When most homeowners think of AC system filters, they envision pleated air filters, which are found in most residential AC systems. They are designed to remove contaminants from the air. But there’s another filter that often goes unnoticed: the filter drier.
What Is a Filter Drier?
A filter drier is a filtration device that’s designed to remove contaminants, including moisture, from the refrigerant. There are two types of filter driers.
Liquid-line Filter Driers are installed within the smaller, non-insulated copper line that carries refrigerant from the condenser coil to the evaporator coil.
Suction-line Filter Driers are installed within the larger, insulated copper line that carries refrigerant from the evaporator coil to the condenser coil.
Both types serve the same purpose. As refrigerant travels through a filter drier, it will be cleaned. The filter drier will both “filter” and “dry” the refrigerant. It will filter the refrigerant by removing debris and particulate matter from it, and dry the refrigerant by removing moisture.
Prevents Refrigerant From Freezing
Your AC system needs a filter drier to prevent refrigerant from freezing inside of it. Under normal circumstances, refrigerant shouldn’t freeze. As long as your AC system is fully charged, the refrigerant will be able to travel through it without freezing.
If moisture enters your AC system and mixes with the refrigerant, it may freeze up. These ice blockages will then restrict the flow of refrigerant, preventing your AC system from working correctly.
Discourages Acid Formation
Filter driers protect against acid formation. When moisture mixes with refrigerant, it can cause chemical reactions. Acid may form inside of your AC system from these chemical reactions. Fortunately, a filter drier will prevent this from happening by removing moisture from the refrigerant
Prolongs Life of Compressor
Most compressors have a lifespan of about 10 to 15 years, but they can fail prematurely due to contaminants. A properly working filter dryer can help to prolong the life of your AC system’s compressor by keeping it safe from these harmful contaminants.
If you are experiencing a problem with your air conditioning or heating call us at 512-336-1431 to schedule an appointment. We’ll be glad to come out and take a look at the issue.
1431-183 A/C & Heating proudly serves Round Rock, Georgetown, Cedar Park, Pflugerville, Leander, Liberty Hill, and North Austin.
is a dry filter supposed be installed on a residential central air unit at installation
Hi Bruce – I spoke with Mike about this and here is his answer: If the dryer is not already installed at the factory then it is required to be installed upon installation of a condensing unit. If you need further help give us a call at 512-336-1431.