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4 - FUNCTION OVERVIEW
the heating system the installer must
consider the head loss of the boiler
(see Figure 7-3) and the head loss of
the heating system to size adequate
pumps.
Boiler can be connected to a room
thermostat, Section 10.1.2.
An outdoor air temperature sensor
must also be connected to the boiler for
an outdoor reset supply temperature
control for maximum fuel effi ciency
and comfort (see Section 10.1.3). In
this confi guration the room thermostat
will compensate by adjusting the room
temperature.
The room temperature compensation
can be of an ON /OFF type. For further
information on the outdoor-air reset,
refer to Section 14.8.
The boiler must be connected to
an heating system with compatible
specifi cations, performance and
power rating.
4.1.2 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.
The water heater can be installed
with a Direct Venting system or with
a one pipe vent system and getting
combustion air from room.
The quality of the system water is
Figure 4-5 Outdoor reset control to optimize the effi ciency
4.1 - Intended use
and functions
4.1.1 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.
Follow the specifi c procedure in Section
14.6 for the adjustment of the domestic
hot water tempera ture.
The boiler version can be installed
with a Direct Venting system or with
a one pipe vent system and getting
combustion air from room.
The quality of the system water is
very important. Poor water quality can
damage heating systems and boilers
due to scale formation and corrosion.
The boiler version can be connected
to an indirect storage tank for the
production of domestic hot water
(Section 7.2.6).
Using the boiler version, you can
create a system with heating elements
functioning at temperature range
between 68°F (20°C) and 187°F (90°C)
can be confi gured.
The boiler version can also function
directly with a radiant fl oor panel.
When connecting the boiler version to
very important. Poor water quality can
damage the water heater due to scale
formation and corrosion.
This water heater must be connected
to a storage water heater for the
production of domestic hot water
(Section 8).
When connecting the water heater
to the storage water heater size the
correct circulator pump. The installer
must consider:
- the head loss of the water heater (see
Figure 7-3);
- the head loss of the piping system;
- the head loss of the storage water
heater;
- the water hardness be compatible with
the minimum water velocity;
The heater must be connected to
a domestic hot water supply with
compatible specifi cations, performance
and power rating.
4.2 - Effi ciency up 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 (see Section
14.8). It will automatically change the
supply temperature in relation with the
outdoor temperature (Outdoor reset).
The graph in Figure 4-5 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).
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