Heating and refrigerating unit and method for the control thereof

A multipurpose heating and refrigerating unit (1) comprising a primary refrigerating circuit (2), a secondary refrigerating circuit (3), a first water-producing circuit (4) producing water at a first temperature, a second circuit (5) producing water at a second temperature above the first temperature, a third circuit (6) producing water at a third temperature above the second temperature, the primary refrigerating circuit (2) comprising at least one first low-pressure primary heat exchanger (7) connected to the first water-producing circuit (4) and at least one first high-pressure primary heat exchanger (8) connected to the second water-producing circuit (5), the secondary refrigerating circuit (3) comprising at least one first low-pressure secondary heat exchanger (11) connected to the second water-producing circuit (5), and at least one first high-pressure secondary heat exchanger (12) connected to the third water-producing circuit (6).