Sterling STT40, STT70 manual Air Filter Location & Disassembly, DO NOT clean/wash filter with water

STT40 / STT70

5.2.2. Cleaning or Replacing the Return Air Filter

STT40 / STT70

•Detach the screw on the housing of the return air filter and remove the housing cover.

•Remove the nut of the filter cartridge.

•Remove the filter cartridge.

•Clean the inside of the return air filter housing. Use non-fibrous cleaning cloths or an industrial type vacuum cleaner.

•Vacuuming - Try vacuum-cleaning a soiled filter first. Vacuuming removes most large particles and surface contaminants, and may suffice for the first time you clean a filter. Use a commercial-duty (recommended) or household vacuum cleaner. Vacuum the filter from the air intake (dirty) side only.

•Cleaning with Compressed Air - Blow clean, dry compressed air up and down the pleats, blowing from the inside out. Remove loose dirt from the filter with compressed air or vaccum from the outside.

Figure 1: Air Filter Location & Disassembly

Return Air Filter

)DO NOT clean/wash filter with water!

•After each cleaning:

•Inspect the filter element. Briefly hold a light bulb behind the element and look for any fatigued paper or residual dirt. Inspect for holes and tears by looking though the filter toward a bright light. Check for damaged gaskets or dented metal parts. Do not re-use a damaged filter!

•Check the gasket for damage. A damaged gasket allows contaminants into the process. Replace as needed.

•Re-install the cleaned/new filter cartridge.

•Rethread the nut that holds the filter in place.

•Install the lid of the return air filter housing.

)Never operate the dryer without a return air filter.

Purchase order numbers for a return air filter on the STT40/70 dryer are:

when operating without return air cooler: ID 83957

when operating with return air cooler: ID 83956

Maintenance 5-5