Johnson Controls VA78*0-HG*-2 Series, VA7810-HG*-2 Series, VA7830-HG*-2 Series, VA7810-AD*-2 Series, VA7810-AG*-2 Series Product Bulletin

Figure 1: VA7800 Actuator

VA7800 Series Electric Valve Actuators

Product Bulletin

VA7800 Series

Refer to the QuickLIT website for the most up-to-date version of this document.

The VA7800 Series of Electric Valve Actuators control
VG7000 Series Bronze Globe Valves in Heating,
Ventilating, an d Air Conditioning (HVAC) systems. The
V A7800 Series produces a minimum linea r output force
of 180 lb (800 N) and is ordered field mounted or
factory coupled to 1 in. and 2 in. VG7000 Series
Bronze Globe Valves with brass trim and to 1/2 in.
through 2in. VG7000 Series Bronze Globe Valves with
stainless steel trim. All actuators are direct mount and
available in both Spring Return and Non-Spri ng Return
models.

Spring Return models ship from the factory set for
DC 0 to 10 V Proportional Control. With a change of
DIP switch settings, this model can be field configured
to On/Off or Floating Control. In addition to these
settings, optional auxiliary switches are also available.

Code No. LIT-12011474

Issued June 2018

Non-Spring Return models are available in AC 24 V
On/Off (Floating) Control, or DC 0 to 10 V Proportional
Control. Models are available with or without optional
auxiliary switches.

Table 1: Features and Benefits

Features Benefits

Automatic Stroke Adjustment Provides easy, quick, and precise commissioning.
Manual Override as Standard Allows manual positioning of valve for easy commissioning and servicing.
NEMA 2 (IP54) Enclosure Protection Allows installation in a wide range of environments.
Unique Swing-Gate Yoke Offers fast and secure attachment to the valve.
Brushless Motor Ensures low energy consumption and long life.
Proportional Model Enables one model to be used for various control types.
Force-Controlled Motor Shut-Off Reduces energy consumption, wear of the actuator, and protects the valve from

excessive forces.

Stroke Position Indicator Gives visual indication of valve operation, provides automatic adjustment of

Status Light-Emitting Diode (LED) Gives visual indication of actuator status and assists with diagnostic.
Optional Integrated Auxiliary Switches Provides adjustable switch points with line voltage capability.
Integral Cable with Colored Conductors Simplifies installation and field wiring.
Integral Connector for 3/8 in. (10 mm)

Flexible Metal Conduit (FMC)
Underwriters Laboratories Inc.® (UL)

and CE Compliant

stroke indicators during first cycle of operation.

Simplifies installation and field wiring.

Provides internationally recognized regulatory agency approval.

VA7800 Series Electric Valve Actuators Product Bulletin

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Application Overview

IMPORTANT: The VA7800 Series Electric Valve

Actuators are intended to control saturated steam,
hot water, and chilled water flow under normal
equipment operating conditions. Where failure or
malfunction of the VA7800 Series Valve Actuator
could lead to personal injury or property damage to
the controlled equipment or other property,
additional precautions must be designed into the
control system. Incorporate and maintain other
devices, such as supervisory or alarm systems or
safety or limit controls, intended to warn o f or protect
against failure or malfunction of the VA7800 Series
V alve Actuator .

VA7810-Axx-2 Series Non-Spring Return On/ Off and Floating Point Actuator

The VA7810-AGx-2 Series Non-Spring Return
Actuators provide fail-in-place on/off or modulating
control of valves in HVAC systems. On/Off Control is
provided from a manual switch, an auxiliary switch from
a pump contactor, or a similar device. Floating Point
Control is provided from a triac or relay.

VA7810-HGx-2 Series Non-Spring Return Proportional Actuator

The VA7810-HGx-2 Series Non-Spring Return
Actuators offer fail-in-place proportional control of
valves in HVAC systems regulated by an electronic
controller . These a ctuators are configured for response
to 0 to 10 VDC, 2 to 10 VDC, 0 to 20 mA, or 4 to 20 mA.
The VA7810-HGx-2 Series can also be custom
configured for valve sequencing. The minimum setpo int
is 0 to 6 VDC (0 to 12 mA), and maximum input signal
is 3 to 10 VDC (6 to 20 mA). A
0 to 10 VDC, or 2 to 10 VDC feedback signal is
available for position indication. The actuator features a
preset actuator position with a stem that extends or
retracts on loss of signal. However, when you select
current input, this stem feature is not available.

VA7820-HGx-2/VA7830-HGx-2 Series Spring Return Proportional Actuator

The VA7820-HGx-2 and VA7830-HGx-2 Series
Actuators are Spring Return actuators that provide
fail-safe proportional control of valves in HV AC systems
regulated by an electronic controller. In the event of
power loss, the V A7820 -HGx-2 Series Actuators spring
return with the actuator stem fully retracted and the
valve stem in the full up position. On loss of power, the
VA7830-HGx-2 Series Actuators spring return with the
actuator stem fully extended and the valve stem in the
full down position.

These actuators are configured for response to 0 to
10 VDC, 2 to 10 VDC, 0 to 20 mA, or 4 to 20 mA. Both
models of actuators can also be custom configured for
valve sequencing. Minimum setpoint is 0 to 6 VDC (0 to
12 mA) and maximum input signal is 3 to 10 VDC (6 to
20 mA). A 0 to 10, or 2 to 10 VDC feedback signal is
available for position indication. The actuator s feature a
preset actuator position with a stem that extends or
retracts, on loss of signal. When current input is
selected, this stem feature is not available.

Operation

The VA7800 Series of actuators offers up to 1 in.
(25 mm) of linear stroke for the operation of
Johnson Controls® VG7000 Series Bronze Control
Valves. The actuators interface to all threaded stem
VG7000 Valves

trim VG7000 series valves from 1/2 in. to 2 in. The
actuator should not be used on brass trim VG7000
series valves from 1/2 in. to 3/4 in.

be manually positioned by means of a 5 mm Allen
wrench.

For non-spring return actuators, engage manual
operation by inserting the Allen wrench into the
hexagonal socket and pushing down to cut off the
power to the motor. Turn the Allen wrench clockwise to
extend the actuator stem; turn the wrench
counterclockwise to retract the actuator stem.

For spring return actuators, manual operation requires
that the power be disconnected. On loss of power, the
actuator spring force moves the stem to its fail-safe
position. For manual operation, insert the Allen wrench
into the hexagonal socket and turn the wrench either
clockwise or counterclockwise depending on the
actuator model. When you reach the desired stem
position, push the wrench down and slightly rotate the
wrench in the opposite direction to lock it in position.
When power resumes, the actuator is released from its
manual position.

Note: After using manual control to position the
actuator, it is recommended that a self-calibration cycle
be performed to assure proper operation.

VA7810-AGx-2 Series Non-Spring Return On/ Off and Floating Point Actuator

The VA7810-AGx-2 Series Non-Spring Return
Actuators are offered with On/Off Control or Floating
Control. Select these controls by applying power to
different terminals located on the actuator. For a more
detailed procedure, refer to the appropriate installation
instructions for the actuator.

and can be used on all stainless steel

All actuators can

VA7800 Series Electric Valve Actuators Product Bulletin

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For On/Off Control, apply power continuously to
Terminal 1 (Common) and Terminal 2 (Power). From
this action, the actuator assumes its fully extended
stem position. To fully retract the stem, apply power
through the controlling device to Terminal 3. When
power is removed from Terminal 3, the actuator returns
to its fully extended position. In the event of power loss,
the actuator remains in its last position.

To enable Floating Control, wire Terminal 1 to the
common. Apply power to Terminal 2 to extend the
actuator stem, or to Terminal 3 to retract the actuator
stem. If power is removed from Terminal 2 and
Terminal 3, or in the event of complete power loss, the
actuator remains in its last position.

VA78x0-HGx-2 Series Proportional Control Actuators

The VA78x0-HGx Series Actuators operate with
Proportional Control, On/Off Control, or Floating
Control. Changes in DIP switch settings allow the
selection of Control Type, Input Signal, Input Range,
Action, actuator position at signal loss, and stroke
speed. See Table 2 for a detailed reference of DIP
switch settings.

Table 2: VA78x0-HGx-2 Series Proportional

Control Actuators DIP Switch Settings
(Part 1 of 2)

DIP Switch
Number

1 Control Type ON Floating/on/off control

2 Input Signal ON Current input signal

3 Input Signal

4 ON 2 to 10 V (4 to 20 mA)

5 Action ON Reverse

Description State

OFF Proportional control

OFF Voltage input signal
ON Custom setting

Range

OFF Pre-defined setti ng

OFF 0 to 10 V (0 to 20 mA)

OFF Direct

Table 2: VA78x0-HGx-2 Series Proportional

Control Actuators DIP Switch Settings
(Part 2 of 2)

DIP Switch
Number

6 Preset

7 Stroke

8 Not Used Not Used

1. Control signal loss position preset does not operate when
you select 0 to 20 mA or custom input range control.

Description State

ON Actuator Stem
Actuator
Position at
Signal Loss

Speed

OFF Actuator Stem

1

ON 76 s/in. (3 s/mm)

OFF 152 s/in. (6 s/mm)

Extends

Retracts

The VA78x0-HGx Series Actuators are a direct acting
and factory supplied set for 0 to 10 VDC Proportional
Control. Field setting options exist for standard ranges
of 0 to 20 VDC (0 to 20 mA) or 2 to 10 VDC (4 to
20 mA) control in the field. At the end of a span, the
actuator control signal has a buffer zone of 0.3 V
(0.6 mA) to ensure definite valve close-off.

You can set the actuators for custom signal ranges.
Minimum setpoint is 0 to 6 VDC (0 to 12 mA) and
maximum input signal is 3 to 10 VDC (6 to 20 mA).
Position feedback signal is also available in Table 3.

Table 3: Position Feedback Signal for

VA78x0-HGx-2 Series Proportional
Control Actuators

Input Signal Feedback Output

0 to 10 VDC 0 to 10 VDC
2 to 10 VDC 2 to 10 VDC
0 to 20 mA 0 to 10 VDC
4 to 20 mA 2 to 10 VDC
Custom Range 0 to 10 VDC

VA7800 Series Electric Valve Actuators Product Bulletin

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All VA78x0-HGx-2 Series Actuators feature a

Figure 2: VA7810-Axx-2 Wiring Diagram

VA7810-AGx-2 Wired

as Floating

VA7810-AGx-2 Wired

as OPEN/CLOSE

VA7810-ADx-2 Wired

as Floating

VA7810-ADx-2 Wired

as OPEN/CLOSE

VA7810-AxC-2

Auxiliary Switches Wiring

multicolored LED that provides operational status and
failure analysis information. See Table 4 for a detailed
description of LED color indicators.

Table 4: VA78x0-HGx-2 Series Actuators LED Status and Color Indicators

LED Color

Status Green Yellow Red

Off Power off
Blink Motor running Power on after a black-out

Temporary fault, possible valve

2

sticking

Fast Blink Calibrating Input signal failure
Continuous

On

1. After re aching both ends of the stroke, the input signal is recalibrated and the LED switches to green.

2. The actuato r leaves this mode only if the push button is pressed for at least 5 seconds, and the previously detected error
has been resolved.

3. This status is temporary. When the detected temperature decreases to the acceptable range, the LED switches back to
green.

Power on, motor not running Custom calibration value out of

range

1

High temperature

Generic fault

3

The actuator microprocessor carries out a failure
diagnosis when a failure has been detected. The
colored LED indicates the actuator status. When the
microprocessor dete cts that the stem has come to an
unexpected stop, it initiates a retry cycle. The retry
cycle repeats three times, and if unsuccessful, the
actuator switches to fault mode and the LED flashes
yellow. If the problem is cleare d, the actuator continu es
to function normally.

The LED also flashes yellow when power resumes
after a power loss. The LED continues to flash yellow
until the end stop is achieved or a recalibration process
is manually started.

Wiring Diagrams

Figure 2 and Figure 3 show detailed diagrams for the
wiring configurations of the VA7800 Series Electric
Valve Actuators.

VA7800 Series Electric Valve Actuators Product Bulletin

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FIG:W IR10_a xx