User manual HONEYWELL NK300

[. . . ] NK300 Refilling combination Product specification sheet Application The refilling combination serves filling and refilling of closed heating systems to DIN EN 12828:2003. It can be connected in accordance to EN 1717 constantly with the drinking water supply. The refilling combination combines backflow preventer, pressure reducing valve and two ball valves in one appliance. [. . . ] H h2 The backflow preventer is separated in three chambers (inlet, middle and outlet chamber). If no water is drawn from the downstream system, the backflow preventer is in normal position. The up- and downstream check valves and the discharge valve are closed. If water is drawn from the downstream system, the backflow preventer is in flow position. The check valves up- and downstream are opened and the discharge valve is closed. Ø50mm l1 L l2 The backflow preventer changes to shut-off position (back pressure) if the differential pressure between middle- and inlet chamber falls under 0. 14 bar. The check valves are closed and the discharge valve is opened. The pressure reducing valve reduces the pressure on the inlet side (admission pressure) to the level of the desired pressure on the outlet side (outlet pressure) in individual cases. R kg mm H h1 h2 L l1 l2 1 Connection size Weight Dimensions /2" 1. 4 236 74 162 232 59 114 The pressure reducing valve functions on a force equalisation principle. The force of a diaphragm operates against the spring force of the regulating valve. If the outlet pressure and therefore diaphragm force fall because water is drawn, then the greater force of the spring causes the valve to open. The outlet pressure then increases until the forces between the diaphragm and the spring are equal again. The inlet pressure (admission pressure) has no influence on the regulating valve of the pressure reducing valve. Inlet pressure fluctuation does not influence the outlet pressure, thus providing inlet pressure balancing. [. . . ] The included backflow preventer BA protects the potable water supply against back flow of heating water of liquid category 4 (with inhibitors) into service pipe. · · · · EN0H-1232GE23 R0506 Subject to change without notice www. honeywell. com 3 NK300 Refilling combination Spare Parts Refilling combination NK300 from 2006 onwards No. Description Cartridge insert complete Check valve Sealing set (10 pieces) Blanking plug with O-ring R1/4" (5 pcs. ) Pressure gauge 0 - 4 bar Dimension 1 Part No. 0903733 2166200 D06FA-1/2 0901443 S06K-1/4 M07M-A4 /2" /2" /2" 1 1 1 Replacement valve set /2" Automation and Control Solutions Honeywell GmbH Hardhofweg D-74821 Mosbach Phone: (49) 6261 810 Fax: (49) 6261 81309 http://europe. hbc. honeywell. com www. honeywell. com Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, Ecublens, Route du Bois 37, Switzerland by its Authorised Representative Honeywell GmbH EN0H-1232GE23 R0506 Subject to change © 2006 Honeywell GmbH [. . . ]