vwr.com I Instruction manual VWR
®
ULT Freezer 352/528 Eco Premium 02/2022
Page 74/86
(E2)
(E2)
(E1)
(E)
Figure 21: Removing the condenser air filter
(E) Air filter flap
(E1) Condenser air filter
(E2) Quick locking screws
Fix the condenser air filter and the air filter flap correctly following cleaning or replacement.
23.3.2 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.
23.3.3 De-icing and defrosting
We recommend for material that could be damaged already by slight warming, to provide ad-
equate storage facilities (e.g., in a second chamber / with liquid nitrogen).
Ice may form in the upper area of the freezer and on the interior 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.
Note: If the door has not been opened for a longer period of time (more than 5 days), it is advisable to de-
ice the door gaskets and the inner opening of the pressure compensation valve (I). After that, the door can
be opened even after a short period of time without applying great force.
After an extended period of operation, defrosting may become necessary.