The absence of a properly working p trap could push unfiltered air into your home and cause an overflow of the condensate drain.
Ac condensate line p trap.
The condensate p trap is white and is constructed of schedule 40 dwv plastic.
That is why in the summer your car drips water.
See when moist air hits something cold the water condenses out of the air and collects on the cold surface.
There is a major difference between using p traps on sanitary applications and condensate removal from an ac unit and that is the latter has a pressure within the drain pain.
Air conditioning units pull a lot of water out of the air.
Traps with insufficient height between the inlet and outlet design deficiency on draw through systems can cause the drain to back up when the fan is on possibly causing drain pan overflow or water droplet carryover into the duct system.
Presently most plumbing codes call for the use of a p trap on all appliances that are connected to a sanitary sewer.
Air was coming in from the outside and creating a dam which was preventing the condensation from going out of the a c and.
A p trap serves a very important purpose on an a c unit.
P traps have to be installed on a suction system so a p trap was added.