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6.2. Check before use
Before the boiler is set into operation it is important to check:
a) filling of the heating system with water
The water used for the filling of the heating system must be clear and
colourless, without suspended substances, oils and chemically aggressive
substances. The water hardness must satisfy the standard ČSN 07 7401:1992
and if the hardness of the water doesn’t conform to this standard the water
must be treated. Even the repeated warming of the water with higher water
hardness doesn’t improve the quality of water and doesn’t prevent the
appearance of salts at the surface of the heat-exchanger. The appearance of
the calc in the total thickness of 1mm reduces the exchange of heat
approximately by 10%.
The heating system with open expansion tank enables direct contact of the
heating water with the atmosphere. During the heating season the water in this
open expansion tank absorbs the oxygen which subsequently supports the
corrosive effect and at the same time the vaporisation of the heating water
increases. To make up for a loss of water it is recommended to use the treated
water acc. to the standard ČSN 07 7401:1992. Also it is important to rinse the
system to wash away all the impurities.
During the heating period it is important to keep the constant volume of water
in the heating system. During the refilling of the heating system with water the
entry of air in the system must be prevented. The water from the boiler and
from the heating system mustn’t be used for any other purpose and it is
recommended not to leak the water from the system with no serious reason
(repairs etc.). The empty system is more sensitive to corrosion and creation of
the scale.
The refilling of the water in the heating system is recommended only
when the boiler is cool. This prevents the damage of the steel heat-
exchanger.
b) tightness of the heating system
c) connection to the chimney must be approved by the chimney service
company
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