Enumeration for modes of operation
type OperationModes = enumeration(occupied "Occupied", unoccupiedOff "Unoccupied off", unoccupiedNightSetBack "Unoccupied, night set back", unoccupiedWarmUp "Unoccupied, warm-up", unoccupiedPreCool "Unoccupied, pre-cool", safety "Safety (smoke, fire, etc.)");