Removing humidity takes a LOT of power, so the 12 degree
drop may be OK. Not sure from here, why the fan turns off.

--
Christopher A. Young
Learn more about Jesus
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..


"DerbyDad03" wrote in message
...
On Jun 1, 12:20 am, DerbyDad03 wrote:
It's 80 degrees in my house with 58% humidity. Time for
some AC.

Comfort 90 Max (Rheem) with Central Air

2 questions:

1 - With the fan set to "On" and the temp set to 70, I
turned on the
AC. Here's what it does:

The blower will run for about 20 minutes (I didn't time
it) and then
shut off for about 30 seconds. It does this continually
and it's been
doing it for at least a couple of years. I first noticed
it last
summer but I can't honestly say whether or not it's been
doing it
since the unit was installed 5 years ago.

It only does this when the AC is on, not when the heat is
on or when
the blower is set to On just to circulate the air. It's
only when I'm
using the AC does the blower take a break.

Is this normal?

2 - I checked the temperature differential between the
return trunk
and the plenum just above the AC coils.

77 in the return trunk, 64 in the plenum, except when the
blower turns
off (see above). When the blower turns off, the plenum
temperature
drops to 59. After the blower come back on (~30 seconds
later) the
plenum temperature goes back up to 64.

What do think about that differential?

An update:

Now that the house is at 71 degrees, it doesn't seem to be
cycling the
blower. I just monitored it for 40 minutes and it hasn't
turned off.
That's longer than when the house was at 80.

The temp differential is 69 - 57.

Shouldn't it be higher, like around 15+ degrees?