Labconco FreeZone Bulk Tray Dryer 78060 Series User Manual
Page 27
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Refer to the following if your Freeze Dry System fails to operate properly. If the
suggested corrective actions do not solve your problem, contact Labconco for
additional assistance.
FreeZone Freeze Dry Systems that are clean and dry and without samples
attached should reach a vacuum of 0.133 mBar within 30 minutes and should
achieve an ultimate vacuum of 0.033 mBar within 18 hours when the refrigeration
is operating. If the Freeze Dry System does not obtain a satisfactory vacuum,
perform the following maintenance tests.
I. Vacuum Pump
First make sure that the vacuum pump operates. If it fails to operate, check the
electrical connections of the Freeze Dry System to the power source and then
check the electrical connection of the vacuum pump to the Freeze Dry System. If
the vacuum pump has a power switch, make sure that it is turned on. If the
vacuum is not adequate when the vacuum pump is operating, proceed with the
following steps:
1. Check the oil and ensure it is clear and clean. If the oil looks cloudy or
has any particulates, replace the pump oil. Sometimes it may be necessary
to flush the pump with clean oil several times. To flush the pump, run the
pump 5 to 10 minutes to allow the oil to warm up. Drain the oil and refill
with clean oil. Repeat as necessary.
2. Check the oil level in the pump. Ensure it is filled to the correct level.
3. Check vacuum hose connections from the pump to the Freeze Dryer and
try running the unit. If vacuum problems continue, consider obtaining a
second vacuum gauge capable of reading a vacuum of 0.010 mBar. It is
often useful in determining if the vacuum pump is operating properly and
the vacuum sensor reading is accurate.