Buderus Logano plus GB312 Applications Manual page 14

1 4 |
Limit curves
As an alternative to calculation, the Vmax fi gure may be
taken from the following graphs.
2000
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
0
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
3
(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?
• If the quantity of fi ll water actually needed is less than
Vmax, untreated water may be introduced.
• If the quantity of fi ll water actually needed is more than
Vmax, water treatment is necessary.
• To reduce the amount of scale, the two approved additives
Noble Company Noburst AL and Rhomar RhoGard may be
used (this products are also used as antifreeze). They can
reduce the amount of scale introduced by the fi ll water by
50% and 60% respectively.
• Do not use water from salt bedding type exchangers (ion
exchanger) used to soften water.
Technical specifi cations are subject to change without prior notice
50 100 150 200
hardness (CaCO
is:
250 300 350 400
) [ppm] or [mg/l]
3
GB312 Applications Manual
450 500 550
7 747 010 722-01.1RS
Logano plus GB312 applications manual | 04.2008