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Old 04-01-2011, 07:19 AM   #31
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Condensate only drains when blower stops


I'm still having the problem, am still living with it, and would still love to find a solution.

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Old 04-01-2011, 02:42 PM   #32
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Condensate only drains when blower stops


I've seen when the trap is the wrong size or it's not primed air will suck in not allowing for it to drain out until the fan shuts off.
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Old 04-01-2011, 02:50 PM   #33
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Condensate only drains when blower stops


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Originally Posted by Hubcap626 View Post
I've seen when the trap is the wrong size or it's not primed air will suck in not allowing for it to drain out until the fan shuts off.
Does lack of prime also apply to a positive air pressure situation? Air blows out of the trap on my system.
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Old 04-01-2011, 03:53 PM   #34
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Condensate only drains when blower stops


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Originally Posted by sethmorgan

Does lack of prime also apply to a positive air pressure situation? Air blows out of the trap on my system.
Yea it could just dump some water down that cleanout and make sure the trap is filled with water. If that doesn't do it I would be willing to bet that trap is not the right size.
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Old 04-01-2011, 04:12 PM   #35
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Condensate only drains when blower stops


No, positive pressure drains shouldn't have traps. Doesn't matter if the trap is filled or not on positive pressure drains.
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Old 04-02-2011, 09:37 PM   #36
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Condensate only drains when blower stops


Interesting. So it's normal to have cold air blowing to the outside? Not trying to contradict the professionals, I'm actually wondering this. Seems to go against all the preaching about sealing air leaks in the home. I thought another reason to have a P-trap with a water barrier was to keep critters from getting inside. I shudder at the thought of a palmetto bug (roach) getting into my HVAC system and dropping out of one of my vent registers.
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Old 04-03-2011, 06:12 AM   #37
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Condensate only drains when blower stops


Many techs don't trap positive pressure drains. Myself, I do.
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Old 04-03-2011, 09:05 PM   #38
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Condensate only drains when blower stops


Why don't you get the installation instructions of the coil for a horizontal installation. It looks like the drains should be on the opposite side of the coil and usually on a blow through coil you don't need a p trap. Some horizontal installs require you to relocate the pan.
How is the coil install? verticle or pitched towards the air handler or away from the air handler? Is it a flat coil or "A" type coil?
Did this system operate OK in the past? Maybe the three filters are causing too much air restriction and causing the coil to ice up.
Are all the supply registers open?
Is the return grille blocked?
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Old 04-04-2011, 07:35 AM   #39
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Condensate only drains when blower stops


That makes sense that the drain should be on the opposite side. So I guess it was installed wrong. The previous three HVAC techs that have come out to do bi-yearly maintenance all confirmed that everything looked ok so go figure.

The coil is an "A" type, with the base of the A facing the blower and the tip facing downstream towards the direction of airflow.
The cleanout tube was discovered removed when I bought the house. When I replaced it this issue was discovered.
All the supply registers are open and none of the returns are blocked.

Thanks for the input.
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Old 04-04-2011, 08:10 AM   #40
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Condensate only drains when blower stops


Are both the inside and outside of the coil clean?
Are you getting good airflow through the supply registers?
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Old 04-04-2011, 08:25 AM   #41
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Condensate only drains when blower stops


The outside of the coil is clean, but I can't see the inside to tell. Is it possible to view the inside from the blower area? I flushed the coil with low pressure water from the top last year when I was initially troubleshooting this so hopefully it's clean on the inside too. The air flow from the registers seems sufficient; it's not blowing my hair if I stand under one or anything, but the unit is able to maintain the thermostat set point without being on an inordinate amount of time.
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Old 04-04-2011, 08:30 AM   #42
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Condensate only drains when blower stops


Maybe with a mirror & light thru the blower compartment.
There may be a dust build up.
Is air bypassing around the outside of the coil?
Has the system ever drained right?
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Old 04-04-2011, 08:36 AM   #43
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Condensate only drains when blower stops


I'll check this tonight.

The system hasn't drained right since I discovered the cleanout tube wasn't installed and reinstalled it.
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Old 04-04-2011, 08:01 PM   #44
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Condensate only drains when blower stops


CHECK OUT THIS SITE. IT MAY BE HELPFUL TO YOU.
http://www.ashireporter.org/articles...s.aspx?id=1648
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Old 04-05-2011, 08:36 AM   #45
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Condensate only drains when blower stops


I haven't had a chance yet to check the coil for blockage. However, with the system running, air flow from a register near the main duct seemed weak.

Thanks for the article; it was very informative and it appears my trap is designed properly. The only thing that may be deficient is the depth of the trap, but there is always water in it when the unit is operation (not too shallow to get blown out, which is moot since it only has the possibility of blowing out with the cleanout removed).



This is really puzzling. Without the cleanout installed, I'm having symptoms of a draw-through system that is missing the cleanout.

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