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  1. #53
    Join Date
    Jul 2011
    Location
    Lehigh Valley, PA
    Posts
    447
    Quote Originally Posted by timebuilder View Post
    Amen to that.

    We used to do the Philadelphia-area chain of gas stations that are the stepchildren of a large Philly refinery with the name of that large burning object in the sky as part of the business name.

    There was a guy in charge that thought our trade should work for nothing, and that he knew as much as any tech. FINALLY, we jettisoned him, by going from reasonable estimates to sky-high prices, and he got so disgusted he stopped calling.

    Blessed relief for ALL of us!!!!
    I'm from Philly area. In fact I worked in that refinery many times when I was in the industrial gases business. I hate wearing nomax in the summer! Working the refrigeration trades in commercial settings is sooo much easier than work in any of the industrial plants whether it be oil or chemical. I don't miss it for a minute. I worked in every oil refinery from Delaware City, DE to Newark, NJ. And they are all old, especially Sun. Nuclear power plants are an entirely different animal.

  2. #54
    Join Date
    Apr 2012
    Posts
    15
    Learn the refrigeration cycle. You are working on something interesting, a VRF system. What do all the valves and chambers in that box do? Figure it out. Learn the PE graphs, pressure enthalpy, it tells you everything you need to know about what the refrigerant is doing, temperature, density, at all points of the refrigeration cycle. If you get it down pat, you will know what should be happening at every point of the system, what temps and pressures, and then be able to figure out what is not right.

    Learn motors. Why do they turn? How do they start? What do capacitors do? Motor theory. There are good books on this.

    Learn flow controls. Tx valves, all the pressure control valves and their application.

    As for skills, good piping practice. Learn to control your flame and temperature when welding; nothing like changing a tx valve, sweat, in a hole where you have 4" of room. It takes a couple of years of welding practice to be able to do it quickly and without problems.

    HVAC is about keeping people or equipment comfortable. Product refrigeration is more complex. Meat, vegetables, frozen products, all have characteristics that need to be accommodated. There are great engineering books from manufacturers that detail this.

    It takes a while to learn all this stuff. Another thing to remember is that when the freezer quits you have to fix it. Air conditioning only needs to work when there are people there. The exigencies of product refrigeration are quite different.

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