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F
2.17
IG
IMPORTANT!!!
W
HERE CONDENSE WILL FORM WITHIN THE FLUE SYSTEM
ENSURE THERE IS A FALL BACK TO THE BOILER OF
SUITABLE TRAP IS FITTED AS CLOSE TO THE BOILER AS
. MTS
POSSIBLE
SUPPLY A SUITABLE COLLECTOR
705798
OR A CONDENSATE DISCHARGE
P
N
. 705774.
ART
O
F
2.18
IG
F
2.19
IG
and the air intake must not be sited above the exhaust
terminal (refer to F
run horizontally, however, the terminal and the final 1
metre of flue must be installed with a fall away from the
boiler to avoid rain ingress.
It is also strongly recommended that the air intake pipe
run be constructed of insulated pipe to prevent condense
forming on the outside of the tube.
The maximum permissible flue length for twin flue is
dependent on the type of run used.
For flue runs with the intake and exhaust pipes under the
same atmospheric conditions (T
length is 60 metres (28kW), 46 metres (28kW) and 47
metres (31kW). For runs with the terminals under
different atmospheric conditions (T
terminal must extend 0.5 metres above the ridge of the
,
roof (this is not obligatory if the exhaust and air intake
3
O
AND A
pipes are located on the same side of the building). For
T
P
N
.
ART
O
59 metres (24kW), 48 metres (28kW) and 42 metres
T
WITH BUILT IN TRAP
(31kW). Flue types are shown on Page 16 (F
The maximum length is reached by combining the total
lengths of both the air intake and exhaust pipes.
Therefore a maximum length of 40 metres for example,
will allow a flue run of 20 metres for the air intake and 20
metres for the exhaust pipes, also for each 90
metres must be subtracted from the total length and for
each 45
flue length.
Some of the acceptable flue configurations are detailed
on page 16 (F
For further information relating to flue runs not illustrated,
please contact the Technical Department on 01494
539579.
. 2.21). The air intake pipe can be
IG
5 also, the maximum permissible combined length is
YPE
o
elbow 1 metre must be subtracted from the total
. 2.20).
IG
4) the maximum
YPE
5) the exhaust
YPE
. 2.20).
IG
o
elbow 1.3
15
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