Labconco FreeZone 76700 Series User Manual
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Contents
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Chapter 7: TroubleshootingProduct Service 816-333-8811 or 1-800-522-7658 334. Isolate the pump by disconnecting the vacuum hose from the Freeze Dryer.Deadhead the pump by inserting the vacuum sensor from a secondaryvacuum gauge into the end of the vacuum hose and observe the vacuumreading obtained. Confirm that the pump is capable of achieving anultimate vacuum less than 0.010 mBar or approximately 10 microns. If aninadequate vacuum reading is obtained, the pump has most likely failedand may need to be replaced or rebuilt.II. Gaskets, Tubing, Connections, Sample Valves1. Check all sample valves on the drying chamber/manifold and ensure allvalves are closed or in the vent position. Check to ensure all fittings aretight and sealed properly against the chamber. Inspect valves for cracks orcuts.2. Inspect gasket(s) for cracks or defects. Ensure the gasket is clean. Apply athin coat of vacuum grease to the gasket. Keep in mind too much vacuumgrease can actually cause leaks.3. Check the drain line and ensure the drain plug is installed and the tubeappears to be in good condition.4. Check all rubber vacuum tubing for signs of deterioration or cracking.5. Check all connections and make sure they are secure and leak tight.6. When checking the sample valves, pull as much vacuum as possible. If avacuum indication is displayed, wiggle or rotate the valves and watch thegauge for any fluctuations. Fluctuations can indicate a potential vacuumleak. If the valve seems to be in good condition, remove the valve andapply a thin coat of vacuum grease to the stem and the outside sealingsurface of the valve body, and reinstall the valve. DO NOT APPLYVACUUM GREASE TO THE SAMPLE VALVE GASKETS, WHICHSEAL TO THE WALL OF THE DRYING CHAMBER. If the valvestill seems to be the source of the problem, remove the valve and stopperthe hole with a rubber stopper. Continue checking the other valves.7. Make sure that the sample valve bulkhead nuts are tight. Either tighten byhand or use the wrench supplied with chambers. To use the wrench, firstremove the knob and stem assembly and also the valve body. The pins onthe wrench fit into the round holes of the nut. The nut should be snug butavoid over tightening. Replace the valve body and knob and stemassembly. |
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