Air Dryers—A-4400 Series Technical Bulletin
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Figure 6: Particle Filter/Auto Drain Replacement
The coalescing oil removal filter is equipped with an automatic drain for
discharging accumulations of entrapped liquids. This filter also features a
pressure drop indicator integral to the top of the unit (refer to Figure 7).
On a new filter, this indicator is green in color. As the pressure drop
across the filter increases, a slide within the indicator moves, bringing
some red color into view. When the pressure drop reaches 7.5 psig
(52.5 kPa), the indicator becomes entirely red, indicating that the filter
element needs to be replaced. Even if the indicator is not entirely red, it is
recommended that the filter element be replaced annually.
Coalescing Oil
Removal Filter
