Slant/Fin VSL-160C Part A - Manuel (Page 13)

13
4 - FUNCTION OVERVIEW
a heating system with heating elements
functioning at temperatures ranging
between 68°F (20°C) and 176°F (80°C).
The boiler can also function directly with
a radiant fl oor panel, see section 7.2.
When connecting the boiler to the
heating system the installer must
consider the head loss of the heating
system to verify that the boiler pump
is adequate. Pump curve is shown in
Figure 7-3. The same verifi cation must
be done for the domestic installation,
see Figure 7-5.
160-B. Using this boiler model, you can
create a system with heating elements
functioning at temperatures ranging
between 68°F (20°C) and 176°F (80°C)
can be confi gured.
The boiler can also function directly with
a radiant fl oor panel, see section 7.2.
The 160-B model is not equipped
with the components required for the
production of domestic hot water. Also
not included is the expansion tank and
circulator pump, see Figure 4.2.
To connect the boiler to the heating
system, the installer must consider the
loss of pressure generated by the boiler
(see Figure 7-4), and choose a pump
capable of overcoming the head loss of
both the boiler and the heating system.
Figure 4-3 Outdoor reset control to optimize the effi ciency
4.1 - Intended use
and functions of the
boiler
This gas-fi red condensing boiler, is
designed to be used for central heating
and producing domestic hot water.
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
13.7 for the adjustment of the domestic
hot water temperature.
This boiler 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 due to scale
formation and corrosion.
This boiler can be connected to an
indirect storage tank for the production
of domestic hot water (Section 9).
Depending on the model choosen, the
following system types can be created:
160-C. Using this boiler model, you can
create a system for the production of
instantaneous domestic hot water and
160-C and 160-B models can be
connected to a room thermostat,
Section 8.1.3.
An outdoor air temperature sensor
can also be connected to the boiler for
an outdoor reset supply temperature
control for maximum fuel effi ciency
and comfort (see Section 8.1.4). 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 or two-stage. For further
information on the outdoor-air reset,
refer to Section 13.10.

The boiler must be connected to
a heating system and a domestic
hot water supply with compatible
specifi cations, performance and
power rating.
4.2 - Effi ciency up to
98%
When the outdoor reset is activated
(an outside sensor is connected), this
boiler is designed to always work at
the maximum effi ciency (see Section
13.10). It will automatically change the
supply temperature in relation with the
outdoor temperature (Outdoor reset).
The graph in Figure 4-3 shows an
example on how it can work.
This graph represents an installation
where the supply and return
temperatures are 139°F and 115°F
respectively , and the outside
temperature is 23°F. 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, to 94.8% when outside is 23°F
and up to 98% when the outside
temperature rises up to 67°F.