Abstract: A room unit for an HVAC system is disclosed including a connection means to connect the device to the HVAC system, a controller and a housing. The housing includes a mounting plate for installing a room unit on a wall of a building. The mounting plate includes a base plate with a circumferential rim projecting away perpendicularly from the base plate. The mounting plate includes at least one first protrusion projecting away from an outer surface of the rim in a direction parallel to the base plate. The housing frame includes a circumferential side wall that laterally surrounds the inside of the room unit. The side wall is configured to receive the rim of the mounting plate with positive fit. The housing frame includes at least one second protrusion projecting away from an inner surface of the side wall towards an opposite inner surface of the housing frame.

Abstract: An air treatment device is disclosed. The air treatment device includes an air duct configured to deliver an air flow. A first filter stage is included and comprises at least one air filter arranged in the air duct for filtering the air flow. At least a second filter stage is also included and comprises at least one further air filter and is arranged downstream of the first filter stage (for filtering the air flow after having passed the first filter stage. The second filter stage is controllable between at least two states with different filtration efficiencies, whereby, with respect to a filtration efficiency in the first state, a filtration efficiency in the second state is lower, in particular the filtration efficiency in the second state is essentially zero. An air quality sensor is also present, the sensor allowing for measuring the air quality of the air flow in between the first and the second air filter stages.

Abstract: A method of controlling an HVAC system (10) that comprises least one flow regulator (16), an electromechanical actuator (20), one or more sensors (34) associated with the actuator, and a controller (32) operatively connected with the actuator and with the sensors. The method includes the steps of actuating the flow regulator, receiving signals from the sensors, and determining an actual or forthcoming malfunction based on the signals. It is determined whether the malfunction is in the actuator or the flow regulator.

Abstract: A room unit for an HVAC system is disclosed including a connection means to connect the device to the HVAC system, a controller and a housing. The housing includes a mounting plate for installing a room unit on a wall of a building. The mounting plate includes a base plate with a circumferential rim projecting away perpendicularly from the base plate. The mounting plate includes at least one first protrusion projecting away from an outer surface of the rim in a direction parallel to the base plate. The housing frame includes a circumferential side wall that laterally surrounds the inside of the room unit. The side wall is configured to receive the rim of the mounting plate with positive fit. The housing frame includes at least one second protrusion projecting away from an inner surface of the side wall towards an opposite inner surface of the housing frame.

Abstract: A room unit for an HVAC system is disclosed. The system includes a housing for installing the room unit on a wall of a building; a connection means to connect the device to the HVAC system; a controller being arranged on a first printed circuit board; and at least one temperature sensor to measure the temperature of ambient air, whereby the at least one temperature sensor is arranged on a frontside of a second printed circuit board. In addition, the second printed circuit board protrudes from the first printed circuit board, especially in a direction perpendicular to the first printed circuit board. Still further, the second printed circuit board is arranged such that a backside of the second printed circuit board is in physical contact with an inner surface of the housing.

Abstract: A method of detecting an operating condition of a controllable flow regulator in a fluid flow channel of an HVAC system, comprising transmitting a sonic signal, from a sonic transmitter, directly or indirectly to the flow regulator, the sonic signal being distinguished from background noise by being at least one of: (i) modulated according to a modulation schema, (ii) an ultrasonic signal, (iii) a frequency selected to be away from background noise, receiving a signal from a sonic receiver for detecting the transmitted signal after interacting with the flow regulator; and determining, in an electronic signal processor, the operating condition of the flow regulator on the basis of the signal received.

Abstract: An air treatment device is disclosed. The air treatment device includes an air duct configured to deliver an air flow. A first filter stage is included and comprises at least one air filter arranged in the air duct for filtering the air flow. At least a second filter stage is also included and comprises at least one further air filter and is arranged downstream of the first filter stage (for filtering the air flow after having passed the first filter stage. The second filter stage is controllable between at least two states with different filtration efficiencies, whereby, with respect to a filtration efficiency in the first state, a filtration efficiency in the second state is lower, in particular the filtration efficiency in the second state is essentially zero. An air quality sensor is also present, the sensor allowing for measuring the air quality of the air flow in between the first and the second air filter stages.

Abstract: A method of controlling a Heating, Ventilating and Air Conditioning (HVAC) system including a fluid transportation network that includes one or more network sections, each network section being connected to a fluid transportation circuit through respective supply lines and return lines, each network section including plural parallel zones, includes arranging a pressure regulating device in the supply lines and/or respective return lines of the network sections, arranging flow regulating devices in the zones of the network sections, measuring a remote differential pressure of the fluid in a first zone of the plurality of zones of each of the network sections, and controlling, by a controller, the pressure regulating devices of each network section to maintain the measured remote differential pressure within a specified differential pressure range.

Abstract: A method of controlling a thermal power transfer of a thermal energy exchanger (80) of an HVAC system (1), the method comprising: receiving, by a controller (10), a setpoint thermal power transfer (Power SP); measuring, by a flow sensor (52), a measured flow of fluid (?act) through the thermal energy exchanger (80); determining, by the controller (10), an estimated thermal power transfer (Power EST), using the measured flow of fluid (?act) and a defined flow rate to delta-T mapping; comparing, by the controller (10), the setpoint thermal power transfer (Power SP) and the estimated thermal power transfer (Power EST); and regulating, by the controller (10), the flow (?act) of the fluid (W) through the thermal energy exchanger (80) based on the comparing.

Abstract: For monitoring and controlling an HVAC system which comprises one or more fluid transportation systems with a plurality of parallel zones, a plurality of operating variables of the fluid transportation systems are received (S1) from devices of the HVAC system. Temporal courses are determined (S3) for the operating variables. Interdependencies are determined (S4) between the temporal courses of the operating variables. Depending on the interdependencies, the operating variables and their associated devices are grouped (S5) into different sets which each relates to a different section of the HVAC system and includes the related operating variables and associated devices. The sets are used (S6) to control the devices of a particular section of the HVAC system and/or to generate a fault detection message regarding one or more of the devices of the particular section of the HVAC system.

Abstract: The invention relates to an electronic flow controller (30) for applications in the HVAC field, said electronic flow controller comprising a one-piece valve body (31) which is penetrated by a flowing medium. The valve body is divided into a valve portion (31a) and a flow measurement portion (31b) along the flow direction, wherein a valve element (32) is arranged in the valve section (31a) for the control of flow, wherein said valve element can be controlled from the outside via a valve spindle (33), and wherein a measurement path (36) is formed in the flow measurement portion (31b) for determining the flow rate by means of ultrasound. In order to achieve a compact arrangement and a greatly simplified assembly, accesses (34a, b) for coupling and/or outcoupling ultrasound into or from the measuring path (36) are formed on the valve body (31) in the region of the flow measurement portion (31b).

Abstract: Disclosed is an HVAC (heating, ventilation and air-conditioning) system which comprises a fluid flow duct (1), a fluid flow valve (7) which is arranged therein and has a valve body (5) in the fluid flow duct (1) and a valve motor (15) which moves the valve body (5), a control circuit for activating the valve motor, a sensor (8) in the fluid flow duct (1) and an evaluation module for evaluating signals of the sensor. To produce an automated functional control, the following procedure is adopted: a first actuation signal is preset for the valve motor by the control circuit, and the actuation signal corresponds to a first setpoint position of the valve body (5), registration of a first signal of the sensor (8) by the evaluation module, and determination of a functional diagnosis of the fluid flow valve on the basis of the first signal of the sensor.

Abstract: A control unit (22) for an HVAC system (10) comprises an economizer (EC), which economizer (EC) is configured to introduce outdoor air (OA) into the HVAC system (10) for cooling and/or ventilation purposes in a manner controlled by said control unit (22), said control unit (22) comprising a base module (23) with: a control circuit (24), a man machine interface (25) connected to said control circuit (24), and first I/O means for connecting at least one sensor (32, . . . , 36) of said HVAC system to said control circuit (24) and for delivering at least one control signal from said control circuit (24) to control the operation of said economizer (EC). Said base module (23) is configured to optionally receive at least one extension module (26, 27, 28), which can be snapped on and electrically connected to said base module (23) for expanding the functionality of said control unit (22).

Abstract: The invention relates to a method for determining the heat flow (dQ/dt) emanating from a heat transporting fluid (12), which is a mixture of at least two different fluids, and which flows through a flow space (11) from a first position, where it has a first temperature (T1), to a second position, where it has, due to that heat flow (dQ/dt), a second temperature (T2), which is lower than said first temperature (T1), whereby the density and specific heat of said heat transporting fluid (12) is determined by measuring the speed of sound (vs) in said fluid, and said density and specific heat of said heat transporting fluid (12) is used to determine the heat flow (dQ/dt).

Abstract: A connecting device comprises housing, a board with electrical components, including at least one digital bus connection and an input/output section. It allows outsourcing of analogue and digital I/O from a connected device, e.g. an HVAC actuator control unit by decentralizing inputs and outputs.