Abstract: A refrigeration system for use in a refrigerator unit, the refrigeration system including a compressor having an ON state and an OFF state, a condenser, a temperature sensor, an evaporator, and an evaporator fan motor assembly. The evaporator fan motor assembly has an evaporator fan motor, a fan blade, and an internal control system. The internal control system of the evaporator fan motor assembly is adapted to sense the compressor state and is further adapted to operate the evaporator fan motor in response to the sensed compressor state. The refrigeration system may further include a condenser fan motor assembly. The condenser fan motor assembly has a condenser fan motor, a fan blade, and an internal control system. The internal control system of the condenser fan motor is adapted to sense the compressor state and is further adapted to operate the condenser fan motor in response to the sensed compressor state.

Abstract: A multi-purpose interrupter for interrupting the current flow from a cathodic protection rectifier. The multi-purpose interrupter may be placed within a rugged enclosure and is configured to interface with one or more relays, is configured to interface with an RMU, is configured to interface with a selector switch, and is configured to be housed within an enclosure housing the cathodic protection rectifier. Responsive to a signal from the RMU or the selector switch, the multi-purpose interrupter is configured to interrupt the current flow from the cathodic protection rectifier.

Abstract: Apparatus for protection against undesired thermal transfer comprising a printed circuit board (15), an infrared sensing device (100) electrically connected to the printed circuit board (15) by way of an electrical lead (12), and solid thermally insulating material (18, 20) between the board (15) and the device (100) and protecting that side of the device (100) facing the board (15) from thermal transfer from the board (15) to the device (100). The solid thermally insulating material (18) bounds a passageway (19) in the material (18) through which the lead (12) passes. Advantageously, the in sensing device (100) is in thermal communication with a heat sink (14) and the solid therm:ally insulating material (20) protects the heat sink (14) also against such thermal transfer from the board (15), i.e. thermal radiation from the board (15) and thermal convection currents induced by the board (15).

Abstract: A collapsible enclosure includes a roof, a rear wall, a pair of sidewalls, a front wall, each wall having an outside and inside surface and an open bottom. The cover includes heat insulation material covering substantially all of each inside surface of each wall. A hinge pivotally mounts the roof to rear wall and a hinge pivotally mounts each side wall to the rear wall. Bolt fasteners removably attach the front wall between the side walls. A heating element is disposed within the housing. The front wall includes an upper panel and a lower panel mounted together by a hinge in a manner to allow the upper panel to be foldable outwardly and downwardly to position the outside surface of the upper panel against the outside surface of the lower panel.

Abstract: Difficulties in obtaining consistent bonds of high quality between side pieces and tubular headers (10), (12) in heat exchangers are avoided in a side piece (42) that extends between the headers (10), (12) and which has circular recesses (48) at each end (44), (46). The recesses (48) define resilient fingers (56), (58) which may separate to receive the ends of the headers (10), (12) and frictionally grasp the same, eliminating the need for fixturing at this location and assuring a strong consistent gripping of the headers (10), (12), by the end piece (42) to assure consistent bonds of high quality.

Abstract: Difficulties in obtaining consistent bonds of high quality between side pieces and tubular headers (10), (12) in heat exchangers are avoided in a side piece (42) that extends between the headers (10), (12) and which has circular recesses (48) at each end (44), (46). The recesses (48) define resilient fingers (56), (58) which may separate to receive the ends of the headers (10), (12) and frictionally grasp the same, eliminating the need for fixturing at this location and assuring a strong consistent gripping of the headers (10), (12), by the end piece (42) to assure consistent bonds of high quality.