VRU-D3-BAC • en-us • 2022-04-06 • Subject to change1 / 15 Nominal voltageAC/DC 24 V Nominal voltage frequency50/60 Hz Nominal voltage rangeAC 19.2...28.8 V / DC 21.6...28.8 V Power consumption in operation1.5 W Transformer sizing2 VA plus connected VST actuator Transformer sizing noteImax 20 A @ 5 ms, incl. actuator Connection supply / controlterminals 2.5 mm² Sensor input S1Connection of external sensor (passive / active / switch) Actuator Connection (I) (M)AC/DC 24 V, PP-Link for VST actuator Communicative controlBACnet MS/TP Modbus RTU MP-Bus Number of nodesBACnet / Modbus see interface description MP-Bus max. 8 Operating range Y2...10 V Input Impedance100 kΩ Operating range Y variable0.5...10 V Position feedback U noteMax. 0.5 mA Options: Volume / Δp / Position Position feedback U variable0...10 V Start point 0...8 V End point 2...10 V Override controlz1 motor stop / damper OPEN (AC/DC 24 V) z2 damper CLOSE / MAX (AC/DC 24 V) Configurationvia Belimo Assistant App / PC-Tool Measuring principleBelimo D3, flow through sensor (dynamic measurement) Installation positionposition-independent, no zeroing necessary Measuring range pressure-0.08...2.0 inch WC [-20...500 Pa] Functional Range Differential Pressure0...2.0 inch WC [0...500 Pa] Accuracy Differential Pressure±0.004 in WC @ 0...0.08 in WC [±1 Pa @ 0...20 Pa] ±5% @ 0.08...2 inch WC [20...500 Pa] Maximum System pressure6 inch WC [1500 Pa] Pipe influencemax. +2.5%, linear value for 65.6 ft [20 m] hose length (3/16" [5 mm] inner diameter) on duct pressure control (STP) Burst pressure±40 inch WC [±10 kPa]VRU-D3-BAC • en-us • 2022-04-06 • Subject to change2 / 15 • • • • Height CompensationAdjustment of system height (range 0...9800 ft [0...3000 m] above sea level) Condition Measuring Air32...122°F [0...50°C] / 5...95% RH, non- condensing Pressure tube connectionNipple diameter 0.2" [5.3 mm] max. 65.6 ft [20 m] pressure tube length (3/16" [5 mm] inner diameter) for duct pressure control (STP) Protection class IEC/ENIII, Safety Extra-Low Voltage (SELV) Power source ULClass 2 Supply Degree of protection IEC/ENIP42 Degree of protection NEMA/ULNEMA 1 EnclosureUL Enclosure Type 1 EMCCE according to 2014/30/EU Certification IEC/ENIEC/EN 60730-1 Certification ULcULus according to UL60730-1, UL2043, CAN/ CSA E60730-1 Agency ListingListed to UL 2043 - suitable for use in air plenums per Section 300.22(C) of the NEC and Section 602 of the IMC Mode of operationType 1 Rated impulse voltage supply / control0.8 kV Pollution degree2 Ambient temperature32...122°F [0...50°C] Storage temperature-40...176°F [-40...80°C] Ambient humidityMax. 95% RH, non-condensing Servicingmaintenance-free Weight0.66 lb [0.30 kg] The device must not be used outside the specified field of application, especially not in aircraft or in any other airborne means of transport. Only authorized specialists may carry out installation. All applicable legal or institutional installation regulations must be complied during installation. The device may only be opened by lifting the cover. It does not contain any parts that can be replaced or repaired by the user. The device contains electrical and electronic components and must not be disposed of as household refuse. All locally valid regulations and requirements must be observed. The VAV universal controller VRU-D3-BAC is used in the comfort area for pressure-independent control of VAV units, for recording a volumetric flow or for controlling duct pressure. See application library for description. Pressure measurement The integrated D3 differential pressure sensor is also suitable for very small volumetric flows. The maintenance-free sensor technology enables a wide range of applications in the HVAC comfort area: residential construction, office, hotel, etc. Actuators For the various applications and damper designs, the VAV unit manufacturer has various actuator variants with running times of 2.5 ...120 s available. Control functions Volumetric flow (VAV/CAV), duct pressure (STP) or Position Control (Open-Loop)VRU-D3-BAC • en-us • 2022-04-06 • Subject to change3 / 15 Variable air volume control in the V'min...V'max range, demand-dependent via a modulating reference variable (analogue or bus), e.g. room temperature, CO₂ controller for energy-saving air conditioning of individual rooms or zones. V'nom, Δp @ V'nom OEM specific calibration parameters, suitable for the VAV unit Adjustment range Δp @ V'nom: 0.16...2.0 inch WC [38...500 Pa] V'max / Max Maximum operating volume flow, adjustable 20...100% V'nom V'min / Min Minimum operating volume flow, adjustable 0...100% V'nom Constant volume flow control. If required, via step switching (switching contacts) for constant volume flow applications. Steps: CLOSE / Min / Max / OPEN Measurement of a volumetric flow, e.g. for summation or as setpoint measurement for a common extract air box. Transmitter, without damper actuator V'nom, Δp @ V'nom OEM-specific calibration parameters, suitable for the measuring device Adjustment range Δp @ V'nom: 0.16...2.0 inch WC [38...500 Pa] Position Control for integration of the VRU-..-BAC into an external VAV control loop. Transmitter and actuator unit. Max Range: 20...100 % rotation range Min Range: 0...100 % rotation range Channel or branch pressure control in step operation (switching contacts): CLOSE / P'min / P'max or variable specification of the Δp value P'min...P'max via a continuous command variable (analogue or bus). Lower control limit (STP) 20 Pa (from firmware V 1.04-xxxx, older firmware versions: 38 Pa) P'nom OEM-specific calibration parameters: 38...500 Pa P'max Maximum operating pressure, adjustable P'min...100% P'nom P'min Minimum operating pressure, adjustable 20 Pa...100% P'nom Output of the demand signal (damper position) to the higher-level automation system - DCV function (Fan Optimizer). Thanks to the multi-bus functionality of the VRU-...-BAC, the VAV universal controllers can be easily integrated into a bus system. The communication interface is defined on the system using the Belimo Assistant App: BACnet MS/TP, Modbus RTU, Belimo MP-Bus. A hybrid mode is optionally available for BACnet MS/TP and Modbus RTU, bus connection combined with analog control. In bus mode, a sensor (0...10 V / passive) can optionally be connected, e.g. a temperature sensor or a switching contact, for integration into the higher-level bus system. The VRU-..-BAC is based on the new Belimo MP data pool model. If the VRU-..-BAC is used as a VRP-M replacement in an existing MP-Bus system, the VRU-..-BAC can be set to the VRP-M function with the compatibility mode parameter. See instructions: VAV- Universal - MP-Bus Existing system: Replace VRP-M with VRU-..-BAC.VRU-D3-BAC • en-us • 2022-04-06 • Subject to change4 / 15 Control functions Volumetric flow (VAV/CAV), duct pressure (STP - lower control limit 0.08 inch WC [20 Pa]) or Position Control (Open-Loop) Operating settings Min / Max / Nominal Nominal value (OEM setting) Nom Adjustment range Min 1 Adjustment range Max 2 Feedback U 0...100% Nom 3 Control Y Min...Max 4 Smartphone with Belimo Assistant App - contactless operation via the integrated NFC interface. PC-Tool (ZTH EU) - can be locally plugged into the service socket or remotely via MP connection. Dummy plug for VST connector plug, Multipack 25 pcs.ZG-VRU01 Service Tool, with ZIP-USB function, for programmable and communicative Belimo actuators, VAV controller and HVAC performance devices ZTH EU Belimo PC-Tool, Software for adjustments and diagnosticsMFT-P Belimo Assistant App, Smartphone app for easy commissioning, parametrising and maintenance Belimo Assistant App Converter Bluetooth / NFCZIP-BT-NFC Complete functions ZIP-BT-NFC as of production date 2019-10-15VRU-D3-BAC • en-us • 2022-04-06 • Subject to change5 / 15 AC/DC 24 V, modulating (VAV) 1. z1 2. z2 3. a) adaptation b) synchronisation 4. Y-modulating: min...max (see override control z1/z2) Override command 'damper CLOSE' over reference signal Y (in Mode 2...10 V): < 0.3 V = damper CLOSE > 0.3...2 V = V'min 2...10 V = V'min...V'max AC/DC 24 V, contactor step control (CAV) 1. z1 2. z2 3. a) adaptation b) synchronisation 4. Y-steps: CLOSE-MIN-MAX (see override comtrol z1/z2) Contact 2-3 = MAX 3 uncoated = MIN Contact 1-3 = CLOSE (mode 2...10 V) MIN (mode 0...10 V) AC/DC 24 V, override control z1/z2 Contact 11-9 = Motor STOP Contact 11-10 = Damper OPEN Contact 12-13 = Damper CLOSED Contact 12-14 = MAX 11/12 uncoated = priority rule a/b/c/d/eVRU-D3-BAC • en-us • 2022-04-06 • Subject to change6 / 15 MP-Bus 1. z1 2. z2 3. Bus watchdog 4. a) adaptation b) synchronisation 5. Y-step: actuator CLOSED / MIN / MAX 6. Bus override 7. Bus setpoint: min...max A) additional MP-Bus nodes (max. 8) MP-Bus Network topology There are no restrictions for the network topology (star, ring, tree or mixed forms are permitted). Supply and communication in one and the same 3-wire cable • no shielding or twisting necessary • no terminating resistors required BACnet MS/TP / Modbus RTU 1. z1 2. z2 3. Bus watchdog 4. a) adaptation b) synchronisation 5. Bus override 6. Bus setpoint: min...max BACnet MS/TP / Modbus RTU with analog setpoint (hybrid mode) 1. z1 2. z2 3. Bus watchdog 4. a) adaptation b) synchronisation 5. Bus override 6. Y-step: actuator CLOSE / MIN / MAX 7. Bus setpoint: min...maxVRU-D3-BAC • en-us • 2022-04-06 • Subject to change7 / 15 Connection passive sensor (bus operation) 1) Resistance range 2) Resolution Compensation of the measured value is recommended Suitable for Ni1000 and Pt1000 Corresponding Belimo sensors 01DT-.. Connection of active sensor (bus operation) Possible input voltage range: DC 0...10 V (resolution 5 mV) Example: - Active temperature sensors - setpoint generator - humidity sensor Connection switching contact (bus operation) Requirements switching contact: The switch must be capable of switching a current of 10 mA @ 24 V cleanly. Example: - dP sensor - window contactVRU-D3-BAC • en-us • 2022-04-06 • Subject to change8 / 15VRU-D3-BAC • en-us • 2022-04-06 • Subject to change9 / 15Next >