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First of all, yes your drawing is correct.
And yes, you could use the 230V RT terminal, but it is slightly more complicated and involves the use of a link wire at the Salus, so I proposed what I considered to be the most straightforward & easiest method.
Also, the mains method only requires 3 wires to be run between the Salus and the boiler, instead of 4. Often then there is a temptation to use standard 3 core cable and use the earth wire as the third connection which is not good practice.
I always run two separate cables, one for the 24v and a separate one for the 230V, supply. Combining 230V and 24v in the same cable is also not good practice.
If it's the same boiler you do it exactly the same. It is the thermostat switch contacts that are described as 'volt free' which means that aren't connected to the 230V supply and they will switch any voltage that is applied to them. So they can be used with 230V or 24v. In the case of the example above it's 24v.
It's unusual though to have a wiring centre with a combi boiler though. Is that what you mean?
View attachment 176966
They are normally associated with systems that have a hot water cylinder or several heating zones and are fitted with motorised valves. If that is the case the installation is completely different, the thermostat controls the motorised valves and not the boiler directly.
So I can wire into the 230V RT (Pinky terminal next to the mains power).
I have an under floor heating system and a separate radiator zone upstairs. I’m using the Heatmiser under floor heating 8 zone wiring centre
First of all, yes your drawing is correct.
And yes, you could use the 230V RT terminal, but it is slightly more complicated and involves the use of a link wire at the Salus, so I proposed what I considered to be the most straightforward & easiest method.
Also, the mains method only requires 3 wires to be run between the Salus and the boiler, instead of 4. Often then there is a temptation to use standard 3 core cable and use the earth wire as the third connection which is not good practice.
I always run two separate cables, one for the 24v and a separate one for the 230V, supply. Combining 230V and 24v in the same cable is also not good practice.
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