HAMWORTHY HEATING LTD
41
UPTON FLOOR STANDING SERIES
500001340/C
drain connection in the flue. The drain pipe must be manufactured from a corrosion resistant material and at least
15mm diameter. It must have a fall of at least 3° (approx. 50mm/meter) and connect to a drain via a waste trap.
c. Boiler flue outlet sizes
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A flue system designed with the same diameter as the boiler flue outlet may not provide
satisfactory performance in all applications. Conversely a flue system designed with a smaller diameter than the
boiler flue outlet may provide satisfactory performance. Consideration must be given to the correct calculation of
the required flue size. If in any doubt consult Hamworthy Heating Ltd who working in partnership with Midtherm
Engineering Ltd can provide a comprehensive flue design and installation package.
C1.2 Waste Gas Volume and Temperature.
It is recommended that the volume and temperature of the waste gases used for design of the flue system are as
given in the above tables.
C1.3 Materials.
Materials used for the flue system must be mechanically robust, resistant to internal and external corrosion, non
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combustible and durable under the conditions to which they are likely to be subjected. Consideration must be
given to avoid possible freezing of condense water traps and pipe work.
C1.4 Suction
The flue system must be designed acknowledging that there is a positive pressure generated by the boiler combustion
fan. Refer to table Appendix C.
The flue system must be designed to limit the max. suction to 100Pa (negative). This condition must be checked hot and
with all boilers firing, the max. pressure at the flue sample point should not exceed the values in Appendix C.
Any stabiliser fitted must be in or close to the vertical chimney.
Fan Dilution
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The design must provide for the use of balancing and trim dampers, and their location and
operation must be such that the constraints detailed above can be met. Care must be taken to ensure that the fan
performance is matched to deliver the appropriate dilution, whilst ensuring that excessive suction is not applied to
the boilers. If in doubt, refer to HHL Technical.
C1.5 Disconnection
Provisions should be made for disconnection of the flue pipe for servicing. It is advisable that bends are fitted with
removable covers for inspection and cleaning as appropriate.
WARNING: THE FLUE SYSTEM MUST BE SELF SUPPORTING AND NOT PRESENT
A RISK TO PEOPLE IN OR AROUND THE BUILDING.
C1.6 Flue Discharge
The flue system must ensure safe and efficient operation of the boiler protecting the combustion process from
wind effects and dispersing the products of combustion to the external air. The flue must terminate in a freely
exposed position and be so situated as to prevent the products of combustion entering any opening in a building.
Where the flue diameter is less than 204mm (8”) diameter a terminal must be fitted. Where the flue is of a larger
size, consideration should be given to the fitting of a flue discharge terminal or grille to stop ingress of birds etc.
C1.7 Surface Temperatures
Combustible materials in the vicinity of the boiler and 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
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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 and chimney are clear from any obstruction. Upton
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 each module suitable for connection to a 34mm o.d.
Polypropylene 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
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