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B
A
A - Boiler
B - Flue
C - Max. 2 bends at 135°
D - Anti down-draught terminal
E - Chimney
8
CONVENTIONAL FLUE
C
CONVENTIONAL FLUE
• Open (conventional) flued appliances must
• The flue system must be in accordance with
• The flue must be constructed of a material
D
E
• External flue systems must be of the
• Brick and masonry chimneys must be lined
• All flue joints must be sealed to prevent the
• Ensure that joints are made so that the
NOTE: The flue can be increased in size from
the boiler take off point providing the joint if
correctly sealed. Never reduce the flue
diameter from the boiler take off point.
CF SIZING:
12/18 and 18/25 = 100/103mmO (Dependent
on external diameter of flue system used)
25/32
Because the flue operates at a lower
temperature on a condensing boiler compared
to that of a conventional appliance, the flue
draught will be lower. Typically the draught will
be between 0.5mmwg and 4.5mmwg,
measured with the flue warm but the burner not
firing. The actual figure will vary depending on
weather conditions, flue height and position.
• The flue should be vertical and contain as
• The flue outlet must be extended beyond the
• Fit a suitable anti down draught terminal
Manufacturers of conventional flue systems
suitable for this appliance are listed under
'Contact Information' on the back cover.
GREENSTAR OILFIT INSTALLATION INSTRUCTIONS
not be installed in a bedroom, bathroom or
bedsitting room.
BS 5410 : Part 1 and the current Building
Regulations.
suitable for the use of condensing
combustion products.
insulated type.
with a suitablle non-combustable material
and properly jointed to withstand the effects
of the working temperature (minimum rating
of material 120°C) of the appliance and any
condensate which may form.
leakage of condensate and combustion
products.
condensate runs away and is not collected
within the joint.
= 130mmO
few bends as possible, a maximum of two
135° bends should be used.
eaves of the building and where possible
above the apex.
where down draughts are expected.
8 716 106 261b (01/07)
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