Ideal Boilers Classic Combi FF 280 Installation And Servicing

Also see for Classic Combi FF 280: Installation and Servicing Manual User guide

Classic Combi FF 280 - Installation8Water connections maybe made at the top of, or to the bottomof the boiler.IMPORTANTEnsure that the mains water supply pressure is adequate toprovide the required DHW flow rate. Refer to Tables 1 and 3 onpage 3.The central heating system should be in accordance with BS.6798 and, in addition, for smallbore and microbore systems,BS. 5449.The domestic hot water system should be in accordance withthe relevant recommendations of BS. 5546.Copper tubing to BS. 2871:1 is recommended for water-carrying pipework, and MUST be used for pipework carryingpotable water.Ancillary pipework not forming part of the useful heating surfaceshould be lagged to prevent heat loss and any possible freezing- particularly where pipes run through roof spaces andventilated underfloor spaces.IMPORTANTDraining taps MUST be located in accessible positions, whichpermit the draining of the whole system. They should be at least1/2" BSP nominal size and be in accordance with BS. 2879.Maximum recommended system hydraulic losses are given inTable 6 below:Table 6 - Water flow rate and pressure lossSystem load kW 23.4 19.0 4.4(Btu/h) (80 000) (65 000) (15 000)Water flow rate l/min 22.5 24.8 5(gal/h) (297) (327) (75)Temperature °C 15 11 11differential (°F) (27) (20) (20)Pressure mbar 157 118 391available for system (in. w.g.) (63) (47) (157)GENERALTHERMOSTATIC RADIATOR VALVESCaradon Ideal Ltd. recommend that heating systems utilisingfull 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 havinga heating 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 2 port valves without end switches then a bypassmust be fitted to ensure a flow of water, should all valves be inthe closed position.ELECTRICAL SUPPLYWiring external to the appliance MUST be in accordance withthe current I.E.E. (BS.7671) Wiring Regulations and any localregulations which apply.The point of connection to the mains should be readilyaccessible and adjacent to the boiler, except that for bathroominstallations; the point of connection to the mains MUST besituated outside of the bathroom.Note. Where a room sealed appliance is installed in a roomcontaining a bath or shower then the appliance and anyelectrical switch or appliance control utilising mains electricityshould be so situated that it cannot be touched by a personusing the bath or shower.