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  1. rovers22

    3 point relay control

    From what I can gather 3 point relay control or hi / lo control, is used as an alternative for temperature control e.g. for the control of an air damper against full PID modulating control.
  2. rovers22

    3 point relay control

    Can anyone give me a brief overview of what 3 point relay control? I believe it may also be termed Hi / Lo control.

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