WPT Installation Manual
Document No. 910-00005-01, Rev 17
Page 11 of 19
3. Use a 1/16” hex Allen wrench and very carefully turn the calibration set screw on
the thermostat lever, shown in Figure 14, 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 15.
NOTE: Each battery segment on the LCD represents 0.25 PSI resolution, as shown
in Figure 13. 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 13. 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 14. WPT Calibration
Adjust this screw using a
1/16” Allen key to obtain the
required control pressure
Factory Calibrated Throttling
Range Adjuster Tab
