Freeze-dryer Gamma 1-16 LSCplus
Freeze-dryer Gamma 2-16 LSCplus
2 Layout and mode of operation
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Version 04/2013, Rev. 2.10 of 09/03/2020
• sb-dc
Translation of the original operating manual
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2.2.2.6
Defrosting
Defrosting with hot gas
As standard, the freeze-dryer is equipped with a hot-gas defrosting system.
In order to defrost the ice condenser, heated refrigerant is fed through the
heating coil. In addition, the bottom of the ice condenser chamber is heated
by way of a heating collar.
In order to avoid damage, the condensate must be drained off through the
media drain valve directly after the completion of the defrosting process.
Then, any residual water must be removed from the ice condenser
chamber by way of a cloth.
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Special equipment: defrosting with hot water
NOTE
For hot-water defrosting, the freeze-dryer must be connected to a hot
water supply.
The ice condenser is defrosted by feeding hot water into the ice condenser
chamber. The hot water is sprayed onto the ice condenser until the
maximum filling level is reached in the ice condenser chamber. Then, the
feed flow will be stopped automatically and the drain valve will be opened
until the liquid level in the ice condenser chamber falls below a certain
level. This process will be repeated at certain intervals until the preselected
defrosting time has elapsed.
In order to avoid damage, any residual water must be removed from the ice
condenser chamber directly after the completion of the defrosting process
by way of a cloth.
1
Defrosting ring
Fig. 10: Ice condenser chamber with a hot-water defrosting system
