Our old Electra F/F is dying and I want to dismantle it to use the
compressor for "other purposes"...
(Before you say "you can't do that, you have to give it to a
professional... etc" I will remind you that I am living in Turkey,
unfortunately the CFC harmful gases will go to the atmosphere if it
give it to a scrap merchant or do it myself...)
What is the best procedure to relieve the pressure in the system
without gassing myself or causing a fountain of freon? (or whatever
refrigerant it uses...) small hole with pin or cut a pipe and run?
(I have seen the compressors used to pump up car/bicycle tyres before
now and a search on the net gave some hints about this as well)
You just turn your head and cut one of the pipes (outdoors).
Walk away until it's finished hissing, and you're done. I've
done this at least half a dozen times in the past.
Make sure the compressor is upright when you do this, and that
it has been upright for a couple of hours (with the main heat
exchanger above it). Otherwise you're likely to lose all the oil
along with the refrigerant.
Some fridges used ammonia as the refrigerant. When I was at
school, I once removed the compressor from a fridge containing
ammonia. That was an unpleasant experience. Just make sure you
do it outside, away from other people/animals etc.
On 22 Nov 2003 16:16:07 GMT, email@example.com (Huge) wrote:
IIRC an old book of how things work that my father has, ammonia was
used as a refrigerant in early compressor fridges as well as in those
which operate(d) with a heat source. I am sure that I can also
remember there being gas fridges in the past which presumably used a
heat source in some way, but I can't think for a moment what the
principle of operation would be.
To email, substitute .nospam with .gl
They use the heat of solution of ammonia in water. A heater drives the
ammonia out of solution from the water, a radiator cools it, convection
causes the water to circulate back into the frig, wherre the ammonia is
redissolved and the heat of solution absorbed from the frig interior.
Entirely silent and no moving parts.
My parents had one for 30-odd years until they emigrated to the USA
and left it behind.
"The road to Paradise is through Intercourse."
The uk.transport FAQ; http://www.huge.org.uk/transport/FAQ.html
Not only in the past - very much in the present for caravanners!
Caravan fridges invariably work on the absorption ("Electrolux") cycle
principle - rather than having compressors - and usually have 3 alternative
sources of heat:
1. Mains electricity
2. 12v DC (for use when travelling only - and powered by the towcar's
3. Calor Gas (for use on site when no mains electricity is available)
On 22 Nov 2003 06:13:04 -0800, firstname.lastname@example.org (Abdullah Eyles)
The compressors are very useful - but make sure you fit a pressure
relief valve, although their capacity is low they will happily go up
to inordinately high pressures (many hundreds of PSI) before
email@example.com (N. Thornton) writes:
Having learned how liquid nitrogen is made in O-level physics,
I recall trying to get hold of one to make some. It would
probably have never worked, but I never got to try.
I've got a freezer which is on it's last legs (has to wear a
large incontinence nappy due to failed insulation). The
compressor seems fine however, so I could perhaps try it with
that one when I finally chuck it out.
On Wed, 26 Nov 2003 17:52:25 +0000, Andrew Gabriel wrote:
I don't know how long it would last when asked to provide much more
pressure than it was wont, without any lubrication in the working fluid
which is now nirogen, and with much less flow through it to carry away
However I'm looking forward to reding about what happens.
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at www.diyfaq.org.uk
I used to mess around with compressors a lot, and they don't do
too badly as long as you keep them upright and keep the oil in.
I had one that was still pulling good vacuum after 2 years of
On 26 Nov 2003 06:52:06 -0800, firstname.lastname@example.org (N. Thornton)
Vacuum pumps, as you mentioned, excellent airbrush compressors (look
at the ones sold for GBP100 plus and see how they are made). Good
compressors where the need is pressure rather than volume - I know of
a complex watering/misting system for orchids controlled entirely by
pneumatic pressure from an old fridge compressor.
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