Air conditioning unit having an internal combustion engine which is suitable for mounting on the roof of a building

An air conditioning unit suitable for gasketed support and mounting on support curbing having first and second curb sides and first and second curb ends which collectively define a continuous support surface, comprising:

• a metallic main unit frame having a rectangularly configured outer structure which includes first and second sides and first and second ends for support by the continuous surface of the curbing,
• a metallic power pack support frame having first and second spaced parallel members substantially continuously supported along their complete lengths by the first and second sides, respectively, of the main unit frame, and third and fourth spaced parallel members each having first and second ends fixed to the first and second parallel members, respectively, with said third and fourth spaced members being unsupported between their fixed ends, such that the third and fourth members function as leaf springs,
• vibration and sound absorbing means disposed between the first and second members of the power pack support frame and the main unit frame,
• a refrigerant power pack assembly comprising an internal combustion engine and a refrigerant compressor mounted on a metallic support tray,
• and a plurality of vibration absorbing mounts for resiliently mounting the support tray of the power pack assembly to the third and fourth spaced members of the power pack support frame, with each of said plurality of vibration absorbing mounts being spaced inwardly from a selected end of the third and fourth members.