Johnson Controls System 450 Series Technical Bulletin

• When you are in any system setup start screen, click M repeatedly to scroll through the system
setup menu screens for your control system. You cannot enter values in the system setup
menu screens.
• To leave setup mode at any time, press and hold Up and Down for 1 second.
Note: You must set up the sensors before you can set up the outputs. See Setting up the sensors
and transducers for procedures to set up the sensors.
• In system setup screens with flashing values, press Up or Down to change the parameter
value. When the required parameter value flashes in the setup screen, press Next to save the
selected value and go to the next setup screen.
• After 2 minutes of inactivity in a system status or system setup screen, the controller exits the
system setup mode and the LCD reverts to the sensor status screens.
Accessing and navigating the UI
System 450 control modules feature a backlit LCD for monitoring system status and a four-button
touchpad UI that you can use to set up the sensors and outputs in your control system. Figure 1
shows the condensing unit control module UI features and functions.
During normal operation, the condensing unit control module LCD displays the sensor status
screens. The main screens are the sensor status screens, which scroll automatically and provide a
real-time status of the conditions sensed at the hard-wired sensors.
Sensor and output status screens
Condensing unit control module main screens display the status at the hard-wired Sn-1 and Sn-3
sensors if you use them in the control system.
From the sensor status screens, you can scroll through and view the output status screens.
When the control module LCD automatically scrolls through the sensor status screens, hold Next to
scroll through and display the sensor status screens and the output status screens for all sensors
and outputs set up in your control system.
When you stop holding Next, the sensor or output status screen that you are viewing displays for
2 minutes before it times out and returns to the main screens. During the 2 minute pause, you can
monitor a sensor that changes quickly during system setup or normal system operation.
Figure 2 shows the sensor status and the sensor and output status screens for a standard
condensing unit control system.
Accessing the system set up and menu screens
1. In the main screens, press Up and Down simultaneously. The SENS screen displays.
2. Press M to scroll through the system setup menu screens.
3. To scroll through and set up the associated parameters, press Next on any of the system
setup screens.
4. To return to the setup start screen, in any of the system setup screens, press M.
5. To return to the main screens from any setup start screen, press Up and Down simultaneously
or wait for 2 minutes.
Navigate to the following system setup menu screens in the condensing unit control module UI:
• SENS: Sensor setup start. Configure the sensor types and error offsets for the sensors that the
system uses.
System 450 Series C450CCU Condensing Unit Control System Technical Bulletin28

Johnson Controls System 450 Series Specifications

General

Brand	Johnson Controls
Model	System 450 Series
Category	Control Unit
Language	English