Live wire from old pump on vented to system boiler
- Thread starter rhinosaw
- Start date
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And... If the main fused (3amp) spur for the heating system is in the airing cupboard, you'll need an isolation switch near the boiler too.
It’s very common.
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in case the lady of the house switches the boiler back on while the technician is working in the airing cupboard.
People have their boilers moved and you need local isolation for emergencies for homeowner and service personnel.
Its not a boiler main switch... Its for the whole system, most of which is usually found in the airing/cylinder cupboard, so it makes sense to have it there near to the wiring centre.
No you are wrong, the live for the pump MUST be connected to the new boiler, the switched live from the zone valves will already be connected to the existing boiler so that is fine, the new boiler will now need a permanent live as well as the existing switched live, you will also need a system by-pass installed as you have an S plan (if one not already fitted).
The reason , your replacement boiler is low water content, when a demand for CH or HW stops the zone valves close and the burner on the boiler stops, however the boiler will still be hot and the boiler will keep running the pump to cool itself, once the boiler is cool enough it will stop the pump
Now I'm confused again.
I understand that the zone valves are supplying the switched live.
But my pump must also be switched as it comes on and off with the zone valves so wouldn't supply a permanent live back to the boiler. There is no auto bypass valve so the pump doesn't stay on for pump overun, well there is no pump overun on this old boiler
I understand that the zone valves are supplying the switched live.
But my pump must also be switched as it comes on and off with the zone valves so wouldn't supply a permanent live back to the boiler. There is no auto bypass valve so the pump doesn't stay on for pump overun, well there is no pump overun on this old boiler
Additionally, rather than the heat in the boiler being lost out to atmosphere, it is used in the house - adding a tiny bit of extra efficiency.
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