Abstract: Vapor compression systems are supplemented with a charge control loop that includes a discharge control valve, a transfer pump, and a mass storage vessel configured to add or remove refrigerant to or from the refrigeration loop during operation to optimize efficiency according to variations in thermal load. Methods for operating the vapor control systems include adjusting the refrigerant charge in the refrigeration loop by activating the discharge control valve to remove refrigerant or by activating the transfer pump to add refrigerant, thereby maintaining optimal pressure and temperature conditions in the refrigeration loop over large variations in environmental temperatures. Refrigerant removed from the refrigeration loop through the discharge control valve may be held in the mass storage vessel until subsequently being added back into the refrigeration loop by the transfer pump.

Abstract: A gaming system includes a housing having a front opening with a perimeter, a frame having a front, and a front panel attached to the front of the frame. The frame supports the functional components of the gaming device, and is slidably moveable from a closed position in which the frame is substantially completely enclosed within the housing, to a service position in which the frame is extended at least partially forwardly through the front opening. The front panel is configured to mate with the perimeter of the front opening of the housing when the frame is in the closed position.