Page 51 - NG-1 1150, NG-1 1500, NG-1 2000, NG-1 3000 - Stand-Alone Nitrogen Generator System Installation Manual
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as follows: mode set to ‘E’, scale set to ‘20, 30, 40, 50, 60’, range set to ‘10h’, and timer knob set to ‘35’. If needed, a small flathead screwdriver can be used to adjust the timer settings.
NOTE: The green power switch on the electric control box must be in the ON position and the orange VENT button depressed with both the green power switch and the orange VENT button illuminated to adjust the vent pressure regulator.
ii. Pull the knob out from the regulator to adjust pressure setting. Turn the knob clockwise to raise the pressure, counter-clockwise to lower the pressure.
iii. Close the isolation ball valve and allow device to depressurize through restricted venting orifice to pressure setting. Make adjustment to pressure setting using the knob, then open the isolation ball valve to pressurize device and close the isolation ball valve again to check pressure setting. Repeat process until desired pressure setting is achieved.
NOTE: This process can only be performed when fire sprinkler system is at normal operating pressure.
iv. Push knob back into regulator until it clicks into place.
v. Once the TYCO Nitrogen Generator System has been commissioned, open the
isolation ball valve on the vent assembly, turn the green power switch on the electric control box to the ON position and push the orange VENT button. The button should now be illuminated.
vi. The TYCO SMART Dry Vent is now open and actively venting oxygen from the fire sprinkler system. It will remain open for approximately fourteen (14) days.
vii. At the conclusion of the oxygen venting cycle, the orange VENT button will extinguish and the vent will automatically close.
viii. If the sprinkler system actuates or another event introduces oxygen to the sprinkler system press the orange VENT button to automatically restart the oxygen venting cycle.
Using Nitrogen Generators with Low Pressure Valves
When connecting a TYCO nitrogen generator to a low-pressure valve, additional considerations need to be evaluated. Due to the inherent operating pressures (i.e. 20 psi / 1.4 bar or below), the operational tolerances are tighter which reduces the pressure range for the “fill and purge” pressure cycling to operate.
1. Typical trip pressure for low-pressure valve is 7 psi (0.48 bar).
2. Typical low air alarm pressure for low pressure valve is 10 psi (0.69 bar).
3. Typical operating pressure for a low-pressure valve is 13 psi (0.9 bar) minimum and 18 psi (1.24
bar) maximum.
Based on this information, the “fill and purge” breathing cycle needs to be reduced to a 3-psi breathing range and determine the vent orifice size based on a 3-psi (0.21 bar) breathing range.
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