Carrier 19XL Other PROBLEMS/MALFUNCTIONS, DESCRIPTION/MALFUNCTION Probable CAUSE/REMEDY

Page 75

Table 9 Ð LID Primary and Secondary Messages and Custom Alarm/Alert Messages

with Troubleshooting Guides (cont)

N. OTHER PROBLEMS/MALFUNCTIONS

DESCRIPTION/MALFUNCTION

PROBABLE CAUSE/REMEDY

 

Chilled water set point set too high. Access set point on LID and verify.

 

Capacity override or excessive cooling load (chiller at design capacity).

 

Check LID status messages. Check for outside air in®ltration into

 

conditioned space.

 

Condenser temperature too high. Check for proper ¯ow, examine cooling

 

tower operation, check for air or water leaks, check for fouled tubes.

Chilled Water/Brine Temperature

Refrigerant level low. Check for leaks, add refrigerant, and trim charge.

Liquid bypass in waterbox. Examine division plates and gaskets for

Too High (Machine Running)

leaks.

 

 

Guide vanes fail to open. Use Control Test to check operation.

 

Chilled water control point too high. Access control algorithm status

 

and check chilled water control operation.

 

Guide vanes fail to open fully. Be sure that the guide vane target is

 

released. Check guide vane linkage. Check limit switch in actuator.

 

Check that sensor is in the proper terminals.

 

Chilled water set point set too low. Access set point on LID and verify.

 

Chilled water control point too low. Access control algorithm status and

Chilled Water/Brine Temperature Too Low

check chilled water control for proper resets.

High discharge temperature keeps guide vanes open.

(Machine Running)

Guide vanes fail to close. Be sure that guide vane target is released.

 

 

Check chilled water sensor accuracy. Check guide vane linkage. Check

 

actuator operation.

 

Deadband too narrow. Con®gure LID for a larger deadband.

 

Proportional bands too narrow. Either INC or DEC proportional bands

Chilled Water Temperature Fluctuates.

should be increased.

Vanes Hunt

Loose guide vane drive. Adjust chain drive.

 

Defective vane actuator. Check through Control Test.

 

Defective temperature sensor. Check sensor accuracy.

Low Oil Sump Temperature While Running

Check for proper oil level (not enough oil). Check for proper refrigerant

(Less than 100 F [38 C])

level (too much refrigerant).

At Power Up, Default Screen Does Not Appear,

Check for proper communications wiring on PSIO module. Check that

the COMM1 communications wires from the LID are terminated to the

``Tables Loading'' Message Continually Appears

COMM1 PSIO connection.

 

SMM Communications Failure

Check that PSIO communication plugs are connected correctly. Check

SMM communication plug. Check for proper SMM power supply. See

 

Control Modules section on page 78.

High Oil Temperature While Running

Check for proper oil level (too much oil). Check that TXV valve is

operating properly.

 

Blank LID Screen

Increase contrast potentiometer. See Fig. 40. Check red LED on LID for

proper operation, (power supply). If LED is blinking, but green LED's are

 

not, replace LID module, (memory failure)

``Communications Failure'' Highlighted Message

LID is not properly addressed to the PSIO. Make sure that ``Attach to

Network Device,'' ``Local Device'' is set to read the PSIO address. Check

At Bottom of LID Screen

LED's on PSIO. Is red LED operating properly? Are green LED's

 

blinking? See control module troubleshooting section.

 

Press the ``Stop'' pushbutton. The PIC must be in the OFF mode for the

Controls Test Disabled

controls test to operate. Clear all alarms. Check line voltage percent on

Status01 screen. The percent must be within 90% to 110%. Check

 

voltage input to SMM, calibrate starter voltage potentiometer for

 

accuracy.

Vanes Will Not Open In Control Test

Low pressure alarm is active. Put chiller into pumpdown mode or

equalize pressure. Check guide vane actuator wiring.

 

Oil Pump Does Not Run

Check oil pump voltage supply. Cooler vessel pressure under vacuum.

Pressurize vessel. Check temperature overload cutout switch.

 

NOTE: See Legend on page 68.

 

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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 Pressure Schrader Fitting Take-Apart Rabbet Fit ConnectorCooler In/Out Temperature Sensors Condenser In/Out Temperature SensorsRefrigerant Motor Cooling and Oil Cooling Cycles Lubrication CycleLubrication System Unit-Mounted Solid-State Starter Optional Starting EquipmentPIC Component Panel DenitionsControls Major PIC Components Panel LocationsPressure 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 SetpointMenu Status Select Description Range Units Reference Point Name Alarm HistoryLID Screens Example 1 Ð STATUS01 Display ScreenMenu Example 2 Ð STATUS02 Display ScreenExample 3 Ð STATUS03 Display Screen Example 4 Ð Setpoint Display ScreenICE Build Termination Example 5 Ð Configuration Config Display ScreenExample 6 Ð LEAD/LAG Configuration Display Screen ECW Control OptionExample 7 Ð SERVICE1 Display Screen Menu Service Example 8 Ð SERVICE2 Display ScreenSpare Alert Enable Example 9 Ð SERVICE3 Display ScreenBearing Temperature Example 10 Ð Maintenance MAINT01 Display ScreenExample 11 Ð Maintenance MAINT02 Display Screen Discharge 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 Hot Gas Bypass Lead/Lag ControlECW HgbpPage Cent Capacity Ice Build ControlPage To LOG on Example of Attach to Network Device ScreenSequence Fig START-UP/SHUTDOWN/RECYCLERecycle Restart Delta T Equipment Required Using the Optional Storage Tank and PumpoutBefore Initial START-UP Job Data 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 MotorsTests to be Devices Tested Performed Charge Refrigerant into Chiller19XL Chiller Equalization Without PUMP- OUT Unit Control Test Menu FunctionsSize Refrigerant Charges19XL Total Refrigerant Charge CoolerInitial START-UP Dry Run to Test Start-Up SequenceCheck Rotation Operator Duties Check Oil Pressure and Compressor StopCalibrate Motor Current Operating InstructionsTo Stop the Chiller Plant Tstat Pumpout and Refrigerant Transfer ProceduresOperating the Optional Pumpout Compressor Transfer Refrigerant from Storage Tank to ChillerTransfer 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 MAINT04 MAINT01MAINT02 MAINT03Timing 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 SCR Benshaw, Inc. Solid-State Starter Troubleshooting GuideProblem Probable Causes Area of Correction RV1Condenser Heat Exchanger DataAdditional Data for Marine Waterboxes Cooler1034 kPa Waterbox Cover WeightsCoolers CondensersCompressor/Motor Weights Compressor WeightsOptional Pumpout System Electrical Data Compressor Fits and Clearances ``Z Compressor Assembly TorquesDescription Torque Ft-lbEXT CLRCOM CommPage CLR Page Chiller Power Panel, Starter Assembly Motor Wiring Schematic Chiller Power Panel, Starter Assembly Motor Wiring Schematic HPS PMRPOT GFRTypical 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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