4
Thermo Scientific Forma 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
5
Thermo Scientific Forma Laboratory Refrigerators
Installation and Operation
6.2
Display Functions
Table 2.
Control Panel Display Functions (including optional alarm functions)
6.3
Alarm Setpoints
To enter programming mode, press Scan, hold for 5 seconds, and release. The first two values displayed are the warm and cold alarm
setpoints. Note that the alarm setpoints cannot be adjusted when the key switch is in the alarm position.
Table 3.
Alarm Setpoint Programming Functions (with Alarm Option Only)
6.4
Service Mode Parameters
When the key switch is not turned to third (alarm) position, you can access service parameters by entering programming mode and
pressing Scan for an additional 5 seconds. On release of the button, the display will go blank, then display “SEr” with the service
wrench icon illuminated. Then the firmware checksum (read-only) will be displayed for about 4 seconds. Pressing Scan repeatedly
scrolls through the available service functions. While you are in service mode, the wrench icon is illuminated. For any flashing
parameter you can use
and
to adjust the value
.
CAUTION!
Resetting any of the following parameter values could adversely affect the performance of your refrigerator.
These settings very rarely need to be changed for normal +4ºC operation. Be sure to call Service before making any
adjustments to parameter values.
Table 4.
Programming Parameters
Function
Meaning
Sequence
Display
Normal operation
Default display while refrigerator
is running
—
Temperature display, thermometer show cabinet temperature.
Cold excursion
Show coldest cabinet temperature
since last startup or reset
Press
Thermometer, display show cold excursion while button is
pressed.
Warm excursion
Show warmest cabinet temperature
since last startup or reset
Press
Thermometer, display show warm
excursion while button is
pressed.
Mute
Silence audible alarm
Press
Scan
Thermometer, display show cabinet temperature, alarm icon
continues to flash.
Reset
Return to default display after
excursion or alarm condition
Press
and
simultaneously, hold
for five seconds
Excursion values are reset; thermometer, display show cabinet
temperature. Display blinks to confirm reset.
Alarm test
Test by simulating warm and cold
alarm conditions; key switch must be
in alarm mode
Press
and
Scan
simultaneously, hold
for five seconds
Display and thermometer show simulated cabinet temperature,
alarms flash and sound as appropriate. Alarms clear when test is
completed.
Function
Programming Sequence
Adjust cold alarm setpoint
Enter programming mode by pressing
Scan
and holding for 5 seconds. On release, the current cold alarm
setpoint value flashes in the temperature display; use
and
to adjust it. The display automatically returns
to normal operating mode 30 seconds after the last key entry or after scrolling through all available functions
and parameters.
Adjust warm alarm setpoint
Enter programming mode and press
Scan
repeatedly. The current warm alarm setpoint value then flashes in
the temperature display; use
and
to adjust it. The display automatically returns
to normal operating
mode 30 seconds after the last key entry or after scrolling through all available functions and parameters.
Parameter
Display
Notes
1. Offset
Value
Center air temperature calibration. Default value is 0 (maximum + or -
2.9).
2. Cut On
Cut (2 sec.); On (2 sec.); then value
Cabinet temperature at which compressor starts to cool down to
setpoint. Default value is 6ºC.
3. Differential
dIF (2 sec.); then value
Cut on – differential = temperature at which compressor stops after
achieving cabinet temperature setpoint. Default value is 3.
4. Defrost Interval
dEF (2 sec.); Int (2 sec.); then value
Range 1 to 12 hours; default value is 01.
5. Defrost Duration
dEF (2 sec.); dur (2 sec.); then value
Range 5 to 30 minutes; default value is 15.
6. Defrost HIgh-tempTermination
dEF (2 sec.); HI (2 sec.); then value
Temperature at evaporator at which defrost cycle terminates; default
value is 4ºC.
7. Short Cycle Delay
SHO (2 sec.); Cyc (2 sec.); then value
Range 0 to 15 minutes; default value is 0.
8. Control Probe Temperature
Cnt (2 sec.); Prb (2 sec.); then value
Display only.
9. Network address
nEt (2 sec.); Adrt (2 sec.); then value
Can only be modified by RS-485 communications software.
10.Defrost Probe Temperature
dEF (2 sec.); Prb (2 sec.); then value
Display only.