Honeywell MN7220, N20, N34, MN7234 User Manual

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N20, N34 Series MN7220, MN7234

NON-SPRING RETURN DAMPER ACTUATOR

20/34 Nm (175/300 lb-in) FOR MODULATING CONTROL

PRODUCT DATA

GENERAL

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).

FEATURES

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

SPECIFICATIONS

Supply voltage

24

Vac ±20%, 50/60 Hz;

 

24

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

 

MN7220

6 VA / 6 W

MN7234

8 VA / 6 W

Ambient limits

 

Ambient operating limits

-5...+140 °F (-20...+60 °C)

Ambient storage limits

-40...+175 °F (-40...+80 °C)

Relative humidity

5...95%, non-condensing

Safety

 

Protection standard

IP54 (non-USA models)

 

 

 

NEMA2 (USA models)

Protection class

II as per EN 60730-1

Overvoltage category

II

Lifetime

 

Full strokes

60000

Repositions

1.5 million

Mounting

 

Round damper shaft

3/8...1-1/16” (10...27 mm)

Square damper shaft

3/8...11/16” (10...18 mm);

 

 

 

45° steps

Shaft length

min. 7/8” (22 mm)

Control signal

0(2)...10 Vdc

 

 

 

0(4)...20 mA

Input impedance

100 kΩ [0...10 V]

Feedback signal

500 Ωm [0...20 mA]

 

Limits

± 1 mA at 0...10 V

Auxiliary switch (when included)

Rating

5 A (resistive) / 3 A (inductive)

Triggering points

5° / 85°

Torque rating

 

MN7220

175 lb-in (20 Nm)

MN7234

300 lb-in (34 Nm)

Runtime

95 sec (60 Hz) / 110 sec (50 Hz)

Rotation stroke

95° ± 3°

Dimensions

see “Dimensions” on page 8

Weight

3 lbs. (1.35 kg)

Noise rating

40 dB(A) max. at 1 m

 

 

 

 

 

 

 

 

 

 

 

 

63-2587-1

N20, N34 SERIES MN7220, MN7234

MODELS

 

M – Electrical motor

 

 

 

 

 

 

 

 

 

 

 

 

 

N – Fail Safe Function (Non-Spring Return)

 

 

 

 

 

 

 

61 – 24V Floating Control

 

 

 

 

 

 

 

72 – 24V Modulating Control

 

 

 

 

 

 

 

 

 

20 – 20 Nm (175 lb-in)

 

 

 

 

 

 

 

 

 

34 – 34 Nm (300 lb-in)

 

 

 

 

 

 

 

 

 

 

 

A – Standard Model

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 – No Feedback

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2 – Voltage Feedback Signal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0 – No Internal Auxiliary Switches

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2 – Two Internal Auxiliary Switches

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

XX – System Controlled Numbers

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

M

N

72

20

A

 

2

0

XX

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig. 1. Product Identification System

OPERATION/FUNCTIONS

 

 

 

 

 

 

 

Legend for Fig. 2. Setting units and control elements:

 

 

 

 

 

 

 

 

 

 

 

1.

Self-centering shaft adapter

 

 

 

 

 

 

 

 

 

 

 

2.

Retainer clip

 

 

 

 

 

 

 

 

 

 

 

3.

Rotational angle scales (0...90° / 90...0°)

 

 

 

 

 

 

 

 

 

 

 

4.

Mechanical end limits (20 Nm [175 lb-in] models, only)

 

 

 

 

 

 

 

 

 

 

 

5.

Declutch button

 

 

 

 

 

 

 

 

 

 

 

6.

Anti-rotation bracket

 

 

 

 

 

 

 

 

 

 

 

7.

Rotation direction switch

 

 

 

 

 

 

 

 

 

 

 

8.

Access cover

 

 

 

 

 

 

 

 

 

 

 

9.

Internal auxiliary switch wire

 

 

 

 

 

 

 

 

 

 

 

10.

Power and control wire

Contents of Package

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.

Modulating Control

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

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Honeywell MN7220, N20, N34, MN7234 User Manual

Rotary Movement

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.

Rotation Direction Switch

Fig. 3. Rotation Direction Switch

Table 1. Feedback/control signal values

Rotation direction

Feedback/control signal when

 

 

actuator is

switch position

 

 

totally

 

 

 

totally

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Y=2

/2...10V

U = 2 V

 

 

U = 10 V

Y=0

/0...10V*

U = 0 V

 

 

U = 10 V

Y=0

/10...0V

U = 10 V

 

 

U = 0 V

Y=2

/10...2V

U = 10 V

 

 

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.

Power Off/On Behavior

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.

Dip Switches

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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