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®
Document Number 463545
MP-323 Motor Pack
Electric actuators with spring return for use
with WD-323 damper
Installation Instructions
MP-323 Motor Pack 1
®
Caution
Always disconnect, lock and tag power source before installing or servicing. Failure to disconnect power source
can result in fire, shock or serious injury.
Motor Pack Contents
1. Actuator
2. Actuator Bracket
3. Actuator Arm Assembly
4. Connecting Links
5. Actuator Spring
All necesary hardware included
Directions
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 actuator 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. Drill out the traced holes using a
3
⁄16 inch drill.
4. Mount the motor pack to the damper frame using
the 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 position
whil 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. Actuators are supplied with junction boxes and
covers. When wiring, make sure the supply voltage
agrees with the actuator voltage. On dual voltage
motro packds, be sure to connect the proper motor
leads for the correct voltage and insulate any
unused wires. The voltage of each specific modes is
indicated on a label that is affixed to the actuator (see
page 2 and 3 for typical wiring diagrams).
9. If the damper fails to operate 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
Detail "A"
Adjustment Screws
Mounting Hardware
Wiring Diagram
Black
Black
Green
L1
L2
M
MP-323 Motor Pack2
®
B. Motor pack fails to open the damper completey:
• 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
Actuator Specifications
MP-323 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.
Typcial 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 had the damper fully open before fan start-up.
Three Phase
Single Phase
Motor Packs 24V (50/60 Hz)
110 thru 120V
(50/60Hz)
208 thru 240V
(50/60 Hz)
460V (60Hz)
Stall Amps .66 .15 .07 .041
Spec ID# G24 G110-240 G-110-240 G460
Chart 1
* Actuator wiring diagrams on page 3.
Optional transformer for
277, 380, 575 or 600 volts
(120V actuator required)
Optional transformer for
277, 380, 575 or 600 volts
(120V actuator required)
Blue
24V Single Voltage Actuator
460V Single Voltage Actuator
White
Brown
Brown
110/115/120V Dual Voltage Actuators
Blue
208/220/230/240V Dual Voltage Actuators
Optional transformer for
277, 380, 575 or 600 volts
(120V actuator required)
Optional transformer for
277, 380, 575 or 600 volts
(120V actuator required)
Blue
24V Single Voltage Actuator
460V Single Voltage Actuator
White
Brown
Brown
110/115/120V Dual Voltage Actuators
Blue
208/220/230/240V Dual Voltage Actuators
Optional transformer for
277, 380, 575 or 600 volts
(120V actuator required)
Optional transformer for
277, 380, 575 or 600 volts
(120V actuator required)
Blue
24V Single Voltage Actuator
460V Single Voltage Actuator
White
Brown
Brown
110/115/120V Dual Voltage Actuators
Blue
208/220/230/240V Dual Voltage Actuators
Optional transformer for
277, 380, 575 or 600 volts
(120V actuator required)
Optional transformer for
277, 380, 575 or 600 volts
(120V actuator required)
Blue
24V Single Voltage Actuator
460V Single Voltage Actuator
White
Brown
Brown
110/115/120V Dual Voltage Actuators
Blue
208/220/230/240V Dual Voltage Actuators
MP-323 Motor Pack 3
®
Optional transformer for
277, 380, 575 or 600 volts
(120V actuator required)
Optional transformer for
277, 380, 575 or 600 volts
(120V actuator required)
Blue
24V Single Voltage Actuator
460V Single Voltage Actuator
White
Brown
Brown
110/115/120V Dual Voltage Actuators
Blue
208/220/230/240V Dual Voltage Actuators
Optional transformer for
277, 380, 575 or 600 volts
(120V actuator required)
Optional transformer for
277, 380, 575 or 600 volts
(120V actuator required)
Blue
24V Single Voltage Actuator
460V Single Voltage Actuator
White
Brown
Brown
110/115/120V Dual Voltage Actuators
Blue
208/220/230/240V Dual Voltage Actuators
Actuator Wiring Diagrams
Transformers
575/600 Volt Transformer Model
B050WZ13
208/220/277/460 Volt Transformer
463545 • MP-323 Motor Pack Rev. 4 August 2016 Copyright 2016 © Greenheck Fan Corporation4
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications
without notice.
Specific Greenheck product warranties are located on greenheck.com within the product area tabs and in the
Library under Warranties.
®
Phone: 715.359.6171 • Fax: 715.355.2399 • Parts: 800.355.5354 • E-mail: [email protected] • Website: www.greenheck.com
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