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Replacing Honeywell ST699 Programmer with ST9100C Model

Discussion in 'Plumbing and Central Heating' started by williamscadwern, 4 Mar 2012.

  1. williamscadwern

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    I have a twelve month old CH/HW system that comprises a Gloworm 30 Sxi Boiler which serves a heating system on wireless thermostatic control and hot water from a cylinder via an actuated valve system and cylinder stat. The wiring to the ST699 controller appears to be in the Sundial C plan arrangement although the elements are mix and match not a Sundial pack.

    The first part of my question is can I replace the ST699 programmer with a ST9100C (which I already have).

    Secondly how complicated a re-wire is needed and where can I get a guide to re-wiring.

    Thank you
     
  2. 45yearsagasman

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