B72

Actuator LM24A-SR-F TR with auxiliary switch S2A TR

CAV controller variant RN, with actuator for switching between setpoint values

RN with actuator

Actuator for switching between setpoint values

EN (Generation 2) with actuator

B72

For motorised setpoint value adjustment on CAV terminal units and flow adjustment dampers, e.g. switching between qvmin and qvmax

Actuators for mechanically automatic CAV terminal units of the types EN, RN, VFC and flow adjustment damper of the type RN as well as the older version of the EN type (Generation 2)

Motorised, variable setpoint adjustment on the CAV terminal unit
24 V AC/DC supply voltage
Control input signal: Voltage signal 2 – 10 V DC
Specification of setpoint value range by mechanical stops
Positive lock connection with CAV terminal unit
With potential-free auxiliary switches for end position monitoring
Retrofit possible

General information

Application

Variable setpoint adjustment for mechanically automatic CAV terminal unit RN
Variable setpoint adjustment for mechanically automatic CAV terminal unit EN in generation 2 (with setpoint adjustment on angle scale)
Variable control: Setpoint signal 2 - 10 V DC, corresponds to the total angle of rotation (0 - 95°)
Min-max switching (2-point operation) with alternative wiring possible
Working range min-max mechanically adjustable

Application (auxiliary switch)

Auxiliary switch S2A for capturing damper blade positions (positions reached through actuator)
Volt-free contacts for signalling or activating switch functions
Two integrated switches, for example setpoint value min and max

Variants

B72 modulating actuator with additional auxiliary switch

Alternatively:
- B70 modulating actuator without auxiliary switch

Parts and characteristics

Overload-proof actuator LM24A-SR-F TR
Release button to allow for manual operation
Positive lock connection with the scale adjustment
Mechanical stops for setting the volume flow rate setpoints
Switch for reversing the direction of the drive
24 V AC/DC supply voltage
Setpoint and position signal 2 - 10 V DC (related to 0 - 95°)
Factory-fitted auxiliary switch S2A, adjustment by potentiometer

Commissioning

Set the mechanical stops according to the minimum and maximum volume flow rates
For further information on setting and control, see installation manual, e.g. CAV terminal unit RN

Technical information

Function, Technical data, Specification text, Order code

LM24A-SR-F TR with auxiliary switch S2A TR

1 Rotary knobs for setting the auxiliary switch
2 Auxiliary switches S2A TR (factory-fitted on actuator)
3 Connecting cable auxiliary switch S2A
4 Gear release
5 Control component LM24A-SR-F TR
6 Connecting cable control component LM24A-SR-F TR

Actuators for CAV terminal units make it possible to motorise the setpoint adjustment, which would otherwise have to be carried out manually on the setting scale.
For this purpose, the actuator B70, B72 moves the scale adjustment variably between a minimum
and a maximum position.

The setpoint adjustment on the scale is controlled by a 2 - 10 V DC voltage signal.
In the B70/B72 actuator, this voltage signal is mapped to the entire angle of rotation 0 - 95° of the actuator.

The scale range to be used for the setpoint specification must be determined during commissioning of the CAV controller using mechanical stops.
This limits the scale range that can actually be used.
The level of the setpoint signal must be adjusted to the mechanically selected angle range.

The 2 - 10 V DC output signal of the CAV actuator is merely a position feedback and not a volume flow rate actual value.
The output signal is mapped to the entire rotation angle 0 - 95° of the actuator.

In the B72 variant, two individual setpoint positions can be defined on site using auxiliary switch S2A and as switching contacts
be read out electrically.

Actuators for air terminal units of the types RN and EN (Generation 2)

Order code detail	Actuator			Auxiliary switch
Order code detail	Part number	Type	Supply voltage	Part number	Type
B72	M466DT6	LM24A-SR-F TR	24 V AC/DC	MM536AI3	S2A TR

, Actuator LM24A-SR-F

Supply voltage (AC)	24 V AC ± 20%, 50/60 Hz
Supply voltage (DC)	24 V DC ± 20 %
Power consumption operation	1 W
Power consumption – when idle	0.4 W
Power rating for cable sizing	2 VA
Control signal	2 – 10 V DC, Ra > 100 kΩ
Position feedback	2 – 10 V DC, 1 mA
Torque	5 Nm
Runtime for 90°	150 s
Connecting cable	4 × 0.75 mm², approx. 1 m long
IEC protection class	III (Protective extra-low voltage)
Protection level	IP 54
EC conformity	EMC according to 2014/30/EU, RoHS according to 2011/65/EU
Operating temperature (depends on the operating range of the control unit)	10 – 50 °C
Weight	0.5 kg

, Auxiliary switch S2A

Type of contact	2 changeover contact *1
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 according to 2014/30/EU, low voltage according to 2014/35/EU, RoHS according to 2011/65/EU
Operating temperature (depends on the operating range of the control unit)	10 – 50 °C
Weight	0.250 kg

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

Category

Continuous actuator with auxiliary switches

Application

Variable setpoint specification for constant volume flow controllers with capturing of the end positions

Supply voltage

24 V AC/DC

Interface/signalling

2 – 10 V DC for setpoint position
1-wire control for min/max position
2-wire control for min/max position

Connection

4-wire connecting cable (actuator)
6-core connection cable (auxiliary switch)

Interface information

Min / Max setpoint position can be set on site with mechanical stops

Hilfsschalter

Switch contacts for monitoring two positions:
- Stop position 1 - switching position adjustable 0 - 100 %
- Stop position 2 - switching position adjustable 0 - 100 %

Factory condition

Actuator and auxiliary switch factory-mounted on CAV terminal unit


NR-VAV	–	RN-B72
\|		\|
1		2

1 Type
NR-VAV Retrofit kit

2 Variant
RN-B72 modulating actuator 24 V AC/DC with auxiliary switch for CAV terminal unit RN
EN-B72 modulating actuator 24 V AC/DC for CAV terminal unit EN Generation 2 (setpoint value adjustment with angle scale)

Note:
This is the order code for retrofitting the actuator for a CAV terminal unit.
As a rule, the actuator is specified in the initial order via the order code of the basic device under the section Actuator for setpoint adjustment with the order codes B72.

Kombinationen Vollbild, VARIANTS

LM24A-SR-F TR, Terminal assignment

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

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B72

For motorised setpoint value adjustment on CAV terminal units and flow adjustment dampers, e.g. switching between qvmin and qvmax

General information

Technical information

Function, Technical data, Specification text, Order code

Kombinationen Vollbild, VARIANTS

Downloads

product information

Product data sheet B72

B72

For motorised setpoint value adjustment on CAV terminal units and flow adjustment dampers, e.g. switching between qvmin and qvmax

General information

Technical information

Function, Technical data, Specification text, Order code

Kombinationen Vollbild, VARIANTS

Downloads

product information

Product data sheet B72

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