Up hill????

The reason for the "higher" air speed is that cool air is dense [heaver]
than heated air. Take a look at a pscyometric chart and plot... you'll see
the cooled air carries more weight per foot than heated air, thus needs more
torque.

Actually, you can run air conditioning down to 200 cfm per ton Stormy, but
the results are dismal. You will remove a considerable amount of moisture
from the air but will pay for it in performance. 25 years ago, 325 cfm per
ton was the norm and 400 cfm per ton on heat pumps. Now the norm is 400 cfm
per ton on air conditioning and 450 cfm per ton on heat pumps. Why the
difference? Performance.

Zyp

"Stormin Mormon" wrote in message
...
Other than the Y signal to the furnace, the rest of it looked OK.
The lower fan speed won't do as good a job of pushing cold air up
hill. Would work fine if the air handler was in the attic. Where
I am, furnaces are typically in cellars.

--

Christopher A. Young
You can't shout down a troll.
You have to starve them.
.

"Zephyr" wrote in message
news : Ok Stormy;
:
: His diagram actually is sound. The only problem I see is that
with the
: [newer] computer boards on some furnaces require that the "Y"
terminal be
: connected to the furance computer board as well. Some newer
furnace boards
: run the "continuously fan" at a slower speed than with the air
conditioning
: ["G" terminal]. The computer recgonizes the demand for air
conditioning
: ["Y" terminal] and runs the blower at highest speed.
:
: Stormy, go back and check the wiring again. You will see it is
correct.
: 2-wire condenser - 4 wire thermostat.
:
: Zyp
:
: :
: : http://home.att.net/~galt_57/thermostat.bmp
: :
:
:
:
: