Johnson Controls VA-8052 User manual

Brand: Johnson Controls

Model: VA-8052

Type: User manual

Valve and Actuator Manual 977

Actuators and Positioners Product Information Section

Technical Bulletin VA-8052

Issue Date 0489

Part No. 14-761-0, Rev. --

Code No. LIT-977310x

VA-8052 Electric Valve Actuator

Installation & Calibration

The VA-8052-1 motor-driven

actuator provides proportional

control of valves with up to

3/4 in. lift in heating, ventilating,

and air conditioning

applications. This non-spring

return actuator has a 50 lb force

and requires a two-wire, voltage

signal (usually 0 to 10 VDC)

from the controller, and 24 VAC

power.

Installation

WARNING: Equipment

Damage Hazard. Do not

drive the VA-8052 actuator

unless it is mounted to a

valve. This can result in

permanent damage to the

actuator.

Installation of VA-8052-1 on

1/4 in. and 1/2 in. Stroke Valves

1. Unpack the VA-8052

Actuator and insure that the

feedback potentiometer

plunger is on top of the

coupler arm.

2. Install the valve packing

that is provided according

to the instructions included

with it.

3. Thread the 1/4 in. Palnut,

open side down, all the way

onto the valve stem.

4. Loosely install the actuator

by sliding the actuator yoke

between the spring plate

and valve centerpiece

surface. Finger tighten the

spring plate to hold the

actuator in place (see

Fig. 1).

5. Obtain a source of 24 VAC

power and wire to the AC

and COM terminals. Wire a

source of 0 to 10 VDC to

the IN and COM terminals

(see Fig. 4). Check to see

that the stroke

potentiometer is fully CCW

(see Fig. 1).

6. Thread the knurled coupler

onto the valve stem until

approximately 1/4 in. of

thread remains between the

knurled coupler and the

Palnut. Note: It may be

necessary to pull the valve

stem up to meet the coupler

or to apply 0 to 10 VDC to

position the coupler above

the valve stem.

7. Secure the actuator in place

by tightening the spring

plate with a large

screwdriver (see Fig. 2).

8. Stroke the actuator to the

stem-up position by

applying 0 VDC. Thread

the knurled coupler onto the

valve stem until the knurled

coupler fits snugly.

9. Increase the signal slightly

(to 3 to 4 VDC) so that tension

on the coupler is relieved.

When lever stops moving,

thread the knurled coupler

on another 1 to 1-1/4 turn.

10. Reduce the signal to zero to

stroke the actuator to the

stem-up position. The limit

switch should click softly at

the full stem-up position. If

not, repeat step 9.

11. With the valve driven fully

up, thread the Palnut up the

stem until it contacts the

coupler. Tighten the Palnut

with a 7/16 in. wrench while

holding the nut on top of the

coupler with a 1/2 in.

wrench.

12. Provide an input signal of

10 VDC to the actuator.

After the actuator strokes

completely to the stem-

down position, slowly adjust

the stroke potentiometer

CW until the stem just

begins to move up. Then

adjust the stroke

potentiometer CCW until

the stem strokes down and

the limit switch clicks. Turn

the stroke adjustment an

additional 1/8 rotation CCW

to assure positive full

stroke.

2 VA-8052 Technical Bulletin

13. Drive the actuator fully up

and down at least three

complete cycles (by

alternately applying 0 and

10 VDC), checking to see

that the upper and lower

limit switches click. Note:

The lever plate must not

contact the upper stop and

the drive coupler must not

contact the bottom surface

of the actuator yoke (see

Fig. 1).

Installation of VA-8052-1 on

3/4 in. Stroke, 2-Way Push

Down to Open (PDO) Valves

1 . Unpack the VA-8052

Actuator and insure that the

feedback potentiometer

plunger is on top of the

coupler arm.

2. Install the valve packing

that is provided according

to the instructions included

with it.

3. Thread the 1/4 in. Palnut,

open side down, onto the

valve stem and all the way

to the end of the threads.

4. Loosely install the actuator

by sliding the actuator yoke

between the spring plate

and valve centerpiece

surface. Finger tighten the

spring plate to hold the

actuator in place (see

Fig. 1).

5. Obtain a source of 24 VAC

power and wire to the AC

and COM terminals (see

Fig. 4). Wire a source of 0

to 10 VDC to the IN and

COM terminals. Check to

see that the stroke

potentiometer is fully CCW

(see Fig. 1).

6. Thread the knurled coupler

onto the valve stem until

approximately 1/4 in. of

thread remains between the

knurled coupler and the

Palnut. Note: It may be

necessary to pull the valve

stem up to meet the coupler

or to apply 0 to 10 VDC to

position the coupler above

the valve stem.

7. Secure the actuator in place

by tightening the spring

plate with a large

screwdriver (see Fig. 2).

8. Stroke the actuator to the

stem-up position by

applying 0 VDC. Thread

the knurled coupler onto the

valve stem until the knurled

coupler fits snugly.

9. Increase the signal slightly

(to 3 to 4 VDC) so that

tension on the knurled

coupler is relieved. When

the lever stops moving,

thread the knurled coupler

on another 1 to 1-1/4 turn.

10. Reduce the signal to zero to

stroke the actuator to the

stem-up position. The limit

switch should click softly at

the full stem-up position. If

not, repeat step 9.

11. With the valve driven fully

up, thread the Palnut up the

stem until it contacts the

coupler. Tighten the Palnut

with a 7/16 in. wrench while

holding the nut on top of the

coupler with a 1/2 in. wrench.

12. Drive the actuator fully up

and down at least three

complete cycles, (by

alternately applying 0 and

10 VDC) checking to see

that the upper limit switch

clicks. Note: The lever

Fig. 2: Isometric Drawing of VA-8052

Fig. 3: Internal View of V-3000 Actuator

VA-8052 Technical Bulletin 3

plate must not contact the

upper stop and the drive

coupler must not contact

the bottom surface of the

actuator yoke (see Fig. 1).

Installation of VA-8052-1 on

3/4 in. Stroke 2-Way, Push

Down to Close (PDC) Valves

1. Unpack the VA-8052

Actuator and insure that the

feedback potentiometer

plunger is on top of the

coupler arm.

2. Install the valve packing

that is provided according

to the instructions included

with it.

3. Thread the 1/4 in. Palnut,

open side down, onto the

valve stem and all the way

to the end of the threads.

4. Loosely install the actuator

by sliding the actuator yoke

between the spring plate

and valve centerpiece

surface. Finger tighten the

spring plate to hold the

actuator in place (see Fig. 1).

4 VA-8052 Technical Bulletin

5. Obtain a source of 24 VAC

power and wire to the AC

and COM terminals. Wire a

source of 0 to 10 VDC to

the IN and COM terminals

(see Fig. 4). Check to see

that the stroke potentiometer is

fully CCW (see Fig. 1).

6. Thread the knurled coupler

onto the valve stem until

approximately 1/8 in. of

thread remains between the

knurled coupler and the

Palnut. Note: It may be

necessary to pull the valve

stem up to meet the coupler

or to apply 0 to 10 VDC to

position the coupler above the

valve stem.

7. Secure the actuator in place

by tightening the spring

plate with a large

screwdriver (see Fig. 2).

8. Stroke the actuator to the

stem-down position by

applying 10 VDC. Unthread

the knurled coupler CCW

on the valve stem until the

knurled coupler fits snugly.

9. Decrease the signal slightly

(to 6 to 7 VDC) so that

compression on the coupler

is relieved. When the lever

stops moving, unthread the

knurled coupler another 2 to

3 turns.

10. Increase the signal to

10 VDC to stroke the

actuator to the stem-down

position. The limit switch

should click at the full stem-

down position. If the switch

does not click, repeat

step 9.

11. With the valve driven fully

down, thread the Palnut up

the stem until it contacts the

coupler. Tighten the Palnut

with a 7/16 in. wrench while

holding the nut on top of the

coupler with a 1/2 in.

wrench.

12. Drive the actuator fully up

and down at least three

complete cycles, checking

to see that the lower limit

switch clicks. Note: The

lever plate must not contact

the upper stop and the drive

coupler must not contact

the bottom surface of the

actuator yoke (see Fig. 1).

Retrofit

To remove the V-3000 actuator,

upper spring plate, and spring,

refer to Fig. 3 and proceed as

follows:

1. Disconnect the air line to

the actuator.

2. Remove the actuator by

loosening the actuator set

screw on the bottom of the

lower diaphragm case. Lift

the actuator off of the valve.

3. Hold the stem extension

firmly with a 9/16 in. box-

head wrench and, with a

small screw driver, loosen

the stem locking screw.

4. For V-3000 Series Valves,

compress the spring using

the JC 5389 Spring

Compression Tool. For

V-3800 Series Valves,

compress the spring with

hand pressure.

5. Using a 9/16 in. box-head

wrench, unscrew the stem

extension. Lift the spring

and upper spring plate off of

the valve. Remove the spring

compression tool if used.

6. Thread the lower spring

plate up the centerpiece

stuffing box to increase

spacing between the spring

plate and the valve center-

piece mounting surface.

Calibration

Calibration for 1/4 to 1/2 in.

Stroke Valves

The stroke, zero, and span

settings are factory calibrated to

accept a 0 to 10 volt signal from

a controller. To change the

factory settings, proceed as

follows:

Stroke Adjustment ( See Fig. 1)

1. Adjust the stroke

potentiometer fully CCW to

maximum. Adjust the span

potentiometer fully CCW to

minimum. Adjust the zero

potentiometer fully CW to

minimum.

2. Provide an input signal of

10 VDC to the actuator.

After the actuator strokes

completely to the stem-

down position, slowly adjust

the stroke potentiometer

CW until the stem just

begins to move up. Then

adjust the stroke

potentiometer CCW until

the stem strokes down and

the limit switch clicks. Turn

the stroke adjustment an

additional 1/8 rotation CCW

to assure positive full

stroke.

Zero Adjustment

3. Adjust the zero

potentiometer fully CCW to

maximum.

4. Provide an input signal

equal to the desired zero

(starting point) value and

then wait for the actuator to

stroke to the stem-up

position and the limit switch

clicks.

5. Slowly adjust the zero

potentiometer CW until the

actuator just begins to

stroke.

Span Adjustment

6. Adjust the span

potentiometer fully CW to

maximum.

7. Provide an input signal

equal to the desired full

stroke voltage. (This value

must be at least 2.5 VDC

greater than the zero value.)

8. Slowly adjust the span

potentiometer CCW until

the actuator is fully stroked

to the stem-down position

and the limit switch clicks.

Calibration for 3/4 in. Stroke,

2-Way PDO Valves

The stroke, zero, and span

settings are factory calibrated to

accept a 0 to 10 volt signal from

VA-8052 Technical Bulletin 5

a controller. To change the

factory settings, proceed as

follows:

Stroke Adjustment (See Fig. 1)

1. Adjust the stroke

potentiometer fully CCW to

maximum. Adjust the span

potentiometer fully CCW to

minimum.

Zero Adjustment

2. Adjust the zero potentiometer

fully CCW to maximum.

3. Provide an input signal

equal to the desired zero

(starting point) value and

then wait for the actuator to

stroke to the stem-up position

and the limit switch clicks.

4. Slowly adjust the zero

potentiometer CW until the

actuator just begins to stroke.

Span Adjustment

5. Adjust the span potentiometer

fully CW to maximum.

6. Provide an input signal

equal to the desired full

stroke voltage. (This value

must be at least 2.5

VDC greater than the

zero value.)

7. Slowly adjust the span

potentiometer CCW until

the actuator is fully stroked

to the stem-down position.

The drive coupler must not

contact the bottom surface

of the actuator yoke.

Calibration for 3/4 in. Stroke,

2-Way PDC Valves

The stroke, zero and span

settings are factory calibrated to

accept a 0 to 10 VDC from a

controller. To change the

factory settings, proceed as

follows:

Stroke Adjustment (See Fig. 1)

1. Adjust the stroke

potentiometer fully CCW to

maximum. Adjust the span

potentiometer fully CCW to

minimum.

Zero Adjustment

2. Adjust the zero

potentiometer fully CCW to

maximum.

3. Provide an input signal

equal to the desired zero

(starting point) value and

then wait for the actuator to

stroke to the stem-up

position.

4. Slowly adjust the zero

potentiometer CW until

the actuator just begins to

stroke.

Span Adjustment

5. Adjust the span

potentiometer fully CW to

maximum.

6. Provide an input signal

equal to the desired full

stroke voltage. (This value

must be at least 2.5 VDC

greater than the zero value.)

7. Slowly adjust the span

potentiometer CCW until

the actuator is fully stroked

to the stem-down position

and the limit switch clicks.

Wiring

All wiring must be in accordance

with applicable electrical code

requirements. Input lines to the

actuator must be wired correctly

for the valve to work.

CAUTION: Use the

VA-8000-101 Insulator Kit

for steam applications,

280°F (138°C) maximum.

Repair Information

Field repairs must not be made.

For a replacement VA-8052,

contact the nearest Johnson

Controls branch office.

Controls Group

507 E. Michigan Street

P.O. Box 423 Printed in U.S.A.

Milwaukee, WI 53202

Fig. 4 -- Typical Application

Application and Drawing

Identification

Fig. 5 -- VA-8052 Dimensions in./mm

Johnson Controls VA-8052 User manual

Johnson Controls VA-8052 User manual

Johnson Controls VA-8052 User manual

Related papers

Other documents