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Pressuretrol dial setting


I am a bit confused about where the indicator is for the differential dial. I tried looking at the manual but doesn't say much about it. This pressuretrol has a cut-in setting. Thanks.

Link to photo.


  • SteamingatMohawk
    SteamingatMohawk Member Posts: 1,007
    If you look closely at the area under the screw on the right, you should be able to see a vertical line and the letters "DIFF" to the right of it. It's difficult to see, because it is almost the same color as the switch body. You might have to shine a flashlight at different angles to actually see it. Yours is set close to 1.

    Be aware that PA404A pressuretrols are notoriously inaccurate and Honeywell/Resideo won't do anything about it. I traded emails with them and got no satisfaction.

    Look around HH and youtube and you can read about it.
  • ethicalpaul
    ethicalpaul Member Posts: 5,702
    Yours looks good. You want the "1" facing you. Imagine that you are the indicator :)
    NJ Steam Homeowner. See my sight glass boiler videos: https://bit.ly/3sZW1el