"volt free contacts"

[onlyfitidealboilers]

hello guys

iv just fitted a boiler an it requires volt free external controls

what does this mean?? cheers

 

[ricicle]

It means that some external switching component has contacts that are not electrically connected to that component. This means that the supplies/voltages are kept apart.

 

[spraggo]

hello guys

iv just fitted a boiler an it requires volt free external controls

what does this mean?? cheers

The time switch contacts must be volt free, in other words you do not link live to the common contact on the time switch. If the original boiler was not volt free then there will bew a link between L - C on the time switch which you need to remove.

 

[onlyfitidealboilers]

hello pal

can you pls go into detail a bit just so i can understand it fully!!

sorry to be a pain!

 

[Adam_151]

Its saying it wants a pair of switch contacts without voltage present, e.g., you could wire up a standard light swith to it and boiler would come on and off with the switch. Be a little inconvient though

Most programmers can present the rely contacts in this way (without voltage present), but some may be set up with a link between common of the rely and the live that drives the motor (or electronics), this is for boilers which want a switched live as opposed to volt free, if you want volt free you may have to remove this if it is supplied connected in the programmer

 

[martinxxxxxx]

hello guys

iv just fitted a boiler an it requires volt free external controls

what does this mean?? cheers

Without being technical it means that the boiler has two terminals on it to contol when it starts. If you link the terminals together the boiler will start and stay started until you remove the link.

What Volt Free Means is that if you conect something else to those two terminals like a controller or timer. The controller or timer must not send any voltage to the boiler, in other words it must be a relay output with no link to live or negitive or earth.

Hope this make sense

Martin

 

[onlyfitidealboilers]

Thanks adam,

if your using the power out of the boiler then surely that wont send 230v to programmer

it must leave the boiler volt free to come back volt free??

cheers

 

[ricicle]

Thanks adam,

if your using the power out of the boiler then surely that wont send 230v to programmer

it must leave the boiler volt free to come back volt free??

cheers

The voltage from the boiler will be switched by the timer and sent back to the boiler but will not be connected in anyway to the voltage that powers the timer.
If you understand how relays work just think of the programmer as a relay, with its timed part being the coil and the boiler connected to its switched contacts.

 

[onlyfitidealboilers]

got it

thanks very much chaps il thank you all!!

 

[onlyfitidealboilers]

here is one for you!! with the link in position there was 240v.

if it sends 240v across the link then what stops it from putting 240v on to the common on the programmer!

 

[Adam_151]

There is volatage on the contactor contacts of the programmer, supplied by the boiler... whether this is 240v or some other volatage is not really important and may vary. The contactor contacts are not connected to anything else within the programmer. What you must ensure is that you are presenting the contacts of the contactor cleanly to the boiler, and not connecting 240v onto them from the supply to the programmer