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9 Flue Preparation and Installation
9.1 Top Horizontal Rear fl ue - Telescopic
Part No. A2043600.
Refer to diagram 9.1 for kit contents.
9.2 Flue Length
If a wall thickness of 204mm min. to 409mm max. the Top hori-
zontal rear fl ue - telescopic can be used without extensions.
If the wall thickness is greater than 409mm then using exten-
sions a maximum horizontal fl ue length of 4 metres (24kW) &
3 metres (30kW) plus the Top horizontal rear fl ue - telescopic
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.
9.3 Preparation
Using these screws inserted into the same holes on the boiler,
tighten and secure the fl ue hood top, see diagram 9.3.
Temporarily fi t the fl ue elbow, measure the distance from the
outside wall to fl ue elbow. If the measurement ‘Y’ exceeds
525mm, see diagram 9.3, then the appropriate length of exten-
sion pipe is required. If the dimension is less than 320mm DO
NOT cut the fl ue, it can project beyond the outside wall face,
see diagram 9.4. If this is not desirable then a Top horizontal
rear fl ue - standard MUST be used and cut to length.
9.4 Flue Fitting
Set the fl ue to the required length ‘Y’, ensure the air duct seams
line up.
Remove the fl ue elbow.
Mark the securing hole position in the air duct. Drill a 3mm
diameter hole at this position, take care not to pierce the inner
fl ue duct. Secure with screw provided and tape the joint, see
diagram 9.5.
Fit the sealing collar onto the locating ring on the fl ue terminal,
see diagram 9.6.
Push the fl ue assembly into the wall, externally or internally,
until the end of the assembly protrudes a short way from the
inside face of the wall. This will enable the internal trim ring (if
required) to be positioned and allow the fl ue assembly to be
drawn back up to the fl ue elbow.
Secure the fl ue elbow in position on top of the boiler with four
torque headed screws supplied.
Draw the fl ue assembly from wall and engage the fl ue duct into
the elbow and butt fi t between the air duct and fl ue elbow.
Ensure the correct alignment of the fl ue.
Fit the securing collar in position, mark through two of the pre
drilled holes in the securing collar. Remove securing collar
and drill two 3mm diameter holes one in the elbow and one in
the air duct, take care not to pierce the inner fl ue duct. Fit the
securing collar and secure with screws provided, see diagram
9.7.
Slide the internal trim ring back against the wall, securing in
place with a small amount of sealant if required.
12925
Diagram 9.1
Diagram 9.3
12806
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