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Chapter 4: Basic Operation
4-1 Turning the Power On
When AC power is first applied to the unit, the following sequence of events will occur:
1. The LCD backlight lights up.
2. The LCD displays dashes: LEDs have all segments on.
3. The LCD displays the PROM Rev/Date.
4. The LCD displays “SelfTest in Progress.”
5. If the ‘Debug’ parameter is enabled, the following messages about Option Cards can
be displayed:
Re-Transmit
Detected
Cool Analog
Detected
Heat Analog
Detected
Serial Comm
Detected
None Installed
6. The LED segments turn off.
7. The LCD backlight turns off.
8. The LCD displays “Power Available/System OFF.”
At this point, a Manual Vent Operation can be initializeed for 8 seconds by pressing the Vent
button.
The unit is now in a standby mode of operation. No system process control will occur until
the Start button is pressed.