Filter Driers

Filter driers are units utilized in a HVAC system which might be a mixture of filter and dryer (or drier). A filter is used to take away any particle corresponding to filth, steel or chips from getting into the refrigerant movement management. The refrigerant movement management system may very well be thermostatic enlargement valve or just a capillary tube.

The filter is usually additionally known as a strainer. It’s essential that these particles are filtered out and prevented from going into the metering system. It will probably trigger blockage to the passage movement of the refrigerant within the enlargement valve and trigger improper operation to the system.

A drier as its identify suggest is used to take away the moisture from the refrigerant. Typically it is usually known as dehydrator or dryer. It’s essential to take away moisture from the system in any other case it could freeze contained in the tube inflicting the movement of refrigerant to be restricted. The moisture can even trigger the formation of acids and sludge when in touch with oil within the system.

These units are normally utilized in larger system the place the refrigerant circuit is designed for area service. Residential models which might be charged with refrigerant at manufacturing facility stage and hermetically sealed don’t use these units as the potential for moisture and particles getting into the system is minimal.

Kinds of Filter

There are mainly two varieties in used at present.

• Liquid Line Sort
• Suction Line Sort

Liquid Line Sort is positioned after the condenser coil and earlier than the enlargement valve. The liquid refrigerant that flows from the condenser to the enlargement valve is filtered from particles and moisture earlier than getting into it. Good filter will filter out particles which might be 20 micron or above from the system.

Some increased finish system has sight glass that allows the technician to look into it to see the extent of refrigerant. Some have chemical in it that point out the quantity of moisture within the system primarily based on the colour of it.

The Emerson EK-164 liquid line drier proven beneath is ready to take away moisture and acid from the liquid refrigerant. It will probably additionally take away particles which might be larger than 20 micron from the refrigerant system.

It has a most working stress of 680 psig and painted with a corrosive resistance epoxy powder paint. Appropriate for outside set up.

Suction Line Sort is positioned after the evaporator and earlier than the compressor. This system is used to guard the compressor particularly after any failure that contaminates the system.

Motor failure within the compressor normally trigger acid and different contaminants to be launched into the refrigerant system therefore it is very important have the suction line filter dryer put in.

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