- Preston Refrigeration
Electrical Automation and Controls
Updated: Aug 19, 2019
Our control systems are automated with industry leading PLC/PAC automation hardware, custom refrigeration control panels built in our UL Listed Panel Shop and programming with the latest industry-leading software to meet all process requirements. We use tried and proven standardized programs for refrigeration controls, which are modified to meet process needs.
Our advanced control system contains a computer HMI system to allow operators and supervisors the ability to control and operate their refrigeration system. We offer manual backup capabilities with all of our automated control systems to ensure refrigeration is operational even if automation goes offline.
Preston will engineer the project and provide a complete set of electrical schematics to show all wiring terminations. At job completion we will provide field wiring drawings for electrical contractors to build the project as well as all as-built completed drawings, PLC and HMI programs and will train your refrigeration operators on the control system.

Refrigeration Process Controls
Compressor Sequencing
Condenser Fan Sequencing (VFD, FVNR and combination)
Condenser Pump Sequencing and Water Sump Level Control
Ammonia Liquid Control
Vessel (Accumulator, Recirculator, Intercooler, etc..) Control
Evaporator Valve Control (Solenoids, MOV, Actuators)
Evaporator Fan Control (FVNR, FVR, VFD, Recipe)
Temperature or Pressure Refrigeration Valve Control
Defrost Controls (Accumulated or Time of Day)
Local Recipe Blast Controls
Chiller Control
Pump Out Control
System Monitoring
High and Low Pressure Alarms
High and Low Vessel Level Alarms
Ammonia Detection Alarm and Corrective Action Feedback
Refrigeration Motor Feedback for Running or Failure Alarm
Refrigeration Equipment Status
Refrigeration Zone Temperatures
Temperature Trending on Graphics System
Pressure Trending on Graphics System
Energy Usage
Refrigeration Energy Management Controls
Suction Pressure Optimization by Compressor Sequencing
Discharge Pressure Optimization by Compressor Sequencing
Refrigeration Recipe Controls
Night and Weekend Temperature Setback Program
Refrigeration Load Shedding based on Energy Usage
Power Factor Correction Design Optimization
Associated Process Controls
Chilled Water Automated Spray Control System Controls
Automated Product Conveying Controls
Walking Beam Conveying and Product Sorting Automation
Process Control Systems in conjunction with Refrigeration
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