8
Fig. №. 8
Examples of connection of opened expansion tanks
3.4
Heat Removal Device - Accumulating Tanks
Boilers of Hercules E68 series meet - according to EN-305 - conditions of the emission class 5. It matches the requirements of this class while
being operated with the nominal power.
If the nominal power is higher than the immediate request of the facility for heating, it is necessary to exhaust the excessive heat into the
accumulating tank.
If the tank is fully charged, it is necessary to shut down the boiler and heat up with heat from the accumulating tank. After the heat in the tank is
spent, put the boiler into operation again. The accumulating tank enables you to ensure thermal comfort and at the same time a quality
operation of the boiler.
Calculation of the smallest volume of the tank heat-exchanger.
V
sp
= 15T
b
x Q
N
(1-0,3 x (Q
H
/Q
min
))
where:
V
sp
accumulation tank volume in l
Q
N
nominal heating power in kW
T
b
combustion time in hours
Q
H
thermal load of buildings in kW
Q
min
smallest heating power in kW
Dimensions of the accumulating tank must be determined according to the boiler power and used fuel. It is necessary to consider the highest
calculated volume, whereas the minimal used volume of the accumulating tank has to be 300 l.
The hydraulic scheme of connection of the boilers with the accumulating tanks are available in the project supporting documents of Viadrus,
at http://www.viadrus.cz/projekcni-podklady-76.html.
4
Positioning and installation
4.1
Regulations and directives
A solid fuel boiler may be only installed by a company with a valid authorization to perform its installation and maintenance. A project according
to the valid regulations must be prepared for installation. Before installation of the boiler in an old heating system, installation companies have to
perform rinsing (cleaning-up) of the whole system.
The heating system has to be filled up with water, which complies with requirements
of ČSN 07 7401, and mainly its hardness mustn't exceed the required parameters.
Tab. №. 4
Recommended values
Hardness
mmol/l
1
Ca
2+
mmol/l
0.3
concentration of total Fe + Mn
mg/l
(0,3)*
*) recommended values
WARNING!!! The manufacturer doesn't recommend using of antifreeze mixtures.
In case of triggering the two-way safety devi
ce, when water which does not comply with requirements of ČSN 077401 can be refilled, it
is necessary to prepare water in the system so that it met the requirements of this standard.
a) for the heating system
ČSN 06 0310
Heat systems in buildings
– Design and mounting
ČSN 06 0830
Heat systems in buildings
– Securing devices
ČSN 07 7401
Water and steam for heat energetic equipment with steam operation pressure up to 8 MPa
ČSN EN 303-5
Boilers for central heating - Part 5: Solid fuel boilers for central heating, with manual and automatic supply, with
nominal heating power at most of 500 kW
– Terminology, requirements, testing and marking.
b) for the chimney
ČSN 73 4201
Design of chimneys and flue gas ducts
– Design, fulfillment and connection of fuel consumers
c) regarding to fire-fighting regulations
ČSN 06 1008
Fire safety of heat equipment.
ČSN EN 13501 -1 + A1
Fire classification of building products and building structures
– Part 1: Classification according to results of
tests for reaction to fire.
d) for the hot water heating system
ČSN 06 0320
Heat systems in buildings
– Preparation of hot water – Development and design
ČSN 06 0830
Heat systems in buildings
– Securing devices
ČSN 75 5409
Indoor water distributions
1.
Heat source
2.
Expansion tank
3.
Safety pipeline
4.
Expansion pipeline
5.
Overflow pipeline
6.
Feeding pipeline
7.
Water lever limiter
8.
Return pipeline
