AEC Continuous Vacuum/Pressure Conveying Systems - Manual (Page 53)

Page 52 Single- and Dual-Blower Continuous Vacuum/Pressure Systems
Periodic Checks and Inspections
; Check the solid state modules on solid state units with the optional Test Unit
as desired.
; Repair the upper or lower valve, if either malfunctions, on the vacuum unit of
solid state systems (relay systems do not have non-reversing valves).
Note: Refer to the appropriate component literature for the lubrication and maintenance of
such companion equipment as rotary airlocks, filter chambers or receivers,
aftercoolers, etc.
6-4 Maintaining Filter Chambers
VFC filter chamber maintenance is much easier if you use vinyl flex hose for making
the final connection to the cover.
To check the filter element:
1. Unlatch the clamp that secures the cover assembly.
2. Lift off the cover and look for element fouling or wear:
• If the filter is worn, replace with P/N A0547008 (VFC225) or P/N
A0547007 (VFC1000).
• If the filter is lightly soiled, remove the filter and clean with compressed
air. Blow it out from the inside.
3. To remove the filter:
• Note the orientation of the components.
• Unscrew the retaining cover.
4. Wipe down the gasket and filter retainer/VFC cover mating surfaces to ensure
a good seal.
5. Blow out the cartridge filter with compressed air. Blow from the inside out.
Make sure that compressed air pressure is less than 100 psi (689.5 kPa/6.9
bars) to keep from collapsing the filter!
6. Re-install the filter and filter retainer. Do not over tighten the retainer. A snug
fit is required for a proper seal.
7. Secure the cover assembly with the clamp.
• Periodically inspect the flapper assembly gasket and disk for signs of
wear. A good vacuum seal is important for proper operation.
• Periodically inspect the flapper dump assembly for proper operation. The
flapper should swing freely.