Harrier GT Range
- Installation
7
INSTALLATION
5
CHIMNEY CONNECTION
8219-EN-21
As the Harrier GT is a high performance boiler, the
temperature of the flue gases may be less than 160˚C.
The installer ought to take all precautions (padding out,
casing, T for draining condensation) in order to avoid deterio-
ration of the chimney.
If necessary, the baffles of the 4 upper smoke chambers may
be partially removed with a resulting increase in temperature
of the flue gases.
5.1 FLUE SIZING
To size the height and cross section of the chimney, refer to
the regulations currently in force. Harrier GT boilers are
boilers with pressurised combustion chambers and the
pressure of the outlet must not exceed 0 mbar unless special
precautions are taken to seal carefully between the outlet
and flue.
The installer should provide a measuring point (ø 10 mm
hole) on the flue for burner adjustment and control of the
combustion. Detailed recommendations, relating to the
design of flues for GAS fired appliances are quoted in BS.
6644 and British Gas Publication No. IM 11., whilst BS. 5410
Pt. 3 similarly applies OIL fired burners.
5.2 DIMENSIONAL INFORMATION NEEDED FOR CONNECTION
5.3 CONNECTION
Connection should be made according to regulation and
practice by using a sealed pipe in a material able to
withstand hot combustion gases and possible acidic conden-
sation. The connection should be removeable and present
minimal loss of load, it means it should be as short as
possible and without sudden change of cross section.
Its diameter should always be at least equal to that of the
boiler outlet, 180 mm for the 4, 5 and 6 section boilers and
200 mm the 7, 8 and 9 section boilers.
8219-EN-18