Carrier 69NT40-561-019, Operation And Service Manual

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T-359 7–14
7.10.1 Replacing the Evaporator Fan Assembly
CAUTION
!
Always turn OFF the unit circuit breakers (CB-1 and CB-2) and disconnect main power supply
before working on moving parts.
a. Remove upper access panel (see Figure 3.2 ) by removing mounting bolts and TIR locking device. Reach
inside of unit and remove the Ty-Rap securing the wire harness loop. Disconnect the connector by twisting
to unlock and pulling to separate.
b. Loosen four 1/4-20 clamp bolts that are located on the underside of the fan deck at the sides of the fan
assembly. Slide the loosened clamps back from the fan assembly.
c. Slide the fan assembly out from the unit and place on a sturdy work surface.
7.10.2 Disassemble the Evaporator Fan Assembly
a. Attach a spanner wrench to the two 1/4-20 holes located in the fan hub. Loosen the 5/8-18 shaft nut by
holding the spanner wrench stationary and turning the 5/8-18 nut counter-clockwise (see Figure 7.8 ).
b. Remove the spanner wrench. Use a universal wheel puller and remove the fan from the shaft. Remove
the washers and key.
c. Remove the four 1/4-20 x 3/4 long bolts that are located under the fan that support the motor and stator
housing. Remove the motor and plastic spacer.
7.10.3 Assemble the Evaporator Fan Assembly
a. Assemble the motor and plastic spacer onto the stator.
NOTE
When removing the black nylon evaporator fan blade, care must be taken to assure that the blade is
not damaged. In the past, it was a common practice to insert a screwdriver between the fan blades to
keep it from turning. This practice can no longer be used, as the blade is made up of a material that
will be damaged. It is recommended that an impact wrench be used when removing the blade. Do not
use the impact wrench when reinstalling, as galling of the stainless steel shaft can occur.
b. Apply Loctite to the 1/4-20 x 3/4 long bolts and torque to 0.81 mkg (70 inch-pounds).
c. Place one 5/8 flat washer on the shoulder of the fan motor shaft. Insert the key in the keyway and
lubricate the fan motor shaft and threads with a graphite-oil solution (such as Never-seez).
d. Install the fan onto the motor shaft. Place one 5/8 flat washer with a 5/8-18 locknut onto the motor shaft
and torque to 40 foot-pounds.