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| Number | Title | Issue Date |
| 5024379 | Variable capacity heating appliance A heating system with a hot water coil is provided with a variable speed blower whose speed is regulated in response to a sensed load in the system. Heat can therefore be added to the hot water by way of a simple burner system, with the required control b... | 06/18/1991 |
| 5016706 | Heat exchanger tube support Support for the heat exchanger tubes of a gas-fired, year round air conditioning unit are provided by a pair of interlocking, wire frame elements that sandwich the tubes therebetween and are, in turn, securely attached to the frame structure. The two elem... | 05/21/1991 |
| 5010742 | Actuation mechanism for vent and exhaust doors The indoor blower scroll structure includes integrally formed vent and exhaust port walls with associated doors attached thereto. A single actuator mechanism is also attached to the scroll structure and is mechanically linked to both doors to thereby prov... | 04/30/1991 |
| 5007499 | Silencer for a centrifugal compressor A silencer device is installed into the discharge pipe of a centrifugal compressor by first installing a channel shaped frame in the discharge pipe and then sliding the silencer device into the frame to be contained for operational use. The orientation an... | 04/16/1991 |
| 5004047 | Header for a tube-in-tube heat exchanger A header for a tube-in-tube heat exchanger is formed in a single piece such that the manifold plate in one end thereof is integrally formed with the header body. Such a design eliminates the process of brazing the manifold plate into the header body, thus... | 04/02/1991 |
| 4997340 | Balance piston and seal arrangement A labyrinth seal is provided to isolate the transmission from a balance piston of a centrifugal compressor, the labyrinth seal being pressurized with refrigerant vapor from the motor chamber, which vapor is at a pressure slightly above that in the transmi... | 03/05/1991 |
| 4984431 | High efficiency purge system In order to enhance the efficiency of removing refrigerant from the mixture of non-condensable gases in a purge recovery system, a carbon filter is placed in the flow of mixed gases from the purge chamber such that any remaining refrigerant can be absorbe... | 01/15/1991 |
| 4979559 | Stacking support brackets Provision is made for stacking one condenser on another by mounting apparatus which includes a channel for receiving and supporting the existing feet at the base of the upper unit, and a clip member for securing the combination to the lower edge of the lo... | 12/25/1990 |
| 4962749 | Method of operating a natural gas furnace with propane In a gas furnace designed for operation with natural gas, the use of propane as a fuel is facilitated by increasing the inducer speed by a factor which is obtained by comparing the higher inducer speed necessary to bring down the heat exchanger temperatur... | 10/16/1990 |
| 4951870 | Overtemperature control A blower motor failure is detected by a sensor/switch that opens at a first preset temperature level and automatically resets for the next cycle. The occurrences of such openings per thermostat cycle are counted and when they reach a predetermined number,... | 08/28/1990 |
| 4945982 | Wire raceway A wire raceway member, for containing the wires which extend between a fan motor and its separate control module, is formed of a lower U-shaped portion and an upper expandable portion. An opening in the expandable portion is normally smaller than the diam... | 08/07/1990 |
| 4946096 | Method and apparatus for operating a furnace from a 12V DC battery A furnace which normally operates from a residential AC power source is adapted to operate on auxiliary DC power by changing the normal control function to substantially prevent the furnace from operating in the high heat mode during periods of auxiliary ... | 08/07/1990 |
| 4938664 | Oil reclaim system In a centrifugal compressor having an ejector for reclaiming the oil which tends to accumulate in a lower portion of the suction housing, the ejector high pressure line is provided with its inlet at the bottom of the collector such that, in addition to pr... | 07/03/1990 |
| 4936101 | Fan arrangement for thru-the-wall unit In an air conditioning system having the outdoor coil disposed in a wall opening with the outdoor air being required to flow horizontally inwardly pass through the coil and then flow horizontally outwardly as it is discharged, the propeller fan is placed ... | 06/26/1990 |
| 4922726 | Heat pump system A heat pump system communicating water from a remote source for heat exchange with a localized refrigerant loop including compressor and evaporator elements, said refrigerant loop further linked to a blower for additional heat exchange with respect to sel... | 05/08/1990 |
| 4911234 | Heat exchanger coil with restricted airflow accessibility An outdoor heat exchanger coil has a fan on one side thereof for forcing ambient air through the coil and a partition on the other side thereof. The partition is placed relatively close to the coil to thereby define a channel which allows the flow of ambi... | 03/27/1990 |
| 4899726 | Furnace inducer outlet elbow The elbow between the discharge end of the draft inducer and a horizontal vent pipe is provided with a well structure on the lower side of its discharge end such that condensate forming in the vent pipe is prevented from passing through the elbow into the... | 02/13/1990 |
| 4896411 | Method of making a multiple cell condensing heat exchanger A gas fired condensing furnace comprising a multiple cell condensing heat exchanger is provided wherein each condensing heat exchanger cell has a condensing flow passage of serpentine shape formed from a single flat sheet metal blank. The condensing heat ... | 01/30/1990 |
| 4891004 | Control of energy use in a furnace A microprocessor control determines, in the course of initiating a heating cycle, whether the blower is operating in the continuous mode, and if it is, the control prompts the blower to be turned off prior to the ignitor being turned on. In this way, the ... | 01/02/1990 |
| 4887767 | Limit switch control method for a two-stage furnace A two-stage gas furnace control system automatically shifts into a high fire only mode if, in two consecutive low fire heating cycles a limit switch is tripped to indicate that a gas valve is stuck in a high fire condition. In this way, continued operatio... | 12/19/1989 |
| 4882913 | Slide plate economizer An economizer has a single sliding door which leads to the indoor section from both the outdoor air inlet and the return air inlet, with the two inlets being separated by a divider baffle. The sliding plate is movable from its fully closed position, where... | 11/28/1989 |
| 4873838 | Refrigerant metering in a variable flow system In a refrigeration system having a compressor driven by a variable speed motor, the refrigerant flow volume through the expansion device is controlled by way of a solenoid driven piston which alternately opens and closes the orifice, with the duty cycle o... | 10/17/1989 |
| 4856295 | Security lock for a room air conditioner A sliding lock mechanism is mounted behind the front wall of the chassis, and associated openings are provided in the front and side walls of the chassis to respectively provide operator access to the lock mechanism and allow it to be reciprocally moved s... | 08/15/1989 |
| 4850852 | Gas valve shut off method and apparatus Provision is made for sensing when the gas valve relay contacts are welded, or stuck, in the closed position and for responsively turning off the inducer motor when that occurs. This in turn causes the pressure switch to open to thereby cut off the power ... | 07/25/1989 |
| 4844690 | Diffuser vane seal for a centrifugal compressor In a centrifugal machine for a refrigeration or air conditioning system and including a casing, an impeller, a variable width diffuser assembly leading from the impeller, and a plurality of vanes received through respective complementary-shaped openings i... | 07/04/1989 |
| 4835984 | Evaporator condensate pan with integral trap An evaporator condensate pan has a condensate trap incorporated therein to thereby eliminate the need for the installation of the separate component. A well structure is provided in the bottom wall of the condensate pan and an additional depending wall st... | 06/06/1989 |
| 4815524 | Control system for a furnace operating in the continuous blower mode A furnace having the capability of operating its blower continuously is provided with means for automatically shutting off the blower at the beginning of a heating cycle and for resuming the operation thereof only after a predetermined time has elapsed to... | 03/28/1989 |
| 4811570 | Sleeve assembly with attached duct and drain connections for a through the wall air conditioning unit A sleeve assembly and an air conditioning unit are disclosed for mounting the air conditioning unit in a through the wall application. The sleeve assembly includes duct connections, drain connections and electrical connections such that during constructio... | 03/14/1989 |
| 4800735 | Fan motor assembly method and apparatus for a room air conditioner The intermediate partition of a room air conditioner is provided with a downwardly extending slot in its upper edge such that installation and removal of the motor, with its attached fans, can be easily accomplished without removal of the partition. A fil... | 01/31/1989 |
| 4796436 | Heat pump charging A method of controllably charging a heat pump system with refrigerant until adequately charged for the cooling mode of operation, including checking the outdoor ambient temperature, injecting sufficient refrigerant to sustain safe compressor operation, op... | 01/10/1989 |
| 4792089 | Self-correcting microprocessor control system and method for a furnace A self-correcting control system and method is provided for a furnace to correct certain operating conditions that exceed normal limits. Upon sensing insufficient air flow as a function of the pressure drop across the heat exchangers, the control system a... | 12/20/1988 |
| 4789330 | Gas furnace control system The control system of an induced draft furnace includes a provision for turning on the inducer motor when a flame is sensed outside of the normal sequence of a heating operation. In particular, if the thermostat is in the off position when a flame is sens... | 12/06/1988 |
| 4777870 | Adjustable air sweep mechanism for a room air conditioner The discharge air sweep mechanism for an air conditioner is provided with slippage in its drive linkage such that the position of the vanes can be manually adjusted when the drive motor is turned off, or if the vanes become jammed during normal air sweep ... | 10/18/1988 |
| 4773232 | Adjustable fan motor mount for a room air conditioner The fan drive motor mount of a room air conditioner is mounted on the base pan with the edge of one U-shaped member fastened directly to the base pan and with the side walls of the other U-shaped member partially overlapping the side walls of the first me... | 09/27/1988 |
| 4763964 | Sliding door assembly A control panel door is mounted to the front grille panel of an air conditioning system in such a way as to allow it to be opened by first pivoting it to an oblique position and then sliding it to a position behind the front grille panel. Provision is mad... | 08/16/1988 |
| 4760707 | Thermo-charger for multiplex air conditioning system A subcooler is provided in heat exchange relationship with the high pressure liquid refrigerant line flowing to the indoor coil, such that when a low pressure condition is sensed on the low pressure side of the system, the subcooler flashes a portion of t... | 08/02/1988 |
| 4751825 | Defrost control for variable speed heat pumps An adaptive defrost system for a heat pump wherein the time-between-defrosts is continuously updated by multiplying the last time-between-defrosts by a ratio of the desired and actual differences between the pre-defrost and after-defrost saturated coil te... | 06/21/1988 |
| 4748828 | Self-draining base pan for an air conditioner The base pan of a heat pump has a plurality of drainage openings formed near the periphery thereof such that either a single row coil or a multiple row coil heat exchanger may be used therewith to obtain adequate drainage of defrost liquid while at the sa... | 06/07/1988 |
| 4748827 | Coil support structure Vertical support for the coil within a base pan is provided by way of a plurality of raised support surfaces that are formed to define on the radially outward side an opening that facilitates the inwardly extending fastener which secures the protective gr... | 06/07/1988 |
| 4748822 | Speed control of a variable speed air conditioning system Provision is made in a multiple zone air conditioning system for varying the speed of the compressor to match the load thereon. The differences between the actual temperatures and the set points in the individual zones are monitored and the largest of the... | 06/07/1988 |
