Ideal Boilers Classic Combi FF 280 Installation And Servicing

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Classic Combi FF 280 - Installation 27INSTALLATIONINSTALLATION1. CLOCK CONTROL OF HEATING ONLY24 hr. DHW Preheat2. FULL CONTROL WITH PROGRAMMER & ROOMTHERMOSTATTimed DHW PreheatExternal wiring must be in accordance with the current I.E.E.(BS.7671) Wiring Regulations. Difficulty in wiring should notarise, providing the following directions are observed. Refer tothe Pictorial and Schematic Wiring Diagrams (Frames 49 and50).a. Room thermostatRemove the link between terminals RS1 and RS2. Wire inthe room thermostat. (Reference should be made to themanufacturer's instructions).b. ProgrammerRemove the link between terminals CH and L1, and CLand HW. Wire in the time switch according to Diagrams 1and 2.Note.Wire the programmer and the room thermostat neutralsinto terminal CNc. Frost protectionCentral heating systems fitted wholly inside the house donot normally require frost protection as the house acts as a'storage heater' and can normally be left at least 24 hrs.without frost damage.However, if parts of the pipework run outside the house orif the boiler will be left off for more than a day or so, then afrost thermostat should be wired into the system.This is usually done at the programmer, in which case theprogramme selector switches are set to OFF - all othercontrols MUST be left in the running position. The frostthermostat should be sited in a cold place but where it cansense heat from the system.Wiring should be as shown, with minimal disturbance toother wiring of the programmer. Designation of theterminals will vary but the programmer and thermostatmanufacturer's leaflets will give full details.Diagram A shows a double pole frost thermostat, whichshould suffice for all systems which do not use the OFFterminals of the programmer.Diagram B shows a 'changeover' frost thermostat, whichwill cover most systems which do use CH OFF. If, however,on such a system the HW pipework is in an isolated part ofthe house, a second frost thermostat may be used toprotect it.If in doubt, ask your installer for advice.Note.Secure any leads with the cable clamps provided.Refit the terminal box cover.48 EXTERNAL CONTROLS