Installation, Operation and Maintenance Manual
Page
42
of
100
2.
Adjust the “Return to Auto” to 300 seconds. This will allow time to operate the plug fan(s) at a lower
speed to make the current sensing switch adjustment before returning the unit back to normal
operation.
3.
Move to Menu Analog Output 3 and adjust the fan speed to the desired low limit operating point. In
this example, the low limit is 30%. Change the “Mode” to “Manual” and “Manual Value” to 3.00VDC.
4.
At this point, the fan will be running at 30% of
the fan’s
base speed and you might see the display shows
“No Airflow Alarm” because the fan
(s) are running at a slower speed than normal operation.
Figure 15 - CT Trip Adjustment and LEDs
