Room unit for an HVAC system

A room unit for an HVAC system comprising a connection means to connect the device to the HVAC system, a controller and a housing, whereby the housing comprises:

• a) a mounting plate configured to install the room unit on a wall of a building, wherein the mounting plate comprises a base plate with a circumferential rim projecting away perpendicularly from the base plate, and wherein the mounting plate comprises at least one first protrusion projecting away from an outer surface of the rim in a direction parallel to the base plate;
• b) a housing frame configured to be attached to the mounting plate, wherein the housing frame comprises a circumferential side wall that laterally surrounds the inside of the room unit, and wherein the side wall is configured to receive the rim of the mounting plate with positive fit;
• wherein the housing frame comprises at least one second protrusion projecting away from an inner surface of the side wall towards an opposite inner surface of the housing frame;
• wherein the at least one first protrusion of the mounting plate and the at least one second protrusion of the housing frame are configured such that they interlock with each other with a positive fit when the rim of the mounting plate is at least partly received in the circumferential side wall of the mounting frame;
• c) at least one mechanical connector arranged at a side opposite to the at least one first and second protrusions and configured to secure the housing frame to the mounting plate when the at least one first and the second protrusions are interlocked in a positive fit and the rim of the mounting plate is entirely received in the mounting frame, and
• d) a front housing part configured to close the housing frame at a free end opposite the mounting plate.