24
10.
Flue gas and air supply
10.1
Individual or common flue systems
The Strebel S-CB
+
/ PX 120 cascade sets can be equipped with individual or common flue systems.
Using separate flue systems is always preferred above common flue systems. Only when separate flue
systems can’t be used, one should choose to use a common flue system.
When chosen for an individual flue system each boiler has its individual flue gas outlet and air supply lines to
the outside of the building. This may be executed in
parallel
or
concentric
flue gas and air supply pipes.
When chosen for a common flue system this must be executed in
parallel
flue gas and air supply pipes.
10.2
Individual flue systems
Individual flue systems can be chosen as mentioned in the S-CB
+
instruction manual.
The flue system should comply with the chapter
“Flue gas and air supply system”
of the
Strebel
S-CB
+
/ S-CB PX manual.
For each boiler, the combined resistance of the individual flue gas and air inlet pipe can be calculated and
checked with the maximum for the gas-side resistance.
Resistance table and example calculations are given in the same forementioned chapter of the S-CB
+
manual.
Please note: Using this kit does not determine the spacings between exhaust terminals and air intake
terminals.
Please refer to the relevant British Standards:
BS 6644 – Installation of gas fired hot water boilers of rated inputs between 70kW – 1.8MW.
Please refer to the Instition of Gas Engineers and Manager Documents (IGEM):
IGEM/UP/10 Edition 4 – Installation of gas fired hot water boilers of rated inputs between 70kW – 20MW.
10.3
Common flue systems
Common flue systems must be designed according to:
EN 13384-2 “Chimney – Thermal and fluid dynamic calculation methods – Part 2: Chimneys serving more
than one heating appliance.”
Strebel Ltd Technical can advise on what software can be used for doing these calculations. Do not attempt
to design common vent systems without the appropriate software and training.
For common flue gas systems, the parameter P5DB has to be adjusted to prevent recirculation of flue gases.
Содержание S-CB 100
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