Dry siphon for air conditioning

Dry siphon for air conditioning: what is it?

During the operation of the split system, condensate is formed, which must be removed outside the room. Most often, a drainage tube is used to drain condensate. It is brought out to the street through a hole in the wall. Excess water flows by gravity from the air conditioner to the street. However, according to the mind, the condensate should not flow down to the street, but directly into the sewer.

But the drainage can not be removed directly into the sewer pipe, because in this case, fetid odors and toxic gases will freely enter the room. To avoid this trouble, it is necessary to use the so-called drainage siphon for air conditioners.

A siphon for the drainage of air conditioners is installed on the way to the sewer pipe. It prevents the penetration of odors, but at the same time it passes condensation. The most modern version of this device is a dry siphon for air conditioners.

A dry shutter for air conditioners is a modern and effective way to drain condensate. In this article, we will tell you in detail what a siphon is for draining condensate from an air conditioner and what are the advantages of this device.

General information

anti-odor valve for air conditioner

Siphons with a hydraulic lock are mandatory assistants for every owner of an air conditioner. An ordinary siphon for the drainage of an air conditioner (not dry) is arranged in such a way that excess condensate flows into the sewer without problems, but at the same time the entry of an unpleasant smell into the room is blocked.

The main disadvantage of a conventional drip siphon for an air conditioner is that the water in it periodically stagnates. In addition, such a drainage siphon of split systems is inconvenient to clean. Sooner or later it will have to be replaced, since such conditions create a favorable cut for the development of bacteria and mold.

To solve this problem, a dry siphon for an air conditioner was invented. It is also effective against odor, but the water does not stagnate in it. In addition, dry siphons are easier to maintain. They are more durable and more convenient to use. At the same time, they are more expensive, but the difference is insignificant.

Let’s get acquainted with the key advantages of a siphon for an air conditioner with a dry shutter.


The dry siphon for draining the air conditioner into the drain sewer has several important advantages:

  • Does not allow fetid odors and toxic gases to enter the room, regardless of the amount of condensate and the intensity of operation of the air conditioner;

  • Condensate does not stagnate in the siphon, so pathogens are not formed in such large quantities as in a conventional siphon;

  • It works as a non-return valve, so water from the sewer will not be able to enter the room;

  • It has smaller dimensions compared to a conventional siphon;

  • Allows you to install in different positions.

Let’s take a closer look at the installation of the siphon for the condensate of the air conditioner.


air conditioner siphon

There are several ways to install a siphon for an air conditioner in a drain sewer. Unfortunately, there is no clear installation instructions, because everything depends on the features of the hydraulic lock for the air conditioner, the location of the sewer pipe and other nuances. But we will tell you about the basic types of installation, so that you can have a general idea about the performance of the work.

So, the methods of installing a siphon for draining air conditioners into the sewer:

  • Vertical mounting. The siphon is installed vertically, while the outlet of the siphon should be located at the bottom;

  • Horizontal mounting. It is installed horizontally, but at a slight angle, so that the water can flow by gravity into the sewer;

  • Custom installation. In theory, a dry siphon for an air conditioner can be installed at any convenient angle, but the side with the corrugation should look at the floor.

There is no better way to install it. Again: it all depends on the characteristics of the sewer pipe and the amount of condensate that the siphon should pass.


The condensate should be drained directly into the sewer, and not into the street. But for these purposes, it is necessary to use a water seal for an air conditioner, which is also called a siphon for an air conditioner with a dry shutter.

If you have ever used siphons with a hydraulic seal before, share your experience in the comments below. It will be useful for many readers. Also read other articles on our website. Here you will find a lot of useful materials about the installation and operation of air conditioners. We wish you good luck!

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