Freeze-dryer Alpha 3-4 LSCbasic
8 Maintenance and service
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Version 11/2018, Rev. 1.9 of 01/12/2021
• sb
Translation of the original operating manuel
1
Valve opening
2
Valve core
3
O-rings
Fig. 61: 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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8.1.4
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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