vwr.com I Instruction manual VWR
®
ULT Freezer 352/528 Eco Premium 02/2022
Page 38/86
If the function “Language selection at restart” has been activated (chap. 13.5, factory setting ON), the fol-
lowing settings are checked upon start up:
•
Menu language
(chap. 13.1):
Use the
arrow buttons
to select the desired language, confirm with the
OK button
•
Temperature unit
(chap. 13.2):
Use the
arrow buttons
to select the desired temperature unit, confirm with the
OK button.
•
Current date
(chap. 13.3), format DD MM YYYY:
Use the
arrow buttons
to set the day, continue with the
OK button
.
Use the
arrow buttons
to set the month, continue with the
OK button
.
Use the
arrow buttons
to set the year, confirm with the
OK button
•
Current time
(chap. 13.4), format HH:MM:
Use the
arrow buttons
to set the hours, continue with the
OK button
.
Use the
arrow buttons
to set the minutes, confirm with the
OK button
Set the controller to the desired temperature set point (chap. 8) used to operate the freezer.
As long as there is a difference between the actual and set value shown in the display, the
intended operation of the chamber will not be ensured.
8. Temperature set-point entry
Required access level: “User”.
Setting and control range:
-50 ºC /
-58 °F
up to -86 °C /
-122.8
°F
To set a lower setpoint value for test purposes or for adjustment, you can enter and activate a service
setpoint (chap. 19). This setting is outside the control range and is not intended for normal operation.
Path:
Normal display Setpoints Temperature
Press the
OK button
to enable the setting.
Temperature setting.
The current setting flashes. Enter the desired set-point with the
ar-
row buttons
.
Confirm the entry with the
OK button
.
Temperature
With the
Back button
you can go back to the “
Setpoints
” submenu and, repeatedly pressing it, to
Normal
display
.
With safety controller mode “Limit”, adapt the safety controller always when you changed the
temperature set-point. Set the safety controller value by approx. 15 °C above the temperature
set-point (chap. 12).
Recommended setting: safety controller mode “Offset” with safety controller value 15 °C.
Only insert samples into the freezer when it has reached its stable operating state.
Temperature equilibrating time to -80 °C /
-112 °F
is approx. 6 hours (VWR
®
ULT Freezer 352) / approx.
7.5 hours (VWR
®
ULT Freezer 528).