•
Boiler is quite strong against corrosion. However, all metal surfaces in heating circuit should
be protected against corrosion like pipes/radiators. The oxygen in heating water will cause
rust and then material loss on iron-based metal surfaces by means of oxidation.
•
During the first water make-up, oxygen must be fully discharged from the system. Generally,
oxidation will not be a problem, if all measures are taken into account during first water
make-up. Oxidation will take place because of fresh water addition to the system during
operation of the boiler. Leak points in a system will cause oxygen to be absorbed inside the
heating water. For this reason, minimum water pressure in a pressurized heating circuit
must be above atmospheric pressure. Besides, pressure levelshould always be checked
periodically.
5.6 Chimney connection
Cortina boiler must be connected to an
individual chimney that will provide at least the
minimum draught requested. Flue duct
between boiler and the chimney should be
insulated using a glass wool material. Flue
duct to chimney and chimney must be made of
steel or an equivalent material that can resist
temperatures up to 400
o
C. All connections on
flue system must be sealed in order to perform
a good combustion and efficiency. The flue
duct must be connected to chimney using the
shortest way and in accordance with the
dimensions given in the following scheme.
Horizontal connections and equipment that will
increase the pressure loss such as elbows
should be avoided. At the lowest level of
chimney, there should be a cleaning cover
which is made of steel, and sealed for any
leakage. The length of flue duct between the
boiler and the chimney should not exceed ¼
height of chimney. The size of flue duct and
chimney should not be less than the size of the
boiler flue gas outlet connection.
For the total height and the minimum internal diameter of the chimney, following diagram
should be referred in respect with boiler output power, if otherwise stated in mandatory
regulations.
