenoid EEV Sensor A B C D 1 HR Unit Piping Diagrams Ⓐ To be switched operation between cooling and heating by two Solenoid valve Ⓑ To be used decreasing noise according to sub cooling of inlet and outlet of indoor unit Simultaneous operation Ⓒ To prevent liquid charging between high pressure gas valve and HR unit at cooling mode Ⓓ To be controlled the press...

Page 15: ...for room1 CN09 Solenoid valve 02 Bypass for room2 CN10 Solenoid valve 03 Bypass for room3 CN11 Solenoid valve 04 Bypass for room4 CN12 Solenoid valve bypass CN14 Sub cooling EEV CN16 SC Out Sensor sub cooling out CN16 SC In Sensor sub cooling in CN18 Liquid Sensor liquid receiver SW01M Solonoid valve number Setting When manual address SW02M 1 Selecting auto address or manual address SW02M 2 3 Sett...

Page 16: ...erminals is not below or above the listed range limits 2 Maximum allowable voltage unbalance between phase is 2 3 MCA MFA MCA 1 25 x FLA MFA 4 x FLA Next lower standard fuse rating Minimum 15A 4 Select wire size based on the MCA 5 Instead of fuse use Circuit Breaker Units Power Supply IFM Input W Model Hz Volts Voltage Range MCA MFA kW FLA Cooling Heating PRHR021 50 220 Max 242 Min 198 0 1 15 14 1...

Page 17: ...ow pressure gas valve Close Close Close Liquid valve Mode change timer Changing mode Previous mode 180 sec Heating Cooling mode 120 sec Cooling Heating mode During heating 60 sec During cooling 0 sec Stop or ventilation Cooling or heating 120 sec Cooling or heating Stop or ventilation Balancing valve L P gas valve H P gas valve Mode change timer Operating mode Close Keep Keep 180 timer Heating Clo...

Page 18: ...t the outlet of subcooler during simultaneous operation The degree of subcooler T outlet of subcooler T inlet of subcooler Open or Close Close Keep High pressure gas valve Close Open 60 Hz Running Ending Starting Component 40 Hz Stop Inverter compressor Open or Close Keep Low pressure gas valve Close Open for 30s Balancing valve Are whole indoor units operating cooling mode Solenoid valve open for...

Page 19: ... 19 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 3 PCB Setting ...

Page 20: ...and HR Unit 26 3 Flow Chart for Auto Addressing of Indoor and HR Unit 28 4 Example of Manual Valve Addressing Non Zoning setting 31 5 Example of Manual Valve addressing Zoning setting 32 6 Example of Checking Valve Address 33 7 Identification of Manual Valve ID Address 33 8 Method of checking the pipe detection result at outdoor unit 33 9 Setting method of Master indoor unit in zoning 34 PCB Setti...

Page 21: ...Switch for Setup of HR Unit 1 Selection of the method for pipe detection of an HR unit Auto Manual Auto Manual Switch No 1 On Switch No 1 Off 2 Setting the zoning control ON S W Selection No 1 Method for pipe detection of an HR unit Auto Manual No 2 Model of HR unit No 3 Model of HR unit No 4 Model of HR unit No 5 Valve group setting No 6 Valve group setting No 7 Use only in factory production pre...

Page 22: ...for 2 branches HR unit If you want to use a PRHR041 PRHR041A for 3 branches HR unit after closing the 4th pipes set the dip switch for 3 branches HR unit If you want to use a PRHR041 PRHR041A for 2 branches HR unit after closing the 3rd and 4th pipes set the dip switch for 2 branches HR unit The unused port must be closed with a copper cap not with a plastic cap For 2 branches PRHR021 PRHR021A For...

Page 23: ... 16 1 4 390 15 11 32 I D19 05 3 4 I D19 05 3 4 I D19 05 3 4 I D15 88 5 8 I D12 7 1 2 I D12 7 1 2 I D12 7 1 2 I D12 7 1 2 I D12 7 1 2 I D12 7 1 2 I D12 7 1 2 74 2 29 32 70 2 3 4 70 2 3 4 I D15 88 5 8 I D15 88 5 8 I D25 4 1 I D25 4 1 I D25 4 1 O D25 4 1 80 3 5 32 110 4 11 32 110 4 11 32 332 13 1 16 321 12 5 8 83 3 9 32 1 2 3 3 I D19 05 3 4 I D19 05 3 4 O D19 05 3 4 O D19 05 3 4 2 3 2 3 1 2 O D15 88 ...

Page 24: ...lve in the HR unit Set the address of the valve of the HR unit to the central control address of the connected indoor unit SW01M selection of the valve to address SW03M increase in the digit of 10 of valve address SW04M increase in the last digit of valve address Prerequisite for manual valve addressing central control address of each indoor unit must be preset differ ently at its wired remote con...

Page 25: ...ddress SW04M increase in the last digit of valve address SW05M Rotary S W Prerequisite for manual valve addressing central control address of each indoor unit must be preset differently at its wired remote control S W No Setup No 1 Manual addressing of valve 1 No 2 Manual addressing of valve 2 No 3 Manual addressing of valve 3 No 4 Manual addressing of valve 4 SW03M Increase in the digit of 10 of ...

Page 26: ... indoor unit 2 Auto pipe detection 3 Manual pipe detection Execute in case of Auto pipe detection failure Turn off all the indoor units before auto addressing If indoor unit is operated auto addressing would not be completed 2 Auto pipe detection 1 Turn No 1 of SW02M of HR unit PCB off 2 Confirm that the setting of No 2 3 of SW02M corresponds with the number of indoor units 3 Reset the power of HR...

Page 27: ...anual pipe you should do it on HR unit PCB 6 If an error occurred it means that manual pipe setting is not completed 7 During 5 minutes after pipe detection is completed do not turn off the main unit PCB to save the result of pipe detection automatically WARNING 1 Execute auto addressing and auto pipe detection again whenever the indoor PCB and HR unit PCB is replaced Operation error occurs unless...

Page 28: ...01 02 15 means connection of 15 indoor units and auto addressing is completed normally Auto addressing start Waiting 3 minutes Power On Press RED Button for 10 15sec SW02B 7 segment LED 88 Don t press RED Button SW02B 7 segment LED OK YES NO Check the connections of transmission line 88 The number of the indoor units connected is displayed at 7 SEG of the outdoor unit main PCB after 2 7 minutes Th...

Page 29: ...or unit reset the power of outdoor unit main PCB Press SW03B of the outdoor unit main PCB for 5 seconds 88 is displayed on 7 SEG of the outdoor unit main PCB Outdoor unit is operated for 5 60 minues The number of indoor units detected is displayed for 30 seconds on the outdoor unit PCB after outdoor unit stopped Display error on outdoor unit PCB Display error on HR unit PCB Outdoor unit PCB HR HR ...

Page 30: ...entral control address of the indoor unit connected to the valve Reset the power of outdoor unit PCB Wait for about 5 minutes The number of the indoor units installed is displayed Ex HR The number of the indoor Check the central control address of indoor and HR unit Make sure that reset the outdoor unit power when changing the central control unit Are the number of indoor units connected to the ou...

Page 31: ... None No 1 2 3 4 5 Display and setup Setup and Contents Operation Turn dip S W No 1 on to address valve 1 Display Existing value saved in EEPROM is displayed in 7 SEG Operation Set the digit of 10 to the number in Group High data of the wired remote control connected to the corresponding indoor unit to the valve 1 by pressing left tack S W Display Digit increasing with the times of pressing tack S...

Page 32: ...mple The case where 3 indoor units is connected in piping 1 sets from rotary switch 0 1 2 and 3 4 5 6 7 with FF set Prerequisite for manual valve addressing central control address of each indoor unit must be preset differently at its wired remote control Above setup must be done for all HR unit valves The valve that is not connected with any indoor unit should be addressed with any other number t...

Page 33: ... than 2 dip switches turned on Display Er is displayed in 7 SEG No 1 Display and setup Setup and contents SW01M 6 Example of Checking Valve Address 7 Identification of Manual Valve ID Address 8 Method of checking the pipe detection result at outdoor unit ROTARY 01 ROTARY 02 0 0 1 Wait for 5 minutes after Pipe detection is completed 2 Turn on the No 10 14 16 DIP S W of Sub PCB at master unit 3 Chec...

Page 34: ... in the zoning 6 Set the Master IDU Press the red button during 1 5seconds stop twinkling ROTARY 01 ROTARY 02 0 0 No of Indoor unit No of HR unit branch No of HR unit CAUTION Waiting for 80seconds after power on The zoning information and Master IDU information remove from EEPROM after Auto addressing If there is installed the central control it is impossible setting of Master IDU in zoning 9 Sett...

Page 35: ... 35 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 4 Trouble shooting guide ...

Page 36: ... 36 Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Self diagnosis function 37 Trouble shooting guide ...

Page 37: ...D is also released simultaneously Error Display 1st 2nd LED of 7 segment indicates error number 3rd LED indicates unit number Ex 211 No 21 error of master unit 213 No 21 error of slave2 011 051 No 105 error of master unit Refer to the DX Venitilation manual for DX Venitilation error code Display Title Cause of Error HR unit related error 2 0 0 1 Searching pipe Error Failure of automatic addressing...

Page 38: ...t 220V 10 2 2 After reset of power of outdoor wait for more than 30 minutes temperature of pipes will be cool down then do auto addressing 2 2 While power of HR unit is on check total indoors display CH05 or not Refer to CH05 3 When green LED communication LED of HR unit blinks regularly Check setting of rotary switch and dip switch After reset of power of outdoor and HR unit wait for more than 30...

Page 39: ...ure sensor connection Defective temperature sensor Open Short Defective outdoor unit PCB Error No Error type Error point Main reasons Abnormal value of sensor measurement Open Short HR unit Sub cooling discharge pipe temperature sensor error 203C HR Error diagnosis and countermeasure flow chart HR unit error display No Example of HR unit error display 1 Check connection condition of temperature se...

Page 40: ...cation green LED blink of HR unit PCB 2 If communication green LED blink of HR unit PCB is normal check setting of rotary switch of HR unit and dip switch Refer to CH200 Reset power of outdoor and HR unit If communication error of HR unit occurs it can t be released until reset of outdoor power 3 If communication green LED blink of HR unit PCB is abnormal not blinking just on check communication c...

Page 41: ...P NO MFL67400003 AUGUST 2011 ...