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9.3 Grant Horizontal System
This option uses the Grant Straight
Starter boiler connector, replacing
the low level terminal and flue guard
supplied with the boiler, along with
components from the Grant Green
system. See Figure 9-2.
!
NOTE
Under no circumstances can the
external module be installed with an
existing flue system. Only Grant flue
systems and components suitable
for wet flues should be used.
Failure to install the correct type
of flue system will invalidate the
guarantee.
Figure 9-2: Horizontal external flue
9.1 Air Supply
A permanent air supply must be
provided to the burner, sufficient to
ensure proper combustion of fuel and
effective discharge of combustion
products to open air.
The ventilation openings provided in the
upper part of the front door of the boiler
casing must not be obstructed at any
time.
9.2 Low Level Discharge Flue
The Grant VORTEX Eco External module
is supplied with a low level discharge
flue (see Section 4).
The minimum dimensions for locating
the standard terminal from building
features (windows, doors, etc.) are
shown in Figure 9-1.
The terminal must be positioned so
as to avoid products of combustion
accumulating in stagnant pockets
around the buildings or entering into
buildings. Care should be taken that the
plume from the condensed flue gases
does not cause a nuisance.
Where it is not practical to use this flue,
the external module may be fitted with
an alternative flue system available from
Grant UK.
A complete list of Grant Green system
flue components are given on page 28.
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