Abstract: A slit fin heat exchanger is formed by wrapping slit fin tubing into a flat coil having two spaced rows of tubing. The flat coil is located on mandrels which are rotatable about spaced parallel axes with the mandrels and axes initially being in the same plane. A piece of expanded metal is placed between the two rows. The mandrels are rotated about their axes in opposite directions which shifts the plane in which the coil is located. The shifting of the plane of the coil moves a portion of a first row of the coil into contact with a planar portion of a platen and the second row of the coil into a nesting relationship with the portion of the first row which is in contact with the planar portion of the platen and the piece of expanded metal. Continued rotation of the mandrels causes folding of the portions of the coil which extends the area of nesting. The folding takes place through up to 120.degree.

Abstract: A slit fin heat exchanger is formed by wrapping slit fin tubing around a pair of mandrels having expanded metal cylinders thereon into a flat coil having two spaced rows of tubing. The flat coil containing the expanded metal cylinders is located on mandrels which are rotatable about spaced parallel axes with the mandrels and axes initially being in the same plane. The mandrels are rotated about their axes in opposite directions which shifts the plane in which the coil is located. The shifting of the plane of the coil moves a portion of a first row of the coil into contact with a planar portion of a platen and the second row of the coil into a nesting relationship with the portion of the first row which is in contact with the planar portion of the platen. Continued rotation of the mandrels causes folding of the portions of the coil which extends the area of nesting. The folding takes place through up to 120.degree.

Abstract: A terminal plate assembly has a one piece inner terminal block for three pins or bolts and a separate outer terminal block for each pin or bolt. Sealing between the terminal plate and each pin is accomplished by two O-ring seals which are squeezed between the inner and outer terminal blocks. Additionally, one of the O-rings also serves to hold the assembled terminal blocks in place with respect to the terminal plate.

Abstract: The reversing of the direction of rotation of the motor of a fixed vane rotary compressor reverses the direction of rotation of the rolling piston. The rolling piston through viscous friction or frictional torque frictionally engages a reversing disk and causes the reversing disk to move between two positions depending upon the direction of rotation of the rolling piston. The reversing disk has a slot therein which forms the suction inlet and is moved by rotation of the reversing disk so as to be in fluid communication with the plenum which is serving as the suction plenum at that time.

Abstract: Sound transmission from an equipment room via the air conditioning ductwork must be reduced so as to permit the full use of adjacent areas. The ductwork located within the equipment room is made of a lighter gauge material to facilitate radiation of sound back into the equipment room. The flow is divided into a plurality of duct passages within the duct to achieve sufficient attenuation. Each of the duct passages is lined on all sides so that there is a double thickness of acoustic insulation between adjacent duct passages.

Abstract: A fluid pressure responsive member is shifted in accordance with the pressure differential between two lines either one of which can be a suction line with the other line being a discharge line of a reversible compressor. The fluid pressure responsive member has an arcuate recess formed therein which serves as a secondary suction port which provides fluid communication to the offset cylindrical chamber from the suction line in accordance with the position of the fluid pressure responsive member. Because the porting is responsive to the pressure differential between the two lines, the changeover of the porting is automatic upon the reversal of the operation of the compressor.

Abstract: An internal line break assembly for a hermetic compressor is assembled in two stages. A metal protector bracket is mounted to the stator as part of the mounting procedure for the stator. At a suitable later step a thermal protector in a protector mount is snapped into place whereby it is held in a spring biased relationship by the metal protector bracket.

Abstract: A fluid pressure responsive member is shifted in accordance with the pressure differential between two lines either one of which can be a suction line with the other line being a discharge line of a reversible compressor. The fluid pressure responsive member has a pair of arcuate recesses formed therein which serve as secondary suction ports which provide fluid communication to the elliptical chamber from suction lines in accordance with the position of the fluid pressure responsive member. Because the porting is responsive to the pressure differential between the two lines, the changeover of the porting is automatic upon the reversal of the operation of the compressor.

Abstract: A contact monitor and annunciator unit for providing a persistent warning in the event one of a selected number of event monitoring circuits associated with a mobile refrigeration system opens. The unit includes a number of warning circuits that are electrically isolated from the monitoring circuits by optical isolators and a separate power supply so that the initial cause of a shut down due to abnormal operating conditions can not only be annunicated but also differenciated from a shut down caused by a momentary power failure.

Abstract: A method of joining together two relatively thin work pieces by arc welding is disclosed. The work pieces are rotated relative to a welding electrode so that the welding electrode is moved at relatively high speed over a path of contact between the work pieces where the weld is to be made. The power density at the work pieces is controlled so that it is necessary to make several passes of the electrode over the path of contact between the work pieces to make the weld. This welding procedure produces a weld of high quality without the use of complex current programming which is required when using conventional arc welding procedures.

Abstract: A zoned variable volume system is provided with a pair of non-connected dampers in each zone. The first damper controls flow through a cooling coil. The second damper controls flow through a heating coil and provides heated or neutral air depending upon whether or not the heating coil is actuated. The fan speed is adjusted to cause at least one damper to be fully open so that the system operates at a minimum static pressure.

Abstract: The suction gas supply tubes are made integral with the seal for sealing the gap between the cylinder head and the cylinder block caused by the valve assembly. The suction gas supply tubes have flared inlets and a long, narrow tapering cross section to minimize flow loses. Additionally, the length of the tubes is such that they provide pressure pulse attenuation and tuning.

Abstract: A modular air conditioner package for circulating conditioned air within a transportable cargo container. The package includes a standard fan deck and evaporator unit that can be selectively mated inside the container along either the front or the top wall in a blow through or draw through configuration. The fan deck is mounted at the top front corner of the container and can be joined to the evaporator unit to provide four separate options for directing conditioned air downwardly along the front wall or rearwardly along the top wall of the container depending on the type of load being transported.

Abstract: The optimum charge in the heating and cooling modes is achieved in a reversible heat pump system by providing a receiver in the indoor section which is sized to store an amount of refrigerant equal to the difference in the optimum charge in each mode. The amount of refrigerant in the receiver is varied in response to the ambient temperature whereby the refrigerant charge is optimized over a range of temperatures.

Abstract: A diffuser is provided with three discharges. Two of the discharges are directed in one direction and, when installed, would be directed towards the outside wall of the conditioned space. The other discharge is directed in the opposite direction and would discharge into the interior of the conditioned space. Responsive to the temperature of the conditioned air being supplied, a thermally responsive actuator is in either one of two positions whereby either one of the two discharges in the one direction or the discharge in the opposite direction is blocked. This results in two discharges in one direction or one in each direction with the discharge area being the same in both instances.

Abstract: In each zone of a variable volume air distribution system, terminal satisfaction is determined. Responsive to the determination of the number of dissatisfied terminals, the air handling unit is controlled to minimize the output of the air handling unit while providing a predetermined degree of terminal satisfaction. The determination of the satisfaction of the terminals is based upon a direct or indirect sensing of temperature in the zones.

Abstract: A variable volume multizone unit is disclosed for simultaneously supplying variable amounts of cool, warm or neutral air to each zone, as required. The unit is under the overall control of a computer and controls dampers located at the unit to regulate the flow of cool and neutral or warm air to each zone individually and to control the total amount of air supplied to all of the zone.

Abstract: A bleed thermostat is provided with structure for determining at least one position of the bleed plate and therefore, the registration of the opening with the bleed port at that point. By selecting the full registration position, a condition indicative of terminal dissatisfaction is sensed. Additionally, in one embodiment, structure is provided for making the thermostat either direct acting or reverse acting to permit its use in either a heating or a cooling mode.