41
• Make sure wiring is within cabinet and will not interfere with access door. Make sure
there is proper separation between low voltage control wiring and field power wiring.
• Replace blower assembly control access panel before energizing equipment
.
7.6 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 motor terminals for DRAH1T. 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. The 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 screws holding the motor mounts to the blower side and remove motor
mount assembly from blower assembly.
• Remove the screw on the belly band strap around the motor shell and remove the 4
mounts from motor.
• Install (four) motor mounts and the belly band strap on the new motor using the
screws removed in the previous step.
• Insert the motor shaft through the hub in blower wheel and orient motor to original
position with motor leads and motor label facing the front of blower (control area).
• Reassemble 4 screws through motor mounts into blower side. Do not overtorque
screws.
• 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 orifice 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 motor terminals for DRAH1T making sure
that wires match wiring diagram and are tight and secure
.
7.7 BLOWER WHEEL REPLACEMENT
With the blower assembly removed and the motor assembly removed (see above
instructions), remove the screws holding the blower wrap (cutoff) to the blower sides.
• With wrap (cutoff) screws removed, cut off end of blower wrap will spring up. Lifting
wrap blower wheel is removed through the discharge opening in the blower housing.
• To replace, make sure wheel is oriented properly with hub to the opposite side from
the motor. Lift blower wrap and insert blower wheel through discharge opening in the
blower housing.
• Hold blower wrap down into position and replace screws holding blower wrap to blow-
er sides.
• See motor replacement and blower assembly instructions for remaining assembly
procedure.
7.8 REPLACEMENT PARTS
Any replacement part used to replace parts originally supplied on equipment must be
the same as or an approved alternate to the original part supplied. The manufacturer will
not be responsible for replacement parts not designed to physically fit or operate within
the design parameters the original parts were selected for.
These parts include but are not limited to: Circuit breakers, heater controls, heater limit
controls, heater elements, motor, motor capacitor, blower control, control transformer,
blower wheel, indoor coil and sheet metal parts.
When ordering replacement parts, it is necessary to order by part number and include
with the order the complete model number and serial number from the unit data plate.
(See Parts List for unit component part numbers).
