Wolf CGB-75 Installation And Operating Instructions Manual page 50

Flue gas temperature limiter
The electronic flue gas temperature limiter switches the oil
condensing boiler off when the flue gas temperature exceeds
110 °C.
The appliance will restart operation when the
Note
rest button is pressed. It is important to find out
why the appliance deactivated before resetting
the boiler. Resetting the boiler when the flue
gas temperature is too high can destroy the
flue gas system.
Connection to the air/flue gas routing system
It must be possible to inspect the entire cross-section of the
flues. Therefore, install an appropriate cleaning and/or inspec-
tion port inside the boiler room; agree suitable arrangements
with the local flue gas inspector.
Flue connections are created using female connections and
gaskets. Always arrange female connections against the di-
rection of the condensate flow.
Install the air/flue gas routing system with a
slope of at least 3° (6 cm/m) towards the gas
condensing boiler. Install spacer clips to secure
in place (see installation examples).
In the worst case scenario, a lesser slope of the
air/flue gas routing system may lead to corro-
sion or operating faults.
Always bevel or deburr cut flues to ensure
Note
gas-tight installation of pipe joints. En-
sure that gaskets are fitted correctly. Re-
move all contamination prior to installation.
– never fit damaged parts.
For boilers with a rated heating output above 50 kW, a clear-
ance of at least 1.0 m between the flue outlet and the roof
surface is required.
50
28. Technical information
Calculating the balanced flue length
The calculated length of the air/flue gas routing system or
standard flue is derived from the straight pipe length and
the length of any pipe bends. In this calculation, a 87° bend
or a 87° tee is calculated as being 2 m and a 45° bend as
being 1 m.
Example:
Length of straight balanced flue 1.5 m
Inspection tee 87° = 2 m
2x 45° bends = 2x 1 m
L = 1.5 m + 1 x 2 m + 2 x 1 m
L = 5.5 m
Table: Pipe length calculation
Component Length to be allowed for
87° bend
45° bend
87° tee with
inspection port
Straight pipe Corresponding to length
2m
1m
2m
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