rf thermostat

[foghorn]

hi guys need some help, am wiring in danfoss wireless thermostat boiler has a link wire to remove and place 2 wires from transmitter these have to be voltage free however I am getting 3 volts across the two wires from the transmitter when not calling for heat and no volts when calling for heat and continuity when calling for heat no continuity when not why am I getting 3 volts when not calling for heat as the connections to the boiler need to be voltage free

 

[stuartcourt]

is the 3 volt coming from boiler

 

[foghorn]

no coming from the transmitter the two wires that are going to replace the link wire in the boiler 3 volts only present when not calling for heat

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reluctant to connect into boiler as it says connections must be voltage free

 

[stuartcourt]

do I take it you have had it wired but did not work properly

 

[keniff]

I thought voltage free meant its separate from the boiler and you can have any voltage switched ie you could switch 12v or 230v it's whatever you choose to switch as long as its within the contacts rating

 

[stuartcourt]

no its means no voltage applied from outside depending if open or closed contacts (I know you can apply 230 to some) but never seen that on a boiler but 3 volt will not hurt

 

[foghorn]

not connected into the boiler however it seems to be doing what is required as when calling for heat two wires from transmitter =continuity turn room stat down stops calling for heat and two wires no continuity but at this point I have 3 volts across the two wires hence why not connected into boiler as it states must be voltage free connections

 

[stuartcourt]

connect it in, it will do it no harm I have never put tester across one but sounds right

 

[foghorn]

yes im thinking it sounds right just did not want to damage pcb as says voltage free

 

[stuartcourt]

that will not harm it in any way

 

[foghorn]

thanks stuartcourt will connect it in and see what happens

 

[stuartcourt]

no prob

 

[foghorn]

have a good weekend once again thanks

 

[stuartcourt]

let me know how you get on

 

[foghorn]

will do