Shellab SMO5HP-2 - Manual (Page 19)

19 | P a g e
OPERATION (CONTINUED)
C
LOSED
V
ENTS
The oven can be run with the exhaust vent closed if required for your application or process.
However, running the oven with a closed exhaust will likely decrease drying efficiency in the
chamber.
O
VER
T
EMPERATURE
L
IMIT
A
CTIVE
When the oven chamber air temperature exceeds the user-programed Over Temperature
Limit, the OTL system will depower the heating elements. This is normally accompanied by a
loud “click.” The display will flash two (2) alternating alert screens. “FAiL” in red, “L.st1” in
green. Then “Li.h1” in red, and “Attn” for attention in green. A small “4” will show in the bottom
display, indicating that the controller has depowered the heating elements.
The Over Temperature Limit will activate if one of two events happens.
 You have set the Over Temperature Limit below the temperature set point you are
using for your application or process.
 The main controller circuitry or sensor probe has failed, and must be replaced in
order to maintain safe and accurate oven operations.
If you have set the Over Temperature Limit too low, perform the following steps to take the unit
out of shutdown:
1. Press the advance key until I gnore “i9nr” shows in the top display, and Limit High
“Lih1” in the green display.
2. Press the green advance key again. Limit High Set Point “LhS1” will now show in the
green display, and the Over Temperature Limit setting in the red top display.
3. Adjust the Over Temperature Limit to above your set point using the Up Arrow Button.
4. Push the Reset Button to save the new OTL setting.
If the Over Temperature Limit has activated and the red oven temperature is higher than
your green temperature set point, the main controller circuitry or temperature sensor may have
failed. Cease using the oven and
contact Sheldon Technical Support for assistance.
Alternating OTL Alert
Screens