Carrier 19XL specifications

Page 33

Tower Fan Relay Ð Low condenser water tempera- ture can cause the chiller to shut down on low refrigerant temperature. The tower fan relay, located in the starter, is controlled by the PIC to energize and deenergize as the pres- sure differential between cooler and condenser vessels changes in order to prevent low condenser water temperature and to maximize chiller efficiency. The tower fan relay can only accomplish this if the relay has been added to the cooling tower temperature controller. The TOWER FAN RELAY is turned on whenever the CONDENSER WATER PUMP is running, ¯ow is veri®ed, and the difference between cooler and condenser pressure is more than 45 psid (310 kPad) [30 psid (207 kPad)] or entering condenser water temper- ature is greater than 85 F (29 C). The TOWER FAN RELAY is deenergized when the condenser pump is off, ¯ow is lost, the evaporator refrigerant temperature is less than the over- ride temperature, or the differential pressure is less than 40 psid (279 kPad) [28 psid (193 kPad)] and entering con- densing water is less than 80 F (27 C).

IMPORTANT: A ®eld-supplied water temperature con- trol system for condenser water should be installed. The system should maintain the leaving condenser wa- ter temperature at a temperature that is 20° F (11° C) above the leaving chilled water temperature.

The tower-fan relay control is not a substitute for a con- denser water temperature control. When used with a Water Temperature Control system, the tower fan relay control can be used to help prevent low condenser wa- ter temperatures.

Auto. Restart After Power Failure Ð This option may be enabled or disabled, and may be viewed/modi®ed in the Con®g table of Equipment Con®guration. If enabled, the chiller will start up automatically after a single cycle drop- out, low, high, or loss of voltage has occurred, and the power is within ±10% of normal. The 15- and 3-minute inhibit tim- ers are ignored during this type of start-up.

When power is restored after the power failure, and if the compressor had been running, the oil pump will be ener- gized for one minute prior to the evaporator pump ener- gizing. Auto restart will then continue like a normal start-up.

If power to the PSIO module has been off for more than

3 hours, the oil heat algorithm, discussed in the Oil Sump Temperature Control section on page 32, will take effect be- fore the compressor can start. Refrigerant normally migrates into the oil when the oil heater is left off for extended pe- riods of time. The PIC operates the oil pump for 1 to 2 min- utes to ensure that the oil is free of excess refrigerant. Once this algorithm is completed, the RESTART of the chiller will continue.

Water/Brine Reset Ð Three types of chilled water or brine reset are available and can be viewed or modi®ed on the Equipment Con®guration table Con®g selection.

The LID default screen status message indicates when the chilled water reset is active. The Control Point tempera- ture on the Status01 table indicates the chiller's current reset temperature.

To activate a reset type, input all con®guration informa- tion for that reset type in the Con®g table. Then input the reset type number in the SELECT/ENABLE RESET TYPE input line.

RESET TYPE 1ÐReset Type 1 requires an optional 8-input module. It is an automatic chilled water temperature reset based on a 4 to 20 mA input signal. This type permits up to

±30° F (± 16° C) of automatic reset to the chilled water or brine temperature set point, based on the input from a 4 to 20 mA signal. This signal is hardwired into the number one 8-input module.

If the 4-20 mA signal is externally powered from the 8-input module, the signal is wired to terminals J1-5(+) and J1-6(±). If the signal is to be internally powered by the 8-input mod- ule (for example, when using variable resistance), the signal is wired to J1-7(+) and J1-6(±). The PIC must now be con- ®gured on the Service2 table to ensure that the appropriate power source is identi®ed.

RESET TYPE 2ÐReset Type requires an optional 8-input module. It is an automatic chilled water temperature reset based on a remote temperature sensor input. This reset type permits ± 30° F (± 16° C) of automatic reset to the set point based on a temperature sensor wired to the number one 8-input module (see wiring diagrams or certi®ed drawings). The tem- perature sensor must be wired to terminal J1-19 and J1-20. To con®gure Reset Type 2, enter the temperature of the remote sensor at the point where no temperature reset will occur. Next, enter the temperature at which the full amount of reset will occur. Then, enter the maximum amount of re- set required to operate the chiller. Reset Type 2 can now be activated.

RESET TYPE 3ÐReset Type 3 is an automatic chilled water temperature reset based on cooler temperature differ- ence. This type of reset will add ± 30° F (± 16° C) based on the temperature difference between entering and leaving chilled water temperature. This is the only type of reset available without the need of the number one 8-input module. No wir- ing is required for this type as it already uses the cooler water sensors. To con®gure Reset Type 3, enter the chilled water temperature difference (the difference between enter- ing and leaving chilled water) at which no temperature reset occurs. This chilled water temperature difference is usually the full design load temperature difference. The difference in chilled water temperature at which the full amount of reset will occur is now entered on the next input line. Next, the amount of reset is entered. Reset Type 3 can now be activated.

Demand Limit Control, Option Ð (Requires Optional 8-Input Module) Ð The demand limit may be externally controlled with a 4 to 20 mA signal from an energy management system (EMS). The option is set up on the Con®g table. When enabled, the control is set for 100% demand with 4 mA and an operator con®gured minimum de- mand set point at 20 mA.

The Demand Reset input from an energy management system is hardwired into the number one, 8-input module. The signal may be internally powered by the module or externally powered. If the signal is externally powered, the signal is wired to terminals J1-1 (+) and J1-2 (±). If the sig- nal is internally powered, the signal is wired to terminals J1-3 (+) and J1-2 (±). When enabled, the control is set for 100% demand with 4 mA and an operator con®gured mini- mum demand set point at 20 mA.

Surge Prevention Algorithm Ð This is an operator con®gurable feature which can determine if lift conditions are too high for the compressor and then take corrective action. Lift is de®ned as the difference between the pressure at the impeller eye and the impeller discharge. The maxi- mum lift that a particular impeller can perform varies with the gas ¯ow across the impeller and the size of the impeller.

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Contents Safety Considerations Start-Up, Operation, and Maintenance InstructionsContents Contents Abbreviations and Explanations IntroductionChiller Familiarization Refrigeration CycleMOTOR/OIL Refrigeration Cooling Cycle 19XL Rear View Cooler In/Out Temperature Sensors Take-Apart Rabbet Fit ConnectorCondenser In/Out Temperature Sensors Cooler Pressure Schrader FittingRefrigerant Motor Cooling and Oil Cooling Cycles Lubrication CycleLubrication System Unit-Mounted Solid-State Starter Optional Starting EquipmentControls DenitionsMajor PIC Components Panel Locations PIC Component PanelPressure Transducer, Typical 19XL Controls and Sensor LocationsControl and OIL Heater Voltage Selector S1 Power Panel with OptionsLID Operation and Menus Fig GeneralSelect Override Operations − Example of Point Status Screen Status01Example of Time Schedule Operation Screen 19XL Menu Structure 19XL Service Menu Structure 19XL Service Menu Structure Example of Set Point Screen SetpointLID Screens Description Range Units Reference Point Name Alarm HistoryExample 1 Ð STATUS01 Display Screen Menu Status SelectExample 3 Ð STATUS03 Display Screen Example 2 Ð STATUS02 Display ScreenExample 4 Ð Setpoint Display Screen MenuExample 6 Ð LEAD/LAG Configuration Display Screen Example 5 Ð Configuration Config Display ScreenECW Control Option ICE Build TerminationExample 7 Ð SERVICE1 Display Screen Spare Alert Enable Example 8 Ð SERVICE2 Display ScreenExample 9 Ð SERVICE3 Display Screen Menu ServiceExample 11 Ð Maintenance MAINT02 Display Screen Example 10 Ð Maintenance MAINT01 Display ScreenDischarge Temperature Bearing TemperatureExample 12 Ð Maintenance MAINT03 Display Screen Example 13 Ð Maintenance MAINT04 Display ScreenDescription RANGE/STATUS Units Reference Point Name PIC System Functions Page Protective Safety Limits and Control Settings Capacity Overrides Page Page ECW Lead/Lag ControlHgbp Hot Gas BypassPage Cent Capacity Ice Build ControlPage To LOG on Example of Attach to Network Device ScreenSequence Fig START-UP/SHUTDOWN/RECYCLERecycle Restart Delta T Before Initial START-UP Using the Optional Storage Tank and PumpoutJob Data Required Equipment Required19XL Leak Test Procedures Page Ð HCFC-22 Pressure Ð Temperature C Ð HCFC-22 Pressure Ð Temperature FÐ HFC-134a Pressure Ð Temperature F Ð HFC-134a Pressure Ð Temperature CTemperature Pressure Page Check Optional Pumpout Compressor Water Pip Inspect WiringMECHANICAL-TYPE Starters Check StarterBENSHAW, INC. SOLID-STATE Starter Benshaw, Inc. Solid-State Starter Power StackSet Up Chiller Control Conguration Power Up the Controls and Check the Oil HeaterLoad Surge Prevention Occurs TOO Soon Occurs TOO Late Volt Motor Code Amps Correction Factors For 19XL Motors19XL Chiller Equalization Without PUMP- OUT Unit Charge Refrigerant into ChillerControl Test Menu Functions Tests to be Devices Tested Performed19XL Total Refrigerant Charge Refrigerant ChargesCooler SizeInitial START-UP Dry Run to Test Start-Up SequenceCheck Rotation Calibrate Motor Current Check Oil Pressure and Compressor StopOperating Instructions Operator DutiesTo Stop the Chiller Plant Operating the Optional Pumpout Compressor Pumpout and Refrigerant Transfer ProceduresTransfer Refrigerant from Storage Tank to Chiller TstatTransfer the Refrigerant from Chiller to Storage Tank Chillers with Isolation ValvesGeneral Maintenance Test After Service, Repair, or Major Leak Ð IfReturn Refrigerant to Normal Operating Conditions Guide Vane Actuator Linkage Weekly MaintenanceScheduled Maintenance Check Safety and Operating Controls MonthlyTo Change the OIL Inspect the Heat Exchanger Tubes Compressor Bearing and Gear MaintenOptional Pumpout System Controls Troubleshooting Guide MAINT02 MAINT01MAINT03 MAINT04Timing OUT or Timed OUT Shutdown with ON/OFF/RESET-OFFRecycle Shutdown Normal or AUTO.-RESTARTAutorestart in Progress LOW Chilled Water Compressor Jumpstart and Refrigerant Protection Normal RUN with RESET, TEMPERATURE, or DemandNormal RUN Overrides Active Alerts OUT-OF-RANGE Sensor FailuresLimited Protective Limit Chiller Protect Limit FaultsSpare Sensor Alert Messages Chiller AlertsDESCRIPTION/MALFUNCTION Probable CAUSE/REMEDY Other PROBLEMS/MALFUNCTIONSTemperature Voltage Resistance Drop Ð Thermistor Temperature F vs Resistance/Voltage DropÐ Thermistor Temperature C vs Resistance/Voltage Drop Control Modules Module AddressInput Options Module Starter Management Module SMM Fig Processor Module Psio FigOptions Module Switch Options Setting Module InstallationTypical Benshaw, Inc. Solid-State Starter internal View Page Page Problem Probable Causes Area of Correction Benshaw, Inc. Solid-State Starter Troubleshooting GuideRV1 SCRAdditional Data for Marine Waterboxes Heat Exchanger DataCooler CondenserCoolers Waterbox Cover WeightsCondensers 1034 kPaCompressor/Motor Weights Compressor WeightsOptional Pumpout System Electrical Data Compressor Fits and Clearances Description Torque Compressor Assembly TorquesFt-lb ``ZCOM CLRComm EXTPage CLR Page Chiller Power Panel, Starter Assembly Motor Wiring Schematic Chiller Power Panel, Starter Assembly Motor Wiring Schematic POT PMRGFR HPSTypical Wye-Delta Unit Mounted Starter Wiring Schematic Index Index Copyright 1996 Carrier Corporation

19XL specifications

The Carrier 19XL is a highly regarded commercial heating and cooling solution, designed to provide optimum performance and energy efficiency in various applications. This rooftop unit is engineered to meet the diverse needs of businesses, making it an ideal choice for those requiring reliable climate control in their facilities.

One of the standout features of the Carrier 19XL is its advanced cooling and heating capabilities. The unit utilizes a high-efficiency scroll compressor that ensures a quieter operation and improved reliability. The system can operate across a wide range of temperatures, making it versatile for various climates. Additionally, it offers both cooling and heating options, allowing for year-round comfort.

Energy efficiency is a focal point of the 19XL design. With an impressive Seasonal Energy Efficiency Ratio (SEER) and Heating Seasonal Performance Factor (HSPF), this unit not only helps reduce energy costs but also supports environmental sustainability initiatives. The unit is equipped with environmentally friendly refrigerants, further contributing to lower greenhouse gas emissions.

The Carrier 19XL features a user-friendly control system, allowing for easy monitoring and management of the unit's performance. This control system is designed to maximize energy savings, offering features such as demand control ventilation and integrated economizers that facilitate the use of outdoor air for cooling, reducing reliance on mechanical systems when conditions allow.

Construction-wise, the Carrier 19XL is built to withstand tough environmental conditions. Its robust cabinet is made from galvanized steel, providing durability and protection against the elements. The design also includes insulation to minimize noise levels, creating a more comfortable indoor environment.

Maintenance is a key consideration in the design of the 19XL. The unit features accessible service ports and a simplified access panel, allowing technicians to perform routine maintenance with ease. This proactive design helps ensure the longevity of the system and minimizes downtime, keeping operations running smoothly.

In summary, the Carrier 19XL is an exceptional choice for commercial heating and cooling needs. With its energy-efficient features, advanced technology, and durable construction, it stands out as a reliable solution for businesses looking for sustainable climate control options.
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