Every AccountCentral .aspx page has a "security" control, this can be used to require SSL on a page by page level.
ex: <xct:security id="security" runat="server" requireSSL="false" />

In that control there is a "requireSSL" property. (true/false)
--If the property is set to "true" the page will automatically redirect and force an ssl/https connection. 
--If the property is set to "false" the page will automatically redirect and force a standard non-ssl/http connection.

Global override to disable ssl:
In some installs there is a need to keep the security control settings in place, but disable all ssl redirect in the application.  All requireSSL settings can be overridden by setting the following key in the application web.config file:
<add key="DISABLESSL" value="TRUE"/>  <!--TRUE/FALSE-->