Example: In these EX models, the minimum flow rate required through the heat exchanger
is 18 or 21 gpm (depending on model) and a maximum of 100 gpm is allowed.
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 80°F).
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 flow.
To ensure adequate water flow 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 flow rate might drop below minimum requirements (18 or 21 gpm - depending on model).
For further information and details, consult our Concept Drawings – which provide detail on specific
single and multiple boiler applications “Piping”, “Wiring” and “Settings”. (available at
www.ibcboiler.com or from your IBC Representative).
Note
The piping drawings in this manual are simple schematic guides to a successful
installation. There are many necessary components not shown, and details such as
thermal traps are left out so the drawings have greater clarity. We require that our boilers
be installed by licensed and experienced trades people who are familiar with the
applicable local and national codes. System design is to be completed by an experienced
hydronic designer or Engineer. It is necessary to carefully read and follow these
installation instructions along with the application drawing that fits your system.
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