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 - Installation2INTRODUCTIONThe new Classic Combi FF280 is a cast iron, balanced flue,fanned gas boiler.Central heating (CH) output is spot rated at 23.4 kW (80 000Btu/h) with on/off thermostatic control and is suitable for use withheating loads down to 4.4 kW (15 000 Btu/h).Maximum instantaneous domestic hot water (DHW) output isalso 23.4kW (80 000 Btu/h).The boiler is designed for use with fully pumped sealed watersystems but can also be connected to open water systems ifrequired.The boiler casing is of white enamelled mild steel with aremovable controls pod. A drop-down door gives access to thecontrol box.Note. This boiler can only be used on fully pumped systems.The boiler is supplied fully assembled, with a domestic hot watercalorifier, diverter valve, circulating pump, pressure gauge,safety valve and CH expansion vessel (contained in a moduleon top of the boiler).Fixed temperature CH and DHW controls are fitted and theboiler incorporates a DHW 'preheat' facility.The module also includes a CH thermostatic valve and bypass.No external bypass is required.The domestic hot water and central heating pipe connectionsmay be made at the top or bottom of the boiler as required.The boiler is supplied with a standard flue kit suitable for rear orside outlet applications up to 600mm (23 1/2 "). Optional extraextension ducts up to 3m (118"), rear or side outlet, areavailable.Note. A Vertex Flue Kit with a side outlet may be used - see theVertex Flue Kit Installation Instructions for details.OPERATIONDomestic Hot Water (DHW)With no call for either DHW or CH the boiler will periodically fireat low gas rate for a few seconds, in order to maintain the DHWcalorifier in a preheated condition.Note. The DHW 'preheat' operates 24 hours a day unless anexternal programmer is fitted, when it can be timed.When there is demand for DHW the boiler fires at full gas rate,the diverter valve remains de-energised and the full output fromthe boiler is directed to the DHW calorifier, providing a maximumDHW draw-off of 9.6 l/m (2.1 gpm) at 35° C. temperature rise.At DHW draw-off rates below approximately 6 l/m (1.3 gpm) theboiler reduces to low gas rate when the DHW temperaturereaches about 60°C and maintains the low draw-offtemperature between 50°C and 75°C. When the demand forDHW is satisfied the 'preheat' cycle resumes, unless there is aCH demand, which takes priority.Central Heating (CH)When there is demand for CH, the boiler fires at full output, tosupply the demand. The CH circuit within the moduleincorporates a thermostatic valve which operates to maintain ahigh boiler temperature during periods of cold CH start-up,necessary for the instantaneous delivery of DHW , if there is ademand at this time. Water is not released to the system until atemperature of 60°C. is reached within the boiler.Refer also to 'Boiler Water Circuit Diagrams'.GENERALCONTENTSAir Supply ..................................................................... 7Boiler Clearances ......................................................... 6Boiler Exploded View ................................................. 46Burner Exploded View .............................................. .47Control Box Exploded View ..................................... .47Electrical Connections .............................................. 25Electrical Regulations ................................................. 8Extension Ducts - Fitting ........................................... 21External Control ......................................................... 27Fault Finding .............................................................. 48Flueing .......................................................................... 7Rear Installation ...................................................... 13Side Installation ...................................................... 17Gas Safety (Installation & Use)Regulations, 1994 ........................................................ 5Gas Supply ................................................................... 5Health & Safety Document No 635 ............................. 5Initial Lighting . .......................................................... 29Installation .................................................................. 11Mandatory Requirements ............................................ 5Pump ........................................................................... 24Servicing ..................................................................... 32Short List of Parts ...................................................... 54Spares Replacement .................................................. 35Terminal Guards. .......................................................... 7Thermostatic Radiator Valves. .................................... 8Water Circuit Diagrams ............................................... 4Water Connections .................................................... 24Water Requirements .................................................... 7