Page 49 - NG-1 1150, NG-1 1500, NG-1 2000, NG-1 3000 - Stand-Alone Nitrogen Generator System Installation Manual

9. The nitrogen purity was verified to be producing 98% nitrogen purity prior to equipment shipment from Johnson Controls. Should the purity not be 98%, contact Johnson Controls 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 1⁄8 turn increments (See Generator Configuration Diagram).
b. If nitrogen purity is below 98%, increase the nitrogen purity by turning the Nitrogen Flow Control Valve clockwise in 1⁄8 turn increments (See 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. Compare the documented nitrogen production rate with the nitrogen generator production rates in the Maintenance Section of this manual. (See 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 transducer digital display to ensure the pressure indicated remains constant and does not decrease.
a. If pressure decreases, a leak within the nitrogen cabinet exists, leak check all piping and fittings within the nitrogen generator and repair leaks as necessary.
13. Open nitrogen generator’s nitrogen outlet isolation ball valve and confirm the nitrogen supply line to the air maintenance device (AMD)’s does not contain any leaks, repair leaks as necessary.
14. Open the regulated valve of all appropriate air maintenance devices (AMDs) and confirm the “fast
fill” valves of all appropriate air maintenance devices (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 a result of an erratically operating air maintenance device. (See Maintenance Section for Nitrogen Generator Short Cycling Prevention Procedure).
Nitrogen Generator Leak Monitor Alarm
The nitrogen generator and air compressor are designed to run for up to two (2) hours at a time when filling all the systems with 3-5 psig (.2-.3 bar) of high purity nitrogen. If air compressor and nitrogen generator runtimes are greater than four (4) hours, the nitrogen generator activates an audible alarm and the leak monitor output contacts.
Verify the Leak Monitor Alarm is configured using the Nitrogen Generator Leak Monitor Adjustment Procedure in the Maintenance Section of this manual.
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