Modular Electronic Control Systems
Yorkland Stocks the System 450 modular controls, sensors and accessories.
Contact Yorkland Controls , 1.877.733.3833

MECSThe Johnson Controls/PENN System 450 Series is a small, versatile family of compact, multipurpose, digital electronic control, expansion, and power modules.  System 450 modules provide accurate, reliable On/Off and analog control of temperature, pressure and humidity conditions for a wide variety of HVACR and commercial/industrial process applications. The System 450 control system is designed to replace System 350™ control system and System 27 and provide many additional features and benefits with less than a dozen model variations. 


  • Durable, compact modular design with plug-together connectors and DIN rail or direct wall mount capability – eliminates field wiring between modules and allows you to quickly and easily assemble, install, and upgrade your System 450 control systems.
  • Multi-purpose, field-configurable modules designed for global use – enable you to design and configure a wide variety of custom control systems capable of controlling temperature, pressure and humidity (simultaneously), with only a handful of models.
  • Backlit Liquid Crystal Display (LCD) and four-button touch pad User Interface (UI) – provides quick, clear, visual status of the control system’s input sensors and outputs with the touch of a button and enable you to quickly and easily set up and adjust the sensors and outputs in the field.
  • Up to three input sensors and up to ten outputs (relay or analog) – allow you to build both simple and complex applicationspecific control systems and reduce your costs to only the required components.
  • Versatile, all-in-one, stand-alone control modules – provide multipurpose On/Off or analog controls (depending on the model) that are temperature, pressure, and humidity capable out-of-the-box and field configurable to replace a wide variety of HVACR controls.
  • An extensive suite of compatible temperature, pressure, and humidity control sensors – cover a wide range of temperature, pressure (air and refrigerant), and humidity conditions in standard units of measurement. 

JohnsonControls-System450Communication now available in ethernet and Modbus

The popular System 450 is now available in communicating modules for easy easier setup and communications. Available in Modbus and Ethernet for control of HVAC equipment. Analogue and relay control available

Application Notes can be downloaded here.

Contact Yorkland for your application questions at 1-877-733-833 or email at