For an AC, the normal case is another drain leading outside. If you see it
dripping when you mow the law, raise the alarm.
I recently added a pipe with a cap on it to the evaporator unit. My plan is
to dump a cup or so of bleach in there once a year to bother the algae and
moss and fungus and whatever else grows there that stops up the drain.
There is an overflow PVC pipe but the tray has to fill up with several
gallons of water before it starts to drip on the deck. The main A/C
drain gets clogged up and I flush out the debris with a garden hose
twice a year. I found that bleach may help, but it still requires
flushing. I want to avoid water damage.
I bought some of those cheap jobs at Harbor Freight. They have a probe that
goes where you would like unwanted water to be detected. A four foot line
leads to the sending unit which contains the 4, AAA batteries and the
irritating, intermittent and fast beeper. Sold me on it the first time I
heard it go off.
I have one of the $10 ones from HD. It's a battery powered plastic
box with alarm and contacts on the bottom. I have it placed near my
water heater. For that application, I think it's fine, because it's
likely someone will hear it in time to avoid serious damage.
But I'm sure you can do better and depending on the application, it
could be well worth it. For the attic AC, I think I've seen systems
where there was an auto shut-off of the AC. In fact, you would think
this would be standard reqt now. That, along with 2 drain lines
would be my preferred solution, as it doesn't rely on anyone being
around to take action.
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