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Oil Boiler Isolation Switch.

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Evenin' All,


Regarding an external ground sited domestic oil fired boiler for heating and hot water that has an internal switched fused connection unit nearby inside the house, what regulations will require an external electrical isolator adjacent to the oil boiler? You know the sort of thing, a double pole rotary isolator. 


Z.


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  • 0
    So long as it is all on one phase and one fuse, (and I hope it is), then you can have n zones, so  n thermostats  (and maybe n timers )in series with the n valve operated switches.

    When the timer and 'stat says 'go' for that zone, the valve gets power and pulls over, and when it is open for water to flow  the swithc on the valve does its thing, and the boiler gets power on the 'firing' signal  - if more than one  valve(s) are open  as more than one zone is asking for heat, then there are many switches in parallel, all on, the boiler is OK with that, it only goes off when the last zone valve shuts.


    Yes HW is normally pressure drop based.

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  • 0
    So long as it is all on one phase and one fuse, (and I hope it is), then you can have n zones, so  n thermostats  (and maybe n timers )in series with the n valve operated switches.

    When the timer and 'stat says 'go' for that zone, the valve gets power and pulls over, and when it is open for water to flow  the swithc on the valve does its thing, and the boiler gets power on the 'firing' signal  - if more than one  valve(s) are open  as more than one zone is asking for heat, then there are many switches in parallel, all on, the boiler is OK with that, it only goes off when the last zone valve shuts.


    Yes HW is normally pressure drop based.

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