Glow-worm Betacom 24, Installation And Servicing Manual

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Diagram 9.5
12929
Diagram 9.6
12977
Diagram 9.7
13018
9.5 Top Horizontal Rear fl ue - Standard
Part No. A2043400.
Refer to diagram 9.8 for kit contents.
9.6 Flue Length
If a wall thickness of 75 min. to 507 max. the Top horizontal rear
fl ue - standard can be used without extensions.
If the wall thickness is greater than 507 then using extensions
a maximum horizontal fl ue length of 4 metres (24kW) & 3 me-
tres (30kW) plus the top horizontal rear fl ue - standard can be
achieved. However, for every 90° or 45° elbows used the fl ue
length MUST be reduced by 1 metre.
When extension pipes are used the fl ue system must be de-
signed to have a continuous fall to the boiler of at least 44mm/
metre (2.5°) to allow condensate to run back into the boiler and
out via the drain.
Temporarily fi t the fl ue elbow, measure the distance from the
outside wall to fl ue elbow. If the measurement ‘Y’ exceeds
652mm, then the appropriate length of extension pipe is re-
quired. The minimum dimension is 187 to suit a 75 min. wall
thickness, see diagram 9.3.
9.7 Flue Fitting
Remove the fl ue elbow.
Separate the fl ue duct from the terminal by twisting to release
the terminal catch, then pull out of the retaining seal, refer to
diagram 9.9.
The fl ue duct cutting length (L + 11mm.) is shown in diagram
9.9.
The air duct should be cut at the opposite end to the terminal
The plastic fl ue duct MUST be cut at the opposite end to the
terminal catch.
The plastic fl ue duct extensions MUST be cut at the opposite
end to the seal.
Diagram 9.4
12979
9 Flue Preparation and Installation