COOKING & BOILING UNIT (CBU)
A three-position switch (center being off) permits selection of two temperature settings, 70°C or 100°C (boiling). A green indicator light illuminates when power is supplied to the CBU and a white one illuminates when the heater element is heating.
As a precaution, in the event the main container boils dry, two redundant protective circuits ensure that power to the heating element is shut off. An additional feature cuts power to the CBU if the supply voltage drops below 23 VDC, protecting the vehicle's batteries from depletion in the event the CBU is inadvertently left on. The CBU returns automatically to normal operation when the voltage again rises above 25 VDC.
Another feature unique to Isotherm's CBU is the two-valve pressure relief system. By maintaining the pressure in the inner bucket slightly higher than in the main container, there is no danger of water in the bucket coming to a boil, even when the water surrounding it is boiling. Moreover, the two-valve system ensures the two containment vessels are pressure-sealed from each other, ensuring the physical segregation of their contents. The significance of this advantage can be appreciated when one considers that meal packet identification ink can be toxic, and should never be allowed to contaminate the potable water in the main container.
Overall Dimensions: (lid closed)
Width: 212 mm
Height: 250 mm
Depth: 265 mm
Weight (empty): 7.0 kg
Main Container: 4.2 litres
Removable Bucket: 3.0 litres
Nominal Voltage: 28 VDC
Permissible Voltage Range: 23 to 30 VDC
Current Draw (Operating): 28 amps
Current Draw (When Off): 5 ma (0.005 amps)
Temperature Set Points:
Position I: 68 to 72°C
Position II: 100°C