HVACR: How To Check A Filter Drier For An AC/Refrigeration System? Suction/Liquid Line Filter Drier

HVACR(Heating, Ventilation, Air Conditioning/Refrigeration) How To Check A Filter Drier For An AC/Refrigeration System? Liquid Line Filter Drier/Suction Line Filter Drier (HVAC Filter Drier Troubleshooting)

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t's time to turn our attention to another pair of standard fittings in liquid lines: the filter drier and the sight glass. The importance of these two components is often (and undeservedly) underestimated. The filter drier and sight glass protect the refrigeration system and provide an important indication of any problem involving the refrigerant, moisture, or contamination in the system.

Filter driers are usually installed in the liquid line of a dry-expansion refrigeration system, where they have a dual function. First, they trap coarse particulate contamination and copper shavings, and second, they capture any moisture present in the system. For this purpose, modern filter driers are equipped with a drier core consisting of a 100% molecular sieve for optimal drying performance and filtering. The filter drier should be replaced each time the refrigeration system is opened.

There are many different models of filter driers. Standard models (such as DML) are most commonly used in commercial plant construction. They have a solid core that is permanently bonded to a compact housing.

These standard driers are designed for only one direction of flow, as indicated by an arrow on the drier housing.

This is usually fully adequate. However, if you encounter a situation with bi-flow operation, such as a heat pump system with a four-way reversing valve, you can either arrange two standard driers in parallel with opposing flow directions and fit each of them with a check valve in the appropriate flow direction, or instead select a bi-flow drier (such as the Danfoss DMB).

Bi-flow driers can be used with liquid flow in either direction without the risk that previously filtered out foreign matter will subsequently be released into the system.

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