Operation Polycold Cryochiller
Operating the Polycold Cryochiller with a Cryobaffle Installation and Operation Manual
Brooks Automation
6-12
214072 Revision B
Defrost the Cryobaffle
NOTE: If the cryobaffle captures too much water, the cryobaffle's apparent surface temperature
will rise and limit the ultimate attainable base pressure. Regular defrosting is recom-
mended to "regenerate" the cryobaffle. Complete defrosting can take 8 hours or more
depending upon the amount of moisture captured, the mass of the cold surface, and the
vacuum level.
1. When ready to defrost, switch the high vacuum pump to OFF.
2. Switch the refrigeration unit OFF or switch it to Standby.
3. When the cryobaffle is free of moisture, return the system to Cool mode as described at the begin-
ning of this procedure.
NOTICE
Do not select Defrost if the cryobaffle is not isolated from the oil diffusion or tur-
bomolecular pump. The Defrost cycle may release the captured moisture too
quickly and damage the equipment.
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