Johnson Controls System 450 Series Technical Bulletin

Table 1: Condensing unit control module UI
Callout Feature Description
1 Status or setup
value
• The current input status, output status, or setup parameter
value for the input sensor and setup parameter displays.
• To select a different parameter value when the value flashes,
press Up or Down.
• The output continues to scroll between screens, depending
on which features activate on the C450CCU controller. In
Screen 1, you can view the temperature of the refrigerated
space as the sensor that wires to input Sn-1 measures. In
Screen 2, you can view the system suction pressure when
using the pump down feature. In Screen 3, you can view the
current time of day. You can set the format of the TIME menu
in the CLK screen to 12h or 24h. For information on additional
screens, see Sensor and output status screens.
• When the module activates an alarm, alarm codes appear in
the display. The alarm codes blink until the System 450 auto
reset feature clears them or you manually correct the cause
of the alarm. For more information on alarms and respective
alarm codes, see Supported alarms.
2 LED The LEDs on the control module indicate the status of the load or
the equipment that the relay controls. The LED matches the ON or
OFF status that displays on the screen for that output, provided the
functionality is direct acting. For example NRGZ = ON. For reverse
acting, the behavior is opposite.
3 Next • In the main status screens, to scroll through the system status
screens, press Next.
• In a setup screen, to save the flashing setup value and go to
the next setup screen, press Next.
4 Up and down • To select a different value for any flashing value in the setup
value field, press Up or Down.
• To access the setup menu screens, from any status screen,
press and hold Up and Down for 5s.
• To leave setup mode at any time, press and hold Up and
Down for 1s.
5 Menu To move through the sensor and output setup menu screens,
press M.
6 Status or setup
parameter
• The unit of measurement, output, sensor number, or setup
parameter for the displayed status or setup value displays.
• In Figure 1, the setup identifier or SP represents the setpoint.
7 LCD • Backlit LCD screen
• During normal operation, the sensor status screens display on
the LCD.
7System 450 Series C450CCU Condensing Unit Control System Technical Bulletin

Johnson Controls System 450 Series Specifications

General

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