Schneider Electric M556 Series, M573 Series, M574 Series Data Sheet

APPLICATION

The M556 piston damper actuator, post mounted, is designed for use in a pneumatic control system to position an air control damper in response to a signal from a pneumatic controller. These actuators can be used for either proportional or two position applications. Other applications include the control of variable fan inlet vanes, centrifugal refrigeration compressor inlet vanes, and butterfly valves.

The M573 and M574 Series Piston Damper Actuators are used in pneumatic control systems to position automatic air dampers up device. These actuators can be used for either proportional or two position applications.

The M573 and M574 actuators are equipped with right angle bracket heating, ventilating, fan coil units, unit ventilators, and mixing boxes.

on receipt of an air pressure signal from a control

s and are adaptable to air conditioning, multi-zone,

M556, M573, M574 Series

Piston Damper Actuators

General Instructions

SPECIFICATIONS

Construction:

Housing, Glass filled nylon.

Diaphragm, Neoprene, rolling type. Stroke: See Table-1. Spring: Retract actuator shaft on loss of air pressure. Maximum Damper Area: See Table-2. Environment:

Ambient Temperature Limits, -20 to 140 °F (-29 to

60 °C). Supply Air Pressure: Clean, dry, oil free air required (ref. EN-123

Air Consumption (Positioner Models): 0.017 scfm. Connections: Barbed fitting for 1/4" O.D. plastic tubing. Mounting: See Mounting Instructions. Dimensions: See Figures-2, 3 & 5.

ACCESSORIES & REPLACEMENT PARTS

AM-111 Slotted crank arm for 5/16" shaft AM-112 Slotted crank arm for 3/8" shaft AM-113 Slotted crank arm for 1/2" AM-115 Slotted crank arm for 7/16" AM-122 Straight connector AM-123 Damper clip AM-125 5/16" x 20" damper rod AM-125-048 5/16" x 48" damper rod AM-132 Ball joint connector N800-0555-P Positioner kit with 5 & 10 psi springs N800-1414 3-hole crank arm for 3/8" shaft N800-1415 3-hole crank arm for 1/2" shaft

Nominal, 20 psig (138 kPa).

Maximum, 30 psig (207 kPa).

Table-1 Specifications.

3" Stroke

(7 sq.in.)

M573-3108 M574-3208 -- 5 - 10

M573-5108 M574-5208 -- 8 - 13

M573-1108 M574-1208 --

M573-3111 M574-3211 -- 5 - 10

M573-5111 M574-5211 -- 8 - 13

M573-1111 M574-1211 --

-- -- M556-51 8 - 13

-- -- M556-14

A 10 psi span positive posi ioner spring is also supplied with the actuator, attached to the feedback arm.

4" Stroke

(11 sq.in.)

6" Stroke

(24.8 sq.in.)

Spring Range

PSIG

8 - 1

With Positioner

8 - 13

With Positioner

8 - 13

With Positioner

Mounting Description

Includes Right Angle Mounting Br

acket

and Ball Joint

Right Angle

Post Mount

Includes Right Angle Mounting Bracket, Ball Join Crank Arm for 1/2" Damper

Shaft

Includes Mounting Plate and Post,

able Damper Crank Arm and

Adjust Clamp for 1/2" Damper Shaf

t, push Rod and

Table-2 Maximum Damper Area (@ 1000 FPM).

Actuator Control Sq. Ft. (Sq. M)

M556 Series (28.4 sq. in.)

M573 Series

(7 sq. in.)

M574 Series

(11 sq. in.)

Proportional 75 (7.0)

Two-P os ition 90 (8.4)

Proportional 12 (1.1)

Two-P os ition 15 (1.4)

Proportional 25 (2.3)

Two-P os ition 30 (2.8)

PRE-INSTALLATION

Inspection

Visually inspect the carton for damage. If damaged, notify the appropriate carrier immediately. Visually inspect the device for obvious damage due to shipping. Return damaged parts to place of purchase.

Required Installation Items

• Piping Diagrams

• Tools (not provided):

Appropriate screwdriver(s) for mounting screws

Appropriate wrench(s) for mounting bolts and nuts

• Appropriate accessories

• Mounting screws (not provided)

Warning:

• Improper installation could result in a hazardous condition

• These actuators contain a powerful spring under

compression. Because of this, they should be repaired, if necessary, only by a qualified controls expert.

Clean, Dry, Oil Free Air Supplies for Pneumatic Systems

Caution: A refrigerated air dryer, particulate filter, and a coalescing filter will provide clean, dry, oil free air required (reference EN-123). Compressor oil must be non-paraffin mineral base or naphtha base. Synthetic or paraff controls and void the warranty.

in base oils will destroy pneumatic

Caution:

1. Installer must be a qualified, experienced technician.

2. Make all connections in accordance with the piping diagram.

Figure-1 Positioner Adjustment and Port Connections.

3. Do not locate the device in ares subjected to excessive vibration, or corrosive atmosphere.

4. Do not exceed ratings of the device.

POSITIVE POSITIONER ADJUSTMENT

See Figure-1.

Span

The signal pressure change required to produce full actuator stroke is determined by the feedback spring. Cataloged models are supplied with factory installed 5 psi springs. M556-14 is also supplied with a 10 psi spring attached to the feedback arm.

Start Point

The signal pressure at which the actuator shaft begins to move is adjustable 3 to 12 psig by rotating the recessed brass knurled dial in the center of positioner.

The start point of the actuator may be adjusted by setting the signal pressure to the de knurled wheel by hand until the actuator shaft begins to move. Turning the wheel outward (toward the spring) raises the start point.

the positioner requires a signal connection to “S” and a main air connection to “M”. The pos needle valve, is connected to the actuator signal port.

sired value and turning the recessed

itioner output, located above the

Adjustable Needle-Valve

Needle-valve allows the adjustment of the rate of actuator movement.

With this needle-valve, 3", 4" and 6" actuators may be adjusted with a small blade screw driver, if required, to:

Give the actuators the same relative rate of movement.

This makes it possible, for example, to have outside, return and relief damper on an air handling unit move “together”, rather that at different rates. This is especially important -

• When large air handling units are started and

stopped.

• When the dampers are switched from “summer” to

“winter” operation (or vice versa).

Both of the above examples can cause large damper movements.

A narrower c used if the actuators are adjusted to move slowly.

This is important for -

ontroller throttling range frequently can be

• Controlling supply air static pressure with a vortex

damper.

• Controlling mixed air temperature with outside, return

and relief dampers.

• Controlling space static pressure with one or more

relief dampers.

MOUNTING INSTRUCTIONS

Whenever feasible, an M556 piston actuator operating an air control damp means of its standard swivel post and plate. If necessary, the mounting surface should be reinforced to withstand the stroke force of more than 700 pounds that the M556 can exert.

When ordered properly, a control damper will have one or more shaft extensions for the required nu These extensions will be in their retracted or “stored” positions when shipped and must be extended and locked in position with their set screws or through bolts.

Before the actuator is mounted, the effective length of its threaded crank a required damper rotation for full stroke (See table in Figure-2). In addition, the “normal” position of the damper blades (open or closed when signal air is removed and the actuator piston retracts) and direction of shaft rotation as the piston is extended must be determined to establish the orientation of the actuator. If this orientation causes the positioner (when furnished) to be located on the same side of the actuator as the crank arm, there may be interference between the crank arm and the feedback arm during operation. In this event, the relationship between the mounting plate and the positioner should be reversed by temporarily disconnecting the factory tubing connection, swinging the mounting post 180° with respect to the actuator housing and then re-connecting the tubing.

After the above steps have been completed, the crank arm clevis can clamping and the position of the mounting plate can be determined by forming a right triangle (See Figure-2), with the hypotenuse being the “effective length” of the threaded crank arm and the base (along the centerline of the actuator) being one-half of the actuator stroke (3", 76 mm). The mounting plate can then be attached to the duct with suitable fasteners, using care not to obstruct the movement of the damper blades.

Note: Note that the actuator need not be mounted at a right angle to the damper frame.

The final installation step of locking the crank arm to the damper shaft extension should be done when control ar is available or by means of a squeeze bulb:

a. For a normally closed damper, apply air pressure to

er should be mounted external to a duct by

mber of actuators.

rm should be adjusted to provide the

be slipped onto the damper shaf

the actuator equal to the low end of its spring range, e.g.: 8 psig (55 kPa) for an 8 to 13 psig (55 to 90 kPa) spring, then close the damper blades against their stops; a slot in the end of the extension shaft indicates blade position. After assuring that it is parallel to the duct surface, clamp the crank arm to the extension shaft by tightening the outermost crank arm nut. When air pressure is removed from the actuator, its residual low end spring force will provide additional damper close-off pressure.

t extension without

M556

External Mounting

See Figure-2.

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Schneider Electric M556 Series, M573 Series, M574 Series Data Sheet

Specifications and Main Features

Frequently Asked Questions

User Manual