What Is a Condensate Drain Pan?
The primary purpose of a condensate drain pan is to collect water created during the process of cooling the air pushed through an air conditioning system.
AC units contain an evaporative coil made of metals that are efficient at conducting heat. Refrigerant is pulled through the tubes of the evaporative coil after passing through an expansion valve. The expansion valve releases pressure from the liquid coolant, rapidly cooling it and then exposing it to the coils where it becomes cool air. It’s this process of exposure to heat that creates water condensation.
Most window air conditioner units are designed with a slight tilt so that this water can pour out the back of the unit, which explains the drip you sometimes feel when walking down a street that’s spotted with window air conditioner units.
In a standing unit, however, condensation is collected in a shallow pan that’s about 1" deep and is attached to a drain and pump that drains the water out to the drain line.
Where Is the Condensate Drain Pan?
You may need to know how to access the condensate pan if you’re experiencing leaks or suspect water damage. There are a few reasons why the condensate pan might overflow.
1. Shifted pan
If the condensate pan becomes tilted it may start to fill too quickly, causing it to overflow.
2. Blocked line
A clog may prevent the drainage system from emptying the collected water.
3. Excessive flow
If the refrigerant cools heat from the coil too rapidly, ice may form, causing an excess of liquid once the ice begins to melt.
Knowing how to get to the air conditioning coil and condensate drain pan can help you assess if one of the above issues is occurring. Most units serve as both heating and cooling systems, so you might also ask, “Where is the condensate drain pan on my furnace?” The location of these things likely depends on the type of unit you have and where it is located.
Vertical
In vertical units, typically found in tight spaces or closets, the coils are located at the top of the furnace, with the drain pan just below.
Horizontal
In horizontal systems, air flows to the side because the cooling unit is usually located on its side to allow for lower ceilings. You’ll find the coils to one side of the unit, with the condensate pan below and the ducts nearby.
Knowing the location of the air conditioning coil and condensate drain pan on standing units can help you troubleshoot a problem, and if necessary replace a condensate drain pan.
Product Compliance and Suitability
The product statements contained in this guide are intended for general informational purposes only. Such product statements do not constitute a product recommendation or representation as to the appropriateness, accuracy, completeness, correctness or currentness of the information provided. Information provided in this guide does not replace the use by you of any manufacturer instructions, technical product manual, or other professional resource or adviser available to you. Always read, understand and follow all manufacturer instructions.