Page 44 - NG-1 100, NG-1 250, NG-1 500 - Wall-Mounted Nitrogen Generator System Installation Manual

Nitrogen Generator Pressure Adjustments
The nitrogen generator cut-in and cut-out pressure settings are established and set as part of the commissioning process of the nitrogen generator and do not need to be readjusted unless the fire sprinkler system parameters change. Any adjustments to the nitrogen generator cut-in and cut-out pressure settings will affect the TYCO TAV-D Vent or TSV-D SMART Vent backpressure regulator settings, which will require readjusting the backpressure regulators to coincide with the changes to the nitrogen generator cut-in and cut-out pressure settings.
NOTE: Any changes to the nitrogen generator cut-in and cut-out pressure settings or the vent backpressure regulator settings must be authorized by and under the direction of Johnson Controls.
1. Locate the Pressure Transducer in the nitrogen generator. (See Maintenance Section for Generator Configuration Diagram).
2. Adjust the nitrogen generator cut-in pressure. (See Maintenance Section for Nitrogen Generator Pressure Adjustment Procedure).
3. Adjust the nitrogen generator cut-out pressure, if needed. (See Maintenance Section for Nitrogen Generator Pressure Adjustment Procedure).
Nitrogen Generator Start Up and System Check Instructions
Once the cut-in and cut-out pressures have been determined and programmed into the Pressure Transducer, the nitrogen generator can be started to verify nitrogen production and nitrogen purity.
1. Verify the nitrogen generator is in the “nitrogen generation mode”.
2. Verify the “fast fill” valves of all appropriate air maintenance devices (AMDs) are closed.
3. Close the regulated valve of all appropriate air maintenance devices (AMDs).
4. Turn on the nitrogen generator (if nitrogen generator is not already on).
5. Partially open the nitrogen production flow meter isolation ball valve to automatically start the
nitrogen generator to generate nitrogen.
NOTE: The nitrogen generator incorporates an eight (8) second delay upon nitrogen generator
start for protection of the integral air compressor.
NOTE: Adjust the position of the flow meter isolation ball valve so that the pressure indicated on the Pressure Transducer is approximately 15-20 psig (1-1.4 bar) and remains constant between the nitrogen generator’s cut-in and cut-out pressures.
6. Allow the nitrogen generator to operate in the nitrogen production mode for approximately five (5) minutes to allow the nitrogen generator to obtain optimum operating temperature.
NOTE: Operating nitrogen generator with the door closed during initial start-up reduces time required for nitrogen generator to obtain optimum operating temperature.
7. Connect the Handheld Gas Analyzer to the quick connect gas sampling port in the nitrogen generator to verify the nitrogen purity is 98%.
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