4
Installation and Operation
Blood Bank Refrigerators
6
Control Panel
6.1
Control Panel Features
The control panel is located on the top right side of your blood bank refrigerator. You can use the three pushbuttons (#5, #8, and #9 in
Figure 3) to change the temperature display (#1) or to adjust temperature and alarm setpoints. The thermometer display (#2) provides a
quick visual indicator of current cabinet temperature and alarm conditions.
Before starting up your refrigerator, take some time to review the control panel functions:
1. Main temperature display — during normal operation, shows cabinet temperature in degrees Celsius, as measured by the upper
sensor inside the cabinet. You can use the buttons to display other values such as setpoints, extreme values, and lower sensor
temperature. The number in the main display flashes when you are changing a value.
2. Thermometer — shows cabinet temperature and alarm conditions. There are 10 horizontal bars: 9 are displayed during normal
operation, the tenth (top) bar indicates a warm alarm condition. The number of bars illuminated indicates approximate cabinet
temperature. Depending on alarm settings, 4 or 5 bars illuminated indicate that the cabinet is at setpoint. For example, suppose that
the cabinet temperature setpoint is +4ºC and that the warm and cold alarm setpoints are 8ºC and 0ºC. Then the number of bars
illuminated indicates cabinet temperature as follows:
bulb only 0ºC (cold alarm)
6 bars
4.8
1 bar
0.8
7 bars
5.6
2 bars
1.6
8 bars
6.4
3 bars
2.4
9 bars
7.2
4 bars
3.2
10 bars
8 (warm alarm)
5 bars
4 (setpoint)
When cabinet temperature exceeds the warm alarm setpoint, the top bar of the thermometer flashes. When temperature is lower than
the cold alarm setpoint, the bulb flashes. When you are in programming mode (described in Table 2) the thermometer shows the
setpoint value you are changing.
3. Power failure — illuminated when the main power supply is interrupted. In this case the audible alarm also sounds.
4. Service required —illuminated when the controller is in service programming mode or when simulated warm or cold alarm
conditions are failing to occur during an alarm test.
5. Increase — pushbutton used to increase setpoint values in programming mode and for various display functions.
6. Door ajar — illuminated when the refrigerator door is open and the alarm is activated (key switch turned to the alarm position).
7. Battery low — illuminated when the backup battery is low.
8. Decrease — pushbutton used to decrease setpoint values in programming mode and for various display functions.
9. Scan — pushbutton used to change the main display and for various other functions.
10. Audible alarm — illuminates during warm and cold alarm conditions.
For full descriptions of display, programming, and service functions, refer to Tables 2, 3, and 4 on page 5.
2
3
10
6
7
8
4
5
1
9
Key Switch
