Belimo LMB series Guide

General Information

Preliminary steps

1. Belimo actuators with NEMA 1 or NEMA 2

ratings should be mounted indoors in a

dry, relatively clean environment free from

corrosive fumes. If the actuator is mount-

ed outdoors, a protective enclosure must

be used to shield the actuator.

2. For new construction work, order dampers

with extended shafts. Instruct the install-

ing contractor to allow space for mounting

the Belimo actuator on the shaft.

For replacement of existing gear train actua-

tors, there are two options:

A. From a performance standpoint, it is

best to mount the actuator directly

onto the damper shaft.

B. If the damper shaft is not accessible,

mount the non-spring return actuator

with a ZG-NMA or ZG-GMA crankarm

kit, and a mounting bracket (ZG-100,

ZG-101, ZG-103, ZG-104)

10 VDC

2 VDC

10 VDC

2 VDC

Direction of Rotation Switch

Non-spring return actuators have a reversing

switch on the cover. Switch position indicates

start point. For the non-spring return, with the

switch in position 1, the actuator rotates clock-

wise with a decrease in voltage or current.

With the switch in position 0, the actuator

rotates counterclockwise with a decrease in

voltage or current.

The non-spring return rotates clockwise when the

switch is in the 1 position and power is applied to

wire #2. When power is applied to wire #3 the

actuator rotates counter clockwise.

Rotating the switch to 0 reverses the control logic.

During checkout, the switch position can be tem-

porarily reversed and the actuator will reverse its

direction. This allows the technician a fast and

easy way to check the actuator operation without

having to switch wires or change settings on the

thermostat. When the check-out is complete,

make sure the switch is placed back to its

original position.

The …-S model actuators are equipped with an

adjustable auxiliary switch used to indicate damp-

er position or to interface additional controls or

equipment. Switching positions can be set over

the full 0 to 95° rotation simply by setting

a switch on the actuator.

Auxiliary Switches

S2 S3

Switch Rating

Voltage 250 VAC

Resistive load 3 A

Inductive load 0.5 A

Please refer to the appropriate product liter-

ature for detailed installation information.

Reference

• Mounting Methods Guide

• Wiring Guide

• Damper Application Guide

Mounting Installation Instructions

LM, NM, AM, GM

70569-00001 Rev E

Installation Instructions

Quick-Mount Visual Instruction for Mechanical Installation

See next page for standard mounting instructions.

A* B C** D

LMB 1/4” to 5/8” 5/16” to 9/16” 1.5” 4 to 5 ft-lb

LMQB 1/2” to 1.05” 3/8” to 11/16” 1.5” 6 to 7 ft-lb

NMB 1/2” to 1.05” 3/8” to 11/16” 1.5” 6 to 7 ft-lb

NMQB 1/2” to 1.05” 3/8” to 11/16” 1.5” 6 to 7 ft-lb

AMB 1/2” to 1.05” 3/8” to 11/16” 1.5” 6 to 7 ft-lb

AMQB 1/2” to 1.05” 7/16” to 11/16” 1.5” 6 to 7 ft-lb

GMB 1/2” to 1.05” 7/16” to 11/16” 1.5” 6 to 7 ft-lb

*LMB standard clamp has max 5/8” diameter. Accessory clamp

K-LM20 can be mounted for sizes up to 3/4” diameter. NM and

AM clamps have an insert that self-centers on the following

diameter shafts: 1/2” (default), 3/4” and 1.05”. GM clamps have

an insert that self-centers on 3/4” diameter.

**Shorter with reversible clamp for NMB, AMB, and GMB

LM Universal

Mounting Bracket

Mounting Installation

Reversible Clamp Quick Mount (NM, AM, GM)

1. Turn the damper shaft until the blades are

fully closed.

2. ① Slip the actuator’s universal clamp over the

damper shaft. Make sure that the duct and

the controls on the cover are accessible.

Place the actuator in the desired mounting

position.

➁ Hand tighten the two nuts on the actuators

universal clamp.

3. ① Disengage the actuator gear train by

pressing the manual override button and

rotate the clamp until centered.

➁ Slide the anti-rotation strap up under the

actuator so it engages the actuator at the

center of the cutout. Bend the bracket as

needed to support the rear of the actuator.

Secure to ductwork with self-tapping

screws (No. 8 recommended).

4. ① Loosen the nuts on the universal clamp.

Press the manual override button and

rotate the clamp to about 5° from the

closed position (1/16 to 1/8” between stop

and clamp).

➁ Tighten the two nuts on the universal

clamp with a 8, 10 or 12mm wrench

(see table, column D on page 2 for

required torque).

5. ① Snap on the reflective position indicator.

➁ Adjust end-stops, if required

6. Mount actuators indoors. If mounted out-

doors, use approved protective enclosure.

The damper is now fully closed but the actuator

is 5° from fully closed. This is called “pre-load-

ing” the actuator. When the actuator is powered

and sent to the closed position: it will put its full

torque on the shaft compressing the edge and

blade seals. This ensures that the damper will

meet its leakage rating. The actuator is elec-

tronically protected from overload and will not be

damaged.

Testing the installation without power

1. Disengage the gear train with the manual

override button and move the shaft from

closed to open to closed. Ensure that there

is no binding and that the damper goes fully

open and closes with 5° of actuator stroke

left.

2. Correct any problems and retest.

Standard Mounting

Center the

anti-rotational

bracket in the

slot.

Wiring

On/Off, Floating Point

124

24 VAC Transformer

a open

a closed

The indication of direction

is valid for switch position 1.

Blk (1) Common

Red (2) +

Wht (3) +

Line

Volts

–

W266

124

24 VAC Transformer

The indication of direction

is valid for switch position 1.

Blk (1) Common

Red (2) +

Wht (3) +

Line

Volts

–

W267

On/Off

Vlt (S1)

Red (S2)

Wht (S3)

0 to 95

W268

Floating Point or On/Off control

Auxiliary Switch of

LMB24-3-S and

AMB24-3-S

Notes:

Provide overload protection and disconnect as required.

Actuators may also be powered by 24 VDC for a 24V power supply.

For end position indication, interlock control, fan startup, etc.,

xMB24-3-S incorporates one built-in auxiliary switches:

1 x SPDT, 3A (0.5A) @250 VAC, UL listed, adjustable 0° to 95°.

Meets cULus requirements without the need of an electrical

ground connection.

For 100 to 240 VAC no transformer is required.

Torque

(based on 4 in-lb per sq. ft)

Running

Time

Power

Supply

Power

Consumption Feedback

Airside

Products

35 in-lb [4 Nm],

Apprx. 11 sq. ft.

45 in-lb [5 Nm],

Apprx. 11 sq. ft.

70 in-lb [8 Nm],

Apprx. 22 sq. ft.

90 in-lb [10 Nm],

Apprx. 22 sq. ft.

140 in-lb [15 Nm]

Apprx. 45 sq. ft.

180 in-lb [20 Nm],

Apprx. 45 sq. ft.

360 in-lb [40 Nm],

Apprx. 90 sq. ft.

Motor Drive

(Default)

24 VAC +/- 20%,

VDC +/- 15%

100 to 240 VAC

VA rating

Wattage running

(holding)

5 kΩResistive

10 kΩResistive

GMB24-3 150 6 4 (2.0)

GMX24-3 150 6 4 (2.0)

GMX120-3 150 7 4 (2.0)

AMB24-3 95 5.5 2.5 (0.2)

AMB24-3-S 95 5.5 2.5 (0.2)

AMX24-3  95 5.5 2.5 (0.2)

AMX24-3-T 95 5.5 2.5 (0.2)

AMX120-3 95 7 3 (0.6)

AMQB24-1 718 12 (1.5)

AMQX24-1 718 12 (1.5)

NMB24-3 95 4 2 (0.2)

NMX24-3 95 4 2 (0.2)

NMX24-3-T 95 4 2 (0.2)

NMX120-3 95 7 3 (0.6)

NMQB24-1 418 12 (1.5)

NMQX24-1 418 12 (1.5)

LMB24-3 95 2 1.5 (0.2)

LMB24-3.1 95 2 1.5 (0.2)

LMB24-3-S 95 2 1.5 (0.2)

LMB24-3-T 95 2 1.5 (0.2)

LMB24-3-T.1 95 2 1.5 (0.2)

LMB24-3-P5-T 95 2 1.5 (0.2) 

LMX24-3-P5-T.1 95 2 1.5 (0.2) 

LMX24-3-P10-T 95 2 1.5 (0.2) 

LMX24-3 95 2 1.5 (0.2)

LMX24-3-T 95 2 1.5 (0.2)

LMX120-3 95 4 2 (0.5)

LMQB24-1 2.5 18 12 (1.5)

LMQX24-1 2.5 18 12 (1.5)

Wiring

2 to 10 VDC

Wiring

To other

actuators

24 VAC Transformer

Blk (1) Common

Red (2) Hot +

Wht (3) Y Input, 2 to 10V

Org (5) U Output, 2 to 10V

4 to 20 mA

Control Signal

(–)

(+)

500Ω

Line

Volts

Notes:

–

W265

1 Neutral

2 Hot +

N L1

H L2

To other

actuators

1 Blk Common

2 Red Hot +

3 Wht Y Input, 2 to 10V

5 Org U Output, 2 to 10V

4 to 20 mA

2 to 10 VDC (–)

(+)

500Ω

SGF24

SGA24

100 to 240 VAC

Cable 2Cable 1

W368 Rev

Notes:

Provide overload protection and disconnect as required.

Actuators may be connected in parallel. Power consumption and

input impedance must be observed.

Actuators may also be powered by 24 VDC.

The ZG-R01 500ž resistor converts the 4 to 20 mA control signal

to 2 to 10 VDC, up to 2 actuators may be connected in parallel.

Only connect common to neg. (–) leg of control circuits.

Torque

(based on 4 in-lb per

sq. ft)

Running

Time

Power

Supply

Power

Consumption Feedback

Airside

Products

45 in-lb [5 Nm],

Apprx. 11 sq. ft.

90 in-lb [10 Nm],

Apprx. 22 sq. ft.

180 in-lb [20 Nm],

Apprx. 45 sq. ft.

360 in-lb [40 Nm],

Apprx. 90 sq. ft.

Motor Drive

(Default)

24 VAC +/- 20%,

VDC +/- 15%

100 to 240 VAC

VA rating

Wattage running

(holding)

2 TO 10 VDC

GMB24-SR 150 6 4 (2.0) 

GMX24-SR 150 6 4 (2.0) 

AMB24-SR 95 5.5 2.5 (0.2) 

AMX24-SR  95 5.5 2.5 (0.2) 

AMX24-SR-T 95 5.5 2.5 (0.2)

AMX120-SR 95 7.5 4 (1.0) 

NMB24-SR 95 4 2 (0.2) 

NMX24-SR 95 4 2 (0.2) 

NMX24-SR-T 95 4 2 (0.2)

NMX120-SR 95 7 3 (0.6) 

LMB24-SR 95 2 1.5 (0.2) 

LMB24-SR.1 95 2 1.5 (0.2) 

LMB24-SR-T 95 2 1.5 (0.2)

LMB24-SR-T.1 95 2 1.5 (0.2)

LMB24-3-P5-T 95 2 1.5 (0.2) 

LMX24-SR 95 2 1.5 (0.2)

LMX24-SR-T 95 2 1.5 (0.2)

LMX120-SR 95 4 2 (0.5) 

Wiring

MFT

Wiring

Provide overload protection and disconnect as required.

Actuators may be connected in parallel if not mechanically mounted

to the same shaft. Power consumption and input impedance must

be observed.

3Actuators may also be powered by 24 VDC.

Notes:

4Position feedback cannot be used with a Triac sink controller.

The actuator internal common reference is not compatiable.

6Control signal may be pulsed from either the Hot (Source)

or Common (Sink) 24 VAC line.

7ZG-R01 may be used.

8Contact closures A & B also can be triacs. A & B should

both be closed for triac source and open for triac sink.

9For triac sink the common connection from the actuator

must be connected to the hot connection of the controller.

VDC/4-20 mA

Blk (1) Common

Red (2) + Hot

Wht (3) Y1Input, 2 to 10V

Org (5) U Output, 2 to 10V

4 to 20 mA

2 to 10 VDC

Control Signal

Line

Volts

24 VAC Transformer

(+)

(–)

Ω500Ω

1/4 watt

On/Off

Blk (1) Common

Red (2) Hot

Wht (3) Y Input

Org (5) U Output

Line

Volts

24 VAC/DC Transformer

…MFT

Position

Feedback VDC (+)

(–)

PWM

Blk (1) Common

Red (2) + Hot

Wht (3) Y Input

Org (5) U Output

Line

Volts

24 VAC Transformer (AC only)

(+)

(–)

…MFT

Position

Feedback VDC

Floating Point

…MFT

Line

Volts

2 to 10 VDC

Feedback Signal

24 VAC Transformer

Blk (1) Common –

Wht (2) Hot +

Wht (3) Y1Input

Pnk (4) Y2Input

Org (5) U Output 2 to 10V

Notes:

W399

Provide overload protection and disconnect as required.

Actuators may be connected in parallel if not mechanically

mounted to the same shaft. Power consumption and input

impedance must be observed.

Actuators may also be powered by 24 VDC.3

Position feedback cannot be used with a Triac sink controller.

The actuator internal common reference is not compatiable.

Control signal may be pulsed from either the Hot (Source)

or Common (Sink) 24 VAC line.

ZG-R01 may be used.

Contact closures A & B also can be triacs. A & B should both

be closed for triac source and open for triac sink.

For triac sink the common connection from the actuator

must be connected to the hot connection of the controller.

Torque

(based on 4 in-lb per sq. ft)

Running

Time

Power

Supply

Power

Consumption Feedback

Airside

Products

35 in-lb [4 Nm],

Apprx. 11 sq. ft.

45 in-lb [5 Nm],

Apprx. 11 sq. ft.

70 in-lb [8 Nm],

Apprx. 22 sq. ft.

90 in-lb [10 Nm],

Apprx. 22 sq. ft.

140 in-lb [15 Nm]

Apprx. 45 sq. ft.

180 in-lb [20 Nm],

Apprx. 45 sq. ft.

360 in-lb [40 Nm],

Apprx. 90 sq. ft.

Motor Drive

(Default)

24 VAC +/- 20%,

VDC +/- 15%

VA rating

Wattage running

(holding)

2-10 VDC (default)

VDC Variable

(0 to 10 VDC)

GMX24-MFT 150 6.5 4.5 (2.0) 

AMX24-MFT 150 6 4 (1.2) 

AMQX-MFT 718 12 (1.5) 

NMX24-MFT 150 5.5 3.5 (1.2) 

NMQX-MFT 418 12 (1.5) 

LMX24-MFT 150 3.5 2 (1.2) 

LMQX-MFT 2.5 18 12 (1.5) 

Wiring

0 to 135 Ωand 0 to 20 V Phasecut

Wiring

24 VAC Transformer

Blk (1) Common

Red (2) Hot +

Pnk (6) Y Input,

0 to 20V phasecut

Org (5) U Output, 2 to 10V

…PC

Line

Volts

0 to 20 V Phasecut

Control Signal (–)

(+)

–

1 Common, Blk

2 + Hot, Red

3 W, Wht

6 R, Pk

7 B, Gy

5 ‘U5’, Org

…MFT95

Line

Volts

24 VAC Transformer

1 Common, Blk

2 + Hot, Red

3 W, Wht

6 R, Pk

5 B, Gy

6 ‘U5’, Org

…MFT95

To other

actuators

Resistor Kit No. ZG-R03

Series 90

Controller

Shunting

Resistor

Line

Volts

No. of

actuators Resistance

2 140 Ω

3 71.5 Ω

4 47.5 Ω

5 37.5 Ω

6 28 Ω

Wiring multiple actuators to a Series 90 controller.

W185

W211

Provide overload protection and disconnect as required.

Actuators may be connected in parallel. Power consumption

and input impedance must be observed.

Actuator may also be powered by 24 VDC.

Actuators and controller must have separate transformers.

Consult controller instruction data for more detailed

installation information.

Resistor value depends on the type of controller and the

number of actuators. No resistor is used for one actuator.

Honeywell resistor kits may also be used.

To reverse control rotation, use the reversing switch.

Notes:

Torque

(based on 4 in-lb per

sq. ft)

Running

Time

Power

Supply

Power

Consumption Feedback

Airside

Products

45 in-lb [5 Nm],

Apprx. 11 sq. ft.

90 in-lb [10 Nm],

Apprx. 22 sq. ft.

180 in-lb [20 Nm],

Apprx. 45 sq. ft.

360 in-lb [40 Nm],

Apprx. 90 sq. ft.

Motor Drive

(Default)

24 VAC +/- 20%,

VDC +/- 15%

VA rating

Wattage running

(holding)

2 tO 10 VDC

(Default)

VDC Variable

(0 to 10 VDC)

GMX24-MFT95 150 6.5 4.5 (2.0) 

AMX24-MFT95 150 6 4 (1.25) 

NMX24-MFT95 150 5.5 3.5 (1.25) 

LMX24-MFT95  150 3.5 2 (1.2) 

GMX24-PC 150 6.5 4.5 (2.0) 

AMX24-PC 150 6 4 (1.25) 

NMX24-PC 150 5.5 3.5 (1.25) 

LMX24-PC 150 3.5 2 (1.2) 

Manual Override

The Belimo non-spring return actuators have a

black, “manual override button” located on the top

of the housing. Press this button and the gear train

is disengaged so the damper shaft can be moved

manually. Release the button and the gear train is

re-engaged.

Use the manual override to test the installa-

tion without power. For tight shut-off

the damper should close with

5° of actuator stroke left.

Manual

override

button

Operations

Mechanical Features

Mechanical Angle of Rotation Limiting

The adjustable stops are needed when there is

no damper stop or if you want the damper to

stop rotating before it reaches its stops. The

non-spring return actuators can be indefinitely

stalled in any position without harm.

1. Loosen the two end stops with a No. 2 Phillips

head screwdriver being careful not to unscrew

the captive nut under the slot.

2. Move the stops (in 2.5° steps) to the desired

position and re-tighten the screws.

Z-SMA for replacing AM and SM actuators

Z-GMA for replacing GM actuators

AM/SM

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