Johnson Controls Automobile Parts VA 8051 User Manual

Valve and Actuator Manual 977  
Actuators and Positioners Section  
Product Bulletin VA-8051  
Issue Date 0988  
VA-8051 Electric Valve Actuator  
Floating Control, 50 lb. Force  
The VA-8051 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 is compatible  
with a 3-wire, 24 VAC signal.  
A ± 12 VDC signal from a  
DSC-8500 may be used with a  
VA-8000-104 drive card to  
position the VA-8051. A  
3400 ohm (nominal) position  
feedback potentiometer is also  
included for remote position  
indication to meters or a  
Fig. 1: VA-8051-1 Connected to VB-3754  
DSC-8500. The VA-8051 can be  
ordered factory coupled to  
VB Series Valves. See AV-8051  
bulletin for code numbers.  
The internal position feedback  
potentiometer is connected to  
the R, W, and S terminals.  
Specifically, the wiper is  
connected to W. The wiper will  
be at the R end when the  
actuator is retracted and at the  
S end when the actuator is fully  
stroked.  
Specifications  
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.  
Product  
VA-8051-1 Electric Valve Actuator  
Floating Control, 3-Wire  
Control Mode  
Supply Voltage  
Power Consumption  
Feedback  
24 VAC + 6 V, -4V, 200 mA, 50/60 Hz  
6 VA  
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.  
3400 Ohms ± 25%, 20 VDC Max Input Voltage  
50 lb. Force Minimum  
Shutoff Force  
Stroke Time  
1/2 in. Stroke: Approx. 65 Sec  
3/4 in. Stroke: Approx. 90 Sec  
Ambient Operating Temperature  
0 to 140°F (-18 to 60°C), 90% RH Max,  
85°F Max Dew Point  
Ambient Storage Temperature  
Media Temperature  
-40 to 150°F (-40 to 65°C)  
Water: 190°F (88°C)  
Steam (with Insulator Kit): 280 °F (138°C)  
VA-8000-101 Steam Insulator Kit  
VA-8000-102 Valve Position Indicator Kit  
VA-8000-104 Auxiliary Interface Board  
Accessories  
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.  
© 1988 Johnson Controls, Inc.  
Part No.14-548-9 Rev. A  
Code No. LIT-977305  
1
 
Wiring is to a terminal strip  
labeled DWN (Down), COM  
(Common) and UP,  
respectively. Wiring is to the  
terminals labeled R (Retracted  
end), W (Wiper), and S (Stroked  
end) for the feedback  
spring plate off the  
valve. Remove the  
spring compression  
tool if used.  
The coupler should thread  
down the stem until  
approximately 1/8 in. of  
thread remains between the  
coupler and the Palnut.  
f. Thread the lower spring  
plate up the  
centerpiece stuffing box  
to increase spacing  
between the spring  
potentiometer.  
(See Fig. 6).  
plate and the flat valve  
yoke mounting surface.  
Retrofit Installation  
2. Unpack the actuator and  
make sure the lever plate is  
within 1/4 in. of the upper  
stop.  
!
CAUTION:Do not use on  
valves having a stroke over  
3/4 in. Actuator travel over  
3/4 in. will damage the  
actuator.  
3. Install the valve packing  
that is provided according  
to the instructions included  
with the parts.  
!
WARNING:Equipment  
4. Thread the 1/4 in. Palnut,  
open side down, onto the  
valve stem and all the way  
to the end of the threads.  
Damage Hazard. Do not  
drive the VA-8051 actuator  
unless it is mounted to a  
valve. This can result in  
permanent damage to the  
actuator.  
5. Loosely install the actuator  
by sliding the actuator yoke  
between the spring plate  
and the yoke surface.  
1. Remove the V-3000  
actuator, upper spring plate  
and spring. (See Fig. 2).  
Finger tighten the plate to  
hold the actuator in place.  
(See Fig. 3).  
a. Disconnect the air line  
to the actuator.  
6. Obtain a source of 24 volt  
AC power. Wire a switch to  
allow control of the 24 volts  
AC to the DWN and COM  
terminals of the actuator.  
b. Remove the actuator  
by loosening the  
actuator set screw on  
the bottom of the lower  
diaphragm case. Lift  
the actuator off of the  
valve.  
7. Thread the coupler onto the  
valve stem while applying  
24 volts AC as necessary.  
c. Hold the stem  
extension firmly with a  
9/16 in. box-head  
wrench and with a  
small screwdriver,  
loosen the stem locking  
screw.  
d. For V-3000 valves,  
compress the spring  
using the X-200-8058  
spring compression  
tool. For V-3800  
valves, compress the  
spring with hand  
pressure.  
e. Using a 9/16 in. box-  
head wrench, unscrew  
the stem extension. Lift  
the spring and upper  
Fig. 2: Exposed V-3000 Actuator  
VA-8051 Product Bulletin  
3
 
8. Reverse the actuator and  
drive it up until it stops on  
the limit switch. Check to  
make sure the gap between  
the lever plate and the  
molded upper stop is  
1/16 in. (.047 to .093 in.).  
Set with flat washer gage  
supplied. (See Fig. 5).  
Repeat steps 6, 7 and 8  
until the gap falls into this  
range when the actuator  
stops.  
9. With the valve driven fully  
up to hold tension on the  
stem and coupler, thread  
the Palnut up the stem until  
it contacts the coupler.  
Tighten Palnut to coupler  
with 1/2 in. and 7/16 in.  
wrenches.  
10. Secure the actuator in place  
by tightening the spring  
plate with a large  
screwdriver.(See Fig. 3).  
11. Drive the actuator fully up  
and down at least three  
complete cycles before  
again checking that the  
lever and its drive coupler  
stop before contacting the  
upper stop and the lower  
end of the yoke casting.  
!
CAUTION:Use  
VA-8000-101 Insulator Kit  
for steam applications  
280°F (138°C) Maximum.  
4
VA-8051 Product Bulletin  
 
Repair Information  
Field repairs must not be made.  
For a replacement VA-8051,  
contact the nearest Johnson  
Controls branch office.  
Application and Drawing  
Identification  
Fig. 3: Isometric Drawing  
Fig. 4: VA-8051-1 Dimensions in./mm.  
Fig. 5: Internal View  
VA-8051 Product Bulletin  
5
 
Fig. 6: DSC-8500 Application Wiring  
(Incremental Control with Position Indication or Proportional Control)  
Controls Group  
507 E. Michigan Street  
P.O. Box 423  
Printed in U.S.A.  
Milwaukee, WI 53202  
6
VA-8051 Product Bulletin  
 

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