Labconco FreeZone Bulk Tray Dryer 78060 Series - Manual (Page 28)

Chapter 7: Troubleshooting
Product Service 1-800-522-7658 24
4. Isolate the pump by disconnecting the vacuum hose from the Freeze Dry
System. Deadhead the pump by inserting the vacuum sensor from a
secondary vacuum gauge into the end of the vacuum hose and observe the
vacuum reading obtained. Confirm that the pump is capable of achieving
an ultimate vacuum less than 0.010 mBar or approximately 10 microns. If
an inadequate vacuum reading is obtained, the pump has most likely failed
and may need to be replaced or rebuilt.
II. Gaskets, Tubing, Connections, Sample Valves
1. Check all sample valves on the optional 6 port manifold shelf (if it is
installed) and ensure all valves are closed or in the vent position.
2. Check the drain line on the Freeze Dry System and ensure the drain plug is
installed and the tube appears to be in good condition.
3. Check all rubber vacuum tubing for signs of deterioration or cracking.
4. Check all connections and make sure they are secure and leak tight.
5. Check the Freeze Dry System collector lid gasket and the Bulk Tray Dryer
door gasket for indentations, cracks or tears. Clean gaskets using a soft,
lint free cloth or paper towel.
6. The Bulk Tray Dryer chamber and base unit collector chamber must be
dry.
7. When checking the sample valves, (if the system is so equipped), 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. 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 the
other valves.