Low voltage switching

[PEDANTICVINDICTIVEMAN]

On motorised valves such as honeywell seimens ect, on 2 port or 3 port valves, are the internal micro switches capable of low voltage switching as for say looping of the room stat on the PCB on say a combi ?

 

[picasso]

low voltage switching will work on 2 ports but not on 3, I have done this with a boiler, the manufacturer recommended this set up but I cant remember who it was

 

[DP]

While following does not answer PVM's query, mains voltage on a lot of PCBs is used to switch low voltage by useing opto isolators.

If three port is to be used to switch low voltage, a relay would be needed.

 

[mysteryman]

I think the end switch on a 3 port diverter valve may be volt free - if it has one. By 'diverter' it means a two position as distinct from a mid position valve. These are known as a W Plan. Check with the Honeywell website.

Certainly, you can't do this with a mid position valve, but you can with a 2 port.

 

[picasso]

afaik w plan divertor valves are only 3 wire (havent seen a 5 wire) are you confusing it with a c plan valve?

 

[PEDANTICVINDICTIVEMAN]

Ok guys, so volt free switching will work on a 2 port but not a 3 port, have I got that right ?

 

[picasso]

yep spot on, if you want to use a 3 port valve you need a relay on the 240v on the orange as dp already said.

 

[PEDANTICVINDICTIVEMAN]

Thanks, I was curious

 

[5TIMES]

i wired my boiler 240v on the brown from cylinder stat
low voltage power out off boiler on to grey. hence low voltage on orange
saves blowing the pcb

 

[mickyg]

do it all the time with atag Qs when using weather comp and generic controls.

 

[ChrisR]

If you're being pedantic, 240V IS low voltage.

 

[ChrisR]

[quote-"5times"] i wired my boiler 240v on the brown from cylinder stat
low voltage power out off boiler on to grey. hence low voltage on orange
saves blowing the pcb [/quote]

EH??

do it all the time with atag Qs when using weather comp and generic controls.

WOT?

WIth which valves?? and.. I'm sure you guys know what you mean, but you're making no sense to me at all

 

[PEDANTICVINDICTIVEMAN]

i wired my boiler 240v on the brown from cylinder stat
low voltage power out off boiler on to grey. hence low voltage on orange
saves blowing the pcb

Is this on a 2 port or 3 port

 

[5TIMES]

2 port.

you are not useing the low voltage to move anything are you
all you are doing is puting the low voltage on the grey so the grey can put its on the orange