Air Conditioner Condensate Drain Code Requirements: 6 Aspects You Need to Know

What are the air conditioner condensate drain code? This code is widely used to properly dispose of air conditioner drain. The widely used reference is the IMC, which stands for International Mechanical Code. The reference was issued in 2015. To know what this code is about, you can read it in the article below.

Condensate Drain Code Requirements

Before getting too far, you first need to know that different places will provide different codes. However, the IMC is what is often used in many places in America.

There are many aspects that are related to the condensation drain and how it should be disposed of. A further explanation will be provided as follows.

  1. Condensation disposal

According to the IMC, how you dispose of the condensation ‘product’ must be in approved location. For many people, this is pretty vague since there are many approved locations according to different opinions of people.

air conditioner condensate drain code

Then it is later explained that you must not dispose the condensation product on streets, alleys, or any types of walkways. The reason is clear: it causes nuisance for people that pass on it.

Further explained that the condensation disposal should not be disposed on places:

  • You should not dispose of the condensation disposal product in places that may cause people to slip.
  • You can’t dispose of it on a roof.
  • You cannot dump it in places like basements, foundations, or any areas which will cause leakage, erosion, or ponding.

In addition, you should also remember that discharging it onto a sewer system should not be piped.

  1. Drain size

Aside from ruling out where you can dispose of your condensation product, the drain condensation inner diameter must not be less than 0.75 inches.

  1. Pitch of drain

To make proper condensate drain piping, you need to add 1% as the minimum pitch. For example, you can make a fall of 0.125-inch every 1-foot of horizontal run.

However, according to sources, it is easier for you to make a ¼-inch fall for each foot. Not only does it ensures better drainage, but it also gives you some room for errors.

  1. Materials and support

According to the IMC, the most-used condensate drain pipe material to use is PVC. When you pick a drainpipe with this material, the air conditioner condensate drain code mentioned that you need to have it supported every 4’ when placed horizontally. While placed vertically, you need to support the drain every 10’. Make sure that the pitch is still kept well.

  1. Drain insulation

According to the IMC code, it isn’t well stated that the drain line needs to be insulated.

However, there is a statement in the IMC code that mentions: mechanical system piping that’s capable of carrying fluid with a temp more than 40oC or lower than 13oC to be insulated with an R-value of R-2 (minimum).

Some states in the US require you to provide insulation to prevent condensation. If not, it may create dews (especially in a hot and humid area), leading to water damage issues.

  1. Cleanout

The IMC 307.2.5 mentioned that the condensate assemblage needs to be installed properly. This helps the drain line be cleared from blockages and help them to work nicely.

So, those are the requirements you need to understand to make your condensate drain work properly. Not only that but following the guideline in this code may also help you maintain the equipment works nicely without frequent damages to fix.

Remember, the air conditioner condensate drain code may differ from places to places. It is essential to learn what rule is applied in your state, not just learning the most common one, IMC.

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AirconMag is an experienced author and Air Conditioner expert. With years of practical experience in the field authored several informative articles on various aspects of AC unit, including installation, maintenance, and repair