120 ● gForce Ultra User Manual 10-2014
atmosphere, it is advisable to replace the filter drier. The equivalent type and size
should be used.
10.6 Current Sensing Relay
The current sensing relay is set at the factory and does not normally require adjustment
in the field. But if the plug fan speed operating mode is change in the field and
requires the no airflow alarm to be adjusted, follow these instructions:
Figure 1 below shows a current sensing relay (CT) used to detect a “No Airflow Alarm”.
Before starting the adjustment, make sure you have a small flat blade screw driver that
can fit in the potentiometer slot of the relay.
When the green LED is on, the “No Airflow Alarm” message will appear.
When the red LED is on, the “No Airflow Alarm” message will disappear.
Figure 1: "No Airflow Alarm" Current Sensing Relay
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