Wiring for Vaillant Ecotec 438

12 Mar 2008
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United Kingdom
Hi, I'm after advice on wiring for an Ecotec 438 boiler, coupled with a Drayton Lifestyle heating control pack (mid position valve) but with a Honeywell CM907 room stat. Based upon the given Drayton circuit the standard RTS1 room stat is wired to terminals 2,4,5 on the JB and the boiler is wired to terminals 1,2,3,7 (L,N,E and switched?). Can someone please confirm that for the Honeywell stat I should wire to 2 (neutral) and 5 (switched)? Similarly should the boiler be fed from the earth, live (via programmer) and neutral with switched from termional 7 on JB to terminal 4 on the boiler?

many thanks
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