Autotrol 255 / LOGIX 740, Operation Manual, Page: 17 / 92

255 Blending Valve Kit
Kit (P/N 1239760) for the 255/700 series includes :
- Nut (10-32) and Adjusting scew
Installation
Insert the nut into the Blending Valve orifice located near the Bypass Flapper shown below.
Insert the screw through the top plate and then through the nut (Figure A).
Tighten the screw until it touches the Bypass Flapper (Fig. B).
Operation
Tightening the adjusting screw will force the Bypass Flapper open. The open Flapper will
allow untreated (hard) water to blend with the treated water supply. As the adjusting
screw is turned in, the hardness of the oulet water increases (Fig. C).
Loosening the adjusting screw will allow the Bypass Flapper to close. The closing action
will blend less untreated water into the oulet flow.
To blend a specific amount of hardness into outflow, adjust the screw and test the water.
Repeat the procedure as needed until the desired hardness level is reached.
Figure A
Figure B
Figure C Figure D
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3031985 15/04/09 11:40 Page 17