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  1. Z

    Programmer Wiring

    Hi All, Can anyone help with what wires I should connect to a new Horstmann Channel plus H27XL. I have a gravity HW and Pumped CH system with room stat (no cylinder stat) Here is the existing timer Horstmann Diamond Here is the existing wiring what wires control...
  2. Z

    Electrical Problem wiring

    Hi All, Can anyone help with what wires I should connect to a new Horstmann Channel plus H27XL. I have a gravity HW and Pumped CH system with room stat (no cylinder stat) Here is the existing timer Horstmann Diamond Here is the existing wiring what wires control...
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