Honeywell V4073A 3 Port Motorised Valve Wiring question

[Reddwarf4ever]

Hi
i checked the wiring colours are the same from the junction box to the current 3 port valve, as the new one. But although I could turn off the house mains, I would prefer not to, is it easy to tell if the wires are live, using a multimeter, ? Have an isolation switch, but not 100% sure if that isolates everything relating to this valve.

thanks

 

[exedon2]

If you have a multimeter very easy take off junction box lid check live supply to box (makes sure multimeter is working!)
Switch of isolator take out fuse check nothing is live in junction box.

 

[Reddwarf4ever]

If you have a multimeter very easy take off junction box lid check live supply to box (makes sure multimeter is working!)
Switch of isolator take out fuse check nothing is live in junction box.

Don’t know which colour us live don’t I need a neutral yo check for voltage ? Which colours do u use with the MM

 

[Aquarius]

Current guidance of dead testing is to use approved test equipment, a multimeter is no such equipment. Should be a test lamp or 2 pole voltage tester, including testing equipment on a known source.

 

[Reddwarf4ever]

Current guidance of dead testing is to use approved test equipment, a multimeter is no such equipment. Should be a test lamp or 2 pole voltage tester, including testing equipment on a known source.

This is amazing, all I want to do is see if the wires are safely isolated so I can replace the 3 way valve......as I can’t find an answer I will just turn the mains off, really hoped to get a reply such as check wire colour A with wire colour B and check if voltage zero......

 

[Aquarius]

This is amazing, all I want to do is see if the wires are safely isolated so I can replace the 3 way valve....as I can’t find an answer I will just turn the mains off, really hoped to get a reply such as check wire colour A with wire colour B and check if voltage zero....

I could tell you which wires to check, but as you mention “safely isolated” it would be a breach of h&s regulations. I wouldn’t want you to injure yourself or worse. This is why such procedures and regulations exist, sorry if it’s not what you want to hear.

 

[Ben-gee]

Also in a wiring centre like this - if someone’s done something odd (more often than you might think) , then you could test for dead but power could come from another source as you are working on it...

 

[Reddwarf4ever]

Ok......thanks . . . . . . . . . . .

 

[Murdoch]

Your boiler / wiring should have a single point of isolation, normally a fused spur ..... occasionally I find systems with 2 supplies which isn’t good

you need a way to check the wiring is isolated

 

[Reddwarf4ever]

Ok thanks . . . . . . . . . . . . . . . . .

 

[Reddwarf4ever]

A follow up question, I changed the Honeywell 3 port valve, I turned the house mains off ‘ just in case’ & all went well......the problem with the 3 port valve I replaced, exactly same model, was that it often got ‘ stuck’ when being asked for heating, the hot water side was fine. I found that when this happened, I pushed the lever down fully ( some resistance felt) it then started the boiler / pump etc and worked fine for several hours, but maybe when the room stat was satisfied and then went to demand again the problem happened, not sure. But is this a sign of a faulty motor, / solenoid, can it be fixed, or is it indeed worth trying to fix....just want to know if it should go in the bin or not....will keep the base, as I think it’s the head only at fault.....thanks