ELECTRICAL CONNECTION

Warning. This boiler must be earthedAll system components must be of an approved type.Connection of the whole electrical system and anyheating system controls to the electrical supply must be through a common isolator. Isolation should preferably be by a double pole switched fused spur box having a minimum contact separation of 3 mm on each pole. The fused spur box should be readily accessible and preferably adjacent to the boiler. It should be identified as to its use. A fused three pin plug and shuttered socket outlet may be used instead of a fused spur box provided that: External control connector Boiler's 230 V mains lead :- brown wire : line / blue wire : neutral / yellow and green wire : earth E Warning : you must respect the line / neutral connections to the 230 V mains supply. Fig. 9a Sch 151 No external controlsRoom thermostat onlyRoom thermostat and time clock Voltage free roomthermostat Time clock Do notconnect 1 2
Do not connect 3 1 1
Factory fitted linkVoltage free roomthermostat 2 2 3 3 1
Green wireRed wireWhite wire 2 3
Warning : - All external controls must be voltage free - On no account must any external voltage be applied to any of the external controls plug terminals Diagram 14 Sch 152 13