4
Thermo Scientific Revco Laboratory Refrigerators Installation and Operation
6 Control Panel
Figure 3. Refrigerator Control Panel
6.1 Control Panel Features
The control panel is located on the top right side of your
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
sensor inside the cabinet. You can use the buttons to display
other values such as setpoints and extreme values. 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). (This feature is not available for 45 ft
3
sliding glass
door models.)
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.
Key Switch
1
3
4 5
6
7
8
2
10
9
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