Sanyo MDF-192 Instruction Manual page 22

OPERATING INSTRUCTIONS
Back-up system
WARNING
As with any equipment that uses CO
of the equipment. It is important that you assess the work site to endure there is suitable and
sufficient ventilation. If restricted ventilation is suspected, then other methods of ensuring a
safe environment must be considered. These may include atmosphere monitoring and warning
devices.
The freezer MDF-192AT is provided with an automatic liquid CO
system. This freezer prevents the chamber temperature from going up by injecting the liquid CO
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
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
By using the joint and pipe enclosed with the
freezer, connect the liquid CO
joint of the back-up system.
consult with a qualified gas supplier or Sanyo sales
agency.
2. After setting the liquid CO
the freezer until the chamber temperature reaches
the required level.
3. Set the warning indicator of the recorder at the
temperature higher than -70
system is operated continuously if the warning
indicator is set at the temperature lower than -70
This means the liquid CO
quickly.
4. Switch on the back-up system.
5. Make sure that liquid CO
Note:
• The liquid CO gas cylinder loses its cooling capacity at speed when the ambient temperature is over
2
o
31 C. Install the liquid CO
one liquid CO gas cylinder varies depending on the ambient temperature. Refer to "Installation of
2
back-up system" enclosed with the freezer for the available back-up time.
• The liquid CO gas cylinder should be a siphon type.
2
• Use the pipe encloses with the freezer for the setting. (The extension of the pipe is not permitted
because of cooling capacity.)
gas, there is a likelihood of oxygen depletion in the vicinity
2
gas cylinder
2
gas cylinder to the
2
For this setting,
gas cylinder, operate
2
o
C. The back-up
gas is consumed very
2
gas spouts into the freezer chamber by pressing the back-up test switch.
2
gas cylinder in the cool environment. And the duration of back-up time per
2
gas injection device as a back-up
2
gas is injected with the activation of solenoid valve
2
Rough scheme
o
C.
Battery
21
gas
2
Liquid CO
2
gas cylinder
Solenoid valve