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    Worcester Bosch 30CDi Regular & DT20 Programmer

    Hi, I want to add a DT20 programmer to a greenstar 30CDI regular boiler previously contolled by an external Horstman programmer through a 10 contact wiring centre. I can not find on WB literature site any instruction of how the wired 3 port valve, room stat and Tank stat should be wired so as...
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