I have a Carrier high efficiency furnace which uses 2-inch PVC pipes to pull in combustion air from outside and exhaust the combustion gasses back outside (through a concentric vent, but that's not really important.)
It seems that the installer drilled a 0.5" hole in the exhaust pipe about 2 feet up from the heater.
When the heater is running, you can feel air coming out of this hole, it is warm and moist, and it smells like you would expect natural gas exhaust to smell. (Before you ask, yes, there IS a carbon monoxide detector right outside the door of the room, and no, it does not detect anything.)
The issue I have is that there is a lot of water vapor present in the exhaust, which condenses on the inside of the pipe and then drips out through the hole, collecting in a large puddle on the floor. (If you look closely at the picture, you can see the trail of water below the hole.)
(I notice that my neighbors always have clouds of water vapor coming out of their exhaust on cold days, but I never do. As far as I can tell, the reason for this is that their exhaust pipe is only a few feet long since their unit is right next to an exterior wall, while my pipe is 30 feet long so the water has space/time to condense.)
In any case, the puddle is annoying and messy, and the room is too narrow to just put a bucket there -- it would obstruct the walkway to the washer/dryer.
Right below the exhaust pipe (not shown in the picture) is the condensate pump for the heater drain and humidifier drain. (For some reason, they piped the AC drain directly to outside but the other two drains to a pump which goes to the sink.)
- Am I correct that condensation in such a long pipe is normal?
- If not, what is wrong with my furnace?
- If I seal up the hole so the condensation has to drain back through the unit and out the actual furnace drain, will that cause any damage?
- If I can't seal the hole, is there a simple way to catch the moisture at the hole and direct it into the condensate pump instead of onto the floor?