How To Make Condensating P Trap On Roof Top Unit

Do you know the proper way to size a p trap on an hvac unit.

How to make condensating p trap on roof top unit.

This video is to demonstrate the necessity of a trap on a rooftop furnace and air conditioner unit. Another key component of a p trap is an air vent the air vent prevents the drain that comes after the p trap from siphoning the water in the trap out. The slow dissolving enzyme gel will outperform and outlast conventional tablets and strips. Since the drain is on the return side of the ducting the bower will suck lots of air in through.

The overall height of the trap should. 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. Here is our finished product. The pull of the water to the drain has to exceed the sucking of the supply fan negative pressure rule of thumb add 2 5 to the static pressure before the fan return and internal to the unit and that s the long end.

This includes rooftop units. 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. P traps have to be installed on a suction system so a p trap was added. 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.

The important dimensions for a p trap are that the exit point of the trap is 4 to 6 inches lower than the entrance point. Been looking at some posts around here and notice a lot of mention of p traps for a c condensate lines. The condensate line comes out of the main trunk and runs to the floor just above the drain near the furnace.