Technical Data2104Servicechilled, hot water, up to 60% glycolFlow CharacteristicA-port equal percentage, B-port modified for constant common port flowControllable Flow Range75°Size [mm]0.5” [15]End FittingNPT female endsBodyforged brass, nickel platedBallstainless steelStemstainless steelStem PackingEPDM (lubricated)SeatTeflon® PTFESeat O-ringEPDM (lubricated)Characterized DiscTEFZEL®Body Pressure Rating [psi]600Media Temperature Range (Water)0°F to 250°F [-18°C to 120°C]Max Differential Pressure (Water)50 psi (345 kPa)Close-Off Pressure200 psiCv0.46 Weight0.7 lb [0.3 kg]Leakage0% for A to AB, <2.0% for B to ABServicingmaintenance freeFlow PatternApplicationThis valve is typically used in air handling units on heating or cooling coils, and fan coil unit heating or cooling coils. Some other common applications include Unit Ventilators, VAV box re-heat coils and bypass loops. This valve is suitable for use in a hydronic system with variable or constant flow.Suitable Actuators Non-SpringSpringB308TR, LR, NRB(X)TFR, LFDimensions (Inches [mm])H1EFBADCH2LRB, LRXABCDEFH1H28.5” [216]2.4” [61]5.19” [132]4.61” [117]1.3” [33]1.18” [30]1.1” [28]B308, 3-Way, Characterized Control ValveStainless Steel Ball and Stem800-543-9038 USA866-805-7089 CANADA203-791-8396 LATIN AMERICA / CARIBBEANDate created, 10/27/2017 - Subject to change. © Belimo Aircontrols (USA), Inc.Dimensions (Inches [mm])H1EFBADCH2LRQB, LRQXABCDEFH1H28.9” [226]2.4” [61]5.74” [146]5.16” [131]1.58” [40]1.18” [30]1.3” [33]Dimensions (Inches [mm])BAEFDCLFABCDEF7.9” [201]2.4” [61]5.67” [144]5.09” [129]1.82” [46]1.89” [48]Dimensions (Inches [mm])ABDCEFTRABCDEF3.72” [94.5]2.4” [61]4.79” [122]4.21” [107]1.25” [32]1.2” [31]Dimensions (Inches [mm]) DCBAEFNRB N4, NRX N4ABCDEF11.36” [289]2.4” [61]7.25” [184]6.67” [169]3.15” [80]Dimensions (Inches [mm])BACDEFTFRB, TFRXABCDEF6.59” [167]2.4” [61]4.9” [124]4.32” [110]1.53” [38]1.2” [31]B308, 3-Way, Characterized Control ValveStainless Steel Ball and Stem800-543-9038 USA866-805-7089 CANADA203-791-8396 LATIN AMERICA / CARIBBEANDate created, 10/27/2017 - Subject to change. © Belimo Aircontrols (USA), Inc.Technical Data100146Power Supply24 VAC, ±20%, 50/60 Hz, 24 VDC, ±10%Power Consumption Running2.5 WPower Consumption Holding1 WTransformer Sizing4 VA (class 2 power source)Electrical Connection(2) 3ft [1m], 18 GA appliance cables with 1/2” conduit connectorsOverload Protectionelectronic throughout 0° to 95° rotationInput Impedance1000 Ω (0.6 W)Feedback Output UNo FeedbackAngle of RotationMax. 95°, 90°Direction of Rotation (Motor)reversible with built-in switchDirection of Rotation (Fail-Safe)reversible with CW/CCW mountingPosition Indicationvisual indicator, 0° to 95° (0° is full spring return position)Running Time (Motor)95 secRunning Time (Fail-Safe)<25 secAmbient Humiditymax. 95% RH non-condensingAmbient Temperature Range-22°F to 122°F [-30°C to 50°C]Storage Temperature Range-40°F to 176°F [-40°C to 80°C]HousingNEMA 2, IP42, UL Enclosure Type 2Housing MaterialUL94-5VAAgency Listings†cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. to 2004/108/EC and 2006/95/ECNoise Level (Motor)<35 dB (A) Noise Level (Fail-Safe)<62 dB (A) Servicingmaintenance freeQuality StandardISO 9001Weight1.8 lb [0.8 kg]Auxiliary switch1 x SPDT, 3A resistive (0.5A inductive) @ 250 VAC, adjustable 0° to 95°†Rated Impulse Voltage 800V, Type of action 1.AA, Control Pollution Degree 3TFRB24-3-SFloating Point, Spring Return, 24 V800-543-9038 USA866-805-7089 CANADA203-791-8396 LATIN AMERICA / CARIBBEANDate created, 11/30/2017 - Subject to change. © Belimo Aircontrols (USA), Inc.Wiring DiagramsINSTALLATION NOTESAActuators with appliance cables are numbered.Provide overload protection and disconnect as required.Actuators may be connected in parallel. Power consumption and input impedance must be observed.Actuators may also be powered by 24 VDC.Actuators Hot wire must be connected to the control board common. Only connect common to neg. (-) leg of control circuits. Terminal models (-T) have no-feedback.44One built-in auxiliary switch (1x SPDT), for end position indication, interlock control, fan startup, etc.Apply only AC line voltage or only UL-Class 2 voltage to the terminals of auxiliary switches. Mixed or combined operation of line voltage/safety extra low voltage is not allowed.Meets cULus requirements without the need of an electrical ground connection.!WARNING! LIVE ELECTRICAL COMPONENTS!During installation, testing, servicing and troubleshooting of this product, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury. Line Volts2318Blk (1)Red (2)Wht (3)Org CommonHot +W3 InputW4 Input 24 VAC Transformer1Floating Point ComHotLineVolts2318Blk (1)Red (2)Wht (3)Org CommonHot +W3 InputW4 Input 124 VAC TransformerFloating Point - Triac Source ComHotLineVolts2186Blk (1)Red (2)Wht (3)Org CommonHot +W3 InputW4 Input 24 VAC Transformer1Floating Point - Triac Sink S1S2S3NCNO0° to 95°144Auxiliary SwitchesTFRB24-3-SFloating Point, Spring Return, 24 V800-543-9038 USA866-805-7089 CANADA203-791-8396 LATIN AMERICA / CARIBBEANDate created, 11/30/2017 - Subject to change. © Belimo Aircontrols (USA), Inc.Next >