N20, N34 Series MN7220, MN7234
NON-SPRING RETURN DAMPER ACTUATOR
20/34 Nm (175/300 lb-in) FOR MODULATING CONTROL
PRODUCT DATA
These direct-coupled damper actuators provide modulating control for:
•rotary valves,
•air handling units,
•ventilation flaps,
•louvers, and
•reliable control for air damper applications with up to 50 sq.ft. (20 Nm / 175 lb-in) or 85 sq. ft. (34 Nm / 300 lb-in) (seal-less damper blades; air friction-dependent).
•New self-centering shaft adapter
•Access cover to facilitate connectivity
•Declutch for manual adjustment
•Mechanical end limits (MN7220 only)
•Field-installable auxiliary switches
•Rotation direction selectable by switch
•Mountable in any orientation (no IP54 if upside down)
•Mechanical position indicator
Supply voltage |
24 |
Vac ±20%, 50/60 Hz; |
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Vdc -10...+20% |
Nominal voltage |
24 |
Vac, 50/60 Hz; 24 Vdc |
All values stated hereinafter apply to operation under nominal voltage conditions.
Power consumption |
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MN7220 |
6 VA / 6 W |
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MN7234 |
8 VA / 6 W |
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Ambient limits |
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Ambient operating limits |
-5...+140 °F (-20...+60 °C) |
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Ambient storage limits |
-40...+175 °F (-40...+80 °C) |
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Relative humidity |
5...95%, non-condensing |
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Safety |
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Protection standard |
IP54 (non-USA models) |
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NEMA2 (USA models) |
Protection class |
II as per EN 60730-1 |
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Overvoltage category |
II |
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Lifetime |
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Full strokes |
60000 |
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Repositions |
1.5 million |
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Mounting |
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Round damper shaft |
3/8...1-1/16” (10...27 mm) |
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Square damper shaft |
3/8...11/16” (10...18 mm); |
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45° steps |
Shaft length |
min. 7/8” (22 mm) |
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Control signal |
0(2)...10 Vdc |
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0(4)...20 mA |
Input impedance |
100 kΩ [0...10 V] |
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Feedback signal |
500 Ωm [0...20 mA] |
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Limits |
± 1 mA at 0...10 V |
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Auxiliary switch (when included) |
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Rating |
5 A (resistive) / 3 A (inductive) |
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Triggering points |
5° / 85° |
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Torque rating |
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MN7220 |
175 lb-in (20 Nm) |
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MN7234 |
300 lb-in (34 Nm) |
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Runtime |
95 sec (60 Hz) / 110 sec (50 Hz) |
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Rotation stroke |
95° ± 3° |
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Dimensions |
see “Dimensions” on page 8 |
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Weight |
3 lbs. (1.35 kg) |
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Noise rating |
40 dB(A) max. at 1 m |
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63-2587-1
N20, N34 SERIES MN7220, MN7234
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M – Electrical motor |
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N – Fail Safe Function (Non-Spring Return) |
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61 – 24V Floating Control |
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72 – 24V Modulating Control |
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20 – 20 Nm (175 lb-in) |
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34 – 34 Nm (300 lb-in) |
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A – Standard Model |
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1 – No Feedback |
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2 – Voltage Feedback Signal |
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0 – No Internal Auxiliary Switches |
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2 – Two Internal Auxiliary Switches |
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XX – System Controlled Numbers |
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M |
N |
72 |
20 |
A |
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0 |
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Fig. 1. Product Identification System |
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OPERATION/FUNCTIONS |
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Legend for Fig. 2. Setting units and control elements: |
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1. |
Self-centering shaft adapter |
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2. |
Retainer clip |
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3. |
Rotational angle scales (0...90° / 90...0°) |
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4. |
Mechanical end limits (20 Nm [175 lb-in] models, only) |
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5. |
Declutch button |
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6. |
Anti-rotation bracket |
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7. |
Rotation direction switch |
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8. |
Access cover |
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9. |
Internal auxiliary switch wire |
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10. |
Power and control wire |
The delivery package includes the actuator itself, parts 1 through 10 (see Fig. 2; in the case of U.S. models – e.g. MN7220 – parts 1 through 8), the anti-rotation bracket screws, and the SM mounting plate and screws.
The actuator is capable of being operated by several controllers providing Vdc or mA output.
Fig. 2. Setting units and control elements
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:
1.Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory).
2.Honeywell Customer Care 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
63-2587—1 |
2 |
The control signal and the corresponding rotation direction (clockwise or counterclockwise) can be selected using the rotation direction switch (see part Rotation direction switch in Fig. 2), thus eliminating the need to re-wire. To ensure tight closing of the dampers, the actuator has a total rotation stroke of 95°.
As soon as operating power is applied, the actuator may start to run. When power is removed, the actuator remains in position. For actuator-controller wiring instructions, see section “Wiring” on page 5.
Fig. 3. Rotation Direction Switch
Table 1. Feedback/control signal values
Rotation direction |
Feedback/control signal when |
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actuator is |
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switch position |
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totally |
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totally |
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Y=2 |
/2...10V |
U = 2 V |
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U = 10 V |
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Y=0 |
/0...10V* |
U = 0 V |
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U = 10 V |
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Y=0 |
/10...0V |
U = 10 V |
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U = 0 V |
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Y=2 |
/10...2V |
U = 10 V |
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U = 2 V |
* Default shipping position.
Feedback Signal and Manual Adjustment
If, while the actuator is not rotating, the user declutches it and manually repositions the shaft adapter, the feedback signal will then follow the new position at which the shaft adapter has been left.
In case the power to the actuator fails, after re-applying power, the actuator acknowledges its present position and follows the signal from the controller. This makes it unnecessary for the actuator to employ autoadaption in order to re-map the control signal settings.
The actuators are equipped with two dip switches accessible after removing the access cover (see Fig. 4).
N20, N34 SERIES MN7220, MN7234
voltage/current control signal dip switch (OFF)
autoadapt dip switch for normal operation (ON)
Fig. 4. Dip switches (view with PCB at bottom)
Autoadapt Dip Switch for Normal Operation
In its default shipping position, the autoadapt dip switch for normal operation is set to ON as shown in Fig. 4. Dip switches (view with PCB at bottom)4. If it is set to OFF, no autoadapting is performed, and the control signal map remains constant.
The autoadapt functionality does not have to be triggered. Rather, the SmartAct actuator does this automatically when the min. and max. control signals are provided (see Fig. 5); the feedback signal is likewise autoadapted.
Fig. 5. Actuator positioning curve
In order to make use of the autoadapt functionality, proceed as follows:
1.Set the autoadapt dip switch to the ON position.
2.If necessary, limit the stroke to the desired range using the mechanical end limits.
3.Drive the actuator to the left end limit (totally counterclockwise) by setting the control signal as specified in Table 1. Feedback/control signal values1.
4.Drive the actuator to the right end limit (totally clockwise) by setting the control signal as specified in Table 1. Feedback/control signal values1. The stroke has now been limited to 0...100% of the control signal range.
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63-2587—1 |