P Trap On Ac Drain Line

Condensate comes from evaporator coil.

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. This video is part of the heating and cooling series of training videos made to a. This one tells why a p trap is necessary on the air conditioner evaporator. A p trap is needed to block air and allow condensate to drain properly.

To prevent sewer gases from coming back up the line this doesnt drain to a sewer it drains to the backyard. If fan is located before the coil in the system the fan will push small amount of air and water down condensate drain. Air conditioning units are shipped from the factory to the job site without a condensate drain trap. It seems that all of the large ac companies have their installers put a p trap on every unit.

Also capped the p trap on the. If fan is located upstream of coil fan will pull water up drain line counter to water flowing down drain. 08 22 2018 09 32 pm 4. A central air system routes condensation through a u shaped trap located in the drain line just outside the air handler.

What is a p trap you say. 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. It s similar to the trap under your kitchen or bathroom sink. There is a major difference between using p traps on sanitary applications and condensate removal from an ac unit and that is.

All air conditioners have a special drain for. Ok here is some detail. Air conditioning units pull a lot of water out of the air. Double traps are no good.

A p trap serves a very important purpose on an a c unit. 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. I guess in an effort to make sure that there is one when it is actually needed. See when moist air hits something cold the water condenses out of the air and collects on the cold surface.