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  1. Replies
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    If you dont mind - me too?

    If you dont mind - me too?
  2. Replies
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    Yup, your SSR uses dual SCR's, same as a triac,...

    Yup, your SSR uses dual SCR's, same as a triac, it won't work with a DC load.

    Sent from my ADR6300 using Tapatalk 2
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    Oops, maybe I misread your post(s). Are you are...

    Oops, maybe I misread your post(s). Are you are trying the resistive divider? I thought you were doing an SSR, if not my earlier post doesn't apply.
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    Are you sure the relay is not closing the...

    Are you sure the relay is not closing the contacts again? Is it possible that the output is staying closed, and that's the reason you're not getting any pulses?

    I say this because most SSR's are...
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    668

    Are the building heat valves on DDC? Maybe a...

    Are the building heat valves on DDC? Maybe a strategy to gauge building demand via valve positions? Or possibly watch the delta T, warmer return indicating low load and time to stage off (and don't...
  6. Thread: What Fuse?

    by DDC_Dan
    Replies
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    3,866

    Those are the fuses for the control transformer...

    Those are the fuses for the control transformer primary. One fuse remains, and the TX is a single-phase load, so it's still protected against overcurrent. If the transformer primary were to go to...
  7. Thread: JC ZJ12

    by DDC_Dan
    Replies
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    423

    Just curious, how is not running the low side to...

    Just curious, how is not running the low side to the fan inlet a Honeywell product issue? I have used hundreds of them, they are a simple diaphragm switch like everyone else's and have always worked...
  8. Yesturday I cudnt evin spel engineer - today I...

    Yesturday I cudnt evin spel engineer - today I ARE wun!

    btw.... welcome to the forum, BMS!
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    Is this a DIY project, or commercial? If it's...

    Is this a DIY project, or commercial? If it's something you're just experimenting with, then something like this could fill the bill:

    http://www.mydtcstore.com/ (specifically the TinyDTC)

    In...
  10. Thread: BTU's

    by DDC_Dan
    Replies
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    1,066

    I type too slow..... Sent from my ADR6300...

    I type too slow.....

    Sent from my ADR6300 using Tapatalk 2
  11. Thread: BTU's

    by DDC_Dan
    Replies
    17
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    1,066

    One BTU is the heat required to raise one pound...

    One BTU is the heat required to raise one pound of water one degree F. To use BTU as a unit of energy it is expressed as BTU per hour, or Btu/h.

    One ton of refrigeration is equal to 12000 BTU/h,...
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    Ok,here's my two cents worth. Start with the...

    Ok,here's my two cents worth. Start with the opening closed (how else will you get the two rooms to their respective temps?). Gently open. The colder air is denser, and so will tend to flow over the...
  13. Thread: psycrometer

    by DDC_Dan
    Replies
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    3,448

    Joe, the OP did not say measure, he said...

    Joe, the OP did not say measure, he said calculate. I (and others I imagine) think he is asking if the sling psychrometer (or other means of measuring WB) is needed to calculate the target SH or SC,...
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    That is very cool! I wonder what the whole...

    That is very cool! I wonder what the whole machine costs?
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    The response time is what it is, not adjustable...

    The response time is what it is, not adjustable as far as I know.
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    517

    Just the one space is doing it, but all units in...

    Just the one space is doing it, but all units in that space are? I have had issues where the space static pressure was wrong, and the differential pressure pulled air out of the wall cavity and...
  17. Replies
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    1,343

    How stupid... gotta use orange wall anchors for...

    How stupid... gotta use orange wall anchors for that wire size.
  18. For an unbalanced (120V) load the neutral carries...

    For an unbalanced (120V) load the neutral carries the exact same current the hot does...
  19. Aluminum?

    Aluminum?
  20. Replies
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    1,035

    That is just painful to watch...

    That is just painful to watch...
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    I wasn't allowed to get my license until I...

    I wasn't allowed to get my license until I already had a job and had saved enough to start paying my share of the premiums.... of course that was 38 years ago.
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    Costco - been a member since 1984. Wife had a...

    Costco - been a member since 1984. Wife had a Sams card, let it lapse in favor of Costco.
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    The tables imply it, but no one has mentioned it,...

    The tables imply it, but no one has mentioned it, there are two common 10K RTD's - type II and type III, best to use the table that matches your particular sensor. acsj's table lists them both.
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    Interesting. Usually the controls send a signal...

    Interesting. Usually the controls send a signal TO the VFD (like a speed signal), what signal is your VFD sending to the main board? Can you post the wiring diagram?
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    Could you give an example of one? I have not run...

    Could you give an example of one? I have not run across this, would be interesting to examine.
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