Honeywell VRW2 Quick Start Manual

VRW2 Dynamic Pressure-
Regulating Flanged Control Valves
APPLICATION
The VRW2 two-way dynamic pressure-regulating control
valves maintain constant flow of hot and chilled water in
closed-loop heating, ventilating, and air conditioning (HVAC)
systems regardless of head pressure fluctuations above
minimum specified pressure drop. These valves come
complete with proportional, stay-in-place or electronic fail-safe
actuators.
The built-in differential pressure regulator makes fluid flow
through the valve independent of changes in supply pressure,
eliminating "hunting" by the control system, even at low coil
flow. The pressure regulator virtually eliminates cavitation in
the valve, and decouples the control valve from the effects of
piping components such as reducers and elbows.
Pressure independent control valves are sized to match
design coil flow regardless of coil size. VRW2 valves eliminate
the need to balance the system for proper flow, and allow
chillers to be operated at design temperature differential for
maximum efficiency at every load condition. When used in a
system with variable speed pump drives, 3-way valves and
coil bypass lines are not required.
Systems that utilize the capabilities of properly installed and
adjusted pressure-independent control valves may qualify for
LEED points.
FEATURES
• Multi-sized bodies from 2½ to 6 inch pipes with wafer-
flanged connections.
• Combination ANSI/ASME Class 150/300 pressure
rating.
• Controls hot or chilled water with up to 50% glycol.
• Regulated flow rates available from 39 to 469 gpm.
• Stainless steel pressure regulator maintains constant
pressure drop across valve seat.
• Positive pressure, rolling diaphragm regulator design
for long service life provides flow control accuracy of
±5%.
• Equal percentage flow characteristic using multi-turn,
non-rising, characterized plug.
• High close-off rating.
• 50 discrete, selectable flow rates available per valve
size.
• Stainless steel trim.
• Six-turn actuator with floating or modulating inputs
available with stay-in-place or electronic fail-safe
action.
• Fail-safe actuators field-configurable for normally
open or normally closed power failure return position.
• Two Test Ports for venting or pressure gauge
attachment.
Application ........................................................................
Features ...........................................................................
Specifications ...................................................................
Ordering Information ........................................................
Installation ........................................................................
Operation and Checkout ..................................................
TYPICAL SPECIFICATIONS ............................................ 10
PRODUCT DATA
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