Vaillant ecotec 28 & wiring a timer

[D90n4c]

Had a vaillant ecotech 28 pro fitted a while back and now want to wire in an old acl lp711 timer (fully working, a mate passed it onto me recently). Thought it would be an easy job but wiring diagram for the boiler leaves a bit to be desired. Any advice?

The boiler has L, N, E from a fused spur and the a bridge between contacts 3&4. The timer has 6 contacts -L, N and then numbered 1 thru 4. I have a separate 3a fused spur for the time switch.

Thanks

 

[black 31]

would need to see wiring diagram and contact diagram on back of switch can you post a photo of these but basically the normally open contacts on sw need to be wired in series (in line) with control circuit i am not familiar with that particular boiler is the on off selector incorperated in the pcb also what voltage and current rating is the timer designed to switch

 

[D90n4c]

Thanks for the reply. Due to the attachment limits I can't seem to attach photos or wiring diagrams. Below is the best i have come up with. Any help much appreciated!

Thanks,

Timeswitch wiring diagram (ACL LP711)

Full instructions for a modern LP711 can be found here:

Avenue Supplies Invensys Drayton Lifestyle LP711 7 Day Digital Single Channel Time Switch 25478 Plumbing Heating And Drainage Time Switches And Programmers (link is called: Operating Instructions for the Drayton LP range)

The wiring diagram on the back of my timer (an old LP711) differs from this as follows:

• No dotted line between the clock and the switch
• No dotted line between contacts L and 1 (although I believe I still need to provide power to contact 1).

Boiler Wiring Diagram (Vaillant Ecotec 28 Pro):

Full installation manual available here: http://www.vaillant.co.uk/stepone2/data/downloads/d7/42/00/ecoTEC_installation_and_servicing.pdf

Pg 30 for wiring.

 

[Puddle]

Link 1 and 3 on LifeStyle clock to 3 and 4 on boiler terminal block removing link.Wire L/N from spare or link back from boiler to Time Control ,maybe with 4 cord cable if you have any

 

[D90n4c]

Link 1 and 3 on LifeStyle clock to 3 and 4 on boiler terminal block removing link.Wire L/N from spare or link back from boiler to Time Control ,maybe with 4 cord cable if you have any

Thanks for this. Fine on 1st part. On second "Wire L/N from spare or link back from boiler..." can you clarify?

Also could I not just link L and 1 in the time switch and then run a single cable from 3 in the timer switch to 4 in the boiler? i.e. 3 (in the boiler) is only needed if you don't supply power to terminal 1 in the timer?

Thanks.

 

[bert large]

Yes D90n4c, the wiring in your last post should work ok.