Hamworthy Spetisbury Installation, Commisioning And Maintenance Instructions

Hamworthy Spetisbury Installation, Commisioning And Maintenance Instructions Manual pdf 10 page image

HAMWORTHY HEATING LTD4SPETISBURY 500001118/C3.5 Minimum System Water PressureTo comply with guidance note PM5 (Health and SafetyExecutive), the minimum pressure requirements at theboiler are given below as examples :-1) Single installed boiler running at 82°C flowtemperature. Minimum head required is not less than 2metres or 0.2 bar.2) Single installed boiler running at 95°C flowtemperature. Minimum head required = 5.1 metres or0.5 bar. See Section 8.9.13) Modular boiler installation running at 82°C flowtemperature and 11°C rise across system. Minimumhead required = 4.3 metres or 0.42 bar.4) Modular boiler installation running at 82°C flowtemperature and 15°C rise across system. Minimumhead required = 9.4 metres or 0.92 bar. See Section8.10 for Pressurised Water Systems.4.0 LOCATION4.1 The boiler location must permit the provision ofa satisfactory flue system, and provide adequatespace around the boiler for servicing and aircirculation.Sufficient space must be provided at the front of theboiler to allow the removal of the burner assemblyfor servicing/replacement, and at the rear forinstallation of pipes, valves and flue.Sufficient clearance around the boiler must also beprovided to allow access for servicing. Refer toFigure 15.2 for recommended clearances.The boiler room, or compartment, housing the boiler(s) - whether specifically constructed for thepurpose, or a modification of an existing space -should be in accordance with the requirements ofBS.6644.Where a separate purpose built boiler room is notavailable, measures should be taken to protect theboiler or boilers from damage, and the boiler shouldbe sited such that extraneous material cannot bestored next to, or against it.The boiler stands on a steel cradle and therefore itrequires installing on a suitable level non-combustible surface, capable of withstandingtemperatures of 65 ° C and able to support the weightof the boiler (including pipework and ancillaryequipment) when filled with water. A steel sheetcan be placed beneath the boiler cradle to facilitatemovement of the boiler during assembly. If a plinthis required, it should be level, non-combustible,50mm nominal height, and must be equal in width tothe boiler casing dimensions.The compartment housing the boiler must havepermanent air vents communicating directly with theoutside air at both high and low level. Refer toSection 7 for details.5.0 GAS SUPPLY5.1 Gas Service PipesThe local gas region should be consulted at theinstallation planning stage to either determine thefeasibility of providing a gas supply or, where thereis an existing supply, to ensure that the metercapacity is adequate for the rated input of theproposed new boiler. An existing gas service pipemust not be used without prior consultation with thelocal gas region.5.2 Gas MetersA new gas meter will be connected to the service pipeby the local gas region, or a local gas region contractor.An existing meter should be checked, preferably by thegas region, to ensure that it is adequate to deal with therate of gas supply required.5.3 Gas Supply PipesSupply pipes must be fitted in accordance with BS 6891or IGE/UP/2. Pipework from the meter to the boiler mustbe of adequate size. Do not use pipes of a smaller sizethan the boiler gas connection. The complete installationmust be purged and tested for soundness as describedin BS 6891 or IGE/UP/1 and IGE/UP/1A asappropriate.A manual shut off valve must be fitted on the incominggas supply pipe, adjacent to each boiler, in an easilyaccessible position.5.4 Boosted Gas SuppliesWhere it is necessary to employ a gas pressurebooster, the controls must include a low pressure cut-offswitch at the booster inlet. The local gas region must beconsulted before a gas pressure booster is fitted.5.5 Boiler House Gas Control ValveA manual valve for boiler house isolation shall be fittedin the gas supply line. It shall be clearly identified andreadily accessible for operation, preferably by an exit.