Does This Sound Like A Broken/hurting Hvac Unit? - HVAC - DIY Chatroom Home Improvement Forum

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Old 06-25-2008, 02:28 PM   #1
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does this sound like a broken/hurting hvac unit?

The other day I was surprised to see how weak my (maybe 5?) year old hvac was.

From about 5:30-7:30p, the ambient outside temp went from about 90 down to 86, but the hvac, running full blast (set waaaay low, like 60's), could not break 75 degrees all afternoon.

The fan/blower was in the 'always on' position, the thing was blowing cold air, it just couldn't beat 75 degrees!! That just didn't seem right to me, I figured it should be able to break below 70 with that many hours.

Sound broken or normal? If the former, any recommended steps?


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Old 06-25-2008, 05:26 PM   #2
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take a normal analog thermometer and mesure the air going into the ruturn, then mesure the air coming out the supply . It should be about 20 degrees colder if not check your filter indoor and outdoor coils make sure they are clean if they are call a pro it could be low on refrigerent (do a leak test ) or the compressor might be over heating and cycling on and off in that case its time to upgrade to a nice geothermal unit


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Old 06-25-2008, 08:17 PM   #3
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shut your condenser power on the outside disconnect...unscrew the condender top a put the fan and top section off to he side or just off the edge support it with a garbage can.get some Fantastic cleaner and pour it all around the top exposed coils and let it work its way downlet it set for 20-30 minutes.then with a nozzeled hose wash it from inside out all the way around top to bottom(wrap the compressor with a plastic bag if your concerned of it getting wet).your local Graingers has coil cleaner a little more harsher it will foam when oured on directly and work into the coil and fins.that right there get beat up by the HEAT of the day...with the sun hitting it.put it all back together put the power back up and peg the stat down to 50F.AT THE CONDENSER....the air into the condenser coils should rise 10F blowing in your face..the liquid line should be warm but never so hot so you can't grab it.your suction( insulated line) should be cold to ice cold after a 30 minute run?like said 20F on the air handler is typical with 10F rise on the condenser air in and out.actaul guages and an amprobe will give us more info to feed on your could be as simple as that condensing cleaning...check the liquid line(smaller copper line out of the condenser) running before the cleaning then after it to see a result
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Old 06-28-2008, 10:44 AM   #4
oops, did I do that!
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Check your filters and clean the condensor. If you see any icing on the tubing after you have completed both, the unit may be undercharged or the evaporator may be restricted and need to be cleaned.
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