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Honeywell VC7900 Series Product Data

Modulating control valves.
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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.
KT/RJ
12/97
© Honeywell Limited 1997
Modulating Control Valves
Form Number 95C-10830-2
VC7900 Series
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.
Specifications .......................................................... 2
Ordering Information ............................................... 2
Installation ................................................................... 4
Wiring ...................................................................... 5
Operation ................................................................ 5
Service .................................................................... 6
Check-out ................................................................ 6
PRODUCT DATA
CONTENTS

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Table of Contents

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   Summary of Contents for Honeywell VC7900 Series

  • Page 1: Table Of Contents

    In 2-way valves, flow can be in either direction. The VC7900 series valve actuator is used with any 0–10 Vdc or 2–10 Vdc controller. In 3-way valves, flow can be mixing or diverting.
  • Page 2: Specifications

    3. In U.S.A.: Honeywell, 1885 Douglas Drive North, Minneapolis, MN 55422-4386. 4. In Canada: Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, ON M1V 4Z9. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,...
  • Page 3 VC7900 Accessories and Replacement Parts: 40007029-002: Wrench for removing VC cartridge VCZZ1100: 2-way characterized cartridge, unit pack VCZZ6100: 3-way characterized cartridge, unit pack Fig. 1 - Nominal dimensions in inches and millimetres 94 [3-23/32] 68 [2-11/16] 68 [2-11/16] 94 [3-23/32] 90 [3-9/16] 90 [3-9/16] Table 3.
  • Page 4: Installation

    VC7900 - INSTALLATION INSTALLATION COMPRESSION MODELS WHEN INSTALLING THIS PRODUCT: For compression fitted models, tighten the compression nuts 1. Read these instructions carefully. Failure to follow them could enough to make a watertight seal. TAKE CARE NOT TO OVER damage the product or cause a hazardous condition. TIGHTEN.
  • Page 5: Wiring

    Fig. 6b - Wiring Colour Code for Cable Models and Fig. 8 - Wiring Schematic of the VC7900 Series Actuators 0 / 2 – 10 Vdc Controllers (Series 70). Brown...
  • Page 6: Service

    3. If the motor or other internal parts of the actuator is damaged, replace the entire actuator assembly. NOTE: Honeywell hydronic valves are designed and tested for silent operation in properly designed and installed systems. However, water noises may occur as a result of excessive water velocity.

This manual is also suitable for:

Vc7930Vc7931Vc7934

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