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Normal Operation
NOTE: The Chiller incorporates a special "lockout" feature that can be enabled to prevent unauthorized or
accidental set point and other operational changes. This feature is described in detail under "Enabling and
Disabling the Local Lockout." It should not be enabled until all operational parameters have been set.
Selecting the Temperature Unit (°C or °F)
The LEDs adjacent to the Temperature Display indicate the unit (°C or °F) used for Temperature Displays.
To change from °C to °F or vice versa, proceed as follows:
To change to °F — Place the Circuit Breaker/Power Switch on the rear of the instrument in the OFF
position. Press and hold the Units/Menu Select Button while returning the Circuit Breaker/Power Switch
to the ON position.
To change to °C — Place the Circuit Breaker/Power Switch on the rear of the instrument in the OFF
position. Press and hold the Power Button on the front panel while returning the Circuit Breaker/Power
Switch to the ON position.
IMPORTANT: All user settings, except baud rate and calibration offset, return to the original factory defaults
when the temperature unit is changed. The Chiller's temperature set point and various alarm settings should
be reset to desired values.
Displaying and Adjusting the Set Point
Press the Select/Set Knob on the front panel. The current set point temperature will be displayed, and the decimal
point at the bottom right of the display will flash, indicating that the temperature can be changed.
Rotate the Select/Set Knob until the desired set point temperature is displayed. The setting is accepted after the
Select/Set Knob is pressed a second time or automatically after a few seconds of inactivity.
NOTE: Temperature set point cannot be changed when the local lockout is enabled or remote temperature
control is installed and enabled. It allows the user to check or continuously display either the Chiller's internal
outlet fluid temperature or the external ambient/process temperature.
Selecting the Internal / External Temperature Display
NOTE: This section applies only when the ambient tracking probe or remote temperature control is installed
and enabled. It allows the user to check or continuously display either the Chiller's internal outlet fluid
temperature or the external ambient/process temperature.
When the ambient tracking probe is selected (AtC), the Chiller normally displays the internal outlet fluid
temperature. To display the external ambient temperature, press and release the Units/Menu Select Button until
P2 appears on the Pressure/Flow Rate Display.
When the remote temperature control probe is selected (rPC), the Chiller normally displays the external process
temperature. To display the internal outlet fluid temperature, press and release the Units/Menu Select Button until
P1 appears on the Pressure/Flow Rate Display.
NOTE: P1 or P2 will remain on the pressure/flow rate display until the Units/Menu Select button is pressed
and released. The displayed temperature will revert to the default condition (internal temperature for the
ambient probe, external temperature for the remote temperature control probe).
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