Greenheck MP-220A Installation Manual
®
Field Installation Instructions
Motor Pack Contents
1. Actuator
2. Actuator Bracket
3. Actuator Arm Assembly
4. Connecting Links
5. Actuator Spring
All necessary hardware included
Document Number 463544
MP-220A Motor Pack
UL Listed Electric Actuators with Spring Return
for use with WD-200 Series Dampers
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 #10 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 approximately 1/8” away from 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 Fig. 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 in Fig 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 crankarm
impacts the rubber bumper.
5. Actuators are supplied with junction box and
covers. When wiring, make sure the supply voltage
agrees with the actuator voltage. On dual voltage
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 page 2
and 3 for 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 panel dampers, the actuator
is installed as shown on page 1 in the multiple panel
view. On triple panel dampers, two actuators are
installed as shown in the multiple panel view.
Chart 1
Motor Packs 24V (50/60 Hz)
Stall Amps .66 .15 .07 .041
Spec ID# G24 G110-240 G-110-240 G460
110 thru 120V
(50/60Hz)
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
a 120V motor pack is required.
208 thru 240V
(50/60 Hz)
460V (60Hz)
Typical Wiring Diagrams
Wiring diagrams are shown for motor packs and dampers installed with power ventilator fan equipment with
single speed motor. The damper will open when the fan is on and close when the fan is off. For connection to
2-speed fan motors or for other control sequences consult the factory. The wiring diagrams shown with end
switches are for applications where it is desirable to have the damper fully open before fan start-up.
Single Phase
Three Phase
Loading...