Leica Biosystems CM1520 - Manual (Page 48)

48 Instructions for Use V1.3 – 10/2012
7.5 Defrosting
7. Daily Use of the Instrument
To avoid an unintended defrosting, the activation of a manual defrost 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 6.2.5 ).
During the automatic cryochamber defrosting, the quick freeze shelf is cooled further.
The maximum duration of a defrost cycle is 12 minutes. Defrosting is terminated auto-
matically 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 ensure a secure flow of condensate and to prevent a potential contamination risk, the
drain tube (on the side next to the instrument) must be inserted in a catch tank.
During defrosting, remove the plug from the cryochamber. Afterwards, reinsert it securely.
Defrosting the cryochamber actually means defrosting the evaporator to prevent excessive frost
buildup. The evaporator is flushed with hot gas during defrosting. The cryochamber is virtually
frostfree and does not need to be defrosted.
The condensation water that is produced during defrosting is collected in a container, which
is located next to the instrument.