20
Commissioning and Startup Procedure
Only qualified personnel should commission the new equipment into service once it is installed. Once the
nitrogen generator has been configured, there should be no reason to adjust the nitrogen generation
system.
Pre-Commissioning Information
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. Important - The nitrogen generator cut-in (turn-on) pressure is to be 3-5 psig (.2-.3 bar) below
sprinkler system the operating/AMD pressure.
2. Important - 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 (turn-off) pressure using the cut-out pressure adjustment procedure.
NOTE: When the AG-675 or AG-950 nitrogen generator is connected to a single sprinkler system
without an air maintenance device (AMD):
a. The nitrogen generator cut-out (turn-off) pressure be set to the sprinkler system
operating pressure.
b. The nitrogen generator cut-in (turn-on) pressure be set 3-5 psig (.2-.3 bar) below the
cut-out (turn-off) pressure.
Commissioning Nitrogen Generator
The nitrogen generator commissioning must be completed for the nitrogen generator to operate. See
Commissioning Section for procedure.
Start-Up Procedure
To start-up the generator or to put back in service, follow these steps:
NOTE: For component locations, see Maintenance Section for Generator Configuration Diagram.
1. Verify the air maintenance devices (AMD’s) have been set to the system operating or “high end”
breathing pressure.
a. If AG-675 or AG-950 nitrogen generator is connected to a single dry pipe or preaction
system and an AMD is not installed, verify the nitrogen generator cut-out (turn-off)
pressure is set at the sprinkler system supervisory gas operating pressure.
2. Important - Verify the nitrogen generator turn-on pressure is 3-5 psig (.2-.3 bar) below the air
maintenance device set pressure/sprinkler system supervisory gas operating pressure.
3. Important - Verify the nitrogen generator turn-on pressure is 3-5 psig (.2-.3 bar) above the
sprinkler system low air alarm set pressure.
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