HobbyKing.com New Products Flash Sale
 
Thread Tools
Old Mar 15, 2004, 06:03 PM
krem
Guest
n/a Posts
Small Air conditioner compressor convert to air compressor & vacuum pump?

Hello, I have a small window air conditioner that has been discharged of the
freon and was wondering if i could convert it to be either a compressor or a
vacuum pump. Possibly both? The ac was working perfectally before it was
dropped and one of the copper pipes in a radiator cracked releasing the
coolent.


Old Mar 15, 2004, 06:03 PM
krem
Guest
n/a Posts
Re: Small Air conditioner compressor convert to air compressor & vacuum pump?


"Howard R Garner" <hrgarner@innova.net> wrote in message
news:EHo5c.6692$CI3.3241@fe03.usenetserver.com...
> krem wrote:
> > Hello, I have a small window air conditioner that has been discharged of

the
> > freon and was wondering if i could convert it to be either a compressor

or a
> > vacuum pump. Possibly both? The ac was working perfectally before it

was
> > dropped and one of the copper pipes in a radiator cracked releasing the
> > coolent.
> >
> >

>
> Here are a couple of sites to look at.
>
> http://www.paragoncode.com/shop/vacuum_pump/
> http://www.berkut13.com/sucker.htm
>
> Howard Garner
> Pickens, SC
>


Good, I see that these are being used for vacuume pumps but would the air
outlet on them be enough for an airbrush if a holding tank was attached?
What kind of pressures would it be able to build up?


Old Mar 15, 2004, 06:03 PM
John
Guest
n/a Posts
Re: Small Air conditioner compressor convert to air compressor & vacuum pump?

On Mon, 15 Mar 2004 21:27:37 GMT, "krem" <news@rkremser.endjunk.com>
wrote:

>
>"Howard R Garner" <hrgarner@innova.net> wrote in message
>news:EHo5c.6692$CI3.3241@fe03.usenetserver.com. ..
>> krem wrote:
>> > Hello, I have a small window air conditioner that has been discharged of

>the
>> > freon and was wondering if i could convert it to be either a compressor

>or a
>> > vacuum pump. Possibly both? The ac was working perfectally before it

>was
>> > dropped and one of the copper pipes in a radiator cracked releasing the
>> > coolent.
>> >
>> >

>>
>> Here are a couple of sites to look at.
>>
>> http://www.paragoncode.com/shop/vacuum_pump/
>> http://www.berkut13.com/sucker.htm
>>
>> Howard Garner
>> Pickens, SC
>>

>
>Good, I see that these are being used for vacuume pumps but would the air
>outlet on them be enough for an airbrush if a holding tank was attached?
>What kind of pressures would it be able to build up?
>


These pumps are wet sump lubricated and air discharged would carry a
certain amount of oil with it.

You would have to fit an oil seperator to stop oil mixing with the
paint, the case of the pump itself acts a holding tank for a vacuum
(to allow oil mist to settle out of the gas).

HTH

John

Old Mar 16, 2004, 03:02 AM
PrecisionMachinisT
Guest
n/a Posts
Re: Small Air conditioner compressor convert to air compressor & vacuum pump?


"krem" <news@rkremser.endjunk.com> wrote in message
news:35269c4a677e652621b6f244e2de4c15@news.teranew s.com...
> Hello, I have a small window air conditioner that has been discharged of

the
> freon and was wondering if i could convert it to be either a compressor or

a
> vacuum pump. Possibly both? The ac was working perfectally before it was
> dropped and one of the copper pipes in a radiator cracked releasing the
> coolent.
>


You might ask the folks over in alt.hvac.

Good luck--else at least have some fun and report back to us...

<G>

--

SVL


Old Mar 16, 2004, 03:02 AM
PrecisionMachinisT
Guest
n/a Posts
Re: Small Air conditioner compressor convert to air compressor & vacuum pump?


"krem" <news@rkremser.endjunk.com> wrote in message
news:9ff12297bb7110c395d7729c31b839fe@news.teranew s.com...
>
> "Howard R Garner" <hrgarner@innova.net> wrote in message
> news:EHo5c.6692$CI3.3241@fe03.usenetserver.com...
> > krem wrote:
> > > Hello, I have a small window air conditioner that has been discharged

of
> the
> > > freon and was wondering if i could convert it to be either a

compressor
> or a
> > > vacuum pump. Possibly both? The ac was working perfectally before it

> was
> > > dropped and one of the copper pipes in a radiator cracked releasing

the
> > > coolent.
> > >
> > >

> >
> > Here are a couple of sites to look at.
> >
> > http://www.paragoncode.com/shop/vacuum_pump/
> > http://www.berkut13.com/sucker.htm
> >
> > Howard Garner
> > Pickens, SC
> >

>
> What kind of pressures would it be able to build up?
>


400psi high enough for you ?

--

SVL


Old Mar 16, 2004, 03:02 AM
krem
Guest
n/a Posts
Re: Small Air conditioner compressor convert to air compressor & vacuum pump?

"Gerald Ross" <gwader@netcommander.com> wrote in message
news:405663cb_5@corp.newsgroups.com...
> krem wrote:
> > Hello, I have a small window air conditioner that has been discharged of

the
> > freon and was wondering if i could convert it to be either a compressor

or a
> > vacuum pump. Possibly both? The ac was working perfectally before it

was
> > dropped and one of the copper pipes in a radiator cracked releasing the
> > coolent.
> >
> >

> It might be good to put an inline oiler on the intake side since there
> is a lot of metal rubbing against metal inside the pump. Not sure the
> oilers used on pressure lines would work, but it would be worth a try.
>
> --
>
> Gerald Ross, Cochran, GA
> To reply add the numerals "13" before the "at"
> ...........................................
> No matter who you vote for, the
> government gets elected.
>
>
>
>
> -----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
> http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
> -----== Over 100,000 Newsgroups - 19 Different Servers! =-----


What kind of oil should be used? something as simple as wd40 or a heavier
oil?


Old Mar 16, 2004, 03:02 AM
Tim Christian
Guest
n/a Posts
Re: Small Air conditioner compressor convert to air compressor & vacuum pump?

I've used freezer pumps for both pressure and vacuum. I've taken the
pressure up to 150 p.s.i.g. (the kit wasn't safe for more) but there was
plenty to go.

An oil run-back on the pressure side is essential. Also, these pumps won't
start on pressure.

PrecisionMachinisT <Precisionmachinist@hotmail.com> wrote in message
news:c36135$241gqs$1@ID-178395.news.uni-berlin.de...
>
> "krem" <news@rkremser.endjunk.com> wrote in message
> news:35269c4a677e652621b6f244e2de4c15@news.teranew s.com...
> > Hello, I have a small window air conditioner that has been discharged of

> the
> > freon and was wondering if i could convert it to be either a compressor

or
> a
> > vacuum pump. Possibly both? The ac was working perfectally before it

was
> > dropped and one of the copper pipes in a radiator cracked releasing the
> > coolent.
> >

>
> You might ask the folks over in alt.hvac.
>
> Good luck--else at least have some fun and report back to us...
>
> <G>
>
> --
>
> SVL
>
>



Old Mar 16, 2004, 06:06 PM
Old Nick
Guest
n/a Posts
Re: Small Air conditioner compressor convert to air compressor & vacuum pump?

On Mon, 15 Mar 2004 20:40:58 -0800, "PrecisionMachinisT"
<Precisionmachinist@hotmail.com> vaguely proposed a theory
.......and in reply I say!:
remove ns from my header address to reply via email

What we need here is a pressure step-down transformer

>400psi high enough for you ?


************************************************** ** sorry

..........no I'm not!
remove ns from my header address to reply via email

Does Bill Gates dream of electronic sheep?
Old Mar 16, 2004, 06:06 PM
jim
Guest
n/a Posts
Re: Small Air conditioner compressor convert to air compressor & vacuum pump?

krem wrote:
>
> Hello, I have a small window air conditioner that has been discharged of the
> freon and was wondering if i could convert it to be either a compressor or a
> vacuum pump. Possibly both? The ac was working perfectally before it was
> dropped and one of the copper pipes in a radiator cracked releasing the
> coolent.

a vacuum pump should be perfect for an old a/c unit pump.. but a
compressor i dont believe.. unless you want a low power 2-4 lbs. of
pressrue??? you can go to harbor freight and for $10 get one of those 12
volt air pumps for your car and it will run circles around the old a/c
[pump...
i made a vacuum pump to work on auto a/c units(to pump the air out )
from an old refrigerator.. took the compressor out and then cut off the
copper lines.. went to hardware store and got a 1/4 in pipe fitting and
put it on the side that pulls vacuum and its been working for the past
30 yrs.. its slow, but will pull a 28-29 in. of vacuum....
but still dont think it will work for a compressor.. i put my finger on
the other tube and you stop the air compressing without much force....
Old Mar 16, 2004, 06:06 PM
Tom Jacobs
Guest
n/a Posts
Re: Small Air conditioner compressor convert to air compressor & vacuum pump?

"krem" <news@rkremser.endjunk.com> wrote in message
news:35269c4a677e652621b6f244e2de4c15@news.teranew s.com

> Hello, I have a small window air conditioner that has been discharged of the
> freon and was wondering if i could convert it to be either a compressor or a
> vacuum pump. Possibly both? The ac was working perfectally before it was
> dropped and one of the copper pipes in a radiator cracked releasing the
> coolent.



Hi,

A small word of caution from Jim Cox's book, Electric Motors in the home
Workshop. He says :
"These units must never be used as compressors unless a reliable and
effective safety valve is fitted."
He also says that they can produce upwards of 500 psi, which could
possibly cause the cannister to burst. Normally they will not produce
this kind of pressure in us, as the unit is handling a fixed amount of
refrigerant which will liquefy before a dangerous pressure is produced.
He also suggest using Shell Vitrea 68 oil.

As the rest of the book seems quite sensible, and he appears to know
what he is talking about, I would urge caution.

Good Luck,

Tom

Nunce excretia in extractum est.



--
Posted via Mailgate.ORG Server - http://www.Mailgate.ORG
Old Mar 17, 2004, 03:01 AM
Bruce L. Bergman
Guest
n/a Posts
Re: Small Air conditioner compressor convert to air compressor & vacuum pump?

On Tue, 16 Mar 2004 05:50:42 GMT, "krem" <news@rkremser.endjunk.com>
wrote:
>"Gerald Ross" <gwader@netcommander.com> wrote in message
>news:405663cb_5@corp.newsgroups.com...


>> It might be good to put an inline oiler on the intake side since there
>> is a lot of metal rubbing against metal inside the pump. Not sure the
>> oilers used on pressure lines would work, but it would be worth a try.

>
>What kind of oil should be used? something as simple as wd40 or a heavier
>oil?


I would NOT use WD-40, that's mostly Kerosene and Stoddard Solvent.
Great for water displacement, lousy as a lubricant.

The oil to use depends on the compressor and the refrigerant that
used to be in it. If it was running R-12 or R-22, it's probably an
old fashioned mineral-oil based refrigeration oil. But if it was
running R-134, or one of the newer HCFC or HFC refrigerants, it could
be PAO or POE based synthetic oil - kinda like Mobil1...

Write down all the markings stamped on the compressor ID tag, and a
refrigeration supply house can tell you more than you /ever/ wanted to
know. (And sell you a gallon of the right type & weight oil.)

There is a reservoir inside the compressor body with a quart or two
of refrigeration oil that will lubricate the internal workings, if you
keep the oil level up. In a sealed refrigeration system that's not a
problem (since it would go around one lap and get carried back with
the refrigerant), but you aren't going to run it like that anymore...

That means you will need to figure out which of the sealed-off
tubes down low on the outside of the compressor can goes into the
crankcase area, so you can rig up a piece of clear tubing as a sight
gauge for the oil level. Drain the compressor oil out that fitting,
refill it with the proper measured quantity of oil through the suction
intake as called for on the spec sheet, and mark the "Full" level on
your new tubing sight gauge.

You need to catch any oil that gets past the rings and out in the
compressed air, which means buying a purpose-built coalescing oil
trap. But unlike a working refrigeration system I wouldn't run that
oil back to the compressor crankcase, since it will probably have
condensed water in it. Just drain it into a can of kitty litter (to
catch the oil) every few days. Top up the compressor with fresh oil
once a week, or as needed.

And be sure to run a good filter on the air intake line, or the unit
will suck in a ton of grit, get the oil filthy, and kill the
compressor in short order.

--<< Bruce >>--

--
Bruce L. Bergman, Woodland Hills (Los Angeles) CA - Desktop
Electrician for Westend Electric - CA726700
5737 Kanan Rd. #359, Agoura CA 91301 (818) 889-9545
Spamtrapped address: Remove the python and the invalid, and use a net.
Old Mar 17, 2004, 06:05 PM
speedy2
Guest
n/a Posts
Re: Small Air conditioner compressor convert to air compressor & vacuum pump?


"jim" <jim@noname.com> wrote in message news:405718CB.7FB0@noname.com...
> krem wrote:

[snip]> a vacuum pump should be perfect for an old a/c unit pump.. but a
> compressor i dont believe.. unless you want a low power 2-4 lbs. of
> pressrue??? you can go to harbor freight and for $10 get one of those 12
> volt air pumps for your car and it will run circles around the old a/c
> [pump...
>[snip]


Snag - we don't have a firm called "Harbour Freight" here in
Britain.......but you can get those 12v air pumps from car accessory shops,
but they cost an awful lot more than your 10 dollars!

More like 30 or so

Dave.p.s. this is the snag of postings to multiple groups.........what
applies in the USA isn't going to apply anywhere else, and vice versa.


Old Mar 18, 2004, 06:03 PM
Peter Parry
Guest
n/a Posts
Re: Small Air conditioner compressor convert to air compressor & vacuum pump?

On Tue, 16 Mar 2004 22:40:20 +0000 (UTC), "Tom Jacobs"
<tomjacobs@lineone.net> wrote:


>He also says that they can produce upwards of 500 psi, which could
>possibly cause the cannister to burst. Normally they will not produce
>this kind of pressure in us, as the unit is handling a fixed amount of
>refrigerant which will liquefy before a dangerous pressure is produced.
>He also suggest using Shell Vitrea 68 oil.
>
>As the rest of the book seems quite sensible, and he appears to know
>what he is talking about, I would urge caution.


I would agree - Having read that book I tried an old small
refrigerator compressor (standard black sealed unit) feeding into
just a pressure gauge. We put it behind a large earth bank and
recorded the pressure from the other side - one of the copper tubes
gave way at just under 600PSI with the compressor still going quite
happily.

--
Peter Parry.
http://www.wpp.ltd.uk/
Old Mar 18, 2004, 06:03 PM
Mike Whittome
Guest
n/a Posts
Re: Small Air conditioner compressor convert to air compressor & vacuum pump?


Peter Parry told us .............

> We put it behind a large earth bank and
>recorded the pressure from the other side - one of the copper tubes
>gave way at just under 600PSI with the compressor still going quite
>happily.
>


I think we are getting back to that splendid thread on explosives that
ran late last summer!

Mike
--
Mike Whittome - life member.
Curmudgeons International
A branch of the Flat Earth Society
Old Mar 18, 2004, 06:03 PM
Chris
Guest
n/a Posts
Re: Small Air conditioner compressor convert to air compressor & vacuum pump?


"Mike Whittome" <mike@windling.demon.co.uk> wrote in message
news:3T8bYgA8QZWAFwcA@windling.demon.co.uk...
:
: Peter Parry told us .............
:
: > We put it behind a large earth bank and
: >recorded the pressure from the other side - one of the copper tubes
: >gave way at just under 600PSI with the compressor still going quite
: >happily.
: >
I cut open casing of a fridge compressor that had stopped working with an
angle grinder and was amazed at the heavy duty quality of the compressor
inside. It must have been just stuck becasue after turning it by hand it
worked under power. I used it for many years to drive model steam engines
nice and quiet too. I threw it out when I got a proper compressor.
Chris


 


Thread Tools