<p>This Drawing is of Air Conditioner Inner front elevation. To function at their best, <strong>air conditioners and heat pumps must be positioned on level ground</strong>. AC equipment can malfunction or wear out prematurely if the ground beneath them shifts or tilts more than a few degrees. Rather than a constant flow of current in a single direction (called direct current or DC), the vast majority of the power grid uses alternating current or AC, where <strong>the direction of voltage and current are constantly switching, 60 times per second in North America</strong>. for More Details and Information Download the Drawing File.</p>