Technical data sheet NRF24A-O

Technical data sheet NRF24A-O
Technical data sheet
Rotary actuator with emergency
control function for ball valves
• Nominal torque 10 Nm
• Nominal voltage AC/DC 24 V
• Control Open-close
• Deenergised open (NO)
Technical data
Electrical data
Functional data
Nominal voltage
Nominal voltage frequency
Nominal voltage range
Power consumption in operation
Power consumption in rest position
Power consumption for wire sizing
Connection supply / control
Parallel operation
AC/DC 24 V
50/60 Hz
AC 19.2...28.8 V / DC 21.6...28.8 V
6 W
2.5 W
8.5 VA
Cable 1 m, 2 x 0.75 mm²
Yes (note the performance data)
Torque motor
Torque spring return
Direction of rotation spring-return
Manual override
Angle of rotation
Running time motor
Running time emergency setting position
Sound power level motor max.
Position indication
Service life
Min. 10 Nm
Min. 10 Nm
Deenergised NO, valve open (A - AB = 100%)
By means of hand crank and locking switch
75 s / 90°
<20 s / 90°
45 dB(A)
Min. 60,000 emergency positions
Protection class IEC/EN
Protection class UL
Degree of protection IEC/EN
Degree of protection NEMA/UL
Certification IEC/EN
Certification UL
Mode of operation
Rated impulse voltage supply / control
Control pollution degree
Ambient temperature
Non-operating temperature
Ambient humidity
III Safety extra-low voltage
UL Class 2 Supply
NEMA 2, UL Enclosure Type 2
CE according to 2004/108/EC
IEC/EN 60730-1 and IEC/EN 60730-2-14
cULus according to UL 60730-1A, UL 60730-214 and CAN/CSA E60730-1:02
Type 1.AA
0.8 kV
95% r.h., non-condensing
Weight approx.
2.1 kg
Safety notes
• This device has been designed for use in stationary heating, ventilation and air
conditioning systems and is not allowed to be used outside the specified field of
application, especially in aircraft or in any other airborne means of transport.
• Only authorised specialists may carry out installation. All applicable legal or
institutional installation regulations must be complied during installation.
• The device may only be opened at the manufacturer‘s site. It does not contain any
parts that can be replaced or repaired by the user.
• The cables must not be removed from the device.
NRF24A-O • en-gb • 2014-10-15 • subject to changes
Rotary spring-return actuator, Open-close, AC/DC 24 V,
10 Nm
Safety notes
• The device contains electrical and electronic components and is not allowed to be
disposed of as household refuse. All locally valid regulations and requirements must
be observed.
Product features
Mode of operation
The actuator moves the valve to the operating position at the same time as tensioning
the return spring. The valve is turned back to the emergency position by spring force
when the supply voltage is interrupted.
Direct mounting
Simple direct mounting on the ball valve with only one screw. The mounting orientation
in relation to the ball valve can be selected in 90° steps.
Manual override
Manual actuation of the valve with manual elevator crank, engagement with the locking
switch at any position. Unlocking is manual or automatic by applying the operating
High functional reliability
Adjustable angle of rotation
The actuator is overload protected, requires no limit switches and automatically stops
when the end stop is reached.
Adjustable angle of rotation with mechanical end stop.
Electrical installation
• Connection via safety isolating transformer.
• Parallel connection of other actuators possible. Observe the performance data.
Wiring diagrams
AC/DC 24 V, open-close
Cable colours:
1 = black
2 = red
NRF24A-O • en-gb • 2014-10-15 • subject to changes
Rotary spring-return actuator, Open-close, AC/DC 24 V,
10 Nm
Dimensions [mm]
Dimensional drawings
Further documentation
• Overview Valve-actuator combinations
• Data sheets for ball valves
• Installation instructions for actuators and/or ball valves
• General notes for project planning
NRF24A-O • en-gb • 2014-10-15 • subject to changes
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