24volt system ?

[stidge]

Hi all, here's the score
Gloworm 35 store combi boiler with 24 v controls. Danfloss single channel clock and digital stat.
I have taken perm feed L/N to clock. From boiler 24v to number 1 on clock . Number 4 on clock to A at stat. C from stat connected through back to boiler RT.
Hope that's clear but it's not working as should. When I turn down stat low the boiler fires ???????( I've tried reversing polarity on 24v at boiler ) please help stressed (or just stupid) man scratching head. cheers

 

[telectrix]

sounds llike you've got N/C and N/O on stat reversed.

 

[stidge]

That's what I thought mate but have wired it to schematic ! Will try anyway tel , much appreciated

 

[telectrix]

what's the model number of the stat?

 

[stidge]

I'm not at job yet tel ! I think it's DC something it's a danfoss 24v digital !

 

[telectrix]

get you meter on the switching contacts in the stat, see which comes live when you turn it up.

 

[stidge]

Can't meter with stat on, have taken off and getting 24v at A which I should mate, trying to get thro to tech helpline!!!!! The stat is Honeywell DT90E

 

[stidge]

Thanks for all your help tel! Turns out even though on the back of the stat it shows A & C as no and nc ! It's actually A & B we use !!!!!!! Honeywell ????