P Trap Hvac Condensate Drain Line Design

Accepted design for a negative pressure p trap.

P trap hvac condensate drain line design. All air conditioners have a special drain for. Minimum h fan outlet pressure in. If fan is located before the coil in the system the fan will push small amount of air and water down condensate drain. Geometry dimensions that match the drain pan pressure.

Viper condensate pan and drain treatment is a sprayable gel. Having a single trap for multiple units is a poor way to design a condensate trap. If fan is located upstream of coil fan will pull water up drain line counter to water flowing down drain. Air conditioning units pull a lot of water out of the air.

That is why in the summer your car drips water. Minimum maximum sea level. There can be a scenario where the fans of connected units are operating at different static pressures. If there is a drain line of considerable length that has pockets of water remaining in the line after condensate ceases then the evaporation rate in a p trap could be as low as 1 1 inches per month.

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. Model building code requirements for a trap on the hvacr condensate drain system section 407 2 4 traps requires that condensate drains shall be trapped as required by the equipment or appliance manufacturer we interpret this provision to defer to the equipment manufacturer s installation instructions. In arid regions the evaporation rate will be higher up to 3 inches per month. It coats the pan p trap and drain piping with a lubricative film to improve flow and prevent future soil adhesion.

What is a p trap you say. And a method for preventing trap freeze up in sub freezing environments. A p trap serves a very important purpose on an a c unit. See when moist air hits something cold the water condenses out of the air and collects on the cold surface.

W c 1 in. I am not sure about code but the need for a trap will depend on design of a c system. Fan inlet pressure negative h figure 3. A p trap is needed to block air and allow condensate to drain properly.

The drain system design features necessary for acceptable condensate trap performance include. Condensate comes from evaporator coil. The unit operating with greater static pressure will result in drawing air through the drain line of another unit. W c 1 2 in.

Trap for draw thru unit condensate beginning to drain away. Co ndes at r i p r ec om ndati. Condensate drain pan h 2 minimum sea level when condensate begins to drain off h fan inlet pressure in. The slow dissolving enzyme gel will outperform and outlast conventional tablets and strips.