24
GA0383P02 Rev. C
(turn the screw clockwise to decrease the flow and reduce the differential pressure).
The GCM-A monitors the airflow through the zone manifold and generates a warning
indication if it drifts significantly from its nominal value. The GCM-A detects significant drift by
comparing the airflow against two software adjustable airflow limits. These flow limits should
be reset after adjusting the airflow through the zone manifold.
The procedure that resets the airflow limits is accessed through the SETUP menu. Select
SETUP from the main menu then AMBIENT FLOW ADJ from the SETUP menu. The GCM-A
will display the ambient airflow in liters per minute. Press the ENTER key to set the limits.
The GCM-A will respond by flashing SETTING LIMITS for two seconds while it sets the
ambient low flow limit and the ambient high flow limit. The ambient low flow limit is set to 50
percent of the indicated airflow reading, and the ambient high flow limit is set to 150 percent
of the indicated airflow reading.
Disconnect the differential pressure gauge and replace the sealing caps on the zone
manifold taps.
Adjusting the Generator Airflow
Allow the flow meters to stabilize by letting the GCM-A warm up for at least 15 minutes prior
to making this adjustment.
IMPORTANT! It is important to note that the GCM-A system addresses flow monitoring in
two ways; the first is by using an external instrument (DP Gage) to validate flow through the
zone manifold. The second method is by way of internal air flow sensors located within the
inlet manifold of the GCM-A. For the purposes of system design parameters and validation,
the DP Gage is designated as the authoritative source of information regarding flow across
the zone manifold. The GCM-A’s internal flow sensor indication, while accurate, may differ
slightly from the DP Gage. So long as the difference is minor, the end-user need not be
concerned. Should the difference between the GCM-A’s internal indicator and the GP Gage
exceed 25 percent, contact Environment One at +1 518 346-6161 or www.eone.com/
detection, for technical support.
Locate the zone manifold that supplies generator air to the GCM-A. Connect a differential
pressure gauge to the taps on the zone manifold (see Figure 12). Loosen or tighten the allen
head flow adjustment screw until the differential pressure gauge reads 6 inches of water
(turn the screw clockwise to decrease the flow and reduce the differential pressure).
The GCM-A monitors the airflow through the zone manifold and generates a warning
indication if it drifts significantly from its nominal value. The GCM-A detects significant drift by
comparing the airflow against two software adjustable airflow limits. These flow limits should
be reset after adjusting the airflow through the zone manifold.
The procedure that resets the airflow limits is accessed through the SETUP menu. Select
SETUP from the main menu then GENERATOR FLOW ADJ from the SETUP menu. The
GCM-A will display the ambient airflow in liters per minute. Press the ENTER key to set the
limits. The GCM-A will respond by flashing SETTING LIMITS for two seconds while it sets the
generator low flow limit and the generator high flow limit. The generator low flow limit is set to
50 percent of the indicated airflow reading and the generator high flow limit is set to 150
percent of the indicated airflow reading.
(Adjusting the Ambient Airflow, cont’d)
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