Condensate Drain Trap Vent

The trap weir is the point at the bottom of the trap arm pipe where it connects to the trap.

Condensate drain trap vent.

This is a recent call i ran that clearly had an interesting past. Trap and vent a drain debacle. The weight of the water in the trap is enough to prevent this while still allowing condensation to flow freely. Condensate drain lines are commonly tied to vents and or drains.

This helps ensure that if a backup occurs that the water properly trips the switch instead of overflowing out of the vent. It s the height at which water will no longer flow from the trap via gravity the rim of the cup so to speak see how siphons are created below. Also known as inverted bucket steam traps these provide near continuous discharge to accommodate high condensate levels. Energy saving iron steam traps also known as thermostatic steam traps these vent cool air and condensate to increase energy efficiency in your steam lines.

The vent opening should always rise above the trip level of the condensate overflow switch when it is in the primary drain line or pan or above the secondary aux overflow port on the primary drain pan. Here is our finished product. It had a condensate pump to pump the water just a few feet up to a drain that went to a common drain. The trap arm is the portion of a fixture drain between a trap weir and its protecting vent.

Most furnaces will have at least 2 internal drains typically one for the heat exchanger and one for the vent usually at the inducer outlet or on the inducer housing. 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.