User manual HONEYWELL NK295S

[. . . ] Refilling combination Compact construction 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. [. . . ] 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. The backflow preventer change to shut-off position (back pressure) if the differential pressure between middle- and inlet chamber is smaller than 10% of the inlet pressure. The upstream non return valve is closed and the discharge valve is opened. There is no possibility to control the safety function by measuring. 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. 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. Designs NK295S-1/2A = Standard version with threaded connection R1/2" h1 H h2 ø 40mm l3 l2 L l1 l4 Connection size Weight Dimensions R ca. kg mm H h1 h2 L l1 l2 l3 l4 1/2" 1, 6 188, 5 67, 5 121 389 104 85 100 100 EN0H-1230GE23 R0405 2 Honeywell GmbH · Subject to change Refilling Combination NK295S Installation Example Installation Guidelines · Install in horizontal pipework with discharge connection directed downwards. [. . . ] welding beads, sealing materials, metal cuttings and rust. Typical Applications The refilling combination is priority suitable for domestic drinking water supply. The refilling combination can be used for commercial and industrial applications in consideration of its specifications. Below two typical applications: · automatic refilling of the heating system · automatic refilling of systems up to liquid category 3 in accordance with DIN EN 1717 Honeywell GmbH · Subject to change 3 EN0H-1230GE23 R0405 Refilling Combination NK295S Automation & Control Solutions Honeywell GmbH Phone: Hardhofweg Fax: D-74821 Mosbach EN0H-1230GE23 R0405 (49) 6261 810 (49) 6261 81309 www. honeywell. com 4 Honeywell GmbH · Subject to change [. . . ]