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Retrofittable control unit for a softening apparatus

  • US 20110132818A1
  • Filed: 07/09/2009
  • Published: 06/09/2011
  • Est. Priority Date: 08/09/2008
  • Status: Active Grant
First Claim
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1. Control unit (1, 1a) for a softening device (2), wherein the control unit (1, 1a) comprisesa primary inlet (4) for untreated water,a primary outlet (7) for blended water,a sensor for determining the water hardness of the untreated water Wraw or the blended water WHblend,a secondary outlet (15) which is supplied with untreated water from the primary inlet (4),a secondary inlet (6) which is supplied to the primary outlet (7),a bypass line (9) which is guided parallel to the secondary outlet and the secondary inlet (6),a blender which can be automatically adjusted for mixing a blended water flow Vblend(t) from a first partial flow V(t)part1soft of the secondary inlet (6) and a second partial flow V(t)part2raw of the bypass line (9),an electronic control means (11, 11a), wherein the control means (11, 11a) is designed to readjust the adjustment position of the blender according to of the determined water hardness WHraw or WHblend in such a fashion that the water hardness in the blended water flow Vblend(t) is adjusted to a predetermined desired value, whereinthe control unit (1, 1a) is designed in the form of an external control unit (1, 1a) for the softening device (2), wherein the control unit (1, 1a) has a control unit housing (3), the outer side of which is provided with the primary inlet (4), the primary outlet (7), the secondary outlet (5) and the secondary inlet (6), and wherein the control unit housing (3) contains the sensor, the bypass line (9), the blender and the electronic control means (11, 11a).

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