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Browse by Category: Main > Electrical & Energy
Class Information
Number: 236/1EA
Name: Automatic temperature and humidity regulation > Miscellaneous > Multistage controls > Multiple valve staging

Patents under this class:
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Patent Number Title Of Patent Date Issued
8533975 Apparatus and method for refrigeration cycle elevation by modification of cycle start condition Sep. 17, 2013
8387273 Heat-pump clothes drying machine Mar. 5, 2013
8365542 Frost free sub zero air conditioner Feb. 5, 2013
RE42966 Tandem compressors with discharge valve on connecting lines Nov. 29, 2011
7296426 Interactive control system for an HVAC system Nov. 20, 2007
7083109 Thermostat having modulated and non-modulated provisions Aug. 1, 2006
6966192 Tandem compressors with discharge valve on connecting lines Nov. 22, 2005
6951116 Air conditioner and method for controlling electronic expansion valve of air conditioner Oct. 4, 2005
6871505 Compressor-controlling device and method for air conditioner comprising a plurality of compressors Mar. 29, 2005
6807816 Air conditioning system with two compressors and method for operating the same Oct. 26, 2004
6758208 Flexible gas-fired heat exchanger system Jul. 6, 2004
6722576 Method for operating air conditioner in warming mode Apr. 20, 2004
6609904 Gas furnace control arrangement Aug. 26, 2003
6540148 Method and apparatus for sequencing multistage systems of known relative capacities Apr. 1, 2003
6474085 Refrigerating apparatus Nov. 5, 2002
6370894 Method and apparatus for using single-stage thermostat to control two-stage cooling system Apr. 16, 2002
6233954 Method for controlling the operation of a compression system having a plurality of compressors May. 22, 2001
6185946 System for sequencing chillers in a loop cooling plant and other systems that employ all variable-speed units Feb. 13, 2001
6058729 Method of optimizing cooling capacity, energy efficiency and reliability of a refrigeration system during temperature pull down May. 9, 2000
6047557 Adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor Apr. 11, 2000
5701750 Zone demand controlled dual heat pump system and controller therefor Dec. 30, 1997
5626027 Capacity control for multi-stage compressors May. 6, 1997
5577390 Compressor for single or multi-stage operation Nov. 26, 1996
5572878 Air conditioning apparatus and method of operation Nov. 12, 1996
5327742 Hierarchial control for discrete chiller units Jul. 12, 1994
5316073 Twinning control May. 31, 1994
5265436 Control apparatus for air-conditioners Nov. 30, 1993
5222370 Automatic chiller stopping sequence Jun. 29, 1993
5195329 Automatic chiller plant balancing Mar. 23, 1993
5170636 Heat exchanger Dec. 15, 1992
5119884 Multiple stage electronic temperature control for heating and cooling Jun. 9, 1992
5094085 Refrigerating cycle apparatus with a compressor having simultaneously driven two compressor means Mar. 10, 1992
4903502 Rate of change temperature control for transport refrigeration systems Feb. 27, 1990
4812997 Control apparatus for an air conditioning system Mar. 14, 1989
4756473 Cooling method control system for electronic apparatus Jul. 12, 1988
4735055 Method of operating a transport refrigeration system having a six cylinder compressor Apr. 5, 1988
4703795 Control system to delay the operation of a refrigeration heat pump apparatus after the operation of a furnace is terminated Nov. 3, 1987
4638767 Heating system Jan. 27, 1987
4628700 Temperature optimizer control apparatus and method Dec. 16, 1986
4614089 Controlled refrigeration system Sep. 30, 1986
4612776 Method and apparatus for controlling capacity of a multiple-stage cooling system Sep. 23, 1986
4539821 Capacity control device for controlling a variable displacement compressor in an air conditioning system Sep. 10, 1985
4535602 Shift logic control apparatus for unequal capacity compressors in a refrigeration system Aug. 20, 1985
4501125 Temperature conditioning system staging control and method Feb. 26, 1985
4494383 Air-conditioner for an automobile Jan. 22, 1985
4483152 Multiple chiller control method Nov. 20, 1984
4467616 Temperature control system for an air conditioner Aug. 28, 1984
4463574 Optimized selection of dissimilar chillers Aug. 7, 1984
4459815 Air conditioner Jul. 17, 1984
4442972 Electrically controlled programmable digital thermostat and method for regulating the operation of multistage heating and cooling systems Apr. 17, 1984

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