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  1. #1
    Join Date
    Oct 2003
    Location
    Southern California
    Posts
    303
    Question from a hvac student:

    I have a Brute charging manifold that uses a 3/8" charging/evacuation hose. The systems I've worked on all use 1/4" fittings on the service ports. In order to use this larger hose, I'd have to use a 1/4 to 3/8 adaptor fitting. But wouldn't that cause a restriction, defeating the purpose of the larger hose? Could it be that some large systems use 3/8 fittings on their service ports?

  2. #2
    Join Date
    May 2001
    Location
    Bennington, Vermont U.S.A.
    Posts
    13,864
    You use a 3/8" OD hose when pulling a vacuum because the 3/8 hose has more VOLUMN. Volumn is not the same a pressure drop. It is true that the 1/4" port creates a pressure drop but in one little spot. Most valves and fitting offer a pressure drop. Totally they could effect the volumn.

    You can pull a vacuum 8 times faster with a 3/8 hose over using a 1/4" hose.

  3. #3
    Originally posted by 747ken
    Could it be that some large systems use 3/8 fittings on their service ports?
    Yes, these come with several 3/8" ports or several 1/2" ports.


  4. #4
    Join Date
    Jan 2004
    Location
    Earth
    Posts
    4,879
    Pipe your pump with copper you will see the difference.
    A Diamond is just a piece of coal, that made good under pressure!

  5. #5
    Join Date
    Jan 2004
    Location
    Earth
    Posts
    4,879
    Jerry, is that bottle of gas tied back.
    A Diamond is just a piece of coal, that made good under pressure!

  6. #6
    Join Date
    May 2001
    Location
    Bennington, Vermont U.S.A.
    Posts
    13,864
    [QUOTE]Originally posted by jerrycoolsaz
    [B]
    Originally posted by 747ken
    Could it be that some large systems use 3/8 fittings on their service ports?
    Yes, these come with several 3/8" ports or several 1/2" ports.

    Man, I miss doing supermarket work. Why did I quit it??? Oh yeah, there was no money in it.

    Nice machine room, Jer.

  7. #7
    Join Date
    May 2001
    Location
    Bennington, Vermont U.S.A.
    Posts
    13,864
    [QUOTE]Originally posted by benncool
    [B]
    Originally posted by jerrycoolsaz
    Originally posted by 747ken
    Could it be that some large systems use 3/8 fittings on their service ports?
    ----------------------------------------------
    Yes, these come with several 3/8" ports or several 1/2" ports.
    -----------------------------------------------
    Man, I miss doing supermarket work. Why did I quit it??? Oh yeah, there was no money in it.

    Nice machine room, Jer.

  8. #8
    Originally posted by benncool

    Man, I miss doing supermarket work. Why did I quit it??? Oh yeah, there was no money in it.
    As an owner or technician? Supermarket pays well here.

    Originally posted by benncool
    Nice machine room, Jer.
    That was the first one I did myself.

  9. #9
    Join Date
    May 2001
    Location
    Bennington, Vermont U.S.A.
    Posts
    13,864
    As an owner or technician? Supermarket pays well here.

    -------------------------------------------

    Over the past 40 years I pretty much got into all aspects of this heat transfer business. When I was a technician I made good money in markets. I still love piping as the most favorite thing to do.

    But as a contractor I have found that you can make a lot more money in the HVAC end of this business. We are particularly good at remodel work both commerical and residential. There is a big demand for this in our area. If a developer wants to renovate a space he gets the green light. If he wants to build new then he gets all kinds of red flags.

    They built a new Aldi's market here in town. I put a price in on it just for old time sake. Some company from Syracuse NY (150 miles away) got the job. WOW, HUH?????

  10. #10
    Join Date
    Sep 2001
    Location
    East Stroudsburg, PA
    Posts
    13,215
    Did that company sport Red, White, and Blue as their truck colors, Jerry?

  11. #11
    Join Date
    May 2001
    Location
    Bennington, Vermont U.S.A.
    Posts
    13,864
    Originally posted by condenseddave
    Did that company sport Red, White, and Blue as their truck colors, Jerry?
    It was ABC Refrigeration! They did a nice job so no sour apples from my part.

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