VWR VWRC0386A, Instruction Manual

Page: 49 / 94

Caution Make sure the pressure relief valve on any LN
2
tank is adjusted to
30 PSI maximum blow-off.
s
Warning
Carbon dioxide gas suppresses oxygen levels and may cause
suffocation if area is not well ventilated. Refer to “Handling Liquid CO
2
in Appendix B of this manual.
s
Power - indicates the unit has AC power.
1. Normal Operation
• Low Battery: Illuminates only after a battery test which occurs every 8
hours. The battery test is a loaded test and during the test, the battery
voltage is monitored. When the battery voltage is less than a certain
threshold, this light will illuminate and stay illuminated until the next
battery test.
• Solenoid Engaged: Illuminates any time the controller is activating the
solenoid. Illumination will only occur when the controller senses the
solenoid is active and calling for injection.
2. Fault Code
This same user interface will also permit fault codes to be easily viewed
when the user presses and releases the Press to Test button in less than
2 seconds. When this occurs, both the Low Battery LED and Solenoid
Engaged LED will blink twice ON/OFF quickly indicating that fault
code display mode is active. For the next ~10 seconds, the fault codes
will be displayed as shown in the table below. The display shows only
the lower number fault code until that fault is resolved.
Chest Freezer 7-5 VWR International
Section 7
Factory Installed Options
BUS Control Panel
(cont)
Low Battery LED Solenoid Engaged LED
Fault Code
Number
Fault Code Definition
OFF OFF 0 Normal Operation
OFF Blinks 1 time 1
Primary Probe Failure
OFF Blinks 2 times
2 Secondary Probe Failure
OFF
Blinks 3 times 3 Solenoid Driver Failure
OFF Blinks 4 times 4 Low Tank
Figure 7-6. BUS Control Panel
Table 7-1. BUS Fault Codes