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RE42966 |
Tandem compressors with discharge valve on connecting lines
A refrigerant cycle is disclosed having a number of compressors operating in tandem and supplying a compressed refrigerant to a refrigerant system. Discharge lines communicate a compressed...
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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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7083109 |
Thermostat having modulated and non-modulated provisions
A thermostat providing modulated or analog control of valves or dampers of an air management system. This permits operating a single cooling or heating stage with partially open valves or dampers...
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6966192 |
Tandem compressors with discharge valve on connecting lines
A refrigerant cycle is disclosed having a number of compressors operating in tandem and supplying a compressed refrigerant to a refrigerant system. Discharge lines communicate a compressed...
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6951116 |
Air conditioner and method for controlling electronic expansion valve of air conditioner
Disclosed are an air conditioner in which one or more compressors are operated so that the refrigerant compression capacity of the operating compressor(s) is variably changed in accordance with a...
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6871505 |
Compressor-controlling device and method for air conditioner comprising a plurality of compressors
Disclosed are compressor-controlling device and method for an air conditioner comprising a plurality of compressors. In case several compressors selected from the plural compressors are stopped for...
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6807816 |
Air conditioning system with two compressors and method for operating the same
Disclosed are an air conditioning system with two compressors so as to shorten standby time for re-operating a stopped compressor and variably change the compression capacity of a refrigerant...
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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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6722576 |
Method for operating air conditioner in warming mode
Disclosed is a method for operating an air conditioner in a warming mode, including the 100% operation performing step of operating/stopping all of compressors, the load determining step of...
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6609904 |
Gas furnace control arrangement
A gas furnace control arrangement includes a control unit control unit and an operating unit adapted to control the control unit, the control unit having a valve seat holding a set of solenoid...
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6540148 |
Method and apparatus for sequencing multistage systems of known relative capacities
Disclosed is a method and apparatus for controlling multistage systems where the relative capacities (process gains) of each stage are known. The method uses a split-range control concept in order...
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6474085 |
Refrigerating apparatus
A refrigerating apparatus comprising a refrigerating cycle having compressors, a condenser, a liquid receiver, expansion valves and evaporators; and a suction pressure sensor for detecting a...
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6370894 |
Method and apparatus for using single-stage thermostat to control two-stage cooling system
When a single-stage thermostat is appropriately connected to a two-stage cooling system, a microprocessor control activates low and high stages of cooling based on preset parameters. The cooling...
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6233954 |
Method for controlling the operation of a compression system having a plurality of compressors
A fluid compression system includes a plurality of compressors, each compressor having a local controller for controlling operation thereof and a sensor for sensing the pressure of compressed fluid...
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6185946 |
System for sequencing chillers in a loop cooling plant and other systems that employ all variable-speed units
Methods of sequencing parallel units in HVAC systems are described to improve overall system operating efficiency. The improved method is applicable for sequencing parallel centrifugal pumps in a...
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6058729 |
Method of optimizing cooling capacity, energy efficiency and reliability of a refrigeration system during temperature pull down
A unique method of operating a refrigeration system for rapidly pulling down a refrigerated container temperature includes the use and algorithm for operating several system components. The...
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5701750 |
Zone demand controlled dual heat pump system and controller therefor
A thermal zone demand controlled dual cascade arranged heat pump system and system controller for building spaces, having first and second heat pumps and having an air circulation system for...
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5626027 |
Capacity control for multi-stage compressors
In a positive displacement compressor having a plurality of banks, operation can be multi-staged or single staged. Single stage operation can be of a single bank or plural banks in parallel....
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5577390 |
Compressor for single or multi-stage operation
In a positive displacement compressor having a plurality of banks, operation can be multi-staged or single staged. Single stage operation can be of a single bank or plural banks in parallel....
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5572878 |
Air conditioning apparatus and method of operation
Two compressors are connected in tandem for an air conditioning system. A control board that includes a microcontroller controls the operation of the system in response to the energization of first...
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5327742 |
Hierarchial control for discrete chiller units
System and process are disclosed for the hierarchial control of a plurality of discrete chiller units each having individual dedicated controls. The system and process imposes limits on the amount...
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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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5265436 |
Control apparatus for air-conditioners
Multi-purpose indoor units and multi-purpose outdoor units are parallel-connected with each other by refrigerant pipes, and an operating capacity is obtained on the basis of the sum of the demanded...
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5222370 |
Automatic chiller stopping sequence
A control for a multiple chiller refrigeration system whereby a chiller can be stopped at a predetermined load in order that the remaining building load can be picked up by the remaining running...
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5195329 |
Automatic chiller plant balancing
A method and control system for operating a chiller system having a lead compressor and a lag compressor in which the load on the compressors is balanced by limiting the % KW demand on the lag...
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5170636 |
Heat exchanger
A heat exchanger includes a rotary compressor having two compression pumps and a motor for driving the compressor pumps, a condenser connected to the rotary compressor, a regulator connected to the...
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5119884 |
Multiple stage electronic temperature control for heating and cooling
A control device for energizing and de-energizing temperature changing devices having a primary control unit and a secondary control unit is provided. The primary control unit includes means for...
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5094085 |
Refrigerating cycle apparatus with a compressor having simultaneously driven two compressor means
A refrigerating cycle apparatus has, in a sealed casing, a compressor including first and second compressor means driven simultaneously. A refrigerating cycle circuit is constituted by connecting...
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4903502 |
Rate of change temperature control for transport refrigeration systems
Methods and apparatus for controlling the load temperature of a transport refrigeration system to a selected set point temperature by operating modes which include a high capacity cooling mode and...
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4812997 |
Control apparatus for an air conditioning system
A control apparatus for an air conditioning system has an outdoor unit with a compressor, a condenser and a plurality of motorized valves installed to a plurality of branch pipings. A plurality of...
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4756473 |
Cooling method control system for electronic apparatus
A cooling system for an electronic apparatus which cools the electronic apparatus using a plurality of cooling fans and controls the rotational speed of the cooling fans in accordance with the...
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4735055 |
Method of operating a transport refrigeration system having a six cylinder compressor
A method of operating a transport refrigeration system having a six cylinder compressor and a prime mover operable at a selected one of low and high speeds, to control the temperature of a served...
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4703795 |
Control system to delay the operation of a refrigeration heat pump apparatus after the operation of a furnace is terminated
A multistage space thermostat control system for controlling a refrigeration heat pump and a furnace controls the heat pump from a first stage of a space thermostat and a furnace from a second...
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4638767 |
Heating system
The invention provides a control system for a set up including a plurality of boilers, in which each boiler is associated with a control valve which permits or prevents flow through the boiler...
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4628700 |
Temperature optimizer control apparatus and method
Apparatus and method for controlling compressor operation in conjunction with sensing the lowest temperature operating evaporator coil, or area serviced thereby, of a commonly-piped cooling system....
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4614089 |
Controlled refrigeration system
A controlled refrigeration system includes a plurality of refrigerant compressors fed from a common suction manifold (line). Each compressor is associated with a respective controller. The...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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