Johnson Controls YCIV0157 Manuals

Manuals and User Guides for Johnson Controls YCIV0157. We have 1 Johnson Controls YCIV0157 manual available for free PDF download: Installation Operation & Maintenance

Johnson Controls YCIV0157 Installation Operation & Maintenance

Johnson Controls YCIV0157 Installation Operation & Maintenance (334 pages)

AIR-COOLED SCREW LIQUID CHILLERS

Brand: Johnson Controls | Category: Chiller | Size: 9 MB

Table of Contents

Table of Contents
5
Section 1 - General Chiller Information and Safety

19
- Introduction
  19
- Warranty
  19
- Safety
  19
  - Standards for Safety
    19
  - Responsibility for Safety
    20
- About this Manual
  20
- Misuse of Equipment
  20
  - Suitability for Application
    20
  - Structural Support
    20
  - Mechanical Strength
    20
  - General Access
    20
  - Pressure Systems
    21
  - Electrical
    21
  - Rotating Parts
    21
  - Sharp Edges
    21
  - Refrigerants and Oils
    21
  - High Temperature and Pressure Cleaning
    21
  - Emergency Shutdown
    21
Section 2 - Product Description

23
- Introduction
  23
  - General System Description
    23
  - Compressor
    24
  - FIGURE 1 - Chiller Control System
    24
  - FIGURE 2 - Compressor
    24
  - Evaporator
    25
  - Condenser
    25
  - Flash Tank Feed Valve/Drain Valves
    26
  - Oil Separator/Oil System
    26
  - Relief Valves
    26
  - Oil Cooling
    27
  - Capacity Control
    27
  - Power and Control Panel
    27
  - Each Power Compartment Contains
    27
  - Microprocessor and VSD Controls
    27
  - Display
    27
  - Keypad
    28
  - Unit Switch
    28
  - Variable Speed Drive (VSD)
    29
  - FIGURE 3 - PWM Current Waveform
    29
  - FIGURE 4 - PWM Voltage Waveform
    29
- Accessories and Options
  30
  - Sound Reduction Options
    30
  - Condenser Coil Protection
    31
  - Protective Chiller Panels
    31
  - Evaporator Options
    32
  - General Options
    32
  - Vibration Isolation
    32
- Complete Pin Number Description
  34
Section 3 - Rigging, Handling and Storage

39
- Lifting Weights
  39
- Delivery and Storage
  39
- Inspection
  39
- Moving the Chiller
  40
- Unit Removal from Shipping Container
  40
- Lifting Using Lugs
  40
- Lifting Using Shackles
  40
Section 4 - Installation

43
- Location Requirements
  43
- Outdoor Installations
  43
- Indoor Installations
  43
- Location Clearances
  43
- Vibration Isolators
  44
  - Installation
    44
- Shipping Braces
  44
- Chilled Liquid Piping
  44
  - General Requirements
    44
- Water Treatment
  45
- Pipework Arrangement
  46
- Connection Types and Sizes
  46
- Cooler Connections
  46
  - Option Flanges
    46
- Refrigerant Relief Valve Piping
  46
- FIGURE 5 - Pipework Arrangement
  46
- FIGURE 6 - Victaulic Groove
  46
- FIGURE 7 - Flange Attachment
  46
- Ductwork Connection
  47
  - General Requirements
    47
- Electrical Connection
  47
- Power Wiring
  48
- Power Supply Wiring
  48
- 115VAC Control Supply Transformer
  48
- Control Panel Wiring
  48
- Volts Free Contacts
  49
  - Chilled Liquid Pump Starter
    49
  - Run Contact
    49
  - Alarm Contacts
    49
- System Inputs
  49
  - Flow Switch
    49
  - Remote Run / Stop
    49
  - Remote Print
    49
  - Optional Remote Setpoint Offset - Temperature
    49
  - Optional Remote Setpoint Offset - Current
    49
  - Section 6 - Technical Data
    61
  - Water Pressure Drop Charts
    61
  - Glycol Correction Factors
    65
  - Water Temperature and Flows
    66
  - Physical Data (English - Standard Efficiency)
    68
  - Physical Data (English - High Efficiency)
    70
  - Physical Data (si - Standard Efficiency)
    72
  - Physical Data (si - High Efficiency)
    74
  - Electrical Data
    76
  - Compressor Power Wiring Connections
    76
  - FIGURE 8 - Two Compressor Wiring Diagram with Circuit Breaker
    76
  - FIGURE 9 - Two Compressor Wiring Diagram with Terminal Block
    76
  - Compressor Power Wiring Connections
    77
  - FIGURE 10 - Three Compressor Wiring Diagram with Circuit Breaker - Single Point
    77
  - FIGURE 11 - Three Compressor Wiring Diagram with Terminal Block - Single Point
    77
  - Standard Efficiency 2-Compressor Units
    78
  - High Efficiency 2-Compressor Units
    82
  - Standard Efficiency 3-Compressor Units
    86
  - High Efficiency 3-Compressor Units
    88
  - Electrical Notes
    90
  - Electrical Wiring Diagrams - 2 Compressor Models
    92
  - FIGURE 12 - Elementary Control Wiring Diagram 2 Compressor Models
    92
  - Elementary Power Wiring Diagram
    94
  - FIGURE 13 - Elementary Power Wiring Diagram - YCIV0157-0267 2 Compressor Models
    94
  - Power Wiring Connection Diagram
    96
  - FIGURE 14 - Power Wiring Connection Diagram - YCIV0157-0267 2 Compressor Models
    96
  - Control Wiring Connection Diagram
    98
  - FIGURE 15 - Control Wiring Connection Diagram - YCIV0157-0267 2 Compressor Models
    98
  - Power Elementary Wiring Diagram
    101
  - FIGURE 16 - Power Elementary Wiring Diagram - YCIV0157-0267 2 Compressor Models
    101
  - Location Label - 2 Compressor Models
    103
  - Panel Layout - 2 Compressor Models
    104
  - Electrical Wiring Diagrams - 3 Compressor Models
    106
  - FIGURE 17 - Control Elementary Diagram - YCIV0257-0397 3 Compressor Models
    106
  - Power Elementary Diagram
    110
  - FIGURE 18 - Power Elementary Diagram - YCIV0257-0397 3 Compressor Models
    110
  - Control Wiring Connection Diagram
    112
  - FIGURE 19 - Control Wiring Connection Diagram - YCIV0257-0397 3 Compressor Models
    112
  - Power Wiring Connection Diagram
    116
  - FIGURE 20 - Power Wiring Connection Diagram - YCIV1050-1500 3 Compressor Models
    116
  - Power Elementary Diagram
    120
  - FIGURE 21 - Power Elementary Diagram - YCIV0257-0397 3 Compressor Models
    120
  - Location Label - 3 Compressor Models
    122
  - Panel Layout - 3 Compressor Models
    123
  - Dimensions - 2 and 3 Compressor si
    124
  - Technical Data - Clearances
    144
  - Isolator Selection and Mounting
    145
  - Isolator Information for Units Shipped on or after June 15, 2008
    145
  - One Inch Deflection Spring Isolators Cross-Reference
    162
  - One Inch Deflection Spring Isolators Installation Instructions
    163
  - Durulene Isolator Cross-Reference
    164
  - Installation of Durulene Vibration Isolators
    165
  - Seismic Isolator Cross-Reference
    166
  - Seismic Isolator Installation and Adjustment
    167
  - Isolator Information for Units Shipped before June 15, 2008
    168
  - SLRS Seismic Isolator Specifications
    168
  - SLRS Seismic Isolator Installation and Adjustment
    169
  - To Install and Adjust Mounts
    169
  - ND-X Neoprene Isolator Specifications
    170
  - Installation of Neoprene Mounts
    170
  - CIP 1" Deflection Restrained Mounting Specifications
    171
  - Installation of 1" Deflection Mounts
    172
  - Refrigerant Flow Diagram
    173
  - FIGURE 22 - Refrigerant Flow Diagram
    173
  - Process and Instrumentation Diagram
    174
  - FIGURE 23 - Process and Instrumentation Diagram
    174
  - Component Locations
    175
  - FIGURE 24 - Component Locations
    175
  - FIGURE 25 - Control and VSD Cabinet Components
    176
  - FIGURE 26 - Chiller Control Board, Relay Boards, Microgateway, and Optional Circuit Breaker
    177
  - FIGURE 27 - Chiller Control Board, Relay Boards, and Microgateway, 2 Compressor
    178
  - FIGURE 28 - Chiller Control Board, Relay Boards, and Microgateway, 3 Compressor
    179
  - FIGURE 29 - VSD Logic Board
    180
  - FIGURE 30 - VSD Logic Board (Original - Obsolete), P/N 031-02477-000
    181
  - FIGURE 31 - VSD Logic Board (New), P/N 031-02507-XXX
    182
  - FIGURE 32 - Power Components, 2 Compressor
    183
  - FIGURE 33 - Power Components, 3 Compressor
    184
  - FIGURE 34 - Fan Contactors and 3T Transformer, 2 Compressor
    185
  - FIGURE 35 - Fan Contactors, 3 Compressor
    186
  - FIGURE 36 - VSD Components
    187
  - FIGURE 37 - VSD Components, 2 Compressor
    188
  - FIGURE 38 - VSD Components, 3 Compressor
    189
  - FIGURE 39 - VSD Components, 2 Compressor
    190
  - FIGURE 40 - VSD Components, 3 Compressor
    191
  - FIGURE 41 - Inverter Power Components, 2 Compressor
    192
  - FIGURE 42 - Inverter Power Components, 3 Compressor
    193
  - FIGURE 43 - Inverter Power Components
    194
  - Glycol System Components
    196
  - FIGURE 44 - Glycol Pump and Fill Tube Locations
    196
  - FIGURE 45 - Glycol Piping and Fill Tube Location
    197
  - Compressor Components
    198
  - FIGURE 46 - Compressor Components
    198
  - Chiller Electronic Components
    199
  - Keypad
    199
  - Keypad Data Entry Mode
    200
  - Display
    200
  - Relay Output Boards
    201
  - VSD (Variable Speed Drive)
    202
  - AC to DC Rectifier
    202
  - SCR Trigger Board
    202
  - DC Link Filter
    202
  - 1L Line Inductor
    203
  - DC to AC Inverter
    203
  - Laminated Bus Structure
    204
  - VSD Logic Board
    204
  - FIGURE 47 - New Board P/N 031-02507-000
    204
  - FIGURE 48 - Obsolete Board P/N 031-02477-000
    204
  - Control Panel to VSD Communications
    205
  - IGBT Gate Driver Boards
    205
  - Current Transformers
    206
  - DV/DT Output Suppression Network
    206
  - Flash Tank Feed and Drain Valve Controller
    206
  - DC Bus Voltage Isolation Board
    207
  - Chiller Circuit Breaker
    207
  - Chiller Configuration Jumpers
    207
  - Number of Compressors Configuration Jumper
    207
  - TABLE 1 - Compressors and the Appropriate Jumper Positions
    207
  - VSD Logic to Chiller Microprocessor Board RS-485 Communication Configuration Jumpers
    208
  - Maximum VSD Frequency/Model Designator
    208
  - TABLE 2 - VSD Logic Board Address Jumper
    208
  - TABLE 3 - Maximum Frequency / Model Designator Jumper
    208
  - Section 7 - Operation
    209
  - Operating Controls
    209
  - Anti-Recycle Timer
    209
  - Evaporator Pump Control
    209
  - Evaporator Heater Control
    209
  - Pumpdown Control
    209
  - Compressor Heater Control
    209
  - Alarms
    209
  - Chiller Run Contact
    209
  - Unit Switch
    210
  - Basic Operating Sequence
    210
  - Start Sequence and Loading
    210
  - Number of Compressors to Start
    211
  - General
    211
  - Standard IPLV
    211
  - Optional Optimized High IPLV
    211
  - FIGURE 49 - Chiller Control (Cooling) Range
    211
  - Minimum VSD Compressor Start / Run Frequency
    212
  - Minimum VSD Start Frequency
    212
  - Minimum VSD Run Frequency
    212
  - FIGURE 50 - Number of Compressors to Start
    212
  - FIGURE 51 - Minimum VSD Start Frequency
    212
  - Acceleration / Deceleration Rate When Starting / Stopping Compressors
    213
  - VSD Acceleration and Deceleration Rates
    213
  - Standard IPLV Capacity Control
    213
  - FIGURE 52 - Minimum VSD Run Frequency
    213
  - Fuzzy Logic Control
    214
  - Hot Water Starts
    215
  - Lag Compressor Operation in Load Limiting
    215
  - Optional High IPLV Capacity Control
    215
  - TABLE 4 - Fuzzy Logic Loading/Unloading Vs. Error
    215
  - Fuzzy Logic Control
    217
  - TABLE 5 - Fuzzy Logic Loading/Unloading Vs. Error
    217
  - Hot Water Starts
    218
  - Load Limiting Control
    218
  - Load Limiting
    218
  - Motor Current Load Limiting/Unloading
    218
  - Discharge Pressure Load Limiting/Unloading
    218
  - TABLE 6 - Current Limit Load Limiting/Unloading
    218
  - Suction Pressure Load Limiting/Unloading
    219
  - VSD Internal Ambient Temperature Load Limiting
    219
  - VSD Baseplate Temperature Load Limiting
    219
  - TABLE 7 - Discharge Pressure Load Limiting/Unloading
    219
  - TABLE 8 - Suction Pressure Load Limiting/Unloading
    219
  - TABLE 9 - VSD Internal Ambient Load Limiting/Unloading
    219
  - Flash Tank Drain and Feed Valve Controller
    220
  - Valve Controller and Control Algorithm Operation
    220
  - FIGURE 53 - Flash Tank Drain and Feed Valve Controller
    220
  - TABLE 10 - VSD Baseplate Temperature Load Limiting/Unloading
    220
  - MOP Setpoint Control for Hot Water Starts
    221
  - Moderate to High Ambient MOP Setpoint Control
    221
  - Low Ambient MOP Setpoint Control
    221
  - Actual MOP Setpoint
    221
  - Valve Controller Led's
    222
  - FIGURE 54 - LED Locations
    222
  - FIGURE 55 - Power and Comms Led's
    222
  - FIGURE 56 - Power, Comms and System Open/Close Led's
    222
  - Economizer Control
    223
  - Condenser Fan Control
    224
  - FIGURE 57 - Condenser Fan Locations
    224
  - TABLE 11 - Fan Stages and Corresponding Outputs
    224
  - Standard IPLV Fan Control
    225
  - Optimized IPLV Fan Control
    225
  - High VSD Cabinet Ambient Temperature Fan Operation
    225
  - VSD Temperature Control, Operation of the Coolant Pump, and VSD Cabinet Cooling Fans
    225
  - FIGURE 58 - Standard IPLV Fan Control
    225
  - FIGURE 59 - High IPLV Fan Control
    225
  - Remote Temperature Reset Control
    226
  - Temperature Reset Control
    226
  - Remote ISN Setpoint Control
    226
  - Remote Temperature Reset
    226
  - Local Current Limit Control
    227
  - Pulldown Current Limit Setpoint
    227
  - Remote Current Limit Reset Control
    227
  - Remote ISN Current Limit Setpoint
    228
  - Remote Current Limit Reset
    228
  - Sound Limit Control
    229
  - Sound Limiting and Local Sound Limit Setpoint
    229
  - ISN Sound Limit Setpoint
    229
  - Remote Sound Limit
    229
  - Section 8 - Micropanel
    231
  - VSD Operation and Controls
    231
  - VSD Logic Board
    231
  - VSD Start/Run Initiation
    231
  - PWM Generator Type and Carrier Frequency
    231
  - Short Circuit Protection Minimum Output Pulse Width and Interlock Delay
    231
  - Modulating Frequency
    231
  - Maximum VSD Frequency
    232
  - VSD % Modulation
    232
  - VSD Cooling and Cooling Loop
    232
  - IGBT Module Baseplate Temperature Sensing
    233
  - VSD Internal Ambient Temperature Sensing
    234
  - Pre-Charge
    234
  - Run Mode / Unit Restart
    234
  - DC Bus Voltage Sensing and Scaling
    235
  - Current Sensing and Scaling
    235
  - VSD Transmitted Operating Parameters
    235
  - VSD Safeties (Faults)
    235
  - TABLE 12 - VSD Operating Display Parameters
    235
  - Pre-Charge Low DC Bus Voltage (Software) Fault
    236
  - Pre-Charge DC Bus Voltage Imbalance (Software) Fault
    237
  - High DC Bus Voltage (Hardware) Fault
    237
  - Low DC Bus Voltage (Software) Fault
    237
  - DC Bus Voltage Imbalance (Software) Fault
    237
  - High Motor Current (Hardware) Fault
    238
  - Motor Current Overload (Software) Fault
    238
  - Motor Current Overload (Hardware) Fault
    238
  - IGBT Gate Driver (Hardware) Fault
    238
  - High Baseplate Temperature (Software) Fault
    239
  - High VSD Internal Ambient Temperature (Software) Fault
    239
  - Single Phase Input (Hardware) Fault
    239
  - Power Supply (Hardware) Fault
    240
  - Run Relay (Software) Fault
    240
  - VSD Logic Board Failure (Software) Fault
    240
  - VSD CT Plug (Hardware) Fault
    240
  - VSD Fault Data
    240
  - Fault Relay/Fault Acknowledge Bit
    241
  - VSD Fault Compressor Start Inhibit
    241
  - Unit Warnings
    241
  - Unit Warning Operation
    241
  - Low Battery Warning
    241
  - Invalid Number of Compressors Warning
    242
  - Invalid Serial Number Warning
    242
  - Optimized Efficiency Disabled
    242
  - Unit Safeties
    243
  - Unit Safety Operation
    243
  - High Ambient Temp Fault
    243
  - Low Ambient Temp Fault
    243
  - Low Leaving Chilled Liquid Temp Fault
    243
  - VSD Communications Failure Fault
    244
  - System Safeties (Faults)
    244
  - System Safety (Fault) Operation
    244
  - High Discharge Pressure Cutout (Software) Fault
    245
  - High Discharge Pressure Cutout (HPCO) (Hardware) Fault
    245
  - Low Suction Pressure Cutout (Software) Fault
    245
  - Low Motor Current Cutout Fault
    245
  - High Differential Oil Pressure Cutout Fault
    246
  - Low Differential Oil Pressure Cutout Fault
    246
  - High Discharge Temperature Cutout Fault
    246
  - High Oil Temperature Cutout Fault
    246
  - TABLE 13 - Low Differential Oil Pressure Cutout
    246
  - Low Suction Superheat Cutout Fault
    247
  - Low Discharge Superheat Cutout Fault
    247
  - Sensor Failure Cutout Fault
    247
  - High Motor Temperature Cutout Fault
    248
  - High Flash Tank Level Cutout Fault
    248
  - System Control Voltage Cutout Fault
    248
  - TABLE 14 - Start Inhibit Sensor Thresholds
    248
  - Status Key
    249
  - Status Key Operation
    249
  - General Status Messages
    250
  - Unit Safety (Fault) Status Messages
    251
  - System Safety (Fault) Status Messages
    251
  - VSD Safety (Fault) Status Messages
    251
  - Unit Warning Messages
    251
  - Unit Data Key
    252
  - General
    252
  - Unit Data Key Operation
    252
  - System Data Keys 1 through 4
    254
  - General
    254
  - System 1 Data Key Operation
    254
  - System 2 through 4 Data Key Operation
    255
  - Sensor Displays
    256
  - TABLE 15 - Sensor Min/Max Outputs
    256
  - VSD Data Key
    257
  - General
    257
  - VSD Data Key Operation
    257
  - Operating Hours / Start Counter Key
    259
  - History Key
    260
  - History Key Operation
    260
  - Normal Shutdowns History
    260
  - Fault Shutdowns History
    261
  - Status Fault Type
    261
  - Unit Fault Type
    261
  - All Fault Data
    261
  - Unit Data
    262
  - VSD Data
    262
  - System Data
    263
  - Compressor Operating Hours and Starts
    264
  - Chilled Liquid Setpoint Cooling Setpoints
    265
  - Options
    265
  - Remote Temperature Reset
    265
  - Program Values
    266
  - Pulldown Current Limit
    266
  - Setpoints Key
    267
  - Setpoints Key Operation
    267
  - TABLE 16 - Setpoint Limits
    268
  - Program Key
    269
  - Program Key Operation
    269
  - Suction Pressure Cutout
    269
  - Low Ambient Cutout
    270
  - Low Leaving Liquid Temp Cutout
    270
  - Motor Current Limit
    270
  - Pulldown Current Limit
    270
  - Pulldown Current Limit Time
    270
  - Suction Superheat Setpoint
    270
  - Unit ID Number
    270
  - Sound Limit Setpoint
    271
  - Default Values
    271
  - TABLE 17 - Programmable Operating Parameters
    271
  - Options Key
    272
  - Options Key Operation
    272
  - Display Language Selection
    272
  - Chilled Liquid Cooling Mode Selection
    272
  - Local / Remote Control Mode Selection
    273
  - Display Units Selection
    273
  - System Lead/Lag Control Mode Selection
    273
  - Remote Temperature Reset Selection
    274
  - Remote Current Limit Input Selection
    274
  - Remote Sound Limit Selection
    274
  - Low Ambient Cutout Enable/Disable
    274
  - Date / Time and Schedule Keys
    275
  - Date/Time Key Operation
    275
  - Schedule Key Operation
    276
  - Unit Operating Schedule
    277
  - Sound Limit Schedule
    278
  - Manual Override Key
    279
  - Manual Overrride Key Operation
    279
  - Print Key
    280
  - Print Key Operation
    280
  - TABLE 18 - Printout Types
    280
  - Operating Data Printout
    281
  - History Data Printout
    282
  - Service Key
    283
  - Service Key Operation
    283
  - System Switches Key
    289
  - System Switches Key Operation
    289
  - Serial Number Programming
    290
  - Enabling Optimized High IPLV Mode
    291
  - Unit Setup Mode
    292
  - TABLE 19 - Unit Setup Programmable Values
    292
  - Default Programmable Values
    293
  - Serial Port Connections
    293
  - Analog Input Connections
    294
  - TABLE 20 - Serial Port Connections
    294
  - TABLE 21 - Analog Input Connections
    294
  - Digital Intput Connections
    296
  - TABLE 22 - Digital Input Connections
    296
  - Analog Output Connections
    297
  - TABLE 23 - Analog Output Connections
    297
  - Digital Output Connections
    298
  - TABLE 24 - Digital Output Connections
    298
  - BACNET, MODBUS and YORKTALK 2 Communications
    300
  - FIGURE 60 - Control Board Connections
    301
  - TABLE 25 - Minimum, Maximum and Default Values
    301
  - TABLE 26 - Values Required for BAS Communication
    302
  - TABLE 27 - Real Time Error Numbers
    302
  - Bacnet and Modbus Communications
    303
  - Communications Data Map Notes
    303
  - TABLE 28 - Bacnet and Modbus Communications Data Map
    304
  - Yorktalk 2 Communications
    309
  - TABLE 29 - Yorktalk 2 Communications Data Map
    310
  - Section 9 - Maintenance
    313
  - General Requirements
    313
  - Daily Maintenance
    313
  - Unit Status
    313
  - Refrigerant Leaks
    313
  - Operating Conditions
    313
  - Compressor Oil Level
    313
  - Refrigerant Charge
    313
  - Scheduled Maintenance
    313
  - Chiller / Compressor Operating Log
    313
  - R-134A Conversion Tables
    314
  - TABLE 30 - R-134A Pressure to Saturated Temperature Conversion
    314
  - Maintenance Requirements for YCIV Chillers
    315
  - Troubleshooting Guide
    316
  - Limited Warranty
    318
  - Warranty on New Equipment
    318
  - Warranty on Reconditioned or Replacement Materials
    318
  - Chilled Liquid and Suction Temperature Sensor Input Voltage
    319
  - TABLE 31 - Temperature Input Voltage Sensor (Measured Signal to Shield at the Sensor)
    319
  - TABLE 32 - Outside Air Temperature Sensor Input Voltage (Measured Signal to Shield at the Sensor)
    320
  - TABLE 33 - Pressure Transducer Output Voltage (Measured Signal to Return at the Transducer)
    321
  - TABLE 34 - Motor Temperature Sensor Resistance (Check at the Motor)
    322
  - TABLE 35 - Compressor Motor Overload Settings and Max. VSD Frequency
    323
  - Printer Wiring
    326
  - FIGURE 61 - Print Cable - Chiller to Serial Printer
    326
  - Printer Cables
    327
  - Printer Setup
    327
  - Okidata 184
    327
  - Weigh-Tronix IMP 24 Model 2600
    327
  - Seiko
    327
  - Operating Log Sheet
    328
  - Site and Chiller Information
    328
  - Programmed Values
    328
  - System Operating Conditions
    330
  - Water System Conditions
    331
  - Condenser Conditions
    331
  - Recommended Spare Parts
    332

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