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Quick Check on HVAC Units

Posted by Mike Giglio on July 23rd, 1998 12:34 AM
In reply to A/C low on charge? by HVACMAN on June 21st, 1998 09:55 PM [Go to top of thread]

2 of 3 people found this post helpful

Rory, There are several things to check when trying
to determine if the unit is performing to specifications.
As the previous follows ups indicated make sure the
air return filter is clean. With the filter removed use
a flashlite and visually check the evaporator coils which
more than likely are copper tubes with alumium fins.
Some return air filter intake housing aren't air tight
allowing some lint to bypass the filter media and eventually
building a dirt film on the fins. When checking the condensor
(outdoor component) make sure it has ample air flow.
Units tend to attract leaves and lawn clipping which will
restrict proper air flow accross the unit. Last, visually
inspect the 2 copper tubing lines which leave the unit. The
smaller line is the liquid r-22 refrigerant which
has been superheated by the compressor. If the unit is
low on freon you can feel air bubbles pulsating in the line.
You need to also inspect the larger line which carries the
heat gather from indoors. This line should be sweeting after
approx. 5 to 10 mins of run time. If this line isn't dripping
and feels to be approx. 65 to 75 deg F unit needs additional
freon. There are additional methods which ref. mechanics use
which includes checking both suction & discharge pressures
along with the running load amperage of the compressor unit.
These require tools which are rather costly to own. Good Luck

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