57
F20358 / 5 4 3 2 1 -01/04-10M-IG-Subject to change. © Belimo Aircontrols (USA), Inc.
LF
Three-Position Control Signals
Switch A
Wire 2-Red (x)
Wire 3-White (D)
Position
Open**
Any
Any
Closed
(via spring)
Closed
24 VAC
Open
Mid-position*
Closed
Open
24 VAC
Full Open*
Closed
24 VAC
24 VAC
Full Open*
* Desired position achieved by driving actuator with motor.
** An example would be to interlock the actuator power supply
with the fan motor starter.
®
LF24-SR-E US
Proportional damper actuator, 24 V for 2 to 10 VDC (or 4 to 20 mA) control signal or 3-position on/off
control, with minimum position potentiometer. Output signal of 2 to 10 VDC for position indication.
Accessories
AV 10-18
Shaft extension (K6-1 is required)
IND-LF
Damper position indicator
K6-1
Universal clamp for up to 3/4” diameter shafts
KH-LF
Crankarm for up to 1/2” round shaft
Tool-01
10 mm wrench
ZG-LF2
Crankarm adaptor kit for LF
ZG-112
Mounting bracket for replacing Honeywell
Mod IV, M6415 and M8405 type actuators, and
new installations
ZG-LF112 Crankarm adaptor kit for replacing Honeywell
Mod IV, M6415 and M8405 type actuators, and
new installations
ZS-100
Weather shield (metal)
ZS-150
Weather shield (polycarbonate)
Note: When using LF24-SR-E US actuators, only use
accessories listed on this page.
LF24-SR-E US Typical Specification
Spring return control damper actuators shall be direct coupled
type which require no crankarm and linkage and be capable of
direct mounting to a shaft up to a 3/4” diameter and center a
1/2” shaft. Actuator shall deliver a minimum output torque of
35 in-lbs. The actuator must provide proportional damper con-
trol in response to a 2 to 10 VDC or, with the addition of a
500
Ω
resistor, a 4 to 20mA control input from an electronic
controller. Actuator must have a built-in minimum position
potentiometer. During 3-position control, the actuator shall
drive to minimum position with 24 VAC on wire 2 and drive full
open with 24 VAC on wire 3. Actuators shall use a brushless
DC motor controlled by a microprocessor and be protected
from overload at all angles of rotation. Run time shall be con-
stant, and independent of torque. A 2 to 10 feedback signal
shall be provided for position feedback or master-slave applica-
tions. The actuator must be designed so that they may be
used for either clockwise or counterclockwise failsafe opera-
tion. Actuators shall be UL listed and CSA certified, have a 5
year warranty, and be manufactured under ISO 9001
International Quality Control Standards. Actuators shall be as
manufactured by Belimo.
Wiring diagrams
1
3
4
5
2
24 VAC Transformer
Blk (1) Common
Red (2) x + Min-position
Wht (3)
D
Y
Full Open
Grn (5) U
Output, 2 to 10V
Line
Volts
24 VAC
LF24-SR-E US
.8
.6
.4
.2
0
MIN
1
Default
CW CCW
4
1
3
24 VAC Transformer
Line
Volts
24 VAC
5
2
Blk (1) Common
Red (2) x + Min-position
Wht (3)
D
Y
Full Open
Grn (5) U
Output, 2 to 10V
LF24-SR-E US
.8
.6
.4
.2
0
MIN
1
Default
CW CCW
Notes:
1
2
Provide overload protection and disconnect as required.
Min-position is adjustable from 0 to 100% with
a potentiometer on the actuator cover.
3
Actuators with plenum rated cable do not have numbers
on wires; use color codes instead.
4
5
For 3-position control set direction of rotation to CW (Default).
Switch A, actuator spring returns when open (e.g., fan interlock).
W179
W176
3-position control
with a SPDT switch or
two contact closures
(e.g. fan, cooling Y).
Min-position with
Full Open override
(with a single
contact closure).
1
4
5
5
2
3
24 VAC Transformer
Blk (1) Common
Red (2) + Hot
Wht (3) Y
Input,
2 to
10V
Grn (5) U
Output,
2 to
10V
Line
Volts
1
2
Provide overload protection
and disconnect as required.
Actuators may be connected in
parallel. Power consumption and
input impedance must be observed
3
4
Actuators with plenum rated cable do not have num-
bers on wires; use color codes instead.
The ZG-R01 500
Ω
resistor converts the 4-20mA
control signal to 2 to 10 VDC
Actuator may also be powered by 24 VDC.
2 to 10 VDC
Control Signal (–)
(+)
LF24-SR-E US
.8
.6
.4
.2
0
MIN
1
Default
CW CCW
Ω
2 to 10 VDC control of LF24-SR-E US
