Abstract: A method for controlling an operation of a refrigeration appliance includes controlling a first cooling routine for a first compartment via a flow of a thermal exchange media to a first evaporator. The method further includes controlling a heating routine in response to a setpoint temperature being greater than the temperature of the first compartment. The heating routine includes activating a heating element and a fan in the first compartment over a first interval and deactivating the heating element and the fan over a second interval. The heating routine continues by activating the first interval and the second interval over alternating time periods. In response to the temperature of the first compartment being greater than or equal to a target temperature associated with the setpoint, the method may control the operation of the appliance by returning to the cooling routine.

Abstract: A method of using a storage and cooking device having multiple thermal containers includes disposing a first food item in a first thermal container, a second food item in a second thermal container, and a third food item in a third thermal container. A volume of fluid is cooled and circulated through at least a portion of the device such that thermal energy from at least one of the first, second, or third food item is transferred to the cooled fluid. The device is transitioned from a first operating mode to a second operating mode in response to a criterion being satisfied. When in the second configuration, the volume of fluid is heated and circulated through at least a portion of the device such that thermal energy is transferred from the volume of fluid to at least one of the first, second, or third food item.

Abstract: A cooker including: an inner pot; a cooling system coupled to the inner pot for cooling the inner pot; a heating system coupled to the inner pot for heating the pot; and a processor configured to control the cooling system and the heating system according to a programmed sequence.

Abstract: An apparatus for heating gas utilizes a series of chambers through which a gas volume is advanced, and a gradational heat transfer element which enables incremental heat transfer to the gas volume as the gas volume is advanced through the chambers.

Abstract: The present invention aims to reduce noise derived from an operation sound of a fan while maintaining cooling capacity of the fan. A cooling system includes a fan which is disposed in a chassis in which a CPU which is exemplified as a heating element is housed, one temperature sensor which is disposed in the chassis, another temperature sensor which is disposed at a position which is different from a position of the one temperature sensor, and a fan control unit which drives the fan in a case where one temperature, which is based on a measured value of one temperature sensor, is at least a first threshold value or in a case where another temperature, which is based on a measured value of the other temperature sensor, is at least a second threshold value which is set to a value lower than the first threshold value.

Abstract: A domestic appliance for cooling and heating food items and/or beverage items may include a shell, a door, a cooling compartment defined at least in part by the shell and the door, the compartment being configured store the food items and/or the beverage items in a cooled environment and at least one solid state heating element inside of the cooling compartment, the at least one solid state heating element configured to emit infrared radiation to heat at least one of the food items and/or the beverage items without heating the surroundings or other contents of the cooling compartment.

Abstract: A method of displaying a battery life for a warming cart battery is provided. The method includes the steps of detecting with a processor that a warming cart battery voltage is out of range of a predetermined threshold, determining with a processor an operation state of each of a plurality of periphery warming cart devices, and automatically setting a battery scale of a warming cart battery based on which of the plurality of periphery warming cart devices are in an active operation state.

Abstract: A mold for forming a wind turbine blade is formed in two halves, each half 1a comprising a sandwich structure of a perforated outer layer, an inner aluminum honeycomb structure and an inner impermeable heat-conducting layer. An article in the form of a mat of glass fiber impregnated with epoxy resin is placed in the mold. A supply chamber 6 supplies heated pressurized air to the mold which passes into the honeycomb core of the mold through the perforated outer layer, and back through the outer layer into two exhaust chambers 7. A row of supply conduits 13 and exhaust conduits 16 connect the exhaust chambers 7 to the supply chamber 6. The air in each conduit 13, 16 is heated by a respective heat exchanger 18 supplied with heated water 9. The heated air cures the epoxy resin, and the mold is then cooled by supplying cold water to the heat exchangers 18, which, in turn cools the air supplied to the mold.

Abstract: The invention relates to a process and to a unit for chemical looping oxidation-reduction combustion of a hydrocarbon feed, wherein heat exchanges are controlled through a level variation of a dense fluidized bed of active mass particles in an external heat exchanger (E1, E2), positioned on a transport line carrying particles circulating between a reduction zone (210) and an oxidation zone (200) for the particles in the chemical loop. The bed level variation is allowed through controlled application of a pressure drop on a fluidization gas outlet in the heat exchanger, said pressure drop being compensated by the level variation of an active mass particle bed in a reservoir zone provided on the particle circuit in the chemical loop.

Abstract: A decontamination system (10), including: a plurality of interconnected and insulated panels (18) configured to form walls (14) and a roof (16) and to define an interior (24) of an enclosure (12) configured to enclose a transportation asset; a humidifying module (30) in fluid communication with the interior of the enclosure and configured to raise a temperature and a humidity of the interior of the enclosure to a predetermined temperature level and a predetermined humidity level for a timed duration; and a dehumidifying module (50) in fluid communication with the interior of the enclosure and configured to lower the temperature and the humidity of the interior of the enclosure from the predetermined temperature level and the predetermined humidity level to ambient levels.

Abstract: A method for testing thermal fatigue resistance of a shear cutter includes: engaging the shear cutter with a rotating target cylinder; moving the shear cutter along the rotating target cylinder until the shear cutter is heated to a threshold temperature; cooling the shear cutter in response to heating of the shear cutter to the threshold temperature; and repeating the heating and cooling of the shear cutter.

Abstract: There is provided a method of controlling aerosol production in an aerosol-generating device, the device comprising: a heater comprising at least one heating element configured to heat an aerosol-forming substrate; and a power source for providing power to the heating element, comprising the steps of: controlling the power provided to the heating element such that in a first phase power is provided such that the temperature of the heating element increases from an initial temperature to a first temperature, in a second phase power is provided such that the temperature of the heating element drops below the first temperature and in a third phase power is provided such that the temperature of the heating element increases again. Increasing the temperature of the heating element during a final phase of the heating process reduces or prevents the reduction in aerosol delivery over time.

Abstract: In exemplary embodiments, HVAC controls and corresponding error detection methods are disclosed. In an exemplary embodiment, an HVAC control generally includes a digital input configured to receive a digital signal, an analog input configured to receive an analog signal, and an error indicator. The control is configured to receive a neutral signal at the analog input, determine a voltage of the neutral signal with respect to earth ground, and operate the error indicator to indicate a normal state if the voltage is below a first threshold, a bad ground state if the voltage is between the first threshold and a second threshold, and a reverse polarity state if the voltage is above the second threshold.

Abstract: A vehicle climate control system. An air conditioner and heater are operatively connected to a controller and control the temperature of the cabin area of a vehicle. A processor, operatively connected to the controller, determines the amount of time for an operator of the vehicle to travel between their location and the location of the vehicle. The processor determines an amount of time required to adjust the temperature of the cabin area of the vehicle to a selected temperature by using one of the air conditioner and the heater. The processor automatically operates one of the air conditioner and the heater to begin adjusting the temperature of the cabin area to the selected temperature when the amount of time required for the operator to travel between their location and the location of the vehicle is less than or equal to the amount of time required to adjust the temperature of the cabin area vehicle to the selected temperature.

Abstract: An HVAC controller, a method of starting a HVAC unit and a HVAC system are disclosed herein. In one embodiment, the HVAC controller includes: (1) an interface configured to receive a delay originating signal and (2) a processor configured to automatically generate an offset delay value for the HVAC unit upon receipt of the delay originating signal and delay starting identified components of the HVAC unit based on the offset delay value.

Abstract: An integrated efficient fan controller circuit device for controlling a fan of a heating, ventilating and air conditioning (HVAC) system, comprising an input-output port, a voltage regulator, a microprocessor, and a transistor wherein the transistor turns on the microprocessor that sends a trigger signal to the gate of a triac which controls the fan of an HVAC system to switch OFF the HVAC fan operation when the thermostat fan output is in float or unknown state. The proposed circuit avoids the floating state of the thermostat fan output and keeps the HVAC fan either in ON state or in OFF state. The transistor acts as a switch and the collector of the transistor is connected to the input terminal of microprocessor which controls the triac operation. The microprocessor measures the real time temperature of the system and controls the operation of the HVAC fan. The present invention handles the switching OFF of the HVAC fan operation when the thermostat fan is switched to OFF.

Abstract: A method for energy saving during the operation of an HVAC system comprising an energy saving unit, comprising: installing a temperature probe in the supply air that can send data to the energy saving unit; configuring the energy saving unit to perform a set of functions comprising: receiving a user's instructions for turning on the HVAC system and setting a target room temperature; shutting off the heater or compressor when the target temperature is reached; measuring the temperature of the air in the room that is being heated or cooled and comparing the temperature of the supply air with the temperature of the air in the room; and causing the blower to keep running after shutting off the heater or compressor for as long as the temperature of the air in the room is smaller or greater than the temperature of the supply air, respectively.

Abstract: An electric machine includes a stator. The stator includes a stator core, and a plurality of windings supported by the stator core. The plurality of windings include a first end turn portion and a second end turn portion. An adaptable cooling system is fluidically connected to the housing. The adaptable cooling system includes a first coolant circuit configured to guide a coolant in a heat exchange relationship with the stator core, and a second coolant circuit configured to guide a coolant in a heat exchange relationship with one of the first and second end turn portions. A thermal control module is operably connected to the adaptable cooling system.

Abstract: A method includes predicting, using a predicted flow of heat into an area, a quantity of energy used by a chiller to maintain a temperature of the area at a desired temperature during each of a first plurality of time periods of a chilling cycle. A set point of the chiller is automatically during the chilling cycle using the predicted quantity of energy.

Abstract: A method of controlling airflow through a grille on a front end of a vehicle comprising the steps of: detecting vehicle operating conditions; determining a desired percentage of airflow through the grille based on the desired operating conditions; actuating grille airflow shutters to an open position for the determined desired percentage of a predetermined time interval; and actuating the grille airflow shutter to a closed position for a remaining percentage of the predetermined time interval.

Abstract: A control system for providing thermal management of electronic equipment housed in a cabinet enclosure. The system can include a plurality of sensors in proximity to the cabinet enclosure for monitoring a temperature, a pressure and a humidity associated with the electronic equipment; and a controller in communication with the sensors for receiving data from the sensors, where the controller adjusts the temperature, the pressure and the humidity associated with the electronic equipment.

Abstract: A centralized-monitoring apparatus, which centralized monitors a device including a storage, a temperature sensor to detect a temperature therein, and a temperature-variable device to cool or heat inside the storage such that the temperature reaches a set object-preservation temperature, comprises: an input device to be input with first information indicative of a time zone in which the temperature-variable device performing power-saving operation and second information indicative of a set temperature of the time zone; a storage device to store the first-and-second information from the input device; a timing device to measure a current time; and a control device to control the temperature-variable device, based on the first-and-second information and current time, so as to start operation of turning the temperature to the set temperature when the current time reaches a starting time of the time zone, and terminate the operation when the current time reaches an ending time thereof.

Abstract: An air conditioning system using deep seawater, includes: a pump device pumping the deep seawater; a seawater-coolant heat exchanger performing heat exchange between a cold energy in the deep seawater and a coolant; an air conditioning heat exchanger performing heat exchange with the coolant cooled by the cold energy to release the cold energy in a target facility for cooling; a coolant circulating system circulating the coolant between the seawater-coolant heat exchanger and the air conditioning heat exchanger; and a controller driving the pump at timing when a variation is anticipated in the predicted heat loads based on the predicted heat load of the facility predicted from a prediction value of an operation status of the facility and a prediction value of a weather status at the place of the facilitate and a time lag due to a length of the pipe in the coolant circulating system.

Abstract: An energy-efficient hot water supply apparatus comprises a control assembly and a controller. The control assembly is disposed between an external energy supply source and a heating apparatus, so as to control turning on/off of energy supply of the energy supply source to the heating apparatus. At least one activation switch is disposed on the controller. The activation switch can operate the control assembly to cut off the entry of the energy of the energy supply source to the heating apparatus and keeps a fixed off duration.

Abstract: A method of at least in part temperature-independently controlling a thermostatically-controllable cooling and/or heating appliance is provided. The method comprises the step of periodically at least in part temperature-independently deactivating and reactivating a thermostatically-controllable cooling and/or heating element of the said appliance whilst the cooling and/or heating element of the cooling and/or heating appliance is ordinarily energised to heat and/or cool during an energisation period of a or each standard duty cycle. A deactivation period of the cooling and/or heating element is at least in part controlled by a timer element. The deactivation period is also automatically adjustable based on a deactivation-period profile associated with the timer element, and the deactivation period is further automatically adjustable when the cooling and/or heating element is thermostatically or manually deactivated during the energisation period of the or each said standard duty cycle.

Abstract: Systems and methods are described for controlling fan-only cooling duration following normal air conditioning operation. Following normal AC cooling, economical fan cooling is used. The duration of the fan cooling period is adjusted based on temperature measurements made during the previous cooling cycle that ended with fan cooling. An expected temperature drop to be provided by fan cooling as well as an expected time to achieve that drop is calculated based on prior measurements. The expected values are then used improve fan cooling for subsequent cooling cycles. In some cases, fan cooling is not initiated unless: (1) a time limit has an elapsed, such that sufficient condensation is allowed to form on the evaporator coil during the first phase, and (2) indoor relative humidity is below a predetermined threshold.

Abstract: A whole house ventilation control system is disclosed for a house HVAC system including a thermostat, supply and return air plenums and an HVAC fan. The thermostat selectively controls the HVAC system to maintain the desired temperature and resulting in a variable operating cycle period between successive on times. A fresh air intake duct is between an exterior intake vent and the return air plenum. A stale air exhaust duct is between the return air plenum and an exterior exhaust vent. The control system comprises a controllable intake damper in the fresh air intake duct and a controllable exhaust damper in the stale air exhaust duct. A controller is operatively connected to the house HVAC fan and the controllable dampers. The controller stores a desired fresh air exchange rate and is further adapted to predict an upcoming cycle period for a next successive operating cycle and calculating a fresh air vent timer responsive to the desired fresh air exchange rate and the predicted upcoming cycle period.

Abstract: Method of thermal management of a building, on the basis of a thermal system equipped with a low-power generator, characterized in that it comprises a step (E3) of turning on the generator ahead of time in the absence of any occupant in the building so as to comply with a future comfort setpoint at a future instant (H), by taking account of the energy available (Egenerator—H) at the generator up until this future instant (H) and of the energy necessary (Eheating—H) to reach the future comfort setpoint within the building at this future instant (H).

Abstract: The present invention relates to improvements in or relating to cooling, in particular for cooling beverages in containers such as cans or bottles. We describe a cooling apparatus having a cavity for receipt of a product to be cooled; rotation means to rotate a product received in the cavity and cooling liquid supply means to provide a cooling liquid to the cavity. The rotation means is adapted to rotate the product at a rotational speed of 90 revolutions per minute or more and is also adapted to provide a pulsed or non-continuous rotation for a predetermined period.

Abstract: A thermostat, includes a housing and an occupancy sensor that is disposed within the housing and configured to detect physical presences of users within a responsive area of the occupancy sensor. The thermostat may also include a processing system that is disposed within the housing and in operative communication with the occupancy sensor. The processing system may be configured to determine, after a trial period, whether to activate an away-state feature by storing indications of how often the occupancy sensor detected physical presences during the trial period, computing an occupancy level for the trial period, comparing the occupancy level to a threshold criterion, determining whether sufficiently true indications of occupancy conditions were sensed by the occupancy sensor during the trial period, and enabling the away-state feature of the thermostat if it is determined that the sufficiently true indications of occupancy conditions were sensed during the trial period.

Abstract: The invention relates to a method for regulating a cooling device fitted in or to a switchgear cabinet, by means of a regulating device, wherein the temperature of the switchgear cabinet interior air is detected and an interior fan assigned thereto for generating an interior air flow through an evaporator and providing cooling air is switched on if the detected temperature of the switchgear cabinet interior air exceeds an upper setpoint temperature, and is switched off if the detected temperature falls below a lower setpoint temperature, and the invention relates to an apparatus for carrying out the method.

Abstract: Systems and methods for managing a programmable thermostat are described herein. One or more system embodiments include a programmable thermostat having a first management profile; a data acquisition subsystem; and a data analysis subsystem. The data acquisition subsystem is configured to receive thermostat data from the programmable thermostat, and the data analysis subsystem is configured to receive the thermostat data from the data acquisition subsystem, and determine a second management profile for the programmable thermostat based, at least in part, on the thermostat data.

Abstract: An arrangement for use in connection with an air handling unit includes a controller and a processing circuit. The controller is configured to control a device within an air handler unit, which includes at least a first coil. The processing circuit is configured to receive first information representative of a maximum liquid flow rate through the first coil and second information representative of a maximum air flow rate of the first coil. The processing circuit is further configured to generate a time constant estimate, based on the first information and second information, for use in the controller in performing control of the device.

Abstract: Mobile devices are re-supplied with fluids on a periodic basis thereby eliminating the need to maintain a permanent connection between an external fluid supply and the moving device. Electronic scanning devices generate heat and operate at varying and high temperature conditions that interfere with operations of the scanner heads. Circulating a heat transfer fluid through the sensor head removes excess heat from heat sensitive regions of the sensor head during operations. Once the heat transfer fluid reaches a predetermined temperature or after passage of a predetermined length of time, the scanner head is maneuvered to a docking station where it is coupled to an external heat fluid source where fresh fluid is supplied to the scanner head.

Abstract: A controller for a variable heating system is operable to control a stepper motor operated gas valve to adjust gas flow to vary the heating level. The controller includes a first terminal for receiving a thermostat signal requesting heating, an electronic memory, and a microprocessor in communication with the electronic memory and first terminal. The microprocessor detects a thermostat signal requesting heating, and generates a control signal for the stepper motor to operate the gas valve. The microprocessor includes a programmable read-only-memory encoded with an instruction to store a time duration during which the microprocessor detects a thermostat signal requesting heating, and further encoded with an instruction operable to determine a predetermined heating level based on the stored time duration. The microprocessor responds to a thermostat signal requesting heating by determining the number of steps the motor must move to vary the gas flow corresponding to the predetermined heating level.

Abstract: The invention comprises systems and methods for ramping setpoints on thermostats controlling HVAC systems. At least one thermostat is located inside a structure and is used to control an HVAC system in the structure. At least one remote processor is in communication with said thermostat and at least one database stores data reported by the thermostat. At least one processor compares the outside temperature at least one location and at least one point in time to information reported to the remote processor from the thermostat. The remote processor ramps the setpoint on the thermostat so as to reduce the average spread between inside temperature and outside temperature in order to reduce energy consumption with affecting comfort. The remote processor takes into account the effect of weather conditions and occupant preferences in determining whether and when to ramp setpoints.

Abstract: A brazing fin material for heat exchangers includes a core material and a filler metal clad on each side of the core material, wherein the core material is an aluminum alloy including manganese, the filler metal is an aluminum alloy including 6 to 9.5 mass % of silicon, silicon particles in the filler metal have an average circle equivalent diameter of 3 ?m or less, and the brazing fin material has a thickness of 0.06 mm or less.

Abstract: A post-exposure baking apparatus comprising a supporting member, a heating member, and a cooling member is disclosed. A wafer is disposed on the supporting member and a photoresist layer is formed on the wafer. The heating member comprises electrical heating wires and is adapted to apply heat to the wafer to chemically amplify an acid generated in the photoresist layer through an exposure process using deep ultraviolet light. The cooling member is adapted to cool an outer edge of the wafer to suppress the amplification of the acid at the outer edge of the wafer.

Abstract: An energy management system for managing energy such as power consumed in a building in an optimal state to significantly save energy is provided. A computer control system (200) for controlling the energy management system performs program control as follows. Current date and time are acquired, a control pattern for that time is obtained using a control program, so as to determine whether operation of an air conditioner (186) is to be turned ON or OFF, and then output either an operation instruction or a stop instruction. A control signal is then output from a digital output unit (212) to the air conditioner (186). Thus, the air conditioner (186) temporarily stops operation according to a predetermined pattern for the program control. The current operating state is displayed on a display unit (240) and a remote monitoring unit (270).

Abstract: A centralized-monitoring apparatus, which centralized monitors a device including a storage, a temperature sensor to detect a temperature therein, and a temperature-variable device to cool or heat inside the storage such that the temperature reaches a set object-preservation temperature, comprises: an input device to be input with first information indicative of a time zone in which the temperature-variable device performing power-saving operation and second information indicative of a set temperature of the time zone; a storage device to store the first-and-second information from the input device; a timing device to measure a current time; and a control device to control the temperature-variable device, based on the first-and-second information and current time, so as to start operation of turning the temperature to the set temperature when the current time reaches a starting time of the time zone, and terminate the operation when the current time reaches an ending time thereof.

Abstract: A controller for a two-stage heat source is provide, which may be connected to either a single stage or a two-stage thermostat to provide low stage heating for a variable time period before switching to high stage heating. The controller includes at least a first terminal for receiving a signal requesting heating from a single-stage thermostat or a two-stage thermostat connected to the first terminal. A microcontroller in communication with the first terminal determines a duty cycle value for a heating cycle based on the duration in which a signal at the first terminal is present relative to the duration of the heating cycle. The microcontroller determines a low stage time limit from the duty cycle, and provides low stage heating when a signal is present at the first terminal for a time period not more than the time limit, and switches to high stage heating after the time limit.

Abstract: Circuits, methods, and systems are directed to controlling the amount and polarity of current to multiple loads with switches, where the loads share switching components. The loads may be thermoelectric elements, which heat or cool based on the state of the switches. The switches may be run in a single mode during a duty cycle, or multiple successive modes during the duty cycle to achieve full control of the loads.

Abstract: A method of cooling a plurality of devices operated in parallel and heated by relatively long duration pulses using a single coolant flow channel to the devices in series that transports the heat from the several devices in a contiguous series of heat pulses to the heat exchanger.

Abstract: A recuperator for transferring thermal energy from a warm gas flow to a cold gas flow, comprising: a first group of ducts with a first connection and a second connection; a second group of ducts with a third connection and a fourth connection, wherein the ducts of both groups extend mutually parallel; a first supply for supplying the cold gas flow to the first connection; a first discharge for discharging the cold gas flow from the second connection; a second supply for supplying the warm gas flow to the third connection; and a second discharge for discharging the warm gas flow from the fourth connection. The device provides temporarily and repeatedly alternating connections from the first supply to the fourth connection; the first discharge to the third connection; the second supply to the second connection; and the second discharge to the first connection.

Abstract: A fluid circulating apparatus for warming or cooling a surface includes a pressurized fluid source operative to circulate fluid through a conduit such that a supply fluid moves from a supply port of the fluid source into a first end of the conduit, through the conduit, and from a second end of the conduit to a return port of the fluid supply. A flow control when in a forward mode directs fluid from the supply port into the first end of the conduit and from the second end of the conduit to the return port, and when in a reverse mode directs fluid from the supply port into the second end of the conduit and from the first end of the conduit to the return port. A mode selector is operative to switch the flow control between forward mode and reverse mode.

Abstract: A heat transfer system comprising a primary heat exchanger for receiving heat from a heat source; a secondary heat exchanger for exhausting heat to a heat sink; a conduit connecting the primary heat exchanger and the secondary heat exchanger; and an electrokinetic pump for pumping a heat exchange fluid between the primary heat exchanger and the secondary heat exchanger through the conduit.

Abstract: An apparatus and method for modifying the temperature and aromatically conditioning the air and surfaces within a bed environment. In preferred embodiments, the invention is a self-contained, forced air bed warmer or bed warmer/cooler and aromatic infuser which pre-heats, pre-cools and infuses aromatic influences into the interior sheets and covers of a bed to provide a controlled micro-environment that facilitates relaxation into restful sleep on cold or hot nights.

Abstract: A method for controlling flow rates of outdoor air supplied to a room and room air discharged to an outside of the room in ventilation. The method of the present invention includes the steps of supplying outdoor air drawn through an air supply duct to a room at a first flow rate, and discharging room air drawn through an air discharge duct to an outside of the room at a second flow rate higher than the first flow rate. The first and second flow rates vary with rotation speeds of fans respectively mounted on an air supply duct and an air discharge duct.

Abstract: The present invention controls a room temperature by controlling an environmental control unit. A total span about a setpoint temperature is adjusted in accordance with a previous total span and a multiplicative factor. The multiplicative factor is periodically updated from a desired cycle time and a previous cycle time. The room temperature may also be controlled by adjusting a duty cycle for controlling an environmental control unit. The duty cycle is adjusted based on an error associated with a previous control cycle and an attenuation factor. A new control cycle may be started by cutting the previous control cycle or a current control cycle may be extended if a predetermined condition is detected. The control mode is selected based on environmental characteristics and room characteristics. The control mode may include a span control mode and a duty cycle control mode that is selected from the cycle rate.

Abstract: A heating or cooling system, such as an HVAC system, of variable output has a number of control elements and may include a variable speed compressor, a variable speed combustion (induced or forced draft) blower motor; a variable speed circulator blower motor; a variable output gas valve or gas/air premix unit; and a controller specifically developed for variable output applications. The system may utilize a pressure sensor to determine the actual flow of combustion airflow in response to actual space conditions, vary the speed of the inducer blower, and subsequently vary the gas valve output to supply the correct amount of gas to the burner system. A temperature sensor may be located in the discharge air stream of the conditioned air to provide an input signal for the circulator blower.