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Turn dial which way to increase speed?

I have a grundfos selectric ups 15-50 pump. Do I turn grey dial clockwise or anti-clockwise to increase speed? (There are no indications on pump).
John, September 2017
http://uk.grundfos.com/products/find-product/ups2.html#overview

Acp, September 2017
link Click here to see other fixes for Grundfos.