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2. Defrost: This button is used to manually defrost the unit
as well as to go back from the parameter settings.During
defrost, controller will show "def" on the display.
3. SC: This button is used for selecting an option in
parameters.
4. Up: Scrolls the menu items and increases the values.
5. Down: Scrolls the menu items and decreases the values.
6. Power Fail LED: This LED indicates the power failure in
the unit.The flash light indicate power failure .
7. Key Switch: Used to turn on or off the power to the
controller and power failure alarm.
Note: This is not a primary disconnect device, remove
the power cord to completely turn off the unit.
8. Off: Turns off the power of the controller.
9. Power On: Turns On power to the controller and is used
to silence the power failure alarm.
10. All Alarm ON: Turns On the audible power fail alarm.
Temperature Set point
The factory default temperature set point is -23°C for all
Laboratory Freezers. Adjusting the set point is not
recommended. In case the set point has to be changed,
follow the instructions given below.
The following display shows the current temperature.
Press Up / Down button to increase / decrease setpoint
temperature.
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Operation
After 30 seconds, the display automatically reverts to the
current temperature.
Alarms
The alarm system is designed to provide visual and audible
warning signals for both power failure and rise in temperature.
The alarm is equipped with a battery backup.
The power failure alarm system is activated only when the key
switch is turned to the Power Failure Alarm ON position.
WARNING: Low temperature, high temperature
and door ajar alarms are set to ON position by
default as soon as the controller is turned on.
These cannot be turned off.
Default low and high alarm values are -19°C and -27°C.
These values may be adjusted, following instructions in
section Temperature Set Point.
The audible warning signal sounds when there is a power
failure, temperature alarm condition, or when the door is ajar
for more than 1 minute.
Alarm display codes for high temperature, low temperature,
sensor failure and door ajar are mentioned in Table 6.
General Purpose Freezers
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