Buderus Logano plus GB312 Applications Manual page 14

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Limit curves
Fig. 2 Water treatment limit curv es for the various boiler sizes
The rule for V
max
Above the limit curve = water treatment necessary
Below the limit curve = no water treatment necessary
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(Units: 1ft = 7.48 gallon, 1ppm = 1mg/l, 1 grain/gal = 17.1 pm or mg/l)
USER NOTE
Any additives introduced into the heating
system water must be approved by the
manufacturer for use with aluminum boil-
ers.
When is water treatment necessary?
hardness (CaCO
is:
GB312 Applications Manual
) [ppm] or [mg/l]
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