56
OPTIONAL COMPONENTS
Back-up cooling kit
By installing an optional backup cooling kit MDF-UB7 and a liquid CO
2
cylinder, liquid CO
2
injection into
the chamber prevent to rise the chamber temperature for a few hours, even when this unit stops
operation by a power failure and so on.
Contact our sales representative or agent for the purchase of backup cooling kit.
WARNING
As with any equipment that uses CO
2
gas, there is a likelihood of oxygen depletion in the vicinity
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 injection set temperature of the backup cooling kit can be set by the temperature setting knob [page
12]. Since the control method of injection is ON/OFF type, the actual injection temperature deviates from
the injection set temperature.
Note:
• Set the injection set temperature of the backup cooling kit to 10
o
C higher than the set temperature.
Otherwise, continuous injection of liquid CO
2
may reduce the retention time of liquid CO
2
cylinder.
• When the injection set temperature of the backup cooling kit is -70
o
C;
ON: -67
o
C~-65
o
C, OFF: -75
o
C~-74
o
C.
The behavior of the backup cooling kit
Backup
power switch
[Page 12]
Backup
display
[Page 13]
Condition of the
backup cooling kit
Chamber temperature
Liquid CO
2
ON
Switch ON
Ready to inject
Less than the injection set
temperature of the backup
cooling kit.
Does not inject
The injection set temperature
of the backup cooling kit or
higher.
Injects
OFF Switch
OFF
Not ready to inject
(Not ready to activate
the backup test switch)
Less than the injection set
temperature of the backup
cooling kit.
Does not inject
The injection set temperature
of the backup cooling kit or
higher.
• Duration of backup cooling
:
MDF-DU502VXC
:
Approx. 10 hours, MDF-DU702VXC
:
Approx. 9 hours,
(ambient temp.; 30
o
C, set temp.; -70
o
C, no load, liquid CO
2
gas cylinder of 30 kg)
