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DISPLAY INFORMATION
When operating the oven, there are three levels of access:
1. Store Level - General employees would know these functions and how to change them. While the
oven is running, enter this mode by holding the DOWN and UP arrows (
) simultaneously for
four seconds. The TIME display goes blank and the TEMP setpoint is displayed. Adjust with the
DOWN or UP arrows. The ENTER button (
) toggles between TIME and TEMP. The parameter
that can be adjusted is displayed, the other is blank. When TIME and TEMP are adjusted as
needed, wait five seconds and SAVE is displayed. The values are accepted and the controller
begins controlling to these new values. The conveyor continues to operate at the same speed
until a new value is accepted. The temperature control output should be OFF during changes.
2. Manager Level - This is a lock so that TIME and TEMP cannot be changed even at
the Store Level. While the oven is running, enter this mode by holding the DOWN and
UP arrows simultaneously for 4 seconds. The TIME display goes blank and the TEMP
setpoint is displayed. Release the UP arrow and continue to hold the DOWN arrow for
an additional 4 seconds. The TEMP display shows LOC as the TIME display shows
nO, which indicates that the TIME/TEMP parameters can be changed after reaching the
STORE level. yES indicates that the parameters cannot be changed even after entering
the STORE level. The LOC setting can be toggled using the ENTER button ( ).
ADDITIONAL FUNCTIONS
The conveyor belt direction and the temperature display can be changed on the conveyor oven by
a qualified technician. To change the belt direction, the technician must reverse the motor direction
and rotate the conveyor belt for proper oven function. A technician can also change the temperature
display from Fahrenheit to Celsius. These changes can be made by the technician during the start-
up/check-out or at a later date.
ERROR CODES
Error codes will display as flashing text messages for diagnostic purposes. Any temperature or
thermocouple error should turn the temperature output OFF and leave the conveyor running at the
same speed. The belt error should turn the temperature output OFF. The speed error should display
when the motor is unable to settle at the chosen speed. This might occur if a fast speed is chosen
that the motor is unable to spin fast enough to achieve. The speed signal output will remain the same
but the display will flash the error message.
Summary of Contents for Holman Ultra-Max UM1833A
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