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Section 4
Section 4 Section 4
Section 4 –
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–Operation
OperationOperation
Operation
NOTE: The Chiller incorporates a special “lockout” feature that can be enabled to prevent
unauthorized or accidental changes to set point and other operational values. This feature is
described in detail in Section 4.8. It should not be enabled until all operational parameters are set.
4.1 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 unit in which temperature is displayed is changed. The Chiller’s temperature set
point and various alarm settings should be reset to the desired values.
4.2 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 the temperature can be
changed.
Rotate the Select/Set Knob until the desired set point temperature is displayed. The setting is
accepted after either pressing the Select/Set Knob a second time or will be accepted automatically
after a few seconds of inactivity.
NOTE: This function is not available when the optional ambient tracking probe or remote
temperature control probe is installed and enabled. See Sections 4.3, 4.4, and 4.7.8.
4.3 Displaying and Adjusting the Ambient Tracking Offset
NOTE: Ambient tracking is an optional function that may or may not be available on your Chiller. It
permits you to control cooling fluid temperature based on room or machine temperature plus or
minus a user-adjustable offset temperature.
When the optional ambient tracking probe is installed and enabled (AtC) (see Section 4.7.8), the
ambient tracking offset rather than the set point temperature is displayed when the Select/Set Knob
on the front panel is pressed.
To change the displayed offset value, rotate the Select/Set Knob until the desired offset value is
displayed. An offset value from -5.0° to +5.0°C (-9.0° to +9.0°F) may be entered. The setting is
accepted after either pressing the Select/Set Knob a second time or will be accepted automatically
after a few seconds of inactivity.
4.4 Displaying and Adjusting Remote Control Temperature
NOTE: Remote temperature control is an optional function that may or may not be available on your
Chiller. It permits you to control cooling based on the temperature of an external process.
When the optional remote control external probe is installed and enabled (rPC) (see Section 4.7.8),
the external temperature set point is displayed when the Select/Set Knob on the front panel is
pressed.
To change the external temperature set point, rotate the Select/Set Knob until the desired set point
temperature is displayed. The setting is accepted after either pressing the Select/Set Knob a second
time or will be accepted automatically after a few seconds of inactivity.
4.5 Selecting the Pressure / Flow Rate Display and Units
The Chiller can be set up to display either fluid pressure (in PSI or kPa) or flow rate (in GPM or
LPM). Pressing the Units/Menu Select button briefly toggles through the available selections.
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