In article ,
says...
A friend is looking into putting in a mini-split air conditioner. The room
does not have an outside wall. She has calculated that she needs 6000 to
7000 BTU--max. But all single zone units I find are about 9000 BTU. She
very much does not want an oversized unit that leaves the room cold and
clammy.

Some units I find have a dehumidifying mode. Does this mean that when it
reaches the set point temperature it continues to run to remove the
humidity?


It does *not* mean that. Unfortunately, the mini splits do not have a very
sophisticated control scheme. All the dehumidify mode means is that the unit
cycles on and off on a fixed timer. It does not control temperature at all in
this mode. Mine runs for something like 7 minutes on, then 3 minutes off.

We tend to have many days with high humidity but not real high outside
temperatures, and the dehumidify mode works fairly well. But if it cools off
in the evening, it can make the room quite cold.

--
DT

snipped
It does *not* mean that. Unfortunately, the mini splits do not have a very
sophisticated control scheme. All the dehumidify mode means is that the
unit
cycles on and off on a fixed timer. It does not control temperature at all
in
this mode. Mine runs for something like 7 minutes on, then 3 minutes off.


thats not correct a correct statement, with the new Fujitsu mini-split heat
pumps.... they use Variable frequency inverter drives and literally vary
their motor and compressor speeds for demand dehumidification without
turning the place into a walk in freeze box. The RLQ and RLS series
literally vary their output from 40% to 115% of their rated capacity
depending on demand.

In article ,
says...
snipped
It does *not* mean that. Unfortunately, the mini splits do not have a very
sophisticated control scheme. All the dehumidify mode means is that the
unit
cycles on and off on a fixed timer. It does not control temperature at all
in
this mode. Mine runs for something like 7 minutes on, then 3 minutes off.


thats not correct a correct statement, with the new Fujitsu mini-split heat
pumps.... they use Variable frequency inverter drives and literally vary
their motor and compressor speeds for demand dehumidification without
turning the place into a walk in freeze box. The RLQ and RLS series
literally vary their output from 40% to 115% of their rated capacity
depending on demand.


Nice. Sounds expensive, but nice! I have had my mini split for 4 years and
when I researched them back then I was dismayed at how unsophisticated they
were. One thing that might improve them is a true remote temperature sensor
(not just a remote control). I added a remote sensor and controller with
adjustable span to a window unit and it transformed the way it controlled the
room temperature and lowered the humidity.

--
DT

"DT" wrote in message
...
In article ,
says...
snipped
It does *not* mean that. Unfortunately, the mini splits do not have a
very
sophisticated control scheme. All the dehumidify mode means is that the
unit
cycles on and off on a fixed timer. It does not control temperature at
all
in
this mode. Mine runs for something like 7 minutes on, then 3 minutes
off.


thats not correct a correct statement, with the new Fujitsu mini-split
heat
pumps.... they use Variable frequency inverter drives and literally vary
their motor and compressor speeds for demand dehumidification without
turning the place into a walk in freeze box. The RLQ and RLS series
literally vary their output from 40% to 115% of their rated capacity
depending on demand.


Nice. Sounds expensive, but nice! I have had my mini split for 4 years and
when I researched them back then I was dismayed at how unsophisticated
they
were. One thing that might improve them is a true remote temperature
sensor
(not just a remote control). I added a remote sensor and controller with
adjustable span to a window unit and it transformed the way it controlled
the
room temperature and lowered the humidity.

--
DT

Expensive is relative..... According to ARI, $235/year to heat and cool for
the 15RLQ is cheap to operate by any standard.... the ones I have put in
were $2,700 plus tax installed.
http://www.fujitsugeneral.com/wallmo...pecs.htm#specs

On Sat, 19 Jun 2010 11:55:37 -0500, Steve wrote:

thats not correct a correct statement, with the new Fujitsu mini-split heat
pumps.... they use Variable frequency inverter drives and literally vary
their motor and compressor speeds for demand dehumidification without
turning the place into a walk in freeze box. The RLQ and RLS series
literally vary their output from 40% to 115% of their rated capacity
depending on demand.

Hi Steve,

You've sold me. I have wanted a variable speed a/c for more than 20 years.
When I put the Carrier packaged unit on the roof six years ago I wanted it.
But it wasn't an option, so I settled for undersizing it a little. Then
when I replaced my downstairs regular split unit two years ago it was
available! This being the Carrier Infinity. It is nice to find out that
this feature is finally making it to the mini-splits.

My friend (we're in Brooklyn) just now has to get a couple proposals and
get the coop to approve the hole through the outside wall. There is already
electricity outside on the balcony. I would think a 3/4"-1" hole would do.

Thanks, Don www.donwiss.com (e-mail link at home page bottom).