Issue
Changed MNL controller application engineering units to Metric (Celsius temperature) using the hardware wizard.
After downloading the modified application, the setpoints and setpoint range on the MN-Sx sensor are still reading in degrees Fahrenheit.
Product Line
TAC IA Series
Environment
- I/A Series WorkPlace Tech Tool software.
- I/A Series MNL
- I/A Series MNB
Cause
Changing the engineering units from English to Metric using the Hardware Wizard does not alter the values already configured for the setpoints or setpoint ranges in the MN-Sx sensor.
The standard applications have predefined setpoint values and setpoint ranges based on the application type and MN-Sx type. These setpoints and setpoint ranges are configured with values appropriate for the operation of the controller using English engineering units (Fahrenheit temperatures). When the controller's engineering units have been changed to Metric, the appropriate temperature setpoint values and temperature setpoint ranges must be entered via the appropriate screen of the
Resolution
After using the WorkPlace Tech Tool Application Wizard to change the controller's application engineering units, the entered values for any setpoints and setpoint ranges must be reentered as numbers appropriate for the new engineering units. The application template files are configured for English (standard) engineering units with temperatures in Degrees Fahrenheit.
For example, the default space temperature setpoint is 70 degrees. By default, the controller is configured for English engineering units, resulting in the space temperature setpoint is 70 degrees Fahrenheit. Changing the controller engineering units to Metric will result in the default space temperature setpoint being 70 degrees Celsius unless the setpoint and setpoint range is redefined using the Hardware Wizard.
