You can control this with for example
minScale: 54168.1
On the layer, or use style rule and use :
maxScaleDenominator: 60000000,
minScaleDenominator: 433344,
The values are of course not hardcoded. That will let you control the layout depending on any zoomlevel.
I've written a more detailed code sample heremore detailed code sample here , hope this helps.
edit: Can't seem to get this to get drawn in jsfiddle, feel free to fork/edit and let me know: http://jsfiddle.net/gplv2/9YBYG/