Ideal Boilers Classic FF 250 P Installation And Servicing Manual

Classic FF - Propane Installation 7GENERALAIR SUPPLYDetailed recommendations for air supply are given in BS.5440:2.The following notes are for general guidance:1. It is NOT necessary to have a purpose provided air vent in theroom or internal space in which the boiler is installed.2. If the boiler is to be installed in a cupboard or compartment,permanent air vents are required (for cooling purposes) in thecupboard/compartment, at both high and low levels. The air ventsmust either communicate with room/internal space, or be directto outside air. The minimum effective areas of the permanentair vents, required in the cupboard/compartment, are specifiedas follows and are related to maximum rated heat input.3. Both air vents MUST communicate with the same room orinternal space or MUST be on the same wall to outside air.4. In siting the air vents care must be taken to avoid the freezing ofpipework.Refer to Table 4 for details of air vent position and sizing.Table 4 - High and low vent areasBoiler Air from room/internal Air directspace cm 2 (in 2 ) outside cm2 (in2)FF 250 P 170 (26) 83 (13)FF 260 P 198 (31) 102 (16)FF 275 P 264 (41) 132 (21)WATER TREATMENTThese boilers incorporate a cast iron heat exchanger. As part ofthe installation the central heating system should be thoroughlyflushed with appropriate water treatment in order to comply withBS7593:1992.Caradon Plumbing Ltd recommend the use of Fernox or BetzDearborn water treatment products which must be used inaccordance with the manufacturers instructions. For furtherinformation contact :-Fernox Manufacturing. Co. Ltd, Tandem House, Marlowe Way,Croydon, Surrey CRO 4XS, tel 0870 5601 5000 orBetz Dearborn Ltd, Widnes, Cheshire, tel. 0151 424 5351Important: Any other treatment for this product will render theguarantee of Caradon Plumbing Ltd INVALID.Notes.1. If an inhibitor is used, and in hard water areas wheretreatment to prevent lime deposits is necessary, it is mostimportant that the water treatment MUST be maintained at thecorrect concentrations recommended by the treatmentmanufacturer.2. Artificially softened water must not be used in the system,under any circumstances.THERMOSTATIC RADIATOR VALVESCaradon Plumbing Limited recommend that heating systemsutilising full thermostatic radiator valve control of temperature inindividual rooms should also be fitted with a room thermostatcontrolling the temperature in a space served by radiators notfitted with such a valve as stated in BS. 5449.When thermostatic radiator valves are used, the space heatingtemperature control over a living / dining area or hallway having aheating requirement of at least 10% of the boiler heat outputshould be achieved using a room thermostat, whilst other roomsare individually controlled by thermostatic radiator valves.However, if the system employs thermostatic radiator valves onall radiators or two port valves without end switches then abypass must be fitted to ensure a flow of water should all valvesbe in the closed position.ELECTRICAL SUPPLYWARNING. The appliance MUST be efficiently earthed.Wiring external to the appliance MUST be in accordance with thecurrent I.E.E. (BS 7671) Wiring Regulations and any localregulations which apply.The point of connection to the mains should be readily accessibleand adjacent to the boiler, except that for bathroom installations;the point of connection to the mains MUST be situated outside ofthe bathroom.Note. Where a room sealed appliance is installed in a roomcontaining a bath or shower then the appliance and any electricalswitch or appliance control utilising mains electricity should be sosituated that it cannot be touched by a person using the bath orshower.WATER CIRCULATION SYSTEMThe boiler must NOT be used for direct hot water supply. For thetypes of system and correct piping procedure refer to 'Introduction'and Frame 1.The central heating system should be in accordance with BS. 6798and, in addition, for Smallbore and Microbore systems, BS. 5449.The domestic hot water system, if applicable, should be inaccordance with the relevant recommendations of BS. 5546. Coppertubing to BS. 2871:1 is recommended for water carrying pipework.The hot water storage cylinder MUST be of the indirect type andshould preferably be manufactured of copper.Single feed, indirect cylinders are not recommended and MUSTNOT be used on sealed systems.The appliances are NOT suitable for gravity central heating, norare they suitable for the provision of gravity domestic hot water.The hot water cylinder and ancillary pipework, not forming part ofthe useful heating surface, should be lagged to prevent heat lossand any possible freezing - particularly where pipes run throughroof spaces and ventilated under floor spaces.The boiler must be vented (not on sealed system).IMPORTANTDraining taps MUST be located in accessible positions, whichpermit the draining of the whole system - including the boiler andhot water storage vessel. They should be at least 1/2" BSPnominal size and be in accordance with BS. 2879.The boiler is fitted with a special drain plug which is provided todrain the BOILER ONLY in the event of the system drain plugbeing unable to do so. The hydraulic resistances of the boilers, atMAXIMUM OUTPUT with an 11 oC (20 OF) temperature differential,are shown in Table 5.Maximum boiler operating temperature should be 82 oC (180 o F).Table 5 - Water flow rate and pressure lossBoiler Size FF 250 P FF 260 P FF 275 PBoiler kW 14.7 16.7 21.4Output Btu/h 50 000 57 000 73 000Water Flow l/min 19.0 22.8 30.3Rate gal/h 250 300 400Pressure mbar 31.5 41.7 77.0Loss in w.g. 12.6 16.7 30.9