1. A field configurable mechanism for defining labels for enumeration values of parameters in a heating, ventilation and air conditioning wall module, comprising: a computer having a display; a controller connected to the computer; a heating, ventilation and air conditioning (HVAC) wall module connected to the controller; and a wall module configuration tool situated in the computer; and wherein: the tool provides a configuration screen for categories and parameters on the display; the tool presents a first area of the screen showing categories and parameters available in the HVAC wall module, and a second area of the screen for accessing details of a parameter; a name of the parameter is enterable as one or more characters in a designated space in the second area of the screen; a button is clickable to define an enumeration range, which results in a showing of an enumeration library screen; one or more ordinals and labels corresponding to the one or more ordinals, respectively, are enterable in corresponding designated spaces in the enumeration library screen; each ordinal and label pair is addible to a top list in the enumeration library screen; an enumeration name is enterable to allow the top list to be saved to a library for use on another parameter; a selection of the enumeration name from the library results in the screen for parameters; the enumeration name designates an enumerated parameter; and a box in the screen for parameters reveals the ordinals and labels for the enumerated parameter.