P Trap On Ac Drain Line

The ac equipment is set on the slab floor or curb and it is the mechanical contractor s job to install a p trap.

P trap on ac drain line.

To prevent sewer gases from coming back up the line this doesnt drain to a sewer it drains to the backyard. Air conditioning units pull a lot of water out of the air. It seems that all of the large ac companies have their installers put a p trap on every unit. If fan is located before the coil in the system the fan will push small amount of air and water down condensate drain.

Double traps are no good. If fan is located upstream of coil fan will pull water up drain line counter to water flowing down drain. 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.

It s similar to the trap under your kitchen or bathroom sink. This video is part of the heating and cooling series of training videos made to a. 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. I guess in an effort to make sure that there is one when it is actually needed.

Ok here is some detail. Anytime your drain goes up and down more than once you have a double trap unless you place an air vent between the two traps that vents above the drain inlet. That is why in the summer your car drips water. This one tells why a p trap is necessary on the air conditioner evaporator.

Also capped the p trap on the. A p trap serves a very important purpose on an a c unit. Trap failures due to freeze up drying out breakage blockage and or improper installation can compromise the seal against air ingestion through the condensate drain line. Air conditioning units are shipped from the factory to the job site without a condensate drain trap.

What is a p trap you say. The double trap causes drainage issues because air becomes trapped between the two traps and air is lighter than water. Condensate comes from evaporator coil. 08 22 2018 09 32 pm 4.