Page 29 - NG-1 1150, NG-1 1500, NG-1 2000, NG-1 3000 - Stand-Alone Nitrogen Generator System Installation Manual

Supervisory Gas Mode
Once the DPNI “fill and purge breathing” protocol is complete the nitrogen generator will automatically operate in the Supervisory Gas Mode. Whenever a fire sprinkler system needs supervisory gas the nitrogen generator and compressor will automatically operate.
• The vents no longer operate to depressurize the systems.
• When the sprinkler systems reach the low-end pressure, the nitrogen generator and compressor
will automatically turn on to increase the pressure in all fire sprinkler systems connected to the
nitrogen generator.
• Once the high-end pressure of the breathing cycle is reached the air compressor and nitrogen
generator will automatically turn off.
• It is important to remember that closing the vents will not affect the runtime of the air compressor
and nitrogen generator it will only affect the frequency of the runtime of the air compressor and nitrogen generator. 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, contact Johnson Controls.
Restart of the Nitrogen Inerting Process
Whenever the fire sprinkler system(s) are serviced and refilled with air, the TYCO DPNI protocol using the “fill and purge breathing” process must be reinitialized.
• TAV-D Vent:
o Open the manual vent isolation ball valve to begin the venting process.
o The isolation ball valve on the manual vent(s) will need to be closed after fourteen (14)
days to stop the Nitrogen Inerting Mode and begin the Supervisory Gas Mode.
• TSV-D SMART Vent:
o Depress the “Vent” button on the SMART Vent control box which energizes the solenoid on the SMART Vent to begin the venting process.
o The SMART Vent(s) will automatically close at the end of the fourteen (14) day inerting period and the nitrogen generator and compressor will automatically transition from the Nitrogen Inerting Mode to the Supervisory Gas Mode.
TFP1275
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