8.1 User Interface Board
The user interface board is located inside the interior control panel. The front of the interface board is
covered with the decorative overlay showing the display and keypad features.
Please refer to the “User Interface Quick Reference Sheet” for a description of settings and functions in
this manual.
The user interface board is a 12 volt DC circuit that interfaces: keypad & display functions, compart
-
ment temperatures, set-points, light functions, alarms, message center, Sabbath mode, error codes, and
service diagnostics.
The user interface board is factory programmed and is not adjustable or re-programmable in the field.
See the Software Section for further reference.
Located on the back side of the user interface board are the electrical connections for the communication
cable and both upper and lower thermistor cables. A run time battery is also located on the rear of the
user interface board. This battery supplies power to the memory during off periods. Located on the bat
-
tery face, is a sticker with the software version written in ink (See figure 12.36).
The user interface board is only available as an assembly piece which includes the control housing and
overlay. This is because of possible static issues that might possibly damage the user interface.
SEE PHOTO SECTION FOR REFERENCE TO ABOVE MENTIONED FIGURES
8.1.1 Replacing the User Interface Board
1) There are two (2) locater holes in the front of the control housing (See figure 12.35).
2) Use a 5/16” nut-driver to loosen the screws, do not remove, these screws can be used to re-locate
the control housing when re-installing.
3) After the screw have been loosened, pull the housing forward and let suspend.
4) Reach behind the housing and disconnect the communication and thermistors cables using thumb
pressure.
5) Remove the cables from the nylon clips that secure the cables to the control housing.
6) Reverse the above process to re-install.
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