In a heating and air conditioning system, water must be distributed from the supply system to the point of consumption. This is done by means of the main circulator pump.
Larger systems can be divided into several pipe circuits with each their local pump. The main pump is the pump that distributes the total amount of water from the supply source.
Due to variations in heat demand and flow in large systems, speed-controlled pumps are recommended in parallel as main pumps. By using speed-controlled pumps, it is also possible to obtain maximum energy savings. A maximum of three pumps plus one standby pump is recommended.
Grundfos circulator and in-line single-stage pumps are effective as the main water pump in heating and air-conditioning applications.