Balanced Flue Options; Grant Ez-Fit Flexi Pack Conventional Flue System; Contents Of Grant Ez-Fit Flexi Pack; Extensions - Grant Combi 70 V3 User's Installation Manual

10 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.

Grant EZ-Fit Flexi Pack conventional flue system

(Orange System) - See Fig. 13
A range of Flexi pack conventional flue lining kits are
available from Grant UK. The packs have been
specifically produced for Grant Vortex Combi
condensing boilers.

Contents of Grant EZ-Fit Flexi Pack

The pack includes a smooth bore flexible stainless steel
100 mm diameter flue liner with chimney top clamping
plate, a rigid to flexi adaptor for the top of the liner, a rigid
to flexi adaptor for the bottom of the liner, a terminal, a
boiler connector (CFCA15/46) suitable for all Grant
Vortex condensing boilers and a connector from the
boiler adaptor to rigid flue system.
Part No. Description - Flexi Pack
GFKIT6 Flexi pack with 6 m liner, terminal and adaptors
GFKIT8 Flexi pack with 8 m liner, terminal and adaptors
GFKIT10 Flexi pack with 10 m liner, terminal and adaptors
GFKIT11 Flexi pack with 11 m liner, terminal and adaptors
Part No. Description - Extensions
WX150/200 150 mm extension with locking band
WX250/200 250 mm extension with locking band
WX450/200 450 mm extension with locking band
WX950/200 950 mm extension with locking band
WXA250/200 195-270 mm adjustable extension with locking band
WE45/200 45° elbow with locking band

Extensions

A range of white powder coated twin 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 is available. 45° elbows are
also available.
The rigid flue between the boiler and flexible flue liner
should incorporate an adjustable section to allow
inspection and cleaning of the flue system.
24
5 - GENERAL BOILER INFORMATION
Combi V3, Combi Max and Vortex Combi models
5.8

Balanced flue options

Apart from a conventional flue, several balanced flue
options are available for use with Grant Combi boilers.
All are suitable for use with Class C2 kerosene and Class
D Gas oil (kerosene only for the Vortex Combi).
When using Gas oil, the flue must terminate a
minimum of 2 metres above outside ground level.
Note: None of the flue sections in the following
system can be cut.
1 Low level horizontal balanced flue (Yellow system)
Available in Short (for single thickness brick walls)
and Standard kits.
Extensions are available which extend the flue by
225 mm, 450 mm or 675 mm. 90° and 45° elbows
are also available.
The maximum flue length - from the centre of the
boiler flue outlet to the outer face of the wall - is 2
metres (with or without elbows included). No more
than 2 x 45° or 1 x 90° elbow should be fitted per
system.
IMPORTANT: For Vortex Combi boilers with the
flue to the left hand side - leave a minimum gap of
150 mm between the side of the boiler and the wall
to accommodate the condensate trap.
2 High level (horizontal) balanced flue (White
system)
Allows the flue to rise vertically within the building
before exiting through the wall horizontally.
The maximum flue length - from the top of the
boiler flue outlet to the outer face of the wall - is 4
metres for the Combi V3 and Combi Max and 6
metres for the Vortex Combi.
Extensions are available which extend the flue by
225 mm, 450 mm or 950 mm. An adjustable
extension of 275 to 450 mm is also available.
A 45° elbow is also available. No more than 2 x 45°
elbows should be fitted per system. Each elbow
reduces the overall maximum length of the system by
1 metre.
3 Vertical balanced flue (White system)
Allows the flue to rise vertically from the boiler to
exit through the roof.
The maximum flue length - from the top of the
boiler flue outlet to the terminal - is 6 metres for
the Combi V3 and Combi Max and 8 metres for the
Vortex Combi.