Abstract: An apparatus for detecting a head wind in a gas boiler and method is disclosed which is capable of the magnitude of variation of voltage corresponding to the R.P.M. of an exhaust fan and the combustion state of flame. A microcomputer in the gas boiler detects the R.P.M of exhaust fan and voltage applied to the exhaust fan when the R.P.M exceeds a normal limit. The detected voltage is compared with a reference voltage. If the compared result exceeds a predetermined value, to sense the combustion state of flame an infrared rays sensor is used. When the head wind is introduced into an exhaust conduit, the red wavelength is sensed at flame due to incomplete combustion. Accordingly, in case that the magnitude of variation of voltage exceeds a predetermined value and the red wavelength is sensed, microcomputer can detect the head wind.

Abstract: A self-regulating forced-air heater includes a housing in which is located an air passageway. A blower forces air through the air passageway, including into and out of a combustion chamber. A burner disposed within the combustion chamber combusts a fuel and air mixture to heat the air exiting of the combustion chamber. A venturi effect is used to draw the fuel and air mixture through the burner and into the combustion chamber. An adjustable venturi plate assembly is positioned between the blower and the burner, and expands or contracts in surface area to increasingly or decreasingly block the center of the air passageway. A control assembly includes an electronically controlled valve, an electronic controller, an electrical actuator, and a temperature sensor. The electronic controller monitors the temperature sensor, determines if an adjustment is needed in heat output, and in response thereto, adjusts the temperature of the air exiting the self-regulating forced-air heater.

Abstract: A mobile or modular home hot air heating and humidifying system including a counter-flow furnace having a base pan and a housing resting on the base pan and containing a heat exchanger and a blower located above the heat exchanger for directing air downwardly within the housing in heat exchange relation to the heat exchanger and to and through an air outlet opening in the base pan. A humidifier unit resting on the floor below the furnace and structurally supporting the furnace defines a passageway communicating with the air outlet and with a feeder duct which extends downwardly through the floor and connects to a heat distribution duct system below the floor. The humidifier operates in response to operation of the blower. A method for installing a humidifier unit in an existing heating system of the aforedescribed general type is also disclosed.

Abstract: The invention relates to an air heating device with a hot air fan located in a housing to deliver hot air from an air inlet opening which is located on the face side via a heat exchanger to a hot air exit opening located on the opposite face.The object of the invention is to devise an air heating device which can always intake a sufficient amount of hot air regardless of its installation position without additional parts.This object is achieved by the fact that the housing near the face air inlet opening on its outside periphery on at least one side has additional air inlet openings.

Abstract: A compact, non-polluting, extremely energy-efficient, through-the-wall vented forced hot air heater, which humidifies and cleans said hot air without any additional equipment or water supply, comprises a rotating cylindrical heat and moisture transport/storage element which has many substantially identical axially parallel flow passages and very large transfer surface per mass, a means for controllably transferring the heat and the moisture from the combustion products to said rotating element and then to said hot air stream counter-currently, and a means for preventing formation of air pollutants.

Abstract: A pocket heat exchanger comprises an elongated combustion chamber that defines a plane passing through the combustion chamber longitudinal axis. A two-pass, three-pass, or four-pass duct system is arranged symmetrically about the plane to conduct hot products of combustion produced in the combustion chamber in parallel paths to a flue. The pocket heat exchanger is installable as a modular unit into the pocket of a recirculatory fluid system. The symmetrical design of the pocket heat exchanger assures that a stream of recirculating gas flowing past the pocket heat exchanger is heated to have a uniform temperature across its cross section. A shroud partially surrounding the combustion chamber and the duct system aids in directing the recirculating gas to thoroughly scrub the combustion chamber for maximum heat transfer to and temperature uniformity of the stream of gas. The flue for the products of combustion may pass through the stream of recirculating gas, or it may pass outside the stream of the gas.

Abstract: A heat exchanger for a multi oil furnace is disclosed wherein the external cabinet shell houses a central ventilation chamber divided into inlet and outlet sides by a generally vertical barrier. Combustion gases flow from the burner chamber into an upper bank of conduits and a lower bank of conduits, all of which pass horizontally through the ventilation chamber. Headers operably coupling the burner chamber, the upper and lower banks of conduits and a discharge opening define a flow path for the combustion gases created by the ignition of the used oil within the burner chamber. By positioning the burner chamber vertically between the upper and lower banks of conduits, the ambient ventilation air must pass over the burner chamber and the upper and lower banks of conduits twice while passing through the ventilation chamber, thereby providing a 360 degree loop of heat exchange.

Abstract: A multi oil furnace is disclosed wherein the front door is sealable against the burner chamber and against a lip extending around the circumference of a front header formed in the cabinet shell to operatively interconnect an upper bank of heat exchanger conduits with a lower bank of heat exchanger conduits. The exhaust gases flow from the burner chamber into the upper bank of conduits to the front header where the exhaust gases must flow around the burner chamber to the lower bank of heat exchanger conduits. The lip extending around the periphery of the front header is recessed below the lower bank of conduits to permit an accumulation of ash precipitated from the exhaust gases. The front door carries longitudinally offset sealing surfaces to seal against both the burner chamber and the header lip. Both the upper and lower banks of conduits, the burner chamber and the front header are accessible through the opening corresponding to the front door when moved to its opened position.

Abstract: A fuel burning furnace includes a number of energy efficient features. The furnace includes a heat exchanger in which combustion air is preheated by hot discharge gases. Diverters are provided in the heat exchanger to continually urge hot combustion gases toward the interior portions of the heat exchanger to improve its heat transfer characteristics. The furnace incorporates a number of features to determine malfunction and indicate inefficient operation. A humidification control system for the humidification or dehumidification of circulated air also is provided. The furnace also includes a blower motor system which compensates for loss of tension in driving belts and makes correction for blower speed in response to temperature variations.

Abstract: A method of connecting a heat exchanger to a forced air furnace is described. Firstly, connect a valve to the hot exhaust gas outlet of a furnace. The valve has a generally "L" shaped valve body. The valve body includes a primary passage. A diversion passage intersects the primary passage. A diversion return port intersects the primary passage downstream of the diversion passage. A butterfly valve member is pivotally mounted at the intersection of the primary passage and the diversion passage. The valve member has a first wing and a second wing. The valve has an open position and a closed position. The valve member is normally in the open position. Secondly, connect a fresh air outlet of a heat exchanger to a fresh air inlet on the furnace.

Abstract: A forced air furnace has its blower mounted on a blower shelf beneath the heat exchanger, by screws that enter aligned clearance holes in the blower mounting flanges and blower shelf and which engage gripper holes in a bottom lip of the vertical cell panel that serves as the proximal wall of the furnace heat exchanger cell. This provides vertical support for the blower and absorbs stresses from up-and-down motion.

Abstract: A pair of sealing skirts join the inducer to the collector box of a condenser induction furnace, and accommodate offset in positions of the inducer inlet opening and the collector box outlet port. The two mating skirts are congruent and of generally triangular shape. A ridge or lip of one fits a groove on the other to form an airtight gasketless seal.

Abstract: Provided is a hot-air type heater including a heat generating means such as a burner heater from which hot air is produced and blown out the heater into a living room so as to warm up the inside of the room with a uniform temperature distribution even among various heating rate conditions. The hot-air heater includes at least of variable angle louvers which are vertically swingable, and a control means for swinging the louver in association with at least either a hot air flow rate at a hot air outlet opening of the heater or the heating value of the heat generating means, so that the louver is vertically swung in accordance with an output from the control means in order to minimize differences in temperature distribution in the room during operation of the heater under various heating conditions.

Abstract: A direct gas-fired heating and ventilating system for industrial and commercial buildings and the like comprises a direct gas-fired burner, fresh air dampers, fresh air bypass dampers and recirculation dampers.

Abstract: A jet blower having a housing, a cylindrical chamber, a blower wheel in the chamber, four tangential passageways from said chamber, the passageways terminating in axially-directed nozzles and a Venturi foil surrounding each nozzle.

Abstract: A direct-fired make-up furnace comprises a cabinet which houses an air blower. A gas fired burner located in a sloped passage, which is formed by walls of a return air compartment and a by-pass air compartment, radiates heat at an angle relative to the blower. The return air compartment substantially blocks direct radiation of the burner. An exit opening of the by-pass air compartment is located between the burner and the blower.

Abstract: A jacketed wood burning stove of the type having an inner firebox door and an outer jacket door in front of the firebox door and wherein a flash inhibitor is provided consisting of a relatively small auxiliary firebox door which is manually biased open but is held closed by an engaging bracket on the outer jacket door when the outer jacket door is closed.

Abstract: A boiler having a downdraft solid fuel firebox with a refractory hearth structure with a plurality of parallel internal conduits forming an internal combustion chamber, a heat exchanger below the firebox connected to the outlet of the internal combustion chamber, an outlet blower connected to the outlet of the heat exchanger and an air inlet valve controllable with the outlet blower to control the induction of air through the boiler for automatic boiler control.

Abstract: An improvement of the space heating system delivering a composite comprising of heated outdoor air, unheated outdoor air and recirculated indoor air into a building to counter a natural infiltration of outdoor air by modulating the composite air supply delivered to the interior of a building.

Abstract: A system for installation on aircraft to serve trays containing precooked food to passengers, the food-loaded trays being placed in the aircraft in the cold state and being heated to a service temperature level. The system includes a locker adapted to accommodate a bank of open-end racks, each having a stack of trays therein separated by air spaces, the front ends of the racks facing the door of the locker. Behind the racks is a hot air modulator in the form of a shallow box having a broad, continuously driven tape therein, the front course of the advancing tape facing the rear ends of the racks through windows in the box which register with these ends. The tape has endless trains of holes punched therein, each train lying in a plane intersecting a respective air space between trays in the stacks. Air drawn from the free region between the front door of the locker and the front ends of the racks is caused by a blower to pass through a heater station.

Abstract: A portable unit for heating packages containing pre-cooked cold food, the unit acting to rapidly heat up the food to a service temperature level and to thereafter maintain this level. The unit includes a case having a rack therein divided by shelves into a series of compartments, each adapted to receive a food package. Standing vertically behind the rack is an air modulator including a stationary outer tube having a series of longitudinally-aligned ports communicating with the respective compartments. Rotating within the outer tube is an inner tube having a series of angularly-displaced holes which successively register with the ports in the course of a rotary cycle. Air drawn from the free region in the front of the rack is conveyed through a heater station and from there blown into the inner tube to create a pressure differential between the free region and the inner tube.

Abstract: A counter-top reheating unit for packages containing pre-cooked meals which are initially in a frozen state, the unit acting to quickly raise the temperature of the meals to a service temperature level and to maintain the meals at this level for an indefinite period. The unit includes a box-like case having telescoped therein an open-fronted inner box whose walls are spaced from those of the case to define rear and side air spaces therebetween. Mounted within the inner box is a compartment to receive a stack of packages with spacings therebetween. The perforated wall of the compartment is spaced from the rear of the inner box to define a rear plenum.

Abstract: A method for converting a direct fired gas heating apparatus from one having a constant volume discharge air flow characteristics to one having variable volume characteristics by the use of an internally recirculating volume discharge air flow increment.

Abstract: A jacketed wood burning stove of the type having an inner firebox door and an outer jacket door in front of the firebox door and wherein a flash inhibitor is provided consisting of a relatively small auxiliary firebox door which is manually biased open but is held closed by an engaging bracket on the outer jacket door when the outer jacket door is closed.

Abstract: A gas burning furnace system is disclosed, including a blower which draws air from outside the home for combustion. The blower forces combustion air to the gas burner via a pressure box situated between the blower and the burner. The pressure box encloses a barrier having an adjustable aperture therein, through which the combustion air must pass before reaching the burner. By adjusting the size of the aperture, the rate of supply of combustion air to the burner can be regulated so as to produce complete fuel combustion without cooling the firebox.

Abstract: A forced air furnace includes a conventional fuel fired, primary heat exchanger and a secondary heat exchanger associated with the stack. The secondary exchanger includes a phase change material having a transition temperature within the range of the stack temperature, and which is disposed in heat exchange relation with the flue gases flowing through the stack. The secondary exchanger also includes duct means for conveying the circulated air in heat exchange relation with the phase change material; and the flow path through the secondary exchanger is an alternative path controlled by a damper. When the primary exchanger is turned on, the phase change material in the secondary exchanger is charged from the flue gases of the primary exchanger. When the phase change material is in condition to release stored heat, a temperature responsive control shuts off the primary exchanger and diverts the circulated air through the secondary exchanger.

Abstract: A furnace having a nitrogen-heat separator comprised of a heat absorbing mass, such as cast iron plates, containing passages through which products of combustion can pass and deposit heat into the metal mass to thereafter be extracted and utilized, a baffle for directing products of combustion through the nitrogen-heat separator, a fiberglass cloth heat-retaining curtain for blocking the furnace exit and trapping heat inside the furnace when fuel combustion stops, a fan for extracting the stored heat from the nitrogen-heat separator when combustion stops and circulating it throughout the furnace interior.