Installation / Operation Instruction Manual

BLP SERIES Install, Operation, and Maintenance Manual
SECTION 3: OPERATION AND CONTROLS
Rev-1 Bradford White • 200 Lafayette St. • Middleville, MI 49333 Page 23 of 83
BrutePlate Manual Phone: [phone] • Website: www.BradfordWhite.com 02/26/2020
3.5 3-Way Control Valve
Two types of 3-Way Control Valves are available, one with NPT connections of up to two inches
(2”) in size, and one with larger sized flanged connections. Both are shown in Figure 3-3.
FIGURE 3-3: 3-Way Control Valves with NPT (left) and Flange Connections (right)
3.5.1 Performance Data (3-Way Control Valve)
 BLP Series water heaters include MXG-461 3-Way Control Valve actuators.
 Control valve modulates the flow of boiler/HTHW through the heat exchanger based upon
the signal from the controller to maintain DHW supply temperature to target setpoint.
 Valve is fast positioning: < 2 seconds
 High rangeability: (1000:1)
 Low leakage rates: Leakage at ΔPv = 14.5 psi (0.1 Mpa) (1bar).
o A → AB Max. 0.02 % Cv (to IEC534-4).
o B → AB Depends on operating conditions (<0.2% Cv).
 Temperature of medium = 34°F to 266°F (1°C to 130°C)
 UL listed
 Before shipment, every unit is inspected to make sure the valve is opening and closing with
respect to signal from the controller.
 3-Way Control Valve is factory set to “Automatic” mode of operation.
 3-Way Control Valve is powered by 24VAC electricity.
 3-Way Control Valve is actuated by 4 to 20 mA signal from the controller.
o 4mA means valve is in fully bypass position (flow direction from port B to AB). Flow path
from A to AB is closed when valve is de-energized (fail safe feature).
o 20mA means valve is in full open position (flow direction from port A to AB)