Ideal Boilers Classic FF 250 P Installation And Servicing Manual

24 Classic FF - Propane InstallationINSTALLATIONNotes.1. Some earth wires are omitted for clarity.Ensure proper earth continuity whenwiring.2. Numbering of terminals on thermostats isspecific to the manufacturer.3. This is fully controlled system - set theboiler thermostat to maximum.4. Switchmaster valve has grey & orangeauxiliary switch leads but the grey wiremust be connected to the live supply.42 TWO SPRING CLOSED VALVEw whitey/g yellow/greenor orangev violetpk pinkgy grey43 FROST PROTECTIONPumped onlyLEGENDb bluebk blackbr brownr redy yellowCentral heating systems fitted wholly inside the house do notnormally require frost protection as the house acts as a 'storageheater' and can normally be left at least 24 hrs. without frostdamage. However, if parts of the pipework run outside the houseor if 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 and all othercontrols MUST be left in the running 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 of the programmer.Designation of the terminals will vary but the programmer andthermostat manufacturer's leaflets will give full details.If a boiler is installed in a garage it may be necessary to fit a pipethermostat.Diagram A shows a double pole frost 'thermostat, which shouldsuffice for all systems which do not use the OFF terminals of theprogrammer.Diagram B shows a 'change-over' frost 'stat, which will covermost systems which do use CH OFF. If, however, on such asystem the HW pipework is in an isolated part of the house, asecond frost 'stat may be used to protect it. If in doubt, ask yourinstaller for advice.INSTALLATION