There aren't many things more frustrating than an air conditioning that refuses to run. A hot, muggy home can make your space incredibly uncomfortable, which is why I have always focused on maintaining my air conditioning system. Unfortunately, I still run into problems from time to time and I am sure that all of you do, which is one of the reasons I decided to build this website. Check out these posts for more information about keeping your system working beautifully, even if you aren't naturally good at fixing things. You never know, making the right changes could dramatically improve your summertime experience.
An air conditioner's blower unit is responsible for both sucking air into the system and pushing cooled air out of the system and into a home. It therefore plays an important role in ensuring that air conditioner coils receive an adequate supply of air, something that usually goes a long way towards not only ensuring an efficient air conditioning process but also preventing airflow-related complications like evaporator coil icing. However, a blower is usually able to guarantee efficiency and complication-free air conditioning only when it is a perfect fit. When it is too powerful for the system, it usually leads to complications. One of the most common ones is air conditioner noise.
Why an oversized blower causes banging noises in the duct system
When a blower's fan rotates, it sucks air from the ducts. Normally, the ducts replace this air almost immediately. This is important as it helps to prevent the formation of a vacuum within the duct system. This ensures smooth airflow into the air conditioning system.
However, if the blower is oversized, the suction that it creates will be too powerful. It will not only draw all the air from the ducts, but also do this in an almost-immediate fashion. And since the air conditioner's duct system will be too small to keep up with the rate at which the blower sucks air from the ducts, there will always be an existing vacuum-effect. This is what then sucks the ducts in, causing the banging noise.
What you can do about the banging noise problem
Since the blower's sucking power is dependent on the rate at which its fan rotates, slowing down the fan's rotation is an easy way of reducing the noise-causing vacuum effect. To do this, simply install a fan control that will regulate the speed of the fan. However, it is important to note that this is not the most efficient solution to this problem especially as far as energy consumption is concerned.
It is also possible to reduce the banging noises by increasing the number of return air inlets in such a way that they can accommodate the excess suction created by the oversized blower. The increased air supply from the added inlets will reduce the risks of vacuum formation and will reduce the amount of pressure that is exerted on the walls of the ducts. You can also fix this noise problem by having a HVAC contractor replace your blower with one that is the right fit. Talk to a contractor like Kayvon HVAC for more information.