Cortina S manuel Ver.01
13
CAUTION
For a new boiler installed on an old heating circuit
•
In old systems used for a long time, a protective coating (black magnetite)
has been built on all metal surfaces contact with water. This coating protects
the system agains further corrosion. When a mew boiler is installed in such
an old system, new parts with clean metal surfaces, particularly boiler
surfaces will inevitably become sacrificial anode for the entire heating
system, in other words, they come in the first place where corrosion starts.
That is why, following precautions should be added to those given above, for
a new boiler in an old system:
•
If the old system has an open expension tank, this may be converted to
pressurized system with all necessary safety measures.
•
The old system must be fully washed up from all substitutes and particules
contained on the surfaces.
•
An air separator with manual vent should be installed at the heighest level of
the circuit.
5.6 Chimney connection
Cortina boiler must be connected to an individual
chimney that will provide at least the minimum
draught given in the technical data of boiler. The flue
duct between the boiler and the chimney should be
insulated using a glass wool material. The flue duct to
chimney and chimney must be made of steel or an
equivalent material that can beresisting at
temperatures around 400
o
C. All connections on the
flue system must be sealed in order to perform a
good combustion and efficiency. The flue duct must
be connected to the 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.
