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Section 2
Operation
Defrosting
Figure 2-3. Inside Drain
2-4
Blast Freezer
Proper defrosting is a critical factor in the proper operation of the freezer.
Defrosting times will be determined by ambient conditions, door opening
frequency, usage and load.
If the freezer is to be used for continuous 'blasting', it must be defrosted at
the end of each 8 hour shift, or more frequently if frequent door openings,
ambient conditions, or heavy product load create the need.
1. To begin the defrost process, first remove all product to a storage
location.
2. Turn Power switch to Defrost. The Defrost light stays on (amber).
3. Allow the door to remain open at least 90°. Just opening the door a
small amount makes defrosting a lengthy process.
4. The time needed for the defrost process is dependent on the amount of
frost/ice and the ambient temperature.
5. After all frost has melted, wipe the cabinet dry. A general purpose
disinfectant can be used, if desired. Follow directions on disinfectant
for rinsing requirements. The drawers can be removed for cleaning
purposes, if desired.
6. The drain tube can also be flushed with a disinfectant. The inside drain
is shown in Figure 2-3. A hose can be attached to the drain outlet
(Figure 2-4) on the back of the unit. Route to a drain or bucket large
enough to catch all liquid.
Figure 2-4. Drain Outlet
Thermo Scientific
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