Variable capacity control can be achieved by manipulating which components together or independently?

Variable capacity control refers to the ability to adjust the capacity of a system, such as a refrigeration or air conditioning system, to meet varying demand. This is often accomplished using slide valves and slide stop controls.

Slide valves are mechanisms that can modulate the flow of refrigerant or air in a system. By adjusting the position of these valves, the system can control how much refrigerant flows through the evaporator or condenser, thus altering the cooling capacity. Slide stop controls complement this by determining when and how much to open or close the slide valves based on the system's operational needs.

The other components mentioned—compressor motors and belts, as well as pressure sensors and gauges—play critical roles in the operation of HVAC systems but do not directly control the capacity in the same way that slide valves and slide stop controls do. While compressor motors influence performance and pressure sensors provide important feedback for system regulation, capacity modulation primarily relies on the mechanical manipulation of flow paths, which is the function of slide valves and corresponding controls.