Wiring of the Aqua MB250 Control Unit Pump

If it is necessary to install a new pump on an Aqua MB250 control unit, it is mandatory to modify the wiring to ensure proper operation.

In previous models, the pump connection was made via terminals 7 and 8, with activation via Triac. The new pumps, however, require activation via relay.

Therefore, it is necessary to:

1. Connect the pump to terminals 17 and 21.
2. Insert a jumper between terminals 18 and 19.
3. Update the control unit firmware to the latest available version.

Firmware update is essential to ensure compatibility with the new relay control system.

If you do not have the programmer, it is possible to connect the pump to terminals 22 and 24 if free (without reprogramming the control unit).