10
I n s t a l l a t i o n , O p e r a t i o n , & M a i n t e n a n c e M a n u a l
MAC 10
®
LEAC2
Fan Filter Unit
■
Service: Standard Motor Removal and Installation from Above Ceiling
Tools Required:
Phillips head screwdriver, wire cutters to remove tie-down and install replacement tie-downs
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.
Remove the prefilter off the prefilter frame.
Step 4.
Loosen the electrical cover screws (two), and slide/lift off cover. (See Figure 9.1.)
Step 5.
Disconnect incoming power connections.
Step 6.
Using a low torque setting, remove challenge port tubing, if applicable. (See Figure 8.)
Step 7.
Remove the eight 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 (See Figure 9.1.)
Step 8.
Lift motor/blower assembly lid and turn upside down.
Step 9.
Disconnect motor wire harness connector from prefilter bracket.
Step 10.
Remove the four screws mounting the blower bracket to the blower assembly plate, and cut cable tie securing blower
cable to blower bracket. Remove motor mount assembly from plate.
Step 11.
Remove the four screws mounting the blower to the blower bracket. (Note orientation of blower cable to bracket.)
Step 12.
Install new motor/blower and components previously removed in reverse order to complete work. Don’t forget to
reinstall challenge port tubing, if applicable.
WARNING
DISCONNECT THE UNIT FROM THE ELECTRICAL
POWER SOURCE BEFORE ATTEMPTING
ANY SERVICE.
WARNING
ELECTRICAL SERVICE SHOULD ONLY
BE PERFORMED BY LICENSED ELECTRICIANS OR
AUTHORIZED ENVIRCO SERVICE TECHNICIANS.
PUSH-FIT BULKHEAD UNION
PREFILTER BRACKET
PRESS RING IN AND
PULL OUT ELBOW
(FFU ASSEMBLY SHOWN WITHOUT PREFILTER AND ELECTRICAL COVER)
Figure 8 - Motor Replacement
Figure 8: Challenge Port Detail
PREFILTER
ELECTRICAL COVER
COVER MOUNTING HARDWARE (2X)
PREFILTER BRACKET
VENTURI RING
MOTOR/BLOWER ASSEMBLY
PREFILTER BRACKET
HARDWARE (8X)
FILTER (STD)
FILTER PLENUM (RSRE - NOT SHOWN)
CONDUIT PLATE
Figure 9.1 - Motor Replacement
LID PANEL ASSEMBLY
MOTOR/BLOWER MOUNTING
BRACKET
Figure 9.1: Standard Motor Replacement
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