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7455238 |
Control system and method for multistage air conditioning system
A controller and method for operating an HVAC system including an air conditioning unit, such as a gas furnace, having three stages of heat output and responsive to signals from a single stage or...
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7322532 |
Hot-water supply apparatus, anti-freezing method thereof, and anti-freezing program thereof
A hot-water supply apparatus is an apparatus which has a primary heat exchanger absorbing sensible heat of combustion exhaust and a secondary heat exchanger absorbing latent heat of the combustion...
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7296426 |
Interactive control system for an HVAC system
An interactive system for controlling the operation of an HVAC system is provide that comprises a thermostat for initiating the operation of the HVAC system in either a full capacity mode of...
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7293718 |
Variable output heating and cooling control
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...
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7225995 |
Space heating and cooling
An air handler operates alternately in (a) a heating state at times when air in a space in a building is at an actual temperature that is insufficient relative to a set temperature and (b) a...
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7104460 |
Method and controller for determining carbon dioxide emissions from a recirculating air heater
A method of determining the amount of air flowing through an outside air damper of a recirculating air heater includes the steps of sensing an amount of airflow flowing through the damper,...
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7048537 |
Apparatus and method for controlling a variable fuel fired appliance
An apparatus is provided for controlling a fuel fired heating appliance, the apparatus comprising a first processor for controlling the ignition operation of the furnace and a second processor for...
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6986469 |
Method and apparatus for energy recovery in an environmental control system
Control apparatus for an environmental control system comprises input circuitry receiving environmental information and output circuitry for controlling an HVAC system. Processing circuitry in the...
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6925999 |
Multistage warm air furnace with single stage thermostat and return air sensor and method of operating same
A multistage furnace for heating residential or commercial spaces is operated by a single stage thermostat and a return air temperature sensor providing sensed temperature information to a...
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6848623 |
Method and apparatus for centrally controlling environmental characteristics of multiple air systems
The present invention provides a system and single controller for receiving constant and individualized information from a plurality of air control systems. A single controller is capable of...
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6758208 |
Flexible gas-fired heat exchanger system
A compact, highly flexible and efficient, multi-positionable, multi-dimensional and multi-stage gas-fired heat exchanger system as described. The system is connectable in a forced air duct...
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6719207 |
Microprocessor controlled two stage furnace
An air comfort control device is disclosed, which has a furnace with a furnace fan, an air conditioner with an air conditioner fan positioned remote from the furnace fan, and a temperature...
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6695046 |
Variable speed fan motor control for forced air heating/cooling system
A fan motor speed control system for controlling the fan motor speed of an air conditioning system includes a power output circuit including a power triac which is turned on and off by an...
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6439466 |
Climate control system
A climate control system includes an air evacuation and ventilation system thereof operable to withdraw air from an outflow air duct system and ventilate the withdrawn air to the outside prior to...
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6431457 |
Air heater control
A heater control system is operable to modulate a heater of a building or warehouse or the like, in order to maintain the temperature rise of air passing through the heater at or below a maximum...
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6321744 |
Modulating furnace having a low stage with an improved fuel utilization efficiency
An improved, induced-draft, gas-fired furnace which is adapted to operate at any of a high, medium and low firing rate. A pressure sensing assembly generates differential pressure signals that vary...
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6308702 |
Compact high-efficiency air heater
A compact high efficient air heater providing improved comfort regulation. The air heater includes a cross-flow type heat exchanger formed from a plurality of stacked corrugated plates which define...
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6283115 |
Modulating furnace having improved low stage characteristics
An improved, induced-draft, gas-fired furnace which is adapted to operate at any of a high, medium and low firing rate. A pressure sensing assembly generates differential pressure signals that vary...
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6244515 |
Universal two stage gas furnace ignition control apparatus and method
A gas furnace control for two stage gas furnaces which can be used with either a single stage or a two stage room thermostat monitors the length of time the first, low combustion, stage is...
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6230979 |
Controller for two-stage heat source, usable with single and two stage thermostats
A controller for a two-stage heat source that can be used with a single stage or a two stage thermostat. The controller includes a second stage delay timer that initiates second stage heating when...
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6206084 |
Circuit arrangement for actuating an air-conditioning system or automatic air conditioner in a vehicle
A circuit arrangement for actuating an air-conditioning system or an automatic air conditioner in a vehicle, in which it is possible to switch the air-conditioning system or automatic air...
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6161535 |
Method and apparatus for preventing cold spot corrosion in induced-draft gas-fired furnaces
A method and apparatus for increasing the circulating airflow of induced-draft, gas-fired multi-stage furnaces without creating conditions that result in cold spot corrosion therein. Control...
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6089221 |
Space heater
A space heater for heating air from within a room with a heat exchanger connected to a burner and discharging heated air into the room has a room temperature sensor for detecting a room temperature...
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6000622 |
Automatic control of air delivery in forced air furnaces
A forced air furnace circulation fan controller adjusts the speed of the circulation fan according to the incidence of air delivery restrictions. Upon detecting insufficient air delivery as a...
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5984003 |
System and method for controlling operation of a multi-speed circulation blower in a heating and cooling apparatus
In a heating system, when a high limit opens a predetermined number of times in a single call for heat by the thermostat, the system provides for operating the circulator blower at the cool speed...
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5971284 |
Apparatus for regulating heater cycles to improve forced-air heating system efficiency
A method and apparatus of regulating cycles of a burner in a forced air heating system. A control unit uses a sensor at an output of a heat exchanger to make measurements of a temperature of air...
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5860473 |
Multi-zone automatic changeover heating, cooling and ventilating control system
A climate control system having a control means for receiving cool call signals and heat call signals from a plurality of thermostats. The control means blocking action by conflicting calls when...
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5829261 |
Driving arrangement for air refrigeration appliances
A driving arrangement for air refrigeration appliances, of the type comprising a fan (F), a compressor (C), a thermostat (T) and first and second selecting devices (10, 20), which are manually...
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5819845 |
Temperature control method for a heating/cooling system
A temperature control method and apparatus therefor controls an air temperature in a room by determining an error temperature between a set temperature and an actual room temperature. An auxiliary...
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5806760 |
Furnace controller useable, without modification, with either a single or two stage thermostat
An electronic two stage furnace controller may be used interchangeably, without modification thereof, with either a single or two stage thermostat to regulate the heating and cooling operation of a...
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5718372 |
Temperature controller
A supplementary thermal system controller for assisting a main system controller in retaining a desired temperature rise by monitoring the temperature in the return duct, wherein the supplemental...
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5676196 |
Dual energy saver for air conditioning
An attachment unit (28) to an existing central air conditioning thermostat controller (24) like the ones found in most homes and offices; which provides two independent modes of saving energy,...
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5636786 |
High efficiency gas furnace
A high efficiency gas furnace utilizes a unique pre-mixed design in combination with a pressurized/high velocity combustion process. The combustion process occurs in a combustion chamber and the...
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5590642 |
Control methods and apparatus for gas-fired combustors
A control system for a fluid-fuel burner, such as a furnace for an HVAC system. The furnace has a variable flow of fuel into the burner. In addition, the circulating air blower is also variable....
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5582233 |
Air circulation enhancement system
In a forced air heating and cooling system including a blower fan for circulating air in an air ambient use-space, a timer circuit and a power output control circuit for augmenting control and for...
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5492273 |
Heating ventilating and/or air conditioning system having a variable speed indoor blower motor
A system which drives an indoor blower of a heating, ventilating, and/or air conditioning (HVAC) system in response to a system control signal. The system control signal has a BLOWER DEMAND state...
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5433377 |
Interlock and forced air furnace and HRV
An electrical interlock ties a heat recover ventilator to circulation air blower operation of an associated forced-air furnace or air conditioning system. This ensure that the blower circulates...
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5377909 |
Limit switch control especially for warm air furnaces
A control system to control the operation of a furnace (10) having a fuel control unit (26) to supply fuel to a burner (24) includes a limit switch (48) within furnace (10) to detect an overheated...
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5341986 |
Control circuit and device for humidifying air in a heating system
A humidification system for use with a heating unit to modify and maintain a predetermined level of humidity in an enclosed space using a pulse circuit for energizing a solenoid valve to allow...
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5326026 |
Energy and peak-load conserving thermostat and method with controlled deadband
A thermostat is disclosed for controlling a heating system, particularly a forced hot-air furnace, so as to improve fuel efficiency and decrease peak fuel load. The thermostat controls the length...
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5326025 |
Warm up method for two stage furnace
A two-stage furnace is operable at a high fire full rate mode and at a low fire partial rate mode when there is a call for high heat or low heat, respectively. In order for the furnace to be less...
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5316073 |
Twinning control
A twinning controller or control circuit for use in an HVAC system is coupled between a system thermostat and at least two HVAC units coupled to a common duct. The HVAC units are heating, cooling...
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5307990 |
Adaptive forced warm air furnace using analog temperature and pressure sensors
Furnace control for a forced air furnace utilized in multi-zone heating. The forced air furnace is made up of return ducts, a heat exchanger, warm air ducts, a circulation blower, and a burner. The...
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5285959 |
Air heating apparatus
An air heating apparatus such as a fan heater, a forced circulation type ware air heater, and, an air conditioner and heater, is operated while the amount of radiation is taken into consideration....
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5271556 |
Integrated furnace control
An HVAC controller including a first input; a second input; first means, responsive to a first signal received on the first input, for generating a first mode of operation; second means, responsive...
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5269458 |
Furnace monitoring and thermostat cycling system for recreational vehicles and marine vessels
Recreational vehicles and marine vessels provide for cabin environment heating by a thermostatically controlled furnace which is typically fueled by a portable supply of liquefied petroleum gas and...
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5248083 |
Adaptive furnace control using analog temperature sensing
An adaptive furnace controller utilizing analog temperature sensing to maintain a constant preselected temperature in the heat exchanger during operation. The adaptive furnace control measuring...
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5244146 |
Energy-conserving thermostat and method
A thermostat is described for controlling a furnace for a hot air, hot water, or steam heating system which delivers heat to a heated space via a delivery system. The thermostat causes the system...
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5197664 |
Method and apparatus for reducing thermal stress on heat exchangers
The present invention is a furnace control system responsive to a circulator fan motor fault condition. Upon detection of the fault, the control determines a first time period which is required to...
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5186386 |
Two stage furnace control
The present invention discloses a two stage furnace control. The control includes a gas valve, an ignitor, a low pressure switch, a high pressure switch and a control unit for enabling the inducer...
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