Why are there two condensate drains?

The main air unit is equipped with two condensate drain outlets: a primary drain for conveying water outside and a secondary drain as a backup, in case the primary becomes blocked or congested.

How much water should drain from air conditioner condensate drain?





5 to 20 gallons

Your air conditioner should naturally drain water that was once humidity out of your home. On average, you can expect 5 to 20 gallons of condensate per day. If water is not draining, your climate may be too dry or your system is not functioning properly.

Why is my AC overflow pipe dripping?

A clogged condensate drain pipe can make your AC system’s drain pan overflow. This is probably the most frequent cause of water leakage from a central AC system, bringing many service calls to HVAC professionals as summer temperatures rise. Drain lines can become clogged with dirt, rust, algae and other debris.

How do you know if your AC drain line is clogged?

A clogged AC drain line symptoms include:

  1. Musty, moldy smell near your indoor unit or in air from the registers/vents.
  2. Standing water near the indoor unit.
  3. Water damage in areas near the indoor unit.
  4. AC system is not cooling your home.
  5. AC system shuts down or doesn’t turn on.




What is a secondary condensate drain?

The secondary line is considered a backup line, so that if the primary line gets clogged, the condensate water will then go through the secondary line. The secondary line (usually a PVC pipe) will often end in a highly visible and conspicuous location.

Is a secondary condensate drain required?

3 A secondary condensate drain system is required not in every installation instance, but in every installation at which “where damage to any building components will occur as a result of overflow from the equipment drain pan or stoppage in the condensate drain piping”.

How do I keep my AC drain clear?

Keep your drain line clean by flushing it with vinegar solution every three months. You can also use warm water. Refrain from using bleach, however, as they can damage the PVC plastic pipes, as well as break down the cement joining the fittings together.

How do you unclog an AC drain line?



How to Unclog Your AC Condensate Drain Line

  1. Turn off your air conditioner. …
  2. Remove the cap from the pipe. …
  3. Check to see if there is any debris stuck in the drain. …
  4. Remove any visible debris and retest for proper drainage. …
  5. Pour in Vinegar. …
  6. Replace the drain cap. …
  7. Remove the drain cap.

Should there be water in AC drain pipe?

The condensate line should drain to the outdoors and during humid weather you should see plenty of water dripping from it. If it’s not dripping, it’s not draining! If there is standing water in the drain pan, your condensate drain is clogged!

How often should AC drain line be cleaned?

Kill any harmful bacteria or buildup and make sure your system continues to operate at peak performance by cleaning your drain line every 30 days.

How much does it cost to fix a clogged AC drain?



Clogged Drains
The expense of repairing this channel could range from $75 to $250. If the professionals who assist with AC replacement are required- to replace the entire evaporator coil, you need to pay between $400 and $950.

Where does the secondary condensate drain line go?

This secondary condensate drain pan also has its own drain line. It is connected directly from the pan to an external location, usually traveling out the window. It is highly visible. Homeowners should notice when the central air system reverts to this water removal method.

What is a secondary drain pan on an AC unit?

So for these instances, you should have a secondary drain pan, sometimes called a back-up drain pan. This is a large pan that is placed underneath the unit, and should be large enough to cover the length and width of the unit so it can collect any water that isn’t caught by the internal drain pan.

What is an auxiliary condensate drain?

An auxiliary drain pan with a separate drain shall be provided under the coils on which condensation will occur. The auxiliary pan drain shall discharge to a conspicuous point of disposal to alert occupants in the event of a stoppage of the primary drain.

Where does AC condensate drain go?



In newer homes, HVAC condensate drains are tied most often to bathroom drains. Common drain lines inside your home include in your bathrooms (sinks, shower or tub, toilet), kitchen (sink, water line to your freezer), laundry room, and water heater.

How much water is normal in AC drip pan?

Generally, AC drains water around 5 to 20 gallons per day, depending on how long the unit is running and the humidity level outside.

Where should furnace condensate drain?

The condensate drains out through a pipe, usually on the bottom of the furnace. Most high-efficiency furnaces also have a secondary drain line that comes out of the flue pipe. This secondary line is used to drain any residual moisture so it doesn’t leak into your furnace.

Should the condensate trap be full of water?

The boiler should never be operated without the condensate trap in place, as it prevents noxious combustion gases from travelling down the condensate pipe. Should the trap have to be removed from the boiler, it must be topped up with water when it’s replaced.

Why is there so much condensation in my furnace?



Again, the most common reason for a leaking furnace is a condensation leak. High-efficiency furnaces extract heat from the combustion gases for a longer period of time than a standard-efficiency furnace does, causing the gases to cool, then condense.