Page 46 - NG-1 100, NG-1 250, NG-1 500 - Wall-Mounted Nitrogen Generator System Installation Manual

Oxygen Removal Vent Setup and Pressure Regulator Adjustment Instructions
Once the nitrogen generator has been commissioned, the oxygen removal vents can be commissioned.
1. Verify the vent assembly is equipped with a restricted venting orifice downstream of the backpressure regulator.
TFP1273
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2.
a. If the vent assembly is not equipped with a restricted venting orifice, please contact the Johnson Controls Technical Services team for your region.
Based on the nitrogen generator cut-in pressure and the sprinkler system low alarm pressure, adjust the pressure setting for the backpressure regulator.
a. b.
Choose a pressure setting for the backpressure regulator that is above the low air alarm pressure and below the turn-on pressure of the nitrogen generator.
TAV-D i.
ii.
iii. iv.
v.
vi.
vii.
Oxygen Removal Vents:
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.
Close the isolation ball valve and allow device to depressurize through the 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.
Push knob back into regulator until it clicks into place.
Once the TYCO Nitrogen Generator System has been commissioned, open the isolation ball valve on the vent assembly. The TYCO TAV-D Vent is now open and actively venting oxygen from the fire sprinkler system.
The isolation ball valve should remain open for approximately fourteen (14) days or until the system nitrogen concentration reaches 98% or greater.
NOTE: Use a TYCO Handheld Gas Analyzer to verify the gas concentration inside the fire sprinkler system.
At the conclusion of the fourteen (14) day DPNI process, close the isolation ball valve.
NOTE: Failure to close the isolation ball valve after fourteen (14) days or once fire sprinkler system nitrogen concentration reaches 98% will result in additional oxygen corrosion damage to the system and unnecessary run time of the air compressor and nitrogen generator.
If the sprinkler system actuates or another event introduces oxygen to the sprinkler system, the isolation ball valve must be opened again for a period of fourteen (14) days to vent oxygen from the system.