OPERATION & MAINTENANCE MANUAL
CompactFreezer
27
and this will become thicker and colder with time. The center of the product will freeze last, and there
will be an appreciable difference in the temperature of the outer shell and the center of the product.
If a product is to be frozen to X° at the core, it is evident that the product need not reach X° at the core
in the freezer. There will be a point that can be determined by trial, at which the frozen outside shell
will be thick enough and cold enough to absorb the remaining heat in the core wo the entire mass
equilibrates to the required X°.
When the frozen product is quickly packed together after discharge from the freezer, there is little loss
of the refrigeration in the frozen shell. Equilibration occurs in the package where the refrigeration of all
pieces compliments each other.
7.6.
SHUTDOWN
At the end of a production shift, the freezer should be shut down in the following sequence:
1.
Stop loading food products.
2.
Wait until all food products have exited the
Cabinet Freezer
3.
Turn
OFF
the Instrument power.
4.
To defrost, run all fans and the conveyor for a while until the doors open easily.
5.
Turn
OFF
the Circulating Fan.
6.
Turn
OFF
the Conveyor drive.
7.
After about 5 minutes
–
turn
OFF
exhaust blower
8.
Main power switch should remain
ON
to keep panel and motors warm
9.
For extended shutdown:
Close the manual shut‐off valve (main valve) of the LN
2
‐supply at
the
freezer or at the storage tank. For shift shutdowns, it is not necessary to close the liquid valves at
the tank or above the module apparatus boxes. The valve at the tank only needs to be turned off
when working on the in feed lines.
