Abstract: A device that heats/cools air includes a heat exchanger that contains hydronic fluid; a blower that moves air over and/or through the heat exchanger; a pump that circulates the hydronic fluid; a first vessel that contains hydronic fluid under pressure, air, a sealed first opening, a second opening that allows the hydronic fluid to exit the first vessel, a third opening that allows the hydronic fluid to enter the vessel, and a fourth opening; a second vessel that contains hydronic fluid at atmospheric pressure, a sealed first opening, and a second opening in communication with the first vessel, wherein the second vessel is in communication with the fourth opening; a valve that allows hydronic fluid to flow from the second vessel to the first vessel when pressure inside the first vessel decreases below zero psig, and prevents hydronic fluid from flowing from the first vessel to the second vessel.

Abstract: A device that heats/cools air includes a heat exchanger that contains hydronic fluid; a blower that moves air over and/or through the heat exchanger; a pump that circulates the hydronic fluid; a first vessel that contains hydronic fluid under pressure, air, a sealed first opening, a second opening that allows the hydronic fluid to exit the first vessel, a third opening that allows the hydronic fluid to enter the vessel, and a fourth opening; a second vessel that contains hydronic fluid at atmospheric pressure, a sealed first opening, and a second opening in communication with the first vessel, wherein the second vessel is in communication with the fourth opening; a valve that allows hydronic fluid to flow from the second vessel to the first vessel when pressure inside the first vessel decreases below zero psig, and prevents hydronic fluid from flowing from the first vessel to the second vessel.

Abstract: An electrical feedthrough assembly for providing connection to components of a compressor includes a housing having an inner surface defining a channel. A sealed wire assembly is provided in the channel. The sealed wire assembly includes a body having an outer surface and a plurality of wires sealingly passing through the body.

Abstract: An electrical feedthrough assembly for providing connection to components of a compressor includes a housing having an inner surface defining a channel. A sealed wire assembly is provided in the channel. The sealed wire assembly includes a body having an outer surface and a plurality of wires sealingly passing through the body.

Abstract: A compressor can have one or more of a suction fitting with integral louvers and a screen, a motor cap with a plurality of holes in the top surface of the motor cap to permit refrigerant to enter a suction plenum, a filter positioned over the plurality of holes in the motor cap, a filter for the cage bearing and a braze ring installed in one or more of the compressor fittings.

Abstract: An electrical feedthrough assembly for providing connection to components of a compressor includes a housing having an inner surface defining a channel. A sealed wire assembly is provided in the channel. The sealed wire assembly includes a body having an outer surface and a plurality of wires sealingly passing through the body.

Abstract: A two-stage rotary compressor having a compression mechanism including a single muffler housing member. The single muffler housing member at least partially defines an intermediate pressure discharge cavity and a discharge pressure discharge cavity. In one exemplary embodiment, the compression mechanism includes a cylinder block having a plurality of vanes positioned within slots formed in an inner cylindrical surface of the cylinder block. The slots are in fluid communication with the discharge pressure discharge cavity and receive discharge pressure working fluid to bias the vanes radially inwardly. In another exemplary embodiment, the cylinder block includes a plurality of passages for the delivery of working fluid to and from the cylinder block.

Abstract: A two-stage rotary compressor having a compression mechanism including a single muffler housing member. The single muffler housing member at least partially defines an intermediate pressure discharge cavity and a discharge pressure discharge cavity. In one exemplary embodiment, the compression mechanism includes a cylinder block having a plurality of vanes positioned within slots formed in an inner cylindrical surface of the cylinder block. The slots are in fluid communication with the discharge pressure discharge cavity and receive discharge pressure working fluid to bias the vanes radially inwardly. In another exemplary embodiment, the cylinder block includes a plurality of passages for the delivery of working fluid to and from the cylinder block.

Abstract: A multi-stage compressor having a shaft with two eccentrics that are offset with respect to the shaft axis of rotation in substantially the same radial direction, compressor also having two vanes oriented in substantially opposite radial directions with respect to shaft axis. Also, a multi-stage compressor having a first-stage cylinder for compressing a fluid, e.g., a refrigerant, from a low pressure to an intermediate pressure, a second-stage cylinder for compressing the refrigerant from the intermediate pressure to a high pressure, and a housing having an intermediate-pressure refrigerant outlet in direct fluid communication with the first-stage cylinder and an intermediate-pressure refrigerant return inlet in fluid communication with the interior of the compressor housing. Also, a compressor having a vane operably engaged with a shaft eccentric and a spring biasing the vane toward the eccentric, wherein the amount of biasing force applied by the spring is adjustable.

Abstract: A refrigeration system for freezing fluid in a tray during a first operating mode and defrosting the ice during a second operating mode to facilitate the removal of the ice from the tray. In the first operating mode, refrigerant circulates through a circuit in a first direction and, in the second mode, the flow of refrigerant is reversed in a portion of the circuit. In the first operating mode, cool refrigerant exits an expansion device in the circuit and enters into the evaporator to freeze a fluid in the tray. In the second operating mode, a valve is operated to permit warm refrigerant exiting the compressor to enter into the evaporator to melt a portion of the ice reversing the flow of refrigerant therein. A second valve permits the reverse flow of refrigerant through the evaporator to return to the compressor inlet instead of passing through the expansion device and condenser.