Potter NAMD Nitrogen Air Maintenance Device

Features Designed for use with nitrogen generators and air compressors Assembled in USA using corrosion resistant components No power required for operation Provided with a corrosion resistant mesh screen 50 or 60 mesh prevent the entry of particles into the regulator and sprinkler Manual bypass to allow quick filling of sprinkler systems after or maintenance Nitrogen Air Maintenance Device NAMD is a field adjustable regulating device used to keep nitrogen or air pressure at the level in dry pipe and preaction fire sprinkler systems It can also used to control pressure in dry pilot line systems of dry pilot actuated or preaction valves NAMD is used in sprinkler systems with an automatically compressed nitrogen or air source that is at a pressure higher required for proper system operation These sources can include generators and air compressors dedicated to the fire sprinkler and air or nitrogen systems The NAMD includes a bypass that after sprinkler system maintenance or operation quick filling of the sprinkler system Specifications 140 1.6 60 and up to 99 humidity Sprinkler NFPA 13 80 psi 0 5.52 bar 70 psi 0.34 4.83 bar Temperature Use Gauge Pressure Range Inlet Pressure 200 psi 13.79 bar Fig 2 lbs subject to change without notice page 1 OF 4 Air Maintenance Device5403713 REV A 1 19Potter Electric Signal Company LLC St Louis MO Phone 800 325 3936 www pottersignal comfirealarmresources com NAMD must be installed between the nitrogen or air supply and the sprinkler system each sprinkler system must have a dependable nitrogen or supply capable of filling the system within 30 minutes in accordance with NFPA standards The NAMD should be installed in an accessible location permit periodic inspection and field adjustment accordance with NFPA standards each sprinkler system is required to have its own dedicated air maintenance device the NAMD in the appropriate location between the automatic nitrogen or air supply and sprinkler system The NAMD must be installed in proper orientation with the sprinkler system being downstream of the regulator and the nitrogen or air supply upstream of the regulator The NAMD must be installed in the orientation shown in Fig 1 so the cap of the strainer faces down Determine the minimum pressure required for the sprinkler system Close the regulator inlet ball valve regulator outlet ball valve and bypass ball valve Turn on the automatic nitrogen or air supply Do not pressurize the sprinkler system above the set pressure of the regulator The regulator is factory set to approximately 40 psi If the system pressure is different see page 3 for field adjustment instructions Open the bypass ball valve and fill system to 5 psi below operating pressure Once it reaches desired pressure close the bypass ball valve Open the regulator inlet ball valve and check to make sure regulator is set at 40 psi or your desired sprinkler system pressure Open the regulator outlet ball valve and allow the sprinkler system to slowly pressurize to the desired pressure The NAMD is now operational 1 CONNECTION is shown in Bypass position CONNECTION PAGe 2 OF 4 REV A 1 19Potter Electric Signal Company LLC St Louis MO Phone 800 325 3936 www pottersignal comNAMDNitrogen Air Maintenance Devicefirealarmresources com NAMD operates by keeping the sprinkler system pressure at the proper level required for normal sprinkler system operation The correct pressure is provided by the manufacturer of the dry pipe preaction or deluge valve When small leaks occur in the sprinkler system the NAMD allows amounts of nitrogen or air into the system to keep it at the required minimum pressure When the sprinkler system operates in a fire situation the loss of pressure overcomes the NAMD ability to replace the lost nitrogen or air through a 3 32 restrictor orifice allowing the valve to open intended Adjustment of Pressure Settings ensure that all ball valves are in closed position Pull up on the adjustment knob of the regulator until it snaps into adjustment position and open the regulator inlet ball valve To increase sprinkler system pressure turn the adjustment knob of the regulator clockwise until the desired pressure is achieved To reduce sprinkler system pressure turn the adjustment knob counterclockwise to at least 5 psi lower than desired pressure Then adjust clockwise desired pressure Always approach the desired pressure from a lower pressure to avoid minor readjustment after making a change in pressure setting Once the correct sprinkler system pressure has been set push the adjustment knob down until in snaps into the locked position Open the bypass ball valve and fill to 5 psi below operating pressure Once it reaches desired pressure close the bypass valve Open the regulator inlet ball valve and check to make sure regulator is set at the desired sprinkler system pressure Open the regulator outlet valve and allow the sprinkler system to slowly pressurize to the desired pressure The NAMD is now operational inspection and testing as required by NFPA 25 is recommended The NAMD should be inspected and tested in accordance with the following Verify that the regulator ball valves are in the open position and that the bypass ball valve is closed ensure that the NAMD is set to the correct sprinkler system pressure See Field Adjustment of Pressure Settings The strainer should be inspected and cleaned as needed at least annually To remove the screen first close both regulator ball valves Remove screen and empty any loose material then flush with clean water If necessary use a wire brush to remove any particles trapped in the screen the strainer screen making sure that the cap is securely tightened and open both regulator ball valves all ball valves are closed the nitrogen air supply is disconnected from the sprinkler system Care shall be taken to ensure the sprinkler system not activate due to loss of nitrogen air pressure while the strainer is being cleaned page 3 OF 4 REV A 1 19Potter Electric Signal Company LLC St Louis MO Phone 800 325 3936 www pottersignal comNAMDNitrogen Air Maintenance Devicefirealarmresources com 2 Information air Maintenance Device No page 4 OF 4 REV A 1 19Potter Electric Signal Company LLC St Louis MO Phone 800 325 3936 www pottersignal comNAMDNitrogen Air Maintenance Devicefirealarmresources com