Ideal Boilers mini HE C24 Installation And Servicing

INSTALLATIONmini HE --- Installation & Servicing 2525 EXTERNAL ELECTRICAL CONTROLSWiring external to the boiler MUST be in accordance with thecurrent I.E.E. (BS.7671) Wiring Regulations.For Ireland reference should be made to the current ETCIrules for electrical installations.The fuse rating should be 3A.Route the electrical supply flexible cord and the externalcontrol flexible cord as illustrated.Lock the flexible cords in place with the clamps provided.230V supplyELECTRICAL CONNECTIONS FOR ACOMBI BOILEROptional Programmer KitsOptional digital programmer kits are available with theirrelevant instructions.Both 24hr and 7day kits are available.Note: the switch contacts of any external programmer,room or frost thermostat must be volt free.Connecting a switched live feed to external controlsterminal block may be dangerous and will result inserious damage to the boiler.Room ThermostatThis should be wired as shown in diagrams A.Frost protectionCentral heating systems fitted wholly inside the house do notnormally require frost protection as the house acts as a‘storage heater’ and can normally be left at least 24 hourswithout frost damage.However, if parts of the pipework run outside the house or ifthe boiler will be left off for more than a day or so then a frostthermostat should be wired into the system.To maintain frost protection with the programmer selectorswitches set to OFF, all the controls MUST be left in therunning position.The frost thermostat should be sited in a cold place but whereit can sense heat from the system.Wiring should be as shown, with minimal disturbance to otherwiring.External ProgrammersOn the combi boilers, this should be of the single channeltype (as this boiler does not incorporate a pre---heat facility forthe instantaneous hot water service).Programmers with room thermostat --- see diagram B.Note. lf the boiler is installed in a garage it may be necessaryto fit a pipe thermostat, preferably on the return pipework.Earths are not shown for clarity but must never be omitted.APower supplyterminal blockExternal controlsterminal blockTRoom thermostatTOptional frost’stat12L N3BPower supplyterminal blockExternal controlsterminal blockTRoom thermostatTOptional frost’stat12L N3External programmerN.B. These diagrams are schematic only and do not showexternal terminal strips etc.INSTALLATION