Operating Manual Freeze Dryer ALPHA 1-2 LDplus Maintenance • 55
7. Maintenance
7.1. Ice Condenser Chamber
Before each start-up ensure that all water residue has been
removed from the ice condenser chamber. If necessary, wipe the
ice condenser chamber.
Before every drying process it is recommended to open and close
the drain valve once.
7.2. Heat Exchanger
A laminated heat exchanger is used to cool the refrigerant
compressed by the refrigerator. The heat exchanger is placed at
the back of the unit. In intervals of a few months it must be
checked for dust or dirt residues and cleaned if necessary.
Cleaning of the heat exchanger can be carried out best by
brushing, by using a vacuum cleaner from the outside or by using
compressed air from inside the unit.
Excessive dirt on the heat exchanger leads to a decrease in
performance and can lead to a failure of the unit!
Please note: The unit must not be turned upside down!
7.3. Adjustment and Maintenance of the Vacuum
Sensor VSP62
7.3.1. Maintenance of the Vacuum Sensor:
The tungsten wire has a limited service life because it easily reacts
with ambient gases. Tungsten reacts especially with carbons to
build tungsten carbide. The wire becomes short and breaks.
Therefore, the only possibility to enlarge the service life of PIRANI
sensors is to a v o i d
every contact to carbonic substances.
At the end of the drying process vent the freeze drying unit and
remove the dry product. Then defrost the unit with open drain
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