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Installation Instructions
1. The MP-220A motor pack is designed for installation on model WD-200 series backdraft dampers only.
2. For single panel damper, insert tab of motor bracket into the slot on the side of the frame. For dampers with center
bars, the tab of the motor bracket should be inserted into the slot on the bottom of the center bearing rail.
Position bracket over the two holes on the bottom of the frame and secure with the hardware provided.
3. Loosely connect the actuator arm assembly to the connecting link using the provided hardware. Fasteners should
be placed as far apart as possible to provide greater stability to the linkage. The connecting links may need to
be modified or shortened on some dampers sizes. To make the adjustment easier, release the spring from the
spring adjustment bracket.
Note: The connecting link(s) have been installed on the damper at the factory.
4. To adjust the actuator linkage, position the actuator arm (attached to the damper) approximately
the rubber bumper. While holding the damper blades closed, tighten the fasteners between the connecting link
and actuator arm assembly. Place the spring onto the first hook of the adjustment bracket (see figure on page
1). Operate the damper manually. Verify that the linkage and fasteners do not interfere with any components of
the assembly and that the damper blades close completely when released. To increase spring tension, move
the spring to the next hook as shown on page 1.
Note: It is important to avoid too much spring tension; use just enough tension to close the damper. Too much
tension could impair opening of the damper or cause damage to the components as the crank arm impacts the
rubber bumper.
5. Actuators are supplied with junction box and cover. When wiring, make sure the supply voltage agrees with the
actuator voltage. On dual voltages motor packs, be sure to connect the proper motor leads for the correct
voltage and insulate any unused wire. The voltage of each specific model is indicated on a label that is affixed
to the actuator (see typical wiring diagrams).
6. If the damper fails to open properly, check for one of the following causes:
• Check for an 'out of square' or racked damper
• Check for mounting screws interfering with the blade and linkage rotation
• Spring tension too great
• Excessive voltage drop
• Excessive negative pressure in the building
If actuator fails to function:
• Check for correct voltage
• Check for proper wiring
Motor Pack Quantity
More than one motor pack may be required depending on damper size:
• On single panel dampers, the actuator is installed as shown on page 1 in the single panel view
• On double or triple panel dampers, the actuator(s) is installed as shown on page 1 in the multiple panel view.
Actuator Specifications
MP-220A motor pack uses a single phase shaded pole stall type impedance protected electric actuators and are
supplied in various voltages (see chart). For 277, 380, 575, or 600 volt operation a transformer and 120V motor pack
is required.
2
MP-220A Motor Pack
Motor Packs
Stall Amps
24V (50/60 Hz)
.66
110 - 120V
.15
(50/60 Hz)
208 - 240V
.07
(50/60 Hz)
460V (60 Hz)
.041
1
Spec ID#
G24
G110-240
G110-240
G460
⁄
in. away from
8
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