Gas Supply; Flue System - Hamworthy UF150-1 Installation, Commissioning And Operating Instructions

4.2 Gas Supply.

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Gas supply pipes must be in accordance with BS 6891 or IGE/UP/2
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Gas supply connections to the boiler must not be smaller than the connection on the boiler - R1¼" all models.
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Gas installation must be soundness tested to BS 6891 or IGE/UP/1 & IGE/UP/1A.
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Gas installation must be purged to BS 6891 or IGE/UP/1 & IGE/UP/1A.
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Boiler inlet gas pressure; nominal 20mbar (minimum 17.5mbar) for Natural Gas or nominal 37 mbar (minimum
25mbar) for LPG dynamic at the connection to the boiler.
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Boiler house gas isolation valve must be clearly identified and installed close to the entrance / exit.

4.3 Flue System

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Flue termination, routing and construction must comply with the requirements of the Clean Air Act 1993, BS 6644,
BS 5440 and IGE/UP/10 where applicable.
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Upton boilers installed in modular format with a common flue, must use the manifold provided with the boiler prior to
any connection to the flue system which must be suitable for condensing application.
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Upton boilers are suitable for open flue (type B
maximum number of modules firing into a common chimney is 8. The flue system must be designed to limit the max.
suction to 100Pa (negative), measured at the flue sample point of the base module in the boiler stack. This condition
must be checked hot and with all boilers firing, the max. pressure at the flue sample point should not exceed those
stated in Appendix C Fig C1 - Flue data.
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Any stabiliser fitted must be in or close to the vertical chimney.
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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.
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Flue construction is recommended of a twin wall, insulated type to maintain buoyancy within the flue.
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Adequate facilities must be provided for draining the flue condensation.
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Horizontal flue runs must be kept as short as possible and be inclined at minimum 3° (50mm/m) towards the boiler.
For maximum equivalent flue lengths, refer to Appendix C.
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Any flue must be self-supporting and separable from the boiler for servicing requirements.
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Note: Due to high thermal efficiency of the Upton 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.
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Fan dilution - 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.
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Fan assist - the use of fan assist is not recommended as the boilers have sufficient fan performance to drive
the system. If in doubt, refer to HHL Technical.
HAMWORTHY HEATING LTD
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UPTON FLOOR STANDING SERIES 500001340/C