Page 60 - NG-1 1150, NG-1 1500, NG-1 2000, NG-1 3000 - Stand-Alone Nitrogen Generator System Installation Manual

rate to the separation membrane must be held constant below the air compressor cut-out (turn-off) pressure to eliminate short cycling of the air compressor during the nitrogen production cycle. To prevent air compressor cycling, an excess air bleed-off assembly is included in the nitrogen generator. The excess air bleed-off assembly regulator is adjusted so that the air compressor operating pressure when running in the nitrogen production mode is below the cut-out pressure of the air compressor allowing the air compressor to operate continuously throughout the nitrogen production cycle.
1. If the air compressor’s air receiver tank pressure gauge and the excess air bleed-off regulator gauge, when operating, are more than 10-15 psig (.7-1 bar) below the cut-out (turn-off) pressure of the air compressor during nitrogen production cycle, decrease excess air bleed-off regulator (turn regulator clockwise). This raises the relief pressure of the regulator by exhausting less air thereby increasing the air compressor operating pressure resulting in increased nitrogen production.
2. If the air compressor is cycling during the nitrogen production cycle, increase excess air bleed-off regulator (turn regulator counter-clockwise) until the pressure gauge on the regulator is approximately 10-15 psig (.7-1 bar) below the cut-out (turn-off) pressure of the air compressor. This lowers the relief pressure of the regulator by exhausting more air thereby decreasing the air compressor operating pressure, resulting in sustained operation below the air compressor cut- out (turn-off) pressure thus eliminating the air compressor short cycling.
NITROGEN PURITY AND FLOW RATE
Nitrogen Purity Level Check Procedure
Nitrogen purity level in the fire sprinkler system can be checked by inserting the TYCO Handheld Gas Analyzer (THGA) into the nitrogen sampling port in the nitrogen generator cabinet or the gas sampling port on the TAV-D or TSV-D Vent.
1. Power On the THGA by depressing the power on button.
2. Calibrate the THGA by depressing and holding the calibration button for three (3) seconds until
“CAL” is displayed.
NOTE: To calibrate analyzer, unscrew sampling hose from analyzer and move back and forth until reading is displayed.
a. THGA must be recalibrated if nitrogen percentage displayed is above 80.1% or below 78.1% when reading normal atmosphere, not connected to the nitrogen generator cabinet or vent.
b. Recommended to recalibrate analyzer daily when in use.
3. Once the THGA is calibrated, insert the quick disconnect of the sampling hose into the sampling port in the nitrogen generator cabinet/vent.
NOTE: Nitrogen generator must be operating in “nitrogen production mode” to sample nitrogen in cabinet. Vent must be open to sprinkler system pressure to sample nitrogen in sprinkler system.
TFP1275
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