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 - Installation 9Safety valve setting bar 3.0Vessel charge pressure bar 0.5 to 0.75System pre-charge pressure bar None 1.0System volume (litres) E x p a n s i o n v e s s e lv o l u m e (l i t r e s )25 1.6 1.850 3.1 3.775 4.7 5.5100 6.3 7.4125 7.8 9.2150 9.4 11.0175 10.9 12.9190 11.9 14.0200 12.5 14.7250 15.6 18.4300 18.8 22.1Multiplying factors forother system volumes 0.063 0.0744 SYSTEM REQUIREMENTS - CENTRAL HEATINGMains watersupplyBoiler3. Mains ConnectionThere must be no direct connection to the mains water supplyor to the water storage tank supplying domestic water, eventhrough a non-return valve, without the approval of the localwater authority.4. FillingThe system may be filled by one of the following methods:a. Through a temporary hose connection from a draw-off tapsupplied from a service pipe under mains pressure. Wherethe mains pressure is excessive a pressure reducing valvemust be used to facilitate filling.i. Thoroughly flush out the whole system with coldwater.ii. Fill and vent the system until the pressure gaugeregisters 1.5 bar (21.5 psi) and examine for leaks.iii. Check the operation of the safety valve by raising thewater pressure until the valve lifts. This should occurwithin 0.3 bar (4.3psi) of the pre-set lift pressure.iv. Release water from the system until the minimumsystem design pressure is reached - 1.0bar (14.5 psi)if the system is to be pre-pressurised.CH RETURN CH FLOWstop valvetest cockDouble check valveHosepipe(disconnectafter filling)Hoseunion bibtapNotes.a. The method of filling, refilling, topping up or flushing sealedprimary hot water circuits from the mains via a temporary hoseconnection is only allowed if acceptable to the local waterauthority.b. Antifreeze fluid, corrosion and scale inhibitor fluids suitable for usewith boilers having cast iron heat exchangers may be used in thecentral heating system. For further information contact:Fernox Manufacturing Co. Ltd.,Britannic Works, Clavering, Essex. CB11 4QZ.Tel: 01799 550 811orGrace Service ChemicalsGrace Dearborn Ltd.,Widnes, Cheshire. WA8 8UD.Tel: 0151 424 53511. Generala. The installation must comply with the requirements ofBS.6891:1988 and BS.5449:1.b. The installation should be designed to work with flowtemperatures of up to 82 0C.c. All components of the system must be suitable for aworking pressure of 3 bar (45psi ) and temperature of110 0C. Care should be taken in making all connections sothat the risk of leakage is minimised.The following components are incorporated within theappliance:• Circulating pump• Safety valve, with a non-adjustable pre-set liftpressure of 3bar (45 psi)• Pressure gauge, covering a range of 0-6 bar.• 8-litre expansion vessel, with an initial chargepressure of 0.75 bar.For further details refer to BS. 5449:1 and British Gaspublication 'Specifications for Domestic Central Heating andHot Water'.2. Make-up WaterProvision must be made for replacing water lossfrom the system, either:a. From a manually filled 'make-up' vessel with areadily visible water level.The vessel should be mounted at least 150mm (6")above the highest point of the system, and beconnected through a non-return valve to thesystem, fitted at least 150mm (6") below themake-up vessel on the return side of the domestichot water cylinder or radiators.b. Where access to a make-up vessel would bedifficult by pre-pressurisation of the system.Refer to note 4 'Filling'. The maximum cold watercapacity of the system should not exceed 127litres if not pressurized. However, if the system isto be pressurized the efficiency of the expansionvessel will be reduced and a larger vessel (orsmaller system volume) may be necessary. If thecapacity of the vessel is not considered sufficientfor this, or for any other reason, an additionalvessel MUST be installed on the return to theboiler. Guidance on vessel sizing is given in thetable shown and also in BS.7074:1 andBS.5449:1.