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

Also see for AquaEdge 19XR series: Installation instructions Start-up, operation and maintenance instructions

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Carrier AquaEdge 19XR series Start-up, Operation And Maintenance Instructions Manual Manual pdf 66 page image

66Table 9 — Prestart ChecksShutdown Sequence — Chiller shutdown begins ifany of the following occurs:• the STOP button is pressed continuously for at least onesecond (the alarm light blinks once to confirm the stopcommand)• a recycle condition is present (see Chilled Water RecycleMode section)• the time schedule has gone into unoccupied mode• the chiller protective limit has been reached and chiller isin alarm• the start/stop status is overridden to stop from the CCNnetwork or the ICVCWhen a stop signal occurs, the shutdown sequence firststops the compressor by deactivating the start relay (1CR). Astatus message of “SHUTDOWN IN PROGRESS, COM-PRESSOR DEENERGIZED” is displayed, and the compres-sor ontime and service ontime stop. The guide vanes are thenbrought to the closed position. The oil pump relay and thechilled water/brine pump relay shut down 60 seconds after thecompressor stops. The condenser water pump shuts down atthe same time if the ENTERING CONDENSER WATER tem-perature is greater than or equal to 115 F (46.1 C) and theCONDENSER REFRIG TEMP is greater than the CONDENS-ER FREEZE POINT plus 5 F (–15.0 C). The stop-to-start timernow begins to count down. If the start-to-start timer value isstill greater than the value of the start-to-stop timer, then thistime displays on the ICVC.Certain conditions that occur during shutdown can changethis sequence.• If the AVERAGE LINE CURRENT is greater than 5%after shutdown, or the starter contacts remain energized,the oil pump and chilled water pump remain energized,the SHUNT TRIP relay is energized, and the alarm isdisplayed.• The condenser pump shuts down when the CON-DENSER PRESSURE is less than the COND PRESSOVERRIDE threshold minus 3.5 psi (24.1 kPa) and theCONDENSER REFRIG TEMP is less than or equal to theENTERING CONDENSER WATER temperature plus3 F (–1.6 C).• If the chiller shuts down due to low refrigerant tempera-ture, the chilled water pump continues to run until theLEAVING CHILLED WATER temperature is greater thanthe CONTROL POINT temperature, plus 5 F (3 C).Automatic Soft Stop Amps Threshold — Thesoft stop amps threshold feature closes the guide vanes of thecompressor automatically if a non-recycle, non-alarm stop sig-nal occurs before the compressor motor is deenergized.Any time the compressor is directed to STOP (except in thecases of a fault or recycle shutdown), the guide vanes aredirected to close, and the compressor shuts off when any of thefollowing is true:• AVERAGE LINE CURRENT (%) drops below the SOFTSTOP AMPS THRESHOLD• ACTUAL GUIDE VANE POSITION drops below 4%• 4 minutes have elapsed• the STOP button is pressed twiceIf the chiller enters an alarm state or if the compressor entersa RECYCLE mode, the compressor deenergizes immediately.To activate the soft stop amps threshold feature, scroll to thebottom of OPTIONS screen on the ICVC. Usethe or softkey to set the SOFTSTOP AMPS THRESHOLD parameter to the percent of ampsat which the motor will shut down. The default setting is 100%amps (no soft stop). The range is 40 to 100%.When the soft stop amps threshold feature is being applied,a status message, “SHUTDOWN IN PROGRESS, COM-PRESSOR UNLOADING” displays on the ICVC.The soft stop amps threshold function can be terminated andthe compressor motor deenergized immediately by depressingthe STOP button twice.Chilled Water Recycle Mode — The chiller maycycle off and wait until the load increases to restart when thecompressor is running in a lightly loaded condition. This cy-cling is normal and is known as “recycle.” A recycle shutdownis initiated when any of the following conditions are true:• LEAVING CHILLED WATER temperature (or ENTERINGCHILLED WATER temperature, if the ECW CONTROLOPTION is enabled) is more than 5° F (2.8° C) below theCONTROL POINT.• LEAVING CHILLED WATER temperature (or ENTERINGCHILLED WATER temperature, if the ECW CONTROLOPTION is enabled) is below the CONTROL POINT, andthe chilled water temperature difference is less than the(RECYCLE CONTROL) SHUTDOWN DELTA T (config-ured in the EQUIPMENT SERVICE/SETUP1 table).• the LEAVING CHILLED WATER temperature is within3 F (1.7 C) of the EVAP REFRIG TRIPPOINT.NOTE: Recycle shutdown will not occur if the CONTROLPOINT has been modified (e.g., by a chilled water reset input)within the previous 5 minutes of operation. Also, chilled waterrecycle logic does not apply to Ice Build operation.When the chiller is in RECYCLE mode, the chilled waterpump relay remains energized so the chilled water temperaturecan be monitored for increasing load. The recycle control usesRESTART DELTA T to check when the compressor should berestarted. This is an operator-configured function which de-faults to 5 F (3 C). This value can be viewed or modified onQUANTITY CHECKED REQUIREMENT ALERT STATE IF FALSESTARTS IN 12 HOURS < 8 (not counting recycle restarts or auto restarts after power failure)ALERT is cleared once RESET is pressed. 100COMP THRUST BRG TEMP < [COMP THRUST BRG ALERT] –10° F (5.6° C) 101COMP MOTOR WINDING TEMP < [COMP MOTOR TEMP OVERRIDE] –10° F (5.6° C) 102COMP DISCHARGE TEMP < [COMP DISCHARGE ALERT] –10° F (5.6° C) 103EVAP REFRIG LIQUID TEMP < [EVAP REFRIG TRIPPOINT] + [REFRIG OVERRIDE DELTA T] 104OIL SUMP TEMP < 150° F (65.5° C) or <[EVAPORATOR REFRIG TEMP] + 50° F (27.8°C) 105CONDENSER PRESSURE < [COND PRESS OVERRIDE] –20 PSI (138 kPa) and< 145 psi (1000 kPa) 106PERCENT LINE VOLTAGE < [Undervoltage Threshold] 107PERCENT LINE VOLTAGE > [Overvoltage Threshold] 108ACTUAL GUIDE VANE POS Controls test guide vane calibration must be performed 109INCREASE DECREASE