Labconco FreeZone 6 Liter Benchtop Freeze Dry Systems 77520 Series - Manual (Page 44)

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Chapter 7: Troubleshooting
Product Service: Domestic 1-800-522-7658, International 816-333-8811
The following test is used to check the collection chamber
integrity. The figure below points out potential areas to locate a
leak:
1. Remove the stopper from the side of the chamber and place
a freeze dry flask over the connection port.
2. Fill the collection chamber with approximately 2 inches of
water, enough to cover all fittings. Replace the collection
chamber lid and turn on the vacuum pump. Allow the
vacuum pump to run for approximately 5 to 10 seconds. (If
the vacuum pump is left on, the water will begin to boil and
the test will not be effective.) Look inside the chamber for
any bubbling while the pump is running and after you shut
the pump off.
3. If bubbling is observed around the bulkhead fittings, access
the bottom of the chamber and remove the insulation.
Tighten the appropriate fitting by placing a wrench on the
fitting inside the chamber and use a second wrench to turn
the nut on the bottom of the chamber. Be careful not to
damage the evaporator coils or the brazed joints to the
refrigeration system. Once the fitting is tightened, perform
the test again. Should the bubbling still be present, loosen
the bulkhead fittings and apply vacuum grease to the O-
rings, then reassembly and test.