Hvac Drain Line Size

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.

Hvac drain line size.

Carson dunlop associates sketches left illustrate both acceptable and not recommended locations for the discharge of an air conditioner or heat pump condensate drain line discharge. If the condensate drain line is clogged you will need to use a wet dry vacuum or a special pump to unclog the line. Plumbing code citation for installation of air conditioning condensate drain piping. You ll know your ac drain line is clogged if you see water pooling in the pan underneath the unit inside your home.

Make sure to check the installation manual if you have two systems. Uniform mechanical code section 310 0 310 1 condensate disposal. This will kill any algae mold or mildew that has formed in the pipe. A 25 000 btuh load will require a 3 8 line for 100 equivalent feet point a.

Clean out your drain line with bleach in early springtime each year to kill mold and mildew and prevent future clogs. Public way condensate or wastewater shall not drain over a public way. 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 liquid 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. 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. 3 4 is sufficient for up to 20 tons according to the imc unless the drain outlet size is larger than 3 4.

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. 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.