Honeywell MN7220, N20, N34, MN7234 User Manual

N20, N34 Series MN7220, MN7234

NON-SPRING RETURN DAMPER ACTUATOR
20/34 Nm (175/300 lb-in) FOR MODULATING CONTROL

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

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

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]

500 Ωm [0...20 mA]

Feedback signal

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

PRODUCT DATA

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

MN7220A20XX

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

Fig. 1. Product Identification System

OPERATION/FUNCTIONS

Fig. 2. Setting units and control elements

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.

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

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°.

N20, N34 SERIES MN7220, MN7234

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

switch position

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/control signal when

actuator is

totally totally

voltage/current control signal

autoadapt dip switch for

normal operation ( )

Fig. 4. Dip switches (view with PCB at bottom)

dip switch ( )

ON

OFF

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.

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).

3 63-2587—1

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 counter-

clockwise) 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.