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BACK-UP SYSTEM (OPTION)
With the back-up system (CVK-UB4), the freezer prevents the chamber temperature from going up by
injecting the liquid CO
2
gas when the power supply is disconnected (power failure, disconnection of power
cord, breaker OFF) or in the case of failure of freezer itself. The liquid CO
2
gas is injected with the
activation of solenoid valve energized by battery when the chamber temperature reaches the alarm
temperature.
Following shows the procedure for setting the back-up system.
1. Setting of liquid CO
2
gas cylinder
By using the joint and pipe enclosed with the
back-up system, connect the liquid CO
2
gas
cylinder to the joint of the back-up system. For
this setting, consult with a qualified gas supplier or
Sanyo sales agency.
2. After setting the liquid CO
2
gas cylinder, operate
the freezer until the chamber temperature reaches
the required level.
3. Set the temperature of back-up operation at the
temperature higher than -70
o
C. The back-up
system is operated continuously if the temperature
of back-up operation is set at the temperature
lower than -70
o
C. This means the liquid CO
2
gas
is consumed very quickly.
4. Switch on the back-up system.
5. Make sure that liquid CO
2
gas spouts into the freezer chamber by pressing the back-up test switch.
Note:
Ŷ The liquid CO
2
gas cylinder loses its cooling capacity at speed when the ambient temperature is over
31
o
C. Install the liquid CO
2
gas cylinder in the cool environment. And the duration of back-up time per
one liquid CO
2
gas cylinder varies depending on the ambient temperature. Refer to “Installation of
back-up system” enclosed with the back-up system for the available back-up time.
Ŷ The liquid CO
2
gas cylinder should be a siphon type.
Ŷ Use the pipe encloses with the back-up system for the setting. (The extension of the pipe is not
permitted because of cooling capacity.)
Rough scheme (back side)
Liquid CO
2
gas cylinder