VC7900 Series
Modulating Control Valves
GENERAL
The VC7900 Series Modulating Control Valves provide
precision flow control of hot or chilled water in various heating
and cooling applications.
The VC hydronic valve consists of a valve body and
replaceable characterized cartridge assembly. When used
with a Honeywell VC7900 actuator, the valve provides
proportional flow in modulating, diverting or mixing
applications. They are designed to operate silently and resist
water hammer. These actuators have conformally coated
printed circuit boards for humidity resistance.
VC7934 actuators meet the requirements of UL94-5V fire
retardancy for mounting in return air plenums.
The VC7900 series valve actuator is used with any
0–10 Vdc or 2–10 Vdc controller.
PRODUCT DATA
FEATURES
•
All actuators are interchangeable and suitable for all valves,
1/2" through 1", providing maximum installation flexibility
with minimum stock.
•
Replaceable cartridge provides easy valve serviceability
without plumbing.
•
High close-off pressure rating is suitable for open systems
and hydronic HVAC systems with temporary high head
pressure.
•
Actuator is constructed of moisture and humidity resistant
materials.
•
Motor de-energiszes when valve not in motion, extending
service life.
•
Manual opener and position indicator. This "manual opener"
may be used for filling, venting, and draining the system.
•
Twist-lock actuator can be installed after plumbing work has
been completed, which makes for more efficient on-site
installation. Multi-directional actuator mount allows for 4
different wiring orientations, thus providing ease of wiring
and service.
•
Body dimensions are comparable to existing Honeywell
products (V4043/4044 and V8043/8044), and in most cases
can be interchanged.
•
Sweat-fitted valves are supplied with the cartridge loose, to
facilitate soldering operations (an installation tool is in
cluded).
•
In this balanced valve design, the internal piston moves up
and down across the water flow. The actuator provides
sinusoidal piston travel action for "soft shut-off" and open, to
eliminate water hammer in most applications.
•
In 2-way valves, flow can be in either direction.
•
In 3-way valves, flow can be mixing or diverting.
CONTENTS
Specifications .......................................................... 2
Ordering Information ............................................... 2
Installation ................................................................... 4
Wiring ...................................................................... 5
Operation ................................................................ 5
Service .................................................................... 6
Check-out ................................................................ 6
KT/RJ
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12/97
•
© Honeywell Limited 1997
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Form Number 95C-10830-2