This Drawing is of Air Conditioner Inner front elevation. To function at their best, air conditioners and heat pumps must be positioned on level ground. 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 the direction of voltage and current are constantly switching, 60 times per second in North America. for More Details and Information Download the Drawing File.