Controlling a variable-speed heating, ventilation and air-conditioning system using a non-communicating two-stage thermostat
AssigneeCarrier Corporation
InventorDerek Leman
Life of this patent
Estimating the term…
Abstract
A method is provided for controlling a variable-speed heat, ventilation and air conditioning (HVAC) system. The method includes, responsive to a first signal, determining a system capacity and providing the system capacity by the variable-speed HVAC system to a space, responsive to the first signal and a second signal, providing a system maximum capacity by the variable-speed HVAC system to the space and, responsive to an off signal, shutting off of the variable-speed HVAC system.
Claims20
A method for controlling a variable-speed heat, ventilation and air conditioning (HVAC) system, the method comprising:
- responsive to a first signal, determining a system capacity and providing the system capacity by the variable-speed HVAC system to a space;
- responsive to the first signal and a second signal, providing a system maximum capacity by the variable-speed HVAC system to the space;
- and
- responsive to an off signal, shutting off of the variable-speed HVAC system.
A method for controlling a variable-speed heat, ventilation and air conditioning (HVAC) system comprising a thermostat and a controller, the method comprising:
- determining, by the thermostat, whether to issue:
- a first signal indicating first HVAC system operation,
- a second signal indicating second HVAC system operation, and
- an off signal indicating HVAC system shut-off;
- issuing, based on determination results, one or more of the first signal, the second signal and the off signal to the controller by the thermostat;
- determining a system capacity and causing the variable-speed HVAC system to provide the system capacity to a space by the controller when the controller receives only the first signal;
- causing the variable-speed HVAC system to provide a system maximum capacity to the space by the controller when the controller receives the first and second signals;
- and
- shutting off the variable-speed HVAC system by the controller when the controller receives the off signal.
A system for controlling a variable-speed heat, ventilation and air conditioning (HVAC) system, the system comprising:
- a controller of the HVAC system;
- and
- a thermostat configured to determine whether to issue a first signal indicating low capacity HVAC system operation, a second signal indicating high capacity HVAC system operation and an off signal indicating HVAC system shut-off and to issue one or more of the first signal, the second signal and the off signal to the controller based on determination results,
- the controller being configured to:
- determine a system capacity and cause the variable-speed HVAC system to provide the system capacity to a space upon receipt of only the first signal;
- cause the variable-speed HVAC system to provide a system maximum capacity to the space upon receipt of the first and second signals;
- and
- shut off the variable-speed HVAC system upon receipt of the off signal.
Dependencies are inferred from the claim text.