C.B.S. Scientific DGGEK-2401 - Manual (Page 11)

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To change from °F to °C, place the Circuit Breaker/Power Switch in the OFF position and then
press and hold the P3 Button while turning the power back ON.
NOTE: When the temperature display units are changed, the Software High Limit value and all
temperature presets revert to the factory-default values. If a calibration value has been entered,
the value will be retained.
2 3 4 e Setting the Software High Limit - NOTE: DGGEK is factory set to 75ºC
This feature provides additional safety and protection by allowing a selectable upper tem-
perature limit set point. To avoid an unwanted shutdown during regular operation, the high
limit value should be set at least 5°C higher than the selected control temperature To set the
Software High Limit temperature set point, press the P2 and P3 keys simultaneously and repeat
until (Hxxx) appears on the display. This is the current Software High Limit value. It is factory set
at 75°C. To change the displayed value, press and turn the Select/Set Knob until the desired
Software High Limit set point value is displayed. A clockwise rotation increases the value; a
counterclockwise rotation decreases the value. Press the Select/Set Knob a second time to
accept the new value and return to normal operation. If the Software High Limit value meets or
exceeds the control temperature set point, (E-H1) will flash on the display. If this occurs, enter
a higher value for the Software High Limit or reduce the control temperature set point. If the
actual bath temperature reaches the Software High Limit setpoint, (FLt1) will flash on the dis-
play. Should this occur, the Controller will automatically remove power from the heater and, in
Refrigerating/Heating units, the compressor as well. The pump will continue to operate. Once
the problem is corrected (bath temperature reduced or Software High Limit value increased),
press the Power button to clear the message.
2 3 4 f Setting the Set Point Temperature
Press and release the Select/Set Knob. The decimal point flashes to indicate that the set point
temperature can be changed. Turn the Select/Set Knob until the desired temperature set point
is displayed. A clockwise rotation increases the setting; a counterclockwise rotation decreases
the setting. Press the Select/Set Knob a second time to accept the displayed value. The deci-
mal point stops flashing and the display will indicate the actual bath temperature. Allow suf-
ficient time for the bath to stabilize at the desired temperature before making any adjustments
to set point temperature. NOTE: The unit will automatically accept the displayed set point after
approximately 10 seconds of inactivity, even if the Select/Set Knob was not pressed. The set
point temperature may be checked at any time by pressing the Select/Set Knob. If the set
point temperature cannot be raised, it is possible that the Software High Limit value is set lower
than the desired control temperature set point. Reset the Software High Limit value to 5°C or
more above the desired set point temperature.
2.3.4.g User-Definied Preset Temperatures
With the unit on, press the desired Preset Button —
P1, P2, or P3. The LED associated with the selected
Preset Button will begin to flash. Rotate the Select/
Set Knob to the desired temperature set point. Press
the selected Preset Button a second time to enter the
new set point. The new set point temperature will not
be saved unless the Preset Button is pressed. The
LED associated with Preset Button lights continu-
ously whenever that preset value is controlling bath
temperature. If more than one Preset Button is set
at a given temperature set point, the LED associated
with all Preset Buttons with that set point will light.