Product Overview

ManualsBrandsJohnson Controls ManualsDampersElectric Valve Actuator, Floating Control, 3-Wire, 24 Vac

Table Of Contents

14- 490- 2

Product Bulletin VA-8050

Issue Date February 2016

Part No.14-490-2, Rev. B

Code No. LIT-977300

VA-8050 Electric Valve Actuator

Floating Control, 50 lb. Force

The VA-8050 synchronous,

motor-driven actuator provides

floating control of valves with up

to 3/4 in. stroke in heating,

ventilating, and air conditioning

applications. This compact, non-

spring return actuator has a

50 lb. force and requires a

3-wire, 24 VAC signal from the

controller. The VA-8050 can be

ordered factory coupled to

VB Series valves. Refer to

AV-8050 bulletin for available

configurations.

Operation

A controller sends 24 VAC to the

up or down terminal on the

circuit board depending on the

desired movement of the valve.

This signal causes the motor to

rotate in the proper direction,

and through the lead screw and

lever, move the valve up or

down. When the controller stops

sending a signal, the valve

remains in place.

When the controller closes the

valve, a shutoff force will build

up. When this force reaches

50 lbs., the lever activates a

force sensor which stops the

motor. Field calibration of the

force sensor is not required. The

actuator maintains the shutoff

force even if power to the

controller is lost. When the

controller signals the valve to

move in the opposite direction,

the shutoff force will be reduced

and the valve will modulate.

Wiring

All wiring must be in accordance

with applicable electrical code

requirements. Input lines to the

actuator must be wired correctly

to the valve to move in the

proper direction. Wiring is to a

terminal strip labeled COM

(Common), UP and DOWN,

respectively.

Specifications

Fig. 1: VA-8050-1 Connected to VB-3754

Product VA-8050-1 Electric Valve Actuator Assemblies

Control Mode Floating Control, 3-Wire

Supply Voltage 24 VAC +6 V, -4 V, <200 mA, 50/60 Hz

Power Consumption 6 VA

Shutoff Force 50 lb. Force Minimum

Stroke Time 1/2 in. Stroke: Approx. 65 Sec

3/4 in. Stroke: Approx. 90 Sec

Ambient Operating 0 to 140°F (-18 to 60°C), 10 to 90% RH

Temperature Non-Condensing, 85°F Max Dew Point

Ambient Storage -40 to 150°F (-40 to 65°C)

Temperature

Media Water: 190°F (88°C)

Temperature Steam: 280°F (138°C)

VA-8000-101 Steam Insulator Kit

Accessories VA-8000-102 Valve Position Indicator Kit

VA-8000-104 Auxiliary Interface Board

The performance specifications are nominal and conform to acceptable industry standards. For application at conditions

beyond these specifications, consult the local Johnson Controls office. Johnson Controls, Inc. shall not be liable for damages

resulting from misapplication or misuse of its products.

Summary of content (5 pages)

PAGE 1
4- 490- 2, Rev. B Product Bulletin VA-8050 Issue Date February 2016 VA-8050 Electric Valve Actuator Floating Control, 50 lb. Force The VA-8050 synchronous, motor-driven actuator provides floating control of valves with up to 3/4 in. stroke in heating, ventilating, and air conditioning applications. This compact, nonspring return actuator has a 50 lb. force and requires a 3-wire, 24 VAC signal from the controller. The VA-8050 can be ordered factory coupled to VB Series valves.
PAGE 2
within 1/4 in. of the upper stop. Retrofit Installation ! CAUTION: Do not use on valves having a stroke over 3/4 in. Actuator travel over 3/4 in. will damage the actuator. ! 1. WARNING: Equipment Damage Hazard. Do not drive the VA-8050 actuator unless it is mounted to a valve. This can result in permanent damage to the actuator. Install the valve packing that is provided according to the instructions included with the parts. 4. Thread the 1/4 in.
PAGE 3
Repair Information Field repairs must not be made. For a replacement VA-8050, contact the nearest Johnson Controls branch office. Application and Drawing Identification 1 2 3 Fig. 3: Isometric Drawing Fig. 4: VA-8050-1 Dimensions in./mm. COM DOWN UP Washer Gage Upper Stop Limit Switches Gap Coupler Lever Plate Palnut Valve Stem Force Sensor Spring Plate Fig.
PAGE 4
FT B -B 0 X-1 120 VA C U nu se d TZ-5000 3 24 VAC U nu se d VA- 8050 Connected to VB-3754 U n use d U nu se d B0 FT B -B 0 B0 U nu se d X-2 U nu se d VA-8000-104 DWN COM UP DWN COM UP 3 U n use d U nu se d VA-8050 Connected to VB-3754 Fig. 6: Incremental Control from DSC-8500 Note: Hard ground cable shields to the wall of the DSC enclosure at the point of entry. The length of each shield inside the enclosure must be less than 2 in.
PAGE 5
European Single Point of Contact: JOHNSON CONTROLS WESTENDHOF 3 45143 ESSEN GERMANY Controls Group 507 E. Michigan Street P.O. Box 423 Milwaukee, WI 53202 NA/SA Single Point of Contact: JOHNSON CONTROLS 507 E MICHIGAN ST MILWAUKEE WI 53202 USA APAC Single Point of Contact: JOHNSON CONTROLS C/O CONTROLS PRODUCT MANAGEMENT NO. 22 BLOCK D NEW DISTRICT WUXI JIANGSU PROVINCE 214142 CHINA Printed in U.S.A.