Page 66 - NG-1 1150, NG-1 1500, NG-1 2000, NG-1 3000 - Stand-Alone Nitrogen Generator System Installation Manual
P. 66

Step 12:
Step 13: Step 14:
Step 15: Step 16:
• Compare sprinkler system pressures on all systems are the same as the target operating pressure.
• If system pressures are NOT the same as the target operating pressure, repeat Step 8, as necessary.
• If system pressures are the same as the target operating pressure, proceed to Step 12. Determine the nitrogen generator cut-in (turn-on) pressure by subtracting 5 psig (.3 bar) from the target system operating pressure determined at the beginning of this procedure.
• If subtracting 5 psig (.3 bar) from the target operating pressure results in a cut-in (turn-on)
pressure that is within 3 psig (.2 bar) of the low air alarm, subtract 3 psig (.2 bar) from the
target operating pressure.
• If subtracting 3 psig (.2 bar) from the target operating pressure results in a pressure that is
within 3 psig (.2 bar) of the low air alarm, contact Johnson Controls for direction. Program the cut-in (turn-on) pressure into the digital pressure transducer in the nitrogen generator (Use the Nitrogen Generator Pressure Adjustment Procedure in the Maintenance Section of this manual).
Slowly depressurize the sprinkler system(s) individually to the cut-in (turn-on) pressure where the generator turns on and verify:
• The pressure setting on the AMD and sprinkler system air pressure gauge when the
nitrogen generator turns on.
• That a low air alarm is not received on any fire sprinkler system supplied by the nitrogen
generator prior to the nitrogen generator turning on.
• The nitrogen generator fills the sprinkler system(s) to the appropriate operating pressure
and then turns off.
Confirm all AMD fast fill (bypass) valve(s) are closed and the regulated valve(s) are open on all the system AMD(s).
Open all valves to the accelerators on the sprinkler systems (if installed).
END OF PROCEDURE
TFP1275
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