Labconco FreeZone Bulk Tray Dryer 78060 Series - Manual (Page 31)

Chapter 7: Troubleshooting
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1. Remove the stopper from the side of the chamber and place a flat gasket
and 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 reassemble and test.