12
Värmebaronen EK 15E
General
Installation must take place according to existing
rules and standards.
Heating systems can differ from one country to the
next due to climate, traditions and national regulations.
In cases where standards violate national regulations,
the latter must be followed. National and individual
requirements must be taken into account.
The electric flow heater must be located indoors
in a suitable location equipped with a floor drain.
The electric flow heater is mounted horizontally
so that the air that is released can circulate.
An system equipped with a closed expansion tank
must undergo an installation inspection prior to
first operation. The inspection must be carried out by
a person who is qualified for the task. The boiler or
expansion tank may not be replaced without another
inspection.
Valves must be fitted between the flow heater and
the heating system.
Cables and pipes must be laid so that it is possible
to open the front and remove the roof plate for service.
For installation and accessibility for service, there
must be at least 60 cm space above and in front of
the cartridge.
The electric flow heater is designed for non-
oxygenated water.
Water quality
Tap water is usually classified from the point of view
of hygiene. Good water classified on this basis is not
automatically suitable for a heating system. To avoid
problems a technical water analysis should take place.
Any nonconformities with standard values should be
corrected.
If the volume of the heating system is low, the boiler and
heating system may be filled with water that is not classified
as good boiler water. When the water is heated, some
oxygen and carbonic acid are emitted to the expansion tank
or vent valves. The remainder will react with the metals in
the system. This corrosion is often insignificant as the same
volume of water circulates and it soon becomes oxygen-free.
What is important is that the system is leak-proof so that
the water is not replaced with new oxygen rich water and
the water is not oxygenated during installation.
In large systems, it is impossible, in practice, to protect
against leaks and oxygen admission. In such cases,
an oxygen-consuming agent can be added so that there
is always a slight surplus in the system. These agents
often contain corrosion-limiting additives.
Suitable water line quality:
Alkalinity ≥ 60 mg / l to avoid corrosion.
Carbonic acid content > 25 mg / l increase the risk of
corrosion.
Sulphate contents > 100 mg / l may accelerate corrosion.
If the sulphate content is higher than the alkalinity, there
is a risk of copper corrosion.
Hard water causes boiler scale and is not suitable in
a heating system.
Very soft water may cause corrosion damage.
Chloride levels above 100 mg / l make the water aggressive,
especially together with lime deposits.
Low pH values may cause corrosion damage. The pH value
should be between 7.5 and 8.5.
The presence of carbonic acid in combination with low pH
and hardness values makes the water aggressive.
Flow requirements
The electric flow heater requires a constant adequate flow
to function properly. If the heating system's valves are able
to throttle circulation, an overflow valve must be installed.
The circulation pump must press the water through the
cartridge with the flow direction shown in the system
diagram.
Flow that is too low increases the difference between
the desired and the actual temperature, increases the risk
of that the overheating protection will be triggered and
the risk of irregular control resulting in increased wear
on the electromechanical components.
Excessive flow can result in vibrations in the immersion
heaters with noise and reduced service life as well as
unnecessary wear on system components.
Flow direction
The circulation pump must press the water through the boiler
with the flow direction shown in the System principles.
Expansion system
EK 15E must be connected to an expansion system.
Expansion vessels are dimensioned to accommodate changes
in water volume due to heating and cooling. Expansion
vessels, safety pipes, aeration and overflow pipes must
be installed in a manner that protects against freezing.
If the electric flow heater's safety pipe is not
connected to an open expansion vessel, it must
always be equipped with automatic venting.
Open system
The electric flow heater's flow / safety line must be
connected in an uninterrupted, uninterruptible pitch to an
expansion tank installed at the highest point of the heating
system. In order to avoid oxygenation of the heating system,
the distance between the top of the highest radiator and
expansion tank may not be less than 2.5 metres. To avoid
damage in the event of any blockage in the expansion
system, the electric flow heater should be fitted with
a safety valve.
