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A.O. Smith AWHS Series Technical Manual
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A.O. Smith AWHS Series Technical Manual

High efficiency air to water heat pumps
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HIGH EFFICIENCY AIR TO WATER HEAT PUMPS
AWHS
LHA P2U/P2S
SERIES
TECHNICAL MANUAL
Multiple instructions:
the instructions before
the unit
Rev. C 11-2022
Rev. C 11-2022

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Summary of Contents for A.O. Smith AWHS Series

  • Page 1 HIGH EFFICIENCY AIR TO WATER HEAT PUMPS AWHS LHA P2U/P2S SERIES TECHNICAL MANUAL Multiple instructions: the instructions before the unit Rev. C 11-2022 Rev. C 11-2022...
  • Page 2 AWHS LHA P2U/P2S Declaration of conformity MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 3 ..............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 4 6.6 CIRC ............................................................................................................................................................................................................................................................................................................................8.1 Disconnect the unit ..................................................................................................................................................MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 5 1.2 Aim and content of the manual instructions. 1.3 How to store this manual user. 1.4 Manual Update 1.5 How to use this manual MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 6 METHOD OF INJURY PRECAUTIONS RISK RISK Burns. severe burns. unit enclosure severe burns. unit. severe burns. open. Entire unit Entire unit MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 7 AWHS LHA P2U/P2S 1.7 General Description of Symbols Used BANNED WARNING ACTION REQUIRED MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 8 MOVING PARTS HOT SURFACES SHARP SURFACES EARTH CONNECTION READ AND UNDERSTAND THE INSTRUCTIONS RECOVER OR RECYCLE MATERIAL 1.9 Limitations and prohibited use MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 9 Weight Contiene gas fluorurati ad effetto serra disciplinati dal protocollo di Kyoto Contains fluorinated greenhouse gasses covered by the Kyoto protocol MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 10 2.1.3 Persistence and degradation 2.1.4 Effects of discharges 2.1.5 Exposure controls and personal protection 2.1.6 Professional exposure limits R410A 2.2 Refrigerant handling MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 11 2.5.4 Ingestion 2.6 First Aid Measures 2.6.1 Inhalation 2.6.2 Contact with skin 2.6.3 Contact with eyes 2.6.4 Ingestion 2.6.5 Further medical treatment MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 12 3.1 Unit description 3.1.1 Frame 3.1.2 Refrigerant circuit 3.1.3 Compressors 3.1.4 Source heat exchanger 3.1.5 User heat exchangers protection. 3.1.6 Fans 3.1.7 Microprocessors MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 13 3.2.5 HA Version 3.2.6 Standard Version 3.2.6 HE Version 3.2.7 Version LS 3.2.7 SLN version 3.2.8 HA/XL HE/XL Super low noise version MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 14 3.3.10 Integrated hydraulic kit 1 pump + Water tank 3.3.10 Integrated hydraulic kit 1 pump + Water tank (A1ZZU) 3.3.11 Integrated hydraulic kit 2 pumps + Water tank MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 15 3.3.13 Hydraulic kit with two pumps without tank - user circuit (A2NTU) 3.3.14 Cascade control system (SGRS) 3.3.15 Fan speed control (DCCF) This MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 16 R410A R410A R410A R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 1000 1000 1000 1000 on the unit. MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 17 R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 1000 1000 1000 1000 1000 1000 1000 on the unit. MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 18 R410A R410A R410A R410A 2088 2088 2088 2088 2088 2088 2088 1000 1000 1000 1000 1000 1000 1000 on the unit. MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 19 3.6.2 User hot water temperature (Winter operation) 3.6.2 User hot water temperature (Winter operation) 3.6.3 Cold water temperature (RV versions Only) 3.6.4 Ambient air temperature MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 20 AWHS LHA P2U/P2S MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 21 AWHS LHA P2U/P2S 3.6 Domestic hot water production 3.6.1 Solution 1 MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 22 This is the solution for existing buildings or for those applications where it is not possible to remove existing plants. possibility of using the existing DHW tank. COLD WATER in the tank. AS MUCH AS POSSIBLE MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 23 0.00005 0.0001 0.0002 CCCP 0.98 0.94 IPCF 0.98 0.95 CCCP = Cooling capacity correction factor IPCF = Input power correction factor MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 24 Octave bands (Hz) Mod. dB(A) dB(A) SE / LS HA / LS Octave bands (Hz) Mod. dB(A) dB(A) STANDARD HE / LS MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 25 AWHS LHA P2U/P2S ACF / SLN HA / XL Octave bands (Hz) Mod. dB(A) dB(A) HE/ XL MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 26 4. INSTALLATION 4.1 General safety guidelines and and use of symbols tion. 4.2 Health and safety Considerations 4.3 Personal protective equipment MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 27 AWHS LHA P2U/P2S 4.4 Inspection In Case of Damage 4.5 Storage 4.5.1 Shipment 4.6 Unpacking 4.7 Lifting and handling MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 28 1500 1500 1500 1500 1500 1500 1500 G (mm) HA-HE/XL 2000 2000 2000 2000 2000 2000 2000 2000 H (mm) HA-HE/XL MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 29 4.9 Installation of rubber vibration dampers sez A - A ØM ØD ØE Mod. Mod. 2504÷5004 230÷465 4.10 Serial interface card RS485 (INSE) MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 30 AWHS LHA P2U/P2S 4.11 Installation of condensate drip tray (BRCA) 4.11.1 Installation of the heating cable MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 31 4.13 Chemical characteristics of the water Total Hardness Electric conductibility Sulphur ion None Chlorine ions Ammonia ion None Sulphuric acid ions Silicon ion Total Iron MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 32 4.14.3 A1NTU - A2NTU 4.14.3 Hydraulic kit with one pump without tank - Hydraulic kit with two pumps without tank User Circuit MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 33 4.17 Filling the hydraulic circuit • • • • • 4.18 Emptying the installation • • • MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 34 4.19.1 Combined heating / Cooling / Domestic hot water production – 2 pipe system P2S User circuit sensor The plant components supplied by the company are: STANDARD OPTIONS NOT AVAILABLE User circuit sensor MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 35 AWHS LHA P2U/P2S 4.20 Electric connections: preliminary safety information FROST PROTECTION MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 36 4.22 Electric connections 4.22.1 Power supply and electrical connections 4.22.2 Remote wiring connections (compulsory) USER CIRCUIT WATER INLET SENSOR (BTI) MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 37 4.22.3 Remote wiring connections (optional) 3 WAY ON/OFF VALVE REMOTE ON / OFF REMOTE SUMMER / WINTER CHANGE OVER REMOTE GENERAL ALARM 90-91-92. MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 38 USER CIRCUIT ELECTRIC INTEGRATION HEATERS DOMESTIC HOT WATER ELECTRIC INTEGRATION HEATERS HEATING CABLE HEATING CABLE WEATHER COMPENSATED SENSOR (BTE) USER CIRCUIT FLOW SWITCH (SFW1) MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 39 4.24 Positioning of the domestic hot water circuit sensor (BTS) Correct positioning of the BTS sensor Incorrect positioning of the BTS sensor MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 40 LHA P2U/P2S 4.25 Refrigerant circuit layout P2U Version Without DHW option P2S Version With DHW option EXV 2 EXV 3 EXV 1 MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 41 AWHS LHA P2U/P2S P2U Version Without DHW option P2S Version With DHW option EXV 2 EXV 3 EXV 1 MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 42 5. UNIT START UP 5.1 Preliminary checks 5.1.1 Before start-up • • • • • • • • • • • • • MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 43 5.1.2 Device Set-point Differential Reset Device Set-point Differential Reset ----- ----- ----- support. 5.1.3 Controls during unit operation • • • MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 44 Indicates that the defrost is active. Unloading function (not available). Only cooling mode (chiller) Heat pump mode Domestico hot water mode MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 45 30.0 °C Evaporator outlet temperature °C 35.0 External air temp. (FC) °C San. water temperature 50.0 °C PROBES ALARM SERVICE CIRC. MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 46 AWHS LHA P2U/P2S 5.4 Remote keyboard connection ENTER ENTER • • 5.4.1 Wall mounting connection diagram MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 47 6.1 Switch the unit on Unit 6.1.1 Switch the unit on from the keyboard Cooling mode Heating mode Domestic hot water mode MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 48 °C 31.8 31.8 San. water temperature San. water temperature 47.6 °C 47.6 °C PROBES ALARM SERVICE CIRC. PROBES ALARM SERVICE CIRC. MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 49 San. water temperature 50.0 °C ALARM PROBES ALARM SERVICE CIRC. press T7 Once the 6.3.1 Adjustable parameters Function Adjustment limit Default value MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 50 Evaporator outlet temperature °C External air temp. (FC) 50.0 °C San. water temperature PROBES ALARM SERVICE CIRC. RESET ESC RST ALL MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 51 Circuit 1 Circuit 1 High press. High press. Low press. Low press. Circuit Circuit 1 1 36.2 bar N.C. ALARM ALARM MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 52 SERVICE CIRC. EXIT ENTER Service Service Service Service 1st level pass 2nd level pass Enter 0 0 0 EXIT ENTER EXIT ENTER MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 53 AWHS LHA P2U/P2S ALARM ENTER ALARM ENTER MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 54 ALARM SP: Setup SP: Setup Parameter programming Parameter programming 1st level 1st level SP14 Serial address Serial address ALARM ENTER ALARM MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 55 Sd02 10.0 °C Sd03 °C Sd04 20.0 °C Max increase in chiller dynamic set ALARM ALARM ENTER Press Weather compensated function MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 56 Parameter programming FS02 1st level 1st level FS03 45.0 °C FS04 °C Sanitary water priority Sanitary water priority ALARM ENTER ALARM EXIT MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 57 Circuit 1 Circuit 1 Hour Start-up Comp 1 Circuit 1 Comp 2 Circuit 2 RESET RESET ALARM ENTER ENB/DIS HOURS STARTS MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 58 Alarm log b1HP b1HP High pressure circuit 1 10:12 13/09/2016 b1AC b1AC 11:32 13/09/2016 Antifreeze circuit 1 summer mode RST ALL ALARM MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 59 Combined defrost end set Combined defrost end set ALARM EXIT ALARM EXIT 6.7.8 Eletrical heater Heaters Heaters Liquid solenoid valves Liquid solenoid valves ALARM MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 60 50.0 °C 60.0 °C Security set point 50.0 °C San. water sec. t. 17.6 °C ALARM ALARM 6.8 Acoustic signal silencing MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 61 AWHS LHA P2U/P2S 7. MAINTENANCE OF THE UNIT 7.1 General warnings • • • 7.2 Drive access MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 62 AWHS LHA P2U/P2S 7.3 Scheduled maintenance Search for leaks CASE Visual Inspection Pressure Test 7.4 Periodical checks and start up MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 63 Action to be performed As neces- 7.4.2 Condensing coils and fans Frequency Action to be performed As neces- present every three months or more MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 64 AWHS LHA P2U/P2S 7.4.3 Compressors Frequency Action to be performed As neces- service. MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 65 • • • • • 8. DECOMMISSIONING 8.1 Disconnect the unit • • • • • 8.2 Disposal, recovery and recycling MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 66 8.3 RAEE Directive (only UE) 9. DIAGNOSIS AND TROUBLESHOOTING Unit alarms Code Visualization Alarm Description Cause Solution ACF1..ACF19 AEFL ACFL AEUn AHFL MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 67 AP21...AP27 AtC1 AtC1 AtE1 AtE2 AEht AEM1 AEM2 AFFC Atrb ALc1 ALc2 nection of the sensor to the Probe fault sensor MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 68 Cause Solution Restore the correct user B(n)HP b(n)AC b(n)AH stet point. b(n)dF Restore the correct user b(n)hP B(n)LP b(n)lP b(n)tF b(n)Cu MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...
  • Page 69 Visualization Alarm Description Cause Solution C(n)tr C(n)oP C(n)dt Other alarms Visualization Alarm Description Cause Solution Termostatic expansion valves AL! Flowmeter transd. MTEC.4002.GB-C-92 Operation and maintenance manual AWHS series English MTEC.4002.GB-C-1 Operation and maintenance manual LHA series English Rev. C 11-2022...

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