Greenheck MP-100A User Manual

Document #463548

®®

Installation Instructions

Motor Pack Contents

1. Actuator

2. Actuator Bracket

3. Actuator Arm Assembly

4. Connecting Links

5. Actuator Spring

6. 1/4-20 Screws and Nuts

7. #10 Screws and Nuts All necessary hardware included

1. The MP-100A motor pack is designed for installation

on model WD-100 series backdraft dampers only. When properly installed, the damper will be horizontally mounted (air ﬂow up) and the motor pack will be above the damper.

2. Attach connecting link(s) to the damper link using the #10 hardware along with the bronze bushing(s) (see Detail B). Use position “A” on most applications. Position “B” can be used on larger dampers when a negative pressure is present. The damper blades can be lifted to the open position to provide easier access when attaching the connecting link(s) to the damper link. Tighten all fasteners. Note: Check that the connecting links are over the bushing(s) and not pinched between the end of the bushing and the screw or damper link. As the blades are being closed, the linkage bolt that is used to attach the connecting link to the damper link may interfere with the damper blade bearing rail, causing the blades to remain slightly open. To resolve this interference issue, using pliers, bend that area of the damper blade bearing rail away from the bolt head until sufﬁcient clearance is provided.

3. Attach the motor pack assembly to the damper frame with the 1/4 in. hardware provided. Assemble the connecting link(s) to the actuator arm assembly using the #10 hardware. The damper blades should be closed during this connection. The angle between the connecting links and the actuator arm should be as shown in Detail C with a slight tension on the spring. Tighten the fasteners between the connecting link and the actuator arm assembly. Fasteners should be placed as far apart as possible. This will provide greater stability to the linkage. Operate the damper manually. Verify that the linkage fasteners do not interfere with any components of the assembly and that the damper blades close completely when released.

Note: The spring can be adjusted to provide more

or less closing force. It is important not to use too

MP-100A Motor Pack

UL listed electric actuators with spring return

for use with WD-100 series dampers

much spring tension; use just enough to help close the damper. Too much tension could impair damper opening.

To adjust the spring, unhook the spring from the

actuator bracket and reattach to the next hole that provide more or less tension.

4. Actuators are supplied with junction boxes 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).

5. If the damper fails to operate 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 the actuator fails to function:

• Check for correct voltage

• Check for proper wiring

Motor Pack Quantity

Optional transformer for 277, 380, 575 or 600 volts (120V actuator required)

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 double panel view.

Actuator Speciﬁcations

MP-100A 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 will be required.

Chart 1

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

* Actuator wiring diagrams on page 3.

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

Optional transformer for 277, 380, 575 or 600 volts (120V actuator required)

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