CALIBRATING
TEMPERATURE
SENSORS
Special Tools Needed:
❒thermocouple calibrator
The microKool chillers use thermocouples to sense the tem- perature in the return and supply process lines. These thermo- couples should be calibrated annually, or when a new thermo- couple is installed, to ensure correct operation.
The chiller’s Calibration Mode provides zero and span calibra- tion of both the supply and return line thermocouples. You access the Calibration Mode while in Test Mode.
1 Enable Test Mode.
See PERFORMING SYSTEM TESTS.
2 Press any button to display the first test menu. 3 Select the Calibration Mode menu.
Press and hold the Setpoint 
key for 3 seconds to index to each test menu until the controller indicates “SC.L” in the Actual display.
4
Release the Setpoint 
key.
You are now in calibration mode. Each press and release of this key will exit the current calibration and start the next calibration. The table below lists the calibrations that will be performed.
| SETPOINT | ACTUAL |
CALIBRATION | DISPLAY | DISPLAY |
Zero Calibrate Supply Sensor | 32° F (0° C) | SC.L |
|
|
|
Zero Calibrate Return Sensor | 32° F (0° C) | rC.L |
|
|
|
Span Calibrate Supply Sensor | 510° F (266° C) | SC.H |
|
|
|
Span Calibrate Return Sensor | 510° F (266° C) | rC.H |
|
|
|
5
Using the thermocouple calibrator, apply the appropriate temperature to the control input.
| MAINTENANCE | microKool Portable Chillers | UGH004/0999 |
