INSTALLATION AND OPERATION INSTRUCTIONS
1-20
VFC 15-150 - VFC 45-225 MODULATING GAS BOILERS
Do not place any water connections overhead the boiler;
leaks can damage
the fan & controls. if needed, create a shield over the louvered top of the cover,
but allow clearance for airflow and service access.
For best results, use a
Primary: Secondary
piping system, with a pumped
boiler loop using 1-1/4" piping for the 15-150 and 1 1/2” for the 45-225. Heat
exchanger head for both models is approx. 7' at 14 gpm, and 12’ at 22 gpm
so an inexpensive fractional horsepower pump is normally adequate. Primary/
Secondary piping ensures adequate flow and de-couples Δ°T issues (boiler vs.
distribution). Aim for a 20° to 30° F Δ°T across the heat exchanger at high fire
(there is a boiler protection throttle fence limiting the Δ°T to 35°F).
WARNING
Close fill valve after any
addition of water to the
system, to reduce risk of
water escapement.
NOTE
Full sized application
drawings can be downloaded
from our web site.
www.ibcboiler.com
Table 5 - pump sizing - deleted; consult IBC Shop drawing information
Figure 22: Basic Primary/Secondary piping concept
Figure 23: Important Primary/Secondary piping details
Summary of Contents for VFC 15-150
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