Ideal Boilers Classic m3050 Installation And Servicing

Ideal Boilers Classic m3050 Installation And Servicing Manual pdf 20 page image

20 classic m - Installation & ServicingINSTALLATION29 EXTERNAL ELECTRICAL CONTROLSWiring external to the boiler MUST be in accordance with thecurrent I.E.E. (BS.7671) Wiring Regulations and any localregulations.The fuse should be 3A.Room ThermostatIf the thermostat has a neutral connection use it. (It providesfor more energy efficient operation by reducing switchingtemperature differentials.)If parts of the pipework run outside the house or if the boilerwill be left off for more than a day or so then a frost thermostatshould be wired into the system. This is usually done at theprogrammer, in which case the programmer selector switchesare set to OFF and all other 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.Note. If the boiler is installed in a garage it may be necessaryto fit a pipe thermostat, preferably on the return pipework.Designation of the terminals will vary but the programmer andthermostat manufacturers' leaflets will give full details.Diagram A shows an application to boilers fitted with a roomthermostat onlyDiagrams B and C show applications to boilers fitted withalternative time controls.Earths are not shown for clarity but must never be omitted.L3 L2 L1NRoom ’statNif requiredOptional Frost ’statEcl 1543AMains inSystem controlsL3 L2 L1NRoom ’statNif requiredOptional Frost ’statEcl 1544BMains inSystemcontrolsL3 L2 L1NRoom ’statNif requiredOptional Frost ’statEcl 1545CMains inSystemcontrols28 INTERNAL WIRINGIncoming mainswiring detailA pictorial wiring diagram is shown in Frame 29 .1. Route the mains cable into the bottom Rear centre of the boiler.2. Wire the live and neutral and earth wires into the plug.Note. Ensure that the lengths of the current carrying conductorsare shorter than the earth conductor so that if the cable slips in itsanchorage the current carrying conductors become taut before theearth conductor.3. Secure the mains lead with the cable clamp.4. Reconnect the mains lead plug. Ensure it is fully located.Note. Wire any switched live supply into L2.Ecl 1542Mains Plug(supplied in hardware pack)Socket(fixed to boiler)Remove link when connecting external programmer.Ecl1257L3NL2L1INSTALLATION