Under the terms of all manufacturer's warranty and to comply with federal refrigerant handling laws, it is required that the system be checked, started up and signed-off on by a licensed air conditioning/heating contractor prior to use. Failure to comply with this provision will void all factory warranties. Keep a copy of the installation ticket for your records. Please ensure that all supply and return ductwork is properly sized and that a permit is obtained (where required). Always conform with applicable local and state codes. Electrical connections should only be made by a licensed electrical contractor. Unqualified persons should never attempt installation of this or any HVAC system.