User manual HONEYWELL NK298S

[. . . ] NK298S Refilling combination Product specification sheet Application The refilling combination serves automatic filling and refilling from closed heating systems to DIN EN 12828:2003. The refilling combination can be connected in accordance to DIN EN 1717 constantly with the drinking water supply. The refilling combination combines backflow preventer, pressure reducing valve and ball valve in one appliance. [. . . ] The backflow preventer is a safety device in accordance with DIN EN 1717 to protect systems against back pressure, back flow and back syphonage of non-potable water into service pipe, plants and equipments. 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 non return valves and the discharge valve are closed. If water is drawn from the downstream system, the backflow preventer is in flow position. The non return valves up- and downstream are opened and the discharge valve is closed. ø 50mm h1 h2 l2 L l1 The backflow preventer change to shut-off position (back pressure) if the differential pressure between middle- and inlet chamber falls under 0. 14 bar. The upstream non return valve is 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. Connection size Weight Dimensions R approx. kg mm H h1 h2 L l1 l2 1/ 2" 2. 8 222 80 138 404 90 140 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. Options NK298S-1/2A= Standard version with threaded connection R1/2" Accessories TK295 Bar 3 2 1 4 5 6 7 8 9 10 Test kit Subject to change without notice EN0H-1229GE23 R0905 P Electronic pressure measuring device with digital indicator, runs by a battery. With case and accessories, ideal for inspection and maintenance of backflow preventer type BA. [. . . ] Description Cartride insert complete Non return valve 1 2 9 complete Replacement valve set (not incl. filter) Sealing set (10 pieces) Blanking plug with O-ring R1/4" 4 4 (5 pcs. ) Replacement filter in- 1/2" + 3/4" sert O-ring set Filter bowl Ball valve Manometer 1/ 1/ 1/ 2" 2" 2" 1 1 3 Dimension 3/ 4" Part No. 0903733 0903735 D06FA-1/2 0901443 S06K-1/4 /4" /2" + 3/4" /2" all ES06F-1/2A 0901246 SK06T-1/2 2192900 M07M-A4 + 3/4" + 3/ 4" 0 - 4 bar 9 3 5 4 3 10 6 7 8 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 Environment and Combustion Controls Division of Honeywell Technologies Sàrl, Ecublens, Route du Bois 37, Switzerland by its Authorised Representative Honeywell GmbH EN0H-1229GE25 R0805 Subject to change © 2005 Honeywell GmbH [. . . ]