Glow-worm Betacom C - Manual (Page 29)

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Diagram 9.18
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9 Vertical Flue - Length, Preparation and Installation
9.11 Vertical flue
The vertical flue system is available as an option where the
boiler position does not permit the use of the top horizontal
flue system.
The system is made up from accessories. The accessories
include terminal assembly, bends 45º and 90º, flue
extensions, fixing bracket and appropriate weather collar,see
diagram 9.19.
The maximum permitted straight flue length is 6,8 metres for
Betacom 24C, 5,8 metres for Betacom 30C.
for each 90º or 2x45º bends fitted, the maximum length
must be reduced by 1 metre, see diagram 9.18.
NOTE: 2x45º bends can replace 1x90º bend if necessary.
When using 90º bends any horizontal extension pipe should
be inclined by a minimum of 44mm/metre (2.5º) towards the
boiler to facilitate condense removal, see (a) in diagram 9.18.
Alternatively use 45º bends to avoid horizontal runs, see (b)
in diagram 9.18.
The terminal siting should be as shown in diagram 4.2.
Measure the distance of flue length required for the
installation.
The flue must be designed with a continuous fall towards the
boiler.
The maximum permitted straight flue length
is 6,8 metres for Betacom 24C, 5,8 metres
for Betacom 30C, for each 90°or 45°x2
bends fitted, the maximum length must be
reduced by 1 metre.
w
w
E
1
E
1
E
2
E
2
Maximum flue (calculated equivalent) length
w, x, y, z, E
1
and E
2
should be less than 6.8 m for
Betacom 24c, 5.8 m for Betacom 30c