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Jesus

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12+ years in the HVAC Field ........... :rolleyes:

I think some of you guys forget what I do for a living .....

www.johnstonesupply.com :lol:

so in hvac when doing a evac. it's not necessry to make sure you don't shut the pump off without isolating it from the system being evacuated, as air will be sucked backward through the vacuum pump into the system. This will defeat the entire purpose of pulling the vacuum in the first place.

Just curious as my brother in law has been doing installation not sales for over 17 years and this is what he did with my home central unit when it needed servicing.

Edited by Dave 54
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NEC is starting to become very dramatic...we still have JRL and ghostshadow as well

Keep in mind it's like favortism, it's only drama when the participant is one who you do not care for. :D

Which is cool, we are all different and cannot all play nicely together.

Edited by --Aaron--
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so in hvac when doing a evac. it's not necessry to make sure you don't shut the pump off without isolating it from the system being evacuated, as air will be sucked backward through the vacuum pump into the system. This will defeat the entire purpose of pulling the vacuum in the first place.

Just curious as my brother in law has been doing installation not sales for over 17 years and this is what he did with my home central unit when it needed servicing.

thats different what I was talking about before .

When pullling a vaccum you need to turn everything off but if your just topping it off you dont have to shut it off if anything you want it running.

What vaccum pump in the system :blink: Theres a compressor wich compresses the Refigerent into a liquid but no vaccum.

Now you do use a vaccum pummp to pump down the system but you dont have to vaccum a system with 134a when topping off.

You do have to with a 410a system

Thats great that he installs resi stuff :lol:

This is what I used to work on ....

DSCN0224.jpg

:P

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