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a. If the nitrogen purity is above 98%, decrease the nitrogen purity by turning the Nitrogen Flow
Control Valve counterclockwise in ⅛ turn increments (See Maintenance Section for Generator
Configuration Diagram).
b. If the nitrogen purity is below 98%, increase the nitrogen purity by turning the Nitrogen Flow
Control Valve clockwise in ⅛ turn increments (See Maintenance Section for Generator
Configuration Diagram).
IMPORTANT NOTE: Nitrogen purity and nitrogen production rate are inversely proportional in
the nitrogen generator. As the nitrogen purity increases (above 98%) the
nitrogen production rate decreases (lower SCFH) and as the nitrogen
purity decreases (below 98%) the nitrogen production rate increases
(higher SCFH). Lower nitrogen production rates will increase system fill
times resulting longer run times of the nitrogen generator.
9. Verify and document the nitrogen production rate as indicated on the flow meter in the nitrogen
generator (See Maintenance Section for Nitrogen Production Flow Rate Procedure).
10. Close the nitrogen production flow meter isolation ball valve, allow the pressure to increase to
the nitrogen generator’s cut-out (turn-off) pressure and the nitrogen generator to shut off.
11. Once nitrogen generator has shutoff, monitor the pressure on the HMI display to ensure the
pressure indicated remains constant and does not decrease.
a. If pressure decreases, a leak within the nitrogen cabinet or in the nitrogen supply line exists,
leak check all piping and fittings within the nitrogen generator and repair leaks as necessary.
12. Open the regulated valve of all appropriate air maintenance device (AMD)’s and confirm the
“fast fill” valves of all appropriate air maintenance devices (AMD)’s are closed.
13. The nitrogen generator is ready to protect the fire sprinkler system(s).
NOTE: Once the nitrogen generator is operational and if the nitrogen generator experiences short
cycling issues, the short cycling is typically a result of an erratically operating air maintenance
device. (See Maintenance Section for Nitrogen Generator Short Cycling Prevention
Procedure).
Oxygen Removal Vent Setup and Pressure Regulator Adjustment Instructions
Once the nitrogen generator has been commissioned, the oxygen removal vents can be commissioned.
1. Install the appropriate restricted venting orifice in the oxygen removal vent by removing the vent
muffler downstream of the backpressure regulator, installing the restricted venting orifice and
re-installing the vent muffler.
a. The restricted venting orifice size is determined by the sprinkler system capacity (gallons).
b. Consult with ECS to ensure the appropriate restricted venting orifice is installed in the
appropriate oxygen removal vent.
2. Based on the nitrogen generator turn-on pressure and the sprinkler system low alarm pressure,
adjust the pressure setting for the backpressure regulator.
a. Choose a pressure setting for the backpressure regulator that is above the sprinkler system
low air alarm pressure and below the turn-on pressure of the nitrogen generator.
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