What is PWM

PWM is a pulse signal used to send speed or power commands to the circulator.

What is 0–10 V

It is an analog voltage signal. The voltage corresponds to a specific speed or flow command.

Why they are used

The boiler or heat pump can dynamically adjust the flow rate according to the load.

Common problems

  • Severed signal cable.
  • Wrong type of control.
  • Incorrect polarity.
  • Incompatibility between controller and circulator.

Example

If the circulator stays permanently at very low speeds even when there is demand, check the control signal before assuming a mechanical failure.

Important

Electrical measurements must be performed in accordance with the manual and by properly qualified personnel.