TEL AFA4000/E, Installation And Operating Manual

Page: 13 / 210

AFA4000/E VAV Airflow Controller / p.13
The colour of the velocity on the display screen changes when in an alarm condition, to the
following:
•
Air Safe
Green
•
Low/ High Air Alarm
Red
•
Warning Air Alarm
Amber
An ‘event time line’ segmented into 60 x 1 minute segments scroll across the display (when
enabled). The event time line is displayed as a graphical scale ranging over 0-1.00 m/sec that
progresses across the screen, representing the airflow value at each segment.
The segment colour changes, as follows, if the value is in the range of an airflow alarm:
•
Air Safe
White
•
Low/ High Air Alarm
Red
•
Warning Air Alarm
Amber
The alternative to the event time line is a dynamic ‘bar graph’ representing the airflow velocity.
The output status is permanently displayed under the bar graph or event time line as either
Manual or Automatic . If the controller is configured to dual set-point mode, the status is
displayed as Manual , High Set Point or Low Set Point .
The display shows an up and down arrow icon, , in the bottom right hand corner of the
screen when an input function is set to
Hi / Lo (2 speed operation). The up arrow indicates High
speed and the down arrow indicates Low speed.
•
The display shows a Horn icon (with a line across it) when the audible alarm is muted.
•
The display backlight dims to save energy when the following functions are in use:
•
Fan Off activated - display backlight dims until Fan On is selected.
Backlight brightens to normal level when you access the Set Up or Diagnostics menus.
•
Setback activated - display backlight dims until the Setback is deactivated.
Backlight brightens to normal level when you access the Set Up or Diagnostics menus.
•
Min Pushbutton activated – display backlight dims until Pushbutton III is set to Run or
Max . Backlight brightens to normal level when you access the Set Up or Diagnostics
menus.
•
Auto Dim Screen velocity is exceeded - display backlight dims if the airflow is above the
set value. Backlight brightens to normal level when you access the Set Up or Diagnostics
menus.