Evacuation Hose Size

[747ken]

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?

[Green Mountain]

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.

[smilies]

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.

[frozensolid]

Pipe your pump with copper you will see the difference.

[frozensolid]

Jerry, is that bottle of gas tied back.

[Green Mountain]

[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.

[Green Mountain]

[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?

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Yes, these come with several 3/8" ports or several 1/2" ports.
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Man, I miss doing supermarket work. Why did I quit it??? Oh yeah, there was no money in it.

Nice machine room, Jer.

[smilies]

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.

[Green Mountain]

As an owner or technician? Supermarket pays well here.

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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?????

[condenseddave]

Did that company sport Red, White, and Blue as their truck colors, Jerry?

[Green Mountain]

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.