Honeywell to Horstmann

Discussion in 'Plumbers' Talk' started by gswainyboy, Nov 7, 2019.

  1. gswainyboy

    gswainyboy Member

    Hi all.I am in the process of fitting a Horstmann Centaur C27 programmer to replace a Honeywell ST699B. There is a terminal guide included but doesnt tally with the way this is wired.Once again calling on you guys to help me out.Hoping someone will match up the terminals on my pic.Thanks in advance.Graham
    Honeywell (old)
    8 terminals + L N (1&2)

    h/w Com(8) NC(7) NO(6) c/h Com(5) NC(4) NO(3)----- Coms are linked out to L incomer
    h/w - Y B c/h - - R

    C27 (New)

    6 terminals + L N (N&L)
    h/w OFF(1) c/h OFF(2) h/w ON(3) c/h ON(4)
  2. gswainyboy

    gswainyboy Member

    Im back again.Maybe I overcomplicated what I was trying to say. The Honeywell ST699B didnt have a cable connected to the C/H NC terminal hence only 3 cables (H/W NC and NO plus C/H NO) but Horstmann Centaur Plus C27 has 4 (H/W NC and NO plus C/H NC and NO) Once again,grateful for any replies.Graham
  3. kiaora

    kiaora Screwfix Select

    Can you describe the system you are trying to control ?

  4. kiaora

    kiaora Screwfix Select

    If you have a 3 port valve, you need a hot water satisfied live, ?
    This is to allow heating only

  5. gswainyboy

    gswainyboy Member

    Hi Peter. System has a 3 port valve ,yes. There are 2 cables for H/W,NO and NC but there was only 1 C/H wire which was on NO terminal but NC terminal no wire

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