Method and system for compressor modulation in non-communicating mode
AssigneeLennox Industries Inc.
InventorsUmesh Gokhale, Eric Berg
Life of this patent
Estimating the term…
Abstract
An HVAC system includes a pressure sensor is disposed in a suction line between a compressor and an indoor heat-exchange coil. The pressure sensor is electrically coupled to a compressor controller. An HVAC controller is electrically coupled to the compressor controller. The HVAC controller is configured to transmit a signal to the compressor controller to activate and de-activate the compressor. The compressor controller is configured to receive a signal from the HVAC controller to activate the compressor, determine a start speed of the compressor, monitor a run time of the compressor, and modulate a speed of the compressor.
Claims20
A method of modulating a speed of a compressor, the method comprising:
- receiving a signal from an HVAC controller to at least one of activate and de-activate the compressor;
- determining a start speed of the compressor;
- activating the compressor at the determined start speed;
- monitoring a run time of the compressor;
- determining whether the run time of the compressor is greater than a minimum run time;
- responsive to a determination that the run time of the compressor is greater than the minimum run time, modulate a speed of the compressor to maintain a desired suction pressure;
- determining whether the run time of the compressor is greater than or equal to a desired cycle time;
- and
- responsive to a determination that the run time of the compressor is greater than or equal to the desired cycle time, increase the speed of the compressor to lower the desired suction pressure.
A heating, ventilation, and air-conditioning (HVAC) system comprising:
- an indoor circulation fan arranged to circulate air through an indoor heat-exchange coil;
- an outdoor circulation fan arranged to circulate air through an outdoor heat-exchange coil;
- a compressor fluidly coupled to the outdoor heat-exchange coil and fluidly coupled to the indoor heat-exchange coil;
- a compressor controller electrically coupled to the compressor;
- an HVAC controller electrically coupled to the compressor controller, the HVAC controller configured to transmit a signal to the compressor controller to at least one of activate and de-activate the compressor;
- the compressor controller configured to:
- receive a signal from the HVAC controller to activate the compressor;
- determine a start speed of the compressor;
- monitor a run time of the compressor relative to a minimum run time and a desired cycle time;
- determine whether the run time of the compressor is greater than a minimum run time;
- responsive to a determination that the run time of the compressor is greater than the minimum run time, modulate a speed of the compressor to maintain a desired suction pressure;
- determine whether the run time of the compressor is greater than or equal to a desired cycle time;
- and
- responsive to a determination that the run time of the compressor is greater than or equal to the desired cycle time, increase the speed of the compressor to lower the desired suction pressure.
A compressor system comprising:
- an outdoor circulation fan arranged to circulate air through an outdoor heat-exchange coil;
- a compressor controller electrically coupled to a compressor, the compressor controller configured to:
- receive a signal from a heating, ventilation, and air-conditioning (HVAC) controller to activate the compressor;
- determine a start speed of the compressor;
- monitor a run time of the compressor relative to a minimum run time and a desired cycle time;
- determine whether the run time of the compressor is greater than a minimum run time;
- responsive to a determination that the run time of the compressor is greater than the minimum run time, modulate a speed of the compressor to maintain a desired suction pressure;
- determine whether the run time of the compressor is greater than or equal to a desired cycle time;
- and
- responsive to a determination that the run time of the compressor is greater than or equal to the desired cycle time, increase the speed of the compressor to lower the desired suction pressure.
Dependencies are inferred from the claim text.