Labconco Dry Ice Benchtop Freeze Dry System 7522700 - Manual (Page 4)

Instruction Sheet 7523200, Rev A C639 4 of 6
CAUTION:
Dry ice is extremely cold and can cause frostbite. Always wear insulated gloves or use
tongs when handling.
Notes:
Always vent the vacuum line before turning off the vacuum pump.
Make sure all vacuum lines are secured to prevent leaks.
Wear appropriate protective attire and eye protection.
Clean stainless steel condenser after use.
Do not work with damaged, scratched, or chipped glassware.
Troubleshooting:
If the Freeze Dry system does not obtain a satisfactory vacuum, refer to the user’s manual
that was supplied with the Freeze Dry system. Vacuum problems concerning the drying
chamber may be resolved by performing the following procedure.
1. Check all sample valves on the drying chamber to ensure all are closed or in the vent
position. Check to ensure all fittings are tight and sealed properly against the chamber.
Inspect valves for cracks or cuts.
2. Inspect the gasket under the chamber for cracks or defects. Ensure the gasket is clean.
Apply a thin coat of vacuum grease to the gasket. Keep in mind too much vacuum grease
can cause leaks.
3. When checking the sample valves, pull as much vacuum as possible. If a vacuum
indication is displayed, wiggle or rotate the valves and watch the gauge for any
fluctuations. Fluctuations can indicate a potential vacuum leak. If the valve seems to be in
good condition, remove the valve and apply a thin coat of vacuum grease to the stem and
the outside sealing surface of the valve body and reinstall the valve. Do not apply
vacuum grease to the sample valve gaskets, which seal to the wall of the Drying
Chamber. If the valve still seems to be the source of the problem, remove the valve and
stopper the hole with a rubber stopper. Continue checking other valves.
4. Make sure the sample valve bulkhead nuts are tight. Either tighten by hand or use the
wrench supplied with chamber. To use the wrench, first remove the knob and stem
assembly and also the valve body. The pins on the wrench fit into the round holes of the
nut. The nut should be snug, but avoid over-tightening. Replace the valve body, knob and
stem assembly.