5-11
Trouble & Possible Cause Symptom & Remedy
I.
“Snow,” dry ice crystals build up in room.
(Optional CO
2
system installed only.)
1.
Occurs only when operating below
-100ºF (-73.3ºC.) Some snow is always
present in the range -75ºF to -100ºF, but
it melts as rapidly as it forms and does
not accumulate sufficiently to affect
temperature control.
1a. Temperature controller is out of
calibration and the chamber temperature is
actually below -100°F (-73.3ºC.)
REMEDY: Calibrate controller.
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