Martin Christ Alpha 2-4 LDplus - Manual (Page 30)

30 Installation and Commissioning of the Unit Operating Manual Freeze Dryer ALPHA 1-4 LDplus / ALPHA 2-4 LDplus
4.4. Checking the Earth Connection
For checking the earth connection there is a screw for equalising
the ground potential on the rear 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.