Page 65 - NG-1 1150, NG-1 1500, NG-1 2000, NG-1 3000 - Stand-Alone Nitrogen Generator System Installation Manual
P. 65

Step 6:
Step 7:
Allow the sprinkler system to fill with nitrogen while monitoring digital display of the pressure transducer in nitrogen generator.
• As pressure increases in sprinkler system and on the pressure transducer digital 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 transducer digital display will increase at a rapid pace
until the nitrogen generator turns off (cut-out pressure).
Compare the pressure indicated on the pressure transducer digital 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 pressure transducer digital 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 pressure transducer digital 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.
If the pressure on the sprinkler system’s air pressure gauge is LESS THAN the target operating pressure, increase the pressure setting of the AMD by 1⁄4 of a turn increment (cw) (increment can be different at discretion of operator) and return to Step 5.
If the pressure on the sprinkler system’s air pressure gauge is MORE THAN the target operating pressure, decrease the pressure setting of the AMD by 1⁄4 of a turn increment (ccw) (increment can be different at discretion of operator) and return to Step 4.
Repeat Steps 5, 6 and 7 to verify that the operating pressure readings are consistent.
• If the pressure reading is as expected, mark the location of the indicator on the sprinkler system air pressure gauge of the system being tested (and on the AMD pressure gauge if
applicable).
Other sprinkler systems not tested - If there is another system supplied by the nitrogen generator, proceed to that system and return to Step 2.
No other sprinkler systems to test - If there are no other systems supplied by the nitrogen generator to be tested, proceed to Step 11.
Test operation of nitrogen generator with all sprinkler systems operating.
• Confirm AMD fast fill (bypass) valve(s) are closed and the regulated valve(s) are open on
all the system AMD(s).
• Slowly drain 1-2 psi (.07-.14 bar) of pressure out of one (1) of the sprinkler systems.
• 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.
• Allow nitrogen generator to fill the sprinkler system(s) and turn-off.
Step 8a: Step 8b: Step 9:
Step 10a: Step 10b: Step 11:
TFP1275
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