EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE

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.

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Honeywell W7752D specifications Temperature Sensor Calibration, Procedure

W7752D specifications

The Honeywell W7752D is a versatile and advanced electronic gas combination control designed primarily for use in commercial heating systems. This product stands out for its ability to manage both gas ignition and safety functions, which are critical for maintaining the efficiency and safety of heating appliances. Its robust construction and advanced features make it a popular choice for HVAC professionals and service technicians.

One of the main features of the W7752D is its integration of multiple functions in a single device. It serves as both an automatic gas ignition control and a safety shut-off valve, which simplifies installation and reduces the need for additional components. This integrated design not only enhances reliability but also streamlines maintenance procedures.

Another notable technology utilized in the W7752D is its microprocessor-based control logic. This advanced technology allows for precise management of the ignition sequence, improving the overall efficiency of the heating system. The microprocessor enables the control to adapt to varying operating conditions, ensuring optimal performance even under changing demands.

The W7752D is equipped with features that enhance user-interface and diagnostics capabilities. It includes LED indicators that provide clear information about the operational status and any potential issues. This diagnostics capability facilitates easier troubleshooting, saving time and reducing the likelihood of extended downtimes.

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In summary, the Honeywell W7752D combines advanced technology with essential safety features, making it a top choice for commercial heating applications. Its integrated design, microprocessor-based control, user-friendly diagnostics, and robust safety mechanisms make it an essential component for efficient and safe gas heating systems. Whether it is for new installations or replacements, the W7752D provides HVAC professionals with the reliability and ease of use they demand.