Carrier 19XL specifications To Stop the Chiller

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2.The bearing oil temperature accessed on the Status01 table should be 120 to 165 F (49 to 74 C). If the bearing temperature reads more than 180 F (83 C) with the oil pump running, stop the chiller and determine the cause of the high temperature. Do not restart the chiller until corrected.

3.The oil level should be visible anywhere in one of the two sight glasses. Foaming of the oil is acceptable as long as the oil pressure and temperature are within limits.

4.The oil pressure should be between 18 and 30 psid (124 to 207 kPad), as seen on the LID default screen. Typically the reading will be 18 to 25 psid (124 to 172 kPad) at initial start-up.

5.The moisture indicator sight glass on the refrigerant motor cooling line should indicate refrigerant ¯ow and a dry condition.

6.The condenser pressure and temperature varies with the chiller design conditions. Typically the pressure will range between 100 and 210 psig (690 to 1450 kPa) with a corresponding temperature range of 60 to 105 F (15 to 41 C). The condenser entering water temperature should be controlled below the speci®ed design entering water temperature to save on compressor kilowatt requirements.

7.Cooler pressure and temperature also will vary with the design conditions. Typical pressure range will be be- tween 60 and 80 psig (410 and 550 kPa), with temper- ature ranging between 34 and 45 F (1 and 8 C).

8.The compressor may operate at full capacity for a short time after the pulldown ramping has ended, even though the building load is small. The active electrical demand setting can be overridden to limit the compressor IkW, or the pulldown rate can be decreased to avoid a high demand charge for the short period of high demand operation. Pulldown rate can be based on load rate or temperature rate. It is accessed on the Equipment Con- ®guration, Con®g table (Table 2, Example 5).

To Stop the Chiller

1.The occupancy schedule will start and stop the chiller automatically once the time schedule is set up.

2.By pressing the STOP button for one second, the alarm light will blink once to con®rm that the button has been pressed, then the compressor will follow the normal shut- down sequence as described in the Controls section. The

chiller will not restart until the CCN or LOCAL soft- key is pressed. The chiller is now in the OFF mode.

If the chiller fails to stop, in addition to action that the PIC will initiate, the operator should close the guide vanes by overriding the guide vane target to zero to re- duce chiller load; then by opening the main disconnect. Do not attempt to stop the chiller by opening an isolating knife switch. High intensity arcing may occur. Do not re- start the chiller until the problem is diagnosed and corrected.

After Limited Shutdown Ð No special preparations should be necessary. Follow the regular preliminary checks and starting procedures.

Extended Shutdown Ð The refrigerant should be trans- ferred into the storage vessel (if supplied; see Pumpout and Refrigerant Transfer Procedures) in order to reduce chiller pressure and possibility of leaks. Maintain a holding charge

of 5 to 10 lbs (2.27 to 4.5 kg) of refrigerant to prevent air from leaking into the chiller.

If freezing temperatures are likely to occur in the chiller area, drain the chilled water, condenser water, and the pumpout condenser water circuits to avoid freeze-up. Keep the waterbox drains open.

Leave the oil charge in the chiller with the oil heater and controls energized to maintain the minimum oil reser- voir temperature.

After Extended Shutdown Ð Be sure that the water system drains are closed. It may be advisable to ¯ush the water circuits to remove any soft rust which may have formed. This is a good time to brush the tubes if necessary.

Check the cooler pressure on the LID default screen, and compare to the original holding charge that was left in the chiller. If (after adjusting for ambient temperature changes) any loss in pressure is indicated, check for refrigerant leaks. See Check Chiller Tightness section, page 41.

Recharge the chiller by transferring refrigerant from the storage tank (if supplied). Follow the Pumpout and Refrig- erant Transfer Procedures section, page 59. Observe freeze-up precautions.

Carefully make all regular preliminary and running sys- tem checks. Perform a Control Test before start-up. If the compressor oil level appears abnormally high, the oil may have absorbed refrigerant. Make sure that the oil tempera- ture is above 140 F (60 C) or cooler refrigerant temperature plus 50° F (27° C).

Cold Weather Operation Ð When the entering con- denser water drops very low, the operator should auto- matically cycle the cooling tower fans off to keep the temperature up. Piping may also be arranged to bypass the cooling tower. The PIC controls have a low limit tower fan relay (PR3) that can be used to assist in this control.

Manual Guide Vane Operation Ð Manual opera- tion of the guide vanes in order to check control operation or control of the guide vanes in an emergency operation is possible by overriding the target guide vane position. Access the Status01 table on the LID and highlight TARGET GUIDE VANE POSITION. To control the position, enter a percentage of guide vane opening that is desired. Zero percent is fully closed, 100% is fully open. To re- lease the guide vanes to AUTOMATIC mode, press the

RELEASE softkey.

NOTE: Manual control will increase the guide vanes and override the pulldown rate during start-up. Motor current above the electrical demand setting, capacity overrides, and chilled water below control point will override the manual target and close the guide vanes. For descriptions of capacity over- rides and set points, see the Controls section.

Refrigeration Log Ð A refrigeration log, such as the one shown in Fig. 33, provides a convenient check- list for routine inspection and maintenance and provides a continuous record of chiller performance. It is an aid in scheduling routine maintenance and in diagnosing chiller problems.

Keep a record of the chiller pressures, temperatures, and liquid levels on a sheet similar to that shown. Automatic recording of PIC data is possible through the use of CCN devices such as the Data Collection module and a Building Supervisor. Contact your Carrier representative for more information.

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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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