Replace the navigation control by two controls, namely DragPan and MouseWheelZoom. DragPan is the map default drag control. MouseWheelZoom is the map default mouse wheel control.

src/ol/handler/MouseWheel.js

@@ -4,7 +4,8 @@
  * Provides a class for listening to mousewheel events on a DOM element
  * and dispatching mousewheel events to a map instance.
  *
- * The default behavior for the mousewheel event is zooming the map.
+ * Calls handleMouseWheelEvent on the map if default is not prevented by
+ * listeners.
  */
 
 goog.provide('ol.handler.MouseWheel');
@@ -47,9 +48,6 @@ ol.handler.MouseWheel.prototype.handleMouseWheel = function(e) {
     var newE = new ol.events.MapEvent(ol.events.MapEventType.MOUSEWHEEL, e);
     var rt = goog.events.dispatchEvent(this.map_, newE);
     if (rt) {
-        var defaultControl = this.map_.getDefaultControl();
-        if (defaultControl) {
-            defaultControl.defaultMouseWheel(newE);
-        }
+        this.map_.handleMouseWheelEvent(newE);
     }
-};
+};