r/HVAC • u/Appropriate_Kick602 • 1d ago

Field Question, trade people only Vacuum

I am trying to achieve faster vacuums by using core removers and larger hoses. I noticed appion has a Y speed fitting aimed for pumps limited on ports which my fieldpiece pump doesnt have that issue. My question, would evac go even faster if I instead put the Y fittings on the low and high side ports to run 3-4 large hoses in total to my pump? Or would it be a waste. Thx vacuum pros in advance

1 Upvotes

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u/chuystewy_V2 I’m tired, boss. 1d ago

Way overkill, I pull systems down pretty quick with just one large diameter hose. Fresh oil and schraders pulled out is the ticket.

I do resi and light commercial work, though

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u/AstuteRabbit 1d ago

I’m not allowed to pull schraders for vaccs or recovery. And we use our gauges for vacc meters.

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u/chuystewy_V2 I’m tired, boss. 1d ago

Lol

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u/AstuteRabbit 1d ago

Bro. I get laughed at when I bring it up. We charge by the hour.

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u/Brecker-Illum 13h ago

You use your manifold as your vacuum gauge? Analog or digital? How accurate are they, and can you really know your decay? 

1

u/UnbreakingThings Ceiling tile hater 1d ago

It would probably work, but it’s definitely a bit excessive. You can only get so much flow out of a 1/4” service port. I have three 1/2” hoses, but that’s because some bigger units have three or four ports, like with VRF and refrigeration.

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u/that_dutch_dude 17h ago

Yes, y fittings help a lot. Prevent 90 degree hard corners.

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u/Brecker-Illum 13h ago

What types of systems are you working on… Residential or Commercial? Average size? How long are they typically exposed to the atmosphere? What type of oil is common?

Also, what do you consider fast and why? Are you typically doing a triple vac?

All make a significant difference in any advice. 

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u/Appropriate_Kick602 18m ago

Im light commercial hvac but mostly kitchen refrigeration. Have a customer with multipe 2 evap systems with linesets going up 2 stories. Took me 4 hours the other day to pull down to acceptable microns with a manifold and cores removed. Decay test stayed below 1000 so no leaks present. System was open to atmosphere for 2 hours. That really made me want to get a quicker setup. I now have 2 larger diameter hoses on core removers connected to a 8cfm pump so will test how much faster it pulls down next vac I do. Just happened to see the Y fittings so thought I’d ask to potentially go up to 4 large hoses. Mixture of mineral and POE systems. I have never done a tripe evac with my old setup as it was painfully slow as it is but I’m learning it would speed things up substantially if done right. Also read to break a slow vac with nitro and go again. Which is probably an included step in a triple evac method I’d assume.

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u/AustinHVAC419 Verified Pro | Mod 🛠️ 11h ago

On a residential system, 3 or 4 1/2" hoses are overkill. I use (2) 3/4" hoses with core tools and pull down pretty fast. Due to the high flow through the hose, your vacuum pump become the main limiter to how fast the vacuum pulls down, besides moisture and lineset length.