Schneider Electric AV-644 Series Installation Instructions

Application

Note: Obsolete linkages are displayed in Figure-1.

The AV-644 series linkage kits are required for the assembly of MF and MS-2xxxx model actuators to valves.

The AV-644 linkage kit replaces the AV-643 linkage kit

h plastic stem extension for the assembly of MF and

wit MS-223xx thermally isolated actuator models with manufacture date codes prior to 9812.

The AV-644 linkage kit replaces all linkages for MF and

2xxxx actuators, including thermally isolated

MSmodels with manufacture date codes after 9832.

The AV-644-10 linkage kit replaces the AV-640 linkage

for all MF-221xx actuator models.

kit

AV-644 Series

Valve Linkage Kit

Installation Instructions

AV-644

Applicable Literature

• MS-22353 Proportional Valve Actuator General

Instr

uctions, F-26263

• MF-22xx3 Series Floating Valve Actuator General

Instr

uctions, F-26264

• MF-23xx3 Series High Output Force Floating Valve

Actuator General Instructions, F-26572

• Electric/Electronic Products Catalog, F-27382

AV-644-10

Table-1 Valve Linkage Conversion Chart.

AV-640 Obsolete

AV-643 Obsolete

(Plastic Stem Extension

AV-641 Obsolete

Figure-1 Obsolete Valve Linkage Kit Identification.

Actuator Part Number

MF-22103

MF-22123

Manufacturing Date

Code

All AV-6 40 AV-644-10

Original LinkageaReplacement Linkage

MF-2x203 After 9832 AV-6 44 AV-644

MF-22303

Prior to 9812 AV-6 43 AV-644

9812 to 9832 AV-641 None

MF-2x303 After 9832 AV-6 44 AV-644

MF-22323

Prior to 9812 AV-6 43 AV-644

9812 to 9832 AV-641 None

MF-2x323 After 9832 AV-6 44 AV-644

Prior to 9812 AV-6 43 AV-644

MS-22353

9812 to 9832 AV-641 None

After 9832 AV-6 44 AV-644

Refer to Figure-1 for obsolete valve linkage kit identification.

Actuator drive screw is removable.

The brass stem extension threads are coated with nylon

Replacement linkage not available. Replace actuator

ASSEMBLY/ADJUSTMENT INSTRUCTIONS

Caution: Damage can occur if an actuator equipped with a potentiometer (seven wires) is run or manually adjusted without being mounted to a valve. This causes the potentiometer output to be out of specification and requires the actuator position to be re-established. If an actuator is run or adjusted without being mounted to a valve, follow the “Re-establishing Potentiometer Position” procedure on Page-11 before mounting the actuator to the valve.

Actuator

Packing Nut

Valve Stem

Mounting Nut

Position Indicator Nut*

Locknut*

Lock Washer*

FRAC-209-1*

Included in AV-640 Valve Linkage Kit

Stem Extension*

Actuator/Valve

Mounting Opening

Manual Override Screw (use 5/32" Allen wrench)

Manual Override Button

Figure-2 MF-221xx Series Actuator Valve Assembly with Obsolete AV-640 Linkage.

Assembly

The following models use round ID drive screws (confirm by removing the indicator nut and looking at the center of the drive screw) that cannot be removed from the actuator.

Position the actuator above center line of valve to prevent damage from condensation and dripping water.

Replacing AV-640 with AV-644-10 Valve Linkage on MF-221xx Actuators

1. Disconnect power from the actuator.

2. Verify actuator part number is of the MF-221xx series. The center of the drive screw and the center section of the stem extension should both be round.

3. Unscrew the position indicator nut on the top of the actuator and remove it. Insert FRAC-2091 pin through the hole in the position indicator nut and loosen by hand. Refer to Figure-2 for part identification.

4. Unscrew the mounting nut from the actuator.

5. Remove the actuator from the valve. Lift the actuator to separate it from the valve and linkage.

6. Unscrew the stem extension and locknut to remove them from the valve stem.

7. Peel back the label on top of the actuator to expose the drive screw. Remove the drive screw from the actuator. Use a tapered pencil inserted in the center of the drive screw to unscrew it.

8. Discard the old position indicator nut, stem extension, lock washer, locknut, and drive screw.

9. Replace all the old parts with new parts from the AV-644-10 linkage kit in reverse order, starting with the white plastic drive screw. Refer to

Figure-3.

Packing Nut

Valve Stem

Position Indicator Nut*

Mounting Nut

Locknut*

Stem Extension*

Actuator/Valve

Mounting Opening

Available in AV-644-10 Valve Linkage Kit

Manual Override Screw (use 5/32" Allen wrench)

Manual Override Button

Drive Screw*

Figure-3 MF-221xx Series Actuator Valve Assembly with AV-644 Linkage.

3/4" max.

(19 mm max.)

Drive Screw

Actuator Case

Do not block drainage slots (3)

Figure-4 MF-221xx Actuator Drive Screw Position.

10. Insert the drive screw into the actuator. Insert a tapered pencil or pen into the drive screw and rotate.

11. Confirm that the drive screw for the MF-221xx actuator is mounted the required distance from the top of the actuator case. See

Figure-4. If the drive screw is not in position, insert a

tapered pencil or pen into the drive screw and rotate.

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