OTC25 N Operation
To enter the configuration menu, press and hold the Parameter key 
for 10 seconds until the display changes to the parameter mode. Press the Parameter key again to index through the avail- able parameters. Pressing the Parameter Key for 3 seconds or allowing 60 seconds of inactivity will cause the OTC25 N to exit the menu system and return to normal operating mode.
Parameter | Range | Range | Display Options Default | Default |
| °F | °C | °F | °C |
Default |
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Display |
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Control | 2 to | 1 to |
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Hysteresis | 252 | 140 |
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Display |
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Offset | 126 | 70 |
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Deviation | OFF, 1 | OFF, 1 |
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Band Alarm | to 252 | to 140 |
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Display |
Units |
Low | Fixed | Fixed |
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Calibration |
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High | Fixed | Fixed |
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Calibration |
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3
Figure 5a. Series OTC25 N Parameters and Default Settings
Parameter Descriptions
Default Display 
This parameter determines whether the OTC25 N’s display shows the Setpoint or the actual temperature by default. Regardless of the selection made here, the operator can observe the other value by momentarily
pressing the Parameter 
Key. This will cause the alternate value to be displayed for five seconds.
Control Hysteresis 
Control Hysteresis is adjustable between 2 and 252° F (1 to 140° C ). This parameter is used by the control algorithm to prevent rapid cycling of the output around Setpoint. The default value is 4° F (2° C). This means the heat will turn OFF when the Actual Temperature exceeds the Setpoint by 2° F (1° C). Conversely, the heater will not turn ON until the Actual Temperature drops 2° F (1° C) below the Setpoint.
Display Offset 
Display Offset is adjustable from
