How To Size Your Motor
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Spring Return Damper Actuators
Width (mm)and Height (mm)
250
500
750
1000
1250
1500
1750
2000
2250
2500
250 0.31NM
TF		 0.63NM
TF		 0.94NM
TF		 1.25NM
TF		 1.56NM
TF		 1.88NM
TF		 2.19NM
LF		 2.50NM
LF		 2.81NM
LF		 3.12NM
LF
500 0.63NM
TF		 1.25NM
TF		 1.89NM
TF		 2.50NM
LF		 3.12NM
LF		 3.75NM
LF		 4.38NM
NF		 5.00NM
NF		 5.63NM
NF		 6.25NM
NF
750 0.94NM
TF		 1.88NM
TF		 2.81NM
LF		 3.75NM
LF		 4.69NM
NF		 5.63NM
NF		 6.56NM
NF		 7.50NM
AFR		 8.44NM
AFR		 9.38NM
AFR
1000 1.25NM
TF		 2.50NM
LF		 3.75NM
LF		 5.00NM
LF		 6.25NM
NF		 7.50NM
AFR		 8.75NM
AFR		 10.00NM
AFR		 11.25NM
AFR		 12.50NM
AFR
1250 1.56NM
TF		 3.13NM
LF		 4.69NM
LF		 6.25NM
NF		 7.81NM
AFR		 9.38NM
AFR		 10.94NM
AFR		 12.50NM
AFR		 14.06NM
AFR		 .
1500 1.88NM
TF		 3.75NM
LF		 5.63NM
NF		 7.50NM
AFR		 9.38NM
AFR		 11.25NM
AFR		 13.13NM
AFR		 15.00NM
AFR		 . .
1750 2.19NM
LF		 4.38NM
NF		 6.56NM
NF		 8.75NM
AFR		 10.94NM
AFR		 13.13NM
AFR		 . . . .
2000 2.50NM
LF		 5.00NM
NF		 7.50NM
AFR		 10.00NM
AFR		 12.50NM
AFR		 15.00NM
AFR		 . Note 1 . .
2250 2.81NM
LF		 5.62NM
NF		 8.44NM
AFR		 11.25NM
AFR		 14.06NM
AFR		 . . . . .
2500 3.13NM
LF		 6.25NM
NF		 9.38NM
AFR		 12.50NM
AFR		 . . . . . .
Note 1: Larger Area Dampers Utilise Multiple Damper Actuators
Reference Table - Spring Return Damper Actuators
Actuator
Power Supply
Control Type
Torque (NM)
Approx. Max
Damper Size
TF230
TF24
TF24-SR
240V
24V
24V
On/Off
On/Off
0-10V Modulating
2
0.38m2
LF230
LF24
LF24-SR
240V
24V
24V
On/Off
On/Off
0-10V Modulating
4
0.75m2
NF230
NF24
NF24-SR
240V
24V
24V
On/Off
On/Off
0-10V Modulating
7
1.31m2
AFR230
AFR24
AFR24-SR
240V
24V
24V
On/Off
On/Off
0-10V Modulating
15
3.00m2
Non-Spring Return Damper Actuators
Width (mm) and Height (mm)
250
500
750
1000
1250
1500
1750
2000
2250
2500
250 0.31NM
CMU		 0.63NM
CMU		 0.94NM
CMU		 1.25NM
CMU		 1.56NM
CMU		 1.88NM
CMU		 2.19NM
LMU		 2.50NM
LMU		 2.81NM
LMU		 3.13NM
LMU
500 0.63NM
CMU		 1.25NM
CMU		 1.88NM
CMU		 2.50NM
LMU		 3.13NM
LMU		 3.75NM
LMU		 4.38NM
LMU		 5.00NM
LMU		 5.63NM
NMU		 6.25NM
NMU
750 0.94NM
CMU		 1.88NM
CMU		 2.81NM
LMU		 3.75NM
LMU		 4.69NM
LMU		 5.63NM
NMU		 6.56NM
NMU		 7.50NM
NMU		 8.44NM
NMU		 9.38NM
NMU
1000 1.25NM
CMU		 2.50NM
LMU		 3.75NM
LMU		 5.00NM
LMU		 6.25NM
NMU		 7.50NM
NMU		 8.75NM
NMU		 10.00NM
NMU		 11.25NM
SMU		 12.50NM
SMU
1250 1.56NM
CMU		 3.13NM
LMU		 4.69NM
LMU		 6.25NM
NMU		 7.81NM
NMU		 9.38NM
NMU		 10.94NM
SMU		 12.50NM
SMU		 14.06NM
SMU		 15.63NM
SMU
1500 1.88NM
CMU		 3.75NM
LMU		 5.63NM
NMU		 7.50NM
NMU		 9.38NM
NMU		 11.25NM
SMU		 13.13NM
SMU		 15.00NM
SMU		 16.88NM
SMU		 18.75NM
SMU
1750 2.19NM
LMU		 4.38NM
LMU		 6.56NM
NMU		 8.75NM
NMU		 10.94NM
SMU		 13.13NM
SMU		 15.31NM
SMU		 17.50NM
SMU		 19.69NM
SMU		 21.88NM
GMU
2000 2.50NM
LMU		 5.00NM
LMU		 7.50NM
NMU		 10.00NM
NMU		 12.50NM
SMU		 15.00NM
SMU		 17.50NM
SMU		 20.00NM
SMU		 22.50NM
GMU		 25.00NM
GMU
2250 2.81NM
LMU		 5.63NM
NMU		 8.44NM
NMU		 11.25NM
SMU		 14.06NM
SMU		 16.88NM
SMU		 19.69NM
SMU		 22.50NM
GMU		 25.31NM
GMU		 28.13NM
GMU
2500 3.13NM
LMU		 6.25NM
NMU		 9.38NM
NMU		 12.50NM
SMU		 15.63NM
SMU		 18.75NM
SMU		 21.88NM
GMU		 25.00NM
GMU		 28.13NM
GMU		 31.25NM
GMU
Reference Table - Non-Spring Return Damper Actuators
Actuator
Power Supply
Control Type
Torque (NM)
Approx. Max
Damper Size
CMU230
CMU24
CMU24-SR-R
240V
24V
24V
On/Off
On/Off
0-10V Modulating
2
0.38m2
LMU230
LMU24
LMU24-SR
240V
24V
24V
On/Off
On/Off
0-10V Modulating
5
1.00m2
NMU230
NMU24
NMU24-SR
240V
24V
24V
On/Off
On/Off
0-10V Modulating
10
2.00m2
SMU230
SMU24
SMU24-SR
240V
24V
24V
On/Off
On/Off
0-10V Modulating
20
4.00m2
GMU230
GMU24
GMU24-SR
240V
24V
24V
On/Off
On/Off
0-10V Modulating
40
8.00m2
Equation For Determining Damper Torque (NM)

Damper Torque = Damper Width x Damper Height x Force Generated By The Airflow

NB: In These Tables, The Force Generated By The Pressure And Velocity Of A Normal Air-conditioning System Is Approximately 5.00NM/m2.
In A Higher Pressure System, This Value Could Be As High As 20.00NM/m2.
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