B70

Actuator LM24A-SR-F 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

B70

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 RN and the older EN version (Generation 2)

Motorised, variable setpoint value 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
Retrofit possible

General Information

Application

Variable setpoint adjustment for mechanically automatic CAV control units RN
Variable setpoint adjustment for mechanically automatic KVS control units EN in generation 2 (with setpoint adjustment on angular 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

Commissioning

Alternatively:
B72 variable actuator with additional auxiliary switch; separate product data sheet

Parts and characteristics

Overload-proof drive 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 actuator
24 V AC/DC supply voltage
Setpoint and position signal 2 - 10 V DC (based on 0 - 95°)

Commissioning

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

Technical information

Functional description, Technical data, Specification text, Order code

Actuator LM24A-SR-F TR

1 Positive lock connection for scale adjustment
2 Mechanical stops for rotation stop
3 Direction of rotation switch
4 Gear release
5 Connecting cable

Actuators for CAV control units make it possible to motorise the setpoint adjustment, which would otherwise have to be carried out manually on the setting scale. 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 set during commissioning of the CAV control unit using mechanical stops. This limits the scale range that can actually be used. The value 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 an actual volume flow rate value. The output signal is mapped to the entire rotation angle 0 - 95° of the actuator.

Actuators for volume flow controllers type RN and EN (Generation 2)

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

, Actuator LM24A-SR-F

Supply voltage (AC voltage)	24 V AC ± 20%, 50/60 Hz
Supply voltage (DC voltage)	24 V DC ± 20 %
Power consumption operation	1 W
Power consumption idle position	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 to 50 °C
Weight	0.5 kg

Category

Constant actuator

Application

Variable setpoint specification for constant volume flow controllers

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

Connection cable 4-wire

Interface information

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

Factory condition

Actuator factory-mounted on CAV controller


NR-VAV	–	RN-B70
\|		\|
1		2

1 Type
NR-VAV Retrofit kit
2 Variant
RN-B70 modulating actuator 24 V AC/DC for CAV terminal unit RN
EN-B70 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 B70.

Variants, VARIANTS

LM2424A-SR-F TR Connecting cable core identification

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

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B70

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

General Information

Technical information

Functional description, Technical data, Specification text, Order code

Variants, VARIANTS

Downloads

product information

Prodcut data sheet B70

B70

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

General Information

Technical information

Functional description, Technical data, Specification text, Order code

Variants, VARIANTS

Downloads

product information

Prodcut data sheet B70

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