Relay problem.
All 240v AC items. I am adding an additional motorised valve to a central heating system which is an S plan with 2 on/off motorised valves. Everyone tells me this is simple and needs no relays, etc, but as soon as my newly connected motorised valve puts 240 volts into it's orange output cable, which I have connected to the boiler terminal block, the mains circuit breaker trips.
So I bought 2 relays. An industry standard 8 pin octagonal base. I have everything working on a rig on the kitchen table, except that as soon as I put 240v on the output of the relay with the relay coil energised, it trips the mains.
I need these 2 relays to stop the 240v boiler supply feeding into the other motorised valve, (or valves) which are 20metres away, even if the other relay is already energised. With the relay not energised the 240 volt from the other motorised valve(s) is effectively stopped from fouling things up.
Relay pins are 2 and 7 coil (wired as switched live and neutral), 1 and 8 power supply (wired as permanent live and neutral), 3 and 6 are normally open contacts (wired as output live and neutral), 4 and 5 normally closed contacts. Not used at present.
What am I doing wrong, or have I bought the wrong equipment? What I really need is a device which permits 240v AC to flow in one direction only.
Any help would be gratefully received
Beeches.
All 240v AC items. I am adding an additional motorised valve to a central heating system which is an S plan with 2 on/off motorised valves. Everyone tells me this is simple and needs no relays, etc, but as soon as my newly connected motorised valve puts 240 volts into it's orange output cable, which I have connected to the boiler terminal block, the mains circuit breaker trips.
So I bought 2 relays. An industry standard 8 pin octagonal base. I have everything working on a rig on the kitchen table, except that as soon as I put 240v on the output of the relay with the relay coil energised, it trips the mains.
I need these 2 relays to stop the 240v boiler supply feeding into the other motorised valve, (or valves) which are 20metres away, even if the other relay is already energised. With the relay not energised the 240 volt from the other motorised valve(s) is effectively stopped from fouling things up.
Relay pins are 2 and 7 coil (wired as switched live and neutral), 1 and 8 power supply (wired as permanent live and neutral), 3 and 6 are normally open contacts (wired as output live and neutral), 4 and 5 normally closed contacts. Not used at present.
What am I doing wrong, or have I bought the wrong equipment? What I really need is a device which permits 240v AC to flow in one direction only.
Any help would be gratefully received
Beeches.