Wolf CGB-11 Installation Instructions Manual page 57

Flue gas temperature limiter
Connection to the balanced flue
Calculating the
balanced flue length
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Design information
The electronic flue gas temperature limiter switches the gas fired condensing boiler off
when the flue gas temperature exceeds 110 °C.
The boiler restarts when the reset button is pressed.
The rated boiler output in heating mode must be reduced to below 11 kW, if the gas
fired condensing boiler is installed with a balanced flue routed over an external wall (for
appropriate measures, see chapter „matching the maximum output" on page 24).
The clear cross-section of flues must be able to be inspected. Therefore, install an
inspection and/or test aperture inside the boiler room; agree suitable arrangements
with your local heating engineer.
Flue connections are created using couplings and gaskets. Always arrange couplings
against the condensate flow direction. Install the balanced flue with a slope of at
least 3° towards the gas fired condensing boiler. Install spacer clamps to secure
the location (see installation example).
The calculated length of the balanced flue system or the flue is derived from the straight
pipe length and the length of the pipe bends.
Example for a system comprising 60/100
Length of straight balanced flue 1.5 m
1 x 87° bend = 1.5 m
2 x 45° bends = 2 x 1.3 m
Note: To avoid the fresh air supply and flue gas exhaustion influencing each other
above the roof, we recommend you maintain a minimum clearance of 2.5 m
between the inlet and outlet.
Length equivalence of the system:
1)
1)
L = straight length + bend length
L = 1.5 m + 1 x 1.5 m + 2 x 1.3 m
L = 5.6 m
60/100
87°-bend 1,5 m
45°-bend 1,3 m
80/125
3 m
1,5 m
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