Thermo Scientific 7450, Operating And Maintenance Manual

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The user may override a running freezing profile by manually injecting
LN
2
or operating the heater to more rapidly change the chamber
temperature.
1. During a running profile, press the Enter key to access Manual
Override Mode. If Access Code protection has been enabled, the unit
will prompt for the access code before entering Manual Override
Mode.
2. Select the desired function to override (Heat, Cool or Cool+) by
pressing the Enter and Back keys.
Heat controls the heater.
Cool energizes the solenoid.
Cool+ energizes both solenoids.
3. Press and hold the up arrow key to turn On the selected function, or
press and hold the down arrow key to turn it Off. The function will
revert to normal profile control when the key is released.
Note The function not under manual control will still be under profile
control. For example, if the Cool function is activated under manual
override and the chamber drops below the programmed setpoint, the
controller will activate the Heat function to compensate.
▲
To program user specific profiles, enter Edit Mode. The following describes
the actions and options necessary for adding or editing a profile.
Note If Access Code protection has been enabled, the unit will prompt for
the code before entering Edit Mode. To enable an access code, see Access
Code Security in this section.
▲
If the profile list is not displayed, press the Back key as many times as is
necessary to view them.
1. Locate the arrow to the left of the option that is on the top line of the
display. Move the profile (USER 1 through USER 10) that you wish to
view or edit to the top line by pressing the 5or 6 keys.
Note Pre-set Profiles may not be edited. ▲
2. To enter View Mode, press the Enter key.
7007452 CryoMed Freezer 2-7 Thermo Scientific
Section 2
Set-Up and Operation
Manual Override
Program User
Specific Profiles