User's Manual

EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE

EN2B-0285GE51 R0909

APPENDIX A: USING AN LNS TOOL TO COMMISSION A FAN COIL UNIT

Temperature Sensor Calibration

The temperature sensor in the Excel 10 wall modules can be

calibrated to correct for sensor inaccuracies, wire resistance,

etc. This allows the Excel 10 FCU Controller to sense the

space temperature with a high degree of accuracy.

Procedure

Select the controller being worked on with the LNS tool.

From within the LNS tool, with the desired project loaded and

the SLTA (Q7752A) connected to the LonWorks network,

perform the following procedure:

1. Select a controller symbol from a network diagram.

2. Click on Calibrate from the Controller menu. Once the

LNS tool logs on to the controller, the Room

Temperature Calibration dialog box appears.

3. The box displays the Current Value of the sensor and

the current Offset; it also contains a field for entering

the actual Measured Value. When a value is typed in

and Calibrate is clicked, the offset value is

automatically calculated, displayed, and written to the

Excel 10 FCU Controller.

Fig. 19. Calibration dialog box

4. Click on Close after completing adjustments.