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.


Additional Engineering & Services Available


  • Project Design

  • Service and Power Distribution

  • Motor Control

  • Lighting

  • Specification Design

  • Scope of Work

  • Consulting and Project Management

  • System Troubleshooting

  • Control System Coordination

  • System Upgrades and Maintenance

Refrigeration Process
  • Compressor Sequencing

  • Condenser Fan Sequencing 

  • Condenser Pump Sequencing
    Water Sump Level Control

  • Ammonia Liquid Control

  • Vessel 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

  • 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

System Montoring
Refrigeration Energy Management 
Associated Processes
  • 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

  • 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

© 2018 Preston Refrigeration Co., Inc.
6100 Stilwell St - Kansas City, Missouri 64120

P. 913 225-5500  -  F. 913 621-6962