Series 8900SH Control Panel | Operation And Installation Manual |
SECTION 4: SENSOR CALIBRATION
This section will deal with the calibration of the sensors that measure both outside air temperatures and water system temperatures. Correct calibration is very important so the control panel receives the accurate information necessary to properly control the building temperature.
The TRIAD system uses a minimum of two sensors, one which is placed outside, on the north or northwest side of a building, and the second which is placed in the Return Water Line coming back to the boilers.
The panel moniters temperature by passing a very weak electrical current through the sensor and back to the control panel. The resistance to this current changes when the temperature around the sensor changes, which is interpreted by the panel as an increase or decrease in temperature.
CALIBRATION:
To calibrate the sensors you will need an accurate digital thermometer, a small
PLEASE NOTE THAT THE SERIES 8900SH CONTROL PANEL MUST BE TURNED ON FOR AT LEAST 15 MINUTES BEFORE ATTEMPTING TO CALIBRATE THE SENSORS.
Press the function CODE for the sensor to display the current reading.
CODE xx = Potentiometer # = Sensor #
CODE 11 = R26 = Outdoor Sensor = S1
CODE 12 = R27 = Return Temp. Sensor = S3
Take off the cover of the main circuit board by loosening the two screws on either side of the cover and pulling it straight off.
The sensors should be wired up to the sensor terminal strip. If they are not, skip to “Troubleshoooting The Sensors” in Section 5.
Then, locate the outside sensor and take a reading with your digital thermometer as close as possible to the sensor. Now, go directly back to the control panel and enter 11. The display light will indicate what the panel thinks is the temperature at the outside sensor; (S1). Carefully
Section 4 | Sensor Calibration |
