ELECTRA
C
OMFORT
30
is a graph for your basic orientation knowledge of
Minimal overpressure requested has to be signed on the
dependency.
thermomanometer by a responsible service person who is
The graph is determined for thermal drop 80/60 °C and
putting the boiler into operation. It is not allowed to drop
there are 3 curves with pressures of system in cold
the pressure of heating water below the margined signed
stage 0,5 and 1 and 2 bars.
on the thermomanometer. For right boiler and heating
In case that minimal volume requested of the expansion
system operation is necessary to control the overpressure
vessel is bigger than 8l, it is necessary to connect an
value sometimes and in case that the value is on
additional expansion vessel into the heating system to
requested value to fill the system on the overpressure
have volume of vessels counted bigger than minimal
value requested.
(according to the graph). In both expansion vessels there
are necessary to have a same pressure of nitrogen filling.
Filling overpressure of heating water
Curves are valid for using of safety valve set on 3 bars.
It is necessary to observe it in the case of the first filling or
also in the case of additional filling of minimal
Filling overpressure of expansion vessel
overpressure of heating water. The filling overpressure is
For right function of expansion vessel it is necessary to
about 0,20 bar higher than minimal overpressure
keep the overpressure of nitrogen filling, which is stated
requested from reason that the temperature of heating
for 1,2 x of the heating system overpressure in cold stage.
water during filling and additional filling has to be to 20° C
Pex = 1,2x Pov
(water is dilatable partially by this temperature).
Notice: gas filling adjustment of expansion vessel
3.7 Marking of working scale
has to be provided only by responsible service
On the pressure meter placed under the boiler there is
person to do it.
necessary to mark working scale that the pointer of
pressure meter is moving in. Maximal pressure is marked
Obligation for user is to assure the operation
†
by responsible person put the boiler into operation by
revision/control 1time per year and the pressure control
pressure meter marking.
of the built-in expansion vessel maximally 1 time per 9
Maximal margin = maximal overpressure of heating water
years, it means also of an additional expansion vessel if
in time of reaching of maximal temperature of heating
it is mounted to the heating system, only by responsible
water.
service person to do it.
3.8 Circle pump
Minimal overpressure of heating water
The boiler has circle pump with 3 output grades.
†
Value of minimal overpressure is stated in the table 1.5.
15
20
25
0
5
10
15
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.
m
in
im
a
l
v
o
lu
m
e
o
f
e
x
p
a
n
s
io
n
v
e
s
s
e
l
(l
)
volume of heating system (l)
pressure of heating system 0,5 bar
pressure of heating system 1 bar
pressure of heating system 2 bar.
Working features of the pump Grundfos Cesao 3
