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Step 4: 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.
Step 5: Set nitrogen generator to bypass (air only mode) and fast fill sprinkler system with air to
3-5 psig (.2-.3 bar) below operating pressure.
Step 6: Change nitrogen generator to nitrogen mode, open the AMD inlet/outlet (regulated) valves,
close AMD fast fill (bypass) valve and complete filling of sprinkler system.
Step 7: When sprinkler system air pressure gauge reaches desired system operating pressure:
• Slowly decrease AMD regulator pressure (turn counter-clockwise) until pressure indicated
on HMI transitions from steady pressure to climbing pressure, the AMD regulator should
be properly set.
Step 8: Verify AMD operating with nitrogen generator using AMD Operation with nitrogen generator
verification procedure.
Step 9: Repeat Steps 4 thru 8 for each additional AMD connected to the nitrogen generator.
AMD Operation with Nitrogen Generator - Verification
Step 1: Systems not being checked - Close the all AMD valves.
Step 2: System being checked - Verify the AMD fast fill (bypass) valve is closed and the inlet/outlet
(regulated) valves are open.
Step 3: Set the cut-in (turn-on) pressure of the nitrogen generator to 3-5 psig (.2-.3 bar) below the
sprinkler system AMD set pressure. (See Maintenance Section for the Nitrogen Generator
Pressure Adjustment Procedure).
Step 4: Slowly drain 3-5 psi (.2-.3 bar) of pressure out of the sprinkler system.
Step 5: Use the flow meter ball valve to relieve gas from nitrogen/air supply line to sprinkler system
AMD’s allowing the nitrogen generator to turn on.
Step 6: Allow the sprinkler system to fill with nitrogen while monitoring the pressure on the HMI LCD
display in the nitrogen generator.
• As pressure increases in sprinkler system and on the HMI LCD display (through the AMD),
the pressure increase will be gradual.
• When the sprinkler system operating pressure reaches the AMD set pressure and the
AMD closes:
o The pressure on the sprinkler system air gauge will stop rising.
o The pressure on the pressure HMI LCD display will increase at a rapid pace until the
nitrogen generator turns off (cut-out) pressure.
Step 7: Compare the pressure indicated on the HMI LCD display at the transition (gradual increase to
rapid increase) with the pressure indicated on the system air pressure gauges.
NOTE: The pressure indicated on the HMI LCD display at the transition of gradual to rapid
increase will be the pressure at which the AMD pressure regulation device is currently
set.
• If the pressure indicated on the HMI LCD display at the transition (gradual increase to
rapid increase) is the sprinkler system’s target pressure, proceed to Step 9.
• If the pressure indicated on the sprinkler system’s air pressure gauge at the transition
(gradual increase to rapid increase) is LESS THAN the sprinkler system’s target pressure,
proceed to Step 8a.
• If the pressure indicated on the sprinkler system’s air pressure gauge at the transition
(gradual increase to rapid increase) is MORE THAN the sprinkler system’s target pressure,
proceed to Step 8b.
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