Freeze-dryer Alpha 1-4 LDplus
Freeze-dryer Alpha 2-4 LDplus
8 Maintenance and service
Version 11/2006, Rev. 2.2 of 17/10/2016 • sb
Translation of the original operating manual
Cleaning of the freeze-dryer
• Switch the freeze-dryer off by actuating the mains power switch and
disconnect the power cord from the wall outlet before cleaning.
• If the freeze-dryer has been contaminated with toxic, radioactive, or
pathogenic substances, clean the inside immediately with a suitable
decontamination agent (depending on the type of contamination, see
chapter 8.2 - "Disinfection of the drying chamber and accessories").
• Remove product residues thoroughly with a cloth.
• Open the lid/drying chamber when the freeze-dryer is not in use so
moisture can evaporate.
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8.1.1.1 Ice condenser chamber
Before each start-up, ensure that the ice condenser chamber is free from
water residues.
• Open the media drain valve to drain off any liquid. Then, close the
valve.
• If necessary, wipe the ice condenser chamber dry with a cloth.
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8.1.1.2 Aeration valve, media drain valve
Contaminants such as product residues may lead to an insufficient vacuum.
In this case, the aeration valve and the media drain valve must be cleaned.
• Switch the freeze-dryer off and disconnect the mains plug.
• Remove the valve core.
• Clean the valve core and the opening with a moist cloth.
• Clean the O-rings and inspect them for any damage. Damaged O-rings
must be replaced.
1 Valve opening
2 Valve core
3 O-rings
Fig. 49: Valve opening and valve core with O-rings
(example, varies depending of the type of freeze-dryer)
• Reinsert the valve core.
• Put the freeze-dryer into operation again.
If the vacuum is still insufficient, the freeze-dryer must be checked by
qualified specialist personnel (see chapter 7.3 - "Service contact").
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