13
Installation
Installation can be only carried out by a qualified person. For the correct operation of the thermostatic, two
ways safety vent it is necessary to comply with the conditions for its installation and keep the flow directions
marking on its body. The safety vent is always mounted in the output pipe of boiler or directly on the upper
part of boiler, where the hot water leaves boiler and is transported into heating system. When installing the
vent it is necessary to check, if the 3/4“ socket usage, which can be both in pipeline and on boiler, ensures
complete immersion of the thermostatic vent element after the vent installation. After the vent has been
installed in socket, connect the down pipe, in which the hot water from boiler will flow to drain, to „C“(see. fig.
No. 6). The cooling water inlet, which will cool the boiler after setting the vent in operation, is connected (see
fig. No. 7) to „A“ (see fig. No. 6). The filter for mechanical impurities must be installed in the cooling water
inlet. It is necessary to connect the pipeline to „B“ (see. fig. No. 6) and the pipeline is to be led into reverse
flow pipe of heating system near the boiler (see fig. No. 7).
Regular maintenance
Once a year it is necessary to turn the safety vent’s head to remove possible impurities formed in the vent.
Clean the cooling water inlet filter.
In case of using an open expansion tank it is not necessary to use a protecting device against
overheating.
Every heat source in an open heat system must be connected with an open expansion tank positioned at the
highest point of the heat system. The expansion tanks must be rated in the way that they can contain the
changes in water volume resulting from heating and cooling.
The open expansion tanks must be equipped with non-closable bleeder and a overflow pipes. The overflow
pipe must be designed in the way that it safely drains off the maximum flow volume entering the system. This
can be achieved by rating the overflow pipes by one DN higher than that of the filling piping. The expansion
tanks and their connecting pipes must be designed and positioned in the way that freezing is reliably
inhibited.
Fig. no. 8
The examples of open expansion tanks connection
3.4
Superfluous heat removal equipment- storage reservoirs
In case that the required volume exceeds 300 l we recommend to install a storage reservoir.
Because the minimum output of this boiler is higher than 30% of the rated power we recommend to remove
the heat into the storage reservoirs.
The calculation of the minimum volume of stack heat exchanger
V
sp
= 15T
b
x Q
N
(1-0,3 x (Q
H
/Q
min
))
where
V
sp
the volume of storage reservoir in l
Q
N
rated thermal output in kW
T
b
burning time in h
Q
H
thermal load of buildings in kW
Q
min
minimum thermal output in kW
The dimensions of storage reservoirs at the boilers for central heating that are operated with individual
prescribed fuels must be set according to the fuel which needs the biggest storage reservoir. This storage
reservoir isn’t necessary if the calculated volume is smaller than 300 l.
1 Heat source
2 Expansion tank
3 Safety piping
4 Expansion piping
5 Overflow piping
6 Filling piping
7 Water level limiter
8 Reverse piping
