Page 28 - NG-1 100, NG-1 250, NG-1 500 - Wall-Mounted Nitrogen Generator System Installation Manual
P. 28

3. Inspection of the vent assembly should be performed after installation and hydrostatic testing of the fire sprinkler system. Inspection should be performed periodically thereafter in accordance with the applicable national codes, NFPA codes and standards, and/or the authority having jurisdiction.
NOTE: Inspection must include the condition of the in-line filter and checking for blockage in the “Y” strainer and the restricted venting orifice.
Operating Instructions
1. Verify the vent assembly has been equipped with a restricted venting orifice downstream of the backpressure regulator.
NOTE: If the vent assembly is not equipped with a restricted venting orifice, please contact Johnson Controls. The restricted venting orifice must be installed before proceeding with the steps below.
2. Determine the low air alarm pressure and the turn-on pressure of the nitrogen generator.
3. Choose a pressure setting for the backpressure regulator that is above the low air alarm pressure but below the turn-on pressure of the nitrogen generator.
4. 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.
5. Close the ball valve and allow device to depressurize through restricted venting orifice to pressure setting. Make adjustment to pressure setting using the knob, then open ball valve to pressurize device and close 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.
6. Push knob back into regulator until it clicks into place.
7. 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. It should remain open for approximately 14 days or less, until the system nitrogen concentration reaches 98% or greater. Use a TYCO Handheld Gas Analyzer to verify the gas concentration inside the fire sprinkler system.
8. Close the isolation ball valve. Failure to close the manual ball valve after fourteen (14) days or less, 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.
9. If the sprinkler system actuates or another event introduces oxygen to the sprinkler system the manual ball valve must be opened again for a period of fourteen (14) days to vent oxygen from the system.
TFP1273 Page 27 of 80

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