11
3 - FUNCTION OVERVIEW
Figure 3-1 Outdoor reset control to optimize the effi ciency
to 98% (IB boiler
only)
Section applicable to boiler version only.
When the outdoor reset is activated (an
outside sensor is connected), the boiler
always work at the maximum effi ciency.
It will automatically change the supply
temperature in relation with the outdoor
temperature (Outdoor reset).
The graph in Figure 3-1 shows an
example on how it can work.
This graph represents an installation
where the supply and return
temperatures are 139°F (60°C) and
115°F (46°C) respectively , and the
outside temperature is 23°F (-5°C).
The outdoor reset drives the boiler,
to progressively reduce the supply
temperature and thereby optimize the
effi ciency. It changes from 87% when
outside is -10°F (-23°C), to 94.8% when
outside is 23°F (-5°C) and up to 98%
when the outside temperature rises up
to 67°F (20°C).
3.1 - Intended use
and functions
3.1.1 Intended use and
functions of the IB boiler
The boiler version, is designed to be
used for central heating system for civil
uses. Any other use is prohibited.
The maximum output heat is always
guaranteed for the production of
domestic hot water since it is given
priority over space heating demands.
The boiler version can be connected
to an indirect storage tank for the
production of domestic hot water.
The boiler version can also function
directly with a radiant fl oor panel.
3.1.2 Intended use and
functions of the IW water
heater
The water heater version, is designed
to warm domestic water (potable) for
civil uses. Any other use is prohibited.
This water heater must be connected
to a storage water heater for the
production of domestic hot water.
3.2 - Effi ciency up
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