Operating Manual Freeze Dryer
ALPHA 1-4 LD-2 / 2-4 LD-2
, Version 0203, Page 22
2.7.3 Preparing for Evacuation
The drying chamber made from acrylic glass with ground-in stoppers is placed on the
ice condenser chamber.
The defrosting water valve at the left side of the unit and any rubber valves on the
drying chamber are closed.
The vacuum pump is connected to the unit and to the mains.
2.7.4 Evacuation
The drying chamber is evacuated by switching on the vacuum pump.
After switching on the pump it must not be possible to lift the acrylic chamber or lid
anymore.
2.8
Error messages
A possible error is showed in form of
“
ER : XX
”
(Error) in the lower part of the LC-
Display.
“
XX
”
is marking the error code. In case of a fault, the display changes in one
second intervals between error code and value display until the mains voltage is
switched on and of.
All errors can be removed through the following measures:
-
Switching on and of the mains voltage (mains switch; Power
–
On-Reset).
-
Over the communication interface by using the command
“
reseterr
”
Error number
Meaning, possible cause
ER10
Compressor 1 overpressure
Compressor turns off (until overpressure is
reducted)
ER 11
Compressor 2 overpressure
Compressor turns off (until overpressure is
reducted)
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