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K

Kev2632

http://www.electric-heatingcompany....0/03/electric-boilers-tech-install-manual.pdf

Go down to page 8 of this document, you will see it asks for the contacts to fire the boiler up to be volt free, now i do finally understand i think what this means, it means that those two contacts R+P are independently volt free from the power being supplied to boiler, now what i cant understand with the way the booklet is telling you to wire the boiler up is, when wiring a normal 2x 2port valve set up, we supply either the orange or grey with 240 and the micro switch closes sending 240v down the other core, how can this boiler work when there will be no voltage at all applied to either orange or grey cores?? and is it possilbe to feed 240 volts onto one side of the R+P volt free contact at all ? and have 240 come out the side of either R+P ??

thanks again guys
 
Yes that's right, the RHS top section shows the L & N being fed into the board, then the boiler and pump relays which are volt free, can be looped off to feed the Live side and switched internally.

In the case of the boiler, the manufacturer is calling R & P volt free, as some do? But there will more than likely be a neglegible voltage to drive a 4 - 20 ma current to switch or signal a component on the pcb.

As previously commented, check the voltage with a bench meter, or short out the i/p and o/p and see if you get a function?
 
Yes that's right, the RHS top section shows the L & N being fed into the board, then the boiler and pump relays which are volt free, can be looped off to feed the Live side and switched internally.

In the case of the boiler, the manufacturer is calling R & P volt free, as some do? But there will more than likely be a neglegible voltage to drive a 4 - 20 ma current to switch or signal a component on the pcb.

As previously commented, check the voltage with a bench meter, or short out the i/p and o/p and see if you get a function?

yea i thought i was right about the underfloor heating manifold, so if i was too loop of the live side to one side of the "volt free" connections, i assume then i will take a switch wire from the side of that switch to the boiler and pump is that correct???
 
I was telling you different because I believe you are wrong (mainly because it says about 10 times do not put a voltage across) I was trying to find a link for you but could not. Do yourself a favour tomorrow and phone the tech line If I am wrong you have lost price of a phone call. On every boiler I have ever done there has been volt free and 240 side but your call.
 
I was telling you different because I believe you are wrong (mainly because it says about 10 times do not put a voltage across) I was trying to find a link for you but could not. Do yourself a favour tomorrow and phone the tech line If I am wrong you have lost price of a phone call. On every boiler I have ever done there has been volt free and 240 side but your call.
Well that other guy told me right there, so it must be true, and I've heard that's how it's done as well you can apply 240v to that volt free connections on the underfloor heating manifold
 
Kev, they'll be tears if you put 230v on those contacts. The underfloor heating has nothing to do with the boiler you're working on and just to clarify the situation (as I see it) volt free inputs (I/P) are just that, for the likes of normally closed (n/c) or normally open (n/o) contacts (basically signals provided internally) on the other hand (as found on the underfloor heating you mention) volt free outputs (O/P) are normally open (n/o) contacts for you to supply a voltage (in this case 230v) to feed whatever that needs feeding (can't be bothered going back and having a look, but could be a fan, light, pump etc!)
I hope that makes some sense.
So take the advice given before you damage anything!
 
I was browsing about the internet there, and i noticed you could use a relay to provide volt free contacts to a boiler how does that work? when there is 240v supplying the coil ???
 
Voltage free contacts is a term given to contacts which you apply your own voltage signal, or signal or 4-20ma etc.
Voltage free contacts as in a relay or microswitches will be rated and shown with max amps and max voltage. IE 2amp/230v or 24volt dc/5amp etc etc.
This boiler manufacturer seems to have used unfortunate wording in their description of R and P. I read it like has already been stated and is 4-20ma (with 10 volts to carry it) or 24volt etc. Looks to me like they have had a lot of returns/faults which are site based and so the emphasis on warning after warning.
The easiest to explain it is if you think of P as power (leaving the boiler at whatever voltage) and R as return (going back to tell the boiler to go). Therefor self contained and no voltage to be applied by your wiring.
 

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