Abstract: A zone whose air supply volume and character is responsive to temperature data supplied from a single location in the zone is made responsive to the requirements of a subzone remote from the sensor location. The air supply to the subzone is changed responsive to an unsatisfied condition therein resulting in a changed supply to the area in which the sensor is located. As a result, the sensor responds to the changed air supply by indicating an unsatisfied condition to which the system responds by changing the amount of air supplied to the zone.

Abstract: A connector block operatively engages the pins of a terminal assembly in a frictional or other mechanical relationship such that the connector block is securely held in place. When held in place, the connector block overlies the pins such that they cannot be dislodged from the terminal assembly. Connectors located in the connector block provide frictional engagement with the pins while affording electrical access to the terminal assembly.

Abstract: In a compressor assembly, the motor compressor unit is vertically supported by lower bearing head which receives the crankshaft of the compressor. The lower bearing head is vertically supported by a positioning plate which is in turn vertically supported by a spring which is received in a recess in the casing. The mounting structure comprising the head, the plate and the spring coact to provide the sole vertical support of the motor compressor unit. This single vertical support is stable because the center of gravity of the compressor is coaxial with the centerline of the spring. The position plate may be rotated to accommodate compressors having different centers of gravity.

Abstract: A planar venturi is located at the discharge of an air conditioning unit to form a part of the unit and to stabilize flow. A plurality of sensor locations are provided in the diverging portion of the venturi such that a velocity sensor can be located in the sensor location appropriate for the highest range of sensor accuracy. The velocity is a measure of the volume flow which is the product of the cross section of the flow at the sensor location and the sensed velocity.

Abstract: A duplex compressor arrangement for shipboard application is provided with a central oil pickup to minimize the effects of trim on the sump. Additionally, the compressor crankcases are connected to the sump via return lines and equalizer lines which can act as secondary drain lines under the proper trim conditions.

Abstract: Pressure variation absorbing apparatus is mounted adjacent to a moving fluid stream in the diffuser of a centrifugal compressor for absorbing both acoustic and aerodynamic pressure variations. The absorbing apparatus when mounted as a part of the diffuser wall of a centrifugal compressor not only reduces acoustic noise but also absorbs aerodynamic pressure variations increasing the efficiency of the compressor and simultaneously reducing the rate of flow at which surge occurs thereby enlarging the operational flow range of the compressor. A method of absorbing pressure variations in a moving fluid stream is also disclosed.

Abstract: A waterbox for a shell and tube heat exchanger is disclosed. The waterbox is attached at one end of the heat exchanger to a tube sheet through which heat exchange tubes extend. Nozzle connections are made to the waterbox through a top member having an access opening which projects onto an area of the tube sheet through which the heat exchange tubes extend. The openings of the nozzles project onto areas on the tube sheet through which no heat exchange tubes extend. A removable cover is positioned over the access opening in the top member so that, when fluid flow conduits are connected to the nozzles on the top member, the conduits and removable cover are positioned relative to each other to allow removal of the cover without disturbing the connections between the conduits and the nozzles. In an alternative embodiment, the conduit connections are made through the back wall of the tube sheet rather than through the top member. This allows use of a waterbox with a removable top member having no nozzles.

Abstract: The occurrence of a condition indicative of an impending shutdown causes the closing of a switch which completes a circuit powering an indicator and a relay coil. The powering of the relay coil causes the closing of the associated contacts which completes a circuit for powering the relay coil independent of the initial closing of the switch so that the indicator remains powered/lit until manually disabled. The powering of the coil also results in the establishing of a summary fault signal. A timing relay is used to avoid false signals at start up.

Abstract: An indicator is provided for each of a number of preselected conditions and is actuated in response to the occurrence of the corresponding condition. The indicator remains actuated until manually reset even if the triggering condition no longer exists.

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: Apparatus for use in a heat exchange unit having wound fin tubing including a tube support assembly having a tube support and a rod for securing runs of wound fin tubing therebetween. The rod is mounted to the tube support in rod slots providing a snap fit arrangement. The entire tube support assembly is designed for use for mounting a peripherally encasing heat exchanger that is tapered to a vertical partition.

Abstract: A motor-compressor unit comprising a shell, a compressor, and a motor. The compressor includes a yoke and a slide block to transmit motion from a compressor crankshaft to a plurality of compressor pistons. The yoke includes left and right longitudinally extending side wall portions, and upper and lower front and rear connecting portions secured to and transversely extending between the left and right side wall portions. The upper and lower front connecting portions define a front transverse opening, and the upper and lower rear connecting portions define a rear transverse opening. The slide block is supported by the yoke for longitudinal sliding movement through the front and rear transverse openings.

Abstract: A method and apparatus for effecting capacity control of a compressor are described. A compressor having multiple capacity steps is utilized. A control valve being connected to both the compressor discharge pressure and the compressor suction pressure as well as heating and cooling pressure sensors is utilized. The control valve acts to connect appropriate pressure to the pressure sensors such that a variation in pressure level beyond a predetermined range effects a pressure sensor change indicating a need to change the capacity level of the compressor. Upon the capacity level of the compressor being changed the control valve is cycled to apply an opposite pressure level to the pressure sensor to reset the pressure sensor such that the pressure sensor may again detect a change in the pressure level to indicate a further need for a capacity change in the compressor.

Abstract: In a VAV terminal local control loop including a bellows controlled orifice in which the bellows inflation is controlled by a bleed thermostat, a signal is produced indicative of terminal satisfaction/dissatisfaction which can be used in controlling the air handler. Specifically, the position of the opening in the bleed plate is detected and compared with the position of the bleed plate permitting the maximum amount of conditional air to be supplied by the terminal to the zone. A signal indicating whether or not the bleed plate is in the maximum bleed position is generated which can be used to furnish information for controlling the air handler.

Abstract: A method and apparatus for evaluting the performance of a heat exchanger are described. Water is supplied to the heat exchanger at a known mass flow rate and temperature. The water is directed to traverse a flow path of the heat exchanger. The water is then heated and redirected into another flow path of the heat exchanger in heat exchange relation with the first flow path. The temperature change of the water over a flow path is measured to determine the performance of the heat exchange. The water flow rate and incoming water temperature may be fixed to make a single discharge temperature measurement sufficient to calculate heat exchager performance.

Abstract: A method and apparatus for achieving efficient utilization of the thermal energy generated by the indoor fan motor of an indoor unit of a reverse cycle air conditioning system is disclosed. A method is provided for dissipating the thermal energy of the fan motor to the indoor air stream when the heat exchanger is in the heating mode of operation and for dissipating such thermal energy to a heat sink when the indoor unit is operated in the cooling mode of operation such that the fan energy may either be added to the amount of heat energy being supplied to the enclosure or may be dissipated outside the enclosure such that it is not added to the cooling load of the enclosure when the system is operated in the cooling mode.

Abstract: A compressor and a method of assembling a compressor. The compressor comprises a central section, a cylinder head, and a suction muffler. The cylinder head of the compressor is secured to the central section thereof, and the cylinder head defines a muffler recess including a locking portion. The suction muffler extends into and is secured within the muffler recess in pressure engagement with the surfaces of the cylinder head defining the muffler recess. The suction muffler includes a locking flange extending into the locking portion of the muffler recess to limit movement of the suction muffler away from the cylinder head.

Abstract: A heat exchange unit is disclosed which is capable of being mounted either in a vertical or horizontal position. A condensate pan including multiple drain openings each serving a particular position is additionally disclosed. A cover plate secures the condensate pan by providing a drain projection opening into which a projection from the condensate pan may extend. A drip pan for coacting with the condensate pan is provided when the unit is mounted in the horizontal position.

Abstract: An assembly is provided for securing a pair of filter supports to support structure defined by the casing of an air handling unit and for selectively providing flanges for securing a duct to the casing. The filter support includes a filter channel having a channel portion for securing a filter and having a flange portion. The filter support may be mounted in a first position with the flange portion not extending beyond the end of the unit and in a second position with the flange portion extending beyond the end of the unit for promoting connections to a duct. Additionally, duct angles are provided having flanges extending therefrom. The duct angles are mounted to have the flanges extend inwardly when the filter channel does not extend beyond the unit and are mounted to extend outwardly to coact with the flange portions of the filter channels when it is desired to connect a duct to the unit.