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Table Of Contents

FANs 977, 1628.3

Product/Technical Bulletin VA-8020

Issue Date 0300

Part No. 34-636-372, Rev. B www.johnsoncontrols.com

Code No. LIT-977285

The VA-8020 synchronous motor-driven actuator

provides floating (three wire) control of valves with up

to 5/16 inch stroke in Heating, Ventilating, and Air

Conditioning (HVAC) applications. This compact,

non-spring return actuator has a 22 lb minimum

seating force in a compact, easy-to-install package.

The VA-8020 can be ordered factory coupled to

VB-5x39 Flare Valves or VG7000 Brass Trim Valves

for water service only. Refer to the appropriate valve

literature for available configurations.

Figure 1: VA-8020 Floating Valve Actuator

Features and Benefits

❑

Simplified Setup and

Adjustment Procedures

Reduces installation costs

❑ Compact Assembly Size

Fits most unit vent or baseboard applications

❑

Slotted Stem Valve

Provides ease of attachment

❑

Synchronous Motor

Meets a wide variety of small coil applications

VA-8020 Floating Valve Actuator

Summary of content (8 pages)

PAGE 1
FANs 977, 1628.3 Product/Technical Bulletin VA-8020 Issue Date 0300 VA-8020 Floating Valve Actuator The VA-8020 synchronous motor-driven actuator provides floating (three wire) control of valves with up to 5/16 inch stroke in Heating, Ventilating, and Air Conditioning (HVAC) applications. This compact, non-spring return actuator has a 22 lb minimum seating force in a compact, easy-to-install package.
PAGE 2
O peration The VA-8020 actuator accepts a 24 VAC signal from a compatible controller. The controller sends 24 VAC to either the up or down wires depending on the desired movement of the valve. This signal drives the actuator motor causing the valve stem to move in the desired direction for the application. When the controller stops sending a signal, the valve stem remains in position. The actuator uses a reversible synchronous motor to accurately position the valve.
PAGE 3
I nstallation IMPORTANT: M ounting Mount only on a valve that is piped within 90° of the vertical position, so dripping water is prevented from entering the actuator housing, since this could damage the actuator. Do not cover the actuator with thermal insulating material. Notes: Slotted stem VG7000 valves can only be ordered factory mounted to a VA-8020 actuator. No adaptor kits are available.
PAGE 4
3. For VT valves, thread the bonnet adaptor nut (included in the VA-8020-100 kit) onto the valve bonnet shown in Figure 5, and tighten with a wrench until it is snug. Packing Nut Bonnet Adaptor Nut 6. Place the stem retainer and coupling clip over the valve stem, so the lower (shorter) portion of the coupling clip is positioned in the locking groove on the valve stem as shown in Figure 6.
PAGE 5
W iring Input lines to the actuator must be wired correctly for the valve to move in the proper direction. (Refer to the specific controller wiring instructions as needed.) Wire the actuator as follows: ! CAUTION: IMPORTANT: Equipment Damage Hazard. Disconnect all power supplies before wiring connections are made or prior to performing maintenance. Check all wiring connections before applying power to the system.
PAGE 6
C ommissioning O rdering Information Field calibration of the force sensor is not required. Field repairs must not be made. To order a floating valve actuator, contact the nearest Johnson Controls representative and specify product code number VA-8020-1. If power is removed from the VA-8020, the actuator will remain in its intermediate position until the signal is applied again. Checkout Once wiring is complete: 1. Provide a 24 VAC control signal to white and red wires.
PAGE 7
Notes VA-8020 Floating Valve Actuator Product/Technical Bulletin 7
PAGE 8
S pecifications Product Power Requirements Input Signal Input Impedance 5/16 inch Stroke Time Shutoff Force VA-8020 Floating Valve Actuator 20 to 30 VAC at 50/60 Hz; 3.