Thermolators with TW-1 or TW-2 controls use type “K” ther-
mocouples to sense the temperature in the return and supply
process lines. These thermocouples should be calibrated annu-
ally, or when a new thermocouple is installed, to ensure cor-
rect operation.
The Thermolator’s Calibration Mode provides zero and span
calibration of both the supply and return line thermocouples.
You access the Calibration Mode while in Test Mode.
Enable Test Mode.
See Performing System Tests, Section 5.
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.
TW-1, TW-2
C
ONTROL
CALIBRATING
TEMPERATURE
SENSORS
Thermolator TW Series UGH025-0504
5-10 MAINTENANCE
Special Tools Needed:
r type K 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
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