Honeywell VRN2BBSA0000 Instrucciones Para La Instalación

VRN Dynamic Pressure-Regulating
Control Valves and Actuators
APPLICATION
The VRN2 two-way dynamic pressure-regulating control valves
maintain constant flow of hot or chilled water with glycol solutions
up to 50% in closed-loop heating, ventilating, and air conditioning
(HVAC Division 23) systems regardless of head pressure
fluctuations above the minimum specified pressure drop.
These valve assemblies can be ordered with or without
factory-mounted fail in place or fail safe actuators.
Application Notes
IMPORTANT
Valve sizing is important for correct system
operation. Undersized valves do not have sufficient
capacity at maximum load. Oversized valves do not
have sufficient authority over the load in modulating
applications.
Oversized valves can cause excessive cycling and
the seat and ball can be damaged because of the
restricted opening.
Proper Use
These valves are only for use in cold, warm, and hot water
systems. Not suitable for oil, combustible gases, or steam.
They are designed for a medium temperature range of from 35
to 250°F, at a maximum pressure of 360 psig VRN valves are
to be operated with the appropriate Honeywell direct coupled
actuators only.
INSTALLATION INSTRUCTIONS
Water should be properly filtered, treated and conditioned
according to local conditions and the recommendations of the
boiler or chiller manufacturers. The installation of a strainers
and filters is recommended.
IMPORTANT
The presence of excessive iron oxide (red rust) in the
system voids the valve warranty.
Effective Flow Rate
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. VRN2 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. In new construction, VRN2
valves perform better than reverse return piping designs
without the extra materials these systems need. Pressure-
independent control requires less flow, enabling use of smaller
piping, pumps, and chillers.
Flow Characteristics
The VRN2 two-way dynamic pressure-regulating control
valves have:
• an equal percentage flow characteristic with characterized
flow control insert.
Required Operating Torque
Both Honeywell fail in place and fail-safe low torque direct
coupled actuators can be utilized with the VRN valves. VRN
valves use a patented seat design that reduces the torque
needed from the actuator. A 35 lb-in. DCA provides sufficient
torque to close the valve at rated close-off. (See Table 1.)
These ratings exceed most HVAC application requirements.
Table 1. Close-off, Differential Pressure Ratings.
Valve Type Valve Size
2 way 1/2 in., 3/4 in.
1 in., 1-1/4 in., 1-1/2 in.
Close-off Pressure
Rating (psi)
100
100
38-00005EFS-02