Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 60

Commissioning, Inspection and Maintenance
Filling the Heating System
Total permissible hardness of the fill and top-up water
Total heating output
MBH
170
>170 to  682
>682 to 170
>2050
ppm - parts per million
gpg - grains per gallon
60
(continued)
Specific heating volume
<5 USG per 3412 BTU
300 ppm 17.5 gpg
200 ppm 11.7 gpg
150 ppm 8.8 gpg
2 ppm 0.11 gpg
Vitoligno 300-C Installation/Service
Water quality
Treatment for boiler feed water should be considered in
areas of known problems, such as where a high mineral
content and hardness exist. In areas where freezing might
occur, an antifreeze may be added to the system water
to protect the system. Please adhere to the specifications
given by the antifreeze manufacturer.
Do not use automotive silicate based antifreeze.
Please observe that an antifreeze/water mixture may
require a backflow preventer within the automatic water
feed and influence components such as diaphragm
expansion tanks, radiation, etc. Maximum antifreeze
content is 50% for the Vitoligno 300-C boiler. Do not
use antifreeze other than specifically made for hot water
heating systems. System also may contain components
which might be negatively affected by antifreeze.
Check total system frequently when filled with antifreeze.
Advise system operator/ultimate owner that system is
filled with a glycol mix. The heating contractor must
provide a MSDS (Material Safety Data Sheet) for the
antifreeze used to the system operator/ultimate owner.

5 USG per 3412 BTU to
<13 USG per 3412 BTU
200 ppm 11.7 gpg
150 ppm 8.8 gpg
2 ppm 0.11 gpg
2 ppm 0.11 gpg

13 USG per 3412 BTU
2 ppm 0.11 gpg
2 ppm 0.11 gpg
2 ppm 0.11 gpg
2 ppm 0.11 gpg