26 • Installation and Commissioning of the Unit Operating Manual Freeze Dryer ALPHA 1-2 LDplus
The following connections are required at the site:
4.2. Mains Electricity
The voltage given on the name plate must correspond to the local
supply voltage.
CHRIST freeze dryers are units of safety class I and include a
three-conductor connection cable and a shockproof plug.
4.3. Fuses on Site
The freeze dryer must be protected typically with a 16 AG fuse.
4.4. Checking the Earth Connection
For checking the earth connection there is a screw for equalising
the ground potential on the back panel of the freeze dryer. The
check can be carried out by means of an appropriate measuring
device.
4.5. Aeration
The aeration and drain valve at the lower left side of the unit is
used to vent the ice condenser chamber.
In case penicillin bottles have to be sealed under nitrogen instead
of vacuum, the ice condenser chamber can be flooded with
nitrogen via the nozzle of the aeration valve.
CAUTION! Max. 0.2 bar overpressure!
4.6. Condensate and Defrosting Water
The condensate and defrosting water is drained via the aeration
and drain valve on the lower left side of the unit. To drain the
water, connect the hose supplied with the unit to the nozzle. The
condensate and defrosting water are collected in a vessel.
The condensate and defrosting water can also be drained directly
via this hose. The condensate and defrosting water must be able
to drain freely. To achieve this, the hose must have a steady
downward slope. It must be ensured that water does not collect in
any part of the hose. The end of the hose always has to be above
the level of the liquid in the vessel for the discharged liquids.
Otherwise there is the risk of water and dirt residues being sucked
into the ice condenser chamber if there is a negative pressure
when opening the drain valve.
The drain valve is also used to vent the unit when a freeze drying
process has been completed.
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