P Trap Condensate Drain

What is a p trap.

P trap condensate drain.

Condensate comes from evaporator coil. A p trap is needed to block air and allow condensate to drain properly. The ac equipment is set on the slab floor or curb and it is the mechanical contractor s job to install a p trap. If fan is located before the coil in the system the fan will push small amount of air and water down condensate drain.

If fan is located upstream of coil fan will pull water up drain line counter to water flowing down drain. P traps have to be installed on a suction system so a p trap was added. A central air system routes condensation through a u shaped trap located in the drain line just outside the air handler. A p trap is nothing more than a properly shaped piece of pipe no moving parts just the proper shape so gravity does the work for us.

Air was coming in from the outside and creating a dam which was preventing the con. Air conditioning units are shipped from the factory to the job site without a condensate drain trap. 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. See water won t flow up hill so the 180 degree turn in the drain causes water to get trapped in the bottom of.

There is a major difference between using p traps on sanitary applications and condensate removal from an ac unit and that is.