P Trap Hvac Condensate Drain Line Design

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P trap hvac condensate drain line design.

Air conditioning units pull a lot of water out of the air. Since p traps seal against air leakage they were the natural solution to prevent air leaking in the condensate drains of early 1900s air conditioning units. See when moist air hits something cold the water condenses out of the air and collects on the cold surface. Trap for draw thru unit condensate beginning to drain away.

What is a p trap you say. All air conditioners have a special drain for. It s similar to the trap under your kitchen or bathroom sink. Fan inlet pressure negative h figure 3.

A central air system routes condensation through a u shaped trap located in the drain line just outside the air handler. 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. Minimum maximum sea level. W c 1 2 in.

Three quarters of an inch is sufficient for up to 20 tons according to the imc unless the drain outlet size is larger than in ch use t able 307 2 2 for condensate pipe sizing. 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. Minimum h fan outlet pressure in. W c 1 in.

A p trap serves a very important purpose on an a c unit. Do you know the proper way to size a p trap on an hvac unit. That is why in the summer your car drips water. 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.

Condensate switches imc 307 2 3 states that all hvac equipment that produces condensate must have either a secondary drain line or a condensate overflow switch a secondary drain pan with a secondary drain line or condensate switch or some combination of these installations should be used to prevent overflow if the primary drain line blocks.