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  1. What is your entering condenser water temp?...

    What is your entering condenser water temp? Leaving water temp? condenser approach? Make sure the water reg valve (assuming it has one) is not adjusted too far in the closed position. A high approach...
  2. So, the unit is undersized? If this is true,...

    So, the unit is undersized? If this is true, unloaders wouldn't really be necessary because the system would never satisfy the load quick enough to have a need for unloading. If the problem here is...
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    I believe it is ok to pump down scrolls, just not...

    I believe it is ok to pump down scrolls, just not into a vacuum. When scrolls pump down below 0 PSIG the windings are prone to deterioration, but i thought pumping them down to, say 20 PSIG, would...
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    Congrats turbo. My name is Joel, local 72...

    Congrats turbo. My name is Joel, local 72 atlanta, look forward to meeting you. I'm sure Michigan will be a whole new ballgame. 5 days of competition, probably more that we can even do, I am really...
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    Congrats on everything man. That sounds pretty...

    Congrats on everything man. That sounds pretty tough. our piping project wasnt that tough. we had to do a rectangle design, within certain measurements, and add in a muffler, some flared fittings,...
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    I will do it buddy, thanks!

    I will do it buddy, thanks!
  7. Replies
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    agross- how did your competition go?

    agross- how did your competition go?
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    Fruecrue- Looks like we'll get to meet in...

    Fruecrue- Looks like we'll get to meet in person in Michigan this year. I won the district 3 hvac contest this past week. There were a lot of sparp guys there, i was fortunate to come out on top....
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    Agross, as far as what to prepare for, It all...

    Agross, as far as what to prepare for, It all depends on who is setting things up. At my local, we had to first take a 100question test to narrow it to 6 guys. Then those 6 guys competed at our local...
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    I competed for local 72 in atlanta in the HVAC...

    I competed for local 72 in atlanta in the HVAC portion, ive had a blast so far. i won the local and state comps, next step is regionals in june. so fan they all have been 2 day events with different...
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    You actually want more than 100 psi on the...

    You actually want more than 100 psi on the system, especially if the leak is on the high side. some leaks will not show up until 250 or better. If you know where the leaks are visualy inspect with...
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    you must have enough return to equal your supply...

    you must have enough return to equal your supply and they must equate to the tonnage and cfm desired for the application. After that im pretty sure you can have as much return as you want, the...
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    Every company probably gets different discounts...

    Every company probably gets different discounts based on how much they spend with a specific supply house. I usually do just like you, but they bill me as cash on my companys account so i get the...
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    I havent seen anyone mention that some dimming of...

    I havent seen anyone mention that some dimming of lights is common and to be expected when your compressor starts. the inrush of the compressor compared to the rest of your house is probably 3 or...
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    I go to school off fulton industrail, and he is...

    I go to school off fulton industrail, and he is not lying. if the ricochet doesnt get you the hookers will! Sometimes just for fun i put NOBAMA bumper stickers on my liberal buddies cars...
  16. I prefer using 15% beacuse it had become almost...

    I prefer using 15% beacuse it had become almost universal for a/c joints. If you begin mixing different alloys you heat some until the burn and can cause real problems with the joint or the system...
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    Unions: good or bad?

    I am in Local 72 in Atlanta. Just wondering what everyone thinks of hvac or pipefitting unions in your area or in general. Good, bad, or dont care?
  18. Thread: gaskets

    by troubleshootin
    Replies
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    1,866

    i also use the kinds of loctite listed, be...

    i also use the kinds of loctite listed, be careful not to use a petroleum based grease because it can eat through a lot of gasket material. Be sure not to over tighten and be sure the gasket you are...
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    I also use the formula "toddfather" posted, it...

    I also use the formula "toddfather" posted, it seems to work great if you can measure wb. Remember that the warmer the return air the higher the superheat. We usually charge systems when they are not...
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    The Smardt turbocor i mentioned earlier, we...

    The Smardt turbocor i mentioned earlier, we benchmarked it around .22-.25 kw/ton one day. We were tinkering with the condenser water and seeing what we could get out of it. Most part load values were...
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    Most chillers only run at full load (ARI design)...

    Most chillers only run at full load (ARI design) about 1% of the time. They will be running around where yours is for the majority of its run time. To accurately calculate tonnage at a given time,...
  22. Replies
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    not specific to a 250 ton machine, but new...

    not specific to a 250 ton machine, but new technologie is around .5 kw/ton. I have a customer with a 500 ton smardt chiller with 5 turbocors, which after 2 years of getting rid of kinks gets around...
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    The York i was referencing is air-cooled though,...

    The York i was referencing is air-cooled though, the one in question has a water cooled condenser right?
  24. Replies
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    Many sales reps may double as engineers but yes...

    Many sales reps may double as engineers but yes an engineer would need to see your application to size a chiller correctly. Is it for comfort cooling or industrial process purposes? Ask about the...
  25. If the tech is supposed to provide a mojority or...

    If the tech is supposed to provide a mojority or all of their own tools, they are becoming a sub-contractor for the company. Therefore are incurring more overhead than their time and knkowledge and...
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    Is this a split system or packaged unit? And did...

    Is this a split system or packaged unit? And did you find a refrigerant leak anywhere? The crimped piping may cause those pressures, but the discharge pressure is not as likely to climb that high...
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    So thats the guy that keeps underbidding me on my...

    So thats the guy that keeps underbidding me on my sidework! I finally found him.... You get what you pay for sometimes, other times you just get a jackleg who charges you a fortune and still does...
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    It definetely sounds like there is a restriction...

    It definetely sounds like there is a restriction somewhere. Driers are a good start. If you do pull the system down check the strainer in front of the txv to make sure it is not plugged, also make...
  29. first off, i work for a union company. they...

    first off, i work for a union company. they supply us with everything that we need to do the job. that said, i have things on the truck that are mine, more convenience than anything. My buddy who...
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    ez ups are king if you can secure all 4 legs....

    ez ups are king if you can secure all 4 legs. otherwise they will be gone with the wind! i like using a tarp if the unit is tall enough. That umbrella with the magnets was nifty looking, i too am...
  31. Socialized medicine is not about providing ...

    Socialized medicine is not about providing citizens with healthcare, it is about making us more reliable on government. Anybody can get any kind of treatment at an ER and not be denied, legal or...
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    if i recall 18" round is good for 3 tons. 6"=1/4...

    if i recall 18" round is good for 3 tons. 6"=1/4 of a ton 8"=1/2 10"=1 12"=1 1/2 . This is all for residential based on about .8 in wc. Commercial is different because you have more static...
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    A lot of you are talking about the old testament...

    A lot of you are talking about the old testament scripture like we are held under that same law, but Jesus died for us that we may be under God's grace. The new testament is after Jesus came and gave...
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    ok, that makes sense.

    ok, that makes sense.
  35. Replies
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    [QUOTE=ChillerWisperer;3750482]On Tranes, you get...

    [QUOTE=ChillerWisperer;3750482]On Tranes, you get a "failure to accelerate" diagnostic when the machine starts partially loaded. The starter module has to see a drop in RLA below a certain threshold...
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    are there any manufacturers making air cooled...

    are there any manufacturers making air cooled turbocor machines successfully?
  37. Replies
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    I have seen many applications and the majority of...

    I have seen many applications and the majority of the nightmares were caused by poor contractor retrofits, not oem machines. most recently i had a smardt machine that is 400 tons with 5 compressors....
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    I agree with bald, if the install is done well...

    I agree with bald, if the install is done well they will both perform. I personally use arcoaire because i get a great deal from united, but i have not heard too much one way or the other about...
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    since the ductwork going downstairs is longer, it...

    since the ductwork going downstairs is longer, it has more static pressure loss and more air is going to go up besause it is the path of least resistance. The earlier poster talked about dampers,...
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    i didnt mean leak check with nitrogen, i meant...

    i didnt mean leak check with nitrogen, i meant "purge" while you were brazing to eliminate oxidization inside the piping. Our install guys give me the same goofy look or they tell me how they have...
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    No substitute for hard pipe and unistrut. I do...

    No substitute for hard pipe and unistrut. I do not use linesets anymore and this job is a perfect representation of why. Hope yall did a good leak check on all those joints! One more thing, that must...
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    looks like the common should have been landed on...

    looks like the common should have been landed on the terminal with the OL. I hope the breaker or fuse is sized correctly!!
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    Use a coil gun on "A" setting and backflush...

    Use a coil gun on "A" setting and backflush first. After backflushing do the same on the other side of the coil, the entering side, and be sure to rinse well. If you get good foaming all you need is...
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    I have had the motor protector spades get rusty...

    I have had the motor protector spades get rusty and loose, they caused a "cool-fail" for me. This kept the unit down though, something to look at
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    Im an apprentice still in school, only about 10...

    Im an apprentice still in school, only about 10 or so of the 40 people in my class actually are where they need to be for thier level. Out of the 10 only about 4 want to really learn the trade and...
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    Im a 4th yr apprentice in Atlanta. I think the...

    Im a 4th yr apprentice in Atlanta. I think the best thing would be to find a union contractor where you're moving and try to get on with them and then they can help you get into the local. From what...
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    Local 72 in Atlanta, we do not have any vacation...

    Local 72 in Atlanta, we do not have any vacation in the contract, you gotta get that from your Company, which if you're any good you can. The union negotiates our pay scale and pension and annuity...
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    Be sure and take all schraders out so the...

    Be sure and take all schraders out so the nitrogen has somewhere to go. If possible, the nitrogen only needs to flow where youre brazing, so on repairs there is no need to run it through the whole...
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