I have a Heil 5000 hvac system. Live in the south where it's hot &
humid. Occasionally when the inside unit cycles off I hear the
condenser unit continue running for 30-45 seconds before it shuts
down. Seems to happen mostly when the outside temp is mid 90's or
hotter. Is this normal? I'm thinking possibly a cooldown for a hot
compressor? Or would it be a sticking contactor? It doesn't do it
all the time, or long enough to troubleshoot, so I'm left guessing.
Any constructive comments are appreciated.
It's actually running. I can look out the window and see the fan
blades turning. Funny thing though is the relative consistancy of the
run-on time when it does it. I would think a sticking contactor would
be more variable in time. However I gave the contactor a good spraying
with contact cleaner & will see if there is any difference. If none,
I'll replace the contactor.
Because as I said in the original post, it's an "occasional"
occurance, as in "once or twice a week and not often enough to
troubleshoot". Why pay for a callout when chances are the problem
will not occur while the tech is there? My intent for the original
post was to ask if a rundown was normal for a hotter than normal
compressor and I got the answer of "no".
BTW, I have 50 years experience in instrumentation & control circuitry
and know well that when an intermittent problem occurs the best you
can do is make logical guesses. So I'm guessing a weak return spring
in the contactor or the thermostat. You may have other guesses, but
at this point I'm going to try mine first.
First, I don't guess, I troubleshoot and diagnose problems.
Second, a competent tech KNOWS what to look for. Unlike yourself, he
WOULDN'T have sprayed contact cleaner on the contactor hoping to resolve
this issue! And for you having 50 years experience... only shows your lack
of training in your own field!
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