re: fitting digistat +3 to Vokera Linea 24

[alexthompson]

Hi

I have a Drayton Digistat+3. I want to fit this to a Vokera Linea 24.
I have attached the wiring diagram of the Linea PCB, and the wiring diagram of the Digistat. Can anyone confirm what wires should go where.

Digistat

Vokera Linea

Many thanks

 

[heatingman]

do you have the following. An existing room stat, a time clock, if so internal to boiler or external. Basic electrical knowledge.?

 

[alexthompson]

hi.

yes I have electrical knowledge.
i currently have no external stat, just an internal time clock.
the time clock is currently connected to = and second TA, with a link between = and first TA.

 

[gas4you]

Does this current time clock actually work? Sounds like everything is bridged out from your description

I would connect the Digistat terminals 1 & 2 to the TA terminals as the boiler wiring diagram as this appears to be just a switch.

 

[alexthompson]

Yes the clock currently works. I figured simply connecting 1&2 to the existing = & TA leaving the link between = & first TA would be fine. The current timer is a 2 wire system, as this Digistat appears to be.

 

[alexthompson]

This is another diagram for the Linea Manual, may shed some clear light on the wiring.

 

[alexthompson]

I connected the Digistat+3 to the Ta terminals, would anyone have an idea why when the power is turned off at the boiler, the Digistat seems to keep frying the PCB control board on the boiler. Would it be required to take the batteries out the Digistat when the power is turned off at the boiler, or a switch to be installed between the Digistat and boiler to also turn off when the boiler is powered off. The Digistat is powered by 2 batteries, no mains supply. What would this suggest to anyone, I've went through 2 PCB control boards, and they cost a small fortune.

Cheers

 

[alexthompson]

Could the PCB be not earth correctly. Not sure if this is a stupid suggestion?
Is it possible to test earthing if this is possible with a multimeter?

 

[heatingman]

Have you tried putting things back to original, ie: before this adventure?
Does it work OK now? If its ok I'll do a simple to follow drawing to wire it all up

 

[alexthompson]

Everything is back to original now, manual time clock works.

I look forward to the diagram. Any ideas why the Digistat would fry the PCB board when the power to the boiler is turned off?

 

[heatingman]

other than incorrect wiring cant answer why boards where fried. try the following sequence, if you cant make sense I'll do a diagram but they take me yonks.

The following relate to term strip inside boiler.

N.....neutral input from fused spur.
N.....neutral to integral clock(blue) and digistat back plate N term
L.....240v input from fused spur.
L.....240v to intgral clock (brown) and digistat back plate L term
TA...black wire from timer
TA...wire to digistat back plate term 1
=...wire from digistat back plate term 3 & black wire from timer

there must not be any other link wires.

John

 

[alexthompson]

John

The Digistat is battery model, so no L or N present.
I also want to remove the internal timer clock, as Digistat+3 is room stat and time control.

Would it not make sense to connect C from Digistat to =. Leave the link between = and TA(1st), and connect ON from Digistat to TA(2nd) on PCB?

When the power is turned off to the boiler, the power is obviously still on to the Digistat as it's battery powered. It seems when the Digistat attempts to fire the boiler when the boiler is turned off, the boiler PCB control board blows and needs replacing. Would this not suggest the boiler is not grounded correctly or is it always necessary to remove batteries from Digistat when the power to the boiler is turned off?

Hope that all makes sense.

Cheers

 

[heatingman]

sorry for being a total spanner I mis-read your post and for some reason thought you were talking RF digistat, sincere apologies, I'll be back in a mo.

 

[heatingman]

Posted: Sun Feb 17, 2008 9:33 pm Post Subject:



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other than incorrect wiring cant answer why boards where fried. try the following sequence, if you cant make sense I'll do a diagram but they take me yonks.

The following relate to term strip inside boiler.

N.....neutral input from fused spur.
N.....neutral to integral clock(blue)
L.....240v input from fused spur.
L.....240v to intgral clock (brown)
TA...black wire from timer
TA...wire to digistat term C
=...wire from digistat term on & black wire from timer

there must not be any other link wires.

Sorry about that, the batts are purely to maintain display in unit when powered down by timer

john

 

[alexthompson]

john

I want to remove the internal timer as I don't need it with the Digistat also being a timer?