Envirco MAC 10 LE-AC - Manual (Page 11)

MAC 10 LE-AC SERVICE MANUAL
9
6 SERVICE: Removal and Installation of the Motor (Standard
and RSR models)
WARNING!
Disconnect the unit from the electrical power source before attempting any
service.
WARNING!
Electrical service should be performed by licensed electricians or authorized
ENVIRCO service technicians.
Tools Required: Phillips Head Driver
3/8” (10mm) Hex Head Wrench
Pliers
5/32”(0.40 cm) Allen wrench
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. (See Section II)
Step 4. Loosen the electrical box cover screws (2), and slide/lift off cover. (Figure 6)
Step 5. Make note of all wire locations for reinstallation later.
Step 6. Disconnect 5-pin and 16-pin wire harnesses from the electrical box housing.
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 6)
Step 8. Using an adjustable wrench loosen the two set screws that attach the blower
wheel to the motor shaft.
Step 9. 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 10. Using the removed motor, mark the new motor with the location of the motor
support bracket.
Step 11. 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
(Referenced by Figure 6 on page 11)