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Electrical Requirements for Boiler

Electrical Requirements for Boiler. A permanent 220 Volt mains supply for the boiler control panel. This is fed through the High temperature stat as standard. Two 220 Volt supplies controlled by the time clock in the house. One Supplies the circulation pump.

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Electrical Requirements for Boiler

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  1. Electrical Requirements for Boiler • A permanent 220 Volt mains supply for the boiler control panel. • This is fed through the High temperature stat as standard. • Two 220 Volt supplies controlled by the time clock in the house. • One Supplies the circulation pump. • The second to connect a contactor. (Only required if the Zero Voltage contact isn’t available from the time clock)‏

  2. Description of the use of the Contactor • A contactor can be used to create the 0 Volt circuit. • This enables the boiler to be started and stopped in a controlled manner. • The contactor is in the normally open position when no power is supplied to it. • This means that the boiler control panel doesn’t detect any signal when the power is off to the contactor i.e. doesn’t start. • When the power is switched on the contactor closes the zero volt circuit and the boiler goes to ignition 1. If the power is switched off the boiler stops and the fan continues to run.

  3. Nopower to the contactor Live Boiler External Cut Off + Boiler doesn’t detect The circuit closed so Remains off Neutral Boiler External Cut Off - Power to the contactor Live Boiler External Cut Off + Boiler detects the circuit closed so the boiler goes to ignition 1 Neutral Boiler External Cut Off -

  4. Permanent 220 Volt Power Supply Two wires connected to contactor

  5. Control Panel when the contactor is not powered Is displayed when the Power to the contactor Is off. Ext

  6. Control Panel when the contactor is powered Is displayed when there is Power to the contactor. Ignition 1

  7. Example Make of Contactor • Hager ES 220 239220 Approx 15 euros 1 to + on the external cut off A1 Live A2 Neutral 2 to - on the external cut off

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