tion allows energy conservation.
Large torque is assured despite compact, lightweight
design.

Model MY9050A damper actuator conforms to all the
applicable standards of CE Marking.
Rotary switch on the front surface easily changes the
motor rotating direction.
Simple physical structure facilitates installation on most
types of the damper shafts.
Optional auxiliary devices offer a variety of applications.
Model MY9050A is user-friendly to operate as well as to
install and set up.
AB-6724
2
Safety Instructions
Please read instructions carefully and use the product as specified in this manual. Be sure to keep this manual near by for ready
reference.
Usage Restrictions
This product is targeted for general air conditioning. Do not use this product in a situation where human life may be affected. If
this product is used in a clean room or a place where reliability or control accuracy is particularly required, please contact
Yamatakes sales representative. Yamatake Corporation will not bear any responsibility for the results produced by the
operators.
WARNING
Do not disassemble the product. Electrical shock or equipment damage may result.
Operate the product within the service life, and avoid application that keeps product operating cycle excessively
frequent. Overuse of the product may cause fire or product damage.
CAUTION
Installation and wiring must be performed by qualified personnel in accordance with all applicable safety
standards.
This product must be operated under the operating conditions (power, temperature, humidity, vibration, shock,
installation position, atmospheric condition, etc) specified in this manual to prevent equipment damages.
This product must be operated within its rated operating ranges specified in this manual. Failure to comply will
cause equipment damages.
Do not install the product in a location close to a steam coil or a hot-water coil. High temperature radiation may
result in an actuator malfunction.
Do not put heavy load on the product. It may get damaged.
All wiring must comply with local codes of indoor wiring and electric installation rules.
This product does not have a power switch. Be sure to provide a power circuit breaker in the power source.
To prevent product damage, always disconnect the power supply from the product before performing any wiring
and installation.
Make sure all the wires are tightly connected. Incomplete connection may result in an actuator malfunction.
Do not touch the moving part of the product in operation. Personal injury may result.
Dispose of this product as an industrial waste according to the local regulations. Do not recycle all or part of this
product.
AB-6724
3
Specifications
Item Specification
Model number
MY9050A1001
Action Proportional
action
Power supply voltage
24 V AC
± 20 %, 50 Hz/60 Hz
Power consumption
6 VA (in operation)
Rotating angle
Max. 95
° (mechanical imit)
Operating time
Approx. 150 s
Torque at the rated voltage
20 N
m
Ambient operating conditions
-20
°C to 50 °C, 95 %RH or less (non-condensing)
(This product is not rain-proof and thus is for indoor use only.)
Transport/storage conditions
-20
°C to 60 °C, 95 %RH or less
Name Description
Power LED /
Adaption switch
Red LED is ON during power ON. /
While the power LED is ON, actuator operation mode is switched to
Adaption mode*
1
by pressing the power LED.
Indicator LED / Adaption switch
Operation LED
Yellow LED is ON while the actuator operation is in Adaption mode or
in Synchronisation mode*
1
.
Enclosure rating
Dust proof and drip-proof equivalent to IEC IP54
(Cable conduit must be facing downward.)
Cable 0.75
mm
2

× 3-cores, 1 m long
Material / Color
PC-GF10 / Silver gray
Weight
Approx. 910 g
Applicable damper shaft
Circular:
10 mm to 20 mm, 42 mm long or longer
Square: 10 mm diagonal to 20 mm diagonal, 42 mm long or longer
Accessories
M4 tapping screws × 2
Position indicator ring × 1
Universal bracket × 1
Installation instruction sheet × 1
Auxiliary devices
(Separate order is required.)
Power transformer: Model AT72-J1
Auxiliary potentiometer*
2
: Model QY9010A1014
Auxiliary switch (SPDT × 1)*
2
: Model QY6051A1001
Auxiliary switch (SPDT × 2)*
2
: Model QY6051B1001
Mounting bracket for replacement (for replacing Model MY9040A)*
3
: Model Z-SMA
Requirements for order
Product model number (Model MY9050A1001)
Auxiliary device model number (if necessary)
Notes:
1. For details of Adaption mode and Synchronisation mode, refer to Damper Setting Functions and Setting sections.
2. Multiple auxiliary switches or auxiliary potentiometers cannot be connected. Connect single auxiliary potentiometer or auxiliary switch.
3. Mounting dimensions of Model MY9050A are different from those of Model MY9040A (former model). For replacing Model MY9040A with
Model MY9050A, the mounting bracket Model Z-SMA allows no change of the universal bracket mounting position.

Damper Setting Functions
Function Description
Adaption
Rotation angle of the damper actuator to be changed is automatically memorized (adapted) by pressing the power
LED/Adaption switch.
Synchronisation
Damper actuator position and actual damper position are matched (synchronized) by pressing the gear release
button/Synchronisation switch.

AB-6724
4
Dimensions
Actuator



































Figure 1. Dimensions (mm) and parts identification: Damper actuator

56
139
64
200
M
a
i
n
t
enanc
e
cl
earanc
e
100
Mai
n
te
nan
ce
cl
ear
an
ce
88
30

131

41
37.
5

37.
5
25
.
5



25.
5
23
99
14.5

5.1
4.2
30
100.6
3.6
97
37.
5


37.
5
23
5.
2
100
Mai
n
te
nan
ce
cl
ear
an
ce AB-6724
5
Universal bracket











Figure 2. Dimensions (mm): Universal bracket

Parts Identification


















Figure 3. Parts identification
Synchronisation:
When the gear release button / Synchronisation switch is pressed during power ON, the actuator fully closes the damper regardless of
control signal output from the controller. Then, the actuator operates the damper in response to the control signal. Actuator thus
synchronizes its position with the actual damper position.

IMPORTANT:

Perform Synchronisation while AHU is OFF. Synchronisation may damage the AHU and damper.


180
11 12
72
12
4.
3
6
12
5
2
7
2
2 pan-head tapping screws (slotted, M4
× 12, 1.4 pitch)
equivalent to JIS* B 1115-1976 are attached to the
universal bracket.


JIS: Japanese Industrial Standards
Position indicator ring

Fastening nut
Shaft clamp
Rotary switch
(for rotating direction changeover)
Power LED / Adaption switch
Operation LED
Rotation angle adjuster (mechanical stopper)
Gear release button / Synchronisation switch*
(Power OFF: for manually opening and closing damper
Power ON: for synchronisation) AB-6724
6
Installation CAUTION
To prevent product damage, always disconnect
the power supply from the product before
performing installation.

IMPORTANT:

Avoid application that keeps product operating
cycle excessively frequent.

Meet the rotating direction of the actuator with the
damper rotating direction.

Tighten the screws so that the actuator is securely
assembled with the damper.

For the product installation, secure maintenance
clearance shown in Fig. 1.

Installation procedure
1) Fully close the damper shaft.










Figure 4. Damper shaft

2) Fully close the actuator Model MY9050A, and mount it
to the damper shaft. Finger-tighten the fastening nuts of
the shaft clamp to temporarily fix the actuator.










Figure 5. Temporal installation of the actuator body

3) With the gear release button pressed , manually rotate
the shaft clamp until it is in the position shown in Fig. 6.
Then, insert the universal bracket into the slit of the
actuator and fix the bracket onto the damper with the two
M4 tapping screws.









Figure 6. Attaching the universal bracket

4) Manually rotate the shaft clamp back to the fully closed
position with the gear release button pressed. At this
time, be sure to leave a clearance (approx. 1 mm)
between the shaft clamp and the rotation angle adjuster
(mechanical stopper). Using a wrench, tighten the
fastening nuts of the shaft clamp to completely fix the
actuator.









Figure 7. Complete installation of the actuator body

5) Attach the position indicator ring to the damper shaft so
that the tip of the damper blade and the pointer of the
indicator ring point to the same direction.
Adjust the rotation angle adjuster on the fully open side
depending on the damper rotating angle.











Figure 8. Attaching the position indicator ring
Damper shaft cross section

10 to 20

10
to
20
Unit:
mm
42
Damper shaft
Rotate to close.
1. Press.
2. Rotate to close.
3. Tighten.
2. Finger-tighten.
1. Mount.
1. Press.
3. Insert.
Universal bracket
M4 tapping screws
2. Rotate.
Tip of the
damper blade
Pointer of the
indicator ring
Damper shaft in fully closed position
Damper blade
1. Attach.
2. Adjust.
65
° AB-6724
7
Wires Connection
Connect the lead wires as follows: