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CAUTION: CAL Err St may result from a sensor that has not reached thermal equilibrium.
Nitrogen Production Flow Rate Check Procedure
The production rate of the nitrogen generator can be verified using the production flow meter in the
nitrogen generator cabinet (see section 6.j., for the Generator Configuration Diagrams).
1. With the nitrogen generator powered and in the nitrogen production mode:
a. Open the nitrogen production flow meter isolation ball valve to automatically start the
nitrogen generator.
b. Close the regulated and fast fill valves on the air maintenance device (AMD) to the fire
sprinkler system(s).
c. Read and document the nitrogen production flow rate on the nitrogen production flow meter.
i. Flow rate indicated is in standard cubic feet per hour (SCFH).
ii. The production rate is measured using the center of the silver ball in the flow meter.
d. Open the regulated valve on the AMD to the fire sprinkler system(s).
e. Close the flow meter isolation ball valve.
f. Compare the nitrogen production flow rate with the nitrogen production values listed in the
following chart.
Nitrogen Generator Flow Rates
Production Rate – SCFH (L/min)
AG-675 Wall Mount w/ Integral Air Compressor
AG-950 Wall Mount w/ Integral Air Compressor
AG-2000 Wall Mount w/ Integral Air Compressor
AG-3500 Wall Mount w/ Integral Air Compressor
AG-6500 Stand Alone w/ 7.5 hp Air Compressor
AG-11000 Stand Alone w/ 7.5 hp Air Compressor
AG-18500 Stand Alone w/ 7.5 hp Air Compressor
AG-22500 Stand Alone w/ 10 hp Air Compressor
NOTES: If production flow rate is lower than flow rates in the production chart, check pressure regulator
of the excess bleed off assembly.
If production flow rate identified and documented varies more than 10% of the flow rates in
the production chart, contact ECS.
NITROGEN GENERATOR SHORT CYCLING PREVENTION PROCEDURE
In situations where the nitrogen generator experiences short cycling, the short cycling is typically the
result of an erratically operating air maintenance device (AMD). Installations where the AMD doesn’t close
properly or partially closes, the nitrogen supply line pressure increases to the cut-out (turn-off) pressure
of the nitrogen generator before the sprinkler systems being supplied are at the proper operating
pressure. Because one or more of the supplied systems did not reach the proper operating pressure when
the nitrogen generator shuts off. The nitrogen supply line depressurizes through the AMD into the
sprinkler system(s). This depressurization allows the supply line pressure to fall below the cut-in (turn-on)
pressure of the nitrogen generator resulting in the nitrogen generator turning on. The process of filling
the nitrogen supply line is repeated.
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