Tech note: WPT Battery Replacement
Doc No. 910-00022-01 Rev 01
Page 4 of 7
2.3.1. WPT firmware v25.00 or higher
1. To enter Calibration Mode, perform the following:
2. Press the ▼ button and OVR button together for two seconds. The display will show
‘dt’.
3. Press OVR four times. The LCD displays the branch pressure in PSI along with
PRESSURE indicator. The display shows “--" if the motor is in motion when trying to
access branch pressure.
4. Press all buttons simultaneously to enter Calibration Mode. The “C” icon will flash
rapidly while in this mode.
5. Use a 1/16” hex Allen wrench and very carefully turn the calibration set screw on the
thermostat lever, shown in
Figure 6, until the branch pressure is equal to the desired
control point. Use extreme caution not to allow the lever to rotate sideways while
adjusting the setscrew. Damage to the bi-metallic spring can result if the end of the
lever is allowed to move left or right by more than 1/16”.
NOTE: Ensure that there is at least one thread of calibration screw adjustment above
the top surface of the Friction Clip, or not less than one thread below the
bottom surface of the Control Lever as depicted in Figure 7.
NOTE: Each battery segment on the LCD represents 0.25 PSI resolution, as shown
in Figure 5. Pay special attention to this extra resolution while turning the set
screw. It is critical this value precisely matches the control point for seamless
operation.
Figure 5. Pressure Display Resolution
NOTE: Single pipe WPTs might take a longer time to respond during calibration.
Please allow sufficient time to calibrate the WPT accurately.
Figure 6. WPT Calibration
Adjust this screw using a
1/16” Allen key to obtain the
required control pressure
Factory Calibrated Throttling
Range Adjuster Tab
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