Wiring a Drayton Digistat SCR to a Drayton LP522

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Hi im after a little help
I want to wire in a Drayton Digistat SCR to a Drayton LP522 programmer for the Central heating current programmer wiring is shown below , I understand the L N & earth wiring from the LP522 to the SCR its just the heating wiring Im stuck on, thanks Simon
 

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  • Programmer wiring Current No thermostat.jpg
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  • Digistat Backplate.jpg
    Digistat Backplate.jpg
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If you have a conventional boiler, which it appears you do, then it should be wired at the wiring center.
 
Chris its been wired into a Worcester Bosch Green star Heatslave oil combi by the installer, its in my elderly mothers house with no wi fi eatc or else would have gone down the hive route
 

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  • Boiler Wiring.jpg
    Boiler Wiring.jpg
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What you need to do is alter the wiring, so the grey from 4 on LP522 goes to the common of the digitstat and then the heating on from thermostat goes to the LR at the boiler.
 
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The LP522
1680443493443.png
and the SCR
1680443607867.png
need the N and L connected in parallel i.e. L to L and N to N, and the wire from 4 on the LP522 goes to 1 on the SCR and a wire from 2 on SCR to 4 on the LP522 in other words in series.
 

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