Carrier Comprehensive Manual for Chiller Demand Limit Settings
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(see wiring diagrams or certified drawings). The temperature sensor must be wired to terminal J4-13 and J4-14. To configure Reset Type 2, enter the temperature of the remote sensor at the point where no temperature reset will occur (REMOTE TEMP –> NO RESET). Next, enter the temperature at which the full amount of reset will occur (REMOTE TEMP –> FULL RESET). Then, enter the maximum amount of reset required to operate the chiller (DEGREES RESET). Reset Type 2 can now be activated.

RESET TYPE 3 — Reset Type 3 is an automatic chilled water temperature reset based on cooler temperature difference. Reset Type 3 adds ± 30° F (± 16° C) based on the temperature difference between the entering and leaving chilled water temperature.

To configure Reset Type 3, enter the chilled water tempera- ture difference (the difference between entering and leaving chilled water) at which no temperature reset occurs (CHW DELTA T –> NO RESET). This chilled water temperature dif- ference is usually the full design load temperature difference. Next, enter the difference in chilled water temperature at which the full amount of reset occurs (CHW DELTA T –> FULL RE- SET). Finally, enter the amount of reset (DEGREES RESET). Reset Type 3 can now be activated.

Demand Limit Control Option — The demand limit control option (20 mA DEMAND LIMIT OPT) is externally controlled by a 4 to 20 mA or 1 to 5 vdc signal from an energy management system (EMS). The option is set up on the RAMP_DEM screen. When enabled, 4 mA is the 100% de- mand set point with an operator-configured minimum demand at a 20 mA set point (DEMAND LIMIT AT 20 mA).

The auto. demand limit is hardwired to terminals J5-1 (–) and J5-2 (+) on the CCM. Switch setting number 1 on SW2 will determine the type of input signal. With the switch set at the ON position the input is configured for an externally pow- ered 4 to 20 mA signal. With the switch in the OFF position the input is configured for an external 1 to 5 vdc signal.

Surge Prevention Algorithm (Fixed Speed Chiller) — This is an operator-configurable feature that can determine if lift conditions are too high for the compressor and then take corrective action. Lift is defined as the difference be- tween the pressure at the impeller eye and at the impeller discharge. The maximum lift a particular impeller wheel can perform varies with the gas flow across the impeller and the size of the wheel.

A surge condition occurs when the lift becomes so high the gas flow across the impeller reverses. This condition can even- tually cause chiller damage. The surge prevention algorithm notifies the operator that chiller operating conditions are mar- ginal and to take action to help prevent chiller damage such as lowering entering condenser water temperature.

The surge prevention algorithm first determines if correc- tive action is necessary. The algorithm checks 2 sets of opera- tor-configured data points, the minimum load points (MIN. LOAD POINT [T1,P1]) and the full load points (FULL LOAD POINT [T2,P2]). These points have default settings as defined on the OPTIONS screen or on Table 4.

The surge prevention algorithm function and settings are graphically displayed in Fig. 21 and 22. The two sets of load points on the graph (default settings are shown) describe a line the algorithm uses to determine the maximum lift of the com- pressor. When the actual differential pressure between the cool- er and condenser and the temperature difference between the entering and leaving chilled water are above the line on the graph (as defined by the minimum and full load points), the al- gorithm goes into a corrective action mode. If the actual values are below the line and outside of the deadband region, the algo- rithm takes no action. When the point defined by the ACTIVE DELTA P and ACTIVE DELTA T, moves from the region

where the HOT GAS BYPASS/SURGE PREVENTION is off, the point must pass through the deadband region to the line determined by the configured values before the HOT GAS BYPASS/SURGE PREVENTION will be turned on. As the point moves from the region where the HOT GAS BYPASS/ SURGE PREVENTION is on, the point must pass through the deadband region before the HOT GAS BYPASS/SURGE PREVENTION is turned off. Information on modifying the de- fault set points of the minimum and full load points may be found in the Input Service Configurations section, page 55.

The state of the surge/hot gas bypass algorithm on the HEAT_EX DISPLAY SCREEN (Surge/HGBP Active?).

Corrective action can be taken by making one of 2 choices. If a hot gas bypass line is present and the hot gas option is selected on the OPTIONS table (SURGE LIMIT/HGBP OPTION is set to 1), the hot gas bypass valve can be energized. If the hot gas bypass option is not selected (SURGE LIMIT/ HGBP OPTION is set to 0), hold the guide vanes. See Table 4,

LEGEND

ECW — Entering Chilled Water

HGBP — Hot Gas Bypass

LCW — Leaving Chilled Water

∆P = (Condenser Psi) – (Cooler Psi) ∆T = (ECW) – (LCW)

Fig. 21 — 19XR Hot Gas Bypass/Surge Prevention with Default English Settings

LEGEND

ECW — Entering Chilled Water

HGBP — Hot Gas Bypass

LCW — Leaving Chilled Water

∆P = (Condenser kPa) – (Cooler kPa) ∆T = (ECW) – (LCW)

Fig. 22 — 19XR Hot Gas Bypass/Surge Prevention with Default Metric Settings

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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 ScreenStartup Description Status Units Point Example 2 Maintstat Display ScreenDescription Status Units Point Example 3 Startup Display ScreenExample 5 Heatex Display Screen Example 4 Compress Display ScreenExample 7 Ismstat Display Screen Example 6 Power Display ScreenExample 9 Setpoint Display Screen Menu Setpoint Select Description Status Units Point DefaultExample 8 CVC/ICVCPSWD Display Screen CVC Icvc Description Status Units PointExample 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 Example 16 Ismconf Display Screen ISM Starter Config DataIsmconf Description Status Units Point Default Example 15 Netopt 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 Example 22 Tempctl Display Screen Description Status Units Point DefaultReset Type Example 21 Rampdem Display ScreenPIC II System Functions Normal Control mode occurs when Active Delta TSurge Prevention Mode occurs when Active Delta T Mode IGV VFDPage 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 Local Start-Up Local start-up or a manual start-up is Default CVC/ICVC screen, press the MenuSTART-UP/SHUTDOWN Recycle Sequence FigEntering 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 To Stop the Chiller Operating InstructionsOperator Duties To Start the ChillerOperating the Optional Pumpout Unit Pumpout and Refrigerant Transfer ProceduresFLA Date Cooler Condenser CompressorTime BearingValve 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 Ready to Start Terminate Pumpdown ModeShutdown in Progress ICE BuildRunning Temp Control PrestartAlert Autorestart in ProgressSensor FaultRUN Capacity LimitedStop ProtectiveFailure to StartFREEZE-UP LossCommunication PotentialPending Sensor AlertLOW OIL Pressure AutorestartDiffuser Pressure AlertRecycle Option SensorDrop 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 Ratings15 to 40 to 10010 to 60.0CL-4 85 to 200 to460 105 to 115CL-6 30 to50 to 20 to Psi125 to 150 to90 to 12565 to 90 to 100Amp 250 CL-8 CL-9 25 toCL-10 50 to 145CL-11 0000 to0200 0000 to 0200000 100 to Selected line voltage 002 Power Module Dependent Selected motor 100% amps004 To H.022 Job Sheet 60 for 60 Hz and 50 for 50 Hz 028 10 to Job Sheet 60 for 60 Hz and 50 for 50 HzCL-13 CL-14 CCN Local ResetPage Incurring obligations
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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.
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