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After extended use, removal of the blower assembly may become necessary for a thor-
ough cleaning of the blower motor and wheel.
• Mark field power supply wiring (for replacement) attached to terminal block or circuit
breaker(s) on blower assembly. Remove wiring from terminal block or circuit break-
er(s).
• Mark low voltage control wiring (for replacement) where attached to unit control pig-
tails on right side of blower housing. Remove wire nuts attaching field control wiring to
unit control pigtails.
• Remove 4 screws holding blower assembly to front channel of cabinet and pull blower
assembly from cabinet.
• To replace blower assembly, slide blower assembly into blower deck. Make sure
blower assembly engages lances in deck properly. If assembly hangs up, check to
make sure top and bottom are lined up in proper locations.
• Slide blower assembly to back of cabinet and make sure it is completely engaged.
• Replace 4 screws holding blower assembly to front channel of cabinet. Take care not
to strip screws, just snug into place.
• Replace low voltage control wiring with wire nuts and make sure wiring is to wiring
diagram and a good connection has been made.
• Replace field power wiring to terminal block or circuit breaker(s) on control area of
blower assembly. Make sure wires are replaced as they were, check wiring diagram if
necessary. Tighten supply power wiring securely to terminals lugs.
• Make sure wiring is within cabinet and will not interfere with access door. Make sure
proper separation between low voltage control wiring and field power wiring has been
maintained.
• Replace blower assembly control access panel before energizing equipment.
12.6 MOTOR REPLACEMENT
With the blower assembly removed, the indoor blower motor can be removed and
replaced using the following procedure:
• Remove motor leads from the motor capacitor and blower relay. Note lead locations
for ease of reassembly. Pull leads from plastic bushing in blower side.
• Loosen the set screw holding blower wheel onto the motor shaft. Shaft extends
through blower hub so that a wrench can be used on the extended shaft to break the
shaft loose if necessary. Be careful not to damage shaft. A wheel puller can be used
on the groove in the blower hub if necessary.
• Remove 4 metal screws holding motor mounts to blower side and remove motor from
blower assembly.
• To install new motor, remove 1 screw holding motor mounts to motor shell and
remove mounts (four) from motor.
WARNING
To avoid electrical shock which can result in personal injury or death, use only
the screws furnished in the motor shell mounting holds. Screws are #8-18 x
.25 in. long blunt nose thread forming. Screws longer than 1/4 in. may contact
the motor winding.
• Install (four) motor mounts to motor using same screw or screws supplied with
replacement motor.
• To reassemble, insert motor shaft through hub in blower wheel and orient motor to
original position with motor leads and motor label to front of blower (control area).
• Reassemble 12 sheet metal screws through motor mounts into blower side. Do not
overtorque screws, blower side is light gage sheet metal, just snug screws tight
enough to hold motor mounts in position.
• Turn motor shaft so that flat on shaft is located under blower wheel setscrew, and
blower wheel is centered in blower housing with the same distance on each side
between the inlet venturi and outside of blower wheel. Tighten setscrew on motor
shaft. Turn wheel by hand to make sure it runs true without hitting blower sides.
• Reassemble motor wiring to capacitor and blower relay making sure that wires match
wiring diagram and are tight and secure.
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