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3.4. Flue gas pipework connection to boiler
Important : The boiler(s) must not carry the weight of the flue assembly
The flue offtake from the boiler should include
a tapping to allow analysis of the combustion
gases.
To ensure correct readings, the offtakes should
have the lengths 'F' and 'L', as shown on the
adjacent drawing.
3.5. Conventional flue arrangement B23 and B23P
When fitting B23 and B23P, it is essential the
minimum dimension 'A' is observed. This allowes space
to adapt the flue to give a pressure at the boiler outlet of 0 Pa
The flue assembly must be resistant to condensate and
capable of withstanding temperatures up to 120°C
The VF boiler will have very low outlet temperatures;
consequently, to encourage lift of the flue gases and draining
of the ondensate, the flue pipework should slope upwards at
an incline of 3°C. In addition, to avoid leakage, the joints
should be sealed tightly using soapy liquid or an
appropriate grease.
adapter air filter
c
d
e
+5
0
+5
0
VF 60 100
Ø ext
80 100
F
125 135
L
160 170
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