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johnL
how long till water drips?

We bought this house about 8 months ago and I turned on the central air today for the first time. It cooled okay but I'm curious about the fact that there was no condensation dripping. I let it run about 15-30 minutes and when there was no dripping I got concerned and turned it off.
It's a 2.5 ton Goodman air conditioner, not a heat pump. The house is about 2000 sq ft. I'm in western North Carolina, the outside temp was about 80, and the humidity in the house was 50-55%. I have access to both the main drain and the overflow right where they come out of the inside unit, and there was no water in either one.
Does it take longer than that for condensation to come out of the drains? I thought it would be pretty quick.
Thanks a lot.

Sten
Re: how long till water drips?

It shouldn't take that long as the refrigerant is starts to flow as soon as it's turned on and in turn cools the evap. coil, the return air which is warmer goes through the evap which causes the condensation. If there is no condensation then maybe it's low on refrigerant and the coil isn't cooling as it should. Check your supply temp., it should be 58-64 degrees, I keep mine at about 60. Be sure it doesn't get to far below the 58 or your coil will freeze up. Good Luck :)

johnL
Re: how long till water drips?

I'll check the supply temp but I don't think it's that cold.
Thanks for the help.

johnL
Re: how long till water drips?

Well, turns out it is cold enough; I put two thermometers on a supply vent and they both say the temp's about 60. It didn't seem that cold, maybe because there isn't a lot of air movement. It definitely isn't moving as much air as I'm used to with an air conditioner. At any rate, it ran for about an hour and still no dripping!

Sten
Re: how long till water drips?

Is your filter clean, is your return on the floor and blocked? Either one of these can cause your evap coil to freeze because of lack of air movement across the coil and if it freezes you won't get condensation, it will also cause a lack of supply air.

johnL
Re: how long till water drips?

Filter's good, we have lots of returns, including one right on the return plenum. We actually do have movement, it just feels more like it's appropriate for a furnace rather than an air conditioner. In other words, it's not blowing as fast as I'm used to.

I think I'm going to remove the drain pipes from the coil and see if I see moisture in there.

Thanks.

Sten
Re: how long till water drips?

Make sure those drain pipes are pitch correctly and check to see if the drain hole in your drain pan is plugged up, sometimes after a while if it hasn't had a PM done on it you'll get what I call scode build up in the pan, it will block the drain hole.

johnL
Re: how long till water drips?

Well I just found out that there's air coming out of both drain pipes when the fan is on, so they're not clogged.
What now?
I've turned the ac on again; think I'll let it run until something happens.

johnL
Re: how long till water drips?

We have plenty of water dripping now. I guess the drip pan was just completely dry and it needed time to fill to the level of the drain.

I have a question about the drains, though: They're PVC, and they were obviously glued together AFTER the first fitting was screwed into the drain pan. So now they can't be unscrewed from the pan for cleaning. I've read that you're supposed to clean them, so how are they supposed to be put together? If you don't glue the PVC, seems like vibrations would shake them apart.

Thanks again for your help.

Edit: I see that water's coming out of the overflow drain. I put something into the main drain (through the little T vent) and it came out damp, which it was not doing yesterday, so the water's running through it, but apparently not enough since the overflow is wet also. So I guess I need to clean the main drain where it comes from the pan, so back to my question about how the drain is supposed to be built and attached.

Sten
Re: how long till water drips?

A 3/4" male adapter should screw into the drain pan, then a short piece of 3/4 pvc then a 90. How it gets put together after that depends on your access panel, be sure not to block it or you won't be able to get inside unless you cut it. If you have no other choice than to block it use 3/4 pvc unions so you can access the coil and pan. Also you should have a p-trap depending on the location of the blower motor, if the blower is on the return side blowing into the coil you don't need a p-trap. If it's on the supply side pulling the air through the coil you do need a p-trap, always make sure you p-trap is full, the beginning of the cooling season especially as it will have dried out over the winter. If it's not full it won't drain. Good Luck :)

johnL
Re: how long till water drips?

Just thought I'd let you know it's fixed.:)
The drain was okay where it came out of the pan (I found that out when I started sawing the pipe off the fitting and the water started flowing out!!!) but the line was clogged up with some kind of gunk at the first 90 degree fitting. The shop vac took care of that and we now have water flowing all the way through.
Thanks again.

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