World Leaders in Ultra-Pure Heating
Revision 10
www.heateflex.com
01/17/13
405 E. Santa Clara St.
Arcadia, CA 91006-7218
Tel: (626) 599-8566 Fax: (626) 599-9567
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3.2.3 Recalibration
This screen consists of the D.I. Temperature Set Point, Actuator Control buttons and
parameters, current system status information, the Look-Up Table, and screen-change buttons.
It is on this screen that most of the temperature-control parameters are set. The time interval
and actuator increment for the trimmer function for temperature control can be set on this
screen.
To change the D.I. temperature set point simply press the button located in the box entitled D.I.
TEMP. SET POINT. Please note that an “administrative password” is required to change the
set point.
The Look-Up Table can be configured by pressing the buttons located in the box entitled
LOOK-UP TABLE. Beginning with an empty Look-Up Table, press the box under D.I.
TEMP. SET POINT, enter the “administrative password” if necessary and enter the desired
process set point value.
Next, take the maximum flow rate in GPM that will be required for the
unit and divide by ten. This number will become the approximate increment for the FLOW
RATE column in the Look-Up Table. Enter this value for the Look-Up Table under FLOW
RATE by pressing the box in the first row.
Next, open an outlet valve until the flow rate is at the increment entered in the first position.
Then using the “HOT” and “COLD” buttons located in the box entitled ACTUATOR
CONTROL, manually move the actuator until the actual D.I. temperature corresponds with the
set point temperature. Please note that the “operational password” is required to manually
control the actuator. A 100% value for the actuator position corresponds to fully hot (hot valve
is completely open) and 0% to fully cold (cold valve is completely open).
Note: The time for the thermocouple sensor to get an exact reading is approximately 10
to 15 seconds; therefore it is necessary to pause between the movements of the actuator in
order for the temperature to stabilize.
Once the temperature stabilizes, enter the actuator position value required to stabilize the
temperature into the Look-Up Table by pressing the box on the respective row under ACT.
POS. (Actuator Position). Repeat this until the entire Look-Up Table is complete. Finally,
press the “AUTO” button to return the control of the actuator to the PLC.
These recalibration instructions are also available on the touch screen. Press the
“RECALIBRATION INSTRUCTIONS” button to bring up the screen with the instructions for
setting up the Look-Up Table, which is detailed above.
