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STT40 / STT70
Maintenance 5-4
5.2. Preventative Maintenance
This section describes maintenance procedures which will increase the longevity and efficiency of
your dehumidifying dryer. Perform them at the regular intervals listed on the dryer checklist on
the previous page.
5.2.1. Servicing Process Air Filters
Caution! Operating the dryer without the process air filter installed voids
your warranty!
Dehumidifying dryers have a single cartridge canister-type filter
in the process air loop. The filter protects blowers from plastic
fines drawn in from the drying hopper and prevents the desiccant
from being contaminated. Regular filter cleaning is essential to
keep your dryer operating at peak efficiency.
You can blow or vacuum the dirt out of the filter with compressed
air, but remember, it could become damaged from high-pressure
blowing.
Set the “Timer” release switch to the position.
Recommendations for Cleaning and Replacing Filters
• Remove the threaded fastener securing the filter access cover, then remove the cover.
• Remove the nut on the center retaining rod to remove the filter cartridge.
/ Wait until the blower has stopped.
The blower will continue running for 10 minutes once the dryer is
turned off.
If there is a return air cooler installed, switch off the coolant circuit.
/ Switch off the dryer’s main power switch (the “power” signal
lamp turns off).
Interrupt the main power supply so that the device cannot be
turned on unintentionally.
Clogged filters substantially reduce the amount of circulating air
and lead to a production lag of your dryer. Clogged filters may
also damage the heating elements.