17
5 If a rigid flue is used internally or externally,
it must be of the twin-wall type incorporating
seals at all joints, constructed with a stainless steel
inner skin and be suitably insulated and
weatherproofed. iQE recommends the use of the
G flue system components for this application.
Refer to Section 4.1 for details. The internal flue
diameter for a rigid flue for all models is 100 mm
(4 in).
Note: As no flue adaptor is supplied with the boiler
it will be necessary to purchase the iQE CF adaptor
kit (Ref. iQE CF15/35) in order to correctly
connect the G-system flue components to the
boiler.
If required, it is possible to use the white
painted single-wall straight flue extensions,
adjustable extensions and elbows from the iQE O-
system for the internal section of the flue
system, see Fig 10b. These components can be
fitted between the boiler connector and flue
adaptor. The flue adaptor, to which the
external twin-wall G-system components are
connected, can therefore be situated just before
the flue system passes through the wall. Note:
iQE O-system single-wall flue components must
not be used externally.
The maximum vertical height (from the top of the
boiler to the terminal) for the 100 mm diameter
G-system twin-wall flue is 8 metres.
6 Twin-wall flues are recommended for externally
run flues to reduce the possibility of the
condensate freezing in the flue.
7 No part of any flue system should be made of an
asbestos material; aluminium must not be
used in any part of the flue. Only stainless
steel flue components should be used.
8 If the draught conditions are satisfactory, the flue
should terminate with a standard cowl.
9 Refer to the locally applicable Building
Regulations, BS 5410:1 and OFTEC Installation
Requirements (Books 2 and 3) for further
guidance on conventional flue systems.
It is important to ensure that the flue system is
sealed and that condensate cannot escape. Up to
1.5 l/h of condensate can be produced in a
conventional flue system.
Only use flue systems suitable for oil fired
condensing boilers.
Do not use fire cement. The use of high temperature
silicone sealants is recommended.
4 - GENERAL BOILER INFORMATION
iQE O-System conventional flue
system - See Fig. 10a
A range of Flexible conventional flue lining kits
are available from iQE. The packs have been
specifically produced for iQE Horizon oil fired
condensing boilers.
Contents of iQE O-System flue pack
The pack includes a terminal/top plate/flexi flue
adaptor, stainless steel smooth bore flexible flue liner,
a rigid to flexi adaptor and a boiler flue connector.
Extensions
A range of white powder coated single wall
extensions are available to connect the boiler to
the flexible liner. The external diameter of the
extensions is 100 mm. Extensions are supplied
with locking bands.
Flue extensions cannot be cut.
An adjustable extension and 45° elbow are
also available. See Figs. 10a and 10b.
The rigid flue between the boiler and flexible flue
liner should incorporate an adjustable section to
allow inspection and cleaning of the flue system.
Part No.
iQEO6
iQEO8
iQEO10
iQEO11
iQEO12
iQEO14
iQEO16
iQE
O System
100mm dia. x 6 metre
100mm dia. x 8 metre
100mm dia. x 10 metre
100mm
dia.
x
11
metre
100mm
dia.
x
12
metre
Part No.
iQEOEX150
iQEOEX250
iQEOEX450
iQEOEX950
Extensions
for iQE
O
System
100 mm dia. x 150 mm
100 mm dia. x 250 mm
100 mm dia. x 450 mm
100 mm dia. x 950 mm
iQE Horizon Internal Oil Boiler
100mm dia x 14 metre
100mm dia x 16 metre
