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"Oil-Less” Medical Air                                                              Medical Systems


               Appendix A - Desiccant Dryer


               A.3 Troubleshooting (continued)

                Problem             Possible Causes               Solution
                Dew point           Desiccant is contaminated.    Shutdown and depressurize the dryer. Inspect
                degradation         The “white” desiccant beads   the desiccant and replace if fouled.  Inspect
                                    may appear discolored and     any existing pre-filter if fouling is noted.
                                    dirty if contamination has
                                    occurred.

                                    Union or other                Soap test the dryer outlet manifold and piping
                                    piping/component leaks at     downstream of dryer. Repair all leaks noted.
                                    dryer outlet manifold or
                                    downstream of dryer outlet
                Back pressure on a   Dirty or fouled purge muffler   Switch off power and remove  purge  muffler
                desiccant chamber                                 and clean using an air nozzle, or replace.
                during the
                regeneration cycle.   Outlet check valve leaking   Replace check valve

               NOTE: The presence of backpressure will result in insufficient regeneration followed by dew point degradation. An
               off-line chamber’s pressure MUST be less than 3 psig throughout all regeneration cycles.














































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