Page 64 - NG-1 1150, NG-1 1500, NG-1 2000, NG-1 3000 - Stand-Alone Nitrogen Generator System Installation Manual

2. Inlet pressure fluctuations to the AMD resulting in pressure fluctuations of the AMD.
3. Interaction between AMDs when multiple sprinkler systems are connected to a single nitrogen
generator.
NOTES:
Step 1: Step 2: Step 3:
Step 4:
Step 5:
Step 6: Step 7:
Close the valves to all accelerators on the sprinkler systems (if installed).
Systems not being checked - Close the all AMD valves.
System being checked - Verify the AMD fast fill (bypass) valve is closed and the inlet/outlet (regulated) valves are open.
Temporarily set the cut-in (turn-on) pressure of the nitrogen generator to 15 psig (1 bar) below the cut-out (turn-off) pressure of the nitrogen generator. (Use the Nitrogen Generator Pressure Adjustment Procedure in the Maintenance Section of this manual).
Use the flow meter ball valve to relieve gas from nitrogen/air supply line to sprinkler system’s AMD allowing the nitrogen generator to cycle on and off.
System being checked - Adjust the AMD to the predetermined set pressure.
Repeat Steps 4, 5 and 6 for each additional AMD connected to the nitrogen generator.
• 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.
• Any changes to the AMD pressure settings must be correlated with the nitrogen generator cut-in (turn-on) and cut-out (turn-off) pressure settings; and be authorized by and under the direction of Johnson Controls.
• Accuracy of pressure gauges typically used in the fire sprinkler industry can vary as much as 8-12 psi (.6-.8 bar) (See Operational Information - Sprinkler System Gauge Accuracy).
Determine the operating pressure for all AMDs connected to a single nitrogen generator. The operating pressure must be the same for all AMDs.
NOTE: AMDs operating at different operating pressures will have an adverse effect on the operation and can reduce the service life of the nitrogen generator.
Initial Setting of AMDs
AMD Operation with Nitrogen Generator - Verification
Step 1: Step 2:
Step 3:
Step 4: Step 5:
Systems not being checked - Close the all AMD valves.
System being checked - Verify the AMD fast fill (bypass) valve is closed and the inlet/outlet (regulated) valves are open.
Set the cut-in (turn-on) pressure of the nitrogen generator to 3-5 psig (.2-.3 bar) below the AMD set pressure. (Use the Nitrogen Generator Pressure Adjustment Procedure in the Maintenance Section of this manual).
Slowly drain 3-5 psi (.2-.3 bar) of pressure out of the sprinkler system.
Use the flow meter ball valve to relieve gas from nitrogen/air supply line to sprinkler system AMDs allowing the nitrogen generator to turn on.
TFP1275
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