Sterling A0544325 Sequence of Operation, Chilled Water Circuit, Refrigeration Circuit

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Sequence of Operation

 

 

Important!

•The SMC unit has a leaving water temperature range of 30°F (-1°C) to 65°F (18°C). Do not attempt to run the SMC unit outside this temperature range or damage to the unit may occur.

•When operating the SMC unit between 30°F (-1°C) and 40°F (5°C), you must use a solution of 75% water and 25% industrial-grade ethylene glycol with a suitable corrosion inhibitor to protect the SMC unit from freeze-up. See Figure 5 on Page 17 for more information. Such damage is not covered by the Sterlco warranty.

3-1 Chilled Water Circuit

Figures 8, 9, and 10

;Process cooling water supply and return connections are made at the pipe stubs at the rear of the chiller.

;Warm water returns from the process and enters the reservoir tank.

;The process water is pumped through the evaporator where it is cooled.

;The coolant flows to the process and returns to repeat the cycle.

;A chilled water bypass assembly (patent pending) between the supply and return lines guarantees a constant flow through the evaporator during intermittent low or no-flow conditions.

;A flow switch in units without pumps will prevent the compressor from running without adequate flow through the evaporator

3-2 Refrigeration Circuit

„Liquid refrigerant from the condenser passes through a filter/dryer which removes moisture and other contaminants.

„The refrigerant then passes through the thermal expansion valve which allows the refrigerant to expand and cool the inside of the heat exchanger. The refrigerant flows through the suction line to the compressor.

„The refrigerant gives up its heat as it re-condenses to a liquid in the condenser and the cycle starts over again.

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 Introduction General InformationNecessary Documents Models CoveredUncrating Your New Chiller Available OptionsIf the Shipment is Incorrect Event of Shipping DamagesIf the Shipment is Not Complete SMC100A Process Pump Curves ReturnsSMC050A Process Pump Curves SMC150A Process Pump Curves SMC-150 25,400 16,000 12A 345 SMC Series Chiller SpecificationsProcess Water Connections Chiller InstallationElectrical Connections Water Reservoir SMC Condenser Air SupplyEthylene Glycol Curve Overhead Piping Overhead Process ConsiderationsRefrigeration Circuit Sequence of OperationChilled Water Circuit Remote Start/Stop Interlock High Pressure CutoutLow Pressure Cutout SMC Component Identification End of unit piping Piping Schematic 1 Pump with ReservoirPiping Schematic 1 Pump without Reservoir Piping Schematic No Pump, No Reservoir SMC Startup Checklist SMC Pre-Startup ChecklistSMC Water Circuit Pressure Drop Table Microprocessor Control Setting the Process Water TemperatureSetting the Alarm Value SP AL SMC ControlOptional Graphic Panel Indicator LightsSwitches Optional Graphic Panel SMC SeriesCondenser Maintenance Routine MaintenanceLubrication Typical SMC SubpanelTypical SMC Wiring Schematic SMC Wiring Schematic for Chillers with No Pump or Reservoir SMC Series Chillers Problem Possible cause Solution Troubleshooting GuideProblem Possible cause Solution Description SMC Spare Parts ListService Notes Service Notes 5200 West Clinton Avenue 414 Fax 414 Sterling/SterlcoMilwaukee, WI
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