Instruction manual

Parameter Key
Used to access available parameters to set or change values.
Raise Key
Used to scroll up through available parameter settings or to
increase values. (Hold for fast-step progression)
Lower Key
Used to scroll down through available parameter settings or
to decrease values. (Hold for fast-step progression)
Discrete LED Indicators
OTC25 N OTC25 L OTC25 P
Actual: amber Actual: amber Actual: amber
Setpoint: amber Setpoint: amber Setpoint: amber
Heat: orange Limit: orange Output 1: orange
Output 2: orange
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O p e r a t i o n
Three-Digit
LED Display
Displays measured
temperature, setpoint,
or parameter labels
and settings.
Figure 4. Front Panel Controls and Indicators
O p e r a t i o n
Athena Series OTC25 Digital
Temperature Controller
Just a few easy steps are required before your OTC25
can be placed into service. After completing the mounting
and wiring procedures as previously instructed, set each
controller parameter using the simple front-panel keys
as instructed.
Power On
When power is first applied to the OTC25, all segments
of the LED display, as well as the discrete indicators, will be
momentarily illuminated while the instrument goes through a
series of diagnostic checks to verify proper operation of the
unit. A software version will then be displayed, e.g., .
The last two digits of this code indicate the software revision
supplied with your controller. Please provide this revision
number when contacting us regarding your unit. This display
is followed by a mnemonic code representing the OTC25
model type.