Water from Carrier gas furnace-A/C in Attic

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Old 06-30-20, 12:38 PM
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Water from Carrier gas furnace-A/C in Attic

I have a Carrier 92% efficiency furnace in attic for second floor.
Several days ago, no rain or storm, but water is droppiong from ceiling light fixture cover.
Went up into attic. Found dropping water around drain pipe when AC is ON.
Draining pipe is sweating especially around P trap and the pipe connects to it.
Filled two bottles of water from the cap on top of P trap. Seem no blockage. So looks water is from condensation.
Estimated about a cup of dropping water every three days. And the drain pan is not sealed.

Question: Can I insulate the draining pipe? If so, can I use rubber tape for P trap and foam for straight pipe?


 
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Old 06-30-20, 03:27 PM
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Welcome to the forums.

The drain pan below the unit is supposed to catch all that extra condensation. The drain below does not get covered. It looks like there is quite a bit of water in it. Is there a separate drain for it ?

It doesn't look like the air handler is insulated very well.
The reason for the traps is to slow/stop the amount of cold air escaping the unit. The drain fittings shouldn't be getting that cold.
 
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Old 06-30-20, 07:30 PM
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Thanks Pete. Yes. There are lots of water in the pan. I doesn't have much knowledge about HVAC and plumbing. I guess the front pipe is draining pipe. The pipe behind is backup pipe(I read from somewhere).

The top door is not aligned well. The draining pipe goes down after P trap and turns left behind red wire. The pipe behind red wire to the left is insulated. Most dropping water is at bottom of P trap and a little bit from the horizontal pipe above the top door.

I brought some Frost King rubber insulation tape. Based on description it has glue on one side. Is it a good idea to wrap that tape around P trap? Will glue mess up PVC pipe?

I can opened top door. But bottom door is hard to open. I cannot find any filter around the unit. Was wondering if filter is inside the bottom door.



 
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Old 06-30-20, 09:33 PM
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The lower fitting is always the primary drain and the upper one is the overflow.
Most air handlers don't have filters in them. I don't see it next to the unit so my guess is will be behind the return grill which is probably in your hall some where.
 
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Old 07-01-20, 05:29 AM
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Hi, so it looks like the water is dripping off of the drain lines and into that pan on the floor, are those pipe open and drain into that pan or do they go directly outside ? that pan should have a drain pipe leading outside.
Also that top cover on the unit does not look like itís straight
Geo
 
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Old 07-04-20, 06:45 PM
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The draining pipe doesn't drain into that pan. It is just condensation that dropped into the pan. The draining pipe goes down after P trap, turns left behind red wire, then make several turns and finally goes outside.

One interesting thing is condensation is much less after I turned temperature one degree higher.
 
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