"TURTLE" wrote in message
. ..

"Greg O" wrote in message
...

"Stormin Mormon" wrote
in message ...
Window shakers come in assortment of efficiency. But,
overall, I believe
that central AC is more efficient.

Please ask your installer for:
* Rotary compressor
* TXV coil

Expect to pay a couple dollars more than a piston
compressor and orifice
coil. But, will pay for itself in efficiency.

--

Christopher A. Young


Rotary compressor in a central AC unit?? That I gotta see!

In 1960 GE made its first rotary (roller/vane type, I dont
think it was a rotary vane, but a roller thats why it is so
dependable, the vane moves in and out..thats it, it does not
scrape on on a rotating surface) compressor for split system
AC units in the under 2 ton range. Bullet proof. My RV has
one of those in its rooftop AC from the look of it.

the Daikin brand (japanese) split system heat pumps used a
roller type as well. Those went up to 5 tons ( and 4 or 5
indoor coils )

I think scroll compressors have problems in the smaller sizes
because of manufacturing tolerance issues...in larger
compressors the same tolerance limitations create less of a
loss of efficiency (pressure leaks past the scroll)... I
havent paid any attention to how small a scroll compressor is
made but it seems like 3 tons?


Phil Scott




Window shaker or a mini split perhaps, but not on a typical
central air.
Greg

This is Turtle.

hey , there was a company that started using rotory
compressors in central units back about 20+ years ago and
their name was Fedders corp.. They started putting the
rotory compressors in their central units and due to the
100% failure rate, they went belly up or bankrupt in 3 years
after starting to put them in the central units.

The problem was this as to the 100% failure rates . The Mass
of the shell of the compressors over 2 1/2 tons was too big
to let all the heat out and not heat up too much and burn
it's self up. By Now a days they must have design it right
to do it by now.

TURTLE