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• Switchmaster 300 Timer Switch Manual

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OOOOoooOOOOOOoohhh, I seeeeee. That cable you are referring to is the power supply to the boiler, then? And not the 'control' wiring. Ok, we need to know the exact model of Turbomax so that we can see what sort of timer controls can operate it, and where to connect them.

Or are you saying the this boiler was already connected to the Switchmaster via this cable? In which case what the Switchmaster did was to literally 'turn on' the boiler by providing it with power. I presume, in this case, that there was another similar cable coming out of the Switchmaster and going to a mains socket?

Switchmaster 300 Timer Switch Manual

OOOOoooOOOOOOoohhh, I seeeeee. That cable you are referring to is the power supply to the boiler, then? And not the 'control' wiring. Ok, we need to know the exact model of Turbomax so that we can see what sort of timer controls can operate it, and where to connect them.

Or are you saying the this boiler was already connected to the Switchmaster via this cable? In which case what the Switchmaster did was to literally 'turn on' the boiler by providing it with power. I presume, in this case, that there was another similar cable coming out of the Switchmaster and going to a mains socket? Ok, this ain't the correct way to wire it, but it's obviously the way the installer originally did it on yours. (The 'correct' way is for the boiler to be supplied directly from a power source such as a FSU or unswitched socket. And then the timer is connected to the boiler with its own cable, going to the L, N and 3,4 and 5 terminals inside the boiler.) Oookkkaaaayyy.

You first take the L, N and E wires from the mains plug/source to the Switchmaster's backplate. They go as follows: Mains Live to 'L' on the backplate Mains Neutral to 'N' on the backplate. Mains Earth to the 'earth' terminal on the backplate. Phew, easy so far. You then take the cable that's going to the boiler and wire it to the backplate as follows: Boiler's Live to terminal '1' on the backplate Boiler's Neutral to 'N' on the backplate (now shared).

Then you take an insulated 'link' wire (a short piece of brown-sleeved wire) from the 'L' on the backplate (now shared) to terminal '4' on the backplate. Boiler's Earth to the backplate's earth. Terminals 1 and 4 are the 'switching' terminals. The boiler will only get power when these two terminals are 'closed' inside - when the timer tells it to.

What I don't understand tho' is, how do you get this boiler to heat your hot water?!