Sterling A0544325 High Pressure Cutout, Low Pressure Cutout, Remote Start/Stop Interlock

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3-3 High Pressure Cutout

The high pressure cutout is an electro-mechanical safety feature that opens the control circuit if the system condensing pressure exceeds a safe level. The chiller will automatically restart when the pressure drops back to an acceptable level.

Model

Cuts out if condensing pressure exceeds:

SMC050A

275 psi (1,897 kPa)

SMC100A

275 psi (1,897 kPa)

SMC150A

400 psi (2,759 kPa)

Important!

Call a refrigeration service technician to analyze

the problem if high pressure recurs.

3-4 Low Pressure Cutout

The low pressure cutout is an electro-mechanical safety feature that prevents compressor suction pressure from dropping below a preset point.

It is factory set to open the control circuit when pressure drops below a safe level. The chiller will automatically restart when the suction pressure reaches an acceptable level.

Model

Cuts out if suction pressure falls below:

SMC050

15 psi (103 kPa)

A

 

SMC100

15 psi (103 kPa)

A

 

SMC150

35 psi (241 kPa)

A

 

3-5 Remote Start/Stop Interlock

A contact is provided to allow interlocking of the SMC Series Chiller with process controls. To use this feature, remove the jumper between Terminals X1 and 1 on Terminal Block 1. Supply a switch or dry contact interlock connected in series between these two terminals. See Figures 14 and 15 on Pages 32 and 33 for more information.

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SMC Series Chillers

 

 

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Contents SMC-050 to SMC-150 Series SMC Series Chillers Safety Considerations Table of Contents Table of Contents Charts and Figures Necessary Documents General InformationIntroduction Models CoveredAvailable Options Uncrating Your New ChillerEvent of Shipping Damages If the Shipment is Not CompleteIf the Shipment is Incorrect Returns SMC050A Process Pump CurvesSMC100A Process Pump Curves SMC150A Process Pump Curves SMC Series Chiller Specifications SMC-150 25,400 16,000 12A 345Chiller Installation Electrical ConnectionsProcess Water Connections SMC Condenser Air Supply Water ReservoirEthylene Glycol Curve Overhead Process Considerations Overhead PipingSequence of Operation Chilled Water CircuitRefrigeration Circuit High Pressure Cutout Low Pressure CutoutRemote Start/Stop Interlock SMC Component Identification Piping Schematic 1 Pump with Reservoir End of unit pipingPiping Schematic 1 Pump without Reservoir Piping Schematic No Pump, No Reservoir SMC Pre-Startup Checklist SMC Startup ChecklistSMC Water Circuit Pressure Drop Table Setting the Process Water Temperature Setting the Alarm ValueMicroprocessor Control SMC Control SP ALIndicator Lights SwitchesOptional Graphic Panel SMC Series Optional Graphic PanelLubrication Routine MaintenanceCondenser Maintenance Typical SMC SubpanelTypical SMC Wiring Schematic SMC Wiring Schematic for Chillers with No Pump or Reservoir SMC Series Chillers Troubleshooting Guide Problem Possible cause SolutionProblem Possible cause Solution SMC Spare Parts List DescriptionService Notes Service Notes Sterling/Sterlco Milwaukee, WI5200 West Clinton Avenue 414 Fax 414
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