Martin Christ Alpha 2-4 LDplus - Manual (Page 57)

Operating Manual Freeze Dryer ALPHA 1-4 LDplus / ALPHA 2-4 LDplus Maintenance and Service 57
7. Maintenance and Service
7.1. Maintenance
7.1.1. 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.
7.1.2. 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!
7.1.3. Vacuum Sensor VSP62/63
Please refer to the separate operating manual of the vacuum
sensor VSP62/63!
The VSP62/63 vacuum sensor is equipped with an internal Pirani
sensor, which utilises the thermal conductivity of gases. The
tungsten wire reacts with the components of the ambient gas, which
is why it only has a limited service life. Carbon-containing
substances, such as alcohol compounds in particular, extremely
reduce the service life.
The vacuum sensor is maintenance-free.
Remove any soiling on the outside with a cloth.