Furnace Condensate Drain Pipe Size

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.

Furnace condensate drain pipe size.

This is what a service tech did to the vent. I removed the duct tape. Drain shall have a minimum slope of 1 8 ft verify pipe sizing and discharge requirements with local authorities and codes. This process creates condensate or moisture from the furnace s heat exchanger.

Condensate lines are typically made of plastic commonly pvc or sometimes metal although plastic is prefered. Pipe size shall not be smaller than drain pan outlet. Minimum size below grade and below ground floor shall be 2 1 2. Condensate waste and drain line size shall be not less than 3 4 in.

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. After the first stage the hot exhaust gasses are cycled through a second combustion stage resulting in exhaust with very little heat. Plastic with a separate drain installed under. So far i only get the run around and no answer.

So i am guessing they must be other high efficiency furnaces and i am guessing the small pipes are the condensate drains. Its job is to efficiently funnel condensation away from your hvac unit. The condensate pipe drains the moisture into a floor drain or household drain pipe. In another it looks like there is a small drain pipe inside the flue pipe leading out.

An auxiliary drain pan with separate drain. I have been trying to get an answer from the furnace company as to why this was done. It connects directly to the hvac unit and leads outdoors often through an exterior wall. 3 4 is sufficient for up to 20 tons according to the imc unless the drain outlet size is larger than 3 4.

In a couple cases it looks like there is a separate 1 2 or 3 4 pvc pipe coming out of the wall. An auxiliary condensate drain pan at least 1 5 deep and at least 3 larger than the length width of the appliance beneath which it is placed using corrosion resistant material of adequate thickness 0 7mm galvanized metal or 1 6mm non metallic e g. 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. Depth of trap must exceed by one pipe diameter the total static pressure of fan.

Can a condensate line coming off of the furnace to the floor drain have it s vent pipe covered with duct tape on the top. Where the drainpipes from more than one unit are manifolded together for condensate drainage the pipe or tubing shall be sized in accordance with table 307 2 2.