Deon Duncan – HVAC Training Video | Sanford Workshop Sept 2025

Hi guys, today I am going to be talking about filter driers. First of all, my name is Deon from HVAC Technical Academy. I will tell you guys about filter driers and where they are located.

Right here is a bi-flow filter drier. Right here is my condenser. In a condenser you have a reversing valve. As you can see right here, this is my liquid line and I have a bi-flow filter drier. Now I’m going to explain why I have a bi-flow filter drier on the liquid line to my condenser.

Inside the condenser you will have a reversing valve. The reversing valve reverses the refrigerant flow of the system. So, in order to reverse the refrigerant flow on your liquid line, you would have to have a bi-flow filter drier.

The bi-flow filter drier can be thought of like a filter in a car, or a filter in your air handler, or any kind of filter. The filter drier catches non-condensables and any condensables that are left over from the system or from the vacuum process. That’s really about it for filter driers. They just catch non-condensables that are left over from the system.

They can usually be located on your liquid line to your condenser, and with a bi-flow drier it will work in both directions because of the reversing valve. The reversing valve reverses the flow, so you have to have the bi-flow filter drier connected to your liquid line.

To get these on, you can braze them on. You can braze the filter drier onto the liquid line on both ends. Make sure it’s brazed on properly.

When do you actually remove the filter drier? You remove it when you have a leak or a major component removed. So if you have a compressor burnout, or your compressor or another major component needs to be replaced, that is when you replace your filter drier, or when there’s a temperature difference.

That’s really it about filter driers. I hope you enjoyed watching. My name is Deon from HVAC Technical Academy and I hope to see you again.