N20, N34 Series MN7220, MN7234
NON-SPRING RETURN DAMPER ACTUATOR
20/34 Nm (175/300 lb-in) FOR MODULATING CONTROL
PRODUCT DATA
SPECIFICATIONS
Supply voltage
24 Vac ±20%, 50/60 Hz;
24 Vdc -10...+20%
24 Vac, 50/60 Hz; 24 Vdc
Nominal voltage
All values stated hereinafter apply to operation under
nominal voltage conditions.
Power consumption
MN7220
MN7234
6 VA / 6 W
8 VA / 6 W
Ambient limits
Ambient operating limits
Ambient storage limits
Relative humidity
Safety
-5...+140 °F (-20...+60 °C)
-40...+175 °F (-40...+80 °C)
5...95%, non-condensing
Protection standard
IP54 (non-USA models)
NEMA2 (USA models)
II as per EN 60730-1
II
Protection class
Overvoltage category
Lifetime
Full strokes
Repositions
Mounting
60000
1.5 million
GENERAL
These direct-coupled damper actuators provide modulating
control for:
Round damper shaft
Square damper shaft
3/8...1-1/16” (10...27 mm)
3/8...11/16” (10...18 mm);
45° steps
min. 7/8” (22 mm)
0(2)...10 Vdc
•
•
•
•
•
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).
Shaft length
Control signal
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)
FEATURES
Rating
5 A (resistive) / 3 A (inductive)
Triggering points
Torque rating
MN7220
MN7234
Runtime
5° / 85°
•
•
•
•
•
•
•
•
New self-centering shaft adapter
Access cover to facilitate connectivity
Declutch for manual adjustment
175 lb-in (20 Nm)
300 lb-in (34 Nm)
95 sec (60 Hz) / 110 sec (50 Hz)
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
Rotation stroke
Dimensions
Weight
95° ± 3°
see “Dimensions” on page 8
3 lbs. (1.35 kg)
Noise rating
40 dB(A) max. at 1 m
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N20, N34 SERIES MN7220, MN7234
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°.
voltage/current control signal
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.
dip switch (OFF
)
autoadapt dip switch for
normal operation (ON
)
Rotation Direction Switch
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.
Fig. 3. Rotation Direction Switch
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.
Table 1. Feedback/control signal values
Feedback/control signal when
Rotation direction
actuator is
switch position
totally
U = 2 V
U = 0 V
U = 10 V
U = 10 V
totally
Y=2 /2...10V
Y=0 /0...10V*
Y=0 /10...0V
Y=2 /10...2V
U = 10 V
U = 10 V
U = 0 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.
Fig. 5. Actuator positioning curve
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.
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.
Dip Switches
The actuators are equipped with two dip switches accessible
after removing the access cover (see Fig. 4).
3
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N20, N34 SERIES MN7220, MN7234
The mechanical end limits must be securely fastened in place
as shown in Fig. 8. Correct / incorrect tightening of end limits8.
Specifically, it is important that they properly mesh with the
rotational angle scales when the screws are tightened.
Voltage/Current Control Signal Selection Dip Switch
In its default shipping position, the voltage/current control
signal dip switch (see Fig. 4) is set to OFF (= voltage control).
as shown in Fig. 4. Setting it to ON results in current control.
Position Indication
The hub adapter indicates the rotation angle position by means
of the rotational angle scales (0...90° / 90...0°).
90 90
60
60
30
0
30
0
Fig. 8. Correct/incorrect tightening of end limits
Internal Auxiliary Switches
The internal auxiliary switches are set to change from
“common” to “normally open” at angles of 5° and 85°,
respectively, from the totally counterclockwise position.
Fig. 6. Position indication
Manual Adjustment
actuator scale: clockwise
IMPORTANT
In order to prevent equipment damage, you must
-2.5° 0°
5°
10°
10°
15°
75°
80°
80°
85°
90° 92.5°
CCW internal
auxiliary switch
CW internal
auxiliary switch
remove power before manual adjustment.
auxiliary switch scale
After removing power, the gear train can be disengaged using
the declutch button, permitting the actuator shaft to be
manually rotated to any position. The feedback signal will then
follow the new position.
0°
5°
15°
75°
85°
90°
actuator scale: counterclockwise
92.5° 90°
85°
80°
75°
15°
10°
5°
0° -2.5°
Limitation of Rotation Stroke
Fig. 9. Internal auxiliary switches
Two mechanical end limits (adjustable in 3° increments) are
provided (20 Nm [175 lb-in] models, only) to limit the angle of
rotation as desired (see Fig. 7).
Override
If terminal 3 of the terminal strip (see section “Wiring
Diagrams” on page 6) is unplugged, the stroke will be 0%;
reversing the rotation direction using the rotation direction
switch will result in a max. stroke of 100%. If terminal 3 is
jumped with terminal 1 (24 V), the stroke will be 50%.
INSTALLATION
These actuators are designed for single-point mounting.
IMPORTANT
In order to prevent equipment damage, you must
remove power or set the rotation direction switch to
the “Service/Off” position before manual operation.
Fig. 7. Mechanical end limits
Mounting Instructions
All information and steps are included in the Installation
Instructions supplied with the actuator.
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N20, N34 SERIES MN7220, MN7234
IMPORTANT
Mounting Position
Remove power before detaching the access cover.
Once the access cover has been removed, please
take care to avoid damaging any of the parts now
accessible.
The actuators can be mounted in any desired orientation (no
NEMA2 or IP54 if mounted upside down; see Fig. 10). Choose
an orientation permitting easy access to the actuator's cables
and controls.
NEMA2
IP54
NEMA2
IP54
NEMA2
IP54
NEMA2
IP54
Fig. 11. Access cover
Depending upon the model, the access cover may have one or
two terminal strips, including a layout with a description for
each of the terminals.
Fig. 10. Mounting for IP54/NEMA2
Mounting Bracket and Screws
If the actuator is to be mounted directly on a damper shaft, use
the mounting bracket and screws included in the delivery
package.
Self-Centering Shaft Adapter
The self-centering shaft adapter can be used for shafts having
various diameters (3/8...1-1/16” [10...27 mm]) and shapes
(square or round).
In the case of short shafts, the shaft adapter may be reversed
and mounted on the duct side.
Stroke Limitation with Mechanical End Limits
The mechanical end limits (20 Nm [175 lb-in] models, only)
enable the stroke to be limited from 0...90° in increments of 3°.
Wiring
Fig. 12. Actuator with access cover removed
Access cover
To facilitate wiring the actuator to the controller, the access
cover can be detached from the actuator.
5
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N20, N34 SERIES MN7220, MN7234
Wiring Diagrams
MN7220/MN7234
24 Vac 24 Vdc
~
1
1~
2
2
3Y
5U
0(2)...10 Vdc
0(4)...20 mA
3Y
5U
0(2)...10 Vdc
TERMINAL STRIP 1
Connect via safety
isolating transformer!
!
MODULATING CONTROL
MN7220 WITH SWITCHES
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
S5
S6
24 Vac 24 Vdc
1
~
1~
2
2
0(2)...10 Vdc
0(4)...20 mA
3Y
TERMINAL STRIP
3Y
0(2)...10 Vdc
5U
5U
Connect via
!
isolating
AUXILIARY
AUXILIARY
MODULATING
NOTE: Internal auxiliary switches S1 and S4 must be connected to the same power source.
connecting cable
terminal
name
1~
24 Vac∼ / 24 Vdc+
24 Vac⊥ / 24 Vdc-
2⊥
3Y
5U
S1
S2
S3
S4
S5
S6
supply and signal lines
0(2)...10 Vdc / 0(4)...20 mA control signal
0(2)...10 V feedback signal
Common
CCW (left)
5°
normally closed
normally open
auxiliary switched
(when included)
Common
CW (right)
85°
normally closed
normally open
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N20, N34 SERIES MN7220, MN7234
DIMENSIONS
100 mm (3-15/16”)
95°
shaft
adapter
shaft
adapter (reverse)
90
60
30
0
20.6 mm
(1-3/16”)
92 mm (3-5/8”)
min. 60 mm (2-3/8”)
132 mm (5-3/16”)
230 mm [+/- 0.5 mm] (9-1/16” [+/-1/64”])
20 mm (25/32”)
anti-rotation bracket
7 mm (9/32”)
13 mm (1/2”)
5 mm (+0.05, -0.10 mm)
25/128” (+0.002, -0.004”)
2 mm (5/64”)
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
customer.honeywell.com
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Scarborough, Ontario M1V 4Z9
® U.S. Registered Trademark
© 2005 Honeywell International Inc.
63-2587—1 M.S. Rev. 10-05
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