P Trap Hvac Condensate Drain Line Design

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.

P trap hvac condensate drain line design.

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. It s similar to the trap under your kitchen or bathroom sink. Minimum maximum sea level. Condensate drain pan h 2 minimum sea level when condensate begins to drain off h fan inlet pressure in.

See when moist air hits something cold the water condenses out of the air and collects on the cold surface. That is why in the summer your car drips water. As air conditioning caught on in the 50s p traps were the standard that every contractor field designed and installed even if it was unknown to them whether the drain pan was at. All air conditioners have a special drain for.

Trap for draw thru unit condensate beginning to drain away. Co ndes at r i p r ec om ndati. Do you know the proper way to size a p trap on an hvac unit. Fan inlet pressure negative h figure 3.

Air conditioning units pull a lot of water out of the air. W c 1 in. A p trap serves a very important purpose on an a c unit. 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.

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. A central air system routes condensation through a u shaped trap located in the drain line just outside the air handler. Drain s 2015 imc 307 2 2 requires that an air conditioning condensate drain inside diameter should not be smaller than in ch and should not be smaller than the drain pan outlet diameter. 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.

What is a p trap you say.