Carrier XRV PIC II System Functions, Normal Control mode occurs when Active Delta T, Mode IGV VFD

Page 33

PIC II System Functions

NOTE: Words not part of paragraph headings and printed in all capital letters can be viewed on the CVC/ICVC (e.g., LOCAL, CCN, RUNNING, ALARM, etc.). Words printed both in all capital letters and italics can also be viewed on the CVC/ICVC and are parameters (CONTROL MODE, TARGET GUIDE VANE POS, etc.) with associated values (e.g., modes, tempera- tures, pressures, percentages, on, off, enable, disable, etc.). Words printed in all capital letters and in a box represent soft-

keys on the CVC/ICVC (e.g., ENTER and EXIT ). See Table 2 for examples of the type of information that can appear on the CVC/ICVC screens. Figures 14-20 give an overview of CVC/ICVC operations and menus.

CAPACITY CONTROL FIXED SPEED — The PIC II con- trols the chiller capacity by modulating the inlet guide vanes in response to chilled water temperature deviation from the CON- TROL POINT. The CONTROL POINT may be changed by a CCN network device or is determined by the PIC II adding any active chilled water reset to the SET POINT. The PIC II uses the PROPORTIONAL INC (Increase) BAND, PROPOR- TIONAL DEC (Decrease) BAND, and the PROPORTIONAL ECW (Entering Chilled Water) GAIN to determine how fast or slow to respond. CONTROL POINT may be viewed or over- ridden from the MAINSTAT screen.

CAPACITY CONTROL VFD — The PIC II controls the machine capacity by modulating the motor speed and inlet guide vanes in response to chilled water temperature deviation from the CONTROL POINT. The controller will maintain the highest inlet guide vane setting at the lowest speed to maxi- mize efficiency while avoiding surge. The CONTROL POINT may be changed by a CCN network device or is determined by the PIC II adding any active chilled water reset to the to the SET POINT. CONTROL POINT may be viewed or overridden from the MAINSTAT screen. The PIC II uses the PROPOR- TIONAL INC (Increase) BAND, PROP DEC (Decrease) BAND, and the PROPORTIONAL ECW (Entering Chilled Water) GAIN to determine how fast or slow it takes the system to respond. The VFD GAIN allows for additional adjustment of the VFD response. At start-up, the inlet guide vanes (IGV) start in the closed position and the VFD ramps to its minimum speed setting.

The PIC II controller then initiates the Capacity Control al- gorithm to maintain the chilled water temperature at the CON- TROL POINT. During operation when the CONTROL POINT is not met, the controller will establish a GUIDE VANE DELTA which will either affect a percentage change to the GUIDE VANES or the VFD TARGET SPEED. Any change that will be made to the IGV position or the VFD SPEED will depend on whether the GUIDE VANE DELTA is positive or negative, and the status of the Surge Control Algorithm. The Surge Control Algorithm determines if the chiller should operate in Normal Mode or Surge Prevention Mode. The logic for how the IGV’s and VFD SPEED will be affected by the GUIDE VANE DEL- TA and the Surge Control Algorithm can be seen below:

 

 

NORMAL

 

SURGE

GUIDE VANE

CONTROL

PREVENTION

DELTA

MODE

 

MODE

 

 

IGV

VFD

IGV

 

VFD

From +0.2 to +2.0

1st

2nd

2nd

 

1st

From –0.2 to –2.0

2nd

1st

1st

 

—

Normal Control mode occurs when ACTIVE DELTA T >

SURGE/HGBP DELTA T.

Surge Prevention Mode occurs when ACTIVE DELTA T

≤SURGE/HGBP DELTA T.

The TARGET VFD SPEED, ACTUAL VFD SPEED and the VFD GAIN can be viewed and modified in the CAPACITY

display screen. The TARGET VFD SPEED can be manually overridden by the operator from the COMPRESS screen. The

VFD MINIMUM SPEED, MAXIMUM SPEED, VFD GAIN and INCREASE STEP can be viewed and modified in the SETUP2 display screen. TARGET and ACTUAL VFD SPEED can be viewed in the COMPRESS screen.

ECW CONTROL OPTION — If this option is enabled, the PIC II uses the ENTERING CHILLED WATER temperature to modulate the vanes instead of the LEAVING CHILLED WATER temperature. The ECW CONTROL OPTION may be viewed on the TEMP_CTL screen, which is accessed from the EQUIPMENT SERVICE screen.

CONTROL POINT DEADBAND — This is the tolerance range on the chilled water/brine temperature control point. If the water temperature goes outside the CHILLED WATER DEADBAND, the PIC II opens or closes the guide vanes until the temperature is within tolerance. The PIC II may be config- ured with a 0.5 to 2 F (0.3 to 1.1 C) deadband. CHILLED WATER DEADBAND may be viewed or modified on the SETUP1 screen, which is accessed from the EQUIPMENT SERVICE table.

For example, a 1° F (0.6° C) deadband setting controls the water temperature within ±0.5° F (0.3° C) of the control point. This may cause frequent guide vane movement if the chilled water load fluctuates frequently. A value of 1° F (0.6° C) is the default setting.

DIFFUSER CONTROL — On 19XR FRAME sizes 4 and 5 compressors equipped with a variable discharge diffuser, the PIC II adjusts the diffuser actuator position (DIFFUSER ACTUATOR on the COMPRESS screen) to correspond to the actual guide vane position (ACTUAL GUIDE VANE POS on the COMPRESS screen).

The diffuser control can be enabled or disabled from the SETUP2 screen. See Table 2, Example 19. In addition, the dif- fuser and guide vane load points may be viewed and modified from this screen. These points must be correct for the compres- sor size. The diffuser opening can be incremented from fully open to completely closed. A 0% setting is fully open; a 100% setting is completely closed. To obtain the proper settings for Diffuser Control, contact a Carrier Engineering representative.

PROPORTIONAL BANDS AND GAIN — Proportional band is the rate at which the guide vane position is corrected in pro- portion to how far the chilled water/brine temperature is from the control point. Proportional gain determines how quickly the guide vanes react to how quickly the temperature is moving from the CONTROL POINT. The proportional bands and gain may be viewed or modified from the SETUP2 screen, which is accessed from the EQUIPMENT SERVICE table.

The Proportional Band — There are two response modes, one for temperature response above the control point, the other for the response below the control point.

The temperature response above the control point is called the PROPORTIONAL INC BAND, and it can slow or quicken guide vane response to chilled water/brine temperatures above the DEADBAND. The PROPORTIONAL INC BAND can be adjusted from a setting of 2 to 10; the default setting is 6.5.

The response below the control point is called the PRO- PORTIONAL DEC BAND, and it can slow or quicken the guide vane response to chilled water temperature below the deadband plus the control point. The PROPORTIONAL DEC BAND can be adjusted on the CVC/ICVC from a setting of 2 to 10. The default setting is 6.0.

NOTE: Increasing either of these settings causes the guide vanes to respond more slowly than they would at a lower setting.

33

Page 32 Page 34
Image 33
Page 32 Page 34
Contents Safety Considerations Start-Up, Operation, and Maintenance InstructionsContents Contents Abbreviations and Explanations Introduction19XR Identification Chiller FamiliarizationTypical 19XR Components Motor and Lubricating OIL Cooling Cycle Refrigeration CycleLubrication Cycle VFD Cooling CycleUnit-Mounted Solid-State Starter Optional Starting EquipmentUnit-Mounted Wye-Delta Starter Optional ControlsDefinitions Variable Frequency Drive VFD 19XR Controls and Sensor Locations PIC II Component Panel Location Major PIC II Components Panel LocationsControl Panel CVC/ICVC Operation and Menus Fig Example of Status Screen 19XR Chiller Display Menu Structure CVC/ICVC 19XR Service Menu Structure Time and Date Example of Time Schedule Operation Screen Example of Set Point Screen CVC/ICVC Display Data Example 1 Chiller Display Default ScreenDescription Status Units Point Example 2 Maintstat Display ScreenExample 3 Startup Display Screen Startup Description Status Units PointExample 5 Heatex Display Screen Example 4 Compress Display ScreenExample 7 Ismstat Display Screen Example 6 Power Display ScreenExample 8 CVC/ICVCPSWD Display Screen Menu Setpoint Select Description Status Units Point DefaultCVC Icvc Description Status Units Point Example 9 Setpoint Display ScreenExample 11 Override Display Screen Control Algorithm Status Override Description Units PointExample 12 Llmaint Display Screen Example 13 Ismhist Display Screen Example 14 Wsmdefme Display ScreenControl Algorithm Status Wsmdefme Description Units Point Ismconf Description Status Units Point Default ISM Starter Config DataExample 15 Netopt Display Screen Example 16 Ismconf Display ScreenExample 18 SETUP1 Display Screen Spare ALERT/ALARM EnableExample 17 Options Display Screen Example 19 SETUP2 Display Screen Example 20 Leadlag Display ScreenLAG=2, STANDBY=3 Reset Type Description Status Units Point DefaultExample 21 Rampdem Display Screen Example 22 Tempctl Display ScreenSurge Prevention Mode occurs when Active Delta T Normal Control mode occurs when Active Delta TMode IGV VFD PIC II System FunctionsPage Protective Safety Limits and Control Settings Page Capacity Overrides Evaporator Freeze Protection Icvc only a Page Head Pressure Reference Output Surge Protection Fixed Speed ChillerPage Page Point Example of Attach to Network Device Screen Example of Holiday Period Screen START-UP/SHUTDOWN Default CVC/ICVC screen, press the MenuRecycle Sequence Fig Local Start-Up Local start-up or a manual start-up isEntering Condenser Water temperature plus 3 F -1.6C Before Initial START-UP Job Data RequiredEquipment Required 19XR Leak Test Procedures Page Page HFC-134a Pressure Temperature F HFC-134a Pressure Temperature CTemperature Pressure Perform dehydration as follows Inspect WiringCheck Starter Manufacturer Cable noWhite G Software Configuration Parameter Benshaw RediStart Micro Menu Items Verify VFD Configuration and Change Parameters if Necessary VFD Title Setting Parameter Description SettingDescription Settings Press Menu Press Status Press Compress Press Select Press Status Press Compress Press SelectLoad Surge Prevention Occurs TOO Soon Occurs TOO Late Estimated Minimum Load ConditionsCCM Temperature Thermistors Charge Refrigerant into Chiller Control Test Menu FunctionsTests to be Devices Tested Performed Refrigerant HFC-134a Charge Initial START-UPDry Run to Test Start-Up Sequence Check Motor RotationCheck Oil Pressure and Compressor Stop Operator Duties Operating InstructionsTo Start the Chiller To Stop the ChillerOperating the Optional Pumpout Unit Pumpout and Refrigerant Transfer ProceduresTime Date Cooler Condenser CompressorBearing FLAValve Condition Turn off pumpout condenser waterChillers with Isolation Valves Test After Service, Repair, or Major Leak If General MaintenanceGuide Vane Actuator Linkage Weekly MaintenanceCheck Safety and Operating Controls Monthly Scheduled MaintenanceInspect the Heat Exchanger Tubes and Flow Devices Compressor Bearing and Gear MaintenanceOptional Pumpout System Controls Ordering Replacement Chiller Parts WhenChecking Pressure Transducers Troubleshooting GuideHeatex LlmaintOccdefcm Shutdown in Progress Terminate Pumpdown ModeICE Build Ready to StartAlert PrestartAutorestart in Progress Running Temp ControlRUN Capacity FaultLimited SensorFailure to ProtectiveStart StopCommunication LossPotential FREEZE-UPLOW OIL Pressure Sensor AlertAutorestart PendingRecycle Pressure AlertOption Sensor DiffuserDrop Thermistor Temperature F vs. Resistance/Voltage DropTemperature PIC Resistance Thermistor Temperature C vs. Resistance/Voltage DropControl Modules Power is connected to Plug J1 on each moduleChiller Control Module CCM Fig Integrated Starter Module FigReplacing Defective Processor Modules Integratedstartermodule Checked Measure SCR Pairs Recorded Being BetweenNumber of Tubes English Code Heat Exchanger Data EnglishNumber of Tubes Code Heat Exchanger Data SI19XR Additional Data for Marine Waterboxes Compressor WeightsEnglish Motor 19XR Motor Weights Standard and High Efficiency Motors19XR Waterbox Cover Weights English lb 19XR Waterbox Cover Weights SI kg Additional Miscellaneous Weights Optional Pumpout System Electrical DataMotor Voltage Code Description Torque Compressor Assembly TorquesCompressor Code View B High Speed Shaft 19XR Compressor ClearancesAllen-Bradley Wye-Delta Unit-Mounted Starter 100101 ISM 102Temp 103104 105 106 107 Power Panel Wiring Schematic108 Cutler-Hammer Wye Delta Unit Mounted Starter Sizes 3-5DP109 Cutler-Hammer Wye Delta Unit Mounted Starter Size 6DPSeparate Metering Option Ground Fault Phase Current Option111 AUX 112FU Fuse 113114 VFD 115116 Typical Variable Frequency Drive VFD Wiring Schematic117 118 119 120 121 122 Index Index JOB Data Required Remove and use for job fileCL-2 Inspect Wiring and Record Electrical Data Ratings10 to 40 to 10060.0 15 toCL-4 460 200 to105 to 115 85 to50 to 30 to20 to Psi CL-690 to 150 to125 125 to65 to 90 to 100Amp 250 CL-8 CL-9 25 toCL-10 50 to 1450200 0000 to0000 to 0200 CL-11004 To H.022 Job Sheet 60 for 60 Hz and 50 for 50 Hz 002 Power Module Dependent Selected motor 100% amps028 10 to Job Sheet 60 for 60 Hz and 50 for 50 Hz 000 100 to Selected line voltageCL-13 CL-14 CCN Local ResetPage Incurring obligations
Related manuals
Manual 40 pages 46.08 Kb

19XR, XRV specifications

The Carrier 19XR and 19XRV chillers are sophisticated cooling solutions that represent the forefront of HVAC technology. Designed for large commercial and industrial applications, these chillers provide exceptional performance, energy efficiency, and reliability, making them ideal for a variety of environments ranging from hospitals to manufacturing facilities.

One of the most significant features of the Carrier 19XR and 19XRV chillers is their advanced scroll compressor technology. These units employ a tandem scroll design that enhances efficiency while minimizing operational noise. This makes them ideal for urban environments where noise restrictions may be in place. Moreover, the compressors are equipped with variable speed drive options in the 19XRV model, which allows for greater energy savings by adjusting cooling output based on real-time demand.

In addition to their advanced compressors, the 19XR and 19XRV units incorporate the Carrier GreenChoice refrigerant, which has a lower global warming potential compared to traditional refrigerants. This innovative choice not only meets regulatory requirements but also contributes to sustainability goals, making these chillers a responsible choice for environmentally conscious organizations.

The units are engineered with a robust heat exchanger design, which enhances heat transfer efficiency and overall system performance. This ensures optimal operation even in extreme conditions. They feature a microprocessor-based control system that allows for precise monitoring and control of the chiller’s performance, enabling operators to make real-time adjustments to maximize energy efficiency.

The Carrier 19XR and 19XRV chillers also prioritize serviceability. The design incorporates easy access to key components, simplifying maintenance procedures and reducing downtime. This focus on maintainability extends the lifespan of the equipment, leading to lower lifecycle costs.

In terms of connectivity, these chillers are equipped with advanced Building Management System (BMS) integration capabilities. This allows for seamless monitoring and control of the chillers using a centralized platform, facilitating energy management and operational optimization.

Overall, the Carrier 19XR and 19XRV chillers stand out in the market for their blend of cutting-edge technology, energy efficiency, and user-friendly features. They are engineered to meet the demanding needs of modern commercial and industrial applications, making them a preferred choice for facility managers seeking reliable cooling solutions.
Top Page Image Contents