HAMWORTHY HEATING LTD
9
MILBORNE
500001130/J
Figure 4.3.1 - Flue Connection - Open Flue - ‘1’- Flue connection, ‘2’ - Air inlet
4.3 Flueing
•
The Milborne flue systems supplied by Hamworthy are non UV stabilised polypropylene
and are therefore suitable for internal use only. For external flue runs and termination,
either use the dedicated kits supplied by Hamworthy or refer to a chimney specialist .
•
Flue termination, routing and construction must comply with the requirements of the
Clean Air Act 1956, BS 6644, BS 5440 and IGE/UP/10 where applicable.
•
Milborne boilers installed in modular format with a common flue, must use the header
provided with the boiler prior to any connection to the flue system. Individual modules
must be flued using the 50mm polypropylene flue ducts provided .
•
Milborne boilers are suitable for open flue (type B
23
) installation, drawing combustion air
from the plantroom, or room sealed, twin duct (type C
53
) installation - see section 5.2
•
Due to the low flue gas temperature, (~50°C) condensation will occur in the flue, flue
materials must be non-corrosive and utilise fully sealing joints.
•
Adequate facilities must be provided for draining the flue condensation. Any horizontal
runs of flue must provide condense drainage from the flue header/chimney. The flue
system MUST NOT drain through the boiler - see section 5.2
•
Horizontal flue runs must be kept as short as possible and be inclined at minimum 2°
towards the terminal. Maximum equivalent length of flue - 30m.
•
Any flue must be self-supporting and separable from the boiler for servicing
requirements.
•
Note: Due to high thermal efficiency of the Milborne boiler and the resultant low flue gas
temperatures there will be visible pluming of the flue gases at the flue termination. This
is likely even when the boiler is not operating at condensing temperatures.
