Abstract: An air handling unit that includes a main support member and front, rear and top covers mounted on said support that forms a housing for enclosing said unit. The covers have side walls that close over the support frame in abutting contact to form an interlocking seam therebetween at closure. Ribs are mounted upon the side walls of the support frame which bias the side walls of the covers outwardly to render the seam relatively air tight at closure. Two covers are securely affixed to the main support member while the other is removably attached to the main support member by a latching means. A HEPA filter is mounted in the main support member along with a blower system for drawing air through said housing.

Abstract: Apparatus for aligning and mounting a circuit board in a confined space that includes a pair of mounting pads extending outwardly from a wall. A tab is mounted on the wall over the pads so that a circuit board can be received between the pads and the tab. A rest mounted apart from the wall for supporting the board in a desired plane and a fastener for securing the board to the rest.

Abstract: A filter assembly for use in an air purifier unit having a rectangular shaped air inlet entrance to the unit blower. A rectangular shaped frame containing a HEPA filter pack is slidably received within the blower inlet. An L-shaped flange surrounds the filter frame and closes against the air inlet of the blower to provide an air seal. The top wall of the flange is offset some distance from an adjacent wall of the frame to provide a handle for the filter assembly.

Abstract: A bulb mounting for air handling equipment indicator bulbs that include at least a lamp base having a top flange. The mounting includes an air handling equipment support member having a hole, and retaining surface disposed a predetermined distance above an equipment support wall, that slidably receives the lamp base so that the flange rests on the retaining surface. The mounting further includes a top cover having an opening large enough to receive the bulb, and a tube shape that presses the flange against the retaining surface. The cover top side is disposed a predetermined distance above the flange, so that the bulb is positioned and secured a precise distance relative to the top of the cover and the equipment support wall.

Abstract: Apparatus (20) for mounting the horizontal compressor (10) of a vapor compression air conditioner to a foundation includes an L-shaped bracket (21) at each compressor end, each bracket having a horizontal leg (21H) adapted for attachment to mounting lugs (11) which extend laterally outwardly from the compressor casing. Each bracket is sized and otherwise configured so that its vertical leg (21V) extends upwardly from the horizontal leg along the outside of an end (102 or 103) of the compressor casing (101) to a point above the drive shaft axis of rotation (A.sub.R) of the compressor motor. A pin (22) is secured to and extends outwardly from the vertical leg of the bracket. The longitudinal axis of each pin is coincident with the driveshaft axis of rotation. Each pin extends into a pin socket (25) in a respective mounting support (24) which is securely fastened to a foundation (30) such as the base pan of an air conditioner.

Abstract: A connector plug (10, 20) for making electrical connection to the terminal assembly (40) of a hermetic compressor for an air conditioning or refrigeration system. The plug has a flexible skirt (15) that extends axially downward to fit snugly over the shoulder (43) of the body (41) of the terminal assembly when connected. An ear (16, 26) extends from the side wall (13) of the plug and has an engaging slot (17) which is sized and configured so that the engaging slot engages a stud (52) that extends from the compressor shell (51) in the vicinity of the terminal assembly when the plug is correctly installed on the terminal assembly. The ear may also include a cavity for receiving a thermal overload sensor (71) that may be associated with the compressors.

Abstract: A system for recovering compressible refrigerant from a refrigeration system, of the type having a compressor for lowering the pressure in the refrigeration system to effect the withdrawal of the refrigerant therefrom, and directing the refrigerant to a storage cylinder. The system is operable in a storage cylinder cooling mode of operation wherein the temperature and pressure of the refrigerant withdrawn from the system and stored in the cylinder is lowered. A control system for limiting the pressure ratio across the compressor during operation of the recovery system is provided. The control system includes first means for determining the suction pressure of the compressor and for terminating operation of the recovery system when a desired termination pressure is reached.

Abstract: An electronic control box is provided with an internally disposed vent channel which carries ambient air from a bottom opening to the top portion of the control box. The cooling air is then caused to flow downwardly through the control box and over the electronic components by way of a bottom opening which is fluidly connected by a vent tube to a negative pressure area created by the fan. The flow of cooling air through the control box is therefore promoted while maintaining the water-tight integrity of the box.

Abstract: A mounting arrangement for securing a tubing subassembly without requiring fixturing of the tubing relative to a coupling is disclosed. A mounting bracket including arcuate openings is designed to receive the coupling. A mounting flange having fastener receiving openings is positioned to secure the coupling in position such that fasteners may be inserted through the arcuate slots to secure the mounting bracket to the mounting flange to maintain the coupling and the attached tubing subassembly in the desired configuration and orientation.

Abstract: Apparatus for securing a heat transfer unit to either a wall or a ceiling is disclosed. A fastening panel forming a portion of the heat transfer unit further defines a series of projecting tabs having narrowed tab inclined portions connecting the tabs to the rear panel. Mounting brackets are provided having mounting openings with both wide and narrow portions. The openings are designed such that the tab inclined portion is secured within the mounting opening narrow portion with the tab body abutting a portion of the mounting bracket to maintain the fan coil unit in a secured horizontal position. The bracket might additionally be utilized to secure the unit in a vertical position as when mounting the unit to a wall.

Abstract: A method and apparatus utilizing a hot gas defrost system wherein superheated gas from the system compressor is conducted into a heat exchanger mounted within an accumulator for supplying heat to vaporize liquid refrigerant received from the evaporator. After the gas passes through the heat exchanger it is conducted to the condenser where it is condensed to a liquid and then routed to the evaporator. In the evaporator or frost accumulating coil the liquid refrigerant is subcooled, supplying heat to melt the ice formed on the evaporator surfaces and the liquid is thereafter conducted to the accumulator where the heat supplied from the heat exchanger acts to vaporize the fluid. The vaporized refrigerant is then recycled to the compressor to complete the system.

Abstract: A method and apparatus utilizing a hot gas defrost system wherein superheated gas from the system compressor is conducted into a heat exchanger mounted within an accumulator for supplying heat to vaporize liquid refrigerant received from the evaporator. After the gas passes through the heat exchanger it is conducted to the condenser where it is condensed to a liquid and then routed to the evaporator. In the evaporator or frost accumulating coil the liquid refrigerant is subcooled, supplying heat to melt the ice formed on the evaporator surfaces and the liquid is thereafter conducted to the accumulator where the heat supplied from the heat exchanger acts to vaporize the fluid. The vaporized refrigerant is then recycled to the compressor to complete the system.

Abstract: An expansion device for use in a reversible vapor compression refrigeration cycle for producing, upon demand, either heating or cooling. Two devices are mounted in opposed relationship in a supply line carrying refrigerant between a first heat exchanger and a second heat exchanger. Each expansion device includes a body having a flow passage therein opening into an expanded chamber. A free-floating piston is slidably mounted in the chamber and is moved to a first position when refrigerant is passed through the line in a first direction and to a second position when the direction of flow is reversed. A centrally located metering port passes through the piston while fluted channels are formed in its outer periphery. When in the first position, the fluted channels are closed against one side wall of the chamber and refrigerant is throttled through the metering port from the high pressure exchanger (condenser) into the low pressure exchanger (evaporator).