High Pressure Cutout, Low Pressure Cutout | Sterling SCW Series

4-8 High Pressure Cutout

This electro-mechanical safety feature opens the control circuit if the system condensing pressure exceeds a safe level.

High pressure cutout setting

	Model	psi	kPa	bars
	SCW Series water-cooled and remote air-cooled	290 psi	2,000 kPa	20 bars
	chilling stations	290 psi	2,000 kPa	20 bars
	chilling stations

Important!

The high pressure cutout is a manual reset control,

so you should reset it once.

If the problem persists, call a refrigeration service technician

to analyze the problem and to reset the control.

4-9 Low Pressure Cutout

This encapsulated switch safety feature prevents the compressor suction pressure from dropping below a pre-set point. It is factory set to open the control circuit when pressure drops below a safe level. The chiller will restart when the suction pressure reaches 30 psi (206.9 kPa/2.1 bars).

	Model	Opens control circuit @			Resets control circuit @
		psi	kPa	bars	psi	kPa	bars

	SCW Series water-cooled and	15 psi	103.4 kPa	1.0 bars	30 psi	206.9 kPa	2.1 bars
	remote air-cooled chilling stations

4-10 Flow Switch

The flow switch shuts down the chiller if the evaporator water flow falls below a safe operating gallons-per-minute (liters-per-minute) flow rate.

SCW Series Central Chilling Stations

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Sterling SCW Series High Pressure Cutout, Low Pressure Cutout, Flow Switch, High pressure cutout setting

Contents

SCW Series Central Chilling Stations SCW Series Central Chilling Stations Wear Safety Glasses and Work Gloves Safety Considerations Table of Contents Indicator Lights and Control Switches MMI Startup Checklists Viewing and Operating Chiller Pumps Charts and Figures Necessary Documents Introduction Models Covered Standard Features Available Options Standard Features on Remote Condensers Model Number Nomeclature Nominal water flow gpm Typical Two-Circuit 60-195 Ton Water Cooled Chiller 460/3/60 Vf 460/3/60 Typical Two-Circuit 60-195 Ton Remote Air Cooled Chiller Scwr Series Remote Condenser Models Event of Shipping Damages Unpacking and Inspection Bill of lading Packing list If the Shipment is Not CompleteIf the Shipment is Not Correct Returns Uncrating Your New Chiller SCW Series Central Chilling Stations Making Electrical Connections Installation Location Considerations Check Compressor Rotation Before Starting Unit Making Process Water Connections Piping ConsiderationsTo 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 CondenserCondenser Water Out Compressor Checking Motor DirectionWater Pump Condenser Fan Lead-Lag Pumps AlarmsStaging Lead-Lag Compressors Refrigeration Circuit Chilled Water CircuitFreezestat Control Percent by Freezing Protection Curve Low Pressure Cutout Flow SwitchHigh pressure cutout setting High Pressure Cutout Optional Condenser Water Manifold Control NozzleControl Probe Chilled Water Manifold SCW Series Central Chilling Stations Water-Cooled SCW Series Startup Checklist Startup Checklists SCW Series Central Chilling Stations Water-Cooled SCW Series Startup Remote Air-Cooled SCW Series Startup Checklist SCW Series Central Chilling Stations Fan Set on Set off Number Psi KPa Bars Remote Air-Cooled SCW Series Startup Shutdown Determining Flow Rate Graphic Panel Devices Indicator Lights and Control Switches MMI SCW Series Central Chilling Stations Operator Interface Using the StandardOperator Interface Introduction SCW Series Standard Control Panel Using the SCW Series Standard Operator Interface Viewing and Operating Chiller Pumps Viewing and Setting System Temperatures Viewing Active Alarms and Handling Alarm Conditions Setting System Temperatures Touchscreen Interface Using the AdvancedTouchscreen Interface Introduction MMI Using the SCW Series Advanced Touchscreen Interface Main Menu Screen Viewing Compressor Status Chiller Status Screen Chiller Configuration Screen SCW Series Central Chilling Stations Compressor Run Time Display Screen Viewing Chiller Pump Status Pump Status Screen Pump Enables Screen Pump Run Time Display Screen Pumps Alarm Condition Screen Viewing and Setting System Temperatures System Status Screen Temperature Input Display Screen Water-Cooled Condenser MaintenanceLubrication Remote Air-Cooled Recommended Pump Tank Spare Parts Evaporator MaintenancePump Motor Seal Makeup Valve Preventive Maintenance Service SCW Series Central Chilling Stations Troubleshooting Problem Possible Cause Solution Verify proper rotation if Service Notes Determining Flow Rate Index SCW Series Central Chilling Stations Service Notes Service Notes Service Notes Parts Department Technical Assistance