Labconco FreeZone 1 Liter Benchtop Freeze Dry Systems 7740071 - Manual (Page 21)

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Chapter 4: Using Your Freeze Dryer
Product Service: Domestic 1-800-522-7658, International 816-333-8811
4. Remove the accessory drying chamber or manifold from the
connection port and using a soft, lint-free cloth or paper towel,
wipe the port gasket and sealing surfaces of the drying
chamber/manifold to remove any dirt and contaminants that
could cause a vacuum leak. Reinstall the drying chamber or
manifold on the port. Vacuum grease is not required on the
port gasket to obtain a proper vacuum seal.
5. Check that each sample valve is closed or in the “vent”
position.
Vacuum Pump Ballast Setting
Most vacuum pumps are equipped with a gas ballast mechanism.
The freeze dry process requires high vacuum (0.133 mBar).
Therefore, it is recommended that the gas ballast be closed during
the operation of the Freeze Dry System. If the gas ballast is left
open for extended periods of operation, the oil can be pumped out
the exhaust, causing the pump to fail.
Operating the Freeze Dryer
Set-Up
The Freeze Dryer may be configured to automatically start the
vacuum pump when the collector temperature reaches –40°C. The
display units for vacuum may be selected to be mBar, Pascal (Pa)
or Torr and the temperature may be displayed as °F or °C. The run
time of the refrigeration system and the vacuum pump may be
monitored.
To configure your Freeze Dryer, turn the power switch ON and
press MENU. The display will show:
• Either MANUAL or AUTO will be flashing.
• Press SELECT until the desired function is flashing.
• Press MENU.
• The display will show:
VACUUM PUMP START UP
MANUAL AUTO