Carrier 19XR Start-up, Operation And Maintenance Instructions Manual

Also see for HERMETIC CENTRIFUGAL LIQUID CHILLERS 19XR: User manual Start-up and service instructions Installation instructions Product data Installation instructions

Contents

Carrier 19XR Start-up, Operation And Maintenance Instructions Manual Manual pdf 71 page image

These maintenance screens are very useful in helping todetermine how the control temperature is calculated and guidevane positioned and for observing the reactions from loadchanges, control point overrides, hot gas bypass, surge pre-vention, etc. The tables are:CAPACITY CapacityControl This table shows all valuesused to calculate the chilledwater/brine control point.OVERRIDE OverrideStatus Details of all chilled water con-trol override values.HEAT_EX Surge/HGBPStatusThe surge and hot gas bypasscontrol algorithm status isviewed from this screen. Allvalues dealing with this controlare displayed.LL_MAINT LEAD/LAGStatus Indicates LEAD/LAG operationstatus.OCCDEFCM TimeSchedulesStatusThe Local and CCN occupiedschedules are displayed hereto help the operator quickly de-termine whether the scheduleis in the 9occupied9 mode ornot.WSMDEFME WaterSystemManagerStatusThe water system manager is aCCN module that can turn onthe chiller and change thechilled water control point. Thisscreen indicates the status ofthis system.Control Test — The Control Test feature can check allthe thermistor temperature sensors, pressure transducers, pumpsand their associated flow devices, the guide vane actuator,and other control outputs such as hot gas bypass. The testscan help to determine whether a switch is defective or a pumprelay is not operating, as well as other useful troubleshoot-ing issues. During pumpdown operations, the pumps are en-ergized to prevent freeze-up and the vessel pressures andtemperatures are displayed. The Pumpdown/Lockout fea-ture prevents compressor start-up when there is no refrig-erant in the chiller or if the vessels are isolated. The Termi-nate Lockout feature ends the Pumpdown/Lockout after thepumpdown procedure is reversed and refrigerant is added.LEGEND TO TABLES 8A - 8JCCM — Chiller Control ModuleCVC — Chiller Visual ControlCHW — Chilled WaterISM — Integrated Starter ModulePIC II — Product Integrated Control IIVFD — Variable Frequency DriveTable 8 — CVC Primary and Secondary Messages andCustom Alarm/Alert Messages with Troubleshooting GuidesA. MANUAL STOPPRIMARY MESSAGE SECONDARY MESSAGE PROBABLE CAUSE/REMEDYMANUALLY STOPPED — PRESS CCN OR LOCAL TO START PIC II in OFF mode, press CCN or LOCAL softkey to start unit.TERMINATE PUMPDOWN MODE TO SELECT CCN OR LOCAL Enter the CONTROL TEST table and select TERMINATE LOCKOUT tounlock compressor.SHUTDOWN IN PROGRESS COMPRESSOR UNLOADING Chiller unloading before shutdown due to soft/stop feature.SHUTDOWN IN PROGRESS COMPRESSOR DEENERGIZED Chiller compressor is being commanded to stop. Water pumps aredeenergized within one minute.ICE BUILD OPERATION COMPLETE Chiller shutdown from Ice Build operation.B. READY TO STARTPRIMARY MESSAGE SECONDARY MESSAGE PROBABLE CAUSE/REMEDYREADY TO START IN XX MIN UNOCCUPIED MODE Time schedule for PIC II is unoccupied. Chillers will start only whenoccupied.READY TO START IN XX MIN REMOTE CONTACTS OPEN Remote contacts are open. Close contacts to start.READY TO START IN XX MIN STOP COMMAND IN EFFECT Chiller START/STOP on MAINSTAT manually forced to stop. Releasepoint to start.READY TO START IN XX MIN OCCUPIED MODE Chiller timer counting down. Unit ready to start.READY TO START IN XX MIN REMOTE CONTACTS CLOSED Chiller timer counting down. Unit ready to start. Remote contact enabledand closed.READY TO START IN XX MIN START COMMAND IN EFFECT Chiller START/STOP on MAINSTAT manually forced to start. Releasevalue to start under normal control.READY TO START IN XX MIN RECYCLE RESTART PENDING Chiller in recycle mode.READY TO START UNOCCUPIED MODE Time schedule for PIC II is unoccupied. Chiller will start when occupied.Make sure the time and date are correct. Change values in TIME ANDDATE screen.READY TO START REMOTE CONTACTS OPEN Remote contacts have stopped the chiller. Close contacts to start.READY TO START STOP COMMAND IN EFFECT Chiller START/STOP on MAINSTAT manually forced to stop. Releasepoint to start.READY TO START OCCUPIED MODE Chiller timers complete, unit start will commence.READY TO START REMOTE CONTACTS CLOSED Chiller timer counting down. Unit ready for start.READY TO START START COMMAND IN EFFECT Chiller START/STOP on MAINSTAT has been manually forced to start.Chiller will start regardless of time schedule or remote contact status.STARTUP INHIBITED LOADSHED IN EFFECT CCN loadshed module commanding chiller top stop.71