BeaconMedaes 4107 9006 25 Installation, Operation And Maintenance Instructions page 48

"Oil-Less" Scroll Laboratory Air
Appendix A: Desiccant Dryer
A.3 Troubleshooting
Problem
Dew point degradation
Back pressure on a
desiccant chamber during
the regeneration cycle.
NOTE: The presence of backpressure will result in insuffi cient regeneration followed by dew point
degradation. An off -line chamber's pressure MUST be less than 3 psig throughout all regeneration
cycles.
Possible Causes
Desiccant is contaminated. The
"white" desiccant beads may
appear discolored and dirty if
contamination has occurred.
Union or other piping/
component leaks at dryer outlet
manifold or downstream of dryer
outlet.
Dirty or fouled purge muffl er
Outlet check valve leaking
A-5
Solution
Shutdown and depressurize the dryer.
Inspect the desiccant and replace if
fouled. Inspect any existing pre-fi lter
if fouling is noted.
Soap test the dryer outlet manifold
and piping downstream of dryer.
Repair all leaks noted.
Switch off power and remove purge
muffl er and clean using an air nozzle,
or replace.
Repair check valve
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