Originally Posted By: tallen This post was automatically imported from our archived forum.
That’s the ticket Jerry
It is the same with evap coolers they must have an overflow drain that extends off the roof(building) or into a gutter system. So that it is keeping the dry vent dry as it was designed.
Thanks Jerry
-- I have put the past behind me,
where , however, it now sits, making rude remarks.
Originally Posted By: cbottger This post was automatically imported from our archived forum.
This unit appears to be a what is referred to as a Gas Pac do I see a gas
line traveling across the roof to this unit?? Most package combo units have the blower set up to blow across the refrigerant coil rather than drawing (sucking for lack of a better word) this would be applying a positive pressure on the condensate drain up to the P-trap and would be loosing conditioned air thru the cleanout Tee that is closet to the unit. This could be determined by simply placing your hand over the vertical open Tee and if a riser coming out of the top of the Tee was installed with a non-glued cap to prevent air loss during the cooling season does not help in the heating season when the trap goes dry even though there is a second Tee after the P-trap I would have been concerned that pressure was being discharged into the top of the plumbing vent. Perhaps bubbles in the commode. (Joke) of course. As a general rule stay away from plumbing vents with condensate drains unless the furnace is (90%) or better and produces condensate into this line in the heating season.
– Don’t argue with an idiot someone watching may not be able to tell the difference.
By the way, I don't walk roofs, yet that is an interesting angle down to the roof that I got there! LOL 
