Product Overview

System 450™ Series Modular Controls Product Bulletin2
System 450 Overview
The 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 SPDT
and analog control of temperature, pressure, and
humidity conditions for a wide variety of HVACR and
commercial/industrial process applications.
A System 450 control system includes:
• a single System 450 control module
• one to three inputs
• one to ten relay and/or analog outputs (provided by
the control module and expansion modules)
A System 450 control system often also includes a
System 450 power module.
A System 450 control system is the next generation of
System 350 and System 27 modular controls, but a
System 450 control system, with less than a dozen
model variations, provides far more features and
flexibility than either a System 350 system (54 models)
or a System 27 system (40 models).
Compact Modular Plug-Together Design
All System 450 modules feature a compact, durable,
gray Lexan
® housing with DIN rail clips and slotted
mounting holes molded into the back of the housing for
easy installation.
System 450 modules also feature 6-pin connectors on
the sides of the housing, enabling easy assembly and
upgrade of your control systems and eliminating the
need for field wiring between modules.
A System 450 control system provides compact, clean,
and consistent control system assemblies that are
simple to build, install, and maintain.
Multipurpose and Field Configurable
System 450 control, expansion, and power modules
are multipurpose devices that can be easily configured
in the field to operate as a temperature, pressure, or
humidity control system.
In fact, a System 450 control system can be quickly
assembled and easily configured in the field to monitor
and control temperature, pressure, and humidity
conditions simultaneously.
Note: C450RxN-x Reset Control Modules control
temperature and humidity, but not pressure.
Global Design
System 450 modules are designed, tested, and
certified for global application and are Underwriters’
Laboratories, Inc. (UL) Listed and CE compliant.
System 450 control systems can be set up in standard
units of measurement used worldwide; Fahrenheit,
Celsius, psi, bar, inches water column (in. W.C.), and
Relative Humidity (RH).
High Input Signal Selection Enables your control system to monitor temperature, pressure, or humidity
conditions with two or three sensors (of the same type) and control your
system outputs based on the highest condition value sensed by the
referenced sensors.
Differential Control Enables your control system to monitor and maintain a temperature,
pressure, or humidity differential between two sensor points within a
system, process, or space.
A User-Defined Reset Setpoint Sensor
(C450Rxx Reset Control Modules Only)
Provides a calculated (variable) reset setpoint based on an ambient
(master) sensor and a control loop sensor, which saves you energy in a
wide variety of temperature and humidity reset control applications.
Adjustable Minimum and Maximum Setpoint
Temperatures
(C450Rxx Reset Control Modules Only)
Enable compliance with the manufacturer’s specifications for your
controlled HVACR and process equipment.
Selectable Shutdown-High and
Shutdown-Low Temperature Settings
(C450Rxx Reset Control Modules Only)
Saves you energy by shutting down controlled equipment when the
ambient temperature either rises or drops to a point where heating or
cooling is no longer required.
Adjustable Setback Temperature
(C450Rxx Reset Control Modules Only)
Saves you energy by adjusting the supply temperature setpoint up (for
cooling) or down (for heating) during unoccupied time periods.
Table 1: Features and Benefits (Part 2 of 2)
Features Benefits