MP-323 01-97
Motor Pack Contents
1. Actuator
2. Actuator Bracket
3. Actuator Arm Assembly
4. Connecting Links
5. Actuator Spring
All necessary hardware included
Actuator Specifications
The MP-323 motor pack uses a single phase, 60hz, shaded
pole, stall type impedance protected electric actuator.
Specific model depends on the voltage selected.
Greenheck Part #453446
Black
Black
Green
Actuator Wiring Diagram
L1
L2
M
Field Installation Instructions for
Multi Products
MP-323 Motor Pack
UL Listed Electric Actuators With Spring Return
For Use With WD-323 Dampers
VENCO PRODUCTS
GREENHECK
®
1. The MP-323 motor pack is designed for installation on
Model WD-323 backdraft dampers only. When properly
installed, the damper will be vertically mounted to
exhaust air.
2. Position the motor bracket into the inside lower left
corner of the damper.
3. While holding the bracket snug into the corner and
keeping it square to the damper frame, trace the
location of the two mounting holes onto the damper
frame.
4. Mount the motor pack to the damper frame using
hardware provided.
5. Connect the motor arm to the blade as shown in Detail
“A”.
6. With the blades in the fully open position, rotate the
motor arm away from the damper until it seats firmly
against the rubber stop. Hold the arm in this postion
while tightening the two adjustment screws on the
motor linkage. (Adjustment screws should be placed as
far apart as possible to provide greater stability to the
linkage.)
7. Release the motor arm to allow the blades to close.
8. If the damper fails to function properly, check for one of the
following causes:
A. Motor pack fails to close the damper completely.
• Check for an ‘out of square’ or racked damper.
• Insufficient spring tension.
B. Motor pack fails to open the damper completely.
• Check for an ‘out of square’ or racked damper.
• Excessive spring tension.
• Excessive voltage drop.
C. Motor pack fails to function.
• Check for correct voltage.
• Check for proper wiring.
Detail "A"
Adjustment Screws
Mounting Hardware
Wiring Diagram
Black
Black
Green
L1
L2
M
Motor Packs
MP-323 Voltages
Are 1-
ø
, 60 Hz
24
115
230
440
Speed (RPM)
1.8
1.8
1.8
1.8
Running Amps
1.4
0.22
0.12
0.065
Stall Amps
1.6
0.24
0.14
0.075
Identification #
2651 UL-2-2469 UL-3-2495 UL-4-2576
