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"Oil-Less” Medical Air Medical Systems
Appendix A - Desiccant Dryer
A.1 General Information (continued)
A.1.2 Pre-filter
As the first line of defense against water contaminants, a coalescing pre-filter with an automatic drain is installed.
The LifeLine coalescing pre-filter removes water aerosols from the gas stream before the gas enters the dryer.
Liquids collected by the assembly's filter cartridge(s) fall to the housing sump and are drained by a float drain.
A.1.3 Automatic Drain Valves
As previously stated, the accumulated water collected by a pre-filter must be periodically drained from the pre-filter
housing sump. An automatic drain valve is a recommended and reliable means of removing collected moisture from
coalescing pre-filter housings and other components requiring periodic draining.
A-2
