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DANGER
NEVER enter an enclosed fan cabinet or reach
into a unit while the fan is running.
LOCK OPEN AND TAG the fan motor power dis-
connect switch before working on a fan. Take fus-
es with you and note removal on tag. Electric
shock can cause personal injury or death.
LOCK OPEN AND TAG the electric heat coil pow-
er disconnect switch before working on or near
heaters.
Failure to follow these warnings could lead to per-
sonal injury or death.
SERVICE
General
1. Review Safety Considerations at beginning of
these instructions. Good safety habits are im-
portant tools when performing service proce-
dures.
2. To make speed measurements, use a laser-style
tachometer.
Fan Motor Replacement
WARNING: Shut off motor power and lock out power
supply.
Remove Blower/Motor Assembly
Procedure:
1. Disconnect wiring harness plugs from motor (Fig.
16 and 17).
2. Remove blower mounting bolts, which secure the
blower rails upward against the blower deck
(2ea).
3. Remove motor/wheel assembly from the MMD
unit by sliding out (Figure 18).
4. See Figure 19. Loosen shaft set screw (opposite
motor side) and motor mount tightening screw
until motor can be removed.
5. Remove motor. Install new motor (Fig. 20), tight-
en motor mount bolt, then locate fan wheel and
tighten shaft set screw.
6. Reverse steps 1-4 to reinstall fan. Make sure
that the two clips at the back hold the blower rails
up against the blower deck.
7. Spin fan by hand to make sure there is no rub-
bing or interference.
8. Close unit access doors, remove lockout/tag out
and restore the unit to operation.
035-000051-001
Page 22 of 60
MOTOR
HARNESS &
CONNECTORS
Figure 16
MOTOR
HARNESS &
CONNECTORS
Figure 17
MMD IOM 1.2 11-10-2020
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