IBC INTERSTAR IWT Series, Installation & Operating Manual

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2.0 Pre-installation overview
Note
Local inspection authorities may not accept the indirect water heater due to jurisdictional
demands such as double-wall heat exchanger requirements, local, or state registration
requirements. Before installing the indirect water heater, you must check that local
authorities will accept this equipment.
2.1 Installation checklist
The following checklist will help with water heater, boiler, and circulator sizing.
Checklist Check
Water heater sizing Choose the water heater model based on the expected water
usage for the given site. The average residence with one
shower or more will require a Model 40 or larger. Factors that
increase water demand dramatically include high flow
shower heads, hot tubs, and the use of more than one
shower at a time. Increase the tank size if these factors are
present.
Carefully review the IBC water heater Specifications on
page 5 , and consult ASHRAE sizing guides and other
reliable references. Dimensions, weights, ratings, and
capacities are outlined in the Specifications tables (see
Table 1 and Table 2 ).
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Boiler sizing The water heater will provide the rated performance only if it
is used with a boiler with a heating capacity of at least as
much as the capacity ratings in
Table 1 and Table 2 . If the
boiler has less capacity, the water heating output will be
reduced.
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Circulator sizing Refer to Table 1 and Table 2 for the flow through the water
heater coil and the pressure drop at minimum flow. Calculate
the pressure drop across all piping and fittings connected to
the water heater zone. Be sure to include all zone valves,
check valves, and shut-off valves. We recommend piping
the water heater zone with minimum 1" pipe around the
entire loop on typical small residential sites.
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