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Type: Posts; User: jayguy

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  1. Replies
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    Feelings are sometimes good. Sometimes bad. Check...

    Feelings are sometimes good. Sometimes bad. Check the valve. Find something downstream where you can isolate and break it open and see if you get flow.

    Also, did you rotate the valve manually? I...
  2. If a BAS system is now controlling anything...

    If a BAS system is now controlling anything except giving setpoints, then all bets are off about how the unit operates and why.
  3. But it will pump like crazy for a little while!...

    But it will pump like crazy for a little while! Wheeeeeeeeeee!!
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    oh, trust me, i get it. most guys just roll a new...

    oh, trust me, i get it. most guys just roll a new belt on every year, never check alignment or change the sheaves and then complain about their customers never wanting to spend money or the company...
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    that's me!

    that's me!
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    Sorry. Should be fixed now.

    Sorry. Should be fixed now.
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    i took this video this week about why string...

    i took this video this week about why string shouldn't be used.

    https://www.youtube.com/watch?v=pIiJn4jaMrQ

    you can see how the top side of the sheave has a non-uniform wall thickness, however,...
  8. EXACTLY what pressure do you have? '-3.5" WC' or...

    EXACTLY what pressure do you have? '-3.5" WC' or '+3.5" WC'
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    Belt Hog...they made it too easy. ...

    Belt Hog...they made it too easy.

    http://www.vibralign.com/belt-alignment-tool/belt-hog/
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    Laser. Determining sheave twist is nearly...

    Laser.

    Determining sheave twist is nearly impossible with string.
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    I have seen them in catalogs....but not in...

    I have seen them in catalogs....but not in person. Bending the belt backwards shortens its life.
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    I use a belt tension and a laser alignment tool....

    I use a belt tension and a laser alignment tool. Then you won't ever have to go back. I have some belts that look perfect after over 7 years of use. Keep in mind that the belt tension tool chart will...
  13. Where are you measuring the different gas...

    Where are you measuring the different gas pressures? Natural or LP? Line pressure? Is this a 2 stage burner or a modulating burner?
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    Exactly. However, if the hot gas is piped all the...

    Exactly. However, if the hot gas is piped all the way to the evaporator, why not pipe it between the TXV and the evaporator? That's the best way anyhow. Then you an eliminate the liquid injection...
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    So liquid injection is directly into the suction...

    So liquid injection is directly into the suction line? The suction line method works (although it's not my favorite) but the liquid and the hot gas are to mix just before entering the suction line or...
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    CBR reminded me...is the HGBP valve at the...

    CBR reminded me...is the HGBP valve at the evaporator or at the compressor....it needs to be at the compressor. If it is at the evaporator, then it would definitely condense refrigerant in that line...
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    shaking...when? always? only when the unit is...

    shaking...when? always? only when the unit is running? only when the hot gas bypass is running? due to the design of the hot gas bypass, if it is not setup properly, you could be injecting liquid...
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    Don't start thinking that the customer experience...

    Don't start thinking that the customer experience always gets better in commercial...it is just different. The commercial customers may only have you troubleshoot...not repair. They might provide the...
  19. Thread: Rawal

    by jayguy
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    895

    Suction pressure based HGBP valves (or any...

    Suction pressure based HGBP valves (or any suction based capacity control) don't work very well...long term. They don't account for coils getting dirty.
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    Generically, I prefer a shell regardless of...

    Generically, I prefer a shell regardless of refrigerant or application. Well, maybe not in residential...but everything else. With the higher pressures of 410a, you do need to check the ratings.
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    Shut up and listen when the customers are around....

    Shut up and listen when the customers are around. Open your mouth and ask questions when the customers are not around. Prove you are worth teaching by asking what to read up on at night so you are...
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    keep going. you know the alphabet song.

    keep going. you know the alphabet song.
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    True. Passion is very important too. Making a lot...

    True. Passion is very important too. Making a lot of money but coming home and being a "duck" isn't going to make a happy home life....I meant a different "vowel".
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    Service typically makes more money per hour. When...

    Service typically makes more money per hour. When you work controls, you usually only work on 1 brand. This doesn't give you much room to move to another company if you want...or you are given the...
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    HEAT and TEMPERATURE are 2 different things. The...

    HEAT and TEMPERATURE are 2 different things. The amount of HEAT (BTUH) added to the airstream is constant in an electric heat application.

    The temperature rise will vary as the CFM changes. More...
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    Only do 1 circuit at a time.

    Only do 1 circuit at a time.
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    With the exception of no one wanting to carry the...

    With the exception of no one wanting to carry the red gage oil and it being a little cumbersome to carry up a 40' ladder....I miss my Dwyer. Nobody ever questioned it. Positive pressure, negative...
  28. Thread: Rawal

    by jayguy
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    That is not accurate. Sizing to that low of a...

    That is not accurate. Sizing to that low of a capacity percentage would not accomplish much in most cases.

    I should add that the sizing requirements should be of the smallest stage or the largest...
  29. Thread: subcooling

    by jayguy
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    Generally speaking, you are correct. 0F liquid...

    Generally speaking, you are correct. 0F liquid subcooling (but all liquid) and 0F suction superheat (but all vapor) is the most efficient way to run a system. The problem stems from the fact that as...
  30. Thread: subcooling

    by jayguy
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    Generically, more subcooling makes a more...

    Generically, more subcooling makes a more efficient system, however, only if you can get it for free or very low cost. Typically, it costs more money (energy) to get that extra subcooling than it...
  31. Thread: Rawal

    by jayguy
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    I haven't used a Rawal before. I always calculate...

    I haven't used a Rawal before. I always calculate my own loads and perform my own selection of part numbers based on the application. So can't comment on the brand, but to me they are a widget/part...
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    Hundreds? A few years ago, the company I worked...

    Hundreds? A few years ago, the company I worked for found a chiller that flooded and quoted $125,000 for repair/overhaul. We finished up with about $150,000 in costs. Customer got billed $125,000.
    ...
  33. Thread: Hot loop

    by jayguy
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    I just came across a chilled water system at...

    I just came across a chilled water system at 179.5F. Pump on 24/7 to keep the loop from freezing. They have ruined the chillers evaporator barrel and don't even realize it. I mentioned it, but I only...
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    NICE!

    NICE!
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    i have heard it said that a happy customer will...

    i have heard it said that a happy customer will tell 5 friends...an angry customer will tell 25 friends.
  36. pretty close to the wall...i hope you don't have...

    pretty close to the wall...i hope you don't have to change any compressors anytime soon! it looks similar to the RTWD...they are a nice chiller.
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    It is not always your fault, but it may be your...

    It is not always your fault, but it may be your responsibility.

    Tell the customer the story and give them half the difference back. It's not your unit but you feel like you should have known...
  38. Carel told me they automatically shut down at 30...

    Carel told me they automatically shut down at 30 VAC. Like I said, I don't know if Trane has adopted this feature or not.
  39. What EXACTLY is your low voltage running? I have...

    What EXACTLY is your low voltage running? I have not heard of this before on a Trane unit, but I have heard of it before on a Carel. I high running low side voltage will shut the board off to protect...
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    When I see cooked transformers, I check sizing...

    When I see cooked transformers, I check sizing and look for power harmonics.
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    You need to find out WHAT is so bad about...

    You need to find out WHAT is so bad about yours...according to that other tech.

    By the cut sheet, most things are the same between the 2 meters except Full Scale Accuracy and depending on the...
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    If the primary is burning up, put an inline fuse...

    If the primary is burning up, put an inline fuse on the primary and see what happens.
  43. Adding that much pressure drop most likely will...

    Adding that much pressure drop most likely will change the CFM quite a bit, however, you need to decide if that is a good thing or not. Maybe your system was oversized to begin with and adding the...
  44. Thread: pay scale

    by jayguy
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    I have heard that "medical" can be $300-400 per...

    I have heard that "medical" can be $300-400 per month.
  45. Thread: pay scale

    by jayguy
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    Pay is what it is when you are new. From the...

    Pay is what it is when you are new. From the sounds of it, you are very new. You may be a very fast learner and very capable, but you are new. Work your ass off and then after 1 year, talk to them...
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    I see how it's built now....that sucks worse than...

    I see how it's built now....that sucks worse than the suckage I originally thought you had!
  47. Replies
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    You wouldn't be repiping several thousand feet of...

    You wouldn't be repiping several thousand feet of hot gas line....just move it from the suction line to the evaporator line. And the hot gas line would move from the compressor to the oil separator....
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    I was doing an overhaul on an 800 ton chiller...

    I was doing an overhaul on an 800 ton chiller (that was 500 tons oversized) and saw all of those 2.5 gallon trane oil buckets lined up against the wall. 10 or 11 of them. I recommended that we...
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    I love jobs like this! Makes you look like a hero...

    I love jobs like this! Makes you look like a hero and all you have to do is follow the book.
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    I think the focus on the oil separator is a bit...

    I think the focus on the oil separator is a bit premature. I would focus on the piping and proper evaporator control first. No matter what kind or size oil separator you put in there, if you start...
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