hi i am changing a Horstmann HRT3 for a MTS200 the HRT3 has 3 wires natural to 1 N - live to 2 L - control/load to 3 NO -do i need to do any thing else thank you
From an electrical point of view L, N and Load are all that you need.
However, you don't mention what you are planning to control with it. Just be aware that there are different versions of MTS200, and sometimes people get the wrong one. The bottom of page 1 of the manual that came with yours will tell you what it's for. Here's an example from one version. Other versions are available.
FYI you should really have posted this in the 'Plumbing and Central Heating' or 'Electrics UK' forum. See the note below which is shown at the top of this ('Your Projects') forum.
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