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Old 07-21-2008, 09:53 AM   #1
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Condensate and Humidity


Goodman 3 ton package heat pump. When indoor fan starts, any water in the condensate tray is sucked back into the unit. I have opened the side panel and observed (and heard the sucking sound) as the water is sucked-up. No condensate leaves the unit while the indoor fan is running. Soon after the indoor fan stops, water gushes out of the condensate drain tube. The manufactuer's recommended drain tubing/trap is installed.
Temperature/RH at one of the floor registers is 56F/85% during cooling. The space RH measured at several locations is 54%. Temperature control is good.
QUESTION: Is something wrong here? Is it normal for the water to be held (apparently on the evaporator) while cooling?

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Old 07-21-2008, 10:15 AM   #2
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Condensate and Humidity


The manufactuer's recommended drain tubing/trap is installed. Is it?

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Old 07-21-2008, 08:42 PM   #3
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Condensate and Humidity


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Originally Posted by 1610 CUB View Post
The manufactuer's recommended drain tubing/trap is installed. Is it?
like 1610 pointed out make sure trap is installed properly, make sure no drains are plugged, sounds like a negative pressure instaed of positiive pressue going on, good luck,Victor
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Old 07-21-2008, 11:00 PM   #4
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Condensate and Humidity


How deep is the trap at the evaporator? From the top of the first 90, to the bottom of the trap, then from the bottom to the trap to the top of the outlet.

No, its not normal to hold that much water in the pan. Is there water on the floor, or inside the furnace/air handler?

Last edited by 8 Ball; 07-21-2008 at 11:04 PM.
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Old 07-22-2008, 03:21 PM   #5
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Condensate and Humidity


Goodman 3 ton package heat pump. When indoor fan starts, any water in the condensate tray is sucked back into the unit. I have opened the side panel and observed (and heard the sucking sound) as the water is sucked-up. No condensate leaves the unit while the indoor fan is running. Soon after the indoor fan stops, water gushes out of the condensate drain tube. The manufactuer's recommended drain tubing/trap is installed.
Temperature/RH at one of the floor registers is 56F/85% during cooling. The space RH measured at several locations is 54%. Temperature control is good.
QUESTION: Is something wrong here? Is it normal for the water to be held (apparently on the evaporator) while cooling?

Added info: Goodman 3 ton package heat pump - there is no floor to be concerned with, there is no furnace/air handler. The manufactuer's recommended drain tubing/trap is installed.

Added info. 2: Temperature/RH at one of the floor registers is 56F/85% during cooling. The space RH measured at several locations is 54%. Temperature control is good.
Some water is always in the tray because the drain pipe enters the side of the tray; therefore, there is always about 1/4 inch water below the pipe entry.
ESP is 0.4 in.WC (0,1 supply/0.3 return) = 1200 cfm

Last edited by rosehillraymond; 07-23-2008 at 11:54 AM.
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Old 07-22-2008, 08:21 PM   #6
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Condensate and Humidity


Why is there water in the external condensate pan during the off cycle? If the RH is 85% at the supply registers, it is not dehumidifying. If you can take the side panel off the unit, and it still sucks the water back....thats some heavy duty negative pressure, and I cannot believe the moisture on the coil isnt being thrown down the supply duct.

Could be your moving way too much air.

Is the unit equiped with an economizer? Space at 54%, supply register 85%?


Last edited by 8 Ball; 07-22-2008 at 08:30 PM.
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