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Wiring Horstmann h27xl series 2 channel programmer

Discussion in 'Electrics UK' started by Captain77, 1 Nov 2019.

  1. Captain77

    Captain77

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    Good afternoon all,

    just a bit of advice. I am currently wiring in the above time clock and just wanted to double check wiring. I have an unvented system with 2 zone valves a room stat(hardwired) and a cylinder stat. The programmer has terminals 1. Hw on, 3. Hot water off
    4. Heating on
    6. Heating off
    (Terminals L 2 and 5 linked)

    do I have to use all these terminals and if so how do I connect the respective ones to the cylinder stat and the room stat in the wiring centre.
    I have obviously gone astray as I thought you could just use terminals 1 and 4.

    Thank you
     
  2. AndyPRK

    AndyPRK

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    are you replacing an existing system or starting from scratch.

    you have 2 motorized valves


    Normally it's

    Timer > Stat > motorized valve

    As long as you DON'T have a motorised valve with 3 pipes, the OFF terminals are not used
     
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  4. AndyPRK

    AndyPRK

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  5. Captain77

    Captain77

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    I am starting from scratch. Just regular port valves. That is how I would have wired it with just the ch on and hw on. But after speaking to Horstmann because there was no wiring diagram in the box they informed I needed to use all the terminals. Thank for the responses I will hopefully sort it on monday.
     
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  7. ericmark

    ericmark

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    S-Plan.jpg Standard S Plan, does that help.
     
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