Calibration process is done automatically by the Fibaro device once you change parameter 151 value to be '2'.
The problem you might have is that the device driver (not an official driver) might not update the parameter to '2' even when you try using the device page.
In order to make sure the parameter is set to '2' I suggest you use the Super Basic Z-wave Driver found here. Install it, assign it to the device and manually change the value to '2'. The device will run calibration (up-down-up cycle) and you ae done. Run the parameter report to make sure parameter is now set to '1' - "device is calibrated". Do not forget to change the driver again to the FGR-223 driver.
Let me know if it worked for you.
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