PSG Chiller Control - Retrofit/Upgrade Control Package

Upgrade your Process Chiller Controls

call: 877-988-5464 x 100

Legacy - HMI touch screen with built in webserver, trending, SD card storage and RJ-45 Ethernet port.

Legacy - Pentra PLC with Expandable I/O


PSG Retrofit Controller Brochure

Installation notes

PSG chiller controller retrofit/upgrade package should be installed by an HVACR service professional. This package allows for retrofit/upgrade on the following Legacy process chiller models: PAC,PACT,VPACT,PWC,PWCT and all semi hermetic chiller models. 

Standard Features

  • Ultra bright 5.7 inch Color LCD OI Touch Screen with auto screen saver
  • 15 Control Screens with built-in help features.
  • Real-time Pressure and Temperature readings
  • Real-Time SuperHeat, Subcooling, Chiller Supply and Chiller Return temperature graphical trending
  • Automatic COMPRESSOR Lag/Lead with FIVE operational modes
  • Automatic SYSTEM PUMP Lag/Lead with FIVE operational modes.
  • Control up to two system pumps
  • Manual and auto system pump control from HMI home screen
  • Factory configured for ALL Legacy available chiller options.
  • Control operates to a +/- 1°F accuracy
  • Powered from the chiller 24 volt control circuit. No high voltage interference.
  • Operates and displays in °F
  • Controls cooling on inlet or outlet temperature
  • Monitors and logs compressor/pump run hours
  • USB update slot for IN-PLACE HMI and PLC software updates available from website.
  • CE, UL Listed
  • Built in Web Server via HMI
  • SD slot for optional data storage on HMI
  • Highly accurate and fast performance
  • Embedded Ethernet Port
  • Preprogramed remote start/stop set up for customers dry contact connection.
  • Modbus TCP, RTU and ASCII for integration with most Building Automation Systems (BAS)
  • Optional BacNet and LONWORKS communication protocols via third party bridge hardware
  • Expandable I/O, ideal for custom (OEM) chiller projects.
  • I/O status indicators on Pentra and I/O modules.
  • Optional service alerts. Get an email or phone call about potential maintenance or service issues.
  • Using native networking capabilities of PENTRA multiple remote HMI's connected to chiller can be accomplished.
  • Using EWON (optional), a secure VPN connection is now possible for remote Intranet or Internet operation of chiller via IE, Firefox or Chrome browsers.
  • Pentra PLC outputs control IDEC's RV1H pilot relays rated to 6 amps. The RV1H relays are plugin and 100% field replaceable.
  • Pentra PLC/HMI have been load stress tested to an ambient temperature range of -10F to 120F.
  • HMI provides onboard help with troubleshooting tips. Using QR codes (shown) on screen, users can access detailed troubleshooting tips and video's via Legacy's dedicated web server.
  • COMING soon via EWON (optional) Legacy will provide a subscription based Mission Critical monitoring service.


For more information or to Pre-Order call: 877-988-5464 x 100