18
19
Heating system
Rated diameters of pipes are determined
in the usual manner, depending on the
pump characteristic curve. The piping is
determined by the requirements for the
system in question, not by the boiler’s
maximum power output. Nevertheless, the
piping must provide for a 20°C temperature
difference between the incoming and
outgoing CH and the minimum fl ow rate
500 litres per hour.
The pipes’ layout must be such that no
bubbles form in the system and purging
is facilitated. Purging valves should be
situated at all high points of the system and
on each radiator. It is absolutely necessary
to fl ush the system before the new boiler
installation and remove impurities from
heating system.
The heating system’s hydraulic pressure
(measured at the boiler) should be at least
1 bar (corresponding to 10 m of water
column). The recommended pressure
range is from 1 to 2 bar. The expansion
vessel is suitable for max.70 litres of
heating water (for temperature 80°C).
Thermostatic valve heads can be used on
the radiators. If the boiler is controlled by
a room thermostat, the ther mo stat ic valve
heads should not be installed in the room
where the room thermostat is.
The boiler may be connected to the heating
circuit by fl exible elements (hoses) during
reconstructions, if necessary because of
the layout, etc. Such hoses must have
parameters suitable for the purpose,
should be as short as possible, protected
from damages caused by mechanical load
and chemical agents, and replacement
must always be arranged prior to the
end of the life-cycle and/or deterioration
of their parameters (according to their
manufacturer’s instructions).
Note:
after connecting of boiler to heating
system remove plastic stoppers which are
placed in boiler outlets.
DHW system
The DHW pressure should be between 1
an 6 bars; if it is higher, a reduction valve
must be installed. In areas with very hard
water, suitable measures for softening
should be applied.
It is recommended to install CH, DHW
and gas stop valves on the pipes near
the boiler.
For easy connecting of boiler is used the
special connecting set with stop valves
(see Fig. 10).
Boiler installation
Boiler hanging
The boiler is hung on the wall on two bolts,
with minimum diameter of 6 mm. Suitable
washers must be placed under the bolt
heads. The connecting fi ttings have outer
threads. All necessary distances are shown
in the figure of connecting dimensions
(fi g.8).
Boiler connecting
It is recommended to install CH, DHW
and gas stop valves on the pipes near
the boiler.
The connection fittings on the boiler
must not be affected by any pressures or
forces from the piping – in other words,
all dimensions and distances of the
connected pipes must be accurate, both
mutually and from the wall and fl oor. For
this end is supplied special connecting set
(see Fig. 10).
On the hydraulic set at the boiler’s bottom,
the following elements are situated: safety
valve, relief valve and discharge valve.
The boiler should be connected to the
heating system such that it is possible to
discharge water only from the boiler if it is
necessary for repairs.
Boiler hanging
fi g. 11
