Manual

INSTALLATION & OPERATION MANUAL

FFD, FFDR, FFDRA Models

Fan Filter Unit IOM

Installation & Operation

WARNING

DISCONNECT THE UNIT FROM THE ELECTRICAL

POWER SOURCE BEFORE ATTEMPTING

ANY SERVICE

Service: FFD and FFDR Motor Removal and Installation

Tools Required: Phillips Head Driver, Battery Operated Drill, (2) 8” adjustable wrenches, 10 mm hex head wrench,

#2 screwdriver, and slip joint pliers.

Step 1. To gain access to the motor, remove the ceiling panel next to the unit, if applicable.

Step 2. Switch the ON-OFF switch to the off position.

Step 3. Loosen the electrical box cover screws (2), and slide/lift off cover.

Step 4. Make note of all wire routing and locations for later reinstallation.

Step 5. Disconnect the two brown wires from the capacitor, using a pair of pliers. Disconnect the motor wiring from the rotary switch and rocker

switch or speed control and rocker switch and remove the grommet from the motor leads. Save this grommet for reinstallation.

Step 6. Remove the eight mounting screws to free the motor/blower assembly from the lid assembly. If using power drivers,

set the unit to a low torque setting to avoid stripping the sheet metal screws. Carefully remove housing assembly, paying

attention to wire routing.

Step 7. Using an adjustable wrench loosen the two set screws that attach the blower wheel to the motor shaft.

Step 8. Mark the location of the motor support bracket (belly band), then loosen the bolt just enough to allow the motor

support bracket to slid off the motor.

Step 9. Using the removed motor, mark the new motor with the location of the motor support bracket.

Step 10. Replace with the new motor and reassemble by reversing the above steps 1-8. Set the spacing at 0.25” (6.35 mm)

clearance between the blower and the upper motor plate/prefilter frame. This will give a 0.11” overlap between the venturi

ring and the blower.

WARNING

ELECTRICAL SERVICE SHOULD ONLY BE PERFORMED

BY A LICENSED OR QUALIFIED ELECTRICIAN

Motor/Electrical Removal

Prefilter

Motor

Venturi Ring

Blower Wheel

ON/OFF Switch

Power Entrance