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Type: Posts; User: Tom Thermo

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  1. Replies
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    Howdy Icy - Just saw your text. I just...

    Howdy Icy - Just saw your text. I just downloaded a bunch of them and am trying them out - Will report back later.
    TT
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    All I want is a T6 that actually works as...

    All I want is a T6 that actually works as advertised.
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    The bad one on my bench is a Series 3 Hope...

    The bad one on my bench is a Series 3

    Hope this picture comes through, It looks really , really bad on preview
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    Damm I thought my old stock of T6's were ok but...

    Damm I thought my old stock of T6's were ok but got wrapped around the axle today with a customers failed thermostat that wouldn't energize the RV. So I said let me show you let me validate it with...
  5. Today we had the first day of class taught by...

    Today we had the first day of class taught by Capt. CO himself.
    Wow. One of the most awesome classes in any subject I have ever attended. Barr none.
    Reference material given to students is...
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    Olivero - I wish I could go to that event but...

    Olivero - I wish I could go to that event but after spending a couple grand and taking most of a week off for the NCI course I will need to lie low for a while. Are you going to the hvacschool event?
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    Combustion analysis CLASS next week

    Anybody besides me going to Atlanata for this next week? It is SW of town and I'm trying to pick a hotel. Most of them are ~~$45 - $65.

    There don't seem to be many resturaunts or bars nearby...
  8. OK anybody else going?

    OK anybody else going?
  9. Thread: Big wheel

    by Tom Thermo
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    678

    Big wheel

    Ga hvac tech-
    The local delivery guy for Wittichen says they have two of these things he calls "big wheel"

    I gotta make one or buy one - this one man install team needs help
  10. Replies
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    The Encyclopedia of Refrigerant Leak Detection...

    The Encyclopedia of Refrigerant Leak Detection lies above this post.

    The skills many of you have built up from hard work and practice are impressive and commendable. I'll keep hacking away at it...
  11. Replies
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    Thatguy said "Maybe my math is a little...

    Thatguy said
    <snip>
    "Maybe my math is a little rusty but when I run the numbers I only come up with 2.5 grams per day for a 2 lb/yr leak."

    Reminds me of the entrance exam for an engineer at the...
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    bbeerme thank you for that advice. Leak checking...

    bbeerme thank you for that advice. Leak checking is definitely an art with a little bit of science mixed in.
    saturatedpsi - solid copy
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    vin lashon - that blows my mind how some can be...

    vin lashon - that blows my mind how some can be more sensitive to one gas versus another. I believe what you are saying but just figured they all are using the same technology but it sounds like...
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    Processing data.... brain at 1/3 power... uh-oh...

    Processing data.... brain at 1/3 power... uh-oh neurons cutting ou
    t
    zzzzzz
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    Thank you thatguy - I agree.

    Thank you thatguy - I agree.
  16. Replies
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    FP SRL8 Absolute leak rate determination

    I carefully read all the literature on my FP SRL8 leak detector but missed any information on how to determine an approximate leak rate from the readings. All I can figure out is the best...
  17. Woah buford congratulations. Retirement is not...

    Woah buford congratulations. Retirement is not in my vocabulary.
  18. Cavitation on the discharge side of the pump is...

    Cavitation on the discharge side of the pump is yes sort of from excessive velocities. But the excessive velocities are caused by a sudden expansion in the pipe with a sharp edge. So the liquid is...
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    Yes all competent hvac techs are actually...

    Yes all competent hvac techs are actually thermodynamic heat transfer technical experts with specialized knowledge in two phase flow and AC and DC electronics, digital control systems, metallurgy,...
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    Yo gravity I been working centrifugal pumps and...

    Yo gravity I been working centrifugal pumps and all kinds of fluid pumping systems and fluid dynamic and thermo transfer problems in aerospace for 40 years so I know some things but your skills in...
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    I'm still trying to wear off the dumbass tatoo on...

    I'm still trying to wear off the dumbass tatoo on my forehead
    haha reminds me of "on the internet, nobody knows you are a dog" cartoon.
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    Storage shelf not shown

    I just use a box in the back(oh no i don't have any 10uF caps time to shop)
    I hate it when I'm four wheeling over railroad tracks and they all dump out :eek2:
  23. NCI Combustion Analysis Class Atlanta, GA last week of January

    OK calling all rednecks for combustion analysis training in Atlanta January 28, 29 and 30.

    I'm signed up and am hoping enough other techs will sign up so they can have the class. I think it only...
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    Now the 2" pipe size for the swimming pool...

    Now the 2" pipe size for the swimming pool heating system I worked on makes sense. At ~6 ft/sec water velocity in the pipe the flow rate would be ~60 GPM and it was running at 50 GPM at max flow. ...
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    Speaking of velocities I couldn't sleep last...

    Speaking of velocities I couldn't sleep last night and kept thinking about PHMs question. So you all probably already know this but ROT for liquid velocities in hydronic heating circuits per...
  26. BBbbeerme "they're just talking about air that...

    BBbbeerme
    "they're just talking about air that gets trapped in the impeller due to bad plumbing practices, or a bad air vent." That makes me think of vapor lock or a pump that lost its prime. (not...
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    It's amazing living with the internet these days...

    It's amazing living with the internet these days where for almost any car problem you can go to the forums and find people who compete with each other to produce the best "how to fix it" instructions...
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    It is mostly all about pressure drop. Laminar...

    It is mostly all about pressure drop. Laminar flow has the lowest boundary layer friction and the lowest pressure drop. In laminar flow the pressure drop is directly proportional to the velocity...
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    You want turbulent flow over a wing to avoid...

    You want turbulent flow over a wing to avoid separation i.e. stall. That is why you add turbulence generators on poor performing wings to extend their low speed range. A turbulent boundary layer...
  30. What causes cavitation? If your pump operates at...

    What causes cavitation?
    If your pump operates at constant speed then the best suction performance is shown on the chart for the pump and is somewhere near the best efficiency point. As you decrease...
  31. SSME LPOTP Inducer Cavitation

    (from Brennen at Caltech)
  32. Pump cavitation comes in many forms. At...

    Pump cavitation comes in many forms. At non-cavitating conditions there is still a little tip vortex vapor bubble at the blade tips. Then there is rotating cavitation, alternate blade cavitation,...
  33. To my many friends on the hvac-talk forum

    Merry Christmas - here is a photo of a drawing created by my passed friend who was an awesome artist. IT is not as clear as the original at all but hope you all enjoy it. May micky rest in peace....
  34. Thread: AHR 2020

    by Tom Thermo
    Replies
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    551

    I went all three days last year and the end of...

    I went all three days last year and the end of the second day as well as the third day I was huffin and puffin to make sure I went down every single aisle. After the first day I made a list of who I...
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    min/max - I have only seen that on flukes but it...

    min/max - I have only seen that on flukes but it is a very valuable feature. With IR camera ;yeah. IR rocks for finding moisture as well as looking at temperatures. Good job picking that up.

    I...
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    I learned how to strip the big wires when I was...

    I learned how to strip the big wires when I was in the union at the shipyard.
    Use a razor knife and roll it around the circumference where you want to cut the insulation. Do not slide it . Roll...
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    Much easier perhaps is to download an app to your...

    Much easier perhaps is to download an app to your cell phone that uses the accelerometers built into the phone. I have used this before and it shows a PSD with very clear peaks so you can pick out...
  38. The 10k devices I am accustomed to in hydronics &...

    The 10k devices I am accustomed to in hydronics & solar thermal are 10k at 77 deg F but I recall that some of the more 'exclusive' higher end manufacturers maybe have their special versions - for...
  39. Carrier 10k thermistor ?? Is it really 10k?

    Is the carrier 10K thermistor actually 10K or do they have some special 12K thermistor or something stupid like that?

    Sent from my E6810 using Tapatalk
  40. I don't get it - how can Johnstone or United...

    I don't get it - how can Johnstone or United provide an OEM Rheem or OEM carrier or OEM Trane motor?

    Isn't a rescue ECM as good or better than an OEM and at slightly less cost?

    signed,...
  41. Replies
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    Barefoot flyer -- maybe he should have pulled the...

    Barefoot flyer -- maybe he should have pulled the breaker first?
  42. Replies
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    How often should I clean coil?

    IS it time to clean the coil yet? :whistle:
  43. Replies
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    how to search on this website

    The search engine on this website is very weak bordering on useless. I search for "combustion analyzer" and get a reply like "search terms too complicated" or "too many words" which is not a whole...
  44. Well I guess I can understand it ~NOT~ like...

    Well I guess I can understand it ~NOT~
    like General motors hiding their corporate identity on all of their documentation because Cadillac and chevy and gm all share the same hardware so you should...
  45. Factory Installation Manual written by ~ANONYMOUS~

    The Rheem installation manuals for the latest split units has no mention of the manufacturer. Even on the drawing name blocks in the back there is no mention of name of manufacturer.

    Except in...
  46. Thanks Wayne I'm going to put that in my brain...

    Thanks Wayne I'm going to put that in my brain and let my three brain cells grind on it for a while. I think I'll move downstream and estimate losses for the intermediate transition. OH YEAH !!!...
  47. I just measured the ESP of my home unit and got...

    I just measured the ESP of my home unit and got 0.06 wc pressure supply side and - 0.56 return side for a total of 0.62"wc TESP

    I don't believe the supply has only 0.06 wc pressure drop but it is...
  48. If you traverse the duct measuring both dynamic...

    If you traverse the duct measuring both dynamic pressure (velocity) and static pressure then you will find variations of both across the duct. Near the wall there may be a thick boundary layer...
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    I haven't studied blowers much but centrifugal...

    I haven't studied blowers much but centrifugal pumps put out full head when running in reverse at zero flow but when you try to let it flow then the head drops right off.
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    The job that keeps taking,,, taking... taking

    The job that keeps taking,,, taking... taking
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