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The graph is determined for thermal drop 80/60 °C and
there are 3 curves with pressures of system in cold
stage 0,5 and 1 and 2 bars.
In case that minimal volume requested of the expansion
vessel is bigger than 8l, it is necessary to connect an
additional expansion vessel into the heating system to
have volume of vessels counted bigger than minimal
(according to the graph). In both expansion vessels there
are necessary to have a same pressure of nitrogen filling.
Curves are valid for using of safety valve set on 3 bars.
Filling overpressure of expansion vessel
For right function of expansion vessel it is necessary to
keep the overpressure of nitrogen filling, which is stated
for 1,2 x of the heating system overpressure in cold stage.
Pex = 1,2x Pov
Notice: gas filling adjustment of expansion vessel
has to be provided only by responsible service
person to do it.
Obligation for user is to assure the operation
revision/control 1time per year and the pressure control
of the built-in expansion vessel maximally 1 time per 9
years, it means also of an additional expansion vessel if
it is mounted to the heating system, only by responsible
service person to do it.
Minimal overpressure of heating water
Value of minimal overpressure is stated in the table 1.5.
Minimal overpressure requested has to be signed on the
thermomanometer by a responsible service person who is
putting the boiler into operation. It is not allowed to drop
the pressure of heating water below the margined signed
on the thermomanometer. For right boiler and heating
system operation is necessary to control the overpressure
value sometimes and in case that the value is on
requested value to fill the system on the overpressure
value requested.
Filling overpressure of heating water
It is necessary to observe it in the case of the first filling or
also in the case of additional filling of minimal
overpressure of heating water. The filling overpressure is
about 0,20 bar higher than minimal overpressure
requested from reason that the temperature of heating
water during filling and additional filling has to be to 20° C
(water is dilatable partially by this temperature).
3.7 Marking of working scale
On the pressure meter placed under the boiler there is
necessary to mark working scale that the pointer of
pressure meter is moving in. Maximal pressure is marked
by responsible person put the boiler into operation by
pressure meter marking.
Maximal margin = maximal overpressure of heating water
in time of reaching of maximal temperature of heating
water.
3.8 Circle pump
The boiler is equipped with powerful circulation pump
which modulate of RPM to reduce the consumption of
electricity.
The pump operation is controlled by the control unit
15
20
25
0
5
10
40 60 80 100 120 140 160 180 200
Graph Dependency of expansion vessel volume on volume of heating system for thermal drop 80/60 °C.
minimal volume of expansion vessel (l)
volume of heating system (l)
pressure of heating
system 0,5 bar
pressure of heating
system 2 bar
pressure of heatingpressure of heating
system 1 barsystem 1 bar
pressure of heating
system 1 bar
Pump with internal control
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