Technical data

The refrigeration unit is automatically switched off in these cases.
Once the permissible operating conditions are reached again (after
a few minutes), the refrigeration unit is switched on automatically
via the motor protection switch or via the pressure switch.
Important errors are indicated by the process and equipment
information system.
The minimum ice condenser temperature of approx. -55°C or -
85°C is reached when the ice condenser is not loaded and the ice
condenser chamber is evacuated.
Sufficient air circulation is very important. Do not place any objects
behind the unit!
6.7. Process and equipment information system
Process messages see chapter 5.6.1.
6.7.1. Error messages
Code 01
Vacuum of 6.11 mbar has not been reached within
15 minutes. Vacuum pump was switched off. Vacuum
leakage or pump defective.
This error occurs when the pressure in the ice condenser chamber
has not reached 6.11 mbar after 15 minutes of operation with open
pressure control valve. There must be a vacuum leak in the
system. The pump is switched off to avoid it pumping against the
atmospheric pressure. The cause may be a vacuum leak (aeration
valve or drain valve not closed, lid or drying chamber not mounted
in a vacuum-tight way, missing ground-in stopper in the lid or in
the drying chamber) or a defect of the vacuum pump (check
whether the mains switch of the vacuum pump is switched on).
The pressure control valve is closed and the vacuum pump is
switched off. Please eliminate the error and confirm the message
afterwards.
Code 02
Safety pressure has not been reached within 20
minutes.
This error occurs when the preset safety pressure is not reached
within 20 minutes after the start of the vacuum pump (with open
pressure control valve). Please check whether the value set for the
safety pressure is too low.
Code 03
See chapter 5.6.1.
76 • Troubleshooting Operating Manual Freeze Dryer ALPHA 1-4 LSC / ALPHA 2-4 LSC