Heating boiler was wired into this contactor box in a garage (not huge house).
Boiler cable comes out the bottom, but WHY such a complcated setup domestically??
Does this suggest an electrical heating element somewhere. Something a 5amp control unit can't handle?It's 2 relays (not contactors) in a box, not exactly complicated.
Probably used to switch 2 bits of equipment by a single output or a single bit of equipment from 2 sources,, or something that takes more current than the switching output can handle or something else...
There, I think that's covered why
It looks to me like this is 2 devices controlling one boiler. Some arrangements of motorised valves require relays for correct operation.Does this suggest an electrical heating element somewhere. Something a 5amp control unit can't handle?
I have seen this (either/or) wiring on a house that has an electric shower plus an electric boiler. Too much load, so they switch from one to other but not both at same time.
So all this gubbins is to prevent unwanted feedback and starting of boiler or a pump over run requirement?It looks to me like this is 2 devices controlling one boiler. Some arrangements of motorised valves require relays for correct operation.
Something like that but from a distance We can't tell exactly.So all this gubbins is to prevent unwanted feedback and starting of boiler or a pump over run requirement?
In this the SPST relays enable the boiler after one or both valves have opened and started the pump. The timer relays leave the valve(s) open and the pump running to keep circulating the water to cool the boiler after is shut down.
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