Multistage hvac system with modulating device demand control

A controller for a plurality of devices of a building control system that operate in parallel to provide a desired capacity of heating or cooling for a building space, the controller comprising:

• a capacity identifier configured to identify the desired capacity of heating or cooling for the building space;
• a combination finder configured to generate a list of combinations of the plurality of devices that can be energized to provide the desired capacity of heating or cooling, each of the combinations comprising one or more of the plurality of devices;
• a combination filter configured to remove any combinations from the list of combinations that do not meet one or more requirements;
• a make and break point selector configured to set one or more make and break points dependent on the desired capacity of heating or cooling according to the list of combinations and a capacity range of one or more modulating devices;
• and
• a signal generator configured to generate one or more control signals in accordance with the make and break points and operate the plurality of devices using the control signals.