Furnace Condensate Drain Pipe Size

Drain shall have a minimum slope of 1 8 ft verify pipe sizing and discharge requirements with local authorities and codes.

Furnace condensate drain pipe 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. In another it looks like there is a small drain pipe inside the flue pipe leading out. Its job is to efficiently funnel condensation away from your hvac unit. 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.

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. Condensate lines are typically made of plastic commonly pvc or sometimes metal although plastic is prefered. Plastic with a separate drain installed under. So i am guessing they must be other high efficiency furnaces and i am guessing the small pipes are the condensate drains.

It connects directly to the hvac unit and leads outdoors often through an exterior wall. In a couple cases it looks like there is a separate 1 2 or 3 4 pvc pipe coming out of the wall. Minimum size below grade and below ground floor shall be 2 1 2. After the first stage the hot exhaust gasses are cycled through a second combustion stage resulting in exhaust with very little heat.

Condensate waste and drain line size shall be not less than 3 4 in. Internal diameter and shall not decrease in size from the drain pan connection to the place of condensate disposal. I have been trying to get an answer from the furnace company as to why this was done. Enter the condensate line which essentially functions as a drain line.

An auxiliary drain pan with separate drain. This process creates condensate or moisture from the furnace s heat exchanger. 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.

Where the drain pipes 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 i interpret this to mean for more than one unit the total capacity should be used to size the collective condensate drain per table 307 2 2. Depth of trap must exceed by one pipe diameter the total static pressure of fan. This is what a service tech did to the vent. 3 4 is sufficient for up to 20 tons according to the imc unless the drain outlet size is larger than 3 4.

I removed the duct tape. The condensate pipe drains the moisture into a floor drain or household drain pipe.