Abstract: An air ventilation system. The system may comprise an air flow control box and a control module, wherein the air flow control box may comprise: a damper housing, ventilation cap, damper assembly, control arms, and damper motor. The damper housing may define a passage traversing from a proximal end to a distal end of the damper housing and may comprise a ventilation opening. The ventilation cap may be hingedly connected to the damper housing for selective movement between an open position and a closed position. The damper assembly may be in covering relation with the passage and may comprise damper blades that pivot together for selective movement between an open position and a closed position. The damper motor may actuate the selective movement of the ventilation cap and the plurality of damper blades via the control arms. The control module may actuate the damper motor of the air flow control box.

Abstract: A variable-frequency motor device that runs on alternating current includes a first converting circuit, a second converting circuit, and a DC variable-frequency motor. An operation module is coupled to the variable-frequency motor device, and provides the alternating current to the first or second converting circuit. The first converting circuit receives the alternating current, and generates a first rotation-speed signal. The second converting circuit receives the alternating current, and generates a second rotation-speed signal. The DC variable-frequency motor is driven at a rotation speed according to the first or second rotation-speed signal.

Abstract: An air-conditioning apparatus includes a temperature sensor for detecting a heat exchanger temperature or an inlet air temperature, a controller that performs variable control of the direction of the indoor unit air blow vane or the air flow speed or rate of the blower fan, and a remote controller that remote-controls indoor unit operation, wherein temperatures set via the remote controller are divided into two set temperature ranges and during heating operation the controller sets at least the air blow vane to a horizontal or downward direction on the basis of the two set temperature ranges and the heat exchanger temperature or the inlet air temperature.

Abstract: A programmable logic device (PLD) includes a plurality of logic array blocks (LAB's) connected by a PLD routing architecture. At least one LAB includes a logic element (LE) configurable to arithmetically combine a plurality of binary input signals in a plurality of stages. The LE comprises look-up table (LUT) logic having K inputs (a “K-LUT”). The K-LUT is configured to input the binary input signals at respective inputs of the K-LUT logic cell and to provide, at a plurality of outputs of the K-LUT logic cell, respective binary result signals indicative of at least two of the plurality of stages of the arithmetic combination of binary input signals. An input line network includes a network of input lines, the input lines configurable to receive input signals from the PLD routing architecture that represent the binary input signals and to provide the input signals to the K-LUT.

Abstract: A pellet stove utilizing gravity feed and natural draft more effectively and efficiently burns pellet fuel while producing less air pollution and ash. In one embodiment, the pellet stove has a primary combustion area comprising a burn unit removably disposed in the vent tube, a feed tube defining a fuel chamber above the burn unit and a secondary combustion area, comprising a burn box defining a secondary burn chamber, below the burn unit. The burn unit has a removable receptacle which defines a primary burn chamber that receives pellet fuel from the fuel chamber and discharges substantially burned fuel to the secondary burn chamber for additional burning. Openings in the burn box, pellet receptacle and vent tube draw air into the burn chambers. A control mechanism controls the air flow to regulate the heat generated by the pellet stove. The pellet stove can be manufactured in various aesthetically pleasing designs.

Abstract: An apparatus for extracting heat from a heat source comprising a housing having a first end with a first opening and a second end with a second opening. The housing includes an internal compartment therein and the first end of the housing is connected to said heat source. A channel extends from the housing for providing access to the internal compartment. A hollow conduit is positioned within the internal compartment extending between the first opening and the second opening. A plurality of members are positioned on an exterior surface of the conduit and along the length thereof. The members are able to absorb heat from within the conduit and release the absorbed heat into the internal compartment creating heated air. The apparatus includes a means for drawing air through and expelling air from said conduit and means for moving said heated air out from said internal compartment to a second compartment. The apparatus is activated via means connected to each of the drawing means and the moving means.

Abstract: To provide a logical operation circuit and a logical operation device which can performs a logical operation using a ferroelectric capacitor. The area ratio between the ferroelectric capacitors CF1 and CF2 are set such that the potential difference Vdef between voltages Va1 and Va0 is as large as possible, and a transistor MP has a threshold voltage Vth which is about ½·(Va0+Va1). Thus, the ON/OFF operation margin of the transistor MP can be significantly large. As a result, a reading process can be performed at a high speed without using an amplifying circuit such as a sense amplifier. Also, the logical operation circuit and the logical operation device can be highly integrated with ease since no sense amplifier is used.

Abstract: A fan coil controller for a hot and cold water system of a building that turns off the fan while the hot water and cold water coils are flushed. A fan coil control circuit is configured to periodically and temporarily operate a hot water flow control circuit and a cold water flow control circuit to cause a flushing of the hot and cold water system and simultaneously provide a signal to a fan control circuit to prevent the thermostat enabling the fan during flushing of the hot and cold water system.

Abstract: A balanced building ventilation system that employs a fireplace as an element of the ventilation system. The fireplace includes a firebox, and an exhaust gas flue is connected to the firebox for exhausting gas from the firebox to the outdoor ambient. A ventilation channel conveys outdoor ambient air into the building interior. A motor-driven draft inducer is connected to the exhaust gas flue for forcing exhaust gas flow out to the outdoor ambient. A motor-driven blower is provided for forcing ventilation airflow through the channel to replace building interior air lost to exhaust gas flow.

Abstract: In an electrical load controller, a thermal fuse is blown at an abnormal heating of an electrical load, so that an electrical circuit of the electrical load is disconnected. The controller controls a work amount of the electrical load by intermittently controlling electrical power to be supplied thereto. The power supply to the electrical load is intermittently stopped even when the work amount of the electrical load is controlled at a maximum amount. Therefore, an arc, generated when the thermal fuse is blown, disappears while the power supply is stopped, so that the thermal fuse can be accurately operated.

Abstract: The present invention is a voltage adapter for a low voltage thermostat which permits the following input voltage ranges:100-132 VAC/50 or 60 Hz,200-264 VAC/50 or 60 Hz, and265-330 VAC/50 or 60 Hzmaintaining an output of at or just effectively about 24 VAC.

Abstract: In an arrangement of a vehicle auxiliary heater with an integrated regulating device in the region of the floor in the vehicle cab and a control unit remote from the auxiliary heater, e.g. in the region of the dashboard or on an inner wall of the vehicle, it is proposed that the control unit be operationally connected to the regulation device wirelessly via a bidirectional radio link in which use is made of an r.f. unit with a first r.f. module on the operating side with a transmission and reception section and a second r.f. module on the control device side with a second transmission and a reception section. This obviates the need for the complicated laying of prior art wired connections between the control unit and the regulating device of the auxiliary vehicle heater, making the heater particularly suitable for subsequent fitting in commercial vehicles.

Abstract: An air conditioner for a vehicle has a heat pump type refrigerant circuit capable of operating at least in a heating mode. The air conditioner comprises a motor fan for supplying air heated by a heat exchanger to the interior of the vehicle during operation of the heating mode, a sensor for detecting the temperature of the air at a position downstream of the heat exchanger and a control unit for controlling the volume of the air supplied by the motor fan to a predetermined minimum volume by controlling the drive of the motor fan when the detected air temperature is lower than a predetermined temperature. Even in a condition where a sufficiently large heat radiation from the heat exchanger cannot be expected, a large volume of cold air that has been insufficiently heated can be prevented from being discharged into the interior of the vehicle.

Abstract: An air conditioner is provided and includes a louver which is provided at a blowing opening. The louver is moved rotationally from above to below or from below to above by a variable speed mechanism. At the time of heating, a louver rotational speed while the louver is moved rotationally in a range of a blowing angle .theta..sub.1 is set to a speed .omega..sub.1 within a vortices generation area relative to a wind velocity of blowing air flow. Also, a louver rotational speed while the louver is moved rotationally over the blowing angle .theta..sub.1 is set to a speed .omega..sub.1 within a vortices non-generation area relative to the wind velocity of blowing air flow. Thereby, at the time of heating, downward reach of warm air in a room while the louver is moved rotationally below the predetermined blowing angle and a temperature diffusibility while the louver is moved rotationally above the predetermined blowing angle are improved.

Abstract: An electronic thermostat having high and low voltage control capability and varied functional capabilities. The thermostat is particularly suited for use with fan coil heating and cooling units. Specifically the thermostat uses relays to actuate external devices such as heating and cooling equipment, fans and dampers. The use of relays permits control voltages for these external devices to be different (e.g. 24 VAC, 208-230 VAC or 277 VAC).

Abstract: An air conditioning apparatus comprising an indoor unit. The unit has a first indoor heat exchanger for cooling or heating indoor air and a second indoor heat exchanger for cooling or heating indoor air. A first indoor fan is located near the first indoor heat exchanger, for drawing the indoor air and supplying it through the first indoor heat exchanger to the zone of a room. A second indoor fan is located near the second indoor heat exchanger, for drawing the indoor air and supplying it through the second indoor heat exchanger to the zone of a room. The apparatus further comprises two temperature sensors for detecting the temperatures of the indoor heat exchangers, respectively. The higher or lower of the temperatures detected by the sensors is selected, in accordance with the cooling or heating mode in which the apparatus is operating. In accordance with the temperature selected, the air-supplying rates of the indoor fans are controlled.

Abstract: A thermostat capable of accommodating primary and secondary loads is taught. Preferably a hydronic valve actuator is the primary load and a fan coil of variable speed is the secondary load. Temperature sensing is electronic and both heating and cooling as well as multiple fan modes are accommodated.

Abstract: A controller for unit ventilators which include processing means having associated memory that enables control schemes to be used. The controller is modular and compact in its construction, is easily installed in existing unit ventilators and provides not only the controlled pneumatic pressure in the output lines for the controller, but also provides electrical control signals for controlling the operation of the fan. The controller is adapted to control unit ventilators having auxiliary radiation and is also adapted to control ASHRAE cycle 3 type installations.

Abstract: The apparatus of the present invention comprises a hydronic distribution system using prefabricated, flexible cable containing plastic tubing to provide liquid supply and return conduits for the hydronic system. The plastic conduits are enclosed in a foam thermal insulation material which is encased in a flexible, moisture impervious shell. In an alternate embodiment of the invention, the flexible cable includes electrical conductors for supplying power to a fan and for carrying an electrical control signal from a thermostat. The flexible cable thus described can be installed in a building easily and quickly in a manner similar to that currently used for electrical cable.

Abstract: A controller having two cascaded PID control loops in the control of unit ventilators of the type which have a heating coil, a fan, and a damper for admitting outside air into a room in which the unit ventilator is located. The controller utilizes the sensed room temperature and a room temperature set point to generate a set point for the temperature of the air being discharged from the unit ventilator, and utilizes the discharge temperature set point and the sensed discharge temperature to control the damper position and the operation of the heating coils of the unit ventilator.

Abstract: A refrigeration cycle comprising a compressor and an outdoor heat exchanger, both of which are arranged outside a room to be air-conditioned, to communicate with an indoor heat exchanger and a radiant heat exchanger, both of which are arranged inside the room, and are operated simultaneously in a heating operation mode. A fan delivers air to the indoor heat exchanger. A temperature sensor detects the temperature of the radiant heat exchanger. A controller controls the indoor heat exchanger fan speed so as to control the radiant heat temperature from the radiant heat exchanger in accordance with a temperature detection signal from the sensor.

Abstract: An air conditioning apparatus comprises a plurality of outlet ports, a blowing fan for blowing off an conditioned air from the outlet ports to the outside of the main body of the apparatus, an air directing plate arranged in at least one of the outlet ports to enable the direction of the conditioned air to change, an operation state detecting device for detecting the operation state of the main body, and a driving device for adjusting the position of the air directing plate, depending on signals from the operation state detecting device.

Abstract: A separate air conditioner includes a heat exchanger, an upper fan, a lower fan, the first air flow control for controlling the upper and lower fans in an initial heating period such that the ratio of an upper air flow from the upper fan to a total air flow from both the upper and lower fans decreases as the total air flow increases; and the second air flow control for controlling the upper and lower fans in a stable heating state such that the ratio increases as the total air flow increases. The first air flow control controls the upper and lower fans in a cooling operation such that the upper air flow is inversely proportional to the total air flow, while the second air flow control controls the upper and lower fans in a heating operation such that the upper air flow is proportional to the total air flow.

Abstract: In an air flow control device for an air conditioner including a heat exchanger arranged so as to face an inlet port, and upper and lower air-blowing fans disposed in upper and lower outlet ports, respectively, wherein air sucked through the inlet port and the heat exchanger is directed to the fans, there are further provided input producing means for outputting a condition required for the outlet air from the outlet ports and phenomenon information on the outlet air, upper and lower fan operation mode determining means for determining the operation modes depending on the output signals from the input producing means, upper and lower fan operation mode control means for controlling the operation of both fans at the operation mode according to the commands from the operation mode determining means, and control means for optimizing the outlet air to a user.

Abstract: An air supply and conditioning system 10 is provided having a constant speed air blower 26 whose output is controlled by a thermostatic throttle and check valve 28. The throttle and check valve provides a minimum air flow below a minimum ambient temperature, provides a maximum air flow above a maximum temperature, and provides a roughly linearly increasing flow from the minimum to the maximum ambient temperature. The air blower draws air through a pair of nuclear and biological contamination filters 22 from the ambient and impels the air through an air conditioning portion 14 and a pressurization door 42.

Abstract: A temperature sensitive duty cycling control switch is mounted to a forced air ductless gas or oil heater by a special mounting bracket. The bracket attaches to the front of the heater in the path of the heated airflow. The mounting device is basically a tapered conduit or duct which is held at a distance from the heater so that it does not unduly obstruct the airflow and is tapered to concentrate air generated by the heater onto a plate mounted in front of the duct. The duty cycling control switch is then mounted to this plate and responds to the temperature of the plate. This enables the cycling of the heater burner while the fan continues to operate.

Abstract: Radiator housing assembly, for a hydronic baseboard heater for heating a room or area, forming a part of an overall building or zone heating system having a master thermostat, said assembly having a damper which is positionable between open and closed positions in a controlled manner to regulate the flow of heated ambient air therethrough. The damper is adapted for automatic electrical positioning in response to a remote control device, such as an adjustable thermostat in the room or area to be heated in order to maintain the room or area at a predetermined desired temperature at or lower than the temperature setting on the master thermostat, thereby conserving energy.

Abstract: A temperature sensitive duty cycling control switch is mounted to a forced air ductless gas or oil heater by a special mounting bracket. The bracket attaches to the front of the heater in the path of the heated airflow. The mounting device is basically a tapered conduit or duct which is held at a distance from the heater so that it does not unduly obstruct the airflow and is tapered to concentrate air generated by the heater onto a plate mounted in front of the duct. The duty cycling control switch is then mounted to this plate and responds to the temperature of the plate. This enables the cycling of the heater burner while the fan continues to operate.

Abstract: An air conditioner comprising temperature detectors for respectively detecting air temperatures at suction and discharge sides, a fan motor whose rotational speed is controllable, a motor driven wind directing plate, and a control section for controlling the discharge angle by the wind directing plate and for controlling the air flow amount by the fan motor. Thus, the air flow amount and the discharge angle are controlled by the control section to heat a room such that the heating operation is effected with a small amount of warmed air of a high temperature immediately after the start of operation, and the amount of warmed air is gradually increased and the discharge angle is also gradually changed as the room temperature rises.

Abstract: A controller for a fan motor of an air conditioner in a vehicle according to the present invention is constructed to control the magnitude of a stream of air sent from an electric fan into a room of the vehicle so that the magnitude of a stream of air is reduced when a temperature of the outside air of the room falls down below a predetermined temperature in the heating mode of the air conditioner.

Abstract: In an air conditioning system for automobiles including a temperature control apparatus having temperature setting device for setting a vehicle compartment temperature, a temperature sensing device for sensing an actual vehicle compartment temperature, a temperature difference signal device for generating a difference signal in accordance with a difference between the set vehicle compartment temperature and the sensed actual vehicle compartment temperature, and air flow control device for controlling the rate of air flow from a blower so as to provide varying air flow rates up to a maximum air flow rate in accordance with the value of the difference signal, a detecting device for detecting that the air condition system is at a heating operation, and a control arrangement responsive to the output from the detecting device and the value of the difference signal for controlling the air flow rate control device so that the rate of air flow from the blower is maintained at a predetermined flow rate which is less t

Abstract: A water valve is disclosed for use in passenger vehicle heating systems. The valve includes a cylindrical metallic socket having a heat accepting surface portion connected to the valve housing and in fluid communication with fluid flowing through the valve. The position of the heat accepting surface portion relative to a rotatable butterfly valve member results in a vortex flow condition across the face of the heat accepting surface portion, thereby providing fast heat transfer from the fluid to the socket.

Abstract: An apparatus for controlling the air conditioning of a vehicle in accordance with the operational condition of said vehicle, the state of air conditioning of the passenger compartment of said vehicle and the relationships among the passenger compartment temperature, the atmospheric temperature and a command value of the passenger compartment temperature.

Abstract: A temperature responsive blower control attachment for a wood-burning stove. The attachment is mountable to or seatable on a heated external surface of the stove and provides thermostatically regulated operation of an electrically operated blower or fan that circulates air heated by the stove. Temperature is sensed through an element which is in contact with the heated surface of the stove, but the other circuit elements of the attachment are isolated from and are not subjected to the potentially damaging temperature of the stove surface.

Abstract: A flue gas heat recovery system includes a heat exchanger fluidly interposed between a furnace and a chimney to receive hot flue gas from the furnace. The heat exchanger is releasably mounted in the chimney and includes a partition which forces air being heated by the heat exchanger to traverse a path through the heat exchanger which maximizes the time of contact between that air and the heat exchanger heating elements. The partition further creates turbulence in the heat air.

Abstract: A system for recovering and utilizing, to a controlled and variable extent, waste heat from a coolant fluid. The amount of heat recovery varies in proportion to the marginal costs associated therewith. Heat laden coolant passes through an interior heat exchanger where heat may be extracted in varying amounts from the coolant by a thermostatically-controlled air mover, the air mover admitting outside air past the interior heat exchanger. The coolant proceeds to an exterior wet surface heat exchanger where residual heat is concurrently extracted from the coolant by a thermostatically-controlled combination of ambient air, recirculated ambient air, and water spray. The coolant then returns to the beginning of its cycle. The temperature of outside air is the principal variable determining the proportion of heat recovered by the interior heat exchanger and the proportion extracted by the exterior heat exchanger. The total heat extracted reduces the coolant temperature to a predetermined operating level.

Abstract: The "Fireplace Heater Unit" conveys fireplace heat to the atmosphere through the means of hot water and steam. Steam pressure build-up is controlled by a regulator that releases steam through a nozzle at the proper pressure. This controlled steam is put to work turning a simple turbine which transmits to a fan (blower) and a pulley.

Abstract: A method of maximizing available but unused heated air located in the plenum of a furnace which comprises sensing the point at which air within the furnace plenum is sufficiently warm to provide valuable hot air but is still below the activation temperature of the furnace blower and displacing said warmed air into the air flow paths for a room air space, and continuing said displacement after the furnace blower has shut down until the air within the plenum reaches the point at which it no longer has valuable heating capacity. The device is a heat sensitive thermostatically controlled unit which comprises a small horsepower, low energy consumption air displacement motor. Associated therewith is an air deflector for directing displaced air into the air paths for a room air space and also associated therewith is an air temperature sensing switching means for stopping and starting the motor in response to sensed temperatures within the plenum of a furnace.

Abstract: A portable forced air unit having a housing provided with an air driving element arranged between an air inlet and an air outlet, the air outlet feeding the forced air beneath a fixed room heat exchanger e.g. baseboard or convector heater with which the unit is designed to operate. Thermostats, responsive to the temperature of the room in which the unit is operating and the temperature of the heat exchanger, serve to control the air driving element.

Abstract: A heat collector and diffuser is disclosed for superimposition over elongated fin tube radiators in building heating systems. Blower means induces airflow across an elongated fin tube heat exchanger and into collector ducts which channel the heated air into a diffuser area where the blower means forcefully discharges the heated air into the roomer space. In this manner, inefficient and out-of-date heating systems may be improved and modernized without substantial changes or modifications.

Abstract: An air distribution system supplies conditioned air to at least one zone to be conditioned and comprises a supply duct connected with a diffuser discharging into the conditioned zone. A modulating valve in the supply duct is provided with a bellows actuator for regulating the flow of air into the zone and a secondary conditioning apparatus such as a heater is provided in the supply duct for warming the air before introduction into the zone. The control system for the bellows actuator and for the secondary conditioning apparatus is of the fluidic type with power for the actuator and control system supplied from a total pressure pick-up in the duct. A thermostat for supplying temperature responsive fluidic signals to the bellows and control system is provided with manual adjustments for setting the minimum and maximum flow rates of conditioned air into the zone.