IBC VFC 15-150 Installation And Operating Instructions Manual page 28

WARNING
Water quality has a significant
impact on the lifetime and
performance of an IBC Boiler
heat exchanger.
Improperly prepared water in
a heating circuit may cause
damage to the heat exchanger
through corrosion or fouling.
Repeated or uncontrolled water
fills will increase the potential
for damage.
High levels of dissolved solids
or minerals may precipitate
out of the fluid onto the hottest
part of the heat exchanger,
impairing heat transfer and
resulting in overheating and
premature failure. The amount
of solids that may form on the
heat exchanger will depend
on the degree of hardness and
the total water volume in the
system. A high water volume
system with a low hardness
count may cause as much
damage as a system with less
volume and higher hardness, so
it is recommended to treat water
so as to remove all dissolved
solids. Other water chemistry
allowable limits are as follows:
Acidity pH is to be between 6.6
and 8.5
Chloride is to be less than 125
mg/l
Iron is to be less than 0.3 mg/l
Cu less than 0.1 mg/l
Conductivity is to be less than
400μS/cm (at 25°C)
Hardness is to be 7 Grains or
less
IMPORTANT: Ensure that these
limits are acceptable for the
other water-side components in
the system.
1-22
VFC 15-150, VFC 45-225 MODULATING GAS BOILERS
The VFC modulating series boilers are designed to supply up to four different
heating loads with temperatures within the range 34°F to 185°F - to meet three
separately piped loads. Use closely spaced tees to connect each pumped "load"
(e.g. DHW, baseboards or radiant floor) to the primary loop, or employ the use
of a hydraulic separator to isolate the boiler loop from the system and pipe the
system from the secondary side of the separator.
A variety of application drawings showing basic design options are available from
the IBC web site at: www.ibcboiler.com
Figure 26: Primary/Secondary piping concept with hydraulic separator
Figure 27: Important Primary/Secondary piping details with hydraulic separator
Always ensure that loads sensitive to high temperatures are protected using
means such as an aquastat (wired to the boiler's auxiliary interlocks) or mixing
valve set for maximum limit (say 140°F) to protect radiant floors.
INSTALLATION AND OPERATION INSTRUCTIONS