Drain Pipe Hvac Condensate Drain Line Design. 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. Just pour a cup of bleach in the drain line s access opening near the indoor air conditioning unit. 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. 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.
Condensate overflow due to a blocked drain may be caught by an overflow pan beneath the air.
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. Uniform mechanical code section 310 0 310 1 condensate disposal. 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.
