WPT Battery Replacement Tech Note
Doc No. 910-00022-01 Rev 01
Page 5 of 7
Figure 7. Friction Clip and Control Lever
6. When the desired control pressure is achieved, press the OVR button to exit and
save the value.
7. A confirmation screen will appear and flash the stored control pressure for 3 seconds.
Repeat the calibration procedure if this value does not match the desired control
pressure.
NOTE: The WPT will automatically exit Calibration Mode if OVR is not pressed after 3
minutes. The control pressure will NOT be saved and the WPT will return to
the home screen.
8. Replace the WPT front cover.
2.3.2. WPT firmware v22.00 & v23.00
1. Adjust the setpoint manually using the ▲ or ▼ key to match the ambient temperature
value displayed on the LCD.
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. Refer to Figure 8.
4. Use a 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”.
5. When finished, press the OVR button once again, or just wait for the mode to time-
out.
6. Replace the WPT front cover.
NOTE: Single pipe WPTs might take a longer time to respond during calibration.
Please allow sufficient time to calibrate the WPT accurately.
Control Lever
Friction Clip
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