23
GA0383P02 Rev. C
Procedures
Some maintenance procedures and most troubleshooting/repair activities will involve gaining
access to the GCM-A’s internal assemblies. In each instance where internal components of
the GCM-A are to be accessed, site management should consider whether power
should be removed from the unit. If the unit remains powered, site management is
responsible for proper safety procedures being used.
To access internal GCM-A components,
· Open the GCM-A’s outer door.
· Remove the six (6) screws from the GCM-A’s subdoor (do not lose the screws).
· Open the subdoor to gain access to the GCM-A’s internal components.
· If internal electronics (PCB’s) will be handled, an electrostatic protective wrist strap
should be worn.
Draining the Humidifier
The Humidifier must be drained before moving the GCM-A. Once the Humidifier has been
drained, the GCM-A should be powered down.
When DRAIN HUMIDIFIER is selected, the GCM-A will stop monitoring particulate levels and
the SYSTEM TROUBLE LED will illuminate. The prompt VALVE OPEN will be displayed on
the LCD display. Disconnect the water line from the water bottle and connect it to a syringe
(E/One Part # 0823-023). Draw back on the plunger of the syringe to draw the water out of
the Humidifier. Disconnect the syringe from the water line and press the syringe plunger to
discharge the water it contains. Repeat this process until all of the water in the Humidifier
has been removed. It has a 15 cubic centimeter capacity. Remove power from the GCM-A.
Adjusting the Ambient 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 Gauge) 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 Gauge 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 Gauge. 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 Gauge
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 ambient 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
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