This will kill any algae mold or mildew that has formed in the pipe.
Drain pipe hvac condensate drain line design.
Condensate overflow due to a blocked drain may be caught by an overflow pan beneath the air.
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.
Plumbing code citation for installation of air conditioning condensate drain piping.
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.
If the condensate drain line is clogged you will need to use a wet dry vacuum or a special pump to unclog the line.
Just pour a cup of bleach in the drain line s access opening near the indoor air conditioning unit.
This biological growth may migrate into the condensate drain line or the drain trap and form a blockage.