Maintenance
July 22, 2019 | 287960-ENG | R00 49
6.5 Maintain the Ultrasonic Humidity System (USH)
Clean the USH box every month and replace the ceramic dics every six months to maintain
optimal performance. When not in use, the USH box (located inside the machine compartment),
must be drained and cleaned. Close the water supply valve while not in use.
Set a moderate RH value in all programs to keep the USH feature operable without significantly
affecting the experiment.
To remove and clean the USH box:
1. Shut off the water supply valve to the chamber and disconnect the water line from the
USH box (Figure 6-3, Detail A).
2. Remove the USH access panel at the back of the chamber by removing the four
screws (Figure 6-3, Detail B).
3. Gently pull the USH tank out of the back of the chamber, being careful not to tip the
box (Figure 6-3, Detail C and D).
Figure 6-3 Remove the USH Box from the Chamber
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