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e. Set the sprinkler system Low Air Alarm Pressure.
i. Press the pressure display, which displays a keypad.
ii. Enter the appropriate pressure, then press keypad “Enter” key.
6. Enter the installation location information into the HMI Screen (Recommended but not required).
a. Press the appropriate display, which displays a keyboard.
b. Enter the appropriate information, then press keypad “Enter” key.
7. Enter the Owner Contact information (Recommended but not required).
a. Press the appropriate display, which displays a keyboard.
b. Enter the appropriate information, then press keypad “Enter” key.
8. Press the “Finish” Button.
9. Enter the Service Contractor Contact information in the Information Settings Screen.
(Recommended but not required)
a. Press the appropriate display, which displays a keyboard.
b. Enter the appropriate information, then press keypad “Enter” key.
Sprinkler System Air Maintenance Device (AMD) Pressure
The proper operation of the nitrogen generator and the dry pipe nitrogen inerting (DPNI) process is
dependent on the sprinkler system’s air maintenance device (AMD) pressure setting. Sprinkler system
AMD pressure settings less than 3 psig (.2 bar) above the nitrogen generator cut-in (turn-on) pressure or
greater than 5 psig (.3 bar) above the nitrogen generator cut-in (turn-on) pressure will have an adverse
effect on the service life of the nitrogen generator.
Verify the AMD pressure setting using the Air Maintenance Device (AMD) Pressure Adjustment Procedure
in the Maintenance Section of this manual.
Nitrogen Generator Pressure Settings
Prior to setting the cut-in (turn-on) and cut-out (turn-off) pressures of the nitrogen generator, identify the
following sprinkler system pressures:
1. Sprinkler system operating pressure/Air Maintenance Device (AMD) pressure.
NOTE: When the nitrogen generator is connected to multiple dry pipe and preaction systems,
the fire sprinkler systems must operate at the same supervisory gas pressure.
2. Sprinkler system low air alarm pressure.
Once the sprinkler system pressures have been identified, determine the cut-in (turn-on) and cut-out
(turn-off) pressures of the nitrogen generator.
1. The nitrogen generator cut-in (turn-on) pressure is to be 3-5 psig (.2-.3 bar) below the sprinkler
system operating/AMD pressure.
2. The nitrogen generator cut-in (turn-on) pressure needs to be 3-5 psig (.2-.3 bar) above the
sprinkler system low air alarm pressure.
3. The nitrogen generator cut-out (turn-off) pressure is preset from the factory at 60 psig (4.1 bar)
which should be adequate for most applications. Should a higher cut-out (turn-off) pressure be
needed, adjust the cut-out pressure using the cut-out (turn-off) pressure adjustment procedure.
NOTE: If AG-675 or AG-975 is used on a single sprinkler system without an air maintenance
device (AMD), the nitrogen generator cut-out (turn-off) pressure is automatically set to
the sprinkler system operating pressure when No AMD is in use is selected.
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