29
9.5 Grant Hybrid System
This vertical option allows the use of
an existing chimney using part of the
‘Green’ system and the flexible liner and
terminal of the Grant ‘Orange’ system.
See Figure 9-4.
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 inch).
The maximum vertical height (from
the top of the boiler to the terminal) for
the‘Orange’ system is 19 metres.
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.
!
NOTE
In order to correctly connect the
Grant hybrid system, it will be
necessary to purchase the Grant
Starter Elbow.
This insulated Starter elbow
includes the boiler connector,
complete with test point, replacing
the low level terminal and flue guard
supplied with the boiler.
!
NOTE
Figure 9-3: Vertical hybrid flue (Green to Orange system)
9.6 Conventional Flue Systems
All flue components are stainless steel
and fully insulated with ‘O’ ring seals
and locking bands.
The flue must terminate in a down
draught free area, i.e. at least 600 mm
above the eves or point of exit through
the roof, or preferably above the ridge
level.
The condensate may be allowed to run
back into the boiler. A condensate drain
at the base of the flue system is not
required.
The flue terminal must be at least
600 mm from any opening into the
building, and 600 mm above any
vertical structure or wall less than a
horizontal distance of 750 mm from
the terminal.
No part of any flue system should be
made of an asbestos material; alumin-
ium 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.
Do not use fire cement. The use of
high temperature silicone sealants is
recommended.
!
CAUTION
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.
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.
!
NOTE
To Next Page
Loading...
