cross-posted from: https://lemmy.dbzer0.com/post/26703241

This diagram is from the service manual of a combi boiler. It’s a flow sensor which detects whether hot water is running, which is then used to trigger on-demand heat and switch a diverter to take radiators out of the loop.

In English, the diagram shows:

  • X ⅔ red wire (+5V)
  • X 2/2 black wire (ground)
  • X 2/6 green wire (signal)

I need to know what those fractions mean. I took the voltage measurements in this video:

I cannot necessarily trust the model in that video to have the same specs as mine. My voltmeter detected 4.68 V on the red input wire showing that the sensor is well fed. The green “signal” wire is supposed to be 0 V at rest and 2 V with water running (or I think the reverse of that is used in some models). In my case the green wire is ~1.33 V at rest and ~0.66 V when water is running. I need to know if these readings are normal as I troubleshoot this problem.

update

@synapse@lemmy.world gave the right answer. Someone in another cross-post helped solve the underlying problem.

  • Synapse@lemmy.worldEnglish
    1·
    3 months ago

    I believe “X #/#” are references that you will find on other pages of the schematic to indicate where these cables are connected too. Not so sure tho …

    Edit: indeed the letter X is standard designation for connectors and pins, and the numbers are references to cables.