Carrier 17EX specifications Cent Capacity

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LEAD/LAG OPERATION Ð The PIC control has the ca- pability to operate 2 chillers in the lead/lag mode. It also has the additional capability to start a designated standby chiller when either the lead or lag chiller is not operating and capacity requirements are not being met. The lead/lag option operates in CCN mode only. If any other chiller con- ®gured for lead/lag is set to the LOCAL or OFF modes, it will be unavailable for lead/lag operation.

NOTE: Lead/lag con®guration is viewed and edited on the LEAD/LAG screen, accessed from the EQUIPMENT CON- FIGURATION table of the SERVICE menu. See Table 2, Example 7. Lead/lag status during chiller operation is viewed on the MAINT04 screen, accessed from the CONTROL AL- GORITHM STATUS table. See Table 2, Example 14.

Lead/Lag Chiller Con®guration and Operation Ð A chiller is designated the lead chiller when the LEAD/LAG SELECT parameter for that chiller is set to 1 on the LEAD/ LAG CONFIGURATION screen. A chiller is designated the lag chiller when the LEAD/LAD SELECT parameter for that chiller is set to 2. A chiller is designated the standby chiller when the LEAD/LAG SELECT parameter for that chiller is set to 3. Setting the LEAD/LAG SELECT parameter to 0 dis- ables the lead/lag function in that chiller.

To con®gure the LAG ADDRESS parameter on the LEAD/ LAG CONFIGURATION screen, always use the address of the other chiller on the system. Using this address makes it easier to rotate the lead and lag chillers.

If improper address assignments are entered for the LAG ADDRESS and STANDBY ADDRESS parameters, the lead/lag is disabled and an alert (!) message displays on the LID. For example, if the lag chiller's address matches the lead chiller's address, the lead/lag function is disabled and an alert (!) message displays. The lead/lag maintenance screen (MAINT04) displays the message INVALID CONFIG in the LEAD/LAG CONFIGURATION and CURRENT MODE ®elds.

The lead chiller responds to normal start/stop controls such as occupancy schedule, forced start/stop, and remote start contact inputs. After completing start-up and ramp loading, the PIC evaluates the need for additional capacity. If addi- tional capacity is needed, the PIC initiates the start-up of the chiller con®gured at the lag address. If the lag chiller is faulted (in alarm) or is in the OFF or LOCAL modes, then the chiller at the standby address (if con®gured) is requested to start. After the second chiller is started and is running, the lead chiller monitors conditions and evaluates whether the ca- pacity has been reduced enough for the lead chiller to sus- tain the system alone. If the capacity is reduced enough for the lead chiller to sustain the control point temperatures alone, then the operating lag chiller is stopped.

If the lead chiller is stopped in CCN mode for any reason other than an alarm (*) condition, then the lag and standby chillers are stopped. If the con®gured lead chiller stops for an alarm condition, then the con®gured lag chiller takes the lead chiller's place as the lead chiller and the standby chiller serves as the lag chiller.

If the con®gured lead chiller does not complete the start-up before the PRESTART FAULT TIMER (a user con®gured pa- rameter on the LEAD/LAG screen) elapses, then the lag chiller is started and the lead chiller shuts down. The lead chiller then monitors the request to start from the acting lead chiller. The pre-start fault timer is initiated at the time of a start re- quest. This timer's function is to provide a time-out if there is a pre-start alert condition that prevents the chiller from starting in a timely manner.

If the lag chiller does not achieve start-up before the pre-start fault time elapses, then the lag chiller is stopped and the standby chiller is requested to start, if con®gured and ready.

Standby Chiller Con®guration and Operation Ð The con- ®gured standby chiller is identi®ed as such by having its LEAD/ LAG SELECT parameter assigned a value of 3. The standby chiller can only operate as a replacement for the lag chiller if one of the other two chillers is in an alarm (*) condition (as indicated on the LID panel). If both lead and lag chillers are in an alarm (*) condition, the standby chiller defaults to operate in CCN mode based on its con®gured occupancy sched- ule and remote contacts input.

Lag Chiller Start-Up Requirements Ð Before the lag chiller can be started, the following conditions must be met.

1.Lead chiller ramp loading must be completed.

2.Lead chiller's chilled water temperature must be greater than the WATER/BRINE CONTROL POINT (STA- TUS01 screen) plus half the WATER/BRINE DEAD- BAND (SERVICE1 screen).

NOTE: The chilled water temperature sensor may be the leaving chilled water sensor, the return water sensor, the common supply water sensor, or the common return wa- ter sensor, depending on which options are con®gured and enabled.

3.Lead chiller ACTIVE DEMAND LIMIT (STATUS01 screen) value must be greater than 95% of full load amps.

4.Lead chiller temperature pulldown rate (TEMP PULL- DOWN DEG/MIN on the CONFIG screen) of the chilled water temperature is less than 0.5° F (0.27° C) per minute.

5.The lag chiller status indicates it is in CCN mode and is not faulted. If the current lag chiller is in an alarm con- dition, then the standby chiller becomes the active lag chiller, if it is con®gured and available.

6.The con®gured time for the LAG START TIMER param- eter has elapsed. The lag start timer starts when the lead chiller ramp loading is completed. The LAG START TIMER parameter is on the LEAD/LAG screen, which is ac- cessed from the EQUIPMENT CONFIGURATION table. See Table 2, Example 7.

When all the above requirements have been met, the lag chiller is forced to a STARTUP mode. The PIC control then monitors the lag chiller for a successful start. If the lag chiller fails to start, the standby chiller, if con®gured, is started.

Lag Chiller Shutdown Requirements Ð The following con- ditions must be met in order for the lag chiller to be stopped.

1.Lead chiller COMPRESSOR MOTOR LOAD (STA- TUS01 screen) value is less than the lead chiller percent capacity plus 15%. See STATUS01 screen or Table 2, Example 1.

NOTE: Lead chiller percent capacity = 100 ± LAG PER-

CENT CAPACITY.

The LAG PERCENT CAPACITY value is con®gured on the LEAD/LAG CONFIGURATION screen.

2.The lead chiller chilled water temperature is less than the WATER/BRINE CONTROL POINT plus 1/2 of the WATER/BRINE DEADBAND. The WATER/BRINE DEAD- BAND parameter is on the SERVICE1 screen. See Table 2, Example 8.

3.The con®gured lag stop time (LAG STOP TIMER param- eter on the LEAD/LAG CONFIGURATION screen) has elapsed. The lag start time starts when the LEAVING CHILLED WATER temperature is less than the WATER/ BRINE CONTROL POINT plus 1/2 of the WATER/ BRINE DEADBAND, and the lead chiller COMPRESSOR MOTOR LOAD is less than the lead chiller percent ca- pacity plus 15%. The lag stop timer is ignored if the chilled water temperature reaches 3° F (1.67° C) below the WATER/ BRINE CONTROL POINT and the lead chiller COM- PRESSOR MOTOR LOAD value is less than the lead chiller percent capacity plus 15%.

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Contents Safety Considerations Start-Up, Operation, and Maintenance InstructionsContents Inspect Water Piping Piping Check Relief Devices Inspect WiringOCCPC01S Input Service Congurations Coupling Maintenance Motor MaintenanceContents Introduction Abbreviations17EX Chiller Familiarization Certified PerformanceTypical 17EX Chiller Components Lubrication Cycle OIL Cooling CycleRefrigeration, Cycle Starters17EX Compressor Lubrication Cycle Denitions ControlsProcessor Sensor Input/Output Module Control Center Temperature Sensors See Fig Pressure TransducersMajor PIC Components Panel Locations PIC Component Panel Location17EX Controls and Sensor Locations LID PICPsio Equip GND Ð GRDTewac LID Operation and Menus Fig PROCESSOR/SENSOR INPUT/OUTPUT Module PsioGeneral LID Service Screen Override Operations YES or no , on or OFF , etc. to select the desired state17EX LID Menu Structure Default ScreenControl Test Service TableAlarm History Equipment ConfigurationLID CCNCarrier Comfort Network Hgbp Ð Hot Gas BypassHgbp SetpointChwr ChwsMenu Status Select Description Range Units Reference Point Name Alarm HistoryLID Display Data Example 1 Ð STATUS01 Display ScreenExample 2 Ð STATUS02 Display Screen Example 3 Ð STATUS03 Display ScreenMenu Status Example 4 Ð STATUS04 Display Screen Example 5 Ð Setpoint Display ScreenMenu Example 6 Ð Configuration Config Display Screen ECW Control OptionICE Build Termination LAG =2, Standby =3 Example 7 Ð LEAD/LAG Configuration Display ScreenExample 8 Ð SERVICE1 Display Screen Menu Service Example 9 Ð SERVICE2 Display ScreenSpare Alert Enable Example 10 Ð SERVICE3 Display ScreenBearing Temperature Example 11 Ð Maintenance MAINT01 Display ScreenExample 12 Ð Maintenance MAINT02 Display Screen Discharge TemperatureExample 13 Ð Maintenance MAINT03 Display Screen Example 14 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 Cent Capacity ICE Build Setpoint Example of Attach to Network Device Screen Example of Holiday Period Screen To Access the Service ScreensRecycle Sequence Fig START-UP/SHUTDOWNPage Motor Before Initial START-UPJob Data Required Equipment RequiredPage 17EX Leak Test Procedures Temperature C Ð HFC-134a Pressure Ð Temperature FÐ HFC-134a Pressure Ð Temperature C Temperature FDehydration Cold Trap Inspect Wiring Check Optional Pumpout Compressor Water Pip900 500 901 7000 1000 7001-14500 2500 Recommended Motor Fastener Tightening Torques External Gear Pre-Start ChecksExternal Gear Lubrication System Check Starter Mechanical StartersSOLID-STATE Starters Set Up Chiller Control Conguration Input the Design Set Points Ð To modify the setInput the Local Occupied Schedule OCCPC01S Change the LID Configuration if Necessary Surge Limiting orT1/P1 Full Load Points T2/P2 Load Surge Prevention Occurs TOO Soon Occurs TOO Late Increase P1 by Decrease P1 by50% Tests to be Devices Tested Performed Charge Refrigerant into ChillerInitial START-UP Control Test Menu FunctionsDry Run to Test Start-Up Sequence Check Motor RotationInitial Motor START-UP Page Flange Nut Tightening Torques Low Speed Couplings Only General Recommendations Calibrate Motor Current Demand SettingCheck Oil Pressure and Compressor Stop To Prevent Accidental Start-Up Ð The PIC can beStopping the Chiller Operating InstructionsOperator Duties Starting the ChillerOperating the Optional Pumpout Compressor Pumpout and Refrigerant Transfer ProceduresPlant Chiller Serial No Chiller Model No Refrigerant Type Rear View Valve Condition RLAReturn Chiller to Normal Operating Conditions General MaintenanceChecking Guide Vane Linkage Ð Refer to Fig Contact Seal Maintenance Refer to ÐContact Seal Page Checking Preliminary Alignment Chiller AlignmentMeasuring Angular Misalignment Elevation Alignment Formula HOT Alignment Check Adjusting Angular Misalignment in PlanDoweling Correcting Parallel MisalignmentChanging the Oil Filters Weekly MaintenanceScheduled Maintenance Check Safety and Operating Controls MonthlyCompressor OIL 17EX Chiller Oil SpecicationsPumpout Typical Float Valve Arrangement Sleeve Bearings Page Motor Riggings Inspect the Heat Exchanger Tubes Controls for Optional Pumpout Compressor Troubleshooting GuidePage MAINT04 MAINT01MAINT02 MAINT03PIC 1CR AUXOilpd OiltAutorestart in Progress Starts Limit ExceededFailure to Stop FaultOperation Potential FREEZE-UPRunning Ð Demand Limited Running Ð Temp ControlChiller Protect Limit Faults Autorestart Pending Sensor Fault AlertLOW OIL Pressure AlertDESCRIPTION/MALFUNCTION Probable CAUSE/REMEDY Possible Cause Action External Gear Troubleshooting GuideProblem Possible Cause Ð Item NO.sTemperature Voltage Resistance Drop Ð Thermistor Temperature F vs Resistance/Voltage DropTemperature Voltage Resistance Drop Ð Thermistor Temperature C vs Resistance/Voltage DropInput Options Module Module SwitchControl Modules Module AddressProcessor/Sensor Input/Output Module Psio Fig Starter Management Module SMM FigGRD Options Module Installation of NEW Psio ModuleSwitch Setting Options Module Four-In/Two-Out Module Fig4-In/2-Out Module Physical Data and Wiring Schematics100 Additional Cooler WeightsWeight Vessel SIZE² Condenser Total Weight Condenser Charge101 Additional Condenser WeightsCompressor Weight and Elbow Weight Drive Component WeightsÐ Total Motor Weight, English lb Ð Total Motor Weight, SI kg102 103 Marine Waterbox Cover WeightsNIH Waterbox Cover Weights Approximate Refrigerant HCFC-134a ChargeAuxiliary Systems, Electrical Data Relief Valve Locations and Data104 105 Compressor Fits and Clearances106 Clearance Type DescriptionMeasure Tabulation Ð Impeller Clearances Open-Drive Compressors 10717FX 108 Tewac 109Temp Press110 111 112 General 113Terminal Strip 114GND Ð Ground T1-T4Index Index Index Index Index Copyright 1997 Carrier Corporation

17EX specifications

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