Modulating actuators

Actuator LM24A-SR

Modulating actuators

FOR VARIABLE VOLUME FLOWS IN AIR CONDITIONING SYSTEMS

Actuators for mechanical self-powered CAV controllers Type EN, RN, or VFC, and for flow adjustment dampers Type VFR

Setpoint value adjustment
Supply voltage 24 V AC/DC
Control input signal: Voltage signal 0 – 10 V DC or 2 – 10 V DC
Potentiometer or mechanical stops
Positive lock connection with CAV controller or flow adjustment damper
Retrofit possible

Application

Actuators for variable adjustment
Variable adjustment of volume flow setpoint values of mechanical self-powered CAV controllers Type EN, RN or VFC
Setting of various damper blade positions of flow adjustment dampers Type VFR

Description

Parts and characteristics

Potentiometer or mechanical stops for setting the volume flow rate setpoints
Supply voltage 24 V AC/DC
Overload protection
Setpoint value signal 0 – 10 V DC or 2 – 10 V DC

Technical information

Function, Technical Data

Variable control initiated by a voltage signal

U Voltage signal 0 – 10 V DC or 2 – 10 V DC

Functional description

The actuator moves the damper blade mechanism to any position between minimum and maximum.

Minimum and maximum positions can be set on potentiometers.

The control input signal is a voltage signal. The output signal indicates the damper blade position rather than the volume flow rate actual value since the CAV controller does not perform any measurements.

Control options and effect of actuator action in case of factory setting

Order code detail	Function	Control	Direction of rotation
Order code detail	Function	Control	1	2
B70, B72	Variable	Variable control
B70, B72	Min/Max	1-wire control, 2-wire control	Vmin	Vmax
E03	Variable	Variable control

Actuators LM24A-SR and LM24A-SR-F

Supply voltage (AC)	24 V AC ± 20 %, 50/60 Hz
Supply voltage (DC)	24 V DC ± 20 %
Power consumption – load	1 W
Power consumption – idle	0.4 W
Power rating	2 VA
Torque	5 Nm
Running time for 90°	150 s
Position feedback	2 – 10 V DC, 1 mA
Control signal	2 – 10 V DC, Ra > 100 kΩ
Connecting cable	4 × 0.75 mm², 1 m long
IEC protection class	III (protective extra-low voltage)
Protection level	IP 54
EC conformity	EMC to 2014/30/EU, RoHS to 2011/65/EU
Operating temperature	–30 to 50 °C
Weight	0.5 kg

Auxiliary switch S2A

Type of contact	2 changeover contacts1)
Max. switching voltage (AC)	250 V AC
Max. switching current (AC)	3 A (resistive load); 0.5 A (inductive load)
Max. switching voltage (DC)	110 V DC
Max. switching current (DC)	0.5 A (resistive load); 0.2 A (inductive load)
Connecting cable	6 × 0.75 mm², 1 m long
IEC protection class	II (protective insulation)
Protection level	IP 54
EC conformity	EMC to 2014/30/EU, low voltage to 2014/35/EU, RoHS to 2011/65/EU
Operating temperature	–30 to 50 °C
Weight	0.250 kg

1) If both auxiliary switches are used the switching voltages must be the same

Actuator 224C-024-02-003

Supply voltage (AC)	24 V AC ± 20 %, 50/60 Hz
Supply voltage (DC)	24 V DC ±20 %
Power rating (AC)	3 VA
Power rating (DC)	2 W
Torque	5 Nm
Running time for 90°	20 – 60 s
Control signal	0 – 10 V DC, Ra > 100 kΩ
Connecting cable	3 × 0.75 mm², 1 m long
IEC protection class	III (protective extra-low voltage)
Protection level	IP 42
EC conformity	EMC according to 2014/30/EU, RoHS to 2011/65/EU
Operating temperature	–30 to 50 °C
Weight	0.5 kg

Variants

Actuator LM24A-SR 00132720_0

Any attachments are to be defined with the order code of the CAV controller.

B7*

Application

Actuator LM24A-SR for the variable adjustment of volume flow setpoint values of mechanical self-powered volume flow controllers Type RN or EN (only up to a height of 300 mm)

Variants

B72: with auxiliary switch for capturing the end positions

Parts and characteristics

Supply voltage 24 V AC/DC
Control input signal: Setpoint value signal 2 – 10 V DC, corresponds to the total rotation range (90°), working range is limited by mechanical stops
Output: Position feedback 2 – 10 V
Mechanical stops for setting the volume flow rates
Switch for setting the direction of rotation
Positive lock connection with damper blade shaft
Release button to allow for manual operation

Commissioning

Set the mechanical stops according to the minimum and maximum volume flow rates
Change the direction of rotation if necessary, using the switch

B*2

Application

Auxiliary switch S2A for capturing damper blade end positions (end positions reached through actuator operation)
Volt-free contacts for signalling or activating switch functions
Two integral switches, e.g. for damper blade OPEN and damper blade CLOSED
Potentiometer for setting any switch point

E03

Application

Actuator 224C-024-02-003 for variable adjustment
Variable adjustment of volume flow setpoint values of mechanical self-powered CAV controllers Type VFC
Setting of various damper blade positions of flow adjustment dampers Type VFR

Parts and characteristics

Supply voltage 24 V AC/DC
Control input signal: Setpoint value signal 2 – 10 V DC, corresponds to the working range (set on potentiometers)
Output: Position feedback 0 – 10 V
Potentiometer for setting the volume flow rate setpoints
Positive lock connection with damper blade shaft
Functional test button: Motor drives first to minimum position, then to maximum position, then returns to the set position
Indicator light: Actuator has reached setpoint, actuator in motion, actuator blocked

Commissioning

Use the potentiometer to set the minimum or maximum volume flow rate

Actuators for volume flow controllers Type RN or EN

Order code detail	Actuator			Auxiliary switch
Order code detail	Part number	Type	Supply voltage	Part number	Type
B70	M466DT6	LM24A-SR-F	24 V AC/DC
B72	M466DT6	LM24A-SR-F	24 V AC/DC	M536AI3	S2A

Actuators for volume flow controllers Type VFC and for flow adjustment dampers Type VFR

Order code detail	Part number	Type	Setpoint setting	Supply voltage
E03	M466EP7	224C-024-02-003	Potentiometer	24 V AC/DC

Electrical connection

LM24A-SR, connecting cable core identification 00114398_0.

1 ⊥, –: Ground, neutral
2 ~, +: Supply voltage
3 Y: Setpoint value signal
5 U: Position feedback

LM24A-SR and LM24A-SR-F

Downloads

product information

Product data sheet - Variable Actuators

PD_2025_01_31_DE_en | Product data sheet - Variable Actuators 330 KB pdf

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