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UF V (E3) 10/2020 Page 94/119
25.2.2 Cleaning the condenser
Every 6 months remove by suction any visible dust on the condenser lamellas with a vacuum cleaner. If
appropriate, blow through the lamellas with compressed air.
With an increased amount of dust in the ambient air, clean the condenser several times a year. In this case
we recommend to weekly check the condenser lamellas (behind the air filter flap (E). If soiling is visible,
turn off the chamber and remove the dust by suction from the condenser lamellas.
25.2.3 De-icing and defrosting
We recommend for material that could be damage already by slight warming, to provide ade-
quate storage facilities (e.g., in a second chamber / with liquid nitrogen).
Ice may form at the upper part of the chamber and on the inner doors. Excessive frost may lead to increas-
ing the inner chamber temperature. Remove the frost on the doors with the ice scraper (part of the optionally
available deicing kit).
Regularly (recommendation: every month) remove the frost on the doors with the ice
scraper.
After an extended period of operation, defrosting may become necessary:
To defrost the entire chamber, proceed as follows:
• Turn off external protocol systems (option) if applicable.
• Place the stored material in another freezer or in a container refrigerated by dry ice or liquid carbon
dioxide.
• Turn off the chamber at its main power switch (4) and disconnect it from the power supply.
• Open the outer door and all inner doors.
• Place absorbent towels on the bottom of the inner chamber or mount the optional drain well (chap. 2.5)
and allow the frost to melt.
NOTICE
Risk of damage to the interior through scraping and piercing with a sharp instru-
ment.
Damage to the chamber.
∅ NEVER use tools with a sharp edge to remove the frost.
Use the supplied ice scraper only.
• Wipe up the accumulated water with absorbent towels
• Let the interior of the freezer dry. Clean and decontaminate it as described in chap. 24
When taking the chamber into operation again, please follow the hints given in chap. 6.2.
• Connect the freezer to the power supply and turn it on with the main power switch (4).
• Operate the chamber for at least 9 hours. Then introduce the material into the freezer.
• Turn on external protocol systems (option) if applicable.
When defrosting, water may accumulate on the shelves and the bottom. Procedure to remove it:
• Carry the water from the freezer shelves and bottom with the wiper into the drain well (option, chap.
2.5).
• Then dry all inner chamber equipment with an absorbent towel.
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