Humboldt H-3185B Rapid, Freeze Thaw Cabinet - Manual (Page 6)

6
3.0 Set Value Control
The default mode for the controller is “Normal” mode. In this mode, the
controller will try to maintain the temperature controlled by the Set Value
(green display). When the controller receives power, it will automatically go to
this mode. The controller will continue to heat or cool to maintain the set value
temperature until it is manually stopped. To change the Set Value, press the
up or down arrow button (see figure 4A) and the value in the green display will
change. The speed that the value in the display changes is a function of the
length of time the button is held down. The longer the button is held down, the
faster the display value will change.
4.0 Operational Modes
There are four modes of operation with this controller. These modes are
as follows:
1) FOP – Fixed Output Percentage
The Freeze-Thaw machine does not use this function.
2) nor – Normal
This mode, as stated in section 3.0, is the normal mode in which the
controller will maintain the set value temperature.
3) stby – Standby
This mode puts the controller on standby. The heating and cooling
functions of the machine will be shut off.
4) r.s – Ramp/Soak Recipe
This mode is for running a controlled temperature cycle for a finite number
of cycles. This is the mode used for freeze-thaw testing.
Up arrow button
Down arrow button
Mode button
Menu button
Figure 4A - Button Guide