User Manual

Delta 1-24 LSC&
Delta 2-24 LSC&
8 Maintenance and service
Version 04/2013, Rev. 1.2 of 20/02/2014 • sb
85
Translation of the original operating manual
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8.1.1.3 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. 72: 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 7.1.2.2 - "Aeration valve, media
drain valve").
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8.1.1.4 Heat exchanger (only for air-cooled freeze-dryers)
A lamellar heat exchanger is used for cooling the refrigerant that is
compressed by the refrigeration unit. This air-cooled heat exchanger is
located at the back of the unit (see chapter 2.1.1 - "Functional and
operating elements").
Dust and dirt impair the cooling effect of the air flow. Dust on the lamellas
prevents the exchange of heat and, thereby, impairs the performance and
power of the refrigeration unit. Strong soiling may cause the unit to fail.
This is why the selected set-up location should be as clean as possible.
• Check the heat exchanger at least once per month for soiling and clean
it if necessary.
• Please contact the Christ service department if you have any queries
(see chapter 7.3 - "Service contact").
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