Martin Christ Alpha 1-2 LDplus - Manual (Page 53)

Freeze-dryer Alpha 1-2 LDplus
7 Malfunctions and error correction
Version 11/2006, Rev. 2.0 of 02/12/2014 • sb
53
Translation of the original operating manual
7.1.3 Insufficient ice condenser temperature
CAUTION
Ensure sufficient ventilation. Do not place any paper, cloth, or similar
material behind or under the unit, since otherwise the air circulation will be
impaired.
The refrigeration unit is equipped with a protective device against
overpressure in the refrigeration system and with a thermal motor
protection switch.
The protective devices trip
• when the ambient temperature is too high
• when the air circulation of the heat exchanger of the refrigeration
system is insufficient
• when the refrigeration system is overloaded.
In these cases, the refrigeration unit will be switched off automatically. If the
permissible operating conditions are re-established after a cool-down
phase of several minutes, the refrigeration unit will be switched on again
automatically.
The malfunctions are displayed in the process and equipment information
window.
The minimum ice condenser temperature of approx. -55°C or approx. –
85°C (depending on the type of freeze-dryer) is reached when the ice
condenser is not loaded and the ice condenser chamber is evacuated.
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