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Series 8900SH Control Panel Operation And Installation Manual
Section 4 Sensor Calibration
rotate the screwdriver slot on the potentiometer R26 until the temperature shown on the
display matches the outside temperature. The sensor is now calibrated.
Now locate the Return Water Line sensor and measure the temperature as close as possible.
Then, at the control panel enter 12. The display will show what the panel believes is the Return
Water Line temperature. Correct as before, turning the screwdrive slot on potentiometer R27.
There are three ways to determine accurate Return Water Line temperature.
1. Clean the copper surface of the return line next to the sensor well and tape the
thermometer probe to the clean copper. Wait until the temperature shown on your digital
thermometer stabilizes, and accept that as the correct temperature.
2. Remove the sensor from the well and let it hang in the air as far away from the hot
return line as possible. Place your thermometer probe next to the sensor in the air. Wait for
your digital thermometer to stabilize: Take that temperature and use it to calibrate your sensor.
When you return the sensor to the well on the return line, the sensor will show an accurate
temperature.
3. Insert the probe of your digital thermometer next to the sensor in the sensor well on the
Return Water Line.