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Type: Posts; User: kdb4

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    I found a thermostat with a 'minimum run time'...

    I found a thermostat with a 'minimum run time' setting, called the Evolve, it uses Z-Wave.

    "the thermostat implements a Minimum Run Time (MRT), which keeps the HVAC system running until the MRT...
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    Robert, You can't really think about it like...

    Robert, You can't really think about it like that, that it just samples only every 30 minutes.

    I have installed several of these, it is an advanced thermostat for residential or light commercial...
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    Max SA/Return Entering Air Delta-T

    This is a question for Udarrell, Thanks for all the information you have posted. I'm still reading this page and trying to figure out what it means, from this web link:
    ...
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    Ok, I had to look up SCFM, I hadn't seen that...

    Ok, I had to look up SCFM, I hadn't seen that term before:

    The SCFM - Standard Cubic Feet per Minute - determines the weight of air to fixed or "Standard" conditions. There are several definitions...
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    So does that mean the SDP-2 TEET calculation only...

    So does that mean the SDP-2 TEET calculation only works at low altitude with air density of .075 lbs/ft3 ? Does it still work at higher elevation of 4500ft?

    It would be nice to see the equation...
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    I think I have it figured out. But please...

    I think I have it figured out. But please correct me if I am wrong.

    My fieldpiece STA2 hot wire anemometer will measure the correct velocity (and calculated CFM) at any altitude. Also the blower...
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    Thanks for the reply Jim! Along this line of...

    Thanks for the reply Jim!

    Along this line of thought, if I measure static pressure across the blower, say it is .7 inches, then look up the airflow in the manufacturers docs to get the airflow...
  8. Can I change the max blower speed on a York PC9 Afinity 9.C with ECM motor

    I have a relatively new York natural gas furnace. The Model is PC9 Affinity 9.C, model number PC9B12N060DH11A. I believe it was installed last summer.

    It has a regular LCD thermostat, not a 2...
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    I work at typically 4200 to 4600 ft elevation. I...

    I work at typically 4200 to 4600 ft elevation. I showed my STA2 to my buddy who is a test and balance engineer, he said that I need to multiply the readings from the STA2 by 1.09 at 4500ft because...
  10. Thread: pulling a vacuum

    by kdb4
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    51,625

    Thanks for the confirmation, I have spent a lot...

    Thanks for the confirmation, I have spent a lot of time reading the forum to figure things out and never ran across this. I bought the full Appion Megaflow kit with the 20 micron rated manifold, the...
  11. Thread: pulling a vacuum

    by kdb4
    Replies
    161
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    51,625

    micron gage to CRT coupler

    I found this, saw it being used in the true tech tools youtube video. Seems like the perfect adapter for the micron gauge.

    Micron Gauge Coupler by yellow Jacket 69071
    ...
  12. Thread: pulling a vacuum

    by kdb4
    Replies
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    51,625

    A correction to my post #151 experiment, in the...

    A correction to my post #151 experiment, in the second paragraph when I said I closed the C&D to pull a vacuum from the 3/8 line only, that was not the C&D valve that I closed, it was the ball valve...
  13. Nice experiment, I always wanted to try that but...

    Nice experiment, I always wanted to try that but didn't have enough pipe and fittings around to do a good test. Thanks.
  14. Thread: pulling a vacuum

    by kdb4
    Replies
    161
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    51,625

    Since I have a sman3 and a VG64, I thought I'd...

    Since I have a sman3 and a VG64, I thought I'd try an experiment. I put the VG64 on the 3/8 liquid line with a short 6" ball valve hose, then to the VG64, then to the sman3 high side with a 3' hose...
  15. Thread: pulling a vacuum

    by kdb4
    Replies
    161
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    51,625

    I have a C&D CRT and thought I'd try removing the...

    I have a C&D CRT and thought I'd try removing the valve core on my last evac. So I recoverd the refrigerant ok with the cores in and broke the vacuum from the recovery machine with a little...
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    I dont' have a blanket and I will probably get...

    I dont' have a blanket and I will probably get one. But I was thinking maybe you could shut off the condenser liquid line service valve on the condenser to pull refrigerant from a recovery tank?
    ...
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    I figured it out.... I was getting frustrated...

    I figured it out....

    I was getting frustrated trying to pull a vacuum with the robinair 15434, I had a VG64 micron gauge and also bought an sman3 and I couldn't pull a deep vacuum under about 1000...
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    I used the atmospheric pressure calibration...

    I used the atmospheric pressure calibration button to recalibrate it, that has solved the problem.
  19. Thread: pulling a vacuum

    by kdb4
    Replies
    161
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    51,625

    I've seen the tree, it looks nice. I had a...

    I've seen the tree, it looks nice. I had a problem with my robinair 15434 blankoff/isolation valve leaking. I called robinair support and they suggested the o-ring repair kit, so I got that and...
  20. Thread: pulling a vacuum

    by kdb4
    Replies
    161
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    51,625

    Thanks for the link to the vacuum hoses! Can...

    Thanks for the link to the vacuum hoses!

    Can you blankoff the hoses at your vacuum pump and hold the vacuum, ie, the hoses dont premeate like the charging hoses do, or do you have to blankoff with...
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    Thanks, I updated the CP which is Salt Lake City....

    Thanks, I updated the CP which is Salt Lake City.

    You're right on the CFM, I looked it up and its just what you said about .3" and 2000CFM. I didnt' think it dropped off that quick, to 1625CFM at...
  22. Thread: pulling a vacuum

    by kdb4
    Replies
    161
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    51,625

    Are there any vacuum rated manifold gauge hoses...

    Are there any vacuum rated manifold gauge hoses that also work for a vacuum, or am I looking for something that doesn't exist?

    I can find the black 3/8 to 3/8 quick connect hoses, but I can't find...
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    Thanks for the clues, You mean a 5 ton coil...

    Thanks for the clues,

    You mean a 5 ton coil and a 4 ton condenser? The coil is oversized by 1 ton, but its in the desert so low humidity and not a lot of need for latent cooling unless its...
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    Did anyone find an answer to this? I have a 4...

    Did anyone find an answer to this? I have a 4 ton condenser, 5 ton coil, no txv, R22, has a similar problem:

    IDWB = 60.7
    ODDB = 82.6 (late in the day)
    Targer SH on my sman3 is 7.8

    Vpressure...
  25. Thread: new member here

    by kdb4
    Replies
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    I used to find my way here from google searches...

    I used to find my way here from google searches looking for information. I joined and now spend way too much time reading threads here. Always finding new and interesting things!
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