Humboldt H-3185B Rapid, Freeze Thaw Cabinet - Manual (Page 7)

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4.1 Changing Operational Modes
1) To change the mode of operation, press and hold the Mode button (see
figure 4A) for at least three seconds. The red display will read “Ctrl” and the
green display will read whatever mode it is currently in.
2) Use the up or down arrow buttons to change the setting on the green
display to show the mode desired.
3) When the desired mode is set, return to the temperature readings and begin
the operation by holding down the Mode button again until the displays
show the actual temperature and set value readings as in Figure 4.
4.1.1 Normal Mode
1) To change to Normal mode, follow step 1 in section 4.1 for changing the
operational mode.
2) When the red display reads “CtrL”, press one of the arrow buttons until the
green display reads “nor” (Figure 5).
3) Follow step 3 in section 4.1 to return to the temperature readings and begin
the operation.
Note: When in Normal mode operation, the controller will try to maintain the
temperature of the set value (green display). If it is desired to maintain the
test samples at a certain temperature, Normal mode should be used. If the
controller was on standby when power to the controller was disconnected and
later reconnected, the controller will automatically go into normal mode when it
receives power.