Here are the steps on How to install an AC drain line

1. Locate the condensate drain line on the outside of your home. It is usually a small, clear plastic line that runs from the bottom of your air conditioner to the ground.
2. If the drain line is not already connected to a drain, you will need to do so. You can connect it to a sink, a sump pump, or a sewer line.
3. Make sure that the drain line is sloped downward so that the condensate will flow freely. The slope should be at least 1/4 inch per foot.
4. If the drain line is long, you may need to install a condensate pump to help the condensate flow.
5. Once the drain line is installed, you should test it to make sure that it is working properly. You can do this by turning on your air conditioner and pouring water into the condensate drain pan. The water should flow freely out of the drain line.

Here are some tips for proper AC drain line installation:

• Use the correct type of drain line. The drain line should be made of a flexible material that will not kink or collapse.
• Insulate the drain line. This will help to prevent the condensate from freezing in cold weather.
• Use a condensate trap. A condensate trap will help to prevent sewer gas from backing up into your home.
• Clean the drain line regularly. This will help to prevent clogs.

Here are some common mistakes to avoid when installing an AC drain line:

• Not sloping the drain line correctly. This can cause the condensate to back up and overflow.
• Not using the correct type of drain line. A rigid drain line can kink or collapse, causing a clog.
• Not insulating the drain line. This can cause the condensate to freeze in cold weather, causing a clog.
• Not using a condensate trap. This can allow sewer gas to back up into your home.
• Not cleaning the drain line regularly. This can cause clogs.