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The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult the local Johnson Controls office.
Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. © 2015 Johnson Controls, Inc. www.johnsoncontrols.com
R-206
System 450™ Reset Control Modules with Real-Time Clock
and Relay Output
Code No. LIT-1900658
Description
System 450™ is a family of modular, digital electronic controls that is
easily assembled and set up to provide reliable temperature, pressure,
and humidity control for a wide variety of HVAC/R applications,
commercial process applications, and industrial process applications.
System 450 Reset Control Modules provide many of the features of the
standard models for temperature and humidity control. In addition,
these modules provide setpoint reset, real-time setback scheduling,
and run-time balancing (equal run time) capability.
The System 450 control system is designed to replace System 350™
and System 27 control systems, and to provide many additional
features and benefits with fewer than twenty model variations.
System 450 control modules provide a field-configurable
out-of-the-box solution. Most System 450 control modules can control
temperature, pressure, and humidity systems simultaneously.
A single C450 control module can be set up as a stand-alone control or
connected to expansion modules to control up to ten On/Off relay and
proportional analog outputs, based on any of the three available inputs.
Refer to the following documents for important product application
information:
• System 450™ Series Modular Controls Product Bulletin
(LIT-12011458)
• System 450™ Series Modular Control Systems with Reset Control
Modules Technical Bulletin (LIT-12011842)
• System 450™ Series Reset Control Modules with Real-Time Clock
and Relay Output Installation Instructions (Part No. 24-7664-2888)
Features
• Durable, compact, interchangeable modular components with
plug-together connectors and DIN rail or direct wall mount capability
eliminate field wiring between modules and allow you to quickly and
easily design, assemble, install, and upgrade your control systems.
• Versatile, multipurpose, field-configurable control modules and
expansion modules designed for global use allow you to create a
wide variety of application-specific control systems capable of
controlling temperature, pressure, or humidity, or all three
conditions simultaneously, with only a small suite of module models.
• Up to three hard-wired input sensors and up to ten relay or analog
outputs (in any combination) per control system allow you to build
complex custom control systems while reducing your control system
cost to only the cost of the required components.
• Control Modules with bright backlit LCDs and four-button touch pad
user interfaces provide quick, clear, visual status of your
System 450 control system inputs and outputs with the touch of a
button and enable you to quickly and easily set up and adjust your
control system.
• Multipurpose, all-in-one control modules enable simple stand-alone,
single-module control systems that are temperature, pressure, and
humidity capable out of the box and easy to set up in the field to
replace a wide variety of OEM HVAC/R and process controls.
• An extensive suite of compatible temperature and humidity sensors,
and pressure transducers allows you to monitor and control a wide
range of HVAC/R and process conditions in a variety of standard
and global units of measurement.
• High input signal selection enables your control system to monitor a
temperature, pressure, or humidity condition 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.
Reset Control Features
• Adjustable minimum and maximum setpoint temperatures (reset
control modules only) enable compliance with the manufacturer’s
specifications for your controlled HVAC/R and process equipment.
• Selectable shutdown-high and shutdown-low temperature settings
(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.
• Real time clock and adjustable setback temperature (reset control
modules only) save you energy by setting back heating, cooling, or
humidity setpoints during scheduled unoccupied periods (24-hour
day, 7-day week schedule).
• User-defined reset control capability (reset control modules only)
saves you energy in a wide variety of temperature and humidity
reset control applications by adjusting the temperature or humidity
control loop, based on changes in ambient outdoor temperature or
other uncontrolled condition.
Repair Information
If the System 450 Reset Control Module fails to operate within its
specifications, replace the unit. For a replacement System 450 Reset
Control Module, contact the nearest Johnson Controls®
representative.
C450RCN-3 Reset Control Module with
Real-Time Clock and Relay Output
System 450 Control Series