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Nitrogen Generator Pressure Adjustments
The nitrogen generator cut-in (turn-on) and cut-out (turn-off) 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 (turn-on) and
cut-out (turn-off) pressure settings will affect the Standard Vent (PAV-D/DQ) or SMART Vent (PSV-D/DE)
backpressure regulator settings, which will require readjusting the backpressure regulators to coincide
with the changes to the nitrogen generator cut-in (turn-on) and cut-out (turn-off) pressure settings.
NOTE: Any changes to the nitrogen generator cut-in (turn-on) and cut-out (turn-off) pressure settings
or the vent backpressure regulator settings must be authorized by and under the direction of
ECS.
1. Nitrogen generator pressure adjustments are accomplished through the HMI display.
2. Adjust the nitrogen generator cut-in (turn-on) pressure. (See section 6.g., in the Maintenance
Section for Nitrogen Generator Pressure Adjustment Procedure).
3. Adjust the nitrogen generator cut-out (turn-off) pressure, if needed. (See section 6.g., in the
Maintenance Section for Nitrogen Generator Pressure Adjustment 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 HMI displays a leak monitor
alarm, activates an audible alarm and activates the common trouble output contacts.
Nitrogen Generator Start Up and System Check Instructions
Once the nitrogen generator has been programmed through the HMI, 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 (AMD)s are closed.
3. Close the regulated valve of all appropriate AMDs.
4. Turn on the nitrogen generator (if nitrogen generator is not already on).
5. Close nitrogen outlet valve on nitrogen generator.
6. Open the nitrogen production flow meter isolation ball valve to automatically start the nitrogen
generator to generate nitrogen.
7. 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: Air compressor must remain running continuously during the nitrogen generation cycle.
If the air compressor cycles during the nitrogen generation cycle or an excessive amount
of air is being exhausted from the excess air regulator muffler, the excess air regulator in
the nitrogen generator may require adjustment. (See section 6.c., in the Maintenance
Section for Excess Air Adjustment Procedure.)
8. Connect the Handheld Gas Analyzer to the quick connect gas sampling port in the nitrogen
generator to verify the nitrogen purity is 98%.
NOTE: Prior to connecting the Handheld Gas Analyzer to the nitrogen generator, calibrate the
Handheld Gas Analyzer using the calibration procedures. (See section 6.d., in the
Maintenance Section for Nitrogen Purity Check Procedure.)
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