A big mistake is the disconnect is mounted to the unit on a panel that needs to be removed for unit servicing.
Part of 440.14
The disconnecting means shall not be located on panels that are designed to allow access to the air-conditioning or refrigeration equipment.
Sometimes it is almost imposable to find a mounting place on the unit that is not a removable panel, a condenser coil, a vent for air flow and still provides the 110.26 workspace that some inspectors require and some do not.
Creative use of uni-strut will get you around these issues.
