Carrier 69NT40-561-300, Operation And Service Manual

Page: 134 / 174

T-365 7–18
7.14.1 Replacing the Evaporator Fan Assembly
WARNING
!
Always turn OFF the unit circuit breakers (CB-1 & CB-2) and disconnect main power supply
before working on moving parts.
1. Remove access panel 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.
2. 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.
3. Slide the fan assembly out from the unit and place on a sturdy work surface.
7.14.2 Disassemble the Evaporator Fan Assembly
1. Attach a spanner wrench to the two 1/4-20 holes located in the fan hub. Loosen the 5/8-18 shaft nut by hold-
ing the spanner wrench stationary and turning the 5/8-18 nut counter-clockwise (see Figure 7.14 ).
2. Remove the spanner wrench. Use a universal wheel puller and remove the fan from the shaft. Remove the
washers and key.
3. 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.
7.14.3 Assemble the Evaporator Fan Assembly
1. Assemble the motor and plastic spacer onto the stator.
NOTICE
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.
2. Apply Loctite to the 1/4-20 x 3/4 long bolts and torque to 0.81 mkg (70 inch-pounds).
3. 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).
4. 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.
Figure 7.14 Evaporator Fan Assembly
Nut
Screws, Washers
Protector
Motor
Washer
Fan
Stator