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TRIAL OPERATION
Following is the procedures for the trial operation of the back-up system. Read an instruction manual
enclosed with a ultra-low temperature freezer carefully before the trial operation.
1. Check that the gas cylinder connect pipe is connected properly between the LCO
2
solenoid valve and
the gas cylinder. The connection should be done by qualified engineers or service personnel only.
2. Set the ultra-low temperature freezer at desired temperature and run the freezer until it reaches the set
temperature.
Note: CO
2
gas will be released automatically without pressing the test switch when turn on the
back-up system if the set temperature of the freezer is higher than that of the back-up
temperature.
3. Set the temperature setting knob to the temperature 10
o
C or more higher than the set temperature of
the freezer.
4. Turn on the back-up system with the freezer door closed. Check that the indicator on the door switch
ass’y is on.
5. Press the test switch to check that the CO
2
gas is released into the freezer chamber.
Stop the operation immediately and contact your dealer or sales representative if there is something
wrong with the back-up system during the trial operation and it is still existing after careful check of the
procedure.
WARNING
Check the gas piping before trial operation to avoid gas leakage.
Attach the back-up unit cover before starting the trial operation. The operation without the cover
may cause electric shock.
CAUTION
Stop the operation immediately and review the attachment procedure carefully if there is something
wrong with the back-up system during the trial operation.
Calibration
In the case that there is a difference between the chamber temperature and displayed temperature,
Adjust the displayed temperature by the method of the service technical manual.
