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  1. Have any of you had to deal with a problem of...

    Have any of you had to deal with a problem of gnats entering a building through the HVAC system? Our area has a problem this year. We have some systems with 100% OSA. The prefilters are 2" pleated,...
  2. Thread: R-717

    by Learner
    Replies
    49
    Views
    6,622

    I did a little bit of NH3 work in the 70's, but...

    I did a little bit of NH3 work in the 70's, but not enough to be a pro at it.

    Are sulphur sticks still used for leak testing? Where can they be purchased?

    What are the various methods used for...
  3. Replies
    22
    Views
    18,517

    Glgto, have you personally done that experiment,...

    Glgto, have you personally done that experiment, or are you just saying that because it sounds logical? I think twcpipes may be correct. I've personally, more than once, experienced something...
  4. Replies
    12
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    1,427

    Whew!!! I just let my hair down and scraped the...

    Whew!!! I just let my hair down and scraped the eggshells off the bottom of my feet. I feel better already. Thanks for the insult R12, since you felt I needed to hear it!!! Do you always go around...
  5. Replies
    22
    Views
    18,517

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  6. Replies
    8
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    875

    Sanyo...is it like some of the other Japanese...

    Sanyo...is it like some of the other Japanese split systems that have a 24 volt DC control circuit, that is polarity sensitive. If you aren't sure, and don't want to take time to read the...
  7. Replies
    22
    Views
    18,517

    OK, and you have a cap tube system and cond ent...

    OK, and you have a cap tube system and cond ent wtr temp of 82 degrees. You've just given us some hints as to what's wrong. But don't just accept it at face value. Put your thinking cap on, as much...
  8. Replies
    22
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    18,517

    The only way a dirty coil will cause high suction...

    The only way a dirty coil will cause high suction is if it's the condenser coil that's dirty.

    If you want help troubleshooting this problem, we need a lot more info. Get every piece of info you...
  9. Replies
    12
    Views
    1,427

    OK, don't get me wrong here, I'm not really being...

    OK, don't get me wrong here, I'm not really being a smart aleck; however, I just want to say, seriously, I'm really sorry to hear that you're learning in a trade school to charge a condensing unit...
  10. Thread: Liebert piping

    by Learner
    Replies
    4
    Views
    1,897

    Regarding the inverted loop on the liquid line,...

    Regarding the inverted loop on the liquid line, there is no good reason for it. I've contacted a Liebert engineer about this in the past. Another tech who talked to Liebert told me the reason they...
  11. Replies
    7
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    4,671

    Believe it or not, York does use a filter-drier...

    Believe it or not, York does use a filter-drier in the discharge line of some of their heat pumps, to protect the reversing valve. However, when replacing them, you must make certain to use the exact...
  12. Replies
    54
    Views
    6,833

    Two months with water inside. I agree there will...

    Two months with water inside. I agree there will be rust inside. I hope it turns out ok for you. I would expect a compressor failure in the VERY near future though. Even though the liquid water may...
  13. Replies
    5
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    1,786

    Maxster, from my experience in general (not those...

    Maxster, from my experience in general (not those exact units) the amperage to the contactor coils sounds pretty high. Since all 3 of the contactor coils have high amps, it may be normal for the...
  14. Replies
    7
    Views
    4,671

    As I recall, Mitsubishi systems have a muffler on...

    As I recall, Mitsubishi systems have a muffler on the suction side, but they wouldn't be the size you describe.

    What additional info can you provide. Is this an air conditioner or a refrigeration...
  15. Replies
    42
    Views
    5,737

    The pressure change over 24 hours is generaly...

    The pressure change over 24 hours is generaly fairly minimal, in my experience, if the temp is approximately the same 24 hours later. However, sometimes I pressurize in the late afternoon when it's...
  16. Replies
    42
    Views
    5,737

    Leak testing: Positive pressure or deep vacuum micron gauge test

    I agree completely with the importance of a pressure test prior to evacuation; however, I'd like to add some comments along these lines.

    I've learned from experience that the deep vacuum test is...
  17. Replies
    42
    Views
    5,737

    Don't overlook trapped vapor in ball valves.

    ET, you're probably right about the impatience, but here's one more detail that many people are unaware of.

    The ball valve which is used to isolate the vacuum pump, traps vapor. Therefore, when...
  18. Thread: Bathroom Terms

    by Learner
    Replies
    18
    Views
    3,118

    Occasionally there's a restroom with...

    Occasionally there's a restroom with advertisements above the urinal. A recent one that I saw in a restaurant mens room was for an eye surgeon, advertising Lasik Eye Surgery. I thought it was funny...
  19. I went on a service call to a fast food...

    I went on a service call to a fast food restaurant to repair a walk in freezer that was warm. The freezer was pretty small; barely room to stand inside and turn around, with the food that was stored...
  20. Replies
    0
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    944

    On a new construction job, some of the guys...

    On a new construction job, some of the guys decided to play a little joke on an obnoxious worker who drives a Volkswagen. It was a hot summer day, well over 100 degrees. They picked up his car and...
  21. Thread: Bathroom Terms

    by Learner
    Replies
    18
    Views
    3,118

    Construction Toilet Humor On The Walls 1. No...

    Construction Toilet Humor On The Walls

    1. No Fishing: Home of the Brown Trout

    2. Life Jackets (written on box of toilet seat covers)

    3. Don't drink the water (at funnel type urinal)

    4....
  22. Replies
    1
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    917

    Hmmmm, it's really true. Be careful what you give your kids.

    I had my doubts on this until I did a search on Google
    http://www.google.com/search?hl=en&ie=ISO-8859-1&q=National+Battery+Ingestion+Hotline+
    I learned that there are about 2100 (estimated minimum)...
  23. Thread: HVAC-CAL 4.0

    by Learner
    Replies
    39
    Views
    6,294

    Immediately after his disappearance, we got a new...

    Immediately after his disappearance, we got a new member who calls himself "dikhead." At first I thought this was the new MWT, until I noticed dikhead seems quite experienced and intelligent.
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