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
S1
S2 S3
S1
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

2
Installation Instructions
Quick-Mount Visual Instruction for Mechanical Installation
®
C
A
B
1
1
2
5
10
D
2
1
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
12
3
5
4
LM Universal
Mounting Bracket

3
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
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) +
a
Line
Volts
–
10
5
W266
124
24 VAC Transformer
The indication of direction
is valid for switch position 1.
Blk (1) Common
Red (2) +
Wht (3) +
Line
Volts
–
10
W267
On/Off
4
3
Vlt (S1)
Red (S2)
Wht (S3)
NC
NO
0 to 95
W268
Floating Point or On/Off control
4
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.
1
2
3
4
5
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)

5
Wiring
2 to 10 VDC
®
Wiring
4
To other
actuators
3
5
6
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
(–)
(+)
Ω
500Ω
2
1
Line
Volts
Notes:
–
10
W265
1
2
1 Neutral
2 Hot +
N L1
H L2
4
To other
actuators
5
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 (–)
(+)
Ω
500Ω
10
SGF24
SGA24
or
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.
1
2
3
4
5
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) 

6
Wiring
MFT
®
Wiring
1
2
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
7
Blk (1) Common
Red (2) + Hot
Wht (3) Y1Input, 2 to 10V
Org (5) U Output, 2 to 10V
4 to 20 mA
or
2 to 10 VDC
Control Signal
Line
Volts
24 VAC Transformer
2
1
3
(+)
(–)
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
a
Position
Feedback VDC (+)
(–)
2
1
3
PWM
Blk (1) Common
Red (2) + Hot
Wht (3) Y Input
Org (5) U Output
Line
Volts
24 VAC Transformer (AC only)
(+)
(–)
6
2
…MFT
…MFT
Position
Feedback VDC
1
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
1
3
6
4
2
A
B
8
9
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.
1
2
3
4
6
7
8
9
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) 

7
Wiring
0 to 135 Ωand 0 to 20 V Phasecut
®
Wiring
1
6
3
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
3
5
4
2
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
3
5
1 Common, Blk
2 + Hot, Red
3 W, Wht
6 R, Pk
5 B, Gy
6 ‘U5’, Org
…MFT95
W
R
B
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.
1
2
3
6
3
4
5
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) 

8
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.
2x
Z-SMA for replacing AM and SM actuators
Z-GMA for replacing GM actuators
GM
AM/SM
1
A
B
10/08 Subject to change. © Belimo Aircontrols (USA), Inc.