Ac Drain Line Trap

I have a forced air furnace air handler in my basement with a standard a c unit condenser out side a c coil in the main supply truck about a couple inches over the furnace air handler.

Ac drain line trap.

If fan is located upstream of coil fan will pull water up drain line counter to water flowing down drain. Do i need an airgap or will the. Or lack of a p trap and air vent in the drain line which prevent water backup. A central air system routes condensation through a u shaped trap located in the drain line just outside the air handler.

The secondary drain line needs to be pointing downward toward the drain pan but other than that it is properly installed. As you can see on the main drain line there is a p trap and the vent pipe is after the p trap allowing for proper air and water flow. 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. Double traps are no good.

Condensate comes from evaporator coil. If fan is located before the coil in the system the fan will push small amount of air and water down condensate drain. The double trap causes drainage issues because air becomes trapped between the two traps and air is lighter than water. 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. A p trap is a pipe that is shaped to allow condensed water to properly drain off the hvac nancho. It sounds like this should be run before the p trap in the bathroom drain correct. This video i explain why ac systems need drain traps when evap coil is on the negative side of system meaning before blower motor.

The condensate line comes out of the main trunk and runs to the floor just above the drain near the furnace. Stuff ing from our ac drain pipe air conditioner s condensate line ac safe air conditioner pan tablets 6 pink slime in my bathroom time for a algae guard hvac condensate drain pan white slime is no match for an educated hvac technician 2019 07ac drain maintenance how to clear a clogged linewhat is this read more. This presents a problem for the condensation drain since the air conditioner is at a negative pressure relative to the outside air. A p trap is needed to block air and allow condensate to drain properly.

I will also run a p trap in the condensate line before it gets to the drain. Been looking at some posts around here and notice a lot of mention of p traps for a c condensate lines. View may 26 2016. Ok here is some detail.