Staging, Alarms, Lead-Lag Compressors | SterlingTEK A0551797

4	Sequence Of Operation

4-1 Staging

1.The system uses a PID control algorithm to regulate the chilled water temperature. As the required control effort increases or decreases, the system compressors are turned on or off to keep the temperature at the specified set-point

2.Compressor anti-recycle time is three (3) minutes.

4-2 Alarms

If a fault occurs, that compressor or circuit is deactivated. The load will automatically shift to any other compressors that are currently ON-LINE, but not running. Lead/Lag rotation will continue to function. Compressors that are faulted will be removed from the rotation order.

4-3 Lead-Lag Compressors

The system automatically rotates the compressor order to generate a Lead/Lag rotation. Any time a compressor is faulted or manually taken OFF-LINE, it will be removed from the Lead/Lag rotation.

Once the fault is cleared or manually put ON-LINE, the compressor is returned to the Lead/Lag rotation at the end of the rotation order.

4-4 Lead-Lag Pumps

The system automatically rotates the pump order to generate a Lead/Lag rotation. Any time a pump is faulted or manually taken OFF-LINE, it will be removed from the Lead/Lag rotation. Once the fault is cleared or manually put ON-LINE, the pump is returned to the Lead/Lag rotation at the end of the rotation order.

SSC Series Central Chilling Stations

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SterlingTEK A0551797 manual Staging, Alarms, Lead-Lag Compressors, Lead-Lag Pumps

Contents

SSC Series Central Chilling Stations SSC Series Central Chilling Stations Wear Safety Glasses and Work Gloves Safety Considerations Table of Contents Getting Started on the SSC Series Advanced Touchscreen Startup Checklists Charts and Figures Necessary Documents Introduction Models Covered Standard Features Available Options Standard Features on Remote Condensers Model Number Nomeclature Model SSCW-xxx Typical Two-Circuit 60-100 Ton Water Cooled Chiller Cooling Capacity tons @ 50F 10 C LWT 73.1 81.4 Model SSCR-xxx Typical Two-Circuit 60-100 Ton Remote Air Cooled Chiller Sscr Series Remote Condenser Models Event of Shipping Damages Unpacking and Inspection If the Shipment is Not Complete If the Shipment is Not CorrectReturns Uncrating Your New Chiller SSC Series Central Chilling Stations 3Installation Installation Location ConsiderationsMaking Electrical Connections SSC Series Central Chilling Stations Piping Considerations Making Process Water ConnectionsAll Models From Process Making Tank Piping Connections Making Water-Cooled Condenser Connections Water Connection Sizing ConsiderationsGalvanic Corrosion Considerations Water Treatment Considerations Condenser Water Installing the Remote Air-Cooled Condenser Compressor Checking Motor Direction SSC Series Central Chilling Stations Lead-Lag Pumps AlarmsStaging Lead-Lag Compressors Chilled Water Circuit Refrigeration CircuitFreezestat Control Freezing Protection Curve Volume Flow Switch High Pressure CutoutLow Pressure Cutout Condenser Water Manifold Control NippleControl Probe Chilled Water Manifold SSC Series Central Chilling Stations Water-Cooled SSC Series Startup Checklist Startup Checklists SSC Series Central Chilling Stations Water-Cooled SSC Series Startup Remote Air-Cooled SSC Series Startup Checklist SSC Series Central Chilling Stations Remote Air-Cooled SSC Series Startup Shutdown Determining Flow Rate SSC Series Central Chilling Stations SSC Series Central Chilling Stations Graphic Panel Devices Indicator Lights and Control Switches MMI SSC Series Central Chilling Stations Using the Standard Touchscreen InterfaceTouchscreen Interface Introduction MMI SSC Series Standard Control Panel Using the SSC Series Standard Touchscreen Interface Main Menu Screen Viewing and Operating Chiller Compressors Viewing Compressor StatusCompressor Status Screen Operating the chiller compressors Chiller Configuration Screen Compressor Lead/Lag Screen Compressor Enable Screen Compressor Run Time Display Screen Viewing Compressor Run Times Viewing and Operating Chiller Pumps Viewing Chiller Pump StatusPump Status Screen Operating Chiller Pumps Pump Enables Screen Viewing Pump Run Times Pump Lead/Lag ScreenPump Run Time Display Screen Alarm Condition Screen Viewing Active Alarms and Handling Alarm Conditions Or Death Setting System Temperatures Viewing and Setting System Temperatures SSC Series Central Chilling Stations Using the Advanced Using the SSC Series Advanced Touchscreen Interface Main Menu Screen Viewing and Operating Chiller Compressors Chiller Status Screen Operating the chiller compressors Viewing Compressor Run Times Viewing and Operating Chiller Pumps Viewing Chiller Pump Status Operating Chiller Pumps Hourmeters Pump Run Time screen displays Viewing Active Alarms and Handling Alarm Conditions Alarm Condition Screen Or Death System Status Screen Temperature Input Display Screen Lubrication Condenser Maintenance Recommended Pump Tank Spare Parts Evaporator MaintenancePump Motor Seal Makeup Valve Preventive Maintenance Service SSC Series Central Chilling Stations Problem Possible Cause Solution 10Troubleshooting Allow time to cool and reset Verify proper rotation if Service Notes Index Water Treatment Service Notes Service Notes Service Notes Sterling Th Street New Berlin, WI 262 641-8610 ∙ Fax 262 Parts Department