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Table Of Contents

Product Bulletin VA-4233

Issue Date 11/01/01

Code No. LIT-977552 www.johnsoncontrols.com

VA-4233 Series

Electric Valve Actuators

VA-4233 Series Electric Valve Actuators use a stepper

motor to accurately position control valves in HVAC

applications. In the event of a power failure, a spring in

the actuator automatically returns the valve to the full

stem-up position. These direct-mount, spring return

electric actuators provide a minimum 61 lb (271 N)

force output for floating, on/off, or proportional control.

They can be easily field mounted or ordered factory

coupled to Johnson Controls 1/2 through 1-1/4 in.

VG7000 Series Bronze Control Valves, with no

additional linkage required.

The VA-4233 Series can also be field mounted to

select Invensys valves, using mounting kits available

from Johnson Controls. Proportional control models

include an AUTO stroke calibration feature that

eliminates the need for manual calibration or

adjustment after installation. Integral auxiliary switches

are available for indicating end stop position or to

perform switching functions. On proportional models,

position feedback is also available through a

proportional DC voltage signal. All models feature a

hand crank for manual positioning of the valve,

independent of a power supply.

Figure 1: VA-4233 Series Electric Valve Actuator

(Shown Mounted on a VG7000 Series

Bronze Control Valve)

Features and Benefits

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Designed for Use in Hot

Water, Chilled Water, and

Steam Applications

Allows for universal application

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Automatic Spring Return Returns the valve to the full stem-up position,

in the event of a power failure

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Simple No-Linkage

Mounting (All Models) with

AUTO Stroke Calibration at

Installation (VA-4233-GGx

Models Only)

Reduces installation time and cost

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Reversible Stroke Direction

(VA-4233-GGx Models Only)

Expands usability by allowing

switch-selectable direct or reverse action

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Optional Auxiliary Switches

Available

Provides adjustable switch points with line

voltage capability

Continued on next page . . .

Summary of content (8 pages)

PAGE 1
Product Bulletin VA-4233 Issue Date 11/01/01 VA-4233 Series Electric Valve Actuators VA-4233 Series Electric Valve Actuators use a stepper motor to accurately position control valves in HVAC applications. In the event of a power failure, a spring in the actuator automatically returns the valve to the full stem-up position. These direct-mount, spring return electric actuators provide a minimum 61 lb (271 N) force output for floating, on/off, or proportional control.
PAGE 2
Features and Benefits (Cont.
PAGE 3
Operation IMPORTANT: VA-4233-GGx Series Proportional Electric Valve Actuators VA-4233 Series Electric Valve Actuators are intended to control valves under normal operating conditions.
PAGE 4
Mounting Face View Side View Figure 2: Mounting Positions for Chilled Water Applications and Condensing Atmospheres Face View Side View Figure 3: Mounting Positions for Steam Applications 4 VA-4233 Series Electric Valve Actuators Product Bulletin Face View Side View Figure 4: Mounting Positions for Hot Water Applications
PAGE 5
Allow a minimum 1-1/2 in. (38 mm) top and side clearance for actuator removal. Access Door to Actuator Settings (Proportional Models Only) 4-3/32 (104)* 3-5/32 (80) * Add 1-17/32 in. (39 mm) for conduit adaptor on models with auxiliary switches.
PAGE 6
Stem Up White/Brown Stem Down Brown Yellow 20 to 30 VAC or 24 VDC ± 10% Common White Figure 6: VA-4233-AGx Wiring Diagram for Floating Control Yellow Stem Down Common White Figure 7: VA-4233-BGx Wiring Diagram for On/Off Control Output 20 VDC at 25 mA* Gray White/Red Red Feedback 0 (2) to 10 VDC or 6 to 9 VDC Input 0 (2) to 10 VDC, 6 to 9 VDC, or 0 (4) to 20 mA** Yellow White 20 to 30 VAC or 24 VDC ± 10% Common * Available on VA-4233-GGx-2MP models only.
PAGE 7
Technical Data Product VA-4233 Series Electric Valve Actuators Models Control Type Refer to Table 1.
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Technical Data (Cont.) Ambient Temperature Limits Operating 32 to 122°F (0 to 50°C) Storage -85 to 185°F (-65 to 85°C) Maximum Ambient Humidity Limits 90% RH Non-Condensing at 70°F (21°C) Ambient Temperature and 40°F (4°C) Fluid Temperature 35 to 250°F (2 to 121°C); 15 psig (103 kPa) Saturated Steam Fluid Temperature Limits (Actuator and Valve Assembly) Acoustic Noise Agency Compliance 35 dB(A) Maximum at 39 in.