Hvac Drain Line Size

Clean out your drain line with bleach in early springtime each year to kill mold and mildew and prevent future clogs.

Hvac drain line size. Slope the drain shall have a slope of not less than 1 8 inch per foot and shall be approved corrosion resistant pipe not less in size than 3 4 of an inch for air cooling coils and not less than the drain outlet size for evaporative coolers or other equipment. This will kill any algae mold or mildew that has formed in the pipe. If you re planning to tie two evaporator drains into one single drain line they may want you to increase the size of the final pipe going to the outside. 3 4 is sufficient for up to 20 tons according to the imc unless the drain outlet size is larger than 3 4.

Make sure to check the installation manual if you have two systems. Imc 307 2 2 tells us that an a c condensate drain inside diameter should not be smaller than 3 4 and should not be smaller than the drain pan outlet diameter. You ll know your ac drain line is clogged if you see water pooling in the pan underneath the unit inside your home. The line sizes given on the specification sheets are based on a 5 pound pressure drop for the entire piping run from 50 to 250.

Just pour a cup of bleach in the drain line s access opening near the indoor air conditioning unit. At 150 equivalent feet a 1 2 line would be required for the same load point b. 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. 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.

A 25 000 btuh load will require a 3 8 line for 100 equivalent feet point a. Public way condensate or wastewater shall not drain over a public way. To clear these clogs you will need to suck them out with a wet dry vac. If the condensate drain line is clogged you will need to use a wet dry vacuum or a special pump to unclog the line.

The code book says the size of the pipe is for one or a combination of units or as recommended by the manufacturer. Plumbing code citation for installation of air conditioning condensate drain piping.