18
Grant Vortex Oil Boilers
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. The internal
flue diameter for a rigid flue for all models - up to and
including the 58/70 - is 100 mm (4 in).
Grant recommends the use of the Grant 'Green' flue
system components for this application. Refer to
Section 4.1 for details. Note: As no flue adaptor is
supplied with the boiler it will be necessary to
purchase the Grant CF adaptor kit (Ref. CFA15/70)
in order to correctly connect the 'Green' 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 Grant 'Orange' system
for the internal section of the flue system. These
components can be fitted between the boiler connector
and flue adaptor. The flue adaptor, to which the
external twin-wall 'Green' flue components are
connected, can therefore be situated just before the
flue system passes through the wall.
Note: Grant 'Orange' 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
'Green' 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
Part No.
GFKIT 6/100
GFKIT 6/125
GFKIT 8/100
GFKIT 8/125
GFKIT 10/100
GFKIT 10/125
GFKIT 11/100
GFKIT 11/125
GFKIT 12/100
GFKIT 12/125
GFKIT 14/100
GFKIT 14/125
GFKIT 16/100
GFKIT 16/125
Flexi Pack (Orange System)
100 mm dia. x 6 metre
125 mm dia. x 6 metre
100 mm dia. x 8 metre
125 mm dia. x 8 metre
100 mm dia. x 10 metre
125 mm dia. x 10 metre
100 mm dia. x 11 metre
125 mm dia. x 11 metre
100 mm dia. x 12 metre
125 mm dia. x 12 metre
100 mm dia. x 14 metre
125 mm dia. x 14 metre
100 mm dia. x 16 metre
125 mm dia. x 16 metre
Part No.
WX 150/100
WX 150/125
WX 250/100
WX 250/125
WX 450/100
WX 450/125
WX 950/100
WX 950/125
Extensions (Orange System)
100 mm dia. x 150 mm
125 mm dia. x 150 mm
100 mm dia. x 250 mm
125 mm dia. x 250 mm
100 mm dia. x 450 mm
125 mm dia. x 450 mm
100 mm dia. x 950 mm
125 mm dia. x 950 mm
Grant EZ-Fit Flexi Pack conventional flue system
(Orange System) - See Fig. 10
A range of Flexi pack conventional flue lining kits are
available from Grant UK. The packs have been
specifically produced for Grant Vortex oil fired
condensing boilers.
Contents of Grant EZ-Fit Flexi 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. Two diameters are
available, a 100 mm for models up to 46 kW and 125 mm
for models above 46 kW.
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 150 mm.
Extensions are supplied with locking bands.
Flue extensions cannot be cut.
An adjustable extension and 45° elbow are also
available. See Fig. 10.
The rigid flue between the boiler and flexible flue liner
should incorporate an adjustable section to allow
inspection and cleaning of the flue system.
