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Step 3c: Plumb the Nitrogen/Air Supply Line – With House/Plant Air Supply (Figure 3c)
A separate house/plant air supply can be used to meet the NFPA 13 30-minute fill requirement or as a
back up to the nitrogen generator. In this application, the nitrogen/air discharge plumbing from the
Nitrogen Generator and the separate hose/plant air supply are connected to the dry pipe or preaction
valve trim with isolation valves in each supply line using a minimum ½” black steel, galvanized steel, or
copper lines. The size of the nitrogen/air supply line must be based on both the length of pipe between
the nitrogen generator and fire sprinkler systems and the total volume of fire sprinkler systems being
supplied.
NOTES: The Nitrogen Generator requires an in-line Air Maintenance Device (AMD) that is equipped with
an on-board field adjustable pressure regulator for each sprinkler system being served.
Acceptable AMD models are the Reliable Model A, Tyco Model AMD-1 and Victaulic Series 757.
When AG-675 or AG-950 nitrogen generator is connected to a single dry pipe or preaction system,
the nitrogen generator can be installed without an AMD. ECS recommends a ball valve and a check
valve be installed in the nitrogen/air supply line.
Figure 3c
Approved Air Maintenance Device (AMD)
Reliable Tyco Victaulic ECS
Model A Model AMD-1 Series 757 AG-675/950
Step 4: Plumb the Condensate Drain Line
The Nitrogen Generator will occasionally discharge a small amount of condensate water from the
coalescing filters inside the cabinet. It is recommended that the ¼” drain connection be plumbed to a floor
drain or building exterior. When plumbing to a drain is not feasible an evaporative collection chamber can
be used.
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