4-2
-40C Lab Freezer
VWR International
Section 4
Maintenance
Defrost the Chamber
1. Remove all product and place it in another freezer.
2. Turn the unit off and disconnect it from the power source.
3. Turn off the power switch (see Figure 1-5 for location) to the
battery(s).
4. Open all of the doors and place towels on the chamber floor.
5. Allow the frost to melt and become loose.
6. Remove the frost with a soft cloth.
7. After defrosting is complete, clean the interior with a non-chloride
detergent. Rinse thoroughly with clean water and dry with a soft cloth.
8. Plug unit in and turn power switch on.
9. Turn the battery power switch to Standby mode ( ).
10. Allow the freezer to operate empty overnight before reloading the
product.
Cleaning the door gasket a minimum of once a month is recommended.
Using a soft cloth, remove any frost build-up from the gasket and door(s).
The door gasket may need to be cleaned more frequently if dirt or
excessive frost build-up prevents the door from closing properly.
Cleaning the vacuum relief port aminimum of once a month is
recommended.
The exterior door gasket provides an excellent seal that protects product,
provides an energy efficient thermal barrier to keep cold air in and room
temperature air out and reduces frost build up on the inner doors.
Because the door gasket seals so well, a vacuum can be created after a door
opening. Warm air enters the cabinet, cools and contracts, creating a
vacuum that pulls the door in tightly against the seal.
To equalize the pressure inside the cabinet after a door opening requires
1.5-3.0 cu.ft. of ambient air to be drawn into the cabinet. The amount of
air required to equalize the pressure varies depending on the cabinet size,
cabinet temperature, duration of door opening, inventory volume and the
temperature/humidity of the ambient air. The unit is designed with a
“vacuum relief port” that allows the pressure to be equalized.
Clean the Door
Gasket
Clean the Vacuum
Relief Port
Summary of Contents for 5720 Series
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Page 67: ...11 6 40C Lab Freezer VWR International Section 11 Appendix ...
Page 68: ...VWR International P O Box 5015 Bristol CT 06011 8960 www vwrsp com ...