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...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 4539821 | Capacity control device for controlling a variable displacement compressor in an air conditioning system A capacity control device for a variable displacement compressor in a refrigerating or air conditioning system is disclosed. The capacity control device controls the operation of a variable displacement device having two variable displacement valves for c... | 09/10/1985 |
| 4535602 | Shift logic control apparatus for unequal capacity compressors in a refrigeration system Apparatus for capacity selecting compressor energization and deenergization in a commonly piped, multiple compressor system comprising largely compressor of unequal capacity wherein the minimum number of such compressors are cycled on/off together and whe... | 08/20/1985 |
| 4501125 | Temperature conditioning system staging control and method A control for a multi-stage heating and cooling system used to temperature conditioning a comfort zone. The control includes a microprocessor responsive to a temperature sensor installed in the comfort zone. Heating and cooling setpoints and a lookup tabl... | 02/26/1985 |
| 4494383 | Air-conditioner for an automobile An air-conditioner for an automobile is disclosed which is provided with a compressor adapted to be directly connected to the engine, the compressor being provided with two coaxial compressing cylinders each having a different displacement, whereby the cy... | 01/22/1985 |
| 4483152 | Multiple chiller control method A multiple chiller control system includes a temperature controller TC, a data base and optimizer DBO, and a plurality of driven-servo loops DSL1, DSL2, . . . DSLn. The temperature controller and the data base and optimizer monitor various parameters of t... | 11/20/1984 |
| 4467616 | Temperature control system for an air conditioner The disclosed temperature control system for an air conditioner includes a sensor for sensing an actual air temperature and a comparator for determining the temperature difference between the sensed actual air temperature and a set air temperature after t... | 08/28/1984 |
| 4463574 | Optimized selection of dissimilar chillers A system for meeting building air conditioning load conditions by optimally selecting a combination of chillers having dissimilar efficiency characteristics, the system having a load sensor for sensing building load a refrigerant head sensor for sensing r... | 08/07/1984 |
| 4459815 | Air conditioner An air conditioner includes a plurality of refrigerant compressors, a plurality of ventilating fans and a cooling/warming water pump which is controlled by both a memory and a contact-less control unit in accordance with an outdoor temperature and a refri... | 07/17/1984 |
| 4442972 | Electrically controlled programmable digital thermostat and method for regulating the operation of multistage heating and cooling systems An electronically controlled programmable wall thermostat provides better control of comfort temperature and permits improved energy-saving temperature setback at selected intervals of the day or night in multistage heating and cooling systems and is part... | 04/17/1984 |
| 4404815 | Air conditioning economizer control method and apparatus An air conditioning economizer control method and apparatus for integrating the operation of the economizer with an air conditioning system is disclosed. An economizer position control arrangement is further disclosed incorporating a rotor locking circuit... | 09/20/1983 |
| 4387763 | Multistage thermostat using multirate integral action and exponential setpoint change A multistage thermostat means that is adapted for use with equipment such as a heat pump and auxiliary heat and which effects efficient operation upon a temperature setup after a nigh setback function by introducing an exponential change in the apparent c... | 06/14/1983 |
| 4384462 | Multiple compressor refrigeration system and controller thereof A multiple-compressor refrigeration system for use in commercial refrigeration applications includes a plurality of compressors of unequal refrigeration capacity connected in a refrigeration circuit that includes a condenser and a plurality of associated ... | 05/24/1983 |
| 4379484 | Control for a variable air volume temperature conditioning system-outdoor air economizer A solid-state control for a variable air volume (VAV) temperature conditioning system adapted to control a plurality of refrigerant cooling stages, and in particular, to modulate an outdoor air economizer. The control includes both an outdoor ambient air ... | 04/12/1983 |
| 4379483 | Method of controlling heating and cooling sources A method of controlling heating and cooling sources utilizes a computer or an electronic thermostat to control a plurality of heating or cooling resources for regulating indoor temperature within a narrow temperature range. The method maintains a temperat... | 04/12/1983 |
| 4368502 | Lead-lag load lockout control A lockout control system locks out the lag load upon occurrence of a predetermined condition in a dual load system set up in a lead-lag configuration. The lockout control system utilizes a lead-lag memory circuit for insuring that only the lag load is loc... | 01/11/1983 |
| 4357988 | Air-conditioning/heating system A dual capacity air-conditioning/heating system including an evaporator, a blower, a compressor and compressor motor, the compressor motor having a two-speed mode of operation. The compressor motor speeds are changed by changing the shunt field current of... | 11/09/1982 |
| 4356961 | Dual deadband control system A temperature control system utilizing a plurality of heating or cooling devices to maintain the temperature at a desired level, minimizing rapid multi-stage cycling by using dual deadband zones.... | 11/02/1982 |
| 4353409 | Apparatus and method for controlling a variable air volume temperature conditioning system Apparatus and method for controlling a temperature conditioning system in which a plurality of stages of temperature conditioning apparatus may be selectively energized to meet a temperature conditioning demand in a comfort zone into which the flow of tem... | 10/12/1982 |
| 4352635 | Multi-speed fan assembly Apparatus for rotating a fluid impeller of a centrifugal or axial flow fan, at multiple speeds. A fan is provided with a first and a second electric motor for drivingly rotating a fluid impeller at relatively fast and slow speeds, respectively. The rotor ... | 10/05/1982 |
| 4338791 | Microcomputer control for heat pump system A method of controlling energy usage of a multi-state heat pump system in which the system includes a preprogrammed microprocessor-based controller which places and maintains the system in the most energy efficient mode of operation consistent with achiev... | 07/13/1982 |
| 4325224 | Method and apparatus for transport refrigeration system control A transport refrigeration system having the capability of either heating or cooling at high or low speed and with the compressor loaded or unloaded is controlled by a temperature control system including a heat relay 1K and a speed relay 2K, and has an au... | 04/20/1982 |
| 4272012 | Method and system for controlling a plurality of temperature conditioning units A plurality of temperature conditioning units are divided into groups with the groups being sequentially and repetitively, one after the other, enabled for a first preset number of timing intervals and then disabled for a second preset number of timing in... | 06/09/1981 |
| 4270597 | Thermostat and circuit A thermostat adapted to regulate the operation of a heating system and a cooling system in response to the temperature in a space conditioned by the systems. The thermostat has a pair of means selectively movable to respective ones of adjusted positions a... | 06/02/1981 |
| 4270362 | Control system for an air conditioning system having supplementary, ambient derived cooling Temperature and humidity electrical/electronic control circuits and apparatus to maintain a room at a constant temperature and humidity. The control system is adapted to an environmental condition controller for year-around cooling utilizing a liquid reci... | 06/02/1981 |
| 4259847 | Stepped capacity constant volume building air conditioning system An air conditioning system is disclosed in which the air conditioning capacity is stepped to a lower level upon reduced sensible air conditioning demand. The stepped reduction involves both a stepped reduction of blower capacity and a stepped change of th... | 04/07/1981 |
| 4248053 | Dual capacity compressor with reversible motor and controls arrangement therefor In the main intended application of the arrangement according to the invention, that is, using a reversible motor compressor in a heat pump in a refrigerating or air conditioning system, it is desirable to insure a delay during reversal of the direction o... | 02/03/1981 |
| 4210957 | Operating optimization for plural parallel connected chillers An optimization system for switching between plural parallel connected chillers in a refrigeration system is disclosed which system establishes optimized changeover criteria based upon the design refrigerant head for the chillers, the minimum refrigerant ... | 07/01/1980 |
| 4191027 | Apparatus for cooling brine An apparatus for cooling brine comprising a plurality of refrigerating units connected to a slow-current tank for brine in such a manner said refirgerating units are associated with successive portions of brine in said slow-current tank from the downstrea... | 03/04/1980 |
| 4184341 | Suction pressure control system A refrigeration system including multiple parallel compressors for maintaining evaporator suction pressures within preselected ranges, said compressors being sequentially and cyclically operative through control switch means responsive to preselected uppe... | 01/22/1980 |
| 4152902 | Control for refrigeration compressors A device for controlling a single variable capacity compressor, or multiple variable capacity compressors in either parallel flow or series flow chilling systems, senses temperature and load conditions and uses feedback in conjunction with synchronously a... | 05/08/1979 |
| 4114807 | Control system This system is of the power management type and is for controlling the operation of the various stages within a number of units such as heating, ventilation, and air conditioning units commonly referred to as HVAC units which may be of conventional design... | 09/19/1978 |
| 4085594 | Control system for cooling tower fans A control system for automatically controlling the operation of a plurality of fans for a cooling tower so that the minimum number of fans and the lowest speeds are used to provide the required cooling necessary at any one time. The fans are individually ... | 04/25/1978 |
| 4084388 | Refrigeration control system for optimum demand operation A control sysem for controlling a plurality of refrigeration compressors has an input circuit for receiving a plurality of control signals from control devices for a plurality of evaporators connected to the refrigeration compressors with means for contro... | 04/18/1978 |
| 4081691 | Controller for a multiple stage power device having interchangeable control units The present device incrementally adds or subtracts power units to and from a heating or cooling system and employs a major control board into which are plug-connected a plurality of minor control boards. The minor control boards have varying designs. Some... | 03/28/1978 |
| 3993120 | Space thermostat A space thermostat for controlling the two-stage operation of both heating and cooling apparatus includes two single-pole, double-throw mercury type switches operatively connected to a single bimetallic coil. One switch energizes stage one of the heating ... | 11/23/1976 |
