Labconco FreeZone 1 Liter Benchtop Freeze Dry Systems 7740071 - Manual (Page 34)

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Chapter 6: Troubleshooting
Product Service: Domestic 1-800-522-7658, International 816-333-8811
The following test determines if a vacuum leak is in the collection
chamber.
1. Insert a rubber stopper in the small hole in the rear of the
collector chamber.
2. Start the Freeze Dryer and observe the vacuum indication.
If the vacuum is good, the problem is in the collection
chamber. If it is bad, the problem is in the plumbing
connections from the collection chamber to the vacuum
pump.
3. If the leak is in the chamber, check the drain hose, hose
connections and the drain plug.
4. If the leak is in the plumbing connections, check all rubber
parts, fittings and clamps.
Checking the connections to the pump and the vacuum tube
Stopper