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Posted by Perry on January 17, 2009, 9:45 pm
Perry had written this in response to
http://www.thestuccocompany.com/hvac/How-is-this-thing-SUPPOSED-to-work-36445-.htm
:
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DrYattz wrote:
> I have a 7 year old Goodman 3 1/2 ton "split system" heat
> pump; the
> compressor is about 40 feet from the air handler. The heat
> occasionally blows hot (120 degree) air for a few minutes, but then
> blows lukewarm (78 degree) air for hours, occasionally switching off
> for about 5 minutes.
> Last February I had a similar problem, and sought help here. Then,
> the room temperature seldom reached the thermostat setting. A few
> brilliant people made extraordinarily insightful criticisms of
> Goodman, from which I could not afford to benefit by replacing the
> unit. Finally, last February, I called a factory-certified HVAC
> repair company which replaced the heating elements with higher wattage
> ones, and things improved. The serviceman returned last week, checked
> it out, and pronounced it "functioning properly."
> But I still don't get it: why does the damned thing run all day long,
> even after it reaches the set temperature on the thermostat? Why
> doesn't it come on, blow hot air until it reaches the thermostat
> setting, then turn off until the temperature drops below the setting
> again?
> I've got a graph that shows the pattern over an hour and a half:
> http://img148.imageshack.us/my.php?image=hvac11009jm3.jpg
> You can see that it only blows "hot" air for a couple of
> minutes - in
> this sample from this morning, it never made it over 100 degrees,
> although from time to time I find 125 degree air coming out.
> I'm longing for the days of the old radiator systems. . .
When the Temp. brops below 35 set the Thermostat on Emergency Heat till it
warms up outside to above 35.
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> pump; the
> compressor is about 40 feet from the air handler. The heat
> occasionally blows hot (120 degree) air for a few minutes, but then
> blows lukewarm (78 degree) air for hours, occasionally switching off
> for about 5 minutes.