Welch Vacuum 2028 Self-Cleaning Dry Vacuum System - Manual (Page 11)

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Change Cleaning Time
To change cleaning time, select through the MENU SCREEN:
SETUP > SET CLEANING TIME.
Select Cleaning Time
To set cleaning time, chose the appropriate time from the
SELECT CLEAN TIME SCREEN; default value is 120 seconds.
Use longer clean times to purge low-volatility solvents.
Unit Software Information
To retrieve information about the unit, select through the MENU SCREEN:
ABOUT.
Model / Software Version / Contact
are displayed as shown in this Figure.