Sterling STT70, STT40 manual Preventative Maintenance, Servicing Process Air Filters

STT40 / STT70

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.

Maintenance 5-4