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9. The nitrogen purity was verified to be producing 98% nitrogen purity prior to equipment shipment
from ECS. Should the purity not be 98%, contact ECS prior to making changes to the nitrogen
purity.
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 section 6.j., in the
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 section 6.j., in the 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.
10. Verify and document the nitrogen production rate as indicated on the flow meter in the nitrogen
generator (See section 6.d., in the Maintenance Section for Nitrogen Production Flow Rate
Procedure).
11. Close the nitrogen production flow meter isolation ball valve, allow the pressure to increase to
the nitrogen generator’s cut-out pressure and the nitrogen generator to shut off.
12. 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.
13. Open the nitrogen generator’s nitrogen outlet isolation ball valve and confirm the nitrogen supply
line to the AMDs does not contain any leaks, repair leaks as necessary.
14. Open the regulated valve of all appropriate AMDs and confirm the Fast Fill valves of all
appropriate AMDs are closed.
15. 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 section 6.e., in the 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 low air alarm
pressure and below the turn-on pressure of the nitrogen generator.
b. PAV-D/DQ Standard Vents:
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