heating circuit relay

[davesparks]

That's fantastic! Thank you so much. I shall be sure to include a pic in future :behead:

Pay very careful attention to what darkwood has said though, he really knows his stuff in this area, and if he advises walking away then I'd do exactly that.
Even without his knowledge it's obvious that there are some serious issues to be addressed in that picture,

 

[a-z electrics]

Taking one look at that picture, I would say walk away unless you wish to become liable for a non-conforming control set-up. The fact the din-rail is subject to heavy corrosion means this kit isn't IP rated for its environment plus it looks rough, unless you are going to address these issues I would consider your position here.

You know, I fully agree with you. I initially thought it was OK but the more I think about it, the fishier it gets. I shall write my opinion for the client so she has it in writing..

 

[a-z electrics]

Pay very careful attention to what darkwood has said though, he really knows his stuff in this area, and if he advises walking away then I'd do exactly that.
Even without his knowledge it's obvious that there are some serious issues to be addressed in that picture,

Agreed!

 

[PEG]

That relay set-up,is not a means of achieving the control of your two heating elements. The DPDT gives you the possible facility of alternate or paired control,but without a fail-safe position. If,indeed your heating loads require to be interlocked,so as to prevent both loads being energised simultaneously,and,a fail-safe position,this relay will not achieve that.

 

[a-z electrics]

That relay set-up,is not a means of achieving the control of your two heating elements. The DPDT gives you the possible facility of alternate or paired control,but without a fail-safe position. If,indeed your heating loads require to be interlocked,so as to prevent both loads being energised simultaneously,and,a fail-safe position,this relay will not achieve that.

OK but if it provides alternate heating then that's its purpose, yes? To prevent both heaters being on simultaneously. There is a control knob on the bath stat which is accessible, and a heater switch which energises both heaters but via the relay..

 

[HandySparks]

Ha ha! With a photo in the op, this thread could have been cut to about 2 posts.

 

[a-z electrics]

Ha ha! With a photo in the op, this thread could have been cut to about 2 posts.

Yes alright!! I've learned my lesson. :83:

 

[Pete999]

What about acknowledging PMs?

 

[a-z electrics]

What about acknowledging PMs?

Yes thankyou for your input too. We got there I'm the end and learned a few things along the way. Which is always worthwhile :dead:

 

[GEOFF S]

Hi

There are proper units out there for this, fully programmable, try a Horstman electronic 7, don't bodge it.

Cheers

 

[PEG]

OK but if it provides alternate heating then that's its purpose, yes? To prevent both heaters being on simultaneously. There is a control knob on the bath stat which is accessible, and a heater switch which energises both heaters but via the relay..

You stated that both heaters should not be switched on,at the same time,the only way this could be achieved with that particular relay,would be to have one on the N/O contacts,and one on the N/C contacts.

This makes the latter,switched by default,and not fail-safe,ie with no switching input,or loss of switching control,it will remain on.

This may be important,depending on a whole raft of circumstances,of which we know not.

I realise that on occasion,folk ask a simple question regarding the sourcing of a component,and it turns into an inquisition of sorts...

I reckon it would be similar,on a medical forum,where a chap asks "Where is the best place to buy scalpel blades?" before having a bash,at a circumcision,on an unknown individual :lol:

 

[a-z electrics]

You stated that both heaters should not be switched on,at the same time,the only way this could be achieved with that particular relay,would be to have one on the N/O contacts,and one on the N/C contacts.

This makes the latter,switched by default,and not fail-safe,ie with no switching input,or loss of switching control,it will remain on.

This may be important,depending on a whole raft of circumstances,of which we know not.

I realise that on occasion,folk ask a simple question regarding the sourcing of a component,and it turns into an inquisition of sorts...

I reckon it would be similar,on a medical forum,where a chap asks "Where is the best place to buy scalpel blades?" before having a bash,at a circumcision,on an unknown individual :lol:

Absolutely agree.. An educational exercise indeed! BTW which side of Manc are you, blur or red?

 

[PEG]

Never been a follower of that carry-on...me dad was a press photographer all his working life,and i used to tag along to the odd match,as a kid,carrying his gear,and sitting behind the goal.

Experiencing the stuff thrown at the pitch,including darts,crisp bags full of excrement,oranges with razor blades stuck in them,etc,i decided to pursue endeavours possessing a crowd of higher acumen.....and went with me pal,to watch his dad fight in Gypsy bare-knuckle matches:smartass:

I know i won't win any applause on here,for my opinion on this subject,but football is a great game for kids...after that,it's just an excuse for excess and violence.

Rugby,climbing are better sports...but nothing beats guddling :lol:

 

[a-z electrics]

Well that's unusual but OK with me.. When I grew up in Manchester you were one or t'other :dizzy2: