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P a g e
OPERATION
H
IGH
T
EMPERATURE
L
IMIT
A
CTIVATED
The High Limit system blocks heating in the oven chamber if chamber temperature meets or exceeds
the present High Limit setting. Heating remains disabled until the High Limit cutoff is manually cleared
by the oven operator.
Indicators
The oven controller display screen flashes two alternating alert screens when a High
Limit cutoff is active. Activation of the cutoff is accompanied by a click sound.
Additionally, an illuminated “4” on the bottom-most display block indicates the oven
is routing electricity away from the heating elements.
High Limit Activation Conditions
•
The current temperature set point is above or near the High Limit cutoff
setting. The High Limit should be set to
at least 10°C above
the highest
intended temperature of your heating application.
•
A heat source in the oven chamber is pushing the oven temperature above
the limit setting.
•
Significant outgassing in the chamber may be interfering with the measured
temperature.
•
Attempting to heat a significant mass of product or samples may trigger a
temperature overshoot.
•
The main controller circuitry or sensor probe have failed.
If you suspect an ignition event in the oven chamber or hardware failure,
turn off the oven and
wait for the oven to cool to room temperature before opening chamber door.
Contact
for assistance.
Clearing the High Limit Heating Cutoff
•
Clearing the cutoff restores power to the oven heating elements.
•
The oven chamber temperature must be below the High Limit cutoff setting in order to
clear the cutoff.
•
Always verify it is safe to resume heating before clearing the High Limit cutoff.
1.
Push the Reset button.
•
The alert screens will flash 2 additional times before the oven controller ends the
cutoff.
Alternating Alert
Screens
Attention Screen
Heating Off
