Technical data

7. Maintenance
7.1. Ice condenser chamber
Before each start-up, ensure that all water residues have been
removed from the ice condenser chamber. If necessary, wipe the
ice condenser chamber dry.
Before every drying process it is recommended to open and close
the drain valve.
7.2. Heat exchanger
A laminated heat exchanger is used to cool the refrigerant
compressed by the refrigeration unit. The heat exchanger is
located at the back of the unit and should be checked for dust or
dirt residues every few months. It must be cleaned whenever
necessary. The heat exchanger can be cleaned best by brushing,
by using a vacuum cleaner from the outside or by using
compressed air from inside of the unit.
Excessive soiling of the heat exchanger leads to a decrease in
performance and may cause a failure of the unit!
Please note: The unit must not be turned upside down!
7.3. Calibration and maintenance of the vacuum
sensor VSP62
7.3.1. Maintenance of the vacuum sensor:
The service life of the tungsten wire is limited due to the chemical
reaction with the components of the surrounding gas. Tungsten
reacts with carbon and forms tungsten carbide. As a result, the
wire gets brittle and breaks. The service life of PIRANI measuring
tubes can only be increased if they do
not get into contact with
carbon-containing substances.
Operating Manual Freeze Dryer ALPHA 1-4 LSC / ALPHA 2-4 LSC Maintenance • 81