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INSTALLATION
SL 26-260 G3, SL 40-399 G3 MODULATING GAS BOILERS
Compared with the Primary/Secondary approach, the above design saves one pump. Lost
is the simplicity of constant head and ow at the boiler.
Check valves or thermal traps should be used to isolate both the supply and return piping
for each load - to avoid thermal siphoning and reverse ow.
To ensure adequate water ow through the boiler under high-head / single zone space
heating conditions, a pressure activated bypass or other means of bypass must be used
on any load where the ow rate might drop below minimum requirements (20 gpm).
For further information and details, consult our Application Notes – which provide detail on
specic single and multiple boiler applications “Piping”, “Wiring” and “Settings”. (available
at www.ibcboiler.com or from your IBC Representative).
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