MVE Biological Systems
TEC 3000 Operating and Maintenance Freezer Manual
13289499 Rev H •
124
Complete Freezer Thaw and Moisture Removal
1. Remove freezer LN2 supply.
2. Unplug TEC 3000 main power and battery backup if equipped.
3. Open or remove lid from freezer.
4. Allow LN2 to completely evaporate and the freezer space to warm to room temperature.
Placing a fan blowing into the freezer will accelerate this process.
5. After it has reached ambient temperature, thoroughly remove any moisture from the freezer
space. This can be done with a wet/dry vacuum and towels. For High Efficiency models, open
the hinged hatch on the bottom of the turn-tray to access the bottom of the freezer.
6. Once moisture has been removed from the freezer space, purge the plumbing assembly and
annular lines with nitrogen gas. Compressed nitrogen or the gas use valve on a LN2 cylinder
work best. The LN2 cylinder vent valve can also work, but will deplete the cylinder head
pressure quickly. Ensure the nitrogen gas pressure does not exceed 50 PSI (3.4 bar).
7. Plug in the TEC 3000 main power and connect the freezer plumbing via transfer hose to a
compressed nitrogen supply or the gas use valve on a LN2 cylinder. Ensure gas bypass is
disabled if equipped.
8.
Press “Start Fill” and allow the freezer to fill for 30 seconds.
9.
Press “Stop Fill”
10.
Press “Start Fill” and allow the freezer to fill for 30 seconds.
11. Continue cycling fills for 30 seconds until the plumbing assembly and annular lines are clear
and completely dry.
In some cases, it may be necessary to purge the level sensing annular line separately. This can be
done by connecting pressurized nitrogen gas directly to the freezer annular line fitting.
CAUTION
: Ensure that the LN2 supply valve is closed and the plumbing
assembly is vented before loosening the compression fittings and removing the annular
line tube.
1. Loosen and remove the 1/4 inch compression fittings from the purge valve and the freezer
annular line fitting.
2. Remove 1/4 inch copper tube and purge to clear any moisture.
3.
Connect nitrogen gas source directly to the freezer’s 3/8 inch FPT annular line connection.
4. Purge annular line with nitrogen gas, maintaining a pressure below 50 PSI (3.4 bar), until the
line in clear and completely free of any moisture.
NOTE: If moisture is not completely removed for the freezer space and annular lines,
ice will form when LN2 is reintroduced into the freezer. Ice blockage in the freezer space or
annular lines will interfere with proper function of the freezer and level sensing system.
ENSURE ALL MOISTURE IS COMPLETELY REMOVED PRIOR TO INTRODUCING LN2
Содержание MVE 1842P-150
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