Leica Biosystems CM1860/CM1860 UV - Manual (Page 52)

52 Instructions for Use V1.4 – 10/2012
7.5 Defrosting
Defrosting the cryochamber actually means defrosting the evaporator to
prevent excessive frost buildup. The evaporator is flushed with hot gas
during defrosting. The cryochamber virtually is frostfree and does not need
to be defrosted.
The condensation water that is produced during defrosting is collected in a
container, which is located at the front of the cryostat cabinet.
To make sure that the condensation water stemming from the de-
frost cycles drains into the waste container and to avoid the risk of
possible contamination, ensure that the tap of the waste container
(2, Fig. 54 ) is open whenever operating the cryostat.
Only shut the tap when draining the waste container!
The quick freeze shelf is cooled during the automatic cryochamber
defrosting. However, the Peltier element is turned off.
The maximum duration of a defrost cycle is 12 minutes. Defrosting
is terminated automatically once the cryochamber has reached a
temperature of -5 °C. Cooling turns back on automatically.
7.5.1 Automatic defrosting of the cryochamber
An automatic defrost cycle takes place once in 24 hours.
You can program the time of the automatic defrost cycle on control panel
field 1 ( see item 6.2.2 ).
7.5.2 Manual defrosting of the cryochamber
To avoid an unintended defrosting, the activation of a manual de-
frost cycle is confirmed by an audible signal.
Cooling turns back on automatically.
In addition to the programmed automatic defrost, a manual defrost for the
cryochamber can also be activated ( see item 6.2.6 ).
7. Daily Use of the Instrument