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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.
Enable Test Mode.
See
P
ERFORMING
S
YSTEM
T
ESTS
.
Press any button to display the first test menu.
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.
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.
Using the thermocouple calibrator, apply the
appropriate temperature to the control input.
CALIBRATING
TEMPERATURE
SENSORS
microKool Portable Chillers UGH004/0999
5-12 MAINTENANCE
Special Tools Needed:
❒ thermocouple calibrator
1
2
3
4
5
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