17
Grant Vortex Oil Boilers
Fig. 10 - Grant Orange flue system in typical
brick chimney
4 - GENERAL BOILER INFORMATION
It should be both the designer's and installer's concern
that the air required for these functions be introduced
so as to cause as little discomfort as possible to the
building occupants and thus to offer them the least
temptation to obstruct the ventilators.
Further details may be obtained from BS 5410:1:1997.
Notes:
For a boiler fitted in a compartment, which is
ventilated as shown, no additional allowance is
necessary.
Open flue - Extract fans, where needed, should
be in accordance with Section 4.4.7 in BS 5410
Part 1 1997.
All ventilation areas given are for domestic
applications. For all other cases refer to BS
5410 Part 2 1978.
Under no circumstances can Grant Vortex boilers
be installed with existing flue systems. Only flue
systems and components suitable for wet flues
should be used.
Failure to install the correct type of flue system will
invalidate the warranty.
See Fig. 10
General
Grant condensing boilers have high operating efficiencies
and low flue gas temperatures. Care must be taken to
ensure the flue system is suitable for the very low flue gas
temperatures and condensate in the flue gases.
Suitable conventional flue systems (Orange system)
are available from Grant UK - see Fig. 10.
1
The flue must terminate in a down draught free area,
i.e. at least 600 mm above the point of exit through the
roof or preferably above the ridge level.
2
The condensate may be allowed to run back into
the boiler. A condensate drain at the base of the
flue system is not required.
3
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. See Fig. 11.
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.
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).
Adjustable section
235 to 300mm
WXA250/100
WXA250/125
45 elbow
O
WE45/100
WE45/125
Brick
chimney
Flaunching
Locking band
C
Locking band
Terminal/top plate/
flexi flue adaptor
Rigid to flexi flue
connector (bottom)
Extension
Boiler flue
connector
Boiler
Flexi pack
Bottom fixings
Top fixings
Conventional flue system
4.7
Grant recommends the use of the Grant 'Orange'
flue system, specifically designed for the Vortex
range of condensing boilers. Refer to Section 4.7
for further details.
The maximum vertical height (from the top of the
boiler to the terminal) for the 'Orange' system is
19 metres.