If an existing chimney is to be used, it must be lined with a smooth
bore stainless steel liner suitable for use with oil fired condensing
boilers. The top and bottom of the annular space must be sealed.
Grant recommends the use of the Grant ‘Orange’ flue system,
specifically designed for the Vortex range of condensing boilers.
The internal flue and liner diameter for all models up to 46 kW
output must be 100 mm (4 in) and for the 46/58 and 58/70 models
125 mm (5 in).
The maximum vertical height (from the top of the boiler to the
terminal) for the ‘Orange’ system is 19 metres.
! NOtE !
The Grant Orange system flexible stainless steel liner
is directional. the arrows marked on the liner mUSt be
pointing vertically upwards, following the direction of the
flue gases. Failure to comply with this instruction could
lead to a leakage of condensate from the flue liner.
If a rigid flue is used 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). Use the larger ‘200’ size of
‘Green’ system components as listed in Figure 9-14.
Grant recommends the use of the Grant ‘Green’ and ‘Orange’ flue
system components for this application. Refer to Section 1.3 for
details.
! NOtE !
As no flue adaptor is supplied with the boiler, in order to
correctly connect the hybrid system, it will be necessary
to purchase the Grant CF adaptor kit (product code:
CFa15/70).
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, see Figure 9-6. 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 hybrid ‘Green/Yellow’ system is
8 metres.
Grant ‘Green’ twin-wall flue is recommended for externally run
flues to reduce the possibility of the condensate freezing in the
flue.
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.
If the draught conditions are satisfactory, the flue should terminate
with a standard cowl.
Refer to the locally applicable Building Regulations, BS 5410:1
and OFTEC Installation Requirements (OFTEC Technical Books 2
and 4) for further guidance on conventional flue systems.
! CaUtiON !
Caution concerning likely damage to equipment or tools
as a consequence of not following the instructions in the
caution.
Only use flue systems suitable for oil fired condensing boilers.
Do not use fire cement. The use of high temperature silicone
sealants is recommended.
! NOtE !
to comply with the requirements of the Building
Regulations Approved Document J - conventional flue
systems must have a flue data plate. A suitable data plate
is supplied with the Grant Orange flue system and should
be displayed next to the boiler or flue.
FLUE LiNiNG KitS
Grant EZ-Fit Flexi Pack conventional flue system (Orange
System)
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.
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.
table 9-4:
Conventional flue kits
Product code
Flexi pack (Orange system)
GFKIT 6/100
100 mm diameter x 6 metre
GFKIT 6/125
125 mm diameter x 6 metre
GFKIT 8/100
100mm diameter x 8 metre
GFKIT 8/125
125mm diameter x 8 metre
GFKIT 10/100
100mm diameter x 10 metre
GFKIT 10/125
125mm diameter x 10 metre
GFKIT 11/100
100mm diameter x 11 metre
GFKIT 11/125
125mm diameter x 11 metre
GFKIT 12/100
100mm diameter x 12 metre
GFKIT 12/125
125mm diameter x 12 metre
GFKIT 14/100
100mm diameter x 14 metre
GFKIT 14/125
125mm diameter x 14 metre
GFKIT 16/100
100mm diameter x 16 metre
GFKIT 16/125
125mm diameter x 16 metre
Extensions
A range of white powder coated single wall extensions are
available to connect the boiler to the flexible liner.
The nominal diameter of the extensions is 100 mm or 125 mm.
Extensions are supplied with locking bands.
table 9-5:
Extensions
Product code
Extensions (Orange system)
WX 150/100
100 mm diameter x 150 mm
WX 150/125
125 mm diameter x 150 mm
WX 250/100
100 mm diameter x 250 mm
WX 250/125
125 mm diameter x 250 mm
WX 450/100
100 mm diameter x 450 mm
WX 450/125
125 mm diameter x 450 mm
WX 950/100
100 mm diameter x 950 mm
WX 950/125
125 mm diameter x 950 mm
Flue extensions cannot be cut.
Also available are:
•
An adjustable extension (235 to 300 mm)
•
45° elbow
! NOtE !
The rigid flue between the boiler and flexible flue liner
should incorporate an adjustable section to allow
inspection and cleaning of the flue system.
Section 9: Flue System and air Supply
page 26
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