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HAMWORTHY HEATING LTD

SHERBORNE

500001167/E

C1.2 Waste Gas Volume & Temperature.

Where the boiler(s) discharge into a chimney system, it is recommended that the volume & temperature of the
waste gases used for design of the flue system are as detailed in the Flue Data table.

C1.3 Suction

The flue system must be designed acknowledging that there is a positive pressure generated by the combustion fan. It is

recommended that a draught stabiliser is fitted to the flue system where the draught is likely to become –ve at the
boiler connection.

C1.4 Maximum Length of Flue Duct

For single boiler installations, the maximum allowable linear

equivalent length of straight ducts for both twin duct & concentric
systems is 10m & 7m respectively. This dimension relates to the
distance between the boiler & the discharge terminal. Figure
C1.1 details the equivalent length of flue tube. Components can
be combined in any order provided that the total equivalent
length of flue does not exceed the maximum.

Note:

if the

maximum stated length is exceeded, the boiler will not achieve
maximum output.

C1.5 Disconnection

Each boiler is fitted with a telescopic appliance connector, enabling the boiler to be disconnected from the flue
system.

WARNING: THE FLUE SYSTEM MUST BE SELF SUPPORTING & NOT PRESENT

A RISK TO PEOPLE IN OR AROUND THE BUILDING.

C1.6 Flue Discharge

The flue system must ensure safe & efficient operation of the boiler to which it is attached, protect the combustion
process from wind effects & disperse the products of combustion to the external air. The flue must terminate in a
freely exposed position situated to prevent the products of combustion entering any opening in a building. Where
the application requires the flue discharge to terminate below 2m above ground level, the use of a terminal guard
is required.

C1.7 Surface Temperatures

Combustible materials in the vicinity of the boiler & flue shall not exceed 65°C during boiler operation. The flue
shall not be closer than 50mm to any combustible material, except where it passes through such material with a
non-combustible sleeve when the air gap may not be less than 25mm.

C1.8 Location

The flue system must not be placed or fitted where there is undue risk of accidental damage to the flue pipe or
undue danger to persons in the vicinity. Check that the flue & chimney are clear from any obstruction. Sherborne
boilers are suitable for installation in a balanced compartment in accordance with the requirements of BS 6644.
Consult Hamworthy Heating Technical Department for help or assistance if in doubt.

C1.9 Condensate Discharge

Due to the high thermal efficiency of the boiler, condensation will occur within the boiler casing during firing from
cold conditions. A drain with an integral trap is fitted to the rear of each module suitable for connection to a 32mm
plastic waste pipe (not Hamworthy Heating Ltd supply), which must be connected to a tundish (not Hamworthy
Heating Ltd supply). Discharge piping from a tundish should be of synthetic material due to the mild acidity of the
condensate (pH3-5), with all discharge piping having a minimum fall of 30mm/m away from the boiler.
Consideration should be given to possible freezing of condense water traps & pipework. This must be avoided at
all times by routing pipework within the building, where possible

Flue Resistance

Equivalent tube lengths.

Component

Length m

Straight tube ø100mm per m

45° bend ø100mm

2.25

Concentric 90° bend Ø100/150mm

2.20

90° bend ø100mm

4.10

Concentric straight tube Ø80/125mm /m