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Table Of Contents

FANs 977, 1628.3

Product/Technical Bulletin VA-8122

Issue Date 0300

Part No. 14-1213-8, Rev. — www.johnsoncontrols.com

Code No. LIT-977380

The VA-8122 Proportional Valve Actuator is an electric

actuator that provides proportional control of valves

with up to a 5/16 in. 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-8122 can be ordered factory coupled to the

1/2 in. or 3/4 in. VG7000 Series bronze valves for hot

or cold water service only. The VA-8122 can be used

for retrofits of VT Series Terminal Unit Valves (with

slotted stems) and VB-5x39 Series Flare Valves.

Refer to the appropriate valve literature for more

information.

Figure 1: VA-8122-1 Valve Actuator

Features and Benefits

❑

AUTOCAL Pushbutton

Allows the actuator to define the control input

range proportionally over the stroke

❑

Simplified Setup and

Adjustment Procedures

Reduces installation costs

❑

Selectable Direction of

Action, Drive Down (DD) or

Drive Up (DU)

Provides application flexibility

❑

Wide Range of Control

Inputs (Voltage and

Current)

Meets the needs of most applications

❑

Power Failure Detection;

Low Voltage Indication

Prevents data corruption of the actuator’s

memory and warns of insufficient supply

voltage

❑

Light-Emitting Diode (LED)

Reduces commissioning time and displays

operating status

VA-8122 Proportional Valve Actuator

Summary of content (8 pages)

PAGE 1
FANs 977, 1628.3 Product/Technical Bulletin VA-8122 Issue Date 0300 VA-8122 Proportional Valve Actuator The VA-8122 Proportional Valve Actuator is an electric actuator that provides proportional control of valves with up to a 5/16 in. 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-8122 can be ordered factory coupled to the 1/2 in. or 3/4 in.
PAGE 2
O peration D imensions The actuator uses a reversible synchronous motor to accurately position the valve. The motor can reliably generate 22 pounds of force in either the Drive Down (DD) or Drive Up (DU) direction. See Figure 3 for actuator dimensions. 0.87 22.2 5.00 127.0 0.50* 12.7 Once the valve closes, a shutoff force builds up. When this force reaches 22 pounds, a lever within the actuator operates a force sensor that stops the motor.
PAGE 3
M ounting IMPORTANT: Note: Do not use on valves having a stroke over 5/16 in. Travel beyond 5/16 in. will damage the actuator or prevent complete shutoff. In horizontal piping applications, it is recommended that the valve be mounted within 85° of the upright position. When mounted in vertical piping, the valve must be protected from moisture. Unpack the actuator and proceed as follows: 1. Remove the actuator cover by pressing inward on the plastic tabs while sliding the cover up and forward. 4.
PAGE 4
C alibration The actuator drives in proportion to the amount of change in the input control signal. It accepts the input control signal ranges by means of jumpers. Electrical connections for the control input are made via spade terminals that are mounted on the circuit board located under the actuator’s cover. (Refer to Figure 2 for the location of the calibration components.) Jumpers The type of input control signal is determined by the position of Jumper W1.
PAGE 5
Direction of Action Auto Calibration The actuator’s direction of action is selected with Jumper W2. (See Figure 3.) The action of the actuator can be reversed by moving Jumper W2 on the circuit board. When Jumper W2 is in the DD position (factory setting), a low control input signal will cause the actuator lever arm to move to the highest position (valve stem up). A high control input signal will cause the actuator lever arm to move to the lowest position (valve stem down).
PAGE 6
W iring ! 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. Short-circuited or improperly connected wires will result in permanent damage to the equipment. CAUTION: IMPORTANT: Make all wiring connections in accordance with the National Electrical Code and local regulations.
PAGE 7
O rdering Information Field repairs must not be made. To order a proportional valve actuator, contact the nearest Johnson Controls representative and specify product code number VA-8122-1. Table 5: Accessories Product Code Number Description VA-8020-100 Mounting kit for VT Series valves Actuator Combinations VA-8020-601 Replacement cover only The VA-8122-1 is available factory coupled to 1/2 in. or 3/4 in. VG7000 Series bronze valves.
PAGE 8
S pecifications Product VA-8122 Proportional Valve Actuator Power Requirements 24 VAC at 50/60 Hz, 5.0 VA supply minimum, Class 2 Input Signal Jumper Selectable: 0 (2) to 10 VDC, 0 (4) to 20 VDC, 6 (12) to 9 (18) VDC, 0 (4) to 20 mA Factory Setting: 0 to 10 VDC, Drive Down (DD) action on signal increase Input Impedance Voltage Input: Current Input: 0 to 10 VDC, 150,000 ohms and 0 to 20 VDC, 450,000 ohms 0 to 20 mA, 500 ohms 5/16 in.