can any one tell me why my myson opollo fanfare s gas boiler has got 2 wires going into it?

Question

ive had a engineer in to change mid position valve but he could not wire it in he said the old valve (cant se what make it is) had 6 wires the new one (drayton mid position valve) has only got 5 he said that is ok but he cant understand why boiler has 2 wires to it he said i need an electrician to re wire whole system can any one tell me if this is realy needed.... i got the impression he didnt understand the electrics and just wanted to get away

Answer 1

no matter how many cables are at the boiler, and i presume you mean 2 round white cables, the mid position valve does not connect to the boiler, it should connect into a square 6x5" box along with another load of cables near your boiler, what he should have done is went back to the plumbers merchants and obtained a mid position valve to match the old one, fitted it to the pipework and then just connected the wires one for one in the box or he could have just changed the motor inside the valve head thus avoiding a drain down and costing half the price, and only 2 little thin wires to worry about.
hope this helps.

Answer 2

Assuming your 2 wires are in fact 2 X 2 core cables, one pair will operate the boiler (bring it on) The second pair will be from the 'over-run 'sensor, when the boiler has been running, and the 'operate' cable no longer 'live' it is nessescary to cool the bolier down. The 'Over-Run' sensor does just that, keeps the water circulating (by running the pump) through the boiler until its cold.

Answer 3

I think he may have been talking about the boiler needing an equipment grounding conductor. Is your house really old? My first thought is that if your house is old, that it may have been wired with only 2 wires. Old installations didn't call for an equipment grounding conductor. That's why some homes have 2 pronged plugs rather than 3 prongs.

If this is the case, code may allow you to connect the neutral and the equipment ground together for existing installations only. It's very possible I am wrong.

Answer 4

have your wiring checked out before you pay out check your insurance cover. if your house is old and you have no earth to your appliances apart from the obvious danger your warranties wont be worth the paper the are written on always remember it's your life and it may be nice to speak to god but not in person

Answer 5

I Know the best people to answer your question who i have just used is http://www.tradeplumbing.co.uk

they can answer any of your questions also supply the goods good luck hope this is of help

peter

Answer 6

i would say 1 for timer and room stat, and 1 for ignition